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1

Studies of cell separation: a comparison of the osmotic response of human lymphocytes and granulocyte-monocyte progenitor cells.  

PubMed

The feasibility of using hypo- or hypertonic stress to selectively destroy lymphocytes while sparing stem cells was investigated. Lymphocytes were isolated from peripheral blood and exposed to Hanks' balanced salt solutions ranging in concentration from 66 to 2700 mOsm. The Boyle-van't Hoff plot of cell volume versus reciprocal osmolality was linear. Following osmotic stress, viabilities of the lymphocytes and the granulocyte-monocyte progenitor cells (CFUc) were determined. Lymphocyte viability was assessed by tritiated thymidine incorporation following mitogen stimulation. CFUc viability was measured with the soft agar colony assay. Both types of cells were found to possess high osmotic tolerances compared to other blood cells. While progenitor cells in general appeared to survive anisotonic exposure somewhat better than lymphocytes, significant statistical differences were not established for most situations. The highest degree of CFUc enrichment was twofold, but there was a concomitant 50% drop in CFUc survival. These results suggest that osmotic stress is not a useful procedure for the separation of peripheral blood lymphocytes and stem cells. PMID:6661913

Law, P; Alsop, P; Dooley, D C; Meryman, H T

1983-12-01

2

Impaired T lymphocyte colony formation in infectious mononucleosis: evidence for both monocyte and lymphocyte defects.  

PubMed Central

PHA-induced T lymphocyte colony formation in semi-solid agar culture was studied in mononuclear cells (MC) and non-adherent cells (NAC) from the blood of patients with infectious mononucleosis (IM). Colony formation expressed as number of colonies per 10(6) E-RFC or as number of colonies per ml of blood was depressed by about 90% during the first weeks of disease, but returned to normal levels during the convalescence period. Addition to the agar culture of conditioned medium prepared from adherent blood MC or normal donors partly restored colony formation by both MC andNAC from patients with IM in the acute stages, suggesting a subnormal production of conditioning factors by cocultured adherent cells. In line with this finding adherent cells from patients with acute disease failed to produce a conditioned medium which optimally supported the growth of T lymphocyte colonies from NAC of normal donors. When mononuclear cells from patients with IM were mixed with normal donor lymphocytes prior to agar seeding, colony formation by the normal cells was reduced by 10--65%. It is concluded that mononuclear cells from patients with IM have a reduced capacity to form T lymphocyte colonies in agar medium. This reduction possibly reflects a lack of production of colony stimulating factors from monocytes, but also increased activity of T lymphocyte colony suppressor cells. PMID:317032

Claësson, M H; Andersen, V

1979-01-01

3

The monocytic population in chronic lymphocytic leukemia shows altered composition and deregulation of genes involved in phagocytosis and inflammation.  

PubMed

Macrophages reside in tissues infiltrated by chronic lymphocytic leukemia B cells and the extent of infiltration is associated with adverse prognostic factors. We studied blood monocyte population by flow cytometry and whole-genome microarrays. A mixed lymphocyte reaction was performed to evaluate proliferation of T cells in contact with monocytes from patients and normal donors. Migration and gene modulation in normal monocytes cultured with CLL cells were also evaluated. The absolute number of monocytes increased in chronic lymphocytic leukemia patients compared to the number in normal controls (792 ± 86 cells/?L versus 485 ± 46 cells/?L, P=0.003). Higher numbers of non-classical CD14(+)CD16(++) and Tie-2-expressing monocytes were also detected in patients. Furthermore, we performed a gene expression analysis of monocytes in chronic lymphocytic leukemia patients, showing up-regulation of RAP1GAP and down-regulation of tubulins and CDC42EP3, which would be expected to result in impairment of phagocytosis. We also detected gene alterations such as down-regulation of PTGR2, a reductase able to inactivate prostaglandin E2, indicating immunosuppressive activity. Accordingly, the proliferation of T cells in contact with monocytes from patients was inhibited compared to that of cells in contact with monocytes from normal controls. Finally, normal monocytes in vitro increased migration and up-regulated CD16, RAP1GAP, IL-10, IL-8, MMP9 and down-regulated PTGR2 in response to leukemic cells or conditioned media. In conclusion, altered composition and deregulation of genes involved in phagocytosis and inflammation were found in blood monocytes obtained from chronic lymphocytic leukemia patients, suggesting that leukemia-mediated "education" of immune elements may also include the establishment of a skewed phenotype in the monocyte/macrophage population. PMID:23349302

Maffei, Rossana; Bulgarelli, Jenny; Fiorcari, Stefania; Bertoncelli, Linda; Martinelli, Silvia; Guarnotta, Carla; Castelli, Ilaria; Deaglio, Silvia; Debbia, Giulia; De Biasi, Sara; Bonacorsi, Goretta; Zucchini, Patrizia; Narni, Franco; Tripodo, Claudio; Luppi, Mario; Cossarizza, Andrea; Marasca, Roberto

2013-07-01

4

Proinflammatory profile of in vitro monocytes in the ageing is affected by lymphocytes presence  

PubMed Central

Background Aging is associated with complex and constant remodeling of the immune function, resulting in an increasing susceptibility to infection and others diseases. The infections caused by Gram-negative microorganisms, present in nursing homes and hospitals, constitute one of the most common infections in the elderly, and are mainly combated by innate immune cells. Although the functions of innate immunity seem more preserved during aging than of adaptive immune mechanisms, two systems operate in an integrated way in the body, so that injury in one part of the immune system inevitably affects the other as they are part of a defensive network. The aim of this study was to investigate the in vitro production of proinflammatory (TNF-?, IL-6, IL-1?, CXCL-8 and MCP-1) and anti-inflammatory (TGF-? and IL-10) cytokines by monocytes, stimulated or not (basal) with lipopolysaccharide, from healthy young and elderly subjects. By means of PBMCs, we also studied if cytokine profile is altered in these different patient groups, in the presence of lymphocytes, under the same experimental conditions. Results The monocytes from elderly presented higher basal production of TNF-?, MCP-1 and lower of TGF-? than young monocytes. PBMC showed similar cytokines production, irrespective age or stimulation presence. In the presence of lymphocytes, the spontaneous production of IL-10 was higher and of TGF-? was lower than monocytes, regardless of age. After LPS-stimulation, the presence of lymphocytes resulted in increased IL-6, IL-1?, MCP-1 and IL-10 and decreased CXCL-8 and TGF-? in comparison to pure culture of monocytes from young patients. With age, the same differences were observed, except for CXCL-8 and TGF-? which production was the same between monocytes and PBMC stimulated with LPS. Conclusion These findings reinforce the systemic state of inflamm-aging frequently reported in elderly and considered a factor of susceptibility to numerous diseases. Still, the cytokine production from just monocytes of the elderly showed alterations, while in the lymphocyte presence not, suggesting an immunomodulator role of lymphocytes on monocytes. In addition, the differences between the production patterns by LPS-stimulated PBMC between young and elderly volunteers can be related with an imbalance in response against Gram-negative bacteria in throughout life. PMID:23758797

2013-01-01

5

Peripheral blood monocyte-to-lymphocyte ratio at study enrollment predicts efficacy of the RTS,S malaria vaccine: analysis of pooled phase II clinical trial data  

PubMed Central

Background RTS,S is the most advanced candidate malaria vaccine but it is only partially protective and the causes of inter-individual variation in efficacy are poorly understood. Here, we investigated whether peripheral blood monocyte-to-lymphocyte ratios (ML ratio), previously shown to correlate with clinical malaria risk, could account for differences in RTS,S efficacy among phase II trial participants in Africa. Methods Of 11 geographical sites where RTS,S has been evaluated, pre-vaccination ML ratios were only available for trial participants in Kilifi, Kenya (N?=?421) and Lambarene, Gabon (N?=?189). Using time to first clinical malaria episode as the primary endpoint we evaluated the effect of accounting for ML ratio on RTS,S vaccine efficacy against clinical malaria by Cox regression modeling. Results The unadjusted efficacy of RTS,S in this combined dataset was 47% (95% confidence interval (CI) 26% to 62%, P <0.001). However, RTS,S efficacy decreased with increasing ML ratio, ranging from 67% (95% CI 64% to 70%) at an ML ratio of 0.1 to 5% (95% CI -3% to 13%) at an ML ratio of 0.6. The statistical interaction between RTS,S vaccination and ML ratio was still evident after adjustment for covariates associated with clinical malaria risk in this dataset. Conclusion The results suggest that stratification of study participants by ML ratio, easily measured from full differential blood counts before vaccination, might help identify children who are highly protected and those that are refractory to protection with the RTS,S vaccine. Identifying causes of low vaccine efficacy among individuals with high ML ratio could inform strategies to improve overall RTS,S vaccine efficacy. Trial registration ClinicalTrials.Gov numbers NCT00380393 and NCT00436007 PMID:23962071

2013-01-01

6

Lymphocytes stimulate expression of 5-lipoxygenase and its activating protein in monocytes in vitro via granulocyte macrophage colony-stimulating factor and interleukin 3.  

PubMed Central

The aim of this study was to examine the role of lymphocytes in regulating expression of the 5-lipoxygenase pathway in monocytes. When monocytes were cultured over a period of days with lymphocytes, calcium ionophore-stimulated 5-lipoxygenase activity was enhanced. If lymphocytes alone were activated with lectins and their supernatants added to monocytes, stimulated 5-lipoxygenase activity was increased, whereas supernatants from lymphocytes cultured without lectins had no effect. Increased immunoreactive protein and mRNA for 5-lipoxygenase and 5-lipoxygenase activating protein were present in cells conditioned with lectin-activated lymphocyte supernatants. The effect of activated-lymphocyte supernatants could be mimicked by either GM-CSF or IL-3, but there was no additive effect with both cytokines. Both GM-CSF and IL-3 were present in the supernatant from lectin-activated lymphocytes at concentrations above their ED50, but were undetectable in the supernatant from nonactivated lymphocytes. The effect of lectin-activated lymphocyte supernatant could be inhibited by neutralizing antibodies to both cytokines, but not to either cytokine alone. We conclude that lymphocytes can regulate the expression of 5-lipoxygenase in monocytes, over a period of days, via the release of soluble factors, primarily GM-CSF and IL-3. PMID:8636442

Ring, W L; Riddick, C A; Baker, J R; Munafo, D A; Bigby, T D

1996-01-01

7

Monocyte factors modulate in vitro T-lymphocyte mitogenesis in protein malnutrition.  

PubMed Central

This study investigated changes in T-lymphocyte mitogenesis and immunoregulatory cytokines during protein malnutrition. In vitro T cell response to concanavalin A was compared among protein deprived (PD), energy restricted pair fed control (PF), and ad libitum control (C) rabbits. Cell cultures were supplemented with crude monocyte supernatants (CMS) from PD, PF or C animals at either 1% or 8% final concentration in culture. Prostaglandin E2 (PGE2) concentration of unstimulated or stimulated lymphocyte culture supernatants and CMS was determined. Lymphocyte cultures from PD, PF and C animals had enhanced 3H-thymidine incorporation when supplemented with C and/or PF derived CMS. Addition of 8% CMS from PD rabbits inhibited proliferation below levels observed in mitogen-only stimulated groups in all cultures. At the 1% concentration, inhibition was seen in PD and C derived cells cultures and modest enhancement was seen in PF cultures. PGE2 concentration in supernatants from stimulated and unstimulated lymphocyte cultures from PD rabbits were higher than in C and PF cell cultures. These results suggest (a) that under appropriate culture conditions lymphocytes from PD donors are capable of enhanced proliferation and (b) that depressed T cell mitogenesis observed in protein malnutrition may reflect alterations in immunoregulatory signals. The role of interleukin 1 (IL-1) and PGE2 in the modulation of this response is discussed. PMID:3485484

Bell, R C; Hoffman-Goetz, L; Keir, R

1986-01-01

8

GST-M1 is transcribed moreso than AKR7A2 in AFB1-exposed human monocytes and lymphocytes.  

PubMed

Abstract Glutathione-S-transferases (GST) and aldo-keto reductases (AKR) are key aflatoxin (AF)-detoxifying enzymes. In this study, the expression of GST-M1, GST-T1, AKR-7A2, and AKR-7A3 genes in human monocytes and lymphocytes was analyzed after in vitro exposure to 10 or 100?ng AFB1/ml for 2?h. Unlike in pilot studies that showed that all four examined genes were present in HepG2 cells, in lymphocytes and monocytes, only GST-M1 and AKR-7A2 were detected. In fact, the induced expression of both GST-M1 and AKR-7A2 genes in human monocytes was moreso than that seen in AFB1-exposed lymphocytes. In addition, analyses of the effects of the exposures on cell cycle status were performed as, in cells lacking adequate detoxification capacities, it would be expected the cells would arrest at checkpoints in the cell cycle or progress to apoptotic/necrotic states. The results here indicated that only the high dose of AFB1 led to a change in cell cycle profiles and only in the monocytes (i.e. cells in S phase were significantly reduced). In general, the results here strongly suggest that human immune cell lineages appear to be able to increase their expression of AFB1-detoxifying enzymes (albeit to differing degrees) and, as a result, are able to counter potential toxicities from AFB1 and (likely) its metabolites. PMID:25027672

Bahari, Abbas; Mehrzad, Jalil; Mahmoudi, Mahmoud; Bassami, Mohammad Reza; Dehghani, Hesam

2015-04-01

9

Impaired Cell-Mediated Immunity in Hodgkin's Disease Mediated by Suppressor Lymphocytes and Monocytes  

PubMed Central

In Hodgkin's disease a possible mechanism for impaired cellular immunity is cell-mediated suppression, defined as the inhibitory interaction between suppressor cells and effector lymphocytes. To test for the presence of suppressor cells in peripheral blood, we have modified the standard, one-way mixed lymphocyte culture by adding mitomycin C-treated mononuclear cells from the responder. Suppression, expressed as a percent of the base-line mixed lymphocyte culture in which these extra cells are not present, results in a reduction of thymidine incorporated in the modified culture (i.e., 100% suppression = no net thymidine incorporation; 0% suppression = identical thymidine incorporation in both the modified and baseline culture). Suppression was found to be significantly increased in patients with both active Hodgkin's disease (78±4.6%) and remission Hodgkin's disease (58±9.3%) compared to normal individuals (21±6.9%) (mean±SE). The degree and frequency of suppression were not influenced by disease stage or prior therapy. Cell purification techniques revealed (in 10 patients studied) the suppressor cell to be a monocyte in 6, and a thymus-derived lymphocyte in 4. Possible genetic restriction of the suppressor cell interaction was indicated by a failure of suppressor cells to alter the response of lymphocytes from unrelated individuals, but suppression was obtained with lymphocytes from a histocompatible sibling. Although mononuclear cells from normal individuals suppress less frequently than cells from patients with Hodgkin's disease, normals may demonstrate suppression comparable to that observed in Hodgkin's patients. This finding suggests that suppression is a normal immunoregulatory mechanism which is altered in Hodgkin's disease. PMID:149140

Hillinger, Stephen M.; Herzig, Geoffrey P.

1978-01-01

10

Differential down-regulation of CD95 or CD95L in chronically HIV-infected cells of monocytic or lymphocytic origin: cellular studies and molecular analysis by quantitative competitive RT-PCR.  

PubMed

We analysed the expression of CD95/CD95L in two widely used models for studying the cellular effects of chronic infection with human immunodeficiency virus type 1 (HIV-1), i.e. ACH-2 cells, derived from the lymphocytic cell line A301, and U1, derived from monocytic U937 cells. A301 and ACH-2 mounted the same amount of plasma membrane CD95, while U1 had a consistent decrease in CD95 expression. Using different antibodies, we failed to detect the plasma membrane form of its ligand, CD95L, but we could see the intracellular presence of that molecule in A301 cells and, to a lesser extent, in ACH-2 cells, but not in U937 or U1 cells. To confirm the cytofluorimetric data and quantify the expression of CD95L at the RNA level, we developed a quantitative competitive RT-PCR assay. The HUT78 cell line had about 50,000 copies mRNA/1000 cells, three times more after induction with a phorbol ester and ionomycin. ACH-2 expressed about 400- (basal) or 10- (induced) fold less CD95L mRNA than the parental cell line A301; U937 and U1 were below the limit of detection. In cells of lymphoid origin (ACH-2) chronic HIV infection inhibits the expression of CD95L, the phenomenon occurring at the transcriptional level. In cells of monocytic origin (U1) the infection decreases the plasma membrane expression of CD95. This suggests that HIV could trigger different anti-apoptotic strategies which likely depend upon the cell line which is infected. In monocytic cells which act as a viral reservoir, the expression of the molecule whose binding triggers apoptosis decreases, while in lymphoid cells, capable of exerting cytotoxicity, the expression of a molecule which induces apoptosis is reduced. PMID:10481067

Pinti, M; Pedrazzi, J; Benatti, F; Sorrentino, V; Nuzzo, C; Cavazzuti, V; Biswas, P; Petrusca, D N; Mussini, C; De Rienzo, B; Cossarizza, A

1999-09-17

11

B lymphocytes trigger monocyte mobilization and impair heart function after acute myocardial infarction.  

PubMed

Acute myocardial infarction is a severe ischemic disease responsible for heart failure and sudden death. Here, we show that after acute myocardial infarction in mice, mature B lymphocytes selectively produce Ccl7 and induce Ly6C(hi) monocyte mobilization and recruitment to the heart, leading to enhanced tissue injury and deterioration of myocardial function. Genetic (Baff receptor deficiency) or antibody-mediated (CD20- or Baff-specific antibody) depletion of mature B lymphocytes impeded Ccl7 production and monocyte mobilization, limited myocardial injury and improved heart function. These effects were recapitulated in mice with B cell-selective Ccl7 deficiency. We also show that high circulating concentrations of CCL7 and BAFF in patients with acute myocardial infarction predict increased risk of death or recurrent myocardial infarction. This work identifies a crucial interaction between mature B lymphocytes and monocytes after acute myocardial ischemia and identifies new therapeutic targets for acute myocardial infarction. PMID:24037091

Zouggari, Yasmine; Ait-Oufella, Hafid; Bonnin, Philippe; Simon, Tabassome; Sage, Andrew P; Guérin, Coralie; Vilar, José; Caligiuri, Giuseppina; Tsiantoulas, Dimitrios; Laurans, Ludivine; Dumeau, Edouard; Kotti, Salma; Bruneval, Patrick; Charo, Israel F; Binder, Christoph J; Danchin, Nicolas; Tedgui, Alain; Tedder, Thomas F; Silvestre, Jean-Sébastien; Mallat, Ziad

2013-10-01

12

B lymphocytes trigger monocyte mobilization and impair heart function after acute myocardial infarction  

PubMed Central

Acute myocardial infarction is a severe ischemic disease responsible for heart failure and sudden death. Here, we show that after acute myocardial infarction in mice, mature B lymphocytes selectively produce Ccl7 and induce Ly6Chi monocyte mobilization and recruitment to the heart, leading to enhanced tissue injury and deterioration of myocardial function. Genetic (Baff receptor deficiency) or antibody-mediated (CD20- or Baff-specific antibody) depletion of mature B lymphocytes impeded Ccl7 production and monocyte mobilization, limited myocardial injury and improved heart function. These effects were recapitulated in mice with B cell–selective Ccl7 deficiency. We also show that high circulating concentrations of CCL7 and BAFF in patients with acute myocardial infarction predict increased risk of death or recurrent myocardial infarction. This work identifies a crucial interaction between mature B lymphocytes and monocytes after acute myocardial ischemia and identifies new therapeutic targets for acute myocardial infarction. PMID:24037091

Zouggari, Yasmine; Ait-Oufella, Hafid; Bonnin, Philippe; Simon, Tabassome; Sage, Andrew P; Guérin, Coralie; Vilar, José; Caligiuri, Giuseppina; Tsiantoulas, Dimitrios; Laurans, Ludivine; Dumeau, Edouard; Kotti, Salma; Bruneval, Patrick; Charo, Israel F; Binder, Christoph J; Danchin, Nicolas; Tedgui, Alain; Tedder, Thomas F; Silvestre, Jean-Sébastien; Mallat, Ziad

2014-01-01

13

Peripheral blood lymphocyte and monocyte recovery and survival in acute leukemia postmyeloablative allogeneic hematopoietic stem cell transplant.  

PubMed

Many previous studies of immune reconstitution (IR) postallogeneic hematopoietic stem cell transplantation (HSCT) have focused on lymphocyte recovery. Recognizing that IR involves complex interactions between innate and adaptive immune networks, we hypothesized that patterns of both monocyte and lymphocyte recovery could provide additional prognostic information. To test our hypothesis, we analyzed data from 135 consecutive patients undergoing myeloablative allogeneic HSCT for acute myeloid (AML) and lymphoblastic leukemia (ALL) from 2001 to 2010. The absolute lymphocyte and monocyte counts (ALC and AMC, respectively) were determined longitudinally at days +15, +30, +60, and +100, and correlated with clinical outcomes. At the day +30 time point, both ALC and AMC >0.3 × 10(9) cells/L were strongly associated with improved survival (overall survival [OS] 29.6 months versus 5.4 months, P = .006 and 25.3 months versus 5.1 months, P = .01 respectively), a pattern that generally continued through the day +100 evaluation. Multivariate analysis revealed the following independent prognostic factors: early disease status at transplantation, the development of chronic GVHD, the day +30 AMC, day +100 AMC, and day +100 ALC. To further explore whether any inherent patterns in the timing of lymphocyte and monocyte recovery had prognostic value post-HSCT, we performed unsupervised hierarchical clustering on the longitudinal hematopoietic parameters studied in this cohort. Four clusters of patients were identified: clusters A-D. Patient clusters B and D both demonstrated improved ALC and AMC recovery at the day +60 and day +100 time points and had significantly improved OS compared with clusters A and C (57.8 months versus 19.7 and 4.4 months, respectively, P < .001). Our data suggest that patients with poor lymphocyte and monocyte recovery beyond the day +60 time points may be at risk for poorer outcomes, and that further investigation into lymphoid/myeloid interactions in developing individualized immunotherapy is warranted. PMID:21843495

Thoma, Mary D; Huneke, Tanya J; DeCook, Lori J; Johnson, Nicci D; Wiegand, Rob A; Litzow, Mark R; Hogan, William J; Porrata, Luis F; Holtan, Shernan G

2012-04-01

14

Infused autograft lymphocyte to monocyte ratio predicts survival in classical Hodgkin lymphoma  

PubMed Central

The infused autograft lymphocyte to monocyte ratio (A-LMR) as a surrogate marker of host immunity (ie, absolute lymphocyte count) and CD14+ HLA-DRlow/neg immunosuppressive monocytes (ie, absolute monocyte count) is a prognostic factor for patients with diffuse large B-cell lymphoma after autologous peripheral hematopoietic stem cell transplantation (APHSCT). Thus, we set out to investigate if A-LMR can also affect survival post-APHSCT in classical Hodgkin lymphoma. From 1994 to 2012, 183 patients with classical Hodgkin lymphoma who underwent APHSCT were studied. The patients were randomly divided into a training set (n=122) and a validation set (n=61). The receiver operating characteristic and area under the curve identified an A-LMR ?1 as the best cut-off value and validated by the k-fold cross-validation in the training set. Multivariate analysis showed A-LMR to be an independent prognostic factor for survival in the training set. Patients with an A-LMR ?1.0 experienced a superior overall survival (OS) versus patients with an A-LMR <1.0 (median OS not reached versus 40.4 months, 5-year OS rates of 86% [95% CI 72–93] versus 43% [95% CI 28–58], P<0.0001, respectively) in the training set. In the validation set, an A-LMR ?1 showed a median OS of not reached versus 41.4 months for an A-LMR <1, 5-year OS rates of 90% (95% CI 73–97) versus 48% (95% CI 28–68; P<0.0001). A-LMR provides a platform to engineer an autograft versus tumor effect to improve clinical outcomes in patients with classical Hodgkin lymphoma undergoing APHSCT. PMID:25674021

Porrata, Luis F; Inwards, David J; Ansell, Stephen M; Micallef, Ivana N; Johnston, Patrick B; Hogan, William J; Markovic, Svetomir N

2015-01-01

15

Prostaglandin E inhibition of T-lymphocyte colony formation: a possible mechanism of monocyte modulation of clonal expansion.  

PubMed Central

Prostaglandin and monocyte modulation of a T-lymphocyte cell capable of undergoing clonal expansion was studied. Circulating human mononuclear cells were isolated by density centrifugation. After 24 h in culture with phytohemagglutinin present, the cells were mixed with 0.3% agar and overlayed onto a 0.5% agar layer that contained media and phytohemagglutinin. At day 6, colonies that contained greater than 50 cells were counted. These colonies represented clonal prolifertion of a phytohemagglutinin-responsive T-lymphocyte precursor. This responder cell accounted for less than 0.3% of the starting cell population. Colonies were comprised of cells which, when isolated, formed E rosettes. These colony cells could be shown to have helper or suppressor function as measured by their ability to promote or inhibit immunoglobulin synthesis. By these latter criteria the colony cells were considered to be mature T lymphocytes. The addition of prostaglandin E to the cultures demonstrated a linear, r = 0.82, dose-dependent inhibition of colony formation with a 50% point of inhibition (I50) = 0.18 muM. Low numbers of normal monocytes when added to the cultures mimicked the effect of synthetic prostaglandin E2. A highly significant correlation could be shown for endogenous prostaglandin E levels and colony counts. It appears that monocytes through their synthesis of prostaglandin E2 can restrict the clonal expansion of a circulating T-lymphocyte precursor. Images PMID:313939

Bockman, R S; Rothschild, M

1979-01-01

16

Anti-ganglioside GM2 monoclonal antibody-dependent killing of human lung cancer cells by lymphocytes and monocytes.  

PubMed

Ganglioside GM2 (GM2) frequently appears on the cell surface of human cancers of neuroendocrine origin. A mouse-human chimeric monoclonal antibody (mAb), KM966, against GM2 was previously found to promote the lysis of various cancer cells by human blood mononuclear cells (MNC). In this study, we analyzed the effector cells responsible for the chimeric mAb-dependent cell-mediated cytotoxicity (ADCC) against small cell lung cancer (SCLC) cells and examined the enhancing effect of various cytokines on the ADCC activity. The ADCC activity was assessed by 4-h 51Cr release assay. Highly purified lymphocytes (> 99%) and monocytes (> 90%) were separated by centrifugal elutriation from peripheral blood MNC of the same healthy donor. KM966 induced lysis of SCLC cells mediated by both lymphocytes and monocytes to similar extents, in a dose-dependent manner. Pretreatment of lymphocytes with various cytokines [interleukin (IL)-2, IL-12 and interferon-gamma] and that of monocytes with macrophage-colony-stimulating factor significantly augmented the killer activity against SCLC cells in the presence of KM966 mAb. KM966 was also effective for the lysis of non-small cell lung cancer cells in direct proportion to the GM2 expression levels. These findings suggest that combined treatment of KM966 mAb with cytokines may be therapeutically useful for in vivo killing of lung cancer cells expressing GM2 through the ADCC reaction. PMID:8641987

Hanibuchi, M; Yano, S; Nishioka, Y; Yanagawa, H; Sone, S

1996-05-01

17

Association between lymphocyte and monocyte subsets and cognition in children with HIV  

PubMed Central

Background This study assesses the relationships between lymphocyte and monocyte subsets and intelligence quotient (IQ) scores in antiretroviral therapy (ART)-naive, HIV-infected Thai children without advanced HIV disease. Findings Sixty-seven ART-naive Thai children with CD4 between 15-24% underwent cognitive testing by Weschler intelligence scale and had 13 cell subsets performed by flow cytometry including naive, memory and activated subsets of CD4+ and CD8+ T cells, activated and perivascular monocytes and B cells. Regression modelling with log10 cell count and cell percentage transformation was performed. Median age (IQR) was 9 (7–10) years, 33% were male, CDC stages N:A:B were 1:67:31%, median CD4% and count (IQR) were 21 (18–24)%, 597 (424–801) cells/mm3 and HIV RNA (IQR) was 4.6 (4.1-4.9) log10 copies/ml. Most (82%) lived at home, 45% had a biological parent as their primary caregiver, and 26 (49%) had low family income. The mean (SD) scores were 75 (13) for full scale IQ (FIQ), 73 (12) for verbal IQ (VIQ) and 80 (14) for performance IQ (PIQ). Adjusted multivariate regression analysis showed significant negative associations between B cell counts and FIQ, VIQ and PIQ (p?lymphocyte subsets and neurocognitive development. PMID:24450991

2014-01-01

18

Immunogenetic analysis of cellular interactions governing the recruitment of T lymphocytes and monocytes in lymphocytic choriomeningitis virus-induced immunopathology  

SciTech Connect

The Lyt2+ class I major histocompatibility complex (MHC)-restricted virus-immune T cells that induce murine lymphocytic choriomeningitis (LCM) are targeted onto radiation-resistant cells in the central nervous system of virus-infected mice. The use of appropriate bone marrow radiation chimeras as LCM virus-infected, (immunosuppressed recipients for immune T-cell transfer has established that, though bone marrow-derived cells can stimulate virus-specific cytotoxic T lymphocytes (CTL) in spleen, they do not reconstitute the barrier to T-cell recruitment from blood to cerebrospinal fluid. This is true for chimeras made up to 8 months previously, even though the inflammatory monocytes and macrophages in such chimeras are all of donor bone marrow origin. Radiation-resistant cells in the spleens of these chimeras are also still able to further stimulate virus-immune CTL. There is no requirement for H-2 compatibility between virus-immune T lymphocytes and secondarily recruited monocytes, or T cells of an inappropriate specificity. The key event in LCM immunopathology may thus be localization of T cells to the antigen-presenting endothelium in brain, leading to the secretion of mediators that promote the nonspecific recruitment of monocytes and other T cells.

Doherty, P.C.; Ceredig, R.; Allan, J.E.

1988-04-01

19

Immature Dendritic Cells Generated from Cryopreserved Human Monocytes Show Impaired Ability to Respond to LPS and to Induce Allogeneic Lymphocyte Proliferation  

PubMed Central

Dendritic cells play a key role in the immune system, in the sensing of foreign antigens and triggering of an adaptive immune response. Cryopreservation of human monocytes was investigated to understand its effect on differentiation into immature monocyte-derived dendritic cells (imdDCs), the response to inflammatory stimuli and the ability to induce allogeneic lymphocyte proliferation. Cryopreserved (crp)-monocytes were able to differentiate into imdDCs, albeit to a lesser extent than freshly (frh)-obtained monocytes. Furthermore, crp-imdDCs had lower rates of maturation and cytokine/chemokine secretion in response to LPS than frh-imdDCs. Lower expression of Toll-like receptor 4 (at 24 and 48 h) and higher susceptibility to apoptosis in crp-imdDCs than in fresh cells would account for the impaired maturation and cytokine/chemokine secretion observed. A mixed leukocyte reaction showed that lymphocyte proliferation was lower with crp-imdDCs than with frh-imdDCs. These findings suggested that the source of monocytes used to generate human imdDCs could influence the accuracy of results observed in studies of the immune response to pathogens, lymphocyte activation, vaccination and antigen sensing. It is not always possible to work with freshly isolated monocytes but the possible effects of freezing/thawing on the biology and responsiveness of imdDCs should be taken into account. PMID:23936267

Silveira, Guilherme Ferreira; Wowk, Pryscilla Fanini; Machado, Anália Maria Breckenfeld; dos Santos, Claudia Nunes Duarte; Bordignon, Juliano

2013-01-01

20

A functional (pro)renin receptor is expressed in human lymphocytes and monocytes.  

PubMed

The renin-angiotensin system (RAS) is involved in inflammation. The signaling via the ANG II type 1 receptor in human lymphocytes and monocytes, which play key roles in pathophysiology of glomerulonephritis (GN), can enhance inflammation. However, the role of the (pro)renin receptor [(P)RR], a component of the RAS, in inflammatory reactions is unknown. We assessed whether (P)RR is expressed in human lymphocytes and monocytes by RT-PCR, Western blotting, flow cytometry, and immunohistochemistry, and whether (P)RR functions in inflammation. (P)RR mRNA and protein were expressed in human peripheral blood mononuclear cells (PBMCs). Flow cytometric analysis revealed high expression of (P)RR on monocytes. (P)RR was present on PBMCs, infiltrating lymphocytes, and macrophages around glomeruli with a crescent in anti-neutrophil cytoplasmic antibody (ANCA)-associated GN. Renin stimulation of PBMCs from healthy subjects in the presence of the ANG II type 1 receptor and ANG II type 2 receptor blockers induced ERK1/2 phosphorylation and release of IL-6 and expression of cyclooxygenase-2 (COX-2). The increases in cytokine release and COX-2 expression were inhibited in the presence of an ERK1/2 inhibitor. (P)RR knockdown by small interfering RNA in U937 cells, a human leukemic monocyte lymphoma cell line, significantly decreased ERK1/2 phosphorylation after renin stimulation. Thus (P)RR expressed in human inflammatory cells might contribute to inflammation in ANCA-associated GN. PMID:25503726

Narumi, Kaori; Hirose, Takuo; Sato, Emiko; Mori, Takefumi; Kisu, Kiyomi; Ishikawa, Mayuko; Totsune, Kazuhito; Ishii, Tomonori; Ichihara, Atsuhiro; Nguyen, Genevieve; Sato, Hiroshi; Ito, Sadayoshi

2015-03-01

21

Peripheral blood monocyte and T-lymphocyte activation levels at diagnosis predict long-term survival in head and neck squamous cell carcinoma patients.  

PubMed

This study was performed to determine whether peripheral blood (PB) monocyte and/or lymphocyte activation at diagnosis were associated with long-term prognosis in patients with head and neck squamous cell carcinoma (HNSCC), and to what extent such prognostic properties relate to human papilloma virus (HPV)-associated tumor infection of the included patients. This was a long-term prospective study describing patient survival in relation to PB T lymphocyte and monocyte activation in patients observed for up to 14 years following diagnosis. Sixty-four patients from a consecutive cohort of newly diagnosed HNSCC patients along with 16 non-cancer control patients were included over a period of almost 2 years. Monocyte responsiveness was assessed at diagnosis (N = 56 HNSCC/16 non-cancer controls) by measuring net levels of spontaneous vs lipopolysaccharide-induced monocyte chemotactic protein (MCP)-1 secretion in vitro. PB T lymphocyte activation was determined (N = 58 HNSCC/16 controls) by measuring the percentage of T cells expressing CD69 by flow cytometry. Whether HPV infection or not was determined by PCR analysis on formalin fixed paraffin-embedded tumor tissue. Tumor HPV-positive patients had better prognosis than HPV-negative patients. A low net MCP-1 response in monocytes predicted increased survival (Relative risk (RR) = 2.1; Confidence interval (CI): 1.1-4.0; p < 0.05). A low percentage of CD69 positive T lymphocytes also predicted better prognosis (RR = 2.6; CI: 1.3-5.0; p = 0.005). The predictive power of MCP-1 monocyte and CD69 T lymphocyte measures were retained when adjusted for age and gender of the patients and shown to be independent of each other (N = 50 HNSCC/16 controls). The results were similar in HPV tumor-positive and -negative patients. Patients with high monocyte- and/or T lymphocyte activation status had low survival with 8% 5 year overall survival (OS) compared to 65% 5 year OS for patients with dual low activation levels (RR = 0.27; CI: 0.14-0.56; p < 0.001), mostly secondary to disease-specific survival. Both tumor HPV-positive and -negative HNSCC patients with high percentage of CD69 positive T lymphocytes and/or high monocyte MCP-1 secretion had low long-term survival. The data suggest that the general inflammatory and adaptive immune systems are independently linked to the clinical aggressiveness of both tumor HPV-negative and -positive HNSCC patients. PMID:25801083

Aarstad, Hans Jørgen; Vintermyr, Olav K; Ulvestad, Elling; Aarstad, Helene H; Kross, Kenneth W; Heimdal, John H

2015-04-01

22

CD4+ CCR5+ and CD4+ CCR3+ lymphocyte subset and monocyte apoptosis in patients with acute visceral leishmaniasis  

PubMed Central

The potential involvement of apoptosis in the pathogenesis of visceral leishmaniasis (VL) was examined by studying spontaneous and Leishmania antigen (LAg)-induced apoptosis using cryopreserved peripheral blood mononuclear cells (PBMC) of Sicilian patients with VL. Results indicate that monocytes and T lymphocytes from acute VL patients show a significantly higher level of apoptosis compared with that observed in healed subjects. The percentage of apoptotic cells was higher in monocytes than in T lymphocytes. T cells involved in programmed cell death (PCD) were mainly of the CD4+ phenotype. In particular, the T helper 1-type (Th1) subset, as evaluated by chemokine receptor-5 (CCR5) expression, is involved in this process. Cell death in Th1-type uses a CD95-mediated mechanism. Furthermore, Th1-type CCR5+ cells are prone to cell suicide in an autocrine or paracrine way, as attested by enhanced expression of CD95L in acute VL patients. The reduction in Th1-type cells by apoptosis was confirmed by the decrease in interferon-? secretion. In conclusion, apoptosis of monocytes, CD4+ and CD4+ CCR5+ T cells could be involved in the failure of cell mediated immunity that is responsible for severe immune-depression in VL. PMID:15379987

Potestio, Marcella; D'Agostino, Pietro; Romano, Giuseppina Colonna; Milano, Salvatore; Ferlazzo, Viviana; Aquino, Alessandra; Di Bella, Gloria; Caruso, Rosalba; Gambino, Giuseppe; Vitale, Giustina; Mansueto, Serafino; Cillari, Enrico

2004-01-01

23

The association between the ratio of monocytes: lymphocytes and risk of tuberculosis among HIV-infected postpartum women.  

PubMed

Recent human studies support historical animal studies that suggested an association between peripheral blood monocyte:lymphocyte (ML) ratio and tuberculosis (TB) disease. To evaluate generalizability of this finding, we modeled the association between peripartum ML ratio and incident TB disease within 18 months postpartum among 1202 HIV-infected women in South Africa, Tanzania, Uganda, and Zimbabwe. The ML ratio was associated with increased risk of TB disease independently to combination antiretroviral therapy, World Health Organization stage, or CD4 count (adjusted hazard ratio = 1.22, 95% confidence interval: 1.07 to 1.4, P = 0.003 per 0.1 unit increase in ML ratio). PMID:25247435

Naranbhai, Vivek; Moodley, Dhayendre; Chipato, Tsungai; Stranix-Chibanda, Lynda; Nakabaiito, Clemensia; Kamateeka, Moreen; Musoke, Philippa; Manji, Karim; George, Kathleen; Emel, Lynda M; Richardson, Paul; Andrew, Philip; Fowler, MaryGlenn; Fletcher, Helen; McShane, Helen; Coovadia, Hoosen M; Hill, Adrian V S

2014-12-15

24

Staphylococcal exopolysaccharides inhibit lymphocyte proliferative responses by activation of monocyte prostaglandin production.  

PubMed Central

The glycocalyx (exopolysaccharides) of Staphylococcus epidermidis has been reported to inhibit a variety of host defense mechanisms. We have examined the inhibitory effects of glycocalyx on the proliferation of human peripheral blood mononuclear cells (PBMC) and the mechanism of this inhibition. Glycocalyx isolated and partially purified under endotoxin-free conditions from defined liquid medium cultures of S. epidermidis and Staphylococcus lugdunensis inhibited the proliferative response of PBMC when added to cultures at 10 to 100 micrograms/ml. Glycocalyx-mediated inhibition of phytohemagglutinin-stimulated proliferation of PBMC required the presence of plastic-adherent peripheral blood monocytes. Culture supernatants of monocytes stimulated with glycocalyx contained a soluble factor that inhibited the proliferation of monocyte-depleted PBMC. This soluble inhibitory factor was not produced in the absence of glycocalyx or in the presence of both glycocalyx and indomethacin. Analysis of the supernatants of cultures of adherent monocytes revealed that glycocalyx from S. epidermidis and from S. lugdunensis could activate monocyte production of prostaglandin E2 (PGE2), human interleukin-1, and tumor necrosis factor alpha. The addition of purified PGE2, at the same levels of PGE2 (greater than or equal to 10(-9) M) generated in the monocyte cultures, to PBMC cultures resulted in a similar inhibition of proliferative responses. It is concluded that, contrary to previous suggestions, the bacterial glycocalyx does not have a direct inhibitory effect on T lymphocytes. However, it does appear that glycocalyx from coagulase-negative staphylococci can activate monocyte PGE2 production and that it is this activity that in turn contributes to the inhibition of T-cell proliferation. PMID:1541565

Stout, R D; Ferguson, K P; Li, Y N; Lambe, D W

1992-01-01

25

Absolute monocyte and lymphocyte count prognostic score for patients with gastric cancer  

PubMed Central

AIM: To measure the prognostic significance of absolute monocyte count/absolute lymphocyte count prognostic score (AMLPS) in patients with gastric cancer. METHODS: We retrospectively examined the combination of absolute monocyte count (AMC) and absolute lymphocyte count (ALC) as prognostic variables in a cohort of 299 gastric cancer patients who underwent surgical resection between 2006 and 2013 and were followed at a single institution. Both AMC and ALC were dichotomized into two groups using cut-off points determined by receiving operator characteristic curve analysis. An AMLPS was generated, which stratified patients into three risk groups: low risk (both low AMC and high ALC), intermediate risk (either high AMC or low ALC), and high risk (both high AMC and low ALC). The primary objective of the study was to validate the impact of AMLPS on both disease-free survival (DFS) and overall survival (OS), and the second objective was to assess the AMLPS as an independent prognostic factor for survival in comparison with known prognostic factors. RESULTS: Using data from the entire cohort, the most discriminative cut-off values of AMC and ALC selected on the receiver operating characteristic curve were 672.4/?L and 1734/?L for DFS and OS. AMLPS risk groups included 158 (52.8%) patients in the low-risk, 128 (42.8%) in the intermediate-risk, and 13 (4.3%) in the high-risk group. With a median follow-up of 37.2 mo (range: 1.7-91.4 mo), five-year DFS rates in the low-, intermediate-, and high-risk groups were 83.4%, 78.7%, and 19.8%, respectively. And five-year OS rates in the low-, intermediate-, and high-risk groups were 89.3%, 81.1%, and 14.4%, respectively. On multivariate analysis performed with patient- and tumor-related factors, we identified AMLPS, age, and pathologic tumor-node-metastasis stage as the most valuable prognostic factors impacting DFS and OS. CONCLUSION: AMLPS identified patients with a poor DFS and OS, and it was independent of age, pathologic stage, and various inflammatory markers. PMID:25759535

Eo, Wan Kyu; Jeong, Da Wun; Chang, Hye Jung; Won, Kyu Yeoun; Choi, Sung Il; Kim, Se Hyun; Chun, Sung Wook; Oh, Young Lim; Lee, Tae Hwa; Kim, Young Ok; Kim, Ki Hyung; Ji, Yong Il; Kim, Ari; Kim, Heung Yeol

2015-01-01

26

Epitope-specific signaling through CD45 on T lymphocytes leads to cAMP synthesis in monocytes after ICAM-1-dependent cellular interaction.  

PubMed

We recently demonstrated that different CD45 monoclonal antibodies (mAb) are able to induce cellular aggregation in human peripheral blood mononuclear cells (PBMC) through LFA-1/ICAM-1 interactions. Such interactions could be down-modulated by protein kinase (PK) A/G inhibitors, but were unaffected by inhibitors of PKC, suggesting the involvement of PKA or PKG in CD45 mAb-induced adhesion. In this study we show that after incubation of PBMC with several (but not all) mAb to CD45, CD45RO and CD45RA, intracellular cAMP, but not cGMP concentrations readily increase, reaching a maximum 30 min after start of activation. As evidenced by several lines of investigation cAMP accumulation was independent of Fc receptor-associated signaling as well as tyrosine phosphatase activity of CD45. In highly pure T lymphocytes, CD45 mAb were unable to induce cAMP synthesis, but readily did so after addition of autologous monocytes. After paraformaldehyde fixation of both quiescent or IFN-gamma/TNF-alpha-preactivated monocytes, cAMP production was no longer detectable, suggesting monocytes as the cell of origin for the increased cAMP synthesis. Further, cAMP accumulation in monocytes occurred after reconstitution to T lymphocytes preincubated with CD45 mAb and extensively washed. Importantly, pretreatment of T lymphocyte/monocyte mixtures with LFA-1 mAb and/or ICAM-1 mAb down-regulated CD45 mAb-induced cAMP synthesis. Finally, we demonstrate that CD45 mAb are not only capable of inducing cAMP production, but also of directly stimulating PKA enzyme activity. Based on the data presented, we propose that CD45 signaling in T lymphocytes subsequently activates cAMP accumulation and PKA activation in monocytes via LFA-1/ICAM-1-dependent cellular interactions. PMID:9710208

Lorenz, H M; Lagoo, A S; Lagoo-Deenadalayan, S A; Barber, W H; Kalden, J R; Hardy, K J

1998-08-01

27

Correlation of hematological changes and serum and monocyte inhibition with the early suppression of phytohemagglutinin stimulation of lymphocytes in experimental infectious bursal disease.  

PubMed Central

Several experiments were conducted to study the mechanism of infectious bursal disease virus induced suppression of phytohemagglutinin stimulation of peripheral blood lymphocytes. Infectious bursal disease virus inoculation of one week old chicks resulted in significant suppression of phytohemagglutinin stimulation during the first three days after inoculation as demonstrated by a whole blood assay. Mild thymic necrosis was seen on day 3. Hematological changes during this time consisted of increased numbers of circulating lymphocytes and monocytes in infected chickens. Absolute monocyte counts remained elevated even after phytohemagglutinin stimulation had returned to normal. Furthermore, even after a 72.3% reduction in the monocyte population in leukocyte preparations, there was still marked viral induced suppression of phytohemagglutinin stimulation. An elevation in the absolute number of circulating large immature lymphocytes correlated with suppression of phytohemagglutinin stimulation. Sera from infected and control chickens depressed phytohemagglutinin stimulation of lymphocytes from control chickens at the 5 and 10% concentration. At the 1% concentration, inhibiton by control sera was considerably less than the inhibition by infected sera. The relationship between these findings and the mechanism of viral induced suppression of T-lymphocyte function is discussed. PMID:6284327

Confer, A W; MacWilliams, P S

1982-01-01

28

Methods for defining distinct bioenergetic profiles in platelets, lymphocytes, monocytes, and neutrophils, and the oxidative burst from human blood  

PubMed Central

Peripheral blood mononuclear cells and platelets have long been recognized as having the potential to act as sensitive markers for mitochondrial dysfunction in a broad range of pathological conditions. However, the bioenergetic function of these cells has not been examined from the same donors, yet this is important for the selection of cell types for translational studies. Here, we demonstrate the measurement of cellular bioenergetics in isolated human monocytes, lymphocytes, and platelets, including the oxidative burst from neutrophils and monocytes from individual donors. With the exception of neutrophils, all cell types tested exhibited oxygen consumption that could be ascribed to oxidative phosphorylation with each having a distinct bioenergetic profile and distribution of respiratory chain proteins. In marked contrast, neutrophils were essentially unresponsive to mitochondrial respiratory inhibitors indicating that they have a minimal requirement for oxidative phosphorylation. In monocytes and neutrophils, we demonstrate the stimulation of the oxidative burst using phorbol 12-myristate 13-acetate and its validation in normal human subjects. Taken together, these data suggest that selection of cell type from blood cells is critical for assessing bioenergetic dysfunction and redox biology in translational research. PMID:23528848

Chacko, Balu K; Kramer, Philip A; Ravi, Saranya; Johnson, Michelle S; Hardy, Robert W; Ballinger, Scott W; Darley-Usmar, Victor M

2013-01-01

29

PDL1 blockade improves survival in experimental sepsis by inhibiting lymphocyte apoptosis and reversing monocyte dysfunction  

Microsoft Academic Search

Introduction  Lymphocyte apoptosis and monocyte dysfunction play a pivotal role in sepsis-induced immunosuppression. Programmed death-1\\u000a (PD1) and its ligand programmed death ligand-1 (PD-L1) exert inhibitory function by regulating the balance among T cell activation,\\u000a tolerance, and immunopathology. PD-1 deficiency or blockade has been shown to improve survival in murine sepsis. However,\\u000a PD-L1 and PD-1 differ in their expression patterns and the

Yan Zhang; Ying Zhou; Jingsheng Lou; Jinbao Li; Lulong Bo; Keming Zhu; Xiaojian Wan; Xiaoming Deng; Zailong Cai

2010-01-01

30

Immunophenotyping of lymphocyte, monocyte and dendritic cell subsets in normal rhesus macaques by 12-color flow cytometry: Clarification on DC heterogeneity  

PubMed Central

Monitoring changes in rhesus macaque immune cell populations during infectious disease is crucial. The aim of this work was to simultaneously analyze the phenotype of rhesus macaque lymphocyte, monocyte and dendritic cell (DC) subsets using a single 12-color flow cytometry panel. Blood from healthy non-infected rhesus macaques was labeled with a cocktail of 12 antibodies. Data were compared to three smaller lineage specific panels and absolute and relative percentages of cells were compared. Our 12-color panel allows for the identification of the following major subsets: CD4+ and CD8+ T lymphocytes, B lymphocytes, natural killer (NK) cells, natural killer T (NKT) cells, monocyte subsets and four non-overlapping HLA-DR+ Lin- cell subsets: CD34+ hematopoietic stem cells, CD11c? CD123+ plasmacytoid DC, CD11c+ CD16+ and CD11c?/dim CD1c+ myeloid DC. The development of a multiparameter flow cytometry panel will allow for simultaneous enumeration of mature lymphocyte, NK cells, monocyte and DC subsets. Studying these major players of the immune system in one panel may give us a broader view of the immune response during SIV infection and the ability to better define the role of each of these individual cell types in the pathogenesis of AIDS. PMID:20600075

Autissier, Patrick; Soulas, Caroline; Burdo, Tricia H.; Williams, Kenneth C.

2010-01-01

31

Inhibitory and stimulatory effects of Pseudomonas aeruginosa pyocyanine on human T and B lymphocytes and human monocytes.  

PubMed Central

Pyocyanine, a pigment produced by Pseudomonas aeruginosa, has dual dose-dependent stimulatory as well as inhibitory effects on immune responses in vitro as measured by DNA synthesis of human T and B lymphocytes, interleukin-2 (IL-2) production by human T lymphocytes, immunoglobulin production by human B lymphocytes, and monokine production by human monocytes. In general, stimulatory activity was found at low concentrations of pyocyanine, whereas high concentrations of the pigment resulted in an inhibition of responses. At a pyocyanine concentration of 0.1 micrograms/ml or less the proliferation of T and B lymphocytes was enhanced, but at 0.5 micrograms/ml it was suppressed. IL-2 production by T lymphocytes was enhanced at concentrations up to 0.5 micrograms/ml but totally inhibited at 1.0 micrograms/ml. The differentiation of B lymphocytes to become immunoglobulin-producing cells was also enhanced in the presence of low doses of pyocyanine, whereas secretion of immunoglobulin by B lymphocytes was suppressed at all concentrations of pyocyanine. In contrast to the dual effects of pyocyanine on lymphocyte response, lipopolysaccharide-induced IL-1 and tumor necrosis factor release by monocytes was markedly enhanced by low as well as high concentrations of pyocyanine. From these results we conclude that this property of pyocyanine may lead to suppression of specific defense mechanisms and enhance harmful inflammatory reactions of the host during infection with Pseudomonas aeruginosa. PMID:2106495

Ulmer, A J; Pryjma, J; Tarnok, Z; Ernst, M; Flad, H D

1990-01-01

32

Lymphocyte-derived cytokines induce sequential expression of monocyte- and T cell-specific chemokines in human mesangial cells  

Microsoft Academic Search

Lymphocyte-derived cytokines induce sequential expression of monocyte- and T cell-specific chemokines in human mesangial cells. Chemokines are a family of small related proteins that play an important role in the selective recruitment of different leukocyte populations to the sites of inflammation. Human glomerular mesangial cells are potent producers of a variety of chemokines. Here we examined the kinetics of mesangial

Mario Schwarz; Heinfried H Radeke; Klaus Resch; Peter Uciechowski

1997-01-01

33

Different sensitivity to apoptosis in cells of monocytic or lymphocytic origin chronically infected with human immunodeficiency virus type-1.  

PubMed

Apoptotic death of CD4+ T lymphocytes is a major cause of the immunodeficiency caused by human immunodeficiency virus (HIV), but it is still unclear how this process precisely occurs. To characterize a potentially useful cellular model, we have analyzed the tendency of chronically HIV-infected CD4+ human cell lines of different origin to undergo apoptosis. We studied ACH-2 and U1 lines, derived from the CD4+ T-cell A301 and the promonocytic U937 cell lines, respectively, and induced apoptosis via several stimuli that trigger different pathways. Their capacity to regulate plasma membrane CD95 expression and to produce soluble CD95 was also analyzed. Using staurosporine, TNF-alpha plus cycloheximide, and gamma-radiations, we observed that ACH-2 were more sensitive to programmed cell death than A301, while U1 were less sensitive than U937. Both infected cell types had a lower sensitivity to CD95-induced apoptosis; the analysis of changes in mitochondrial membrane potential corroborated these observations. Plasma membrane CD95 was similarly regulated in all cell types, which, however, presented a different capacity to produce soluble CD95 molecules. Our in vitro results may offer a new perspective for developing further studies on the pathogenesis of HIV infection. A chronically infected cell line of lymphocytic origin is more susceptible to apoptosis than its parental cell type, while infected monocytic cells are less sensitive than their uninfected counterpart. Thus, it is possible to hypothesize that one of the reasons by which circulating monocytes survive and represent a viral reservoir is the capacity of HIV to decrease the sensitivity to apoptosis of this cell type. However, further studies on ex-vivo collected fresh cells, as well as on other cell lines, are urgently needed to confirm such hypothesis. PMID:14681550

Pinti, Marcello; Biswas, Priscilla; Troiano, Leonarda; Nasi, Milena; Ferraresi, Roberta; Mussini, Cristina; Vecchiet, Jacopo; Esposito, Roberto; Paganelli, Roberto; Cossarizza, Andrea

2003-12-01

34

Infection of monocyte-derived macrophages with human immunodeficiency virus type 1 (HIV-1). Monocyte-tropic and lymphocyte-tropic strains of HIV-1 show distinctive patterns of replication in a panel of cell types  

PubMed Central

To characterize the host range of different strains of HIV-1, we have used four types of cells, primary monocyte-derived macrophages (MDM), primary PBL, a promonocyte cell line (U937), and a CD4+ T cell line (SUP-T1). These cells were infected with three prototype strains of HIV- 1, a putative lymphocyte-tropic strain (IIIB), and two putative monocyte-tropic strains (SF162 and DV). Infections were monitored by assays for infectious virus, for cell-free and cell-associated viral antigen (p24), and for the proportion of cells infected by immunohistochemical staining. It was concluded that: (a) the use of four different cell types provides a useful biological matrix for distinguishing the tropism of different strains of HIV-1; this matrix yields more information than the infection of any single cell type. (b) A monocyte-tropic strain of HIV-1, such as strain SF162, shows a reciprocal host range when compared with a lymphocyte-tropic strain such as IIIB; strain SF162 replicates well in primary MDM but not in U937 or SUP-T1 cells, while strain IIIB replicates well in both U937 and SUP-T1 cells but not in MDM. (c) Both lymphocyte-tropic and monocyte-tropic strains of HIV-1 replicate well in PBL. (d) The promonocyte cell line, U937, and the T cell line, SUP-T1, differ markedly from primary cells, such as MDM and PBL, in their ability to support the replication of different strains of HIV-1; these cell lines cannot be used as surrogates for primary cells in host range studies of HIV-1 strains. PMID:2571666

1989-01-01

35

Low preoperative lymphocyte to monocyte ratio predicts poor cancer-specific survival in patients with esophageal squamous cell carcinoma  

PubMed Central

Background Recent studies have shown that the lymphocyte to monocyte ratio (LMR) is a useful predictive factor in various cancers. However, the prognostic value of LMR in patients with esophageal cancer has not been reported yet. The purpose of the current study was to determine the prognostic role of LMR in esophageal squamous cell carcinoma (ESCC). Methods Three-hundred and forty-eight patients who had undergone esophagectomy for ESCC were included. A receiver operating characteristic curve for survival prediction was plotted to verify the optimum cut-off point for LMR. Kaplan–Meier method was used to calculate the cancer-specific survival (CSS), the difference was assessed by the log-rank test. Univariate and multivariate analyses were performed to evaluate the prognostic factors. Results A receiver operating characteristic curve for survival prediction was plotted to verify the optimum cut-off point for LMR, which was 2.93. Patients with LMR ?2.93 had a significantly worse 5-year CSS than patients with LMR >2.93 (21.2% versus 59.3%, P<0.001). For subgroup analysis, the predictive value of LMR was also significant in patients with T1-2 cancer (P=0.003), T3-4a (P<0.001), and patients with (P=0.044) or without (P<0.001) nodal metastasis. In addition, the predictive value of LMR was also significant stratified by absolute lymphocyte count (P<0.001) and absolute monocyte count (P<0.001). In multivariate analysis, LMR was a significant predictive factor of CSS (P=0.010). Conclusion LMR is still a predictive factor for long-term survival in patients with ESCC. We conclude that 2.93 may be the optimum cut-off point for LMR in predicting survival in ESCC patients. PMID:25609981

Huang, Ying; Feng, Ji-Feng

2015-01-01

36

The human antimicrobial and chemotactic peptides LL-37 and alpha-defensins are expressed by specific lymphocyte and monocyte populations.  

PubMed

We identified antibacterial components in human T and natural killer (NK) cells by using freshly isolated lymphocytes enriched for T and NK cells as starting material. After growing these lymphocytes for 5 days in the presence of interleukin (IL)-2, we isolated and characterized several antibacterial peptides/proteins from the supernatant-alpha-defensins (HNP 1-3), LL-37, lysozyme, and a fragment of histone H2B-although other active components were also present. We then used reverse transcriptase-polymerase chain reaction to search for expression of the gene coding for LL-37 in several B-cell lines, gammadelta T-cell lines, NK clones, and one monocytic cell line, with positive results, but found no expression in several alphabeta T-cell lines. The alpha-defensins (HNP 1-3) were also found to be expressed in several of these cell lines. To confirm the presence of these antibacterial peptides in lymphocytes, we localized them to NK, gammadelta T cells, B cells, and monocytes/macrophages by using double-staining immunohistochemical analysis of freshly isolated lymphocytes. We also found that primary cultures of lymphocytes transcribe and secrete LL-37 and that these processes are affected by IL-6 and interferon-gamma. In addition, we demonstrated that LL-37 has chemotactic activity for polymorphonuclear leukocytes and CD4 T lymphocytes, whereas others have shown chemotactic activity for human alpha-defensins (HNP 1-2). These findings suggest that microbicidal peptides are effector molecules of lymphocytes and that antibacterial activity previously shown to be derived from T and NK cells may be partly mediated by the antibacterial peptides LL-37 and HNP 1-3. PMID:11049988

Agerberth, B; Charo, J; Werr, J; Olsson, B; Idali, F; Lindbom, L; Kiessling, R; Jörnvall, H; Wigzell, H; Gudmundsson, G H

2000-11-01

37

An Elevated Peripheral Blood Lymphocyte-to-Monocyte Ratio Predicts Favorable Response and Prognosis in Locally Advanced Breast Cancer following Neoadjuvant Chemotherapy  

PubMed Central

Purpose Neoadjuvant chemotherapy (NCT) is a standard treatment option for locally advanced breast cancer. However, the lack of an efficient method to predict treatment response and patient prognosis hampers the clinical evaluation of patient eligibility for NCT. An elevated lymphocyte-to-monocyte ratio (LMR) has been reported to be associated with a favorable prognosis for certain hematologic malignancies and for nasopharyngeal carcinoma; however, this association has not been investigated in breast cancer. The purpose of this study was to evaluate whether pre-NCT LMR analysis could predict the prognosis of patients with locally advanced breast cancer. Methods A retrospective cohort of 542 locally advanced breast cancer patients (T3/T4 and/or N2/N3 disease) receiving NCT followed by radical surgery was recruited between May 2002 and August 2011 at the Fudan University Shanghai Cancer Center. Counts for pre-NCT peripheral absolute lymphocytes and monocytes were obtained and used to calculate the LMR. Results Univariate and multivariate analysis revealed that higher LMR levels (?4.25) were significantly associated with favorable DFS (P?=?0.009 and P?=?0.011, respectively). Additionally, univariate analysis revealed that a higher lymphocyte count (?1.5×109/L) showed borderline significance for improved DFS (P?=?0.054), while a lower monocyte count (<0.4×109/L) was associated with a significantly better DFS (P?=?0.010). Conclusions An elevated pre-NCT peripheral LMR level was a significantly favorable factor for locally advanced breast cancer patient prognosis. This easily obtained variable may serve as a valuable marker to predict the outcomes of locally advanced breast cancer. PMID:25372468

Qian, Guo-Wei; Wang, Lei; Chen, Sheng; Jiang, Yi-Zhou; Zuo, Wen-Jia; Wu, Jiong; Hu, Xin; Shao, Zhi-Ming

2014-01-01

38

Histamine inhibits adhesion molecule expression in human monocytes, induced by advanced glycation end products, during the mixed lymphocyte reaction  

PubMed Central

Background and purpose: Post-transplant diabetes mellitus is a frequent complication among transplant recipients. Ligation of advanced glycation end products (AGEs) with their receptor on monocytes/macrophages plays important roles in the genesis of diabetic complications. The enhancement of adhesion molecule expression on monocytes/macrophages activates T-cells, reducing allograft survival. Out of four distinct AGE subtypes (AGE-2, AGE-3, AGE-4 and AGE-5), only AGE-2 and AGE-3 induced expression of intercellular adhesion molecules (ICAMs), output of cytokines and proliferation of lymphocytes, during the mixed lymphocyte reaction (MLR). Here we have assessed the role of histamine in the actions of AGEs during the MLR. Experimental approach: Human peripheral blood cells were used in these experiments. Flow cytometry was used to examine the expression of the ICAM-1, B7.1, B7.2 and CD40. Production of the cytokine interferon-?, and levels of cAMP were determined by elisa. Lymphocyte proliferation was determined by [3H]-thymidine uptake. Key results: Histamine concentration dependently inhibited the action of AGE-2 and AGE-3. The actions of histamine were antagonized by an H2-receptor antagonist, famotidine, and mimicked by H2/H4-receptor agonists, dimaprit and 4-methylhistamine. The effects of histamine were reversed by a protein kinase A (PKA) inhibitor, H89, and mimicked by dibutyryl cAMP and an adenylate cyclase activator, forskolin. Conclusions and implications: Histamine down-regulated AGE-2- and AGE-3-induced expression of adhesion molecules, cytokine production and lymphocyte proliferation via histamine H2 receptors and the cAMP/PKA pathway. PMID:20590628

Zhang, J; Takahashi, HK; Liu, K; Wake, H; Liu, R; Sadamori, H; Matsuda, H; Yagi, T; Yoshino, T; Mori, S; Nishibori, M

2010-01-01

39

The Ratio of Monocytes to Lymphocytes in Peripheral Blood Correlates with Increased Susceptibility to Clinical Malaria in Kenyan Children  

PubMed Central

Background Plasmodium falciparum malaria remains a major cause of illness and death in sub-Saharan Africa. Young children bear the brunt of the disease and though older children and adults suffer relatively fewer clinical attacks, they remain susceptible to asymptomatic P. falciparum infection. A better understanding of the host factors associated with immunity to clinical malaria and the ability to sustain asymptomatic P. falciparum infection will aid the development of improved strategies for disease prevention. Methods and Findings Here we investigate whether full differential blood counts can predict susceptibility to clinical malaria among Kenyan children sampled at five annual cross-sectional surveys. We find that the ratio of monocytes to lymphocytes, measured in peripheral blood at the time of survey, directly correlates with risk of clinical malaria during follow-up. This association is evident among children with asymptomatic P. falciparum infection at the time the cell counts are measured (Hazard ratio (HR) ?=? 2.7 (95% CI 1.42, 5.01, P ?=? 0.002) but not in those without detectable parasitaemia (HR ?=? 1.0 (95% CI 0.74, 1.42, P ?=? 0.9). Conclusions We propose that the monocyte to lymphocyte ratio, which is easily derived from routine full differential blood counts, reflects an individual's capacity to mount an effective immune response to P. falciparum infection. PMID:23437368

Warimwe, George M.; Murungi, Linda M.; Kamuyu, Gathoni; Nyangweso, George M.; Wambua, Juliana; Naranbhai, Vivek; Fletcher, Helen A.; Hill, Adrian V. S.; Bejon, Philip; Osier, Faith H. A.; Marsh, Kevin

2013-01-01

40

In vivo T lymphocyte origin of macrophage-tropic strains of HIV. Role of monocytes during in vitro isolation and in vivo infection.  

PubMed

Previously published isolation techniques with T cell blasts and monocyte-derived macrophages (MDM) were used to recover HIV from the PBMC of a group of 23 asymptomatic seropositive individuals. Viral isolation was more readily accomplished by MDM coculture resulting in 9 isolates being obtained exclusively by this method (macrophage tropic strains). To determine the in vivo cellular source of these isolates we separated PBMC from 5 of these 9 patients into T lymphocyte and monocyte fractions by flow microfluorometry. These fractions were then analyzed by polymerase chain reaction (PCR) for the presence of HIV-1 proviral DNA. In 4 out of these 5 patients HIV-1 proviral DNA could be detected exclusively in T lymphocytes but not in monocytes, although the virus could be isolated only by MDM coculture. In the remaining patient HIV could be amplified in both T lymphocytes and monocytes. Further phenotypic analysis revealed that, among T lymphocytes, only the CD4+ subset was infected with HIV. We conclude that among PBMC the most common in vivo source of HIV strains which preferentially infect macrophages in vitro is the CD4+ T lymphocyte. These data also suggest that the macrophage tropism characteristic of some HIV strains reflects predominantly an in vitro phenomenon. PMID:1972163

Massari, F E; Poli, G; Schnittman, S M; Psallidopoulos, M C; Davey, V; Fauci, A S

1990-06-15

41

Phosphatidylcholine hydrolysis activates NF-kappa B and increases human immunodeficiency virus replication in human monocytes and T lymphocytes.  

PubMed

We have tested whether breakdown of phosphatidylcholine (PC) initiated by exogenous addition of a PC-specific phospholipase C (PC-PLC) from Bacillus cereus or by endogenous overexpression of PC-PLC induces functional activation of NF-kappa B and increases human immunodeficiency virus (HIV) enhancer activity. PC-PLC-activated hydrolysis of PC was found to induce bona fide p50/p65 NF-kappa B binding activity in three different cell lines of human or murine origin. No significant changes in the turnover of other cellular phospholipids were detected in PC-PLC-treated cells. Induction of NF-kappa B by PC-PLC did not depend on de novo synthesis of proteins or autocrine secretion of either tumor necrosis factor or interleukin 1. In human monocytic and lymphoblastoid T-cell lines, induction of NF-kappa B by PC-PLC resulted in clear induction of luciferase expression vectors placed under the control of synthetic kappa B enhancers or wild type, but not kappa B-mutated, HIV long terminal repeat constructs. HIV replication was increased by PC-PLC in chronically infected monocytes and T lymphocytes. NF-kappa B activation promoted by addition of exogenous PC-PLC correlated with an intense production of diacylglycerol. However, addition of a phosphatidylinositol-specific PLC from B. cereus also induced diacylglycerol but did not activate kappa B enhancer-directed vectors. PC-PLC-induced NF-kappa B activation could not be blocked by a specific inhibitor of phorbol ester-inducible protein kinases C. These results indicate that a cellular transduction pathway, dependent on specific PC breakdown, is functional in T lymphocytes and monocytes and may be used by various transmembrane receptors to activate HIV transcription through NF-kappa B-dependent induction of the HIV enhancer. PMID:8411362

Arenzana-Seisdedos, F; Fernandez, B; Dominguez, I; Jacqué, J M; Thomas, D; Diaz-Meco, M T; Moscat, J; Virelizier, J L

1993-11-01

42

Monocyte–platelet complexes on CD14\\/CD16 monocyte subsets: relationship with ApoA-I levels. A preliminary study  

Microsoft Academic Search

The adhesion of the monocytes to the endothelium and their extravasation into the intima are key steps in atherogenesis. Studies showed the essential role of L-selectin (CD62-L), expressed by the monocytes, and the platelets by forming complexes with monocytes. The delipided apolipoprotein (Apo) A or high-density lipoprotein (HDL) has antiinflammatory effects on monocytes and can bind platelets (monocyte–platelet complexes [MPCs]).

Karim Zouaoui Boudjeltia; Dany Brohee; Pietrina Piro; Vincent Nuyens; Jean Ducobu; Myriam Kherkofs; Pierre Van Antwerpen; Philippe Cauchie; Claude Remacle; Michael Vanhaeverbeek

2008-01-01

43

Monocytes become macrophages; they do not become microglia: a light and electron microscopic autoradiographic study using 125-iododeoxyuridine  

SciTech Connect

This light and electron microscopic autoradiographic study of stab injuries in the spinal cord of mice evaluated the ultrastructural characteristics of cells labeled by incorporation of the thymidine analogue /sup 125/I-5-iodo-2'-deoxyuridine (I-UdR), injected one day prior to injury. I-UdR was used instead of tritiated thymidine (H-TdR) because H-TdR can be reutilized and is therefore not a suitable pulse label for long-term studies of cell migration. Using serial thick and thin sections for autoradiography 614 labeled cells were identified. Labeled cells included 545 monocytes/macrophages, 50 lymphocytes, 17 pericytes, one endothelial cell, and one arachnoid cell. No labeled cell had the morphology of microglia. We concluded that macrophages in stab injuries of the spinal cord of mice are derived from blood monocytes. Blood-derived lymphocytes are also involved in the reaction to spinal cord stab injury. Microglia are not blood-derived and are not seen as a transitional form in the differentiation of monocytes to macrophages.

Schelper, R.L.; Adrian, E.K. Jr.

1986-01-01

44

Infection of human monocytes by Chlamydia pneumoniae and Chlamydia trachomatis: an in vitro comparative study  

PubMed Central

Background An increasing number of studies suggest that chlamydiae can infect immune cells. The altered immune cell function could contribute to the progression of several chronic inflammatory diseases. The aim of this study was to comparatively evaluate Chlamydia pneumoniae (CP) and Chlamydia trachomatis (CT) interactions with in vitro infected human blood monocytes. Results Fresh isolated monocytes were infected with viable CP and CT elementary bodies and infectivity was evaluated by recultivating disrupted monocytes in permissive epithelial cells. The production of reactive oxygen and nitrogen species was studied in the presence of specific fluorescent probes. Moreover, TNF-?, INF-?, INF-? and INF-? gene expression was determined. CT clearance from monocytes was complete at any time points after infection, while CP was able to survive up to 48 hours after infection. When NADPH oxydase or nitric oxide synthase inhibitors were used, CT infectivity in monocytes was restored, even if at low level, and CT recovery’s rate was comparable to CP one. CT-infected monocytes produced significantly higher levels of reactive species compared with CP-infected monocytes, at very early time points after infection. In the same meanwhile, TNF-? and INF-? gene expression was significantly increased in CT-infected monocytes. Conclusions Our data confirm that CP, but not CT, is able to survive in infected monocytes up to 48 hours post-infection. The delay in reactive species and cytokines production by CP-infected monocytes seems to be crucial for CP survival. PMID:24721461

2014-01-01

45

Recombinant human interferon-inducible protein 10 is a chemoattractant for human monocytes and T lymphocytes and promotes T cell adhesion to endothelial cells  

PubMed Central

The human cytokine interferon-inducible protein 10 (IP-10) is a small glycoprotein secreted by activated T cells, monocytes, endothelial cells, and keratinocytes, and is structurally related to a family of chemotactic cytokines called chemokines. Although this protein is present in sites of delayed-type hypersensitivity reactions and lepromatous leprosy lesions, the biological activity of IP-10 remains unknown. We report here that recombinant human IP-10 stimulated significant in vitro chemotaxis of human peripheral blood monocytes but not neutrophils. Recombinant human IP-10 also stimulated chemotaxis of stimulated, but not unstimulated, human peripheral blood T lymphocytes. Phenotypic analysis of the stimulated T cell population responsive to IP-10 demonstrated that stimulated CD4+ and CD29+ T cells migrated in response to IP-10. This resembles the biological activity of the previously described T cell chemoattractant RANTES. Using an endothelial cell adhesion assay, we demonstrated that stimulated T cells pretreated with optimal doses of IP-10 exhibited a greatly enhanced ability to bind to an interleukin 1-treated endothelial cell monolayer. These results demonstrate that the IP-10 gene encodes for an inflammatory mediator that specifically stimulates the directional migration of T cells and monocytes as well as potentiates T cell adhesion to endothelium. PMID:8496693

1993-01-01

46

Attenuated Monocyte Apoptosis, a New Mechanism for Osteoporosis Suggested by a Transcriptome-Wide Expression Study of Monocytes  

PubMed Central

Background Osteoporosis is caused by excessive bone resorption (by osteoclasts) over bone formation (by osteoblasts). Monocytes are important to osteoporosis by serving as progenitors of osteoclasts and produce cytokines for osteoclastogenesis. Aim To identify osteoporosis-related genes, we performed microarray analyses of monocytes using Affymetrix 1.0 ST arrays in 42 (including 16 pre- and 26 postmenopausal) high hip BMD (bone mineral density) vs. 31 (including 15 pre- and 16 postmenopausal) low hip BMD Caucasian female subjects. Here, high vs. low BMD is defined as belonging to top vs. bottom 30% of BMD values in population. Method Differential gene expression analysis in high vs. low BMD subjects was conducted in the total cohort as well as pre- and post-menopausal subjects. Focusing on the top differentially expressed genes identified in the total, the pre- and the postmenopausal subjects (with a p <5E-03), we performed replication of the findings in 3 independent datasets of microarray analyses of monocytes (total N = 125). Results We identified (in the 73 subjects) and successfully replicated in all the 3 independent datasets 2 genes, DAXX and PLK3. Interestingly, both genes are apoptosis induction genes and both down-regulated in the low BMD subjects. Moreover, using the top 200 genes identified in the meta-analysis across all of the 4 microarray datasets, GO term enrichment analysis identified a number of terms related to induction of apoptosis, for which the majority of component genes are also down-regulated in the low BMD subjects. Overall, our result may suggest that there might be a decreased apoptosis activity of monocytes in the low BMD subjects. Conclusion Our study for the first time suggested a decreased apoptosis rate (hence an increased survival) of monocytes, an important osteoclastogenic cell, as a novel mechanism for osteoporosis. PMID:25659073

Liu, Yao-Zhong; Zhou, Yu; Zhang, Lei; Li, Jian; Tian, Qing; Zhang, Ji-Gang; Deng, Hong-Wen

2015-01-01

47

Biophysical studies on the differentiation of human CD14 + monocytes into dendritic cells  

Microsoft Academic Search

Dendritic cells (DCs), which are the most efficient antigen-presenting cells (APCs) currently known, can be derived from CD14+ monocytes (DC predecessor cells) in vitro. Immature DCs actively take up antigens and pathogens, generate major histocompatability\\u000a complex-peptide complexes, and migrate from the sites of antigen acquisition to secondary lymphoid organs to become mature\\u000a dendritic cells that interact with and stimulate T-lymphocytes.

Zhu Zeng; Xiao Liu; Yuhui Jiang; Guotao Wang; Jun Zhan; Jun Guo; Weijuan Yao; Dagong Sun; Weibo Ka; Yan Tang; Junming Tang; Zongyao Wen; Shu Chien

2006-01-01

48

Virus-specific HLA-restricted lysis of herpes simplex virus-infected human monocytes and macrophages mediated by cytotoxic T lymphocytes  

SciTech Connect

Freshly-isolated peripheral blood human monocytes and 5 day in vitro cultured macrophages were infected with herpes simplex virus type 1 (HSV-1), labeled with /sup 51/Cr, and used as target cells in a 12-14 hour cell-mediated cytotoxicity assay. Mononuclear leukocytes (MNL) from HSV-1 non-immune individuals, whether unstimulated or stimulated with HSV-1 antigen, did not mediate significant lysis of either target cell. HSV-immune MNL, both freshly-isolated and cultured for 5 days without antigen, demonstrated only low levels of natural killer (NK) cell-mediate lysis. MNL from HSV-immune individuals incubated for 5 days in vitro with HSV-1 antigen mediated significant virus-specific lysis of both target cells. Mean virus-specific lysis of autologous monocytes was 8.5(/+-/2.0)% compared to a three-fold greater virus-specific lysis of autologous macrophages. Greater than 70% of this lytic activity was mediated by Leu-11-negative, T3-positive cytotoxic T lymphocytes (CTL). Allogeneic target cells lacking a common HLA determinant were not significantly lysed while T8-positive CTL mediated infrequent lysis of target cells sharing a common HLA-A and/or HLA-B determinant. T4-positive lymphocytes were demonstrated to be the predominant cell mediating lysis of autologous target cells and allogeneic target cells sharing both HLA-A and/or HLA-B plus HLA-DR determinants with the CTL; the T4-positive cell was the sole CTL mediator of lysis of allogeneic target cells having a common HLA-DR determinant.

Torpey, D.J. III

1987-01-01

49

Allergy or Tolerance: Reduced Inflammatory Cytokine Response and Concomitant IL-10 Production of Lymphocytes and Monocytes in Symptom-Free Titanium Dental Implant Patients  

PubMed Central

Hypersensitivity reactions to titanium (Ti) are very rare. Thus, we assessed the proinflammatory response and also potential tolerance favoring in vitro reactivity of human blood lymphocytes and monocytes (PBMC) to Ti in healthy individuals (14 without, 6 with complication-free dental Ti implants). The proliferation index (SI) in lymphocyte transformation test (LTT) and production of cytokines linked to innate immune response (IL-1?, IL-6, and TNF?) or immune regulation (IL-10) were assessed in response to TiO2 particles or Ti discs. In both groups, the Ti-LTT reactivity was not enhanced (e.g., SI < 3). The control antigen tetanus toxoid (TT) gave adequate reactivity (median SI individuals without/with implant: 20.6 ± 5.97/19.58 ± 2.99). Individuals without implant showed higher cytokine response to Ti materials than individuals with symptom-free implants; for example, TiO2 rutile particle induced increase of IL-1? 70.27-fold/8.49-fold versus control medium culture. PBMC of 5 of the 6 individuals with complication-free Ti implants showed an ex vivo ongoing production of IL-10 (mean 4.18 ± 2.98?pg/mL)-but none of the 14 controls showed such IL-10 production. Thus in vitro IL-1?-, IL-6-, and TNF-? production reflects “normal” unspecific immune response to Ti. This might be reduced by production of tolerogenic IL-10 in individuals with symptom-free Ti dental implants. PMID:24106709

Thomas, Peter; Wollenberg, Andreas

2013-01-01

50

The detection and identification of subpopulations of circulating human lymphocytes, monocytes and neutrophils capable of effecting a mitogen-induced cell-mediated cytotoxic reaction towards erythrocytes of various species.  

PubMed Central

The mitogen-induced cell-mediated cytotoxic (MICC) reaction was evaluated in terms of its capacity to identify cytotoxic cells among normal human blood leucocytes. Three conventional mitogens were used (phytohaemagglutinin, pokeweed and concanavalin A) and nine different erythrocyte target cells (chicken, horse, human, ox, rabbit, sheep, mouse, rat and guinea-pig). The effector cells investigated were mononuclear cells, monocyte-depleted mononuclear cells and polymorphonuclear leucocytes. Phytohaemagglutinin consistently mediated the lysis of only chicken erythrocytes whereas pokeweed consistently mediated the lysis of rabbit erythrocytes and, to a much lesser degree, chicken and rat erythrocytes. Con A consistently mediated the lysis of chicken, horse, rabbit, guinea-pig and sheep erythrocytes. Irrespective of the target cell used, PHA and Con A facilitated target cell lysis by monocytes and polymorphs and not by lymphocytes which displayed no cytotoxic activity in the presence of these two mitogens. On the other hand, pokeweed-mediated cytolysis of rabbit erythrocyte target cells was induced by lymphocytes in addition to monocytes and polymorphs. Only monocytes were able to lyse chicken erythrocytes in the presence of pokeweed; polymorphs and lymphocytes were inactive. Agglutination or aggregation of the target cells by the mitogen is not a mandatory concomitant of the MICC reaction. Some RBC may be agglutinated by the mitogen without being lysed by effector cells in the presence of the mitogen. The mechanism of mitogen-mediated cytolysis of target cells remains to be elucidated. These results suggest that the MICC assay can be utilized as a probe to permit the selective detection of functionally distinct subpopulations of cytotoxic monocytes, lymphocytes and polymorphs. Whether these cytotoxic cells are identical to, overlap or are distinct from those cells which mediate the NOCC and ADCC cytotoxic reactions remains to be determined. PMID:7461704

Cortens, M; Sklar, S; Richter, M

1980-01-01

51

Development of a novel in vitro model to study the tryptic : endothelial cells, monocytes and flow  

E-print Network

This thesis describes the development of a novel in vitro model of monocytes transmigration under flow and use in the study of early molecular events of atherogenesis. In this work, we focused on how endothelial dysfunction, ...

Turjman, Alexis S. (Alexis Salomon)

2014-01-01

52

Lectin-binding profile of plasmacytoid monocytes.  

PubMed

The lectin-binding profile of plasmacytoid monocytes, also known as plasmacytoid T cells, was studied in 18 axillary lymph nodes draining invasive breast carcinomas. The plasmacytoid monocytes bound fluorescein-conjugated lectins from Canavalia ensiformis (Con A), Phaseolus vulgaris (PHA-L), Arachis hypogaea (PNA), Ricinus communis (RCA I and II), and Triticum vulgaris (WGA), but no reaction was found with those from Dolichos biflorus (DBA) and Ulex europaeus (UEA I). Fluorescence was bright and the reactivity was distributed in a granular pattern in the cytoplasm of plasmacytoid monocytes, a staining pattern similar to that of monocytes and macrophages. B and T lymphocytes usually exhibited weak staining with the same lectins, and this was limited to the cell membrane. Plasmacytoid monocytes were originally thought to be closely related to the T-cell system. The results of recent immunocytologic studies and the lectin-binding profile of plasmacytoid monocytes observed in this study, however, suggest that these cells are related to the mononuclear phagocytic system. PMID:1398646

Horst, H A; Schumacher, U; Horny, H P; Lennert, K

1992-10-01

53

Virus production and viral antigen expression in porcine blood monocytes inoculated with pseudorabies virus.  

PubMed

Interactions of pseudorabies virus (PRV) with peripheral blood mononuclear cells (PBMC) were studied. T-lymphocytes, B-lymphocytes and monocytes were selected or depleted from the PBMC fraction by means of several separation techniques. After inoculation with virulent PRV in vitro, the percentage of cells that expressed viral antigens was determined in the different subpopulations by immunofluorescence. The susceptibility of monocytes depended on the method of isolation. When plasma-coated polystyrene culture grade dishes were used, 17 to 26% of the monocytes showed expression of viral antigens. However, PRV antigens were detected in only 2% of the monocytes when the cells had first been labelled with monoclonal antibodies against a monocyte marker and subsequently separated on polystyrene bacteriological Petri disches coated with anti-mouse monoclonal antibodies. In subpopulations of unstimulated T- and B-lymphocytes only 0.4 to 0.7% of the cells were found positive by immunofluorescence. Viral antigens appeared in the cytoplasm and on the cell membrane of monocytes isolated on plasma-coated dishes starting 5 h after inoculation and the expression was found in a maximal number of monocytes, 7 to 8 h after inoculation. The intracellular and extracellular virus progeny titers obtained in monocyte cultures were low, ranging from 10(4.3) to 10(5.2) TClD50 per 10(6) inoculated monocytes. The percentage of inoculated monocytes which produced infectious PRV was 0.1% in two experiments and less than 0.01% in one experiment. The results indicate that although monocytes are the most susceptible subpopulation of unstimulated PBMC to a PRV infection in vitro, replication is clearly restricted. Only a subset of monocytes expresses viral antigens and an even smaller fraction produces infectious virus. PMID:7979999

Nauwynck, H J; Pensaert, M B

1994-01-01

54

The lymphocyte to monocyte ratio improves the IPI-risk definition of diffuse large B-cell lymphoma when rituximab is added to chemotherapy.  

PubMed

The peripheral blood lymphocyte to monocyte ratio (LMR) at diagnosis can be clinically relevant in patients with diffuse large B-cell lymphoma (DLBCL). We reviewed the outcome of 1,057 DLBCL patients followed from 1984 to 2012 at four centers. LMR was analyzed as a clinical biomarker by receiver-operating characteristic (ROC) analysis and Harrell's C-statistics. Patients were characterized by a median age of 61 years, International Prognostic Index (IPI) score of >2 in 39%, and were treated with a rituximab-containing chemotherapy in 66%. LMR proved strongly predictive for survival in patients treated with rituximab-based programs, but not in those receiving chemotherapy alone. Additionally, an LMR value of ?2.6 (as determined by ROC analysis) was associated with a worst performance status, a higher lactate dehydrogenase (LDH) level, an advanced clinical stage, and a higher IPI score (P = 0.000). In patients treated with rituximab-supplemented chemotherapy programs, an LMR value of <2.6 was found in most of the primary refractory patients (75%) which proved as the best cutoff to predict both response and survival (P = 0.018). Finally, multivariate analysis and Harrell's C-statistics confirmed the IPI-independent role of LMR on survival (P = 0.0000). In conclusion, LMR is a potent predictor of clinical response and survival in DLBCL treated with rituximab-containing chemotherapy. PMID:23940056

Rambaldi, Alessandro; Boschini, Cristina; Gritti, Giuseppe; Delaini, Federica; Oldani, Elena; Rossi, Andrea; Barbui, Anna Maria; Caracciolo, Daniele; Ladetto, Marco; Gueli, Angela; De Crescenzo, Alberto; Passera, Roberto; Devizzi, Liliana; Patti, Caterina; Gianni, Alessandro Massimo; Tarella, Corrado

2013-12-01

55

Longitudinal studies of blood lymphocyte capacity in Hodgkin's disease  

SciTech Connect

Blood lymphocyte functional capacity and serum immunoglobulins were studied in 40 patients with Hodgkin's disease (HD) admitted to Radiumhemmet, Stockholm, before treatment and in complete remission 2-56 months following termination of radiotherapy (total nodal irradiation (TNI); n . 29) or chemotherapy (MOPP; n . 11). Lymphocyte studies included determination of total lymphocyte and T-cell counts and evaluation of spontaneous DNA synthesis during the first day of culture and mitogen-(concanavalin A, pokeweed mitogen) and antigen (purified protein derivative, PPD)-induced activation on the third day. Blood lymphocyte and T-cell counts decreased dramatically following TNI. A slow restitution was seen, but pretreatment levels were not reached even four years following therapy. The responses to ConA and PPD but not PWM were significantly reduced shortly after TNI. The mitogen response did not increase with time as did the PPD response. Lymphocyte counts and lymphocyte stimulation, which were severely depressed before treatment of patients in the chemotherapy group, remained unchanged 2-36 months after termination of therapy. A significant reduction of IgM levels was observed regardless of the mode of treatment. Splenectomy prevented the profound reduction of blood lymphocyte and T-cell counts following therapy but did not influence the other immunologic variables under study.

Bjoerkholm, M.; Wedelin, C.; Holm, G.; Johansson, B.; Mellstedt, H.

1981-11-01

56

Column separation of monocytes by adherence to gelatin beads.  

PubMed

This investigation was performed to study whether the efficient binding of collagen to monocytes in the presence of fibronectin and heparin may be used for separation of monocytes from human peripheral blood. It was shown that monocytes adhere selectively to gelatin bead columns in the presence of fresh plasma and heparin. Mononuclear blood cells are rapidly depleted of monocytes by passage through a 5-10 ml column at a flow rate of 1.5-2.0 ml per min. Adhering lymphocytes are more loosely attached and may be detached by stirring and washing, while the monocytes can be eluted by 50 mM EDTA. This separation technique is suitable for combination with various other methods since it is rapid, allows convenient handling of large numbers and yields cells with very high viability. Although most B lymphocytes pass through the column without attaching, there is some enrichment of B cells and non-T, non-B cells among the adherent lymphocytes. PMID:6833763

Sjögren, H O; Nilsson, K; Malmström, P; Axelsson, B

1983-02-11

57

Studies on cytolytic mechanisms of activated macrophages and monocytes  

SciTech Connect

Pulmonary alveolar macrophages (PAM) and peripheral blood monocytes (PBMo) of the miniature swine can be converted to cytolytically active cells by treating with phorbol myristic acetate (PMA) or combined stimulation with recombinant human interferon - ..gamma.. (rHuIFN-..gamma..) and lipopolysaccharide (LPS). These activated PAM and PBMo become cytolytic to various targets by producing neutral proteases. H/sub 2/O/sub 2/ and cytotoxic factors. While the PAM stimulated by PMA was most active in generating H/sub 2/O/sub 2/ as well as neutral proteases, the PBMo stimulated with PMA was able to produce only H/sub 2/O/sub 2/. The mechanism of killing by PAM seemed to vary with type of target cells: H/sub 2/O/sub 2/ was effective in killing of PRBC, SRBC, and K562, but proteases were responsible for the lysis of U937 and WEHI-164. In contrast to PMA stimulation, combined stimulation with rHuIFN-..gamma.. and LPS was very effective in generation of cytotoxic factors from PAM and PBMo. These cytotoxic factors were directly toxic to various target cells including WEHI-164, U937, K562, and CRBC, but not to autologous target such as PRBC.

Chung, T.; Kim, Y.B.

1986-03-05

58

The Kruppel-like factor KLF4 is a critical regulator of monocyte differentiation  

PubMed Central

Monocyte differentiation involves the participation of lineage-restricted transcription factors, although the mechanisms by which this process occurs are incompletely defined. Within the hematopoietic system, members of the Kruppel-like family of factors (KLFs) play essential roles in erythrocyte and T lymphocyte development. Here we show that KLF4/GKLF is expressed in a monocyte-restricted and stage-specific pattern during myelopoiesis and functions to promote monocyte differentiation. Overexpression of KLF4 in HL-60 cells confers the characteristics of mature monocytes. Conversely, KLF4 knockdown blocked phorbol ester-induced monocyte differentiation. Forced expression of KLF4 in primary common myeloid progenitors (CMPs) or hematopoietic stem cells (HSCs) induced exclusive monocyte differentiation in clonogenic assays, whereas KLF4 deficiency inhibited monocyte but increased granulocyte differentiation. Mechanistic studies demonstrate that KLF4 is a target gene of PU.1. Consistently, KLF4 can rescue PU.1?/? fetal liver cells along the monocytic lineage and can activate the monocytic-specific CD14 promoter. Thus, KLF4 is a critical regulator in the transcriptional network controlling monocyte differentiation. PMID:17762869

Feinberg, Mark W; Wara, Akm Khyrul; Cao, Zhuoxiao; Lebedeva, Maria A; Rosenbauer, Frank; Iwasaki, Hiromi; Hirai, Hideyo; Katz, Jonathan P; Haspel, Richard L; Gray, Susan; Akashi, Koichi; Segre, Julie; Kaestner, Klaus H; Tenen, Daniel G; Jain, Mukesh K

2007-01-01

59

Lymphocyte migration into atherosclerotic plaque.  

PubMed

Adaptive immunity is involved in the pathogenesis of atherosclerosis, but the recruitment of T and B lymphocytes to atherosclerotic lesions is not as well studied as that of monocytes. In this review, we summarize the current understanding of the role of lymphocyte subsets in the pathogenesis of atherosclerosis and discuss chemokines and chemokine receptors involved in lymphocyte homing to atherosclerotic lesions. We review evidence for involvement of the chemokines CCL5, CCL19, CCL21, CXCL10, and CXCL16 and macrophage migration inhibitory factor in lymphocyte homing in atherosclerosis. Also, we review the role of their receptors CCR5, CCR6, CCR7, CXCR3, CXCR6, and CXCR2/CXCR4 and the role of the L-selectin in mouse models of atherosclerosis. PMID:25301842

Li, Jie; Ley, Klaus

2015-01-01

60

Monocyte and macrophage heterogeneity  

Microsoft Academic Search

Heterogeneity of the macrophage lineage has long been recognized and, in part, is a result of the specialization of tissue macrophages in particular microenvironments. Circulating monocytes give rise to mature macrophages and are also heterogeneous themselves, although the physiological relevance of this is not completely understood. However, as we discuss here, recent studies have shown that monocyte heterogeneity is conserved

Philip R. Taylor; Siamon Gordon

2005-01-01

61

Mitogenic signal transduction in T lymphocytes in microgravity  

NASA Technical Reports Server (NTRS)

The activation by concanavalin A Con A of human peripheral blood lymphocytes (PBLs) in the presence of monocytes as accessory cells was investigated in cultures exposed to microgravity conditions in Spacelab. Activation of T cells was measured as incorporation of [3H]thymidine into DNA, secretion of interleukin-2 (IL-2), and interferon-gamma, and expression of IL-2 receptors. Whereas, as discovered in earlier experiments, the activation of resuspended T cells is strongly inhibited, activation of cells attached to microcarrier beads is more than doubled in microgravity. The results suggest that the depression of the activation in resuspended cells may be attributed to a malfunction of monocytes acting as accessory cells. In fact, although the ultrastructure of resuspended monocytes is not altered in microgravity, the secretion of IL-1 is strongly inhibited. Our data suggest that (1) IL-2 is produced independently of IL-1, (2) IL-1 production is triggered only when monocytes (and lymphocytes?) adhere to microcarriers, (3) the expression of IL-2 receptors depends on IL-1, and (4) provided sufficient IL-1 is available, activation is enhanced in microgravity. Finally, cultures of resuspended PBLs and monocytes in microgravity constitute a complete and natural system in which monocytes are not operational. This may be useful for studies of the role of accessory cells and cell-cell interactions in T lymphocyte activation.

Cogoli, A.; Bechler, B.; Cogoli-Greuter, M.; Criswell, S. B.; Joller, H.; Joller, P.; Hunzinger, E.; Muller, O.

1993-01-01

62

Recombinant Human Interferon-inducible Protein 10 Is a Chemoattractant for Human Monocytes and T Lymphocytes and Promotes T Cell Adhesion to Endothelial Cells  

Microsoft Academic Search

Summary The human cytokine interferon-inducible protein 10 (IP-10) is a small glycoprotein secreted by activated T cells, monocytes, endothelial cells, and keratinocytes, and is structurally related to a family of chemotactic cytokines called chemokines. Although this protein is present in sites of delayed-type hypersensitivity reactions and lepromatous leprosy lesions, the biological activity of IP-10 remains unknown. We report here that

Dennis D. Taub; Andrew R. Lloyd; Kevin Conlon; Ji Ming Wang; John R. Ortaldo; Akihisha Harada; Kouji Matsushima; David J. Kelvin; Joost J. Oppenheim

63

A New Prognostic Score for Elderly Patients with Diffuse Large B-Cell Lymphoma Treated with R-CHOP: The Prognostic Role of Blood Monocyte and Lymphocyte Counts Is Absent  

PubMed Central

Background Absolute lymphocyte count (ALC) and absolute monocyte count (AMC) have been documented as independent predictors of survival in patients with newly diagnosed Diffuse Large B-cell Lymphoma (DLBCL). Analysis of the prognostic impact of ALC and AMC in the context of International Prognostic Index (IPI) and other significant variables in elderly population treated in the R-CHOP regime has not been carried out yet. Methodology/Principal Findings In this retrospective study, a cohort of 443 newly diagnosed DLBCL patients with age ?60 was analyzed. All patients were treated with the R-CHOP therapy. An extensive statistical analysis was performed to identify risk factors of 3-year overall survival (OS). In multivariate analysis, only three predictors proved significant: Eastern Cooperative Oncology Group performance status (ECOG), age and bulky disease presence. These predictors were dichotomized (ECOG ?1, age ?70, bulk ?7.5) to create a novel four-level score. This score predicted 3-year OS of 94.0%, 77.4%, 62.7% and 35.4% in the low-, low-intermediate, high-intermediate and high-risk groups, respectively (P<0.001). Further, a three-level score was tested which stratifies the population better (3-year OS: 91.9%, 67.2%, 36.2% in the low, intermediate and high-risk groups, respectively) but is more difficult to interpret. Both the 3- and 4-level scores were compared to standard scoring systems and, in our population, were shown to be superior in terms of patients risk stratification with respect to 3-year OS prediction. The results were successfully validated on an independent cohort of 162 patients of similar group characteristics. Conclusions The prognostic role of baseline ALC, AMC or their ratio (LMR) was not confirmed in the multivariate context in elderly population with DLBCL treated with R-CHOP. The newly proposed age-specific index stratifies the elderly population into risk groups more precisely than the conventional IPI and its existing variants. PMID:25058337

Procházka, Vít; Pytlík, Robert; Janíková, Andrea; Belada, David; Šálek, David; Papajík, Tomáš; Campr, Vít; Fürst, Tomáš; Furstova, Jana; Trn?ný, Marek

2014-01-01

64

Pathology Case Study: Chronic Lymphocytic Leukemia (CLL) and Malignant Melanoma  

NSDL National Science Digital Library

The Department of Pathology at the University of Pittsburgh Medical Center has compiled a wide range of pathology case studies to aid students and instructors in the medical/health science field. This specific case documents the condition of a 74 year-old man suspected of having either chronic lymphocytic leukemia or malignant melanoma. The patientâ??s history, images from his bone marrow biopsy, and final diagnosis are provided in this case for your review. Students will find this resource especially helpful, as it provides experience with patient history, lab results, and diagnostics.

Callahan, Debra L.

65

Prion protein induced signaling cascades in monocytes  

SciTech Connect

Prion proteins play a central role in transmission and pathogenesis of transmissible spongiform encephalopathies. The cellular prion protein (PrP{sup C}), whose physiological function remains elusive, is anchored to the surface of a variety of cell types including neurons and cells of the lymphoreticular system. In this study, we investigated the response of a mouse monocyte/macrophage cell line to exposure with PrP{sup C} fusion proteins synthesized with a human Fc-tag. PrP{sup C} fusion proteins showed an attachment to the surface of monocyte/macrophages in nanomolar concentrations. This was accompanied by an increase of cellular tyrosine phosphorylation as a result of activated signaling pathways. Detailed investigations exhibited activation of downstream pathways through a stimulation with PrP fusion proteins, which include phosphorylation of ERK{sub 1,2} and Akt kinase. Macrophages opsonize and present antigenic structures, contact lymphocytes, and deliver cytokines. The findings reported here may become the basis of understanding the molecular function of PrP{sup C} in monocytes and macrophages.

Krebs, Bjarne [Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich, Muenchen (Germany); Dorner-Ciossek, Cornelia [CNS Research III, Boehringer Ingelheim Pharma GmbH and Co KG, Biberach/Riss (Germany); Schmalzbauer, Ruediger [Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich, Munich (Germany); Vassallo, Neville [Department of Physiology and Biochemistry, University of Malta, Msida (Malta); Herms, Jochen [Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich, Munich (Germany); Kretzschmar, Hans A. [Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich, Munich (Germany)]. E-mail: Hans.Kretzschmar@med.uni-muenchen.de

2006-02-03

66

Interactions between comorbidity and treatment of chronic lymphocytic leukemia: results of German Chronic Lymphocytic Leukemia Study Group trials.  

PubMed

This study investigated the impact of comorbidity in 555 patients with chronic lymphocytic leukemia enrolled in two trials of the German Chronic Lymphocytic Leukemia Study Group on first-line treatment with fludarabine plus cyclophosphamide, fludarabine, or chlorambucil. Patients with two or more comorbidities and patients with less than two comorbidities differed in overall survival (71.7 versus 90.2 months; P<0.001) and progression-free survival (21.0 versus 31.5 months; P<0.01). After adjustment for other prognostic factors and treatment, comorbidity maintained its independent prognostic value in a multivariate Cox regression analysis. Chronic lymphocytic leukemia was the major cause of death in patients with two or more comorbidities. Disease control in patients with two or more comorbidities was better with fludarabine plus cyclophosphamide than with fludarabine treatment, but not with fludarabine compared to chlorambucil treatment. These results give insight into interactions between comorbidity and therapy of chronic lymphocytic leukemia and suggest that durable control of the hematologic disease is most critical to improve overall outcome of patients with increased comorbidity. The registration numbers of the trials reported are NCT00276848 and NCT00262795. PMID:24584349

Goede, Valentin; Cramer, Paula; Busch, Raymonde; Bergmann, Manuela; Stauch, Martina; Hopfinger, Georg; Stilgenbauer, Stephan; Döhner, Hartmut; Westermann, Anne; Wendtner, Clemens M; Eichhorst, Barbara; Hallek, Michael

2014-06-01

67

TRANSFORMATION OF MONOCYTES IN TISSUE CULTURE INTO MACROPHAGES, EPITHELIOID CELLS, AND MULTINUCLEATED GIANT CELLS: An Electron Microscope Study  

Microsoft Academic Search

The scqucntial transformation of chickcn monocytcs into macrophages, cpithelioid cells, and multinucleatcd giant cells in vitro was studied by electron microscopy after fixation and cmbcdment in situ. The following changes occur. In the nucleus, margination of chro- matin, cvidcnt in monocytes, decreases in later forms. Nucleoli become more complcx and nuclear pores increase in number. In cytoplasm, a progressive increase

JERRY S. SUTTON; LEON WEISS

1966-01-01

68

Monocyte function in cirrhosis.  

PubMed Central

Monocyte function has been studied in a total of 51 patients with biopsy-proven cirrhosis and 35 controls. There was significantly reduced monocyte spreading (p less than 0.05), chemotaxis (p less than 0.02), bacterial phagocytosis (p less than 0.05) and bacterial killing (p less than 0.02) in the cirrhotics compared to the controls. Monocytes from patients with cirrhosis produced significantly less of the lysosomal enzymes N-acetyl beta-glucosaminidase and beta-glucuronidase than those obtained from the controls (p less than 0.02). There was no significant difference in the number of monocytes obtained, the number of macrophage precursors, and the nitro-blue tetrazoline (NBT) reduction between the cirrhotic and the controls. The reduced function appeared to be mainly due to a circulating inhibitory factor and could be corrected by incubation of the cirrhotic cells in serum from control subjects. The response of monocytes from patients with cirrhosis did not differ from the controls in their response to added endotoxin or latex particles suggesting that they are capable of a normal response in the absence of the inhibitory factor. Paired specimens of portal and systemic serum were collected from patients with no evidence of liver disease undergoing vascular surgery. When added to normal human monocytes the portal serum caused a significant reduction in bacterial killing (p less than 0.02) and chemotaxis (p less than 0.05) compared to results obtained in the paired systemic serum. Mixing experiments suggests the presence of an active inhibitor in the portal serum. The results suggest that monocyte function is reduced in cirrhosis apparently due to a serum inhibitor which may have originated from the portal vein. The abnormalities may account in part for the increased susceptibility of these patients to infection. PMID:7119129

Holdstock, G; Leslie, B; Hill, S; Tanner, A; Wright, R

1982-01-01

69

Human serum amyloid P component binds to peripheral blood monocytes.  

PubMed

The binding of human serum amyloid P component (SAP) to blood cells and monocyte-derived dendritic cells was investigated by flow cytometry. Monocytes bound biotinylated SAP with avidity in a dose-dependent and saturable manner. By contrast, the binding of SAP to monocyte-derived dendritic cells was weak. No binding to erythrocytes, NK cells, T lymphocytes or B lymphocytes could be detected. The SAP-monocyte interaction was calcium-independent and readily inhibited by C1q. SAP was nonmitogenic for human mononuclear cells and had no apparent influence on lymphocyte proliferation induced by mitogenic lectins. We speculate that binding of SAP by monocytes could be of physiological relevance at extravascular sites by influencing complement regulation. PMID:16784490

Macdonald, S L; Kilpatrick, D C

2006-07-01

70

Effect of salmonella-infected human monocytes on natural killer cell cytotoxicity. In vitro studies  

Microsoft Academic Search

Various chemicals, including some bacteria-derived components, modulate natural killer cell (NKC) activity. We have analyzed the effect of wild-type Ty2 and of mutant strain TYT1231 Salmonella typhi-infected monocytes (U937 cells and human autologous monocytes) on NKC cytotoxicity of peripheral blood mononuclear cell (PBMC) and highly purified NKC (HPNKC; CD16+\\/56+>95%; the rest corresponding to CD3+ T-cells).PBMC's co-culture with either S. typhi

Luz Blanco; Javier Puente; Carolina Carrasco; Dante Miranda; Marion E Wolf; Aron D Mosnaim

2001-01-01

71

Interferon-Beta Induces Distinct Gene Expression Response Patterns in Human Monocytes versus T cells  

PubMed Central

Background Monocytes, which are key players in innate immunity, are outnumbered by neutrophils and lymphocytes among peripheral white blood cells. The cytokine interferon-? (IFN-?) is widely used as an immunomodulatory drug for multiple sclerosis and its functional pathways in peripheral blood mononuclear cells (PBMCs) have been previously described. The aim of the present study was to identify novel, cell-specific IFN-? functions and pathways in tumor necrosis factor (TNF)-?-activated monocytes that may have been missed in studies using PBMCs. Methodology/Principal Findings Whole genome gene expression profiles of human monocytes and T cells were compared following in vitro priming to TNF-? and overnight exposure to IFN-?. Statistical analyses of the gene expression data revealed a cell-type-specific change of 699 transcripts, 667 monocyte-specific transcripts, 21 T cell-specific transcripts and 11 transcripts with either a difference in the response direction or a difference in the magnitude of response. RT-PCR revealed a set of differentially expressed genes (DEGs), exhibiting responses to IFN-? that are modulated by TNF-? in monocytes, such as RIPK2 and CD83, but not in T cells or PBMCs. Known IFN-? promoter response elements, such as ISRE, were enriched in T cell DEGs but not in monocyte DEGs. The overall directionality of the gene expression regulation by IFN-? was different in T cells and monocytes, with up-regulation more prevalent in T cells, and a similar extent of up and down-regulation recorded in monocytes. Conclusions By focusing on the response of distinct cell types and by evaluating the combined effects of two cytokines with pro and anti-inflammatory activities, we were able to present two new findings First, new IFN-? response pathways and genes, some of which were monocytes specific; second, a cell-specific modulation of the IFN-? response transcriptome by TNF-?. PMID:23626809

Henig, Noa; Avidan, Nili; Mandel, Ilana; Staun-Ram, Elsebeth; Ginzburg, Elizabeta; Paperna, Tamar; Pinter, Ron Y.; Miller, Ariel

2013-01-01

72

Appendix E: Study Protocol Protocol for Biosampling Children with Leukemia (Acute Lymphocytic and  

E-print Network

Appendix E: Study Protocol Protocol for Biosampling Children with Leukemia (Acute Lymphocytic and Acute Myelocytic Leukemias) plus a Comparison Population in Sierra Vista, Arizona The protocol Assessment of Case Children with Leukemia (Acute Lymphocytic and Acute Myelocytic Leukemias) and a Reference

73

Enhanced expression of human monocyte complement (C3b) receptors by chemoattractants.  

PubMed Central

The capacity of various leucoattractants to enhance, or unfold, receptors for complement (C3b) on human blood monocytes has been studied. A number of recognized monocyte chemoattractants including casein, supernatants from C. parvum 10390 and from human lymphocytes (cultured either in the presence or absence of phytohaemagglutinin) and the formyl-methionyl peptides, F-Met-Leu-Phe, F-Met-Met-Phe and F-Met-Phe, increased the percentage of monocytes which formed rosettes with IgM-sensitized sheep erythrocytes coated with complement. Comparable results were achieved irrespective of whether purified components of whole serum was used as a source of complement. In contrast, there was no significant increase in EAG (Fc) rosettes with those doses of casein which gave enhancement of C3b receptors. A small degree of complement receptor enhancement was observed with histamine but the unformylated peptides, Met-Leu-Phe and Met-Met-Phe, were without apparent effect. Maximal receptor enhancement was obtained at 30 min but when the leucoattractant was removed, enhancement was reversible, returning to normal values in approximately 120 min. Monocyte complement receptor enhancement increased with temperatures between 0 degrees C and 37 degrees C. These data (1) confirm and extend our previous findings on leucoattractant-induced enhancement of complement receptors on human monocytes; (2) indicate that the phenomenon may have potential as a clinical test for monocyte function both in health and disease. PMID:7379336

Glass, E J; Kay, A B

1980-01-01

74

Upregulation and atypical expression of the CD1 molecules on monocytes in sickle cell disease.  

PubMed

Human CD1 group I molecules CD1a, b, and c are expressed on antigen-presenting cells, notably dendritic cells, and implicated in glycolipids presentation to T lymphocytes. Expression of CD1 on monocytes is a hallmark of their activation. Because monocyte activation has been reported during steady state disease in sickle cell anemia (SCA) patients, we have analyzed CD1 expression on monocytes from 45 SCA patients originating from Africa and 27 healthy control subjects. CD1 expression was detected on monocytes in the majority of SCA patients (75%), whereas it was not observed in the vast majority of the control group (70.4%). CD1b and CD1c were highly expressed in Sbeta thalassemia patients and CD1a expression was predominant in SDPunjab patients. This expression of the CD1 molecules is correlated with an increased expression of the major histocompatibility complex class II invariant chain (CD74). Finally, we have observed that the majority of SCA patients (68%) express only two or one CD1 isoforms. This study demonstrates the particular phenotype of SCA monocytes intermediate between normal resting and activated monocytes, a phenotype that could have consequences on regulation of the infection outcome. PMID:15556687

Sloma, Ivan; Zilber, Marie-Thérèse; Charron, Dominique; Girot, Robert; Tamouza, Ryad; Gelin, Catherine

2004-11-01

75

Study of splenic irradiation in chronic lymphocytic leukemia  

SciTech Connect

A retrospective study was performed to assess the effect of splenic irradiation (SI) on splenomegaly, splenic pain, anemia, and thrombocytopenia in patients with chronic lymphocytic leukemia. Twenty-two patients received 32 courses of SI. Of 31 courses of SI given for splenomegaly there were 19 responders (61%). Ten courses of SI were given for splenic pain resulting in partial relief of pain in 4 courses and complete relief in 4 courses. Only 4 of 16 courses given for anemia resulted in elevations of hemoglobin of 2 g/dL or more. Of the 14 courses of SI given for thrombocytopenia there were only 2 responses with platelet counts decreasing further in another 9 courses. The median duration of response was 14 months (range: 3-116 months). There was no dose-response relationship detected for SI in CLL. Treatment related toxicity was hematologic and secondary to leucopenia and thrombocytopenia. We recommend the use of small fraction sizes of 25 cGy to 50 cGy and close monitoring of hematological parameters. Splenic irradiation effectively palliates splenomegaly and reduces spleen size in CLL. It was of limited value in correcting anemia and thrombocytopenia in this patient population.

Guiney, M.J.; Liew, K.H.; Quong, G.G.; Cooper, I.A.

1989-01-01

76

Lymphocytic choriomeningitis infection in the nude mouse. An immunopathological study.  

PubMed Central

Immunopathological studies of the kidney, determination of circulating immune complexes and interferon blood levels were obtained in adult congenitally-athymic nude mice ((nu/nu) infected with lymphocyte choriomeningitis (LCM) virus as well as in their phenotypically-normal litter mates (nu/+). As previously reported, intracerebral or intraperitoneal infection in nu/nu mice did not induce any mortality and resulted in a carrier state characterized by persistently high levels of virus in the circulation. Interferon was present in the circulation for approximately 6 days. Circulating immune complexes were not detectable and glomerulonephritis assessed by light microscopy, electron microscopy and immunofluorescence, was either absent or very mild. These observations show that although a carrier state can be induced in adult nude mice, circulating immune complexes and glomerulonephritis do not develop. This situation is markedly different from that induced in normal Swiss mice infected at birth, which is characterized by raised levels of circulating immune complexes and development of glomerulonephritis in all infected mice. PMID:6168566

Ronco, P; Rivière, Y; Thoua, Y; Bandu, M T; Guillon, J C; Verroust, P; Morel-Maroger, L

1981-01-01

77

Dietary factors and risk of chronic lymphocytic leukemia and small lymphocytic lymphoma: a pooled analysis of two prospective studies  

PubMed Central

Background Other than male sex, family history, advanced age, and race, risk factors for chronic lymphocytic leukemia and small lymphocytic lymphoma (CLL/SLL) are unknown. Very few studies have investigated diet in relation to these leukemias, and no consistent associations are known. Methods Using two large prospective population-based studies, we evaluated the relationship between diet and CLL/SLL risk. Among 525,982 men and women free of cancer at enrollment, we identified 1,129 incident CLL/SLL cases during 11.2 years of follow-up. Results We found no associations between total fat, saturated fat, fiber, red meat, processed meat, fruit or vegetable intake and risk of CLL/SLL. We noted a suggestive positive association between body mass index (BMI) and CLL/SLL (hazard ratio =1.30; 95% confidence interval= 0.99-1.36). Conclusion We did not find any associations between foods or nutrients and CLL/SLL. Impact Our large prospective study indicates that diet may not play a role in CLL/SLL development. PMID:20929883

Tsai, Huei-Ting; Cross, Amanda J.; Graubard, Barry I.; Oken, Martin; Schatzkin, Arthur; Caporaso, Neil E.

2010-01-01

78

Changes in T-Cell and Monocyte Phenotypes In Vitro by Schistosoma mansoni Antigens in Cutaneous Leishmaniasis Patients.  

PubMed

High levels of proinflammatory cytokines such as IFN-? and TNF are associated with tissue lesions in cutaneous leishmaniasis (CL). We previously demonstrated that Schistosoma mansoni antigens downmodulate the in vitro cytokine response in CL. In the current study we evaluated whether S. mansoni antigens alter monocyte and T-lymphocyte phenotypes in leishmaniasis. Peripheral blood mononuclear cells of CL patients were cultured with L. braziliensis antigen in the presence or absence of the S. mansoni antigens rSm29, rSmTSP-2- and PIII. Cells were stained with fluorochrome conjugated antibodies and analyzed by flow cytometry. The addition of rSm29 to the cultures decreased the expression of HLA-DR in nonclassical (CD14(+)CD16(++)) monocytes, while the addition of PIII diminished the expression of this molecule in classical (CD14(++)CD16(-)) and intermediate (CD14(++)CD16(+)) monocytes. The addition of PIII and rSmTSP-2 resulted in downmodulation of CD80 expression in nonclassical and CD86 expression in intermediate monocytes, respectively. These two antigens increased the expression of CTLA-4 in CD4(+) T cells and they also expanded the frequency of CD4(+)CD25(high)Foxp3(+) T cells. Taken together, we show that S. mansoni antigens, mainly rSmTSP-2 and PIII, are able to decrease the activation status of monocytes and also to upregulate the expression of modulatory molecules in T lymphocytes. PMID:23209879

Bafica, Aline Michelle Barbosa; Cardoso, Luciana Santos; Oliveira, Sérgio Costa; Loukas, Alex; Góes, Alfredo; Oliveira, Ricardo Riccio; Carvalho, Edgar M; Araujo, Maria Ilma

2012-01-01

79

Protease inhibitor monotherapy is associated with a higher level of monocyte activation, bacterial translocation and inflammation  

PubMed Central

Introduction Monotherapy with protease-inhibitors (MPI) may be an alternative to cART for HIV treatment. We assessed the impact of this strategy on immune activation, bacterial translocation and inflammation. Methods We performed a cross-sectional study comparing patients on successful MPI (n=40) with patients on cART (n=20). Activation, senescence, exhaustion and differentiation stage in CD4+ and CD8+ T lymphocyte subsets, markers of monocyte activation, microbial translocation, inflammation, coagulation and low-level viremia were assessed. Results CD4+ or CD8+ T lymphocyte subset parameters were not significantly different between both groups. Conversely, as compared with triple cART, MPI patients showed a higher proportion of activated monocytes (CD14+ CD16?CD163+ cells, p=0.031), soluble markers of monocyte activation (sCD14 p=0.004, sCD163 p=0.002), microbial translocation (lipopolysaccharide (LPS)-binding protein; LBP p=0.07), inflammation (IL-6 p=0.04) and low-level viremia (p=0.035). In a multivariate model, a higher level of CD14+ CD16?CD163+ cells and sCD14, and presence of very low-level viremia were independently associated with MPI. Monocyte activation was independently associated with markers of inflammation (IL-6, p=0.006), microbial translocation (LBP, p=0.01) and low-level viremia (p=0.01). Conclusions Patients on MPI showed a higher level of monocyte activation than patients on standard therapy. Microbial translocation and low-level viremia were associated with the high level of monocyte activation observed in patients on MPI. The long-term clinical consequences of these findings should be assessed. PMID:25280865

Torres, Berta; Guardo, Alberto C; Leal, Lorna; Leon, Agathe; Lucero, Constanza; Alvarez-Martinez, Míriam J; Martinez, Miguel J; Vila, Jordi; Martínez-Rebollar, María; González-Cordón, Ana; Gatell, Josep M; Plana, Montserrat; García, Felipe

2014-01-01

80

The interleukin-6 promoter polymorphism is associated with elevated leukocyte, lymphocyte, and monocyte counts and reduced physical fitness in young healthy smokers  

Microsoft Academic Search

Smoking and interleukin-6 are important factors in driving inflammation. This study assessed the relationship between smoking, interleukin-6 genotype, physical fitness, and peripheral blood count in healthy young men. For this interleukin-6 promoter polymorphism -174 genotype-phenotype association study 1,929 healthy German male aviators recruited at the central German Air Force Institute of Aviation Medicine were stratified by smoking habits. Cardiovascular fitness

J. R. Ortlepp; J. Metrikat; K. Vesper; V. Mevissen; F. Schmitz; M. Albrecht; P. Maya-Pelzer; P. Hanrath; C. Weber; K. Zerres; R. Hoffmann

2003-01-01

81

Experimental Study on Effect of Simulated Microgravity on Structural Chromosome Instability of Human Peripheral Blood Lymphocytes  

PubMed Central

Experimental study was made by keeping human peripheral blood lymphocytes under simulated microgravity in a Rotary Cell Culture System bioreactor to investigate the changes that occur in the number of chromosomes, the expression rate of chromosome fragile site, and the expressions of DNA replication- and repair-related genes. Experimental results indicate simulated microgravity has no effect on the numerical chromosome instability of human peripheral blood lymphocytes, but it enhances the structural chromosome instability of human peripheral blood lymphocytes through the inhibition of DNA replication and the reduction of DNA repair. So, the mechanism of chromosome fragile site induced by simulated microgravity can be explained using the changes that occur in the chromosome structure of human peripheral blood lymphocytes, the DNA replication and repair under the effect of simulated microgravity. PMID:24963972

Wei, Lijun; Liu, Chuanpeng; Kang, Li; Liu, Yufeng; Shi, Shuliang; Wu, Qiong; Li, Yu

2014-01-01

82

Lymphocytic colitis: a retrospective clinical study of 199 Swedish patients  

PubMed Central

Background: Lymphocytic colitis is characterised by chronic diarrhoea and specific microscopic changes in a macroscopically normal colonic mucosa. We report clinical features and treatment outcome in a large patient cohort. Methods: Patients were searched for in 24 Swedish gastroenterology clinics. The biopsy material was reassessed using strict histopathological criteria. Clinical data were obtained from medical notes. Results: Lymphocytic colitis was diagnosed in 199 cases. The female:male ratio was 2.4:1. Median age at diagnosis was 59 (48–70) years. The most frequent symptoms were diarrhoea (96%), abdominal pain (47%), and weight loss (41%). The course was chronic intermittent in 30% of patients, chronic continuous in 7%, and a single attack in 63%, and in these cases the disease duration was 6 (4–11) months. Seventy nine (40%) patients reported associated diseases, of which thyroid disorders, coeliac disease, and diabetes mellitus were the most common. In 34 first or second degree relatives of 24 (12%) patients, a family history of ulcerative colitis, Crohn’s disease, collagenous colitis, or coeliac disease was reported. Drug induced disease was suspected in 19 (10%) patients. A non-significant peak of disease onset was seen in December-January. More than 80% of treated patients improved on corticosteroids, including budesonide. Conclusions: A family history of other bowel disorders is a new finding. The sudden onset and single attack of limited duration may support a possible infectious cause in some cases. Drugs may cause lymphocytic colitis. PMID:15016748

Olesen, M; Eriksson, S; Bohr, J; Järnerot, G; Tysk, C

2004-01-01

83

Immunologic Effector Mechanisms of a Standardized Mistletoe Extract on the Function of Human Monocytes and Lymphocytes in vitro , ex vivo , and in vivo  

Microsoft Academic Search

Even though mistletoe extracts have been in clinical use for centuries their exact mode of action is still unknown. Currently, the application scheme for registered preparations is a dose-escalating scheme to thus reduce side effects. In this study, healthy controls and patients were evaluated for their immunologic response to treatment with a standardized mistletoe extract (Iscador). It shows a strong

Lucie Heinzerling; Volker Von Baehr; Christa Liebenthal; RÜdiger Von Baehr; Hans-Dieter Volk

2006-01-01

84

[Selected lymphocyte subsets in Lime borreliosis: a preliminary study].  

PubMed

Observation of percentages changes of lymphocytes (CD19), T(CD3), subsets CD4, CD8, NK cells, activated lymphocytes with fenotype CD3+HLA-DR, CD4/CD8 rate in Lyme borreliosis was carried out before (I examination) and after antibioticotherapy (II examination). 30 patients in aged 17-60 (x = 41) with recognition of erythema migrans(EM), Lyme arthritis(LA) and neuroborreliosis(NB) were examined. Epidemiological, clinical diagnosis was confirm by the presence of antibodies in ELISA test. Lymphocytes and their subsets, NK cells were signed and measured by flow cytometric immunophenotyping in Coulter EPIX XL with Becton-Dickinson antibodies twice: before and after treatment. Ampicillin, ceftriaxon or cefotaxim was applied during 4 weeks. AnStat program was used in statistic analysis. Value CD3 (x = 72.54) in I test was higher than control (x = 69.3), but CD19 (x = 13.2) was lower than control (x = 12.9). In II examination we stated CD19 (x = 9.48) progressive significant decreased in comparison to I examination. Percentage CD4 in II examination (x = 42) was lower than control (x = 45.8). Subset of CD8 had lower value in I examination (x = 28.03), as in II (x = 30.72) in comparison with control (x = 34.2). We showed lower CD4/CD8 (x = 1.40) rate after treatment than control (x = 2.67). We showed lower percentage NK cells after treatment (x = 13.5) than control. We also found lower percentage activated subsets T cells with phenotype CD3+HLA-DR before (x = 4.78) and after treatment (x = 4.03) compared with control (x = 7.27). No statistical changes in subsets with receptor for IL-2 before and after treatment was shown. In the course of active infection B.burgdorferi essential changes in lymphocytes subsets are observed. Decreased percentages of CD4, CD8, NK and CD3+HLA-DR+ in whole blood indicate their important role in immunopathogenesis of Lyme borreliosis. Lack of normalization of investigated parameters after treatment can be caused by inertion of elements immunologic system, as well as too short antibioticotherapies. PMID:10437395

Zajkowska, J M; Hermanowska-Szpakowicz, T; Kasprzycka, E

1999-05-01

85

Standardized flow cytometry assay for identification of human monocytic heterogeneity and LRP1 expression in monocyte subpopulations: decreased expression of this receptor in nonclassical monocytes.  

PubMed

In this article, we present a flow cytometry assay by which human blood monocyte subpopulations-classical (CD14(++) CD16(-)), intermediate (CD14(++) CD16(+)), and nonclassical (CD14(+) CD16(++)) monocytes-can be determined. Monocytic cells were selected from CD45(+) leukocyte subsets by differential staining of the low-density lipoprotein receptor-related protein 1 (LRP1), which allows reducing the spill-over of natural killer cells and granulocytes into the CD16(+) monocyte gate. Percentages of monocyte subpopulations established by this procedure were significantly comparable with those obtained by a well-standardized flow cytometry assay based on the HLA-DR monocyte-gating strategy. We also demonstrated that LRP1 is differentially expressed at cell surface of monocyte subpopulations, being significantly lower in nonclassical monocytes than in classical and intermediate monocytes. Cell surface expression of LRP1 accounts for only 20% of the total cellular content in each monocyte subpopulation. Finally, we established the within-individual biological variation (bCV%) of circulating monocyte subpopulations in healthy donors, obtaining values of 21%, 20%, and 17% for nonclassical, intermediate, and classical monocytes, respectively. Similar values of bCV% for LRP1 measured in each monocyte subpopulation were also obtained, suggesting that its variability is mainly influenced by the intrinsic biological variation of circulating monocytes. Thus, we conclude that LRP1 can be used as a third pan-monocytic marker together with CD14 and CD16 to properly identify monocyte subpopulations. The combined determination of monocyte subpopulations and LRP1 monocytic expression may be relevant for clinical studies of inflammatory processes, with special interest in atherosclerosis and cardiovascular disease. PMID:24639232

Ferrer, Darío G; Jaldín-Fincati, Javier R; Amigone, José L; Capra, Raul H; Collino, César J; Albertini, Ricardo A; Chiabrando, Gustavo A

2014-07-01

86

HIV-1 Latency in Monocytes/Macrophages  

PubMed Central

Human immunodeficiency virus type 1 (HIV-1) targets CD4+ T cells and cells of the monocyte/macrophage lineage. HIV pathogenesis is characterized by the depletion of T lymphocytes and by the presence of a population of cells in which latency has been established called the HIV-1 reservoir. Highly active antiretroviral therapy (HAART) has significantly improved the life of HIV-1 infected patients. However, complete eradication of HIV-1 from infected individuals is not possible without targeting latent sources of infection. HIV-1 establishes latent infection in resting CD4+ T cells and findings indicate that latency can also be established in the cells of monocyte/macrophage lineage. Monocyte/macrophage lineage includes among others, monocytes, macrophages and brain resident macrophages. These cells are relatively more resistant to apoptosis induced by HIV-1, thus are important stable hideouts of the virus. Much effort has been made in the direction of eliminating HIV-1 resting CD4+ T-cell reservoirs. However, it is impossible to achieve a cure for HIV-1 without considering these neglected latent reservoirs, the cells of monocyte/macrophage lineage. In this review we will describe our current understanding of the mechanism of latency in monocyte/macrophage lineage and how such cells can be specifically eliminated from the infected host. PMID:24759213

Kumar, Amit; Abbas, Wasim; Herbein, Georges

2014-01-01

87

Lipoprotein lipase can function as a monocyte adhesion protein.  

PubMed

Lipoprotein lipase (LPL) is made by several cell types, including macrophages within the atherosclerotic lesion. LPL, a dimer of identical subunits, has high affinity for heparin and cell surface heparan sulfate proteoglycans (HSPGs). Several studies have shown that cell surface HSPGs can mediate cell binding to adhesion proteins. Here, we tested whether LPL, by virtue of its HSPG binding could mediate monocyte adhesion to surfaces. Monocyte binding to LPL-coated (1-25 micrograms/mL) tissue culture plates was 1.4- to 7-fold higher than that of albumin-treated plastic. Up to 3-fold more monocytes bound to the subendothelial matrix that had been pretreated with LPL. LPL also doubled the number of monocytes that bound to endothelial cells (ECs). Heparinase and heparitinase treatment of monocytes or incubation of monocytes with heparin decreased monocyte binding to LPL. Heparinase/heparitinase treatment of the matrix also abolished the LPL-mediated increase in monocyte binding. These results suggest that LPL dimers mediate monocyte binding by forming a "bridge" between matrix and monocyte surface HSPGs. Inhibition of LPL activity with tetrahydrolipstatin, a lipase active-site inhibitor, did not affect the LPL-mediated monocyte binding. To assess whether specific oligosaccharide sequences in HSPGs mediated monocyte binding to LPL, competition experiments were performed by using known HSPG binding proteins. Neither antithrombin nor thrombin inhibited monocyte binding to LPL. Next, we tested whether integrins were involved in monocyte binding to LPL. Surprisingly, monocyte binding to LPL-coated plastic and matrix was inhibited by approximately 35% via integrin-binding arginine-glycine-aspartic acid peptides. This result suggests that monocyte binding to LPL was mediated, in part, by monocyte cell surface integrins. In summary, our data show that LPL, which is present on ECs and in the subendothelial matrix, can augment monocyte adherence. This increase in monocyte-matrix interaction could promote macrophage accumulation within arteries. PMID:9261275

Obunike, J C; Paka, S; Pillarisetti, S; Goldberg, I J

1997-07-01

88

Covalently grafted BMP-7 peptide to reduce macrophage/monocyte activity: an in vitro study on cobalt chromium alloy.  

PubMed

Cobalt chromium (CoCr) alloy is widely used in orthopedic implants but its functional longevity is susceptible to inflammation related complications. Reduction of the development of chronic inflammation on the biomaterial surface would enhance direct bone-implant bonding and improve implant survival and long-term results. The BMP-7 peptide was derived from the knuckle epitope of bone morphogenic protein-7 (BMP-7) and was conjugated via a cysteine amino acid at the N-terminus. Mouse RAW 264.7 monocytes/macrophages were seeded on the CoCr substrates and inflammation was induced via lipopolysaccharide (LPS) challenge. The effects of BMP-7 peptide on inflammation were evaluated by measuring the expression of inflammatory markers like toll-like receptor-4 (TLR-4), tumor necrosis factor-? (TNF-?), and monocyte chemotactic protein-1 (MCP-1). ELISA and qPCR assays were used to study the inflammatory signals. BMP-7 signaling pathway activation was shown by the presence of phosphorylation of Smad1/5/8. Utilizing the reactivity of polydopamine films to immobilize BMP-7 peptide onto metal substrates may provide a promising approach for applications in situations where reduction of inflammation around implants would be beneficial in improving surgical outcome, bone healing, and implant integration. PMID:23055400

Tan, Hark Chuan; Poh, Chye Khoon; Cai, Yanli; Soe, Min Thun; Wang, Wilson

2013-03-01

89

Autophagy Protects Monocytes from Wolbachia Heat Shock Protein 60–Induced Apoptosis and Senescence  

PubMed Central

Monocyte dysfunction by filarial antigens has been a major mechanism underlying immune evasion following hyporesponsiveness during patent lymphatic filariasis. Recent studies have initiated a paradigm shift to comprehend the immunological interactions of Wolbachia and its antigens in inflammation, apoptosis, lymphocyte anergy, etc. Here we showed that recombinant Wolbachia heat shock protein 60 (rWmhsp60) interacts with TLR-4 and induces apoptosis in monocytes of endemic normal but not in chronic patients. Higher levels of reactive oxygen species (ROS) induced after TLR-4 stimulation resulted in loss of mitochondrial membrane potential and caspase cascade activation, which are the plausible reason for apoptosis. Furthermore, release in ROS owing to TLR-4 signaling resulted in the activation of NF-?B p65 nuclear translocation which leads to inflammation and apoptosis via TNF receptor pathway following the increase in IL-6 and TNF-? level. Here for the first time, we report that in addition to apoptosis, rWmhsp60 antigen in filarial pathogenesis also induces molecular senescence in monocytes. Targeting TLR-4, therefore, presents a promising candidate for treating rWmhsp60-induced apoptosis and senescence. Strikingly, induction of autophagy by rapamycin detains TLR-4 in late endosomes and subverts TLR-4-rWmhsp60 interaction, thus protecting TLR-4–mediated apoptosis and senescence. Furthermore, rapamycin-induced monocytes were unresponsive to rWmhsp60, and activated lymphocytes following PHA stimulation. This study demonstrates that autophagy mediates the degradation of TLR-4 signaling and protects monocytes from rWmhsp60 induced apoptosis and senescence. PMID:25849993

Kamalakannan, Vijayan; Shiny, Abijit; Babu, Subash; Narayanan, Rangarajan Badri

2015-01-01

90

Chlorobenzenes, lindane and dieldrin induce apoptotic alterations in human peripheral blood lymphocytes (in vitro study).  

PubMed

In this study, we have assessed apoptotic effect of 1,2,4-trichlorobenzene, hexachlorobenzene, lindane and dieldrin on human peripheral blood lymphocytes. We observed an increase in ROS formation and a decrease in mitochondrial transmembrane potential in the cells incubated with low concentrations of all compounds studied, in particular lindane and dieldrin. ROS formation and changes in mitochondrial transmembrane potential may have influenced caspase-3 activation, a crucial enzyme in the apoptotic process. Moreover, chlorobenzenes, and in particular lindane and dieldrin changed cells' membrane permeability and induced phosphatidylserine translocation, which confirmed that they are capable of inducing apoptosis in human lymphocytes. Apoptotic changes in human lymphocytes provoked by biologically relevant concentrations of these substances suggest that they may disturb function of immunological system especially among people occupationally exposed to their action. PMID:24077485

Micha?owicz, Jaromir; Mokra, Katarzyna; Rosiak, Karolina; Sici?ska, Paulina; Bukowska, Bo?ena

2013-11-01

91

Effects of monocyte-endothelium interactions on the expression of type IV collagenases in monocytes  

PubMed Central

The adhesion of monocytes to endothelial cells is one of the early stages in the development of atherosclerosis. The expression of type IV collagenases, which include matrix metalloproteinase (MMP)-2 and MMP-9, in monocytes is hypothesized to play an important role in monocyte infiltration and transformation into foam cells. The aim of the present study was to examine the effects of monocyte-endothelium interactions on the expression levels of type IV collagenases and their specific inhibitors in monocytes, and to investigate the roles of tumor necrosis factor (TNF)-? and interleukin (IL)-1? in this process. Monocytes were single-cultured or co-cultured with endothelial cells. The expression of the type IV collagenases, MMP-2 and MMP-9, and their specific inhibitors, tissue inhibitor of metalloproteinase (TIMP)-1 and TIMP-2, in monocytes was determined by immunohistochemistry followed by image analysis. The expression levels of MMP-2 and MMP-9 were found to be low in the single-culture monocytes, but increased significantly when the monocytes and endothelial cells were co-cultured. However, treatment with monoclonal TNF-? or IL-1? antibodies partially inhibited the upregulated expression of MMP-2 and MMP-9 in the co-cultured monocytes. Expression of TIMP-1 and TIMP-2 was observed in the single monocyte culture, and a small increase in the expression levels was observed when the monocytes were co-cultured with endothelial cells. Therefore, monocyte-endothlium interactions were shown to increase the expression of type IV collagenases in monocytes, resulting in the loss of balance between MMP-2 and -9 with TIMP-1 and -2. In addition, TNF-? and IL-1? were demonstrated to play important roles in this process. PMID:25574228

LI, YONG-QIN; LIU, RUI; XUE, JIA-HONG; ZHANG, YAN; GAO, DENG-FENG; WU, XIAO-SAN; WANG, CONG-XIA; YANG, YU-BAI

2015-01-01

92

Monocyte Subpopulations in Angiogenesis  

PubMed Central

Growing understanding of the role of the tumor microenvironment in angiogenesis has brought monocyte-derived cells into focus. Monocyte subpopulations are an increasingly attractive therapeutic target in many pathologic states, including cancer. Before monocyte-directed therapies can be fully harnessed for clinical use, understanding of monocyte-driven angiogenesis in tissue development and homeostasis, as well as malignancy, is required. Here, we provide an overview of the mechanisms by which monocytic subpopulations contribute to angiogenesis in tissue and tumor development, highlight gaps in our existing knowledge, and discuss opportunities to exploit these cells for clinical benefit. PMID:24556724

Dalton, Heather J.; Armaiz-Pena, Guillermo; Gonzalez-Villasana, Vianey; Lopez-Berestein, Gabriel; Bar-Eli, Menashe; Sood, Anil K.

2014-01-01

93

THE REQUIREMENT FOR LYMPHOCYTE FUNCTION-ASSOCIATED ANTIGEN 1 IN HOMOTYPIC LEUKOCYTE  

E-print Network

aggregation is seen with monocytes (3) and some leukocyte cell lines, including EBV-transformed B lymphocytes of general importance in phorbol ester-stimulated adhesion by lymphocytes and monocytic cells. Materials and Methods Cell Lines. JY EBV-transformed B lymphobl

Springer, Timothy A.

94

Upregulation and atypical expression of the CD1 molecules on monocytes in sickle cell disease  

Microsoft Academic Search

Human CD1 group I molecules CD1a, b, and c are expressed on antigen-presenting cells, notably dendritic cells, and implicated in glycolipids presentation to T lymphocytes. Expression of CD1 on monocytes is a hallmark of their activation. Because monocyte activation has been reported during steady state disease in sickle cell anemia (SCA) patients, we have analyzed CD1 expression on monocytes from

Ivan Sloma; Marie-Thérèse Zilber; Dominique Charron; Robert Girot; Ryad Tamouza; Catherine Gelin

2004-01-01

95

CYTOTOXIC T-LYMPHOCYTE IMMUNOTHERAPY FOR OVARIAN CANCER: A PILOT STUDY  

PubMed Central

The objective was to evaluate the toxicity and feasibility of intraperitoneal (IP) infusion of tumor-specific cytotoxic T-lymphocytes (CTL) as therapy for recurrent ovarian cancer, and to determine if repetitive cycles of CTL generation and infusion measurably increases the host’s ovarian cancer immune response. In this study, seven subjects with recurrent ovarian cancer confined to the peritoneal cavity underwent up to 4 cycles, each cycle beginning with a leukapheresis for collection of precursor lymphocytes, which were stimulated in vitro with MUC1, a tumor-specific antigen found commonly in ovarian cancer cells. The resulting new CTL for each cycle were re-introduced into the host via IP infusion. Immunological parameters (killer cells, cytokine production, memory T-lymphocytes and natural killer (NK) cells) were studied. Toxicity, CA-125, and survival data were also evaluated. The tumor marker CA-125 was non statistically significantly reduced after the first month of immunotherapy. However, after that, it rose. Killer cells, cytokine production and memory T-lymphocytes increased after the first cycle of stimulation, but plateaued or reduced thereafter. The percent of NK cells inversely correlated with other immune parameters. Median survival was 11.5 months. One subject is free of disease since December, 2000. Multiple cycles, beyond one cycle, of T-cell stimulation followed by adoptive T cell infusion, may not enhance the in vivo immune response. PMID:22306908

Wright, Stephen E.; Rewers-Felkins, Kathleen A.; Quinlin, Imelda S.; Phillips, Catherine A.; Townsend, Mary; Philip, Ramila; Dobrzanski, Mark J.; Lockwood-Cooke, Pamela R.; Robinson, William

2012-01-01

96

Safety and Tolerability Study of PCI-32765 in B Cell Lymphoma and Chronic Lymphocytic Leukemia  

ClinicalTrials.gov

B-cell Chronic Lymphocytic Leukemia; Small Lymphocytic Lymphoma; Diffuse Well-differentiated Lymphocytic Lymphoma; B Cell Lymphoma; Follicular Lymphoma,; Mantle Cell Lymphoma; Non-Hodgkin's Lymphoma; Waldenstrom Macroglobulinemia; Burkitt Lymphoma; B-Cell Diffuse Lymphoma

2013-10-30

97

A Suppressor of Cytokine Signaling 1 Antagonist Enhances Antigen-Presenting Capacity and Tumor Cell Antigen-Specific Cytotoxic T Lymphocyte Responses by Human Monocyte-Derived Dendritic Cells  

PubMed Central

The suppressor of cytokine signaling 1 (SOCS1) has emerged as a critical inhibitory molecule for controlling the cytokine response and antigen presentation by dendritic cells (DCs), thereby regulating the magnitude of both innate and adaptive immunity. The aim of this study was to investigate whether the SOCS1 antagonist pJAK2(1001-1013) peptide can weaken or block the inhibition function of SOCS1 in DCs by evaluating the phenotype and cytokine production, antigen-presenting, and specific T-cell-activating capacities of DCs electroporated with human gastric cancer cell total RNA. Furthermore, STAT1 activation of the JAK/STAT signal pathway mediated by SOCS1 was analyzed by Western blotting. The results demonstrate that the SOCS1 antagonist pJAK2(1001-1013) peptide upregulated the expression of the maturation marker (CD83) and costimulatory molecule (CD86) of RNA-electroporated human monocyte-derived mature DCs (mDCs), potentiated the capacity of mDCs to induce T-cell proliferation, stimulated the secretion of proinflammatory cytokines, and enhanced the cytotoxicity of tumor cell antigen-specific CTLs activated by human gastric cancer cell total RNA-electroporated mDCs. Data from Western blot analysis indicate that STAT1 was further activated in pJAK2(1001-1013) peptide-loaded mDCs. These results imply that the SOCS1 antagonist pJAK2(1001-1013) peptide is an effective reagent for the enhancement of antigen-specific antitumor immunity by DCs. PMID:23885028

Wang, Yongjun; Wang, Shengyu; Ding, Yuan; Ye, Yanhua; Xu, Yingyi; He, Huixiang; Li, Qiaozhen; Mi, Yanjun; Guo, Chunhua; Lin, Zhicai; Liu, Tao; Zhang, Yaya

2013-01-01

98

Characterization of canine monocyte-derived dendritic cells with phenotypic and functional differentiation  

PubMed Central

For therapeutic purposes, large numbers of dendritic cells (DCs) are essential. In this study, we used 2% autologous canine plasma, granulocyte/macrophage colony-stimulating factor (GM-CSF), fms-like tyrosine kinase 3 ligand (Flt3L), and interleukin 4 (IL-4) in generating monocyte-derived DCs from peripheral blood mononuclear cells of dogs. The plasma enriched the population of CD14-positive monocytes by greatly enhancing the efficiency of monocyte adherence, the proportion of adherent cells increasing from 6.6% with 10% fetal bovine serum to 15.3% with 2% autologous canine plasma. Culturing the adherent monocytes for 6 d with human GM-CSF, canine IL-4, and human Flt3L significantly increased the yield of DCs, more than 90% of which were CD14-negative. Because, in the presence of lipopolysaccharide (LPS), monocytes that were CD14-positive expressed tumor necrosis factor ? much more than DCs with low levels of CD14, it is important to decrease the numbers of CD14-positive cells in generating monocyte-derived DCs. With flow cytometry and real-time reverse-transcriptase-mediated polymerase chain reaction assays, we found that in canine immature DCs (iDCs) the expression of DLA class II molecules, CD1a, CD11c, CD40, and CD86 was high and the expression of CD80, CD83, and CD14 either low or negative. During maturation (stimulated by LPS), the expression of CD1a, CD40, CD83, and CD80 was upregulated. However, the expression of DLA class II molecules, CD11c, and CD86 was not increased in mature DCs. Incubating the iDCs with LPS decreased antigen uptake and increased the cells’ immunostimulatory capacity (assessed by the allogeneic mixed-lymphocyte reaction), indicating that LPS accelerates the functional maturation of DCs. This protocol may facilitate the use of DCs in cellular immunotherapy. PMID:17695590

Wang, Yu-Shan; Chi, Kwan-Hwa; Liao, Kuang-Wen; Liu, Cheng-Chi; Cheng, Chiao-Lei; Lin, Yi-Chun; Cheng, Chiung-Hsiang; Chu, Rea-Min

2007-01-01

99

Infection and Activation of Monocytes by Marburg and Ebola Viruses  

Microsoft Academic Search

In this study we investigated the effects of Marburg virus and Ebola virus (species Zaire and Reston) infections on freshly isolated suspended monocytes in comparison to adherent macrophages under culture conditions. Our data showed that monocytes are permissive for both filoviruses. As is the case in macrophages, infection resulted in the activation of monocytes which was largely independent of virus

UTE STROHER; ELMAR WEST; HARALD BUGANY; HANS-DIETER KLENK; HANS-JOACHIM SCHNITTLER; HEINZ FELDMANN

2001-01-01

100

Study of zinc-induced changes in lymphocyte membranes using atomic force microscopy, luminescence, and light scattering methods  

NASA Astrophysics Data System (ADS)

Changes in the surface structure of lymphocyte membranes exposed to various concentrations of zinc ions are studied. It is found by atomic force microscopy that increasing the concentration of zinc ions leads to a reduction in the correlation length of the autocorrelation function of the roughness profile of a lymphocyte compared to control samples; this may indicate the existence of fine structure in the membrane surface. Fluorescence markers are used to observe a reduction in the microviscosity of the lipids in the outer monolayer of the lipid bilayer after lymphocytes are exposed to Zn ions, as well as the exposure of phosphatidylserine on the surface membrane, and the oxidation of HS-groups of membrane proteins. Calculations of the absorption coefficients of lymphocytes modified with zinc reveal the existence of absorption bands owing to the formation of metal-protein complexes and zinc oxide nanoparticles. These results indicate significant changes in the structural and functional state of lymphocyte membranes exposed to zinc ions.

Filimonenko, D. S.; Khairullina, A. Ya.; Yasinskii, V. M.; Kozlova, N. M.; Zubritskaja, G. P.; Slobozhanina, E. I.

2011-07-01

101

CC Chemokine Receptor (CCR)3\\/Eotaxin Is Followed by CCR4\\/Monocyte-derived Chemokine in Mediating Pulmonary T Helper Lymphocyte Type 2 Recruitment after Serial Antigen Challenge In Vivo  

Microsoft Academic Search

Isolated peripheral blood CD4 cells from allergic individuals express CC chemokine receptor (CCR)3 and CCR4 after expansion in vitro. In addition, human T helper type 2 (Th2) cells po- larized in vitro selectively express CCR3 and CCR4 at certain stages of activation\\/differentiation and respond preferentially to the ligands eotaxin and monocyte-derived chemokine (MDC). However, controversy arises when the in vivo

Clare M. Lloyd; Tracy Delaney; Trang Nguyen; Jane Tian; Carlos Martinez-A; Anthony J. Coyle; Jose-Carlos Gutierrez-Ramos

102

Fetal Growth Influences Lymphocyte Subset Counts at Birth: The Generation R Study  

Microsoft Academic Search

Background: Preterm born and low-birth-weight infants are at risk for severe infections in infancy. It has been suggested that these infants have an immature immune system. Objective:To assess the associations of gestational age, birth weight and fetal growth with absolute lymphocyte subset counts at birth. Methods: This study was conducted in 571 infants participating in the Generation R Study, a

Liesbeth Duijts; Liesbeth E. Bakker-Jonges; Joost A. M. Labout; Vincent W. V. Jaddoe; Albert Hofman; Eric A. P. Steegers; Jacques J. M. van Dongen; Herbert Hooijkaas; Henriëtte A. Moll

2009-01-01

103

Osteoclastic differentiation of mouse and human monocytes in a plasma clot/biphasic calcium phosphate microparticles composite.  

PubMed

We recently demonstrated that blood clotted around biphasic calcium phosphate (BCP) microparticles constituted a composite biomaterial that could be used for bone defect filling. In addition, we showed that mononuclear cells, i.e. monocytes and lymphocytes, play a central role in the osteogenic effect of this biomaterial. Hypothesizing that osteoclast progenitors could participate to the pro-osteogenic effect of mononuclear cells we observed previously, we focus on this population through the study of mouse monocyte/macrophage cells (RAW264.7 cell line), as well as human pre-osteoclastic cells derived from mononuclear hematopoietic progenitor cells (monocytes-enriched fraction from peripheral blood). Using monocyte-derived osteoclast progenitors cultured within plasma clot/BCP microparticles composite, we aimed in the present report at the elucidation of transcriptional profiles of genes related to osteoclastogenesis and to bone remodelling. For both human and mouse monocytes, real-time PCR experiments demonstrated that plasma clot/BCP scaffold potentiated the expression of marker genes of the osteoclast differentiation such as Nfactc1, Jdp2, Fra2, Tracp and Ctsk. By contrast, Mmp9 was induced in mouse but not in human cells, and Ctr expression was down regulated for both species. In addition, for both mouse and human precursors, osteoclastic differentiation was associated with a strong stimulation of VegfC and Sdf1 genes expression. At last, using field-emission scanning electron microscopy analysis, we observed the interactions between human monocytes and BCP microparticles. As a whole, we demonstrated that plasma clot/BCP microparticles composite provided monocytes with a suitable microenvironment allowing their osteoclastic differentiation, together with the production of pro-angiogenic and chemoattractant factors. PMID:21154244

Mouline, Caroline C; Quincey, Danielle; Laugier, Jean-Pierre; Carle, Georges F; Bouler, Jean-Michel; Rochet, Nathalie; Scimeca, Jean-Claude

2010-01-01

104

TLR4-Mediated Expression of Mac-1 in Monocytes Plays a Pivotal Role in Monocyte Adhesion to Vascular Endothelium  

PubMed Central

Toll-like receptor 4 (TLR4) is known to mediate monocyte adhesion to endothelial cells, however, its role on the expression of monocyte adhesion molecules is unclear. In the present study, we investigated the role of TLR4 on the expression of monocyte adhesion molecules, and determined the functional role of TLR4-induced adhesion molecules on monocyte adhesion to endothelial cells. When THP-1 monocytes were stimulated with Kdo2-Lipid A (KLA), a specific TLR4 agonist, Mac-1 expression was markedly increased in association with an increased adhesion of monocytes to endothelial cells. These were attenuated by anti-Mac-1 antibody, suggesting a functional role of TLR4-induced Mac-1 on monocyte adhesion to endothelial cells. In monocytes treated with MK886, a 5-lipoxygenase (LO) inhibitor, both Mac-1 expression and monocyte adhesion to endothelial cells induced by KLA were markedly attenuated. Moreover, KLA increased the expression of mRNA and protein of 5-LO, suggesting a pivotal role of 5-LO on these processes. In in vivo studies, KLA increased monocyte adhesion to aortic endothelium of wild-type (WT) mice, which was attenuated in WT mice treated with anti-Mac-1 antibody as well as in TLR4-deficient mice. Taken together, TLR4-mediated expression of Mac-1 in monocytes plays a pivotal role on monocyte adhesion to vascular endothelium, leading to increased foam cell formation in the development of atherosclerosis. PMID:25116953

Seo, Kyo Won; Bae, Jin Ung; Park, So Youn; Kim, Chi Dae

2014-01-01

105

Regulation of Monocyte Adhesion and Migration by Nox4  

PubMed Central

We showed that metabolic disorders promote thiol oxidative stress in monocytes, priming monocytes for accelerated chemokine-induced recruitment, and accumulation at sites of vascular injury and the progression of atherosclerosis. The aim of this study was to identify both the source of reactive oxygen species (ROS) responsible for thiol oxidation in primed and dysfunctional monocytes and the molecular mechanisms through which ROS accelerate the migration and recruitment of monocyte-derived macrophages. We found that Nox4, a recently identified NADPH oxidase in monocytes and macrophages, localized to focal adhesions and the actin cytoskeleton, and associated with phospho-FAK, paxillin, and actin, implicating Nox4 in the regulation of monocyte adhesion and migration. We also identified Nox4 as a new, metabolic stress-inducible source of ROS that controls actin S-glutathionylation and turnover in monocytes and macrophages, providing a novel mechanistic link between Nox4-derived H2O2 and monocyte adhesion and migration. Actin associated with Nox4 was S-glutathionylated, and Nox4 association with actin was enhanced in metabolically-stressed monocytes. Metabolic stress induced Nox4 and accelerated monocyte adhesion and chemotaxis in a Nox4-dependent mechanism. In conclusion, our data suggest that monocytic Nox4 is a central regulator of actin dynamics, and induction of Nox4 is the rate-limiting step in metabolic stress-induced monocyte priming and dysfunction associated with accelerated atherosclerosis and the progression of atherosclerotic plaques. PMID:23825596

Lee, Chi Fung; Ullevig, Sarah; Kim, Hong Seok; Asmis, Reto

2013-01-01

106

Deficiency of the adhesive protein complex lymphocyte function antigen 1, complement receptor type 3, glycoprotein p150,95 in a girl with recurrent bacterial infections. Effects on phagocytic cells and lymphocyte functions.  

PubMed Central

A patient presenting delayed umbilical cord detachment, severe recurrent bacterial infections, and inability to form pus exhibited a profound defect in the expression of alpha- and beta-chains of the receptor for the C3bi fragment of C3 (CR3), lymphocyte function antigen 1 (LFA-1) molecule, and the p150,95 molecule found on neutrophils, monocytes, and lymphocyte membranes. This was shown by immunofluorescence studies using specific monoclonal antibodies, rosette formation with C3bi-coated erythrocytes, and immunoprecipitation for the LFA-1 complex. These membrane defects were responsible for abnormal phagocytic cell functions including adherence to nylon wool, cell movement, phagocytosis, and opsonized particle-induced oxidative response and for defective natural killer cell activity. In addition, lymphocyte function deficiencies previously unobserved in this disease were found. Cytolytic T lymphocyte activity was profoundly reduced; alpha- and gamma-interferon production were impaired. Finally, there was no antibody production to vaccinal antigens whereas the antibody responses to polysaccharides and to cytomegalovirus were found to be normal. The cytotoxic T cell deficiency could be expected from previous blocking experiments of this function with monoclonal antibodies to LFA-1 and is probably related to an extremely severe deficiency in LFA-1 expression in this patient. Anomalies in interferon and in antibody production suggest additional role(s) of the LFA-1 complex in monocyte/T lymphocyte/B lymphocyte cell interactions that have not yet been envisaged. Images PMID:2934411

Fischer, A; Seger, R; Durandy, A; Grospierre, B; Virelizier, J L; Le Deist, F; Griscelli, C; Fischer, E; Kazatchkine, M; Bohler, M C

1985-01-01

107

Monocyte chemoattractant protein-3, but not monocyte chemoattractant protein-2, is a functional ligand of the human monocyte chemoattractant protein-1 receptor.  

PubMed

Monocyte chemoattractant protein (MCP)-2 and -3 are recently identified members of the Cys-Cys chemokine family and are highly homologous to MCP-1. MCP-1, MCP-2, and MCP-3 are potent chemoattractants for monocytes, basophils, and T lymphocytes. In this study, we have examined potential interactions of MCP-2 and MCP-3 with the recently cloned MCP-1 receptor. MCP-3, but not MCP-2, induced a robust and dose-dependent mobilization of intracellular calcium in HEK-293 cells that had been stably transfected with the MCP-1 receptor. The kinetics of these calcium transients were similar to those elicited by MCP-1. MCP-1 and MCP-3 induced potent inhibition of adenylyl cyclase (concentrations giving 50% inhibition = 48 pM and 67 pM, respectively). MCP-3 bound to HEK-293 cells stably expressing the MCP-1 receptor, but with approximately 35-fold lower affinity than MCP-1. MCP-1 desensitized transfected HEK-293 cells expressing the MCP-1 receptor to activation by MCP-3 in the calcium mobilization assay, but MCP-3 did not effectively desensitize these cells to MCP-1. We conclude that MCP-3, but not MCP-2, is a functional ligand for the MCP-1 receptor. PMID:7759884

Franci, C; Wong, L M; Van Damme, J; Proost, P; Charo, I F

1995-06-15

108

Monocyte Scintigraphy in Rheumatoid Arthritis: The Dynamics of Monocyte Migration in Immune-Mediated Inflammatory Disease  

PubMed Central

Background Macrophages are principal drivers of synovial inflammation in rheumatoid arthritis (RA), a prototype immune-mediated inflammatory disease. Conceivably, synovial macrophages are continuously replaced by circulating monocytes in RA. Animal studies from the 1960s suggested that macrophage replacement by monocytes is a slow process in chronic inflammatory lesions. Translation of these data into the human condition has been hampered by the lack of available techniques to analyze monocyte migration in man. Methods/Principal Findings We developed a technique that enabled us to analyze the migration of labelled autologous monocytes in RA patients using single photon emission computer tomography (SPECT). We isolated CD14+ monocytes by CliniMACS in 8 patients and labeled these with technetium-99m (99mTc-HMPAO). Monocytes were re-infused into the same patient. Using SPECT we calculated that a very small but specific fraction of 3.4×10?3 (0.95?5.1×10?3) % of re-infused monocytes migrated to the inflamed joints, being detectable within one hour after re-infusion. Conclusions/Significance The results indicate monocytes migrate continuously into the inflamed synovial tissue of RA patients, but at a slow macrophage-replacement rate. This suggests that the rapid decrease in synovial macrophages that occurs after antirheumatic treatment might rather be explained by an alteration in macrophage retention than in monocyte influx and that RA might be particularly sensitive to treatments targeting inflammatory cell retention. PMID:19924229

Thurlings, Rogier M.; Wijbrandts, Carla A.; Bennink, Roelof J.; Dohmen, Serge E.; Voermans, Carlijn; Wouters, Diana; Izmailova, Elena S.; Gerlag, Danielle M.; van Eck-Smit, Berthe L. F.; Tak, Paul P.

2009-01-01

109

Monocyte Chemotactic Protein 1 Is a Potent Activator of\\  

Microsoft Academic Search

Sumnlfl~ Cytokines belonging to the RANTES\\/SIS family are highly induced in a number of pathophysiological processes such as autoimmune disorders, cancers, atherosderosis, and chronic inflammation. However, apart from their chemotactic activity on monocytes and particular lymphocyte types, the biological activities in the human system of this recently discovered cytokine family are largely unknown. Here we report that one family member,

Stephan C. Bischoff; Martin Krieger; Thomas Brunner; Clemens A. Dahinden

110

Induction of immunomodulatory monocytes by human mesenchymal stem cell-derived hepatocyte growth factor through ERK1/2.  

PubMed

Monocytes are a population of leukocytes that terminally differentiate into macrophages and DCs. Whereas these differentiated progeny have inflammatory and resident--which are more immunomodulatory--phenotypes, less has been reported on the plasticity of monocytes themselves. We found that MSCs, a population of somatic stem cells, can rapidly induce human and murine monocytes through secretion of HGF to acquire an immunomodulatory phenotype to suppress T cell effector function. MSCs are multilineage postnatal progenitor cells with strong immunomodulatory effects toward T lymphocytes, NK lymphocytes, and DCs, but less is known regarding their interactions with monocytes. We found that CD14(+) human monocytes express c-Met, the receptor for HGF, and both depletion of HGF-treated CD14(+) monocytes and knockdown of HGF secretion in MSCs abrogate the suppression of anti-CD3/28-activated T cell proliferation. HGF-treated monocytes remain undifferentiated and can alter activated T cell cytokine expression from a Th1 toward Th2 profile. Moreover, monocytes cocultured with MSCs or treated with HGF alone can produce high levels of IL-10, a potent immunomodulatory cytokine. Injection of HGF to WT mice also results in an increase in IL-10(+)-expressing monocytes from the spleen, a known reservoir for circulating monocytes. Mechanistically, HGFs modulate IL-10 production in monocytes through the ERK1/2 pathway. Our data demonstrate further the pleomorphic nature of MSC immunomodulation, as well as highlight the important role of immunomodulatory monocytes in altering T cell effector function. PMID:24714552

Chen, Pei-Min; Liu, Ko-Jiunn; Hsu, Pei-Ju; Wei, Chung-Fan; Bai, Chyi-Huey; Ho, Ling-Jun; Sytwu, Huey-Kang; Yen, B Linju

2014-08-01

111

Honeybee apisimin and plant arabinogalactans in honey costimulate monocytes.  

PubMed

Here we determined whether immunostimulatory plant-derived arabinogalactan proteins (AGPs) and the honeybee-derived protein apisimin are present in varieties of New Zealand honey. Apisimin is a protein of unknown function secreted from the glands of honeybees into Royal Jelly, forming a complex with apalbumin1 capable of stimulating lymphocyte proliferation. AGPs were abundant in kanuka honey with lesser amounts in manuka, kowhai and clover honeys, but absent from Royal Jelly. Apisimin was present in all honeys, as well as Royal Jelly. We report that apisimin shares with honey AGPs the ability to stimulate the release of TNF-? from blood monocytes. Further, it synergizes with AGPs to enhance the release of TNF-?, via a mechanism not involving the formation of a complex with AGPs. In summary, this study provides evidence that AGPs and apisimin are commonly present in different floral varieties of honey, and hence contribute to their immunostimulatory properties. PMID:25172680

Gannabathula, Swapna; Krissansen, Geoffrey W; Skinner, Margot; Steinhorn, Gregor; Schlothauer, Ralf

2015-02-01

112

Isoprinosine stimulates granulocyte chemiluminescence and inhibits monocyte chemiluminescence in vitro.  

PubMed

Isoprinosine may delay disease progression in human immunodeficiency virus infection, presumably through modulation of lymphocyte function. However, the influence of isoprinosine on phagocyte function is largely unknown. This study describes the effects of isoprinosine and azidothymidine on phagocyte chemiluminescence and migration. Incubation with isoprinosine concentrations of 250 micrograms/ml and above increased the chemiluminescence of granulocytes. Random migration of granulocytes was decreased at isoprinosine concentrations of 50 micrograms/ml and higher, but chemotaxis was not affected. Azidothymidine exerted no effect on the chemiluminescence or migration of granulocytes. For monocytes, luminol-enhanced chemiluminescence was reduced at isoprinosine concentrations of 250 micrograms/ml and above, whereas migration was not affected. These findings suggest that the immunomodulatory properties of isoprinosine may extend to phagocytic cells. This may be of significance in the treatment of immunodeficiency states. PMID:7516672

Flø, R W; Naess, A; Albrektsen, G; Solberg, C O

1994-04-01

113

From proliferation to proliferation: monocyte lineage comes full circle  

PubMed Central

Monocytes are mononuclear circulating phagocytes that originate in the bone marrow and give rise to macrophages in peripheral tissue. For decades, our understanding of monocyte lineage was bound to a stepwise model that favored an inverse relationship between cellular proliferation and differentiation. Sophisticated molecular and surgical cell tracking tools have transformed our thinking about monocyte topo-ontogeny and function. Here, we discuss how recent studies focusing on progenitor proliferation and differentiation, monocyte mobilization and recruitment, and macrophage differentiation and proliferation are reshaping knowledge of monocyte lineage in steady state and disease. PMID:24435095

Swirski, Filip K.; Hilgendorf, Ingo; Robbins, Clinton S.

2014-01-01

114

LRP overexpression in monocytic lineage.  

PubMed

The failure to chemotherapy is a multi factorial phenomenon and lung resistance protein (LRP) overexpression has already been discussed as implicated in drug resistance. But its role is still discussed. In 1996, we studied the expression of LRP and P170 (MDR) in a series of leukemias, at the time of diagnosis, by immunocytochemical (ICC) method. The observation of a strong and unusual expression of LRP in acute myeloid leukemia (AML) with monocytic component led us to test (for P170 and LRP) a new series of 47 AML with different FAB subtypes. The expression of LRP was scored from 1 to 5 in blast cells and monocytes separately. We demonstrate that LRP is not correlated with clinical outcome but is statistically related to monoblastic leukemias. Code 5 reaction was found in 10/13 M5 versus the other FAB subtypes (P<10(-3)). The strongest LRP overexpression was also found in chronic myelomonocytic leukemia (four cases), reactive monocytosis (three cases) and in a dendritic cell line. In conclusion, we report that LRP is rather a marker of monocytic lineage than a prognostic index for MDR and we suggest that detection of LRP by ICC could be an argument for the diagnosis of monoblastic and monocytic leukemias. PMID:12801535

Sunnaram, Béatrice Ly; Gandemer, Virginie; Sebillot, Martine; Grandgirard, Nathalie; Amiot, Laurence; Leray, Emmanuelle; Goasguen, Jean E

2003-08-01

115

Radiation effects on cultured human monocytes and on monocyte-derived macrophages  

SciTech Connect

Prior to administration, leukocyte transfusions are commonly irradiated with up to 5,000 R to eliminate lymphocytes and thereby prevent graft-versus-host disease in the recipient. It has been widely believed that phagocytes are resistant to this irradiation. In a recent report, it was noted that phagocyte oxidative metabolism was compromised during preparation of white cells for transfusion. As part of the effort to examine the basis for this inhibition of phagocyte function during white cell preparation, an assessment was made of the effects of irradiation on the long-lived monocytes that have been shown to persist at inflammatory foci posttransfusion. Human monocytes were irradiated for up to 3 min, receiving 2,500-5,000 R. This irradiation damaged human monocytes, significantly decreasing their in vitro survival for the first 3 wk of culture, and growth as assessed by two-dimensional cell size measurements during the first 2 wk of culture. Despite smaller cell size, total cell protein was significantly increased over time in irradiated cultures. Extracellular release of lysozyme and beta-glucuronidase per cell was not affected by irradiation, but extracellular lactate dehydrogenase (LDH) release was significantly increased after irradiation. Irradiated monocytes killed Listeria monocytogenes at a slower rate than the nonirradiated controls. Thus, the data indicate that irradiation in doses used to prevent graft-versus-host disease in leukocyte transfusion recipients has a deleterious effect on in vitro human monocyte survival and function.

Buescher, E.S.; Gallin, J.I.

1984-06-01

116

Transient downregulation of monocyte-derived dendritic-cell differentiation, function, and survival during tumoral progression and regression in an in vivo canine model of transmissible venereal tumor.  

PubMed

Tumors often target dendritic cells (DCs) to evade host immune surveillance. DC injury is reported in many rodent and human tumors but seldom in tumors of other mammals. Canine transmissible venereal tumor (CTVT), a unique and spontaneous cancer transmitted by means of viable tumor cells. CTVT causes manifold damage to monocyte-derived DCs. This cancer provides an in vivo model of cancer to study the role of monocyte-derived DCs during spontaneous regression. Using flow cytometry and real-time reverse-transcription polymerase chain reactions, we compared the expression of surface molecules on monocyte-derived DCs between normal dogs and dogs with CTVT. These markers were CD1a, CD83, costimulatory factors (CD40, CD80, and CD86), and major histocompatability complex classes I and II. In immature DCs (iDCs) and lipopolysaccharide-treated mature DCs (mDCs), the surface markers were mostly downregulated during tumoral progression and regression. The tumor lowered endocytic activity of iDCs, as reflected in dextran uptake, and decreased allogeneic mixed lymphocyte reactions of mDCs. In addition, it decreased the number of monocytes in the peripheral blood by 40%. The tumor substantially impaired the efficiency with which DCs were generated from monocytes and with which mDCs were generated from iDCs. We also found that progression-phase CTVT supernatants that were cultured for 48 h and that contained protein components killed both monocytes and DCs. Additionally, DC numbers were significantly lower in the draining lymph nodes in CTVT dogs than in normal dogs. In conclusion, CTVT caused devastating damage to monocyte-derived DCs; this might be one of its mechanisms for evading host immunity. Reestablishment of monocyte-derived DC activity by the host potentially might contribute to spontaneous tumoral regression. These findings provide insight into the extent of tumoral effects on host immune systems and responses. This information is useful for developing cancer immunotherapies. PMID:17710396

Liu, Cheng-Chi; Wang, Yu-Shan; Lin, Ching-Yi; Chuang, Tien-Fu; Liao, Kuang-Wen; Chi, Kwan-Hwa; Chen, Mo-Fan; Chiang, Hsin-Chien; Chu, Rea-Min

2008-04-01

117

B lymphocyte alloantigens in the study of the genetic basis of rheumatoid arthritis.  

PubMed

In order to carry out tissue typing studies in patients with rheumatoid arthritis (RA), 116 sera from pregnant multiparous women were screened for cytotoxicity specific for B lymphocytes. It was possible to identify three sera (M55, M58, M87) which reacted specifically with B cells after absorption with platelets. Each appeared to have a different specificity which was presumed to correspond to an alloantigen marker on the lymphocyte surface. The frequency of these alloantigen markers on B lymphocytes was investigated in patients with classical or definite RA and in controls. One of these, M58, occurred in 32 out of 43 RA patients (74 - 4%) compared with 10 out of 37 controls (27%). This difference was highly significant (P less than 0 - 0005). The relative risk of developing RA is 7 - 85 times greater in those possessing alloantigen M58. The other two B cell alloantigens failed to show any association with RA. The association with M58 may indicate a significant genetic contribution to disease susceptibility in RA. PMID:71024

Panayi, G S; Wooley, P H

1977-08-01

118

Combined Cytogenotoxic Effects of Bee Venom and Bleomycin on Rat Lymphocytes: An In Vitro Study  

PubMed Central

This study was carried out to determine the cytotoxic and genotoxic effects of bee venom (BV) and/or the chemotherapeutic agent bleomycin (BLM) on healthy isolated rat lymphocytes utilizing morphometric and molecular techniques. Using the Ficoll-Histopaque density gradient centrifugation technique, lymphocytes were isolated, divided into groups, and subjected to BV and/or BLM at incubation medium concentrations of 10 or 20??g/mL respectively for 24 and 72?hrs. An MTT assay and fluorescent microscopy examinations were used to assess the cytotoxic effects. To determine the predominant type of BV and/or BLM-induced cell death, LDH release assay was employed beside quantitative expression analyses of the apoptosis-related genes (Caspase-3 and Bcl-2). The genotoxic effects of the tested compounds were evaluated via DNA fragmentation assay. The results of these assays demonstrated that BV potentiates BLM-induced cytotoxicity through increased LDH release and diminished cell viability. Nevertheless, BV significantly inhibited the BLM-induced DNA damage. The results verify that BV significantly attenuates the genotoxic effects of BLM on noncancerous isolated rat lymphocytes but does not diminish BLM cytotoxicity. PMID:24822179

Abd-Elhakim, Yasmina M.; Khalil, Samah R.; Awad, Ashraf; AL-Ayadhi, Laila Y.

2014-01-01

119

Combined cytogenotoxic effects of bee venom and bleomycin on rat lymphocytes: an in vitro study.  

PubMed

This study was carried out to determine the cytotoxic and genotoxic effects of bee venom (BV) and/or the chemotherapeutic agent bleomycin (BLM) on healthy isolated rat lymphocytes utilizing morphometric and molecular techniques. Using the Ficoll-Histopaque density gradient centrifugation technique, lymphocytes were isolated, divided into groups, and subjected to BV and/or BLM at incubation medium concentrations of 10 or 20 ?g/mL respectively for 24 and 72 hrs. An MTT assay and fluorescent microscopy examinations were used to assess the cytotoxic effects. To determine the predominant type of BV and/or BLM-induced cell death, LDH release assay was employed beside quantitative expression analyses of the apoptosis-related genes (Caspase-3 and Bcl-2). The genotoxic effects of the tested compounds were evaluated via DNA fragmentation assay. The results of these assays demonstrated that BV potentiates BLM-induced cytotoxicity through increased LDH release and diminished cell viability. Nevertheless, BV significantly inhibited the BLM-induced DNA damage. The results verify that BV significantly attenuates the genotoxic effects of BLM on noncancerous isolated rat lymphocytes but does not diminish BLM cytotoxicity. PMID:24822179

Abd-Elhakim, Yasmina M; Khalil, Samah R; Awad, Ashraf; Al-Ayadhi, Laila Y

2014-01-01

120

Pulsed nuclear magnetic resonance study of 17O from H217O in rat lymphocytes.  

PubMed Central

Lymphocytes obtained from thymus glands of normal rats and culture lines of malignant rat thymocytes were enriched with H217O. The longitudinal and transverse relaxations of the 17O were determined separately in samples of packed cells and supernatant solutions. The longitudinal relaxation of intracellular 17O of fresh viable lymphocytes was nonexponential, becoming simply exponential with eventual necrosis. The rate of spin-lattice relaxation (1/T1) was fitted by a sum of two exponentials. The average mole fraction of the molecules subject to the slower relaxation rate (1/T1s) was two-thirds of the total water. Lowering the Larmor frequency (omega) from 7.72 to 4.36 MHZ increased the faster component (1/T1f) by 12% without altering (1/T1s). The value of the single exponential decay of the nonviable cells was not appreciably different from the initial rate of relaxation of the fresh cells. Similar results were obtained in studies of the transverse relaxation rates. The simplest interpretation is that two-thirds of the cell water is located within the nucelus and is characterized by a slower rate of relaxation than the one-third of the cell water in the cytoplasm because of the different macromolecular compositions of the two-subcellular compartments. The malignant lymphocytes were characterized by prolonged values for the slow and fast components of both the longitudinal and transverse relaxations of 17O. PMID:1084165

Shporer, M; Haas, M; Civan, M M

1976-01-01

121

Anti-CD20 B-cell depletion enhances monocyte reactivity in neuroimmunological disorders  

PubMed Central

Background Clinical trials evaluating anti-CD20-mediated B-cell depletion in multiple sclerosis (MS) and neuromyelitis optica (NMO) generated encouraging results. Our recent studies in the MS model experimental autoimmune encephalomyelitis (EAE) attributed clinical benefit to extinction of activated B-cells, but cautioned that depletion of naïve B-cells may be undesirable. We elucidated the regulatory role of un-activated B-cells in EAE and investigated whether anti-CD20 may collaterally diminish regulatory B-cell properties in treatment of neuroimmunological disorders. Methods Myelin oligodendrocyte glycoprotein (MOG) peptide-immunized C57Bl/6 mice were depleted of B-cells. Functional consequences for regulatory T-cells (Treg) and cytokine production of CD11b+ antigen presenting cells (APC) were assessed. Peripheral blood mononuclear cells from 22 patients receiving anti-CD20 and 23 untreated neuroimmunological patients were evaluated for frequencies of B-cells, T-cells and monocytes; monocytic reactivity was determined by TNF-production and expression of signalling lymphocytic activation molecule (SLAM). Results We observed that EAE-exacerbation upon depletion of un-activated B-cells closely correlated with an enhanced production of pro-inflammatory TNF by CD11b+ APC. Paralleling this pre-clinical finding, anti-CD20 treatment of human neuroimmunological disorders increased the relative frequency of monocytes and accentuated pro-inflammatory monocyte function; when reactivated ex vivo, a higher frequency of monocytes from B-cell depleted patients produced TNF and expressed the activation marker SLAM. Conclusions These data suggest that in neuroimmunological disorders, pro-inflammatory APC activity is controlled by a subset of B-cells which is eliminated concomitantly upon anti-CD20 treatment. While this observation does not conflict with the general concept of B-cell depletion in human autoimmunity, it implies that its safety and effectiveness may further advance by selectively targeting pathogenic B-cell function. PMID:22027448

2011-01-01

122

Monocyte fate in atherosclerosis.  

PubMed

Monocytes and their descendant macrophages are essential to the development and exacerbation of atherosclerosis, a lipid-driven inflammatory disease. Lipid-laden macrophages, known as foam cells, reside in early lesions and advanced atheromata. Our understanding of how monocytes accumulate in the growing lesion, differentiate, ingest lipids, and contribute to disease has advanced substantially over the last several years. These cells' remarkable phenotypic and functional complexity is a therapeutic opportunity: in the future, treatment and prevention of cardiovascular disease and its complications may involve specific targeting of atherogenic monocytes/macrophages and their products. PMID:25538208

Hilgendorf, Ingo; Swirski, Filip K; Robbins, Clinton S

2015-02-01

123

Comparative study on lymphocyte subpopulations in cancer patients after immunostimulation with propionibacteria and in renal transplant patients after combined immunosuppression.  

PubMed

In two groups of patients the influence of unspecific immunostimulation (group 1) and combined immunosuppression (group 2) on lymphocyte subpopulations was studied. Patients constituting group 1 suffered from gastric and colorectal carcinoma, respectively, and were preoperatively treated with 10 mg whole cell preparation of immunostimulating Propionibacterium avidum KP-40 (Köln-Propioni, strain 40). Patients of group 2 were submitted to combined immunosuppressive therapy and treated with antilymphocyte globulin, prednisone, and azathioprine subsequent to renal transplantation. Immunostimulation with P. avidum KP-40 resulted in a significant increase (p less than or equal to 0.01) of the natural killer (NK) cell population, whereas total leukocyte and lymphocyte counts as well as helper and suppressor T lymphocyte subsets did not evidently differ from control values. On the contrary after immunosuppression all subsets of lymphocytes as well as NK cells significantly decreased. PMID:2149816

Peters, K M; Pfeiffer, R; Bornhofen, B; Ko, H L; Beuth, J; Grundmann, R; Pulverer, G

1990-10-01

124

Lymphocytic gastritis: a newly described entity: a retrospective endoscopic and histological study  

Microsoft Academic Search

Lymphocytic gastritis is a histopathological entity characterised by the accumulation of small lymphocytes in the surface and foveolar epithelium. In order to investigate the correlation between endoscopy and histology in this condition, 192 observations selected on the basis of a presumed diagnosis of erosive or varioliform gastritis were reviewed. Ninety two instances corresponded to lymphocytic gastritis, while 100 did not

J Haot; L Hamichi; L Wallez; P Mainguet

1988-01-01

125

Characterization of the B lymphocyte-induced maturation protein-1 (Blimp1) gene, mRNA isoforms and basal promoter  

Microsoft Academic Search

Blimp-1 is a transcriptional repressor that is both required and sufficient to trigger terminal differentiation of B lymphocytes and monocyte\\/macrophages. Here we report the organization of the mouse Blimp-1 gene, an analysis of Blimp-1 homologs in different species, the characterization of Blimp-1 mRNA isoforms and initial studies on the transcription of Blimp-1. The murine Blimp-1 gene covers ~23 kb and

Chainarong Tunyaplin; Miriam A. Shapiro; Kathryn L. Calame

2000-01-01

126

Subpopulations of human peripheral granulocyes and monocytes express receptors for IgA.  

PubMed Central

Receptors for the Fc portion of immunoglobin on human peripheral blood cells were enumerated by rosette formation with ox erythrocytes sensitized with rabbit IgG, IgA, and IgM. A large percentage of purified polymorphonuclear leukocytes and monocytes were found to express receptors for IgA. These receptors were also found to exist on a significantly greater percentage of lymphocytes than was previously observed. The receptors for IgA were specific, as verified by blocking studies using purified human immunogloblins. In addition, some polymorphonuclear leukocytes and monocytes were observed concomitantly to posses independent receptors for both IgG and IgA. These studies may indicate that IgA can cooperate with monocytes or polymorphonuclear leukocytes through receptors for IgA on these cells and perhaps mediate immune defense on mucosal surfaces. Initial studies on antibody-dependent cellular cytotoxicity suggested that IgA alone is ineffectual in supporting cytolysis by nonactivated human peripheral blood cells. PMID:6932039

Fanger, M W; Shen, L; Pugh, J; Bernier, G M

1980-01-01

127

Herpes simplex virus antigens directly activate NK cells via TLR2, thus facilitating their presentation to CD4 T lymphocytes.  

PubMed

NK cells infiltrate human herpetic lesions, but their role has been underexplored. HSV can stimulate innate immune responses via surface TLR2, which is expressed on monocyte-derived dendritic cells (DCs) and NK cells. In this study, UV-inactivated HSV1/2 and immunodominant HSV2 glycoprotein D peptides conjugated to the TLR2 agonist dipalmitoyl-S-glyceryl cysteine stimulated CD4 T lymphocyte IFN-? responses within PBMCs or in coculture with monocyte-derived DCs. NK cells contributed markedly to the PBMC responses. Furthermore, NK cells alone were activated directly by both Ags, also upregulating HLA-DR and HLA-DQ and then they activated autologous CD4 T lymphocytes. Using Transwells, Ag-stimulated NK cells and CD4 T lymphocytes were shown to interact through both cell-to-cell contact and cytokines, differing in relative importance in different donors. A distinct immunological synapse between Ag-stimulated NK cells and CD4 T lymphocytes was observed, indicating the significance of their cell-to-cell contact. A large proportion (57%) of NK cells was also in contact with CD4 T lymphocytes in the dermal infiltrate of human recurrent herpetic lesions. Thus, NK cells stimulated by TLR2-activating HSV Ags can present Ag alone or augment the role of DCs in vitro and perhaps in herpetic lesions or draining lymph nodes. In addition to DCs, NK cells should be considered as targets for adjuvants during HSV vaccine development. PMID:22467654

Kim, Min; Osborne, Naomi R; Zeng, Weiguang; Donaghy, Heather; McKinnon, Kay; Jackson, David C; Cunningham, Anthony L

2012-05-01

128

Setae from Larvae of the Northern Processionary Moth (Thaumetopoea pinivora, TP) Stimulate Proliferation of Human Blood Lymphocytes In Vitro  

PubMed Central

Larvae of the Northern pine processionary moth (Thaumetopoea pinivora, TP) carry microscopic needles (setae), which by penetrating skin and mucous membranes, may cause inflammatory/immune derived symptoms in man. In the present study the stimulatory effects of setae on human blood lymphocytes in vitro was investigated. Blood mononuclear cells were separated from venous blood or buffy coat of ten healthy individuals, six previously exposed to setae and four with no known exposure. Lymphoproliferation was measured as uptake of 3H-thymidine. Setae were prepared from TP larvae. Setae and saline setae extracts stimulated proliferation of T-lymphocytes in the presence of monocytic cells. Stimulation was pronounced in cells from persons who had been exposed to setae, and weak in cells from non-exposed donors. Chitin also induced lymphocyte proliferation in most donors, but to a lesser extent and independently of donor's previous exposure to setae. In conclusion, setae contain molecules that in the presence of monocytes activate human T-lymphocytes to proliferation. The antigenic nature of stimulatory molecules was supported by the significantly stronger lymphocyte response in persons previously exposed to setae than in non-exposed donors. The nature of such molecules remains to be defined. PMID:25531291

Holm, Göran; Andersson, Margareta; Ekberg, Monica; Fagrell, Bengt; Sjöberg, Jan; Bottai, Matteo; Björkholm, Magnus

2014-01-01

129

Immunological characterization of a ?? T-cell stimulatory ligand on autologous monocytes  

PubMed Central

Bovine ?? T cells are stimulated to proliferate by autologous monocytes. This is referred to as the autologous mixed leucocyte reaction (AMLR). It has been shown previously that the stimulatory component is constitutively expressed on the monocyte plasma membrane and is a protein or has a protein moiety. Here we showed that ?? T-cell responses to the monocytes requires interaction with the T-cell receptor because Fab1 fragments of a monoclonal antibody (mAb) that reacts with the ? chain of the T-cell receptor blocked proliferation in the AMLR. Monocyte molecules involved in stimulation were also characterized further by biochemical and immunological methods. A mAb, named M5, was generated by immunizing mice with bovine monocytes and shown to block the ability of monocytes to stimulate in the AMLR. Treatment of monocytes or monocyte membranes with high salt, chelating agents or phospholipase C did not affect their ability to stimulate ?? T-cell proliferation or reactivity with mAb M5 indicating the ability of monocytes to stimulate does not involve peripheral membrane components or a glycosyl-phosphatidylinsositol (GPI)-anchored components. Hence it was concluded that the stimulation occurred as a result of intergral membrane proteins including that recognized by mAb M5. The ligand for mAb M5 was on all bovine monocytes and to a lower level on granulocytes but not on lymphocytes. MAb M5 also reacted with sheep monocytes but not with human monocytes or murine macrophages, in agreement with a previous reports that sheep monocytes but not human or mouse mononuclear phagocytes have the capacity to stimulate bovine ?? T cells in in vitro cultures. The level of expression of the M5 ligand was not altered by ?-irradiation or culture of monocytes with lipopolysaccharide but it was decreased following culture with interferon-?-containing cell culture supernatants. PMID:11872093

Sathiyaseelan, Thillainayagam; Naiman, Brian; Welte, Stefan; Machugh, Niall; Black, Samuel J; Baldwin, Cynthia L

2002-01-01

130

Effects of environmental toxins on lymphocyte function: studies in rhesus and man  

SciTech Connect

The immune system is a potential target of environmental toxins. Impairment of immune function could have a disastrous effect upon the affected individual. We had the unique opportunity to study the results of a prolonged exposure to TCDD (2,3,7,8-tetrachlorodibenzo-P-dioxin) in rhesus monkeys and their offspring. Subsequently, we performed similar studies on humans exposed to the nematode pesticide, Aldicarb. This report summarizes those previous studies. In the monkeys, no major deficits of the immune system were found and the animals did not have excessive numbers of infections. However, at higher doses of dietary TCDD (25 ppt), only 22% of the offspring survived to 1 year of age. Thus, the failure to demonstrate effects on the young may simply relate to the essential equivalence of the lethal to an immunosuppressive dose. In humans, exposure to the acetylcholinesterase inhibitor, Aldicarb, was received through contaminated well water. The known exposure was for at least 1 year and could have been as long as 5 years. Various tests of the immune system, including lymphocyte subset counts, proliferative responses, total immunoglobulin levels and specific antibody responses did not reveal immunodeficiency. Increases in the numbers of CD8 positive T lymphocytes was observed. There was no evidence of any increase in clinical illness in the exposed compared with the control group.

Hong, R. (University of Wisconsin, Department of Pediatrics, Madison (USA))

1991-06-01

131

Lack of autologous mixed lymphocyte reaction in patients with chronic lymphocytic leukemia: evidence for autoreactive T-cell dysfunction not correlated with phenotype, karyotype, or clinical status  

SciTech Connect

In the present study, there was a complete lack of autologous MLR between responding T cells or T subsets and unirradiated or irradiated leukemic B cells or monocytes in all 20 patients with CLL, regardless of disease status, stage, phenotype, or karyotype of the disease. The stimulating capacity of unirradiated CLL B cells and CLL monocytes or irradiated CLL B cells was significantly depressed as compared to that of respective normal B cells and monocytes in allogeneic MLR. The responding capacity of CLL T cells was also variably lower than that of normal T cells against unirradiated or irradiated normal allogeneic B cells and monocytes. The depressed allogeneic MLR between CLL B cells or CLL monocytes and normal T cells described in the present study could be explained on the basis of a defect in the stimulating antigens of leukemic B cells or monocytes. The decreased allogeneic MLR of CLL T cells might simply be explained by a defect in the responsiveness of T lymphocytes from patients with CLL. However, these speculations do not adequately explain the complete lack of autologous MLR in these patients. When irradiated CLL B cells or irradiated CLL T cells were cocultured with normal T cells and irradiated normal B cells, it was found that there was no suppressor cell activity of CLL B cells or CLL T cells on normal autologous MLR. Our data suggest that the absence or dysfunction of autoreactive T cells within the Tnon-gamma subset account for the lack of autologous MLR in patients with CLL. The possible significance of the autologous MLR, its relationship to in vivo immunoregulatory mechanisms, and the possible role of breakdown of autoimmunoregulation in the oncogenic process of certain lymphoproliferative and autoimmune diseases in man are discussed.

Han, T.; Bloom, M.L.; Dadey, B.; Bennett, G.; Minowada, J.; Sandberg, A.A.; Ozer, H.

1982-11-01

132

Ofatumumab in poor-prognosis chronic lymphocytic leukemia: a Phase IV, non-interventional, observational study from the European Research Initiative on Chronic Lymphocytic Leukemia  

PubMed Central

We report the largest retrospective, phase IV non-interventional, observational study of ofatumumab therapy in heavily pre-treated patients with poor-prognosis chronic lymphocytic leukemia. Total number of patients was 103; median age was 65 years (range 39–85). Median number of prior lines of therapy was 4 (range 1–13), including, in most cases, rituximab-, fludarabine- and alemtuzumab-based regimens; 13 patients had been allografted. Of 113 adverse events, 28 (29%) were considered to be directly related to ofatumumab. Grade 3–4 toxicities included neutropenia (10%), thrombocytopenia (5%), anemia (3%), pneumonia (17%), and fever (3%). Two heavily pre-treated patients developed progressive multifocal leukoencephalopathy. On an intention-to-treat analysis, the overall response rate was 22% (3 complete response, 1 incomplete complete response). Median progression-free and overall survival times were 5 and 11 months, respectively. This study confirms in a daily-life setting the feasibility and acceptable toxicity of ofatumumab treatment in advanced chronic lymphocytic leukemia. The complete response rate, however, was low. Therefore, treatment with ofatumumab should be moved to earlier phases of the disease. Ideally, this should be done in combination with other agents, as recently approved for ofatumumab plus chlorambucil as front-line treatment for patients unfit for fludarabine. This study is registered at clinicaltrials.gov identifier:01453062. PMID:25596264

Moreno, Carol; Montillo, Marco; Panayiotidis, Panayiotis; Dimou, Maria; Bloor, Adrian; Dupuis, Jehan; Schuh, Anna; Norin, Stefan; Geisler, Christian; Hillmen, Peter; Doubek, Michael; Trn?ný, Marek; Obrtlikova, Petra; Laurenti, Luca; Stilgenbauer, Stephan; Smolej, Lukas; Ghia, Paolo; Cymbalista, Florence; Jaeger, Ulrich; Stamatopoulos, Kostas; Stavroyianni, Niki; Carrington, Patrick; Zouabi, Hamadi; Leblond, Veronique; Gomez-Garcia, Juan C.; Rubio, Martin; Marasca, Roberto; Musuraca, Gerardo; Rigacci, Luigi; Farina, Lucia; Paolini, Rossella; Pospisilova, Sarka; Kimby, Eva; Bradley, Colm; Montserrat, Emili

2015-01-01

133

Ofatumumab in poor-prognosis chronic lymphocytic leukemia: a Phase IV, non-interventional, observational study from the European Research Initiative on Chronic Lymphocytic Leukemia.  

PubMed

We report the largest retrospective, phase IV non-interventional, observational study of ofatumumab therapy in heavily pre-treated patients with poor-prognosis chronic lymphocytic leukemia. Total number of patients was 103; median age was 65 years (range 39-85). Median number of prior lines of therapy was 4 (range 1-13), including, in most cases, rituximab-, fludarabine- and alemtuzumab-based regimens; 13 patients had been allografted. Of 113 adverse events, 28 (29%) were considered to be directly related to ofatumumab. Grade 3-4 toxicities included neutropenia (10%), thrombocytopenia (5%), anemia (3%), pneumonia (17%), and fever (3%). Two heavily pre-treated patients developed progressive multifocal leukoencephalopathy. On an intention-to-treat analysis, the overall response rate was 22% (3 complete response, 1 incomplete complete response). Median progression-free and overall survival times were 5 and 11 months, respectively. This study confirms in a daily-life setting the feasibility and acceptable toxicity of ofatumumab treatment in advanced chronic lymphocytic leukemia. The complete response rate, however, was low. Therefore, treatment with ofatumumab should be moved to earlier phases of the disease. Ideally, this should be done in combination with other agents, as recently approved for ofatumumab plus chlorambucil as front-line treatment for patients unfit for fludarabine. This study is registered at clinicaltrials.gov identifier:01453062. PMID:25596264

Moreno, Carol; Montillo, Marco; Panayiotidis, Panayiotis; Dimou, Maria; Bloor, Adrian; Dupuis, Jehan; Schuh, Anna; Norin, Stefan; Geisler, Christian; Hillmen, Peter; Doubek, Michael; Trn?ný, Marek; Obrtlikova, Petra; Laurenti, Luca; Stilgenbauer, Stephan; Smolej, Lukas; Ghia, Paolo; Cymbalista, Florence; Jaeger, Ulrich; Stamatopoulos, Kostas; Stavroyianni, Niki; Carrington, Patrick; Zouabi, Hamadi; Leblond, Veronique; Gomez-Garcia, Juan C; Rubio, Martin; Marasca, Roberto; Musuraca, Gerardo; Rigacci, Luigi; Farina, Lucia; Paolini, Rossella; Pospisilova, Sarka; Kimby, Eva; Bradley, Colm; Montserrat, Emili

2015-04-01

134

Squamous Carcinoma Cells Influence Monocyte Phenotype and Suppress Lipopolysaccharide-Induced TNF-alpha in Monocytes  

PubMed Central

Bacteria and chronic inflammation are present in squamous cell carcinoma of the head and neck (HNSCC), but their roles in the pathogenesis of HNSCC are unclear. Our studies described here revealed that human monocytes co-cultured short term with HNSCC cells were more likely to express CD16, and CD16+ small mononuclear cells were common in HNSCC specimens. In addition, we identified monocytes as the primary source of LPS-induced IL-6 and TNF-alpha in the monocyte-HNSCC co-cultures. Remarkably, relative to LPS-stimulated monocytes cultured alone, HNSCC cells profoundly suppressed LPS-induced TNF-alpha in monocytes, without compromising IL-6 production. High levels of cytoprotective factors like IL-6 and low levels of TNF-alpha are important for the tumor microenvironment that enables tumor cell survival, affects monocyte differentiation and may contribute to tumor colonization by bacteria. This study provides novel observations that HNSCC cells affect monocyte phenotype and function, which are relevant to the regulation of the HNSCC microenvironment. PMID:20084448

Lam-ubol, Aroonwan; Hopkin, Dustin; Letuchy, Elena M.; Kurago, Zoya B.

2010-01-01

135

Monocytes Control Second-Phase Neutrophil Emigration in Established Lipopolysaccharide-induced Murine Lung Injury  

PubMed Central

Rationale: Acute lung injury (ALI) is an important cause of morbidity and mortality, with no currently effective pharmacological therapies. Neutrophils have been specifically implicated in the pathogenesis of ALI, and there has been significant research into the mechanisms of early neutrophil recruitment, but those controlling the later phases of neutrophil emigration that characterize disease are poorly understood. Objectives: To determine the influence of peripheral blood monocytes (PBMs) in established ALI. Methods: In a murine model of LPS-induced ALI, three separate models of conditional monocyte ablation were used: systemic liposomal clodronate (sLC), inducible depletion using CD11b diphtheria toxin receptor (CD11b DTR) transgenic mice, and antibody-dependent ablation of CCR2hi monocytes. Measurements and Main Results: PBMs play a critical role in regulating neutrophil emigration in established murine LPS-induced lung injury. Gr1hi and Gr1lo PBM subpopulations contribute to this process. PBM depletion is associated with a significant reduction in measures of lung injury. The specificity of PBM depletion was demonstrated by replenishment studies in which the effects were reversed by systemic PBM infusion but not by systemic or local pulmonary infusion of mature macrophages or lymphocytes. Conclusions: These results suggest that PBMs, or the mechanisms by which they influence pulmonary neutrophil emigration, could represent therapeutic targets in established ALI. PMID:22822022

Scholefield, Emma; Ferenbach, David; Gibbons, Michael; Duffin, Rodger; Dorward, David A.; Morris, Andrew Conway; Humphries, Duncan; MacKinnon, Alison; Wilkinson, Tom S.; Wallace, William A. H.; van Rooijen, Nico; Mack, Matthias; Rossi, Adriano G.; Davidson, Donald J.; Hirani, Nik; Hughes, Jeremy; Haslett, Chris; Simpson, A. John

2012-01-01

136

Regulation of icam-1 in cells of the monocyte/macrophage system in microgravity.  

PubMed

Cells of the immune system are highly sensitive to altered gravity, and the monocyte as well as the macrophage function is proven to be impaired under microgravity conditions. In our study, we investigated the surface expression of ICAM-1 protein and expression of ICAM-1 mRNA in cells of the monocyte/macrophage system in microgravity during clinostat, parabolic flight, sounding rocket, and orbital experiments. In murine BV-2 microglial cells, we detected a downregulation of ICAM-1 expression in clinorotation experiments and a rapid and reversible downregulation in the microgravity phase of parabolic flight experiments. In contrast, ICAM-1 expression increased in macrophage-like differentiated human U937 cells during the microgravity phase of parabolic flights and in long-term microgravity provided by a 2D clinostat or during the orbital SIMBOX/Shenzhou-8 mission. In nondifferentiated U937 cells, no effect of microgravity on ICAM-1 expression could be observed during parabolic flight experiments. We conclude that disturbed immune function in microgravity could be a consequence of ICAM-1 modulation in the monocyte/macrophage system, which in turn could have a strong impact on the interaction with T lymphocytes and cell migration. Thus, ICAM-1 can be considered as a rapid-reacting and sustained gravity-regulated molecule in mammalian cells. PMID:25654110

Paulsen, Katrin; Tauber, Svantje; Dumrese, Claudia; Bradacs, Gesine; Simmet, Dana M; Gölz, Nadine; Hauschild, Swantje; Raig, Christiane; Engeli, Stephanie; Gutewort, Annett; Hürlimann, Eva; Biskup, Josefine; Unverdorben, Felix; Rieder, Gabriela; Hofmänner, Daniel; Mutschler, Lisa; Krammer, Sonja; Buttron, Isabell; Philpot, Claudia; Huge, Andreas; Lier, Hartwin; Barz, Ines; Engelmann, Frank; Layer, Liliana E; Thiel, Cora S; Ullrich, Oliver

2015-01-01

137

Regulation of ICAM-1 in Cells of the Monocyte/Macrophage System in Microgravity  

PubMed Central

Cells of the immune system are highly sensitive to altered gravity, and the monocyte as well as the macrophage function is proven to be impaired under microgravity conditions. In our study, we investigated the surface expression of ICAM-1 protein and expression of ICAM-1 mRNA in cells of the monocyte/macrophage system in microgravity during clinostat, parabolic flight, sounding rocket, and orbital experiments. In murine BV-2 microglial cells, we detected a downregulation of ICAM-1 expression in clinorotation experiments and a rapid and reversible downregulation in the microgravity phase of parabolic flight experiments. In contrast, ICAM-1 expression increased in macrophage-like differentiated human U937 cells during the microgravity phase of parabolic flights and in long-term microgravity provided by a 2D clinostat or during the orbital SIMBOX/Shenzhou-8 mission. In nondifferentiated U937 cells, no effect of microgravity on ICAM-1 expression could be observed during parabolic flight experiments. We conclude that disturbed immune function in microgravity could be a consequence of ICAM-1 modulation in the monocyte/macrophage system, which in turn could have a strong impact on the interaction with T lymphocytes and cell migration. Thus, ICAM-1 can be considered as a rapid-reacting and sustained gravity-regulated molecule in mammalian cells. PMID:25654110

Paulsen, Katrin; Tauber, Svantje; Dumrese, Claudia; Bradacs, Gesine; Simmet, Dana M.; Gölz, Nadine; Hauschild, Swantje; Raig, Christiane; Engeli, Stephanie; Gutewort, Annett; Hürlimann, Eva; Biskup, Josefine; Rieder, Gabriela; Hofmänner, Daniel; Mutschler, Lisa; Krammer, Sonja; Philpot, Claudia; Huge, Andreas; Lier, Hartwin; Barz, Ines; Engelmann, Frank; Layer, Liliana E.; Thiel, Cora S.

2015-01-01

138

Prognostic significance of peripheral monocyte count in patients with extranodal natural killer/T-cell lymphoma  

PubMed Central

Background Extranodal natural killer/T-cell lymphoma (ENKL) has heterogeneous clinical manifestations and prognosis. This study aims to evaluate the prognostic impact of absolute monocyte count (AMC) in ENKL, and provide some immunologically relevant information for better risk stratification in patients with ENKL. Methods Retrospective data from 163 patients newly diagnosed with ENKL were analyzed. The absolute monocyte count (AMC) at diagnosis was analyzed as continuous and dichotomized variables. Independent prognostic factors of survival were determined by Cox regression analysis. Results The AMC at diagnosis were related to overall survival (OS) and progression-free survival (PFS) in patients with ENKL. Multivariate analysis identified AMC as independent prognostic factors of survival, independent of International Prognostic Index (IPI) and Korean prognostic index (KPI). The prognostic index incorporating AMC and absolute lymphocyte count (ALC), another surrogate factor of immune status, could be used to stratify all 163 patients with ENKL into different prognostic groups. For patients who received chemotherapy followed by radiotherapy (102 cases), the three AMC/ALC index categories identified patients with significantly different survivals. When superimposed on IPI or KPI categories, the AMC/ALC index was better able to identify high-risk patients in the low-risk IPI or KPI category. Conclusion The baseline peripheral monocyte count is shown to be an effective prognostic indicator of survival in ENKL patients. The prognostic index related to tumor microenvironment might be helpful to identify high-risk patients with ENKL. PMID:23638998

2013-01-01

139

Novel function of C4a anaphylatoxin. Release from monocytes of protein which inhibits monocyte chemotaxis.  

PubMed Central

The complement C4-derived anaphylatoxin, C4a, possesses a strong chemotaxis inhibitory capacity to blood monocytes at concentrations as low as 10(-16) mol/L. In our study, treatment with carboxypeptidase B to convert it to C4a des Arg77 decreased the inhibitory activity to less than 1/1,000. The extraordinary inhibitory capacity of C4a suggests the presence of an amplification mechanism in this inhibition. Indeed, we found that the conditioned media of peripheral blood mononuclear cells or monocyte/macrophage lineage cell lines (U937 and THP-1 cells) preincubated with 10(-16) mol/L C4a for 5 minutes or more at 37 C possessed the inhibitory capacity 100,000-fold stronger than the original activity of C4a. The monocyte-derived chemotaxis inhibitory factor seemed monocyte-specific. This cell-derived factor was sensitive to treatment with trypsin and chymotrypsin and immunologically distinct from C4a. The apparent molecular size of the monocyte factor was estimated to be approximately 20 kd by gel filtration. These results indicate that C4a anaphylatoxin induces the release from monocytes of a protein with inhibitory activity for monocyte chemotaxis. PMID:8506953

Tsuruta, T.; Yamamoto, T.; Matsubara, S.; Nagasawa, S.; Tanase, S.; Tanaka, J.; Takagi, K.; Kambara, T.

1993-01-01

140

Cryopreservation of Dendritic Cells Grown in Vitro from Monocytes for Their Future Clinical Use.  

PubMed

Dendritic cells are professional antigen presenting cells which are being used as adjuvants in tumor vaccination trials. Most clinical protocols currently include 4 to 10 weekly infusions of doses > 10(6) cells, each inoculum coming from a simple culture of blood monocytes. In the present study, several millions of dendritic cells from a single leukapheresis were produced; monocytes were isolated by elutriation and then cultured in Teflon bags in presence of 800 U/ml GM-CSF + 100 micro g/ml IL-13 + 10% fetal calf serum (FCS). The dendritic cells from this single batch were aliquoted in many doses for potential multiple infusions and cryopreserved in 10% DMSO + 2% human albumin in Teflon-kapton Fresenius bags either at -1 degrees C/min using a controlled rate freezer, or putting the bags directly in a -80 degrees C mechanical freezer without controlling the temperature rate. Six experiments were carried out. After one month of cryopreservation, the cells were thawed in a 40 degrees C water bath. Before and after freezing, cells were evaluated for immunophenotype (CD1a, CD14, CD40, CD80, CD83, CD86, CD54, CD58, CD16, CD32, CD64 and HLA-DR) and for their capacity to stimulate allogenic (MLR) or autologous (antigen presentation tests) lymphocytes. The results demonstrated that the mean recovery rates after freezing in liquid nitrogen or at -80 degrees C were (67 +/- 14)% and (71 +/- 13)% respectively, without any significant difference between the two techniques. The immunophenotype was not modified by the freezing-thawing procedure, as well as the lymphocyte stimulating capacities. In conclusion, our study showed that substantial numbers of functional DCs can be derived from peripheral blood monocytes using Teflon bags. DCs can be cryopreserved in a good laboratory practice setting for further clinical trials with an acceptable loss of cells and without modification of their functions. PMID:12578659

Cao, Hua; Verg, Véronique; Martinache, Chantal; Leon, Anne; Gorin, Norbert-Claude; Bernard, Jacky; Lopez, Manuel

2000-12-01

141

Induction of autophagy is essential for monocyte-macrophage differentiation  

PubMed Central

Monocytes are programmed to undergo apoptosis in the absence of stimulation. Stimuli that promote monocyte-macrophage differentiation not only cause cellular changes, but also prevent the default apoptosis of monocytes. In the present study, we demonstrate that autophagy is induced when monocytes are triggered to differentiate and that the induction of autophagy is pivotal for the survival and differentiation of monocytes. We also show that inhibition of autophagy results in apoptosis of cells that are engaged in differentiation. We found that the differentiation signal releases Beclin1 from Bcl-2 by activating JNK and blocks Atg5 cleavage, both of which are critical for the induction of autophagy. Preventing autophagy induction hampers differentiation and cytokine production; therefore, autophagy is an important transition from monocyte apoptosis to differentiation. PMID:22223827

Zhang, Yan; Morgan, Michael J.; Chen, Kun; Choksi, Swati

2012-01-01

142

Ebola Virus Exploits a Monocyte Differentiation Program To Promote Its Entry  

PubMed Central

Antigen-presenting cells (APCs) are critical targets of Ebola virus (EBOV) infection in vivo. However, the susceptibility of monocytes to infection is controversial. Studies indicate productive monocyte infection, and yet monocytes are also reported to be resistant to EBOV GP-mediated entry. In contrast, monocyte-derived macrophages and dendritic cells are permissive for both EBOV entry and replication. Here, freshly isolated monocytes are demonstrated to indeed be refractory to EBOV entry. However, EBOV binds monocytes, and delayed entry occurs during monocyte differentiation. Cultured monocytes spontaneously downregulate the expression of viral entry restriction factors such as interferon-inducible transmembrane proteins, while upregulating the expression of critical EBOV entry factors cathepsin B and NPC1. Moreover, these processes are accelerated by EBOV infection. Finally, ectopic expression of NPC1 is sufficient to rescue entry into an undifferentiated, normally nonpermissive monocytic cell line. These results define the molecular basis for infection of APCs and suggest means to limit APC infection. PMID:23345511

Martinez, Osvaldo; Johnson, Joshua C.; Honko, Anna; Yen, Benjamin; Shabman, Reed S.; Hensley, Lisa E.; Olinger, Gene G.

2013-01-01

143

Role of Cross-Talk between IFN--Induced Monocyte-Derived Dendritic Cells and NK Cells in Priming CD8 T Cell Responses against Human Tumor Antigens1  

Microsoft Academic Search

In the present study we evaluated the role of IFN- in the generation of dendritic cells (IFN-DCs) with priming activity on CD8 T lymphocytes directed against human tumor Ags. A 3-day treatment of monocytes, obtained as adherent PBMCs from HLA- A*0201 healthy donors, with IFN- and GM-CSF led to the differentiation of DCs displaying a semimature phenotype, but promptly inducing

Diego Tosi; Roberta Valenti; Agata Cova; Gloria Sovena; Veronica Huber; Lorenzo Pilla; Flavio Arienti; Filippo Belardelli; Giorgio Parmiani; Licia Rivoltini

144

Monocyte heterogeneity underlying phenotypic changes in monocytes according to SIV disease stage  

PubMed Central

Infection by HIV is associated with the expansion of monocytes expressing CD16 antigens, but the significance of this in HIV pathogenesis is largely unknown. In rhesus macaques, at least three subpopulations of blood monocytes were identified based on their expression of CD14 and CD16: CD14highCD16?, CD14highCD16low, and CD14lowCD16high. The phenotypes and functions of these subpopulations, including CD16+ monocytes, were investigated in normal, uninfected rhesus macaques and macaques that were infected with SIV or chimeric SHIV. To assess whether these different monocyte subpopulations expand or contract in AIDS pathogenesis, we conducted a cross-sectional study of 54 SIV- or SHIV-infected macaques and 48 uninfected controls. The absolute numbers of monocyte populations were examined in acutely infected animals, chronically infected animals with no detectable plasma virus RNA, chronically infected animals with detectable plasma virus RNA, and animals that died with AIDS. The absolute numbers of CD14highCD16low and CD14lowCD16high monocytes were elevated significantly in acutely infected animals and chronically infected animals with detectable plasma virus RNA compared with uninfected controls. Moreover, a significant, positive correlation was evident between the number of CD14highCD16low or CD14lowCD16high monocytes and plasma viral load in the infected cohort. These data show the dynamic changes of blood monocytes, most notably, CD14highCD16low monocytes during lentiviral infection, which are specific to disease stage. PMID:19843579

Kim, Woong-Ki; Sun, Yue; Do, Hien; Autissier, Patrick; Halpern, Elkan F.; Piatak, Michael; Lifson, Jeffrey D.; Burdo, Tricia H.; McGrath, Michael S.; Williams, Kenneth

2010-01-01

145

Results of a phase 1 study utilizing monocyte-derived dendritic cells pulsed with tumor RNA in children and young adults with brain cancer1  

PubMed Central

We conducted a phase 1 study of 9 pediatric patients with recurrent brain tumors using monocyte-derived dendritic cells pulsed with tumor RNA to produce antitumor vaccine (DCRNA) preparations. The objectives of this study included (1) establishing safety and feasibility and (2) measuring changes in general, antigen-specific, and tumor-specific immune responses after DCRNA. Dendritic cells were derived from freshly isolated monocytes after 7 days of culture with IL-4 and granulocyte-macrophage colony–stimulating factor, pulsed with autologous tumor RNA, and then cryopreserved. Patients received at least 3 vaccines, each consisting of an intravenous and an intra-dermal administration at biweekly intervals. The study showed that this method for producing and administering DCRNA from a single leukapheresis product was both feasible and safe in this pediatric brain tumor population. Immune function at the time of enrollment into the study was impaired in all patients tested. While humoral responses to recall antigens (diphtheria and tetanus) were intact in all patients, cellular responses to mitogen and recall antigens were below normal. Following DCRNA vaccine, 2 of 7 patients showed stable clinical disease and 1 of 7 showed a partial response. Two of 7 patients who were tested showed a tumor-specific immune response to DCRNA. This study showed that DCRNA vaccines are both safe and feasible in children with tumors of the central nervous system with a single leukapheresis. PMID:15279716

Caruso, Denise A.; Orme, Lisa M.; Neale, Alana M.; Radcliff, Fiona J.; Amor, Gerlinda M.; Maixner, Wirginia; Downie, Peter; Hassall, Timothy E.; Tang, Mimi L.K.; Ashley, David M.

2004-01-01

146

The influence of diet and vaccination on thymus-dependent (T) lymphocytes in experimental pulmonary tuberculosis  

E-print Network

by an erythematous induration resulting from the infiltration of lymphocytes and monocytes. Though probably protective to the host, this response may also have a deleterious effect (25). In the presence of an excessive antigenic load, the host hypersensitivity...

Bartow, Rebecca Ann

1986-01-01

147

GENE INDUCTION DURING DIFFERENTIATION OF HUMAN MONOCYTES INTO DENDRITIC CELLS : AN INTEGRATED STUDY AT THE RNA AND PROTEIN LEVELS  

E-print Network

populations of precursor cells, either CD1a- CD14+ or CD1a+ CD14- , are observed. The CD1a+ population give the CD14+ generate DCs devoid of such organelles. These two types of DC populations are also functionally different since only the DCs derived from CD14+ precursors are involved in the stimulation of B lymphocytes

Paris-Sud XI, Université de

148

LILRA2 Selectively Modulates LPS-Mediated Cytokine Production and Inhibits Phagocytosis by Monocytes  

Microsoft Academic Search

The activating immunoglobulin-like receptor, subfamily A, member 2 (LILRA2) is primarily expressed on the surface of cells of the innate immunity including monocytes, macrophages, neutrophils, basophils and eosinophils but not on lymphocytes and NK cells. LILRA2 cross-linking on monocytes induces pro-inflammatory cytokines while inhibiting dendritic cell differentiation and antigen presentation. A similar activating receptor, LILRA4, has been shown to modulate

Hao K. Lu; Ainslie Mitchell; Yasumi Endoh; Taline Hampartzoumian; Owen Huynh; Luis Borges; Carolyn Geczy; Katherine Bryant; Nicodemus Tedla

2012-01-01

149

Monocyte activation in patients with Wegener's granulomatosis  

PubMed Central

OBJECTIVE—Wegener's granulomatosis (WG) is an inflammatory disorder characterised by granulomatous inflammation, vasculitis, and necrotising vasculitis and is strongly associated with anti-neutrophil cytoplasmic antibodies (ANCA). Activated monocytes/macrophages are present in renal biopsy specimens and participate in granuloma formation by synthesising and secreting a variety of chemoattractants, growth factors, and cytokines. In view of these findings, in vivo monocyte activation was evaluated in patients with WG and the findings related to parameters of clinical disease activity.?METHODS—Monocyte activation was analysed by measuring plasma concentrations of soluble products of monocyte activation, that is neopterin and interleukin 6 (IL6), by ELISA, and by quantitating the surface expression of activation markers on circulating monocytes by flow cytometry.?RESULTS—Twenty four patients with active WG were included in this study. Ten of these patients were also analysed at the time of remission. Twelve patients with sepsis served as positive controls, and 10 healthy volunteers as negative controls for monocyte activation. Patients with active disease had increased monocyte activation compared with healthy controls as shown by increased concentrations of neopterin (p <0.0001) and increased surface expression of CD11b (p < 0.05) and CD64 (p < 0.05). In those patients with increased concentrations of IL6 during active disease plasma concentrations of IL6 decreased during follow up when patients went into remission (p < 0.0001). In addition, neopterin (r = 0.37, r = 0.44), IL6 (r = 0.37, r = 0.60) and CD63 expression (r = 0.39, r = 0.45) correlated significantly with disease activity as measured by the Birmingham Vasculitis Activity Score and C reactive protein values, respectively. Compared with patients with sepsis, all markers of monocyte activation in patients with vasculitis were lower.?CONCLUSION—It is concluded that disease activity in WG correlates with the extent of activation of monocytes, compatible with their role in the pathophysiology of this disease.?? Keywords: anti-neutrophil cytoplasmic antibody; monocyte activation; vasculitis; flow cytometry PMID:10364903

Kobold, A.; Kallenberg, C.; Tervaert, J. W.

1999-01-01

150

Sex Differences in Monocyte Activation in Systemic Lupus Erythematosus (SLE)  

PubMed Central

Introduction TLR7/8 and TLR9 signaling pathways have been extensively studied in systemic lupus erythematosus (SLE) as possible mediators of disease. Monocytes are a major source of pro-inflammatory cytokines and are understudied in SLE. In the current project, we investigated sex differences in monocyte activation and its implications in SLE disease pathogenesis. Methods Human blood samples from 27 healthy male controls, 32 healthy female controls, and 25 female patients with SLE matched for age and race were studied. Monocyte activation was tested by flow cytometry and ELISA, including subset proportions, CD14, CD80 and CD86 expression, the percentage of IL-6-producing monocytes, plasma levels of sCD14 and IL-6, and urine levels of creatinine. Results Monocytes were significantly more activated in women compared to men and in patients with SLE compared to controls in vivo. We observed increased proportions of non-classic monocytes, decreased proportions of classic monocytes, elevated levels of plasma sCD14 as well as reduced surface expression of CD14 on monocytes comparing women to men and lupus patients to controls. Plasma levels of IL-6 were positively related to sCD14 and serum creatinine. Conclusion Monocyte activation and TLR4 responsiveness are altered in women compared to men and in patients with SLE compared to controls. These sex differences may allow persistent systemic inflammation and resultant enhanced SLE susceptibility. PMID:25485543

Jiang, Wei; Zhang, Lumin; Lang, Ren; Li, Zihai; Gilkeson, Gary

2014-01-01

151

Activated platelets signal chemokine synthesis by human monocytes.  

PubMed Central

Human blood monocytes adhere rapidly and for prolonged periods to activated platelets that display P-selectin, an adhesion protein that recognizes a specific ligand on leukocytes, P-selectin glycoprotein-1. We previously demonstrated that P-selectin regulates expression and secretion of cytokines by stimulated monocytes when it is presented in a purified, immobilized form or by transfected cells. Here we show that thrombin-activated platelets induce the expression and secretion of monocyte chemotactic protein-1 and IL-8 by monocytes. Enhanced monokine synthesis requires engagement of P-selectin glycoprotein-1 on the leukocyte by P-selectin on the platelet. Secretion of the chemokines is not, however, directly signaled by P-selectin; instead, tethering of the monocytes by P-selectin is required for their activation by RANTES (regulated upon activation normal T cell expressed presumed secreted), a platelet chemokine not previously known to induce immediate-early gene products in monocytes. Adhesion of monocytes to activated platelets results in nuclear translocation of p65 (RelA), a component of the NF-kappaB family of transcription factors that binds kappaB sequences in the regulatory regions of monocyte chemotactic protein-1, IL-8, and other immediate-early genes. However, expression of tissue factor, a coagulation protein that also has a kappaB sequence in the 5' regulatory region of its gene, is not induced in monocytes adherent to activated platelets. Thus, contact of monocytes with activated platelets differentially affects the expression of monocyte products. These experiments suggest that activated platelets regulate chemokine secretion by monocytes in inflammatory lesions in vivo and provide a model for the study of gene regulation in cell-cell interactions. PMID:8617886

Weyrich, A S; Elstad, M R; McEver, R P; McIntyre, T M; Moore, K L; Morrissey, J H; Prescott, S M; Zimmerman, G A

1996-01-01

152

Prospective study of prognostic factors in asymptomatic patients with B-cell chronic lymphocytic leukemia-like lymphocytosis: the cut-off of 11?×?10(9)/L monoclonal lymphocytes better identifies subgroups with different outcomes.  

PubMed

The arbitrary threshold of 5?×?10(9)/L chronic lymphocytic leukemia (CLL)-like lymphocytes differentiates monoclonal B lymphocytosis (MBL) from CLL. There are no prospective studies that search for the optimal cut-off of monoclonal lymphocytes able to predict outcome and simultaneously analyze the prognostic value of classic, immunophenotypic, and cytogenetic variables in patients with asymptomatic clonal CLL lymphocytosis (ACL), which includes MBL plus Rai 0 CLL patients. From 2003 to 2010, 231 ACL patients were enrolled in this study. Patients with 11q deletion and atypical lymphocyte morphology at diagnosis had shorter progression-free survival (PFS) (p?=?0.007 and p?=?0.015, respectively) and treatment-free survival (TFS) (p?=?0.009 and p?=?0.017, respectively). Elevated beta-2 microglobulin (B2M) also correlated with worse TFS (p?=?0.002). The optimal threshold of monoclonal lymphocytes independently correlated with survival was 11?×?10(9)/L (p?=?0.000 for PFS and p?=?0.016 for TFS). As conclusion, monoclonal lymphocytosis higher than 11?×?10(9)/L better identifies two subgroups of patients with different outcomes than the standard cut-off value of 5?×?10(9)/L. Atypical lymphocyte morphology, 11q deletion and elevated B2M had a negative impact on the survival in ACL patients. PMID:25471173

Oliveira, A C; Fernández de Sevilla, A; Domingo, A; De La Banda, E; Domingo-Domènech, E; Mercadal, S; Ruiz-Xivillé, N; Alonso, E; Encuentra, M; González-Barca, E

2015-04-01

153

LYMPHOCYTE-LIKE CELLS OF THE TUNICATE, PYURA STOLONIFERA: BINDING OF LECTINS, MORPHOLOGICAL AND FUNCTIONAL STUDIES  

Microsoft Academic Search

In vitro investigations were carried out to determine whether lymphocyte-like (small round) cells of the tunicate Pyura stolonifera react to allogeneic cells and mitogens in a manner comparable to that of vertebrate immunocytes. The lymphocyte-like cells possessed receptors for concanavalin A, wheat germ agglutinin and soybean lectin as shown by binding of radioiodinated lectins in scintillation counting and autoradiographic assays.

Gregory W Warr; Janet M Decker; Thomas E Mandel; Dominick DeLuca; Richard Hudson; John J Marchalonis

1977-01-01

154

Ly6Chigh Monocytes Control Cerebral Toxoplasmosis.  

PubMed

Cerebral infection with the parasite Toxoplasma gondii is followed by activation of resident cells and recruitment of immune cells from the periphery to the CNS. In this study, we show that a subset of myeloid cells, namely Ly6C(high)CCR2(+) inflammatory monocytes that infiltrate the brain upon chronic T. gondii infection, plays a decisive role in host defense. Depletion of this monocyte subset resulted in elevated parasite load and decreased survival of infected mice, suggesting their crucial role. Notably, Ly6C(high)CCR2(+) monocytes governed parasite control due to production of proinflammatory mediators, such as IL-1?, IL-1?, IL-6, inducible NO synthase, TNF, and reactive oxygen intermediate. Interestingly, Ly6C(high)CCR2(+) monocytes were also able to produce the regulatory cytokine IL-10, revealing their dual feature. Moreover, we confirmed by adoptive transfer that the recruited monocytes further develop into two distinct subpopulations contributing to parasite control and profound host defense. The differentiated Ly6C(int)CCR2(+)F4/80(int) subset upregulated MHC I and MHC II molecules, suggesting dendritic cell properties such as interaction with T cells, whereas the Ly6C(neg)F4/80(high) cell subset displayed elevated phagocytic capacity while upregulating triggering receptor expressed on myeloid cells-2. Finally, we have shown that the recruitment of Ly6C(high) monocytes to the CNS is regulated by P-selectin glycoprotein ligand-1. These results indicate the critical importance of recruited Ly6C(high) monocytes upon cerebral toxoplasmosis and reveal the behavior of further differentiated myeloid-derived mononuclear cell subsets in parasite control and immune regulation of the CNS. PMID:25710908

Biswas, Aindrila; Bruder, Dunja; Wolf, Susanne A; Jeron, Andreas; Mack, Matthias; Heimesaat, Markus M; Dunay, Ildiko Rita

2015-04-01

155

A dose escalation feasibility study of lenalidomide for treatment of symptomatic, relapsed chronic lymphocytic leukemia?  

PubMed Central

Adequate dosing of lenalidomide in Chronic Lymphocytic Leukemia (CLL) remains unclear. This study determined maximum tolerated dose (MTD) in relapsed CLL patients (Cohort A) and patients achieving a partial response (PR) or better to recent therapy (Cohort B). Thirty-seven patients were enrolled. MTD was 2.5 mg followed by 5.0 mg continuous. In Cohort A, tumor flare grade 1–2 occurred in 15 patients (50%) and grade 3 in 1 patient (3%). Cohort A had 19 of 23 evaluable (83%) patients, 4 PR (17%) and 15 (65%) stable disease (SD), Cohort B had 6 of 7 patients (86%) with SD. Despite overall response rate not being high, many patients remained on therapy several months with SD. PMID:25082342

Maddocks, Kami; Ruppert, Amy S.; Browning, Rebekah; Jones, Jeffrey; Flynn, Joseph; Kefauver, Cheryl; Gao, Yue; Jiang, Yao; Rozewski, Darlene M.; Poi, Ming; Phelps, Mitch A.; Harper, Erica; Johnson, Amy J.; Byrd, John C.; Andritsos, Leslie A.

2015-01-01

156

A dose escalation feasibility study of lenalidomide for treatment of symptomatic, relapsed chronic lymphocytic leukemia.  

PubMed

Adequate dosing of lenalidomide in Chronic Lymphocytic Leukemia (CLL) remains unclear. This study determined maximum tolerated dose (MTD) in relapsed CLL patients (Cohort A) and patients achieving a partial response (PR) or better to recent therapy (Cohort B). Thirty-seven patients were enrolled. MTD was 2.5mg followed by 5.0mg continuous. In Cohort A, tumor flare grade 1-2 occurred in 15 patients (50%) and grade 3 in 1 patient (3%). Cohort A had 19 of 23 evaluable (83%) patients, 4 PR (17%) and 15 (65%) stable disease (SD), Cohort B had 6 of 7 patients (86%) with SD. Despite overall response rate not being high, many patients remained on therapy several months with SD. PMID:25082342

Maddocks, Kami; Ruppert, Amy S; Browning, Rebekah; Jones, Jeffrey; Flynn, Joseph; Kefauver, Cheryl; Gao, Yue; Jiang, Yao; Rozewski, Darlene M; Poi, Ming; Phelps, Mitch A; Harper, Erica; Johnson, Amy J; Byrd, John C; Andritsos, Leslie A

2014-09-01

157

Serum and Lymphocytic Neurotrophins Profiles in Systemic Lupus Erythematosus: a Case-Control Study  

PubMed Central

Background Neurotrophins play a central role in the development and maintenance of the nervous system. However, neurotrophins can also modulate B and T cell proliferation and activation, especially via autocrine loops. We hypothesized that both serum and lymphocytic neurotrophin levels may be deregulated in systemic Lupus erythematosus (SLE) and may reflect clinical symptoms of the disease. Methods Neurotrophins in the serum (ELISA tests) and lymphocytes (flow cytometry) were measured in 26 SLE patients and 26 control subjects. Th1 (interferon-?) and Th2 (IL-10) profiles and serum concentration of BAFF were assessed by ELISA in the SLE and control subjects. Findings We have demonstrated that both NGF and BDNF serum levels are higher in SLE patients than healthy controls (p=0.003 and p<0.001), independently of Th1 or Th2 profiles. Enhanced serum NT-3 levels (p=0.003) were only found in severe lupus flares (i.e. SLEDAI ? 10) and significantly correlated with complement activation (decreased CH 50, ?=-0.28, p=0.03). Furthermore, there was a negative correlation between serum NGF levels and the number of circulating T regulatory cells (?=0.48, p=0.01). In circulating B cells, production of both NGF and BDNF was greater in SLE patients than in healthy controls. In particular, the number of NGF-secreting B cells correlated with decreased complement levels (p=0.05). One month after SLE flare treatment, BDNF levels decreased; in contrast, NGF and NT-3 levels remained unchanged. Conclusion This study demonstrates that serum and B cell levels of both NGF and BDNF are increased in SLE, suggesting that the neurotrophin production pathway is deregulated in this disease. These results must be confirmed in a larger study with naive SLE patients, in order to avoid the potential confounding influence of prior immune-modulating treatments on neurotrophin levels. PMID:24223945

Fauchais, Anne-Laure; Lise, Marie-Claude; Marget, Pierre; Lapeybie, François-Xavier; Bezanahary, Holy; Martel, Clothilde; Dumonteil, Stéphanie; Sparsa, Agnès; Lalloué, Fabrice; Ly, Kim; Essig, Marie; Vidal, Elisabeth; Jauberteau, Marie-Odile

2013-01-01

158

Treatment of pustular psoriasis with granulocyte and monocyte adsorption apheresis  

Microsoft Academic Search

We studied the efficacy of granulocyte and monocyte adsorption apheresis in 2 patients with pustular psoriasis, one localized, the other generalized. Treatment with granulocyte and monocyte adsorption apheresis resulted in remarkable clearing of the skin lesions, suggesting that this therapy is a valuable tool for treating patients with intractable skin diseases attributable to activated granulocytes. We present detailed descriptions of

Takuro Kanekura; Noriko Yoshii; Tomokazu Yonezawa; Hisashi Kawabata; Hiroshi Saruwatari; Tamotsu Kanzaki

2003-01-01

159

Differential infection outcome of Chlamydia trachomatis in human blood monocytes and monocyte-derived dendritic cells  

PubMed Central

Background Chlamydia trachomatis is an intracellular bacteria which consist of three biovariants; trachoma (serovars A-C), urogenital (serovars D-K) and lymphogranuloma venereum (L1-L3), causing a wide spectrum of disease in humans. Monocytes are considered to disseminate this pathogen throughout the body while dendritic cells (DCs) play an important role in mediating immune response against bacterial infection. To determine the fate of C. trachomatis within human peripheral blood monocytes and monocyte-derived DCs, these two sets of immune cells were infected with serovars Ba, D and L2, representative of the three biovariants of C. trachomatis. Results Our study revealed that the different serovars primarily infect monocytes and DCs in a comparable fashion, however undergo differential infection outcome, serovar L2 being the only candidate to inflict active infection. Moreover, the C. trachomatis serovars Ba and D become persistent in monocytes while the serovars predominantly suffer degradation within DCs. Effects of persistence gene Indoleamine 2, 3-dioxygenase (IDO) was not clearly evident in the differential infection outcome. The heightened levels of inflammatory cytokines secreted by the chlamydial infection in DCs compared to monocytes seemed to be instrumental for this consequence. The immune genes induced in monocytes and DCs against chlamydial infection involves a different set of Toll-like receptors, indicating that distinct intracellular signalling pathways are adopted for immune response. Conclusion Our results demonstrate that the host pathogen interaction in chlamydia infection is not only serovar specific but manifests cell specific features, inducing separate immune response cascade in monocytes and DCs. PMID:25123797

2014-01-01

160

Effect of infection with BHV-1 on peripheral blood leukocytes and lymphocyte subpopulations in calves with subclinical BVD.  

PubMed

Bovine viral diarrhea virus (BVDV) and bovine herpesvirus-1 (BHV-1) are important cattle pathogens that induce a broad immunosuppression on cell-mediated immune response on its own participating in the bovine respiratory disease complex (BRDC). The aim of our study was to evaluate the quantitative changes in immunocompetent cells in healthy calves and calves with subclinical bovine viral diarrhea (BVD), both inoculated with BHV-1. Total leukocyte counts exhibited changes mainly in neutrophils and lymphocytes that can contribute to the BVDV immunosuppression, thus accounting for some of the intergroup differences. Monocytes did not display numerical changes in either group. Regarding lymphocyte subpopulations, even though CD4+ T lymphocytes and B cells were depleted around 4 dpi in both infected groups, the main difference observed between both groups was in CD8+ T cells which displayed an earlier depletion in BVDV inoculated calves that can promote a greater BHV-1 dissemination, thus aggravating the course of the disease. PMID:23541923

Molina, V; Risalde, M A; Sánchez-Cordón, P J; Pedrera, M; Romero-Palomo, F; Luzzago, C; Gómez-Villamandos, J C

2013-08-01

161

Lymphocyte Adhesion to Candida albicans  

PubMed Central

Adherence of lymphocytes to the fungus is the first step in the direct lymphocyte-mediated antifungal effect against Candida albicans. In this study we identified macrophage-1 antigen (Mac-1) (CD11b/CD18, ?M/?2) as the lymphocyte surface structure responsible for the adhesion of activated lymphocytes to the hyphal form of the fungus. Antibodies specific for epitopes of the ?-subunit (CD11b) and the ?2-subunit (CD18) of Mac-1 were shown to completely eliminate lymphocyte adhesion to C. albicans hyphae. Lymphocyte adhesion to C. albicans was also inhibited significantly by known ligands of Mac-1, including the extracellular matrix proteins laminin and fibrinogen, as well as engineered peptides containing arginine-glycine-aspartic acid sequences and the disintegrin echistatin. N-Acetyl-d-glucosamine and ?-glucan, which inhibit Mac-1-mediated adhesion to the yeast, blocked lymphocyte adhesion to hyphae. NIH 3T3 fibroblast transfectants expressing human CD11b/CD18 bound to C. albicans, and their binding was inhibited by antibodies specific for CD11b/CD18. Finally, antibodies specific for CD11b/CD18 effectively inhibited the capacity of activated lymphocytes to have an antifungal effect against hyphae. Our results clearly identify Mac-1 (CD11b/CD18) as the lymphocyte surface structure that mediates activated lymphocyte adhesion to C. albicans and the resultant antifungal effect of the lymphocytes. PMID:11796578

Forsyth, Christopher B.; Mathews, Herbert L.

2002-01-01

162

Activation of CD14 on circulating monocytes in patients with acute coronary syndrome  

Microsoft Academic Search

Background: Increasing evidence supports the involvement of inflammation in acute phase of coronary artery diseases. Methods: We analyzed the status of activation of inflammatory cells in 38 patients with acute coronary syndrome, 14 stable angina patients, and 19 control subjects by flow-cytometry. Expression levels of CD14 and the percentage of HLA-DR+ T-lymphocytes were used as markers of monocyte and T-lymphocytes

Won-Ha Lee; Yoon Lee; Jin-Ok Jeong; Sung-Youn Lee; Yoon-Ho Choi; Jeong-Euy Park

2001-01-01

163

Comparative studies of mitogen- and antigen-induced lymphocyte proliferation in four captive rhinoceros species.  

PubMed

Cellular immune function in four rhinoceros species was evaluated by way of in vitro lymphocyte proliferation responses to mitogenic and antigenic stimuli to establish normative data on white blood cell activity for each species and to identify species-specific differences that might help explain the predisposition of black rhinoceroses (Diceros bicornis) to disease. A cross section of the U.S. rhinoceros population encompassing all four captive species was sampled, including the Sumatran rhinoceros (Dicerorhinus sumatrensis) (n = 3); Indian rhinoceros (Rhinoceros unicornis) (n = 4); African black rhinoceros (n = 16); and African white rhinoceros (Ceratotherium simum) (n = 10). Of the four species evaluated, African black rhinoceroses exhibited the weakest (P < 0.05) lymphocyte proliferative responses to the mitogens: pokeweed (0.1 microg/ml), phytohemagglutinin (0.3 microg/ml), and concanavalin A (5.0 microg/ml). Total cell density at the end of culture was only 70% of that achieved with lymphocytes isolated from African white rhinoceroses, Indian rhinoceroses, and Sumatran rhinoceroses. However, lymphocyte response to bacterial endotoxin lipopolysaccharide was similar (P > 0.05) across species. Antigenic stimulation produced much weaker responses than mitogenic stimulation. No differences (P > 0.05) were observed among rhinoceros species in response to 1 and 10 microg/ml of Leptospira icterohemorrhagiae or Leptospira gryppotyphosa. Lymphocytes from African white rhinoceroses proliferated weakly in the presence of Aspergillus fumigatus filtrate, whereas lymphocytes from the southern black rhinoceros subspecies appeared slightly suppressed in the presence of increasing doses (0.1, 1, and 10 microg/ml) of Aspergillus filtrate. This comparative data set characterizing lymphocyte proliferation in the rhinoceros reveals several differences in immune cell responses among rhinoceros species and provides some evidence that lymphocytes of captive African black rhinoceroses are less vigorous than those of the other rhinoceros species. PMID:15732584

Vance, Carrie K; Kennedy-Stoskopf, Suzanne; Obringer, Amy R; Roth, Terri L

2004-12-01

164

Transitional B lymphocytes are associated with protection from kidney allograft rejection: a prospective study.  

PubMed

Recent cross-sectional studies suggest an important role for transitional B lymphocytes (CD19?+?CD24hiCD38hi) in promoting transplant tolerance, and protecting from late antibody-mediated rejection (ABMR). However, prospective studies are lacking. This study enrolled 73 de novo transplant recipients, and collected serial clinical, immunological and biochemical information over 48?±?6 months. Cell phenotyping was conducted immediately prior to transplantation, and then on five occasions during the first year posttransplantation. When modeled as a time-dependent covariate, transitional B cell frequencies (but not total B cells or "regulatory" T cells) were associated with protection from acute rejection (any Banff grade; HR: 0.60; 95% CI: 0.37-0.95; p?=?0.03). No association between transitional B cell proportions and either de novo donor-specific or nondonor-specific antibody (dnDSA; dnNDSA) formation was evident, although preserved transitional B cell proportions were associated with reduced rejection rates in those patients developing dnDSA. Three episodes of ABMR occurred, all in the context of nonadherence, and all associated with in vitro anti-HLA T cell responses in an ELISPOT assay (p?=?0.008 versus antibody-positive patients not experiencing ABMR). This prospective study supports the potential relevance of transitional ("regulatory") B cells as a biomarker and therapeutic intervention in transplantation, and highlights relationships between humoral immunity, cellular immunity and nonadherence. PMID:25808898

Shabir, S; Girdlestone, J; Briggs, D; Kaul, B; Smith, H; Daga, S; Chand, S; Jham, S; Navarrete, C; Harper, L; Ball, S; Borrows, R

2015-05-01

165

Monocyte Subsets in Schistosomiasis Patients with Periportal Fibrosis  

PubMed Central

A major issue with Schistosoma mansoni infection is the development of periportal fibrosis, which is predominantly caused by the host immune response to egg antigens. Experimental studies have pointed to the participation of monocytes in the pathogenesis of liver fibrosis. The aim of this study was to characterize the subsets of monocytes in individuals with different degrees of periportal fibrosis secondary to schistosomiasis. Monocytes were classified into classical (CD14++CD16?), intermediate (CD14++CD16+), and nonclassical (CD14+CD16++). The expressions of monocyte markers and cytokines were assessed using flow cytometry. The frequency of classical monocytes was higher than the other subsets. The expression of HLA-DR, IL-6, TNF-?, and TGF-? was higher in monocytes from individuals with moderate to severe fibrosis as compared to other groups. Although no differences were observed in receptors expression (IL-4R and IL-10R) between groups of patients, the expression of IL-12 was lower in monocytes from individuals with moderate to severe fibrosis, suggesting a protective role of this cytokine in the development of fibrosis. Our data support the hypothesis that the three different monocyte populations participate in the immunopathogenesis of periportal fibrosis, since they express high levels of proinflammatory and profibrotic cytokines and low levels of regulatory markers. PMID:24757288

Fernandes, Jamille Souza; Araujo, Maria Ilma; Lopes, Diego Mota; de Souza, Robson da Paixão; Carvalho, Edgar M.; Cardoso, Luciana Santos

2014-01-01

166

Serial characterisation of monocyte and neutrophil function after lung resection  

PubMed Central

Objectives The primary aim of this prospective study was to perform a comprehensive serial characterisation of monocyte and neutrophil function, circulating monocyte subsets, and bronchoalveolar lavage (BAL) fluid after lung resection. A secondary aim was to perform a pilot, hypothesis-generating evaluation of whether innate immune parameters were associated with postoperative pneumonia. Methods Forty patients undergoing lung resection were studied in detail. Blood monocytes and neutrophils were isolated preoperatively and at 6, 24 and 48?h postoperatively. BAL was performed preoperatively and immediately postoperatively. Monocyte subsets, monocyte responsiveness to lipopolysaccharide (LPS) and neutrophil phagocytic capacity were quantified at all time points. Differential cell count, protein and cytokine concentrations were measured in BAL. Pneumonia evaluation at 72?h was assessed using predefined criteria. Results After surgery, circulating subsets of classical and intermediate monocytes increased significantly. LPS-induced release of proinflammatory cytokines from monocytes increased significantly and by 48?h a more proinflammatory profile was found. Neutrophil phagocytosis demonstrated a small but significant fall. Factors associated with postoperative pneumonia were: increased release of specific proinflammatory and anti-inflammatory cytokines from monocytes; preoperative neutrophilia; and preoperative BAL cell count. Conclusions We conclude that postoperative lung inflammation is associated with specific changes in the cellular innate immune response, a better understanding of which may improve patient selection and prediction of complications in the future. PMID:25478189

Jones, Richard O; Brittan, Mairi; Anderson, Niall H; Conway Morris, Andrew; Murchison, John T; Walker, William S; Simpson, A John

2014-01-01

167

The influence of aminophylline on the nanostructure and nanomechanics of T lymphocytes: an AFM study  

NASA Astrophysics Data System (ADS)

Although much progress has been made in the illustration of the mechanism of aminophylline (AM) treating asthma, there is no data about its effect on the nanostructure and nanomechanics of T lymphocytes. Here, we presented atomic force spectroscopy (AFM)-based investigations at the nanoscale level to address the above fundamental biophysical questions. As increasing AM treatment time, T lymphocytes' volume nearly double increased and then decreased. The changes of nanostructural features of the cell membrane, i.e., mean height of particles, root-mean-square roughness (Rq), crack and fragment appearance, increased with AM treatment time. T lymphocytes were completely destroyed with 96-h treatment, and they existed in the form of small fragments. Analysis of force-distance curves showed that the adhesion force of cell surface decreased significantly with the increase of AM treatment time, while the cell stiffness increased firstly and then decreased. These changes were closely correlated to the characteristics and process of cell oncosis. In total, these quantitative and qualitative changes of T lymphocytes' structure and nanomechanical properties suggested that AM could induce T lymphocyte oncosis to exert anti-inflammatory effects for treating asthma. These findings provide new insights into the T lymphocyte oncosis and the anti-inflammatory mechanism and immune regulation actions of AM.

Huang, Xun; He, Jiexiang; Liu, Mingxian; Zhou, Changren

2014-09-01

168

The influence of aminophylline on the nanostructure and nanomechanics of T lymphocytes: an AFM study  

PubMed Central

Although much progress has been made in the illustration of the mechanism of aminophylline (AM) treating asthma, there is no data about its effect on the nanostructure and nanomechanics of T lymphocytes. Here, we presented atomic force spectroscopy (AFM)-based investigations at the nanoscale level to address the above fundamental biophysical questions. As increasing AM treatment time, T lymphocytes' volume nearly double increased and then decreased. The changes of nanostructural features of the cell membrane, i.e., mean height of particles, root-mean-square roughness (Rq), crack and fragment appearance, increased with AM treatment time. T lymphocytes were completely destroyed with 96-h treatment, and they existed in the form of small fragments. Analysis of force-distance curves showed that the adhesion force of cell surface decreased significantly with the increase of AM treatment time, while the cell stiffness increased firstly and then decreased. These changes were closely correlated to the characteristics and process of cell oncosis. In total, these quantitative and qualitative changes of T lymphocytes' structure and nanomechanical properties suggested that AM could induce T lymphocyte oncosis to exert anti-inflammatory effects for treating asthma. These findings provide new insights into the T lymphocyte oncosis and the anti-inflammatory mechanism and immune regulation actions of AM. PMID:25258618

2014-01-01

169

Association of Streptococcus equi with equine monocytes.  

PubMed

Streptococcus equi (Se), the cause of equine strangles, is highly resistant to phagocytosis by neutrophils and is usually classified as an extracellular pathogen. Large numbers of the organism in tonsillar tissues during the acute phase of the disease are completely eliminated during convalescence by mechanisms not yet understood. In this study we demonstrate in an opsono-bactericidal assay and by cytometry and confocal microscopy that Se is interiorized and killed by equine blood monocytes. This finding supports the hypotheses that adaptive immune clearance is mediated by tonsillar macrophages and that macrophages monocytes could serve as a vehicle for transport from the tonsil to local lymph nodes. PMID:21752476

Mérant, Catherine; Sheoran, Abhineet; Timoney, John F

2011-09-15

170

Automated image analysis in the study of lymphocyte subpopulation in eosinophilic oesophagitis  

PubMed Central

Background Eosinophilic oesophagitis (EoE) is characterized by the presence of eosinophils in oesophageal mucosa. Other inflammatory cells, mainly lymphocytes, dendritic cells, and mast cells may also play an important role in this disease. The aim of this study is to compare the inflammatory pattern of the mucosa between EoE and gastro-oesophageal reflux disease (GERD), using automatic image analysis in digital slides, and to assess treatment response after elimination diet and food challenge test. Methods From 2010 to 2013, 35 oesophageal biopsies from EoE and GERD patients were randomly selected. In six EoE biopsies, patients had been treated with selective food exclusion diet. Immunohistochemical study with CD3, CD20, CD4, and CD8 for lymphocyte populations, CD1a for dendritic cells, and CD117/c-kit for mast cells was performed. Slides were scanned using Leica Aperio Scanscope XT with 40× magnification. Immunohistochemical expression was quantified in 245 immunohistochemistry digital slides with Leica Aperio positive pixel count algorithm using two different approaches: whole slide analysis versus selection of a 2 mm2 hot spot area. Results Average eosinophil cell count was significantly higher (p < 0.001) in the first biopsy of EoE patients before treatment (30.75 eosinophils per high power field - HPF) than in GERD patients (0.85 eosinophils/HPF) or in EoE patients after treatment with elimination diet (1.60 eosinophils/HPF). In the immunohistochemical study, manual count and automatic image analysis showed a significant increase in the number of CD3 and CD8 cells in EoE patients, compared with GERD patients. However, the increase of CD117/c-kit was only statistically significant when manual counting procedures were used. CD20 positive cell count also showed a non-statistically significant tendency to reduce after elimination diet treatment. Manual eosinophil count correlated much better with CD3 and CD8 count using hot spot approach than with a whole slide approach. Conclusions Positive pixel count algorithm can be a useful tool to quantify the immunohistochemical expression of inflammatory cells in the diagnosis and follow up of eosinophilic oesophagitis. PMID:25565117

2014-01-01

171

Superoxide generation in transformed B-lymphocytes from patients with severe, malignant osteopetrosis.  

PubMed

Severe, malignant osteopetrosis is a disease characterized by osteoclasts that fail to resorb bone. Serious defects in the ability of white blood cells to eradicate infectious agents confound the clinical course. Defective superoxide generation by neutrophils, monocytes, and lymphocytes contributes to this inability to fight infection. To elucidate the mechanisms resulting in the defective superoxide generation observed in osteopetrotic leukocytes, gene expression, translocation, and phosphorylation of the major components that form the functional NADPH oxidase complex were studied in transformed B-lymphocytes. The expression of the p47 subunit of NADPH oxidase was reduced in B-lymphocytes collected from osteopetrotic patients compared to those from controls. Phosphorylation and translocation of p47 to the cell membrane after PMA stimulation was similar in B-lymphocytes from both patients and normal controls. However, total amount of p47 phosphorylation and translocation was reduced in patient samples. This was further supported by the experiment using p47 antisense oligonucleotide. The other major components of the oxidase (p91, p22, p67) were found to be present at normal levels. Thus, the reduction in p47 expression results in reduced ability to assemble a functional NADPH oxidase complex at the membrane of lymphocytes from osteopetrotic patients. This defect translates into reduced superoxide generation and an increased propensity for infection. PMID:10544947

Yang, S; Ries, W L; Key, L L

1999-09-01

172

Endogenous production of interleukin 15 by activated human monocytes is critical for optimal production of interferon-gamma by natural killer cells in vitro.  

PubMed Central

Natural killer (NK) cells are large granular lymphocytes that constitutively express functional IL-2 receptors. We have shown that recombinant human IL-15 uses the IL-2 receptor to activate human NK cells and can synergize with recombinant human IL-12 to stimulate NK cell production of IFN-gamma in vitro. IFN-gamma production by NK cells is critical in the prevention of overwhelming infection by obligate intracellular microbial pathogens in several experimental animal models. Herein, we demonstrate that human monocytes produce IL-15 protein within 5 h of activation with LPS. Using an IL-15-neutralizing antiserum in a coculture of LPS-activated monocytes and NK cells, we demonstrate that monocyte-derived IL-15 is critical for optimal NK cell production of IFN-gamma. Endogenous IL-15 activates NK cells through the IL-2 receptor, and with endogenous IL-12, regulates NK cell IFN-gamma after monocyte activation by LPS. These in vitro studies are the first to characterize a function for endogenous IL-15, and as such, suggest an important role for IL-15 during the innate immune response. IL-15 may be an important ligand for the NK cell IL-2 receptor in vivo. Images PMID:8675621

Carson, W E; Ross, M E; Baiocchi, R A; Marien, M J; Boiani, N; Grabstein, K; Caligiuri, M A

1995-01-01

173

Antiviral Regulation in Porcine Monocytic Cells at Different Activation States  

PubMed Central

ABSTRACT Monocytic cells, including macrophages and dendritic cells, exist in different activation states that are critical to the regulation of antimicrobial immunity. Many pandemic viruses are monocytotropic, including porcine reproductive and respiratory syndrome virus (PRRSV), which directly infects subsets of monocytic cells and interferes with antiviral responses. To study antiviral responses in PRRSV-infected monocytic cells, we characterized inflammatory cytokine responses and genome-wide profiled signature genes to investigate response pathways in uninfected and PRRSV-infected monocytic cells at different activation states. Our findings showed suppressed interferon (IFN) production in macrophages in non-antiviral states and an arrest of lipid metabolic pathways in macrophages at antiviral states. Importantly, porcine monocytic cells at different activation states were susceptible to PRRSV and responded differently to viral infection. Based on Gene Ontology (GO) analysis, two approaches were used to potentiate antiviral activity: (i) pharmaceutical modulation of cellular lipid metabolism and (ii) in situ PRRSV replication-competent expression of interferon alpha (IFN-?). Both approaches significantly suppressed exogenous viral infection in monocytic cells. In particular, the engineered IFN-expressing PRRSV strain eliminated exogenous virus infection and sustained cell viability at 4 days postinfection in macrophages. These findings suggest an intricate interaction of viral infection with the activation status of porcine monocytic cells. An understanding and integration of antiviral infection with activation status of monocytic cells may provide a means of potentiating antiviral immunity. IMPORTANCE Activation statuses of monocytic cells, including monocytes, macrophages (M?s), and dendritic cells (DCs), are critically important for antiviral immunity. Unfortunately, the activation status of porcine monocytic cells or how cell activation status functionally interacts with antiviral immunity remains largely unknown. This is a significant omission because many economically important porcine viruses are monocytotropic, including our focus, PRRSV, which alone causes nearly $800 million economic loss annually in the U.S. swine industries. PRRSV is ideal for deciphering how monocytic cell activation statuses interact with antiviral immunity, because it directly infects subsets of monocytic cells and subverts overall immune responses. In this study, we systematically investigate the activation status of porcine monocytic cells to determine the intricate interaction of viral infection with activation statuses and functionally regulate antiviral immunity within the framework of the activation paradigm. Our findings may provide a means of potentiating antiviral immunity and leading to novel vaccines for PRRS prevention. PMID:25056886

Rowland, Raymond R. R.

2014-01-01

174

Reverse genetic studies of homologous DNA recombination using the chicken B-lymphocyte line, DT40.  

PubMed Central

DT40 is an avian leucosis virus-transformed chicken B-lymphocyte line which exhibits high ratios of targeted to random integration of transfected DNA constructs. This efficient targeted integration may be related to the ongoing diversification of the variable segment of the immunoglobulin gene through homologous DNA recombination-controlled gene conversion. DT40s are a convenient model system for making gene-targeted mutants. Another advantage is the relative tractability of these cells, which makes it possible to disrupt multiple genes in a single cell and to generate conditionally gene-targeted mutants including temperature-sensitive mutants. There are strong phenotypic similarities between murine and DT40 mutants of various genes involved in DNA recombination. These similarities confirm that the DT40 cell line is a reasonable model for the analysis of vertebrate DNA recombination, despite obvious concerns associated with the use of a transformed cell line, which may have certain cell-line-specific characteristics. Here we describe our studies of homologous DNA recombination in vertebrate somatic cells using reverse genetics in DT40 cells. PMID:11205323

Sonoda, E; Morrison, C; Yamashita, Y M; Takata, M; Takeda, S

2001-01-01

175

Interferon-? up-regulates the expression of co-stimulatory molecules CD80, CD86 and CD40 on monocytes: significance for treatment of multiple sclerosis  

PubMed Central

Interferon (IFN)-? reduces the biological activity of multiple sclerosis (MS), a presumably T cell-mediated autoimmune disease of central nervous system (CNS) myelin. Co-stimulatory molecules are necessary for full T cell activation and differential expression of co-stimulatory molecules on antigen-presenting cells is thought to influence the type of effector T cell response (Th1/Th2). In this study we investigated the effects of IFN-? on the expression of co-stimulatory molecules on lymphocytes and monocytes as a potential mechanism of action of IFN-? in MS. Peripheral blood mononuclear cells (PBMCs) were stimulated with IFN-? in vitro and expression of CD80, CD86, CD40 and HLA was examined by flow cytometry and reverse-transcription polymerase chain reaction. Whereas IFN-? had no effect on the expression of these molecules on T and B lymphocytes there was a significant increase on monocytes. Correspondingly, the expression of mRNA increased after 6–18 h. This in vitro response was also observed in untreated MS patients and patients receiving treatment with IFN-?. The increase of co-stimulatory molecules on monocytes was not mediated by interleukin (IL)-10. When IFN-?-stimulated monocytes were used to stimulate autologous T cells an increased secretion of IL-13 was observed. In biopsies taken from IFN-?-induced skin reactions after subcutaneous injection increased expression of CD80 mRNA was detected, indicating that IFN-? also up-regulates this co-stimulatory molecule in vivo. These data provide the background for further studies of IFN-?-induced changes of co-stimulatory molecules in MS patients. PMID:15544628

MARCKMANN, S; WIESEMANN, E; HILSE, R; TREBST, C; STANGEL, M; WINDHAGEN, A

2004-01-01

176

A study of the potential nephrotoxicity of heterologous anti-lymphocyte serum  

PubMed Central

Nephrotoxic serum nephritis as a potential effect of the administration of heterologous anti-lymphocyte serum was investigated in dogs. Horse anti-dog lymphocyte serum, prepared using lymph node cells, was demonstrated by immunofluorescent techniques to possess both in-vitro and in-vivo anti-glomerular antibody activity. Experiments were designed to eliminate as far as possible conditions which would allow a serum sickness type of nephritis to develop, while permitting expression of the putative anti-glomerular antibody activity. While none of the animals receiving anti-lymphocyte serum either subcutaneously or intravenously showed clinical evidence of glomerular injury, in some cases early histological changes were apparent and the reasons for their non-progressive nature are discussed. ImagesFig. 1 PMID:4985162

Orr, W. McN.; Birtch, A. G.; Diethelm, A. G.; Dubernard, J. M.; Duquella, J.; Glassock, R. J.

1970-01-01

177

Sequential studies on synovial lymphocyte stimulation by rubella antigen, and rubella virus isolation in an adult with persistent arthritis  

Microsoft Academic Search

The response of synovial lymphocytes from a 65-year-old lady with persistent polyarthritis, to rubella antigen and a number of other microbial agents was studied over a period of 11 months by [3H]thymidine incorporation. The results were correlated with the ability to isolate rubella virus from both peripheral blood and synovial fluid during the same period. The patient showed initially a

J K Chantler; D M da Roza; M E Bonnie; G D Reid; D K Ford

1985-01-01

178

Further studies on the effect of anti-lymphocytic antibody on humoral antibody formation  

PubMed Central

The effect of 3-, 6- and 12-day courses of anti-lymphocytic IgG treatment (1 ml of 2 g/100 ml) on the primary humoral response of random bred Wistar rats has been investigated. The primary response to alum precipitated bovine serum albumin was suppressed by all these courses. In contrast however the primary response to sheep erythrocytes was suppressed by the 6-day treatment alone or by a 3-day course augmented with azathioprine treatment. Additional experiments performed in hooded rats confirm that prolonged courses of anti-lymphocytic globulin failed to exert an antidotal effect. PMID:5712059

James, K.; Pullar, Diane M.; James, Valerie S.

1968-01-01

179

Comparison of hprt variant frequencies and chromosome aberration frequencies in lymphocytes from radiotherapy and chemotherapy patients: A prospective study  

SciTech Connect

The autoradiographic 6-thioguanine-resistant mutant lymphocyte assay and a chromosome aberration assay were used to determine the time-course of appearance and persistence of elevated frequencies of hprt variants and dicentric chromosomes in patients receiving x-irradiation therapy. The hprt mutation assays were done with frozen/thawed lymphocytes isolated from aliquots of the same blood samples used for the chromosome aberration assays. Five multiple sclerosis patients were also studied before and at 2 and 4 wk intervals after treatment with monthly i.v. doses of 750 mg/m{sup 2} of cyclophosphamide (CP). There were no significant elevations in chromosome aberrations at these post-treatment sample times. The results demonstrate the complementary nature of these two human monitoring assays and emphasize the importance of careful selection of optimal sampling times.

Ammenheuser, M.M.; Au, W.W.; Whorton, E.B. Jr.; Belli, J.A.; Ward, J.B. Jr. (Univ. of Texas Medical Branch, Galveston (United States))

1991-01-01

180

Monoclonal antibodies to antigens on human neutrophils, activated T lymphocytes, and acute leukemia blast cells  

SciTech Connect

The authors describe the production of two mouse hybridomas secreting monoclonal antibodies to antigenic determinants of the surface membranes of human neutrophils, activated T lymphocytes, and acute leukemic blast cells. The degree of lymphocyte stimulation was estimated from incorporation of /sup 3/H-thymidine with parallel microculture. Monoclonal antibodies of supernatants of hybridoma cultures shown here reacted in both immunofluorescence test and cytotoxicity test with surface membrane antigens on the majority of neutrophils and PHA-activated peripheral blood lymphocytes from healthy subjects, but did not give positive reactions with unactivated lymphocytes, adherent monocytes, erythrocytes, and alloantigen-stimulated lymphocytes.

Miterev, G.Yu.; Burova, G.F.; Puzhitskaya, M.S.; Danilevich, S.V.; Bulycheva, T.I.

1987-11-01

181

Expression of fructosyllysine receptors on human monocytes and monocyte-like cell lines.  

PubMed

Short-term exposure of human serum albumin to glucose in vitro results in the formation of fructosyllysine residues. Using short-term glucose-modified albumin the interactions with human monocytes and with the human monocyte-like cells U937, MonoMac 6, HL60, and THP1 were studied. Short-term glycated albumin was specifically bound by monocytes, U937 and MonoMac 6 cells, but not by HL60 and THP1 cells. This specific binding of short-term glycated albumin was inhibited by fructosyllysine, but not by hexitollysine. Short-term glycated albumin did not compete for binding of albumin, modified by advanced glycation end products. Scatchard analysis of the binding data indicated that there are 10,000 binding sites per cell in monocytes or U937 cells and 2000 sites per cell on MonoMac 6 cells with affinity constants of 9 x 10(6) M-1. Specific binding of short-term glycated albumin to human monocytes was observed in 29% of the 101 human subjects investigated. Ligand-receptor cross-linking and ligand blotting experiments revealed two binding proteins of 100 to 110 and 190 kDa in SDS-PAGE after membrane protein solubilization of U937 and MonoMac 6 cells. The binding of short-term glycated albumin to MonoMac 6 cells induced the production of the cytokines IL-1 and TNF. PMID:7718622

Salazar, R; Brandt, R; Krantz, S

1995-04-01

182

Aggressive large granular lymphocyte lymphomas in five dogs: a clinical cytohistological and immunological study  

Microsoft Academic Search

Among 276 canine lymphomas referred to the Haematology–Cytology–Immunology laboratory of the Lyon Veterinary School between 1997 and 2003, there were five aggressive large granular lymphocyte (LGL) malignancies. The five dogs were clinically examined and followed up. Cytological and histological analyses of the liver, spleen, lymph nodes, intestine and bone marrow were performed. The immunophenotype and proliferation index were established. The

V. Turinelli; T. Marchal; F. Ponce; C. Bonnefont-Rebeix; C. Fournel-Fleury

2005-01-01

183

Comparative studies by comet test and SCE analysis in human lymphocytes from 200 healthy subjects  

Microsoft Academic Search

The comet test (single cell gel electrophoresis, SCGE) appears to be a promising tool to estimate DNA damage at the single cell level and it provides information on the presence of damage among individual cells. Previously, we analyzed the degree of DNA damage in peripheral human lymphocytes from 100 healthy subjects living in Pisa (Italy) taking into account age, gender

Cecilia Betti; Tania Davini; Liliana Giannessi; Nicola Loprieno; Roberto Barale

1995-01-01

184

Monocyte transferrin-iron uptake in hereditary hemochromatosis  

SciTech Connect

Transferrin-iron uptake by peripheral blood monocytes was studied in vitro to test the hypothesis that the relative paucity of mononuclear phagocyte iron loading in hereditary hemochromatosis results from a defect in uptake of iron from transferrin. Monocytes from nine control subjects and 17 patients with hemochromatosis were cultured in the presence of 59Fe-labelled human transferrin. There was no difference in 59Fe uptake between monocytes from control subjects and monocytes from patients with hemochromatosis who had been treated by phlebotomy and who had normal body iron stores. However, 59Fe uptake by monocytes from iron-loaded patients with hemochromatosis was significantly reduced compared with either control subjects or treated hemochromatosis patients. It is likely that this was a secondary effect of iron loading since iron uptake by monocytes from treated hemochromatosis patients was normal. Assuming that monocytes in culture reflect mononuclear phagocyte iron metabolism in vivo, this study suggests that the relative paucity of mononuclear phagocyte iron loading in hemochromatosis is not related to an abnormality in transferrin-iron uptake by these cells.

Sizemore, D.J.; Bassett, M.L.

1984-05-01

185

Proteomic analysis of circulating human monocytes in coronary artery disease.  

PubMed

Monocytes play an important role in inflammation and atherosclerosis; however, the molecular details underlying these diverse functions are not completely understood. Proteomic analysis of monocytes can provide new insights into their biological role in coronary artery disease (CAD). Twenty angiographically confirmed male, CAD patients (?50% stenosis) attending cardiology clinic of Nehru Hospital, PGIMER, Chandigarh, and who were not receiving any lipid lowering therapy and 20 TMT negative subjects who served as controls were enrolled in the study. Circulating monocytes isolated from overnight fasting blood samples were analyzed by 2D gel electrophoresis (pH 4-7), and differentially expressed protein spots were subjected to mass spectrometry and identification of proteins. We observed 333 ± 40 protein spots in monocytes from patients and 312 ± 20 in controls; out of which 63 protein spots showed altered intensity in CAD patients. Thirteen spots showed fivefold increased and two protein spots showed fivefold decreased expression in CAD group as compared to control group, respectively. Two proteins showing decreased expression in monocytes from CAD patients were identified as: (i) glutathione transferase and (ii) heat shock protein 70 KDa. Proteins showing increased expression in CAD patients were identified as: (i) vimentin, (ii) mannose binding lectin receptor protein, and (iii) S100A8 calcium-binding protein. The results of our study offer identification of several proteins in monocytes which can provide new perspectives in role of monocytes in pathogenesis of atherosclerosis. PMID:21938407

Poduri, Aruna; Bahl, Ajay; Talwar, Kewal K; Khullar, Madhu

2012-01-01

186

Human CD68 promoter GFP transgenic mice allow analysis of monocyte to macrophage differentiation in vivo.  

PubMed

The recruitment of monocytes and their differentiation into macrophages at sites of inflammation are key events in determining the outcome of the inflammatory response and initiating the return to tissue homeostasis. To study monocyte trafficking and macrophage differentiation in vivo, we have generated a novel transgenic reporter mouse expressing a green fluorescent protein (GFP) under the control of the human CD68 promoter. CD68-GFP mice express high levels of GFP in both monocyte and embryo-derived tissue resident macrophages in adult animals. The human CD68 promoter drives GFP expression in all CD115(+) monocytes of adult blood, spleen, and bone marrow; we took advantage of this to directly compare the trafficking of bone marrow-derived CD68-GFP monocytes to that of CX3CR1(GFP) monocytes in vivo using a sterile zymosan peritonitis model. Unlike CX3CR1(GFP) monocytes, which downregulate GFP expression on differentiation into macrophages in this model, CD68-GFP monocytes retain high-level GFP expression for 72 hours after differentiation into macrophages, allowing continued cell tracking during resolution of inflammation. In summary, this novel CD68-GFP transgenic reporter mouse line represents a powerful resource for analyzing monocyte mobilization and monocyte trafficking as well as studying the fate of recruited monocytes in models of acute and chronic inflammation. PMID:25030063

Iqbal, Asif J; McNeill, Eileen; Kapellos, Theodore S; Regan-Komito, Daniel; Norman, Sophie; Burd, Sarah; Smart, Nicola; Machemer, Daniel E W; Stylianou, Elena; McShane, Helen; Channon, Keith M; Chawla, Ajay; Greaves, David R

2014-10-01

187

Isolation and intravenous injection of murine bone marrow derived monocytes.  

PubMed

As a subtype of leukocytes and progenitors of macrophages, monocytes are involved in many important processes of organisms and are often the subject of various fields in biomedical science. The method described below is a simple and effective way to isolate murine monocytes from heterogeneous bone marrow. Bone marrow from the femur and tibia of Balb/c mice is harvested by flushing with phosphate buffered saline (PBS). Cell suspension is supplemented with macrophage-colony stimulating factor (M-CSF) and cultured on ultra-low attachment surfaces to avoid adhesion-triggered differentiation of monocytes. The properties and differentiation of monocytes are characterized at various intervals. Fluorescence activated cell sorting (FACS), with markers like CD11b, CD115, and F4/80, is used for phenotyping. At the end of cultivation, the suspension consists of 45%± 12% monocytes. By removing adhesive macrophages, the purity can be raised up to 86%± 6%. After the isolation, monocytes can be utilized in various ways, and one of the most effective and common methods for in vivo delivery is intravenous tail vein injection. This technique of isolation and application is important for mouse model studies, especially in the fields of inflammation or immunology. Monocytes can also be used therapeutically in mouse disease models. PMID:25591000

Wagner, Martin; Koester, Helen; Deffge, Christian; Weinert, Soenke; Lauf, Johannes; Francke, Alexander; Lee, Jerry; Braun-Dullaeus, R C; Herold, Joerg

2014-01-01

188

Phenotypic and functional heterogeneity of bovine blood monocytes.  

PubMed

Murine and human peripheral blood monocytes are heterogeneous in size, granularity, nuclear morphology, phenotype and function. Whether and how bovine blood monocytes follow this pattern was analyzed in this study. Flow cytometrically, classical monocytes (cM) CD14?CD16?, intermediate monocytes (intM) CD14? CD16? and nonclassical monocytes (ncM) CD14? CD16? were identified, with cM being the predominant subset (89%). cM showed a significant lower expression of CD172a, intM expressed the highest level of MHC class II molecules, and ncM were low positive for CD163. Compared to cM and intM, ncM showed a significantly reduced phagocytosis capacity, a significantly reduced generation of reactive oxygen species, and reduced mRNA expression of CXCL8, CXCL1 and IL-1? after LPS stimulation. Based on IL-1? secretion after LPS/ATP stimulation, the inflammasome could be activated in cM and intM, but not in ncM. IFN? increased the expression of CD16 selectively on cM and induced a shift from cM into intM in vitro. In summary, bovine CD172a-positive mononuclear cells define three monocyte subsets with distinct phenotypic and functional differences. Bovine cM and intM share homologies with their human counterparts, whereas bovine ncM are not inflammatory monocytes. PMID:23967219

Hussen, Jamal; Düvel, Anna; Sandra, Olivier; Smith, David; Sheldon, Iain Martin; Zieger, Peter; Schuberth, Hans-Joachim

2013-01-01

189

Phenotypic and Functional Heterogeneity of Bovine Blood Monocytes  

PubMed Central

Murine and human peripheral blood monocytes are heterogeneous in size, granularity, nuclear morphology, phenotype and function. Whether and how bovine blood monocytes follow this pattern was analyzed in this study. Flow cytometrically, classical monocytes (cM) CD14+ CD16?, intermediate monocytes (intM) CD14+ CD16+ and nonclassical monocytes (ncM) CD14+ CD16+ were identified, with cM being the predominant subset (89%). cM showed a significant lower expression of CD172a, intM expressed the highest level of MHC class II molecules, and ncM were low positive for CD163. Compared to cM and intM, ncM showed a significantly reduced phagocytosis capacity, a significantly reduced generation of reactive oxygen species, and reduced mRNA expression of CXCL8, CXCL1 and IL-1? after LPS stimulation. Based on IL-1? secretion after LPS/ATP stimulation, the inflammasome could be activated in cM and intM, but not in ncM. IFN? increased the expression of CD16 selectively on cM and induced a shift from cM into intM in vitro. In summary, bovine CD172a-positive mononuclear cells define three monocyte subsets with distinct phenotypic and functional differences. Bovine cM and intM share homologies with their human counterparts, whereas bovine ncM are not inflammatory monocytes. PMID:23967219

Hussen, Jamal; Düvel, Anna; Sandra, Olivier; Smith, David; Sheldon, Iain Martin; Zieger, Peter; Schuberth, Hans-Joachim

2013-01-01

190

Monocyte transplantation for neural and cardiovascular ischemia repair  

PubMed Central

Abstract Neovascularization is an integral process of inflammatory reactions and subsequent repair cascades in tissue injury. Monocytes/macrophages play a key role in the inflammatory process including angiogenesis as well as the defence mechanisms by exerting microbicidal and immunomodulatory activity. Current studies have demonstrated that recruited monocytes/macrophages aid in regulating angiogenesis in ischemic tissue, tumours and chronic inflammation. In terms of neovascularization followed by tissue regeneration, monocytes/macrophages should be highly attractive for cell-based therapy compared to any other stem cells due to their considerable advantages: non-oncogenic, non-teratogenic, multiple secretary functions including pro-angiogenic and growth factors, straightforward cell harvesting procedure and non-existent ethical controversy. In addition to adult origins such as bone marrow or peripheral blood, umbilical cord blood (UCB) can be a potential source for autologous or allogeneic monocytes/macrophages. Especially, UCB monocytes should be considered as the first candidate owing to their feasibility, low immune rejection and multiple characteristic advantages such as their anti-inflammatory properties by virtue of their unique immune and inflammatory immaturity, and their pro-angiogenic ability. In this review, we present general characteristics and potential of monocytes/macrophages for cell-based therapy, especially focusing on neovascularization and UCB-derived monocytes. PMID:19754667

Sanberg, Paul R; Park, Dong-Hyuk; Kuzmin-Nichols, Nicole; Cruz, Eduardo; Hossne Jr, Nelson Americo; Buffolo, Enio; Willing, Alison E

2010-01-01

191

Lymphocyte homeostasis  

Microsoft Academic Search

B- and T-lymphocyte populations have an independent homeostatic regulation of resting (B and T) and activated (B) or memory (T) cell compartments. This organization may provide an efficient mechanism to ensure simultaneously a first natural barrier of protection against common pathogens, the maintenance of immunological T-cell memory and a reservoir of repertoire diversity capable of dealing with new antigenic challenges.

Corinne Tanchot; Manuela M. Rosado; Fabien Agenes; Antonio A. Freitas; Benedita Rocha

1997-01-01

192

(CD14) on monocytes: role of complement activation  

E-print Network

Background. The CD 14 molecule is a high-affinity receptor for the complex formed by lipopolysaccharide (LPS) and LPS-binding protein. Methods. We examined by flow cytometry the effect of in vitro and in vivo haemodialysis on cuprophane membrane and recombinant C5a on the expression of CD14 molecules at the surface of monocytes. Monocyte CD 14 expression was also studied during in vitro and in vivo haemodialysis on polyacrylonitrile AN69 membrane. Results. In vitro haemodialysis of whole blood from healthy volunteers on cuprophane membrane resulted within 30 min in upregulation of monocyte CD 14 expression. The reuse of the cuprophane membrane

A. Marchant; C. Tielemans; C. Husson; K. Gastaldello; T. Schurmans; D. De Groote; J. Duchow; J. L. Vanherweghem; M. Goldman

193

Primary monocytes regulate endothelial cell survival through secretion of Angiopoietin-1 and activation of endothelial Tie2  

E-print Network

Objective—Monocyte recruitment and interaction with the endothelium is imperative to vascular recovery. Tie2 plays a key role in endothelial health and vascular remodeling. We studied monocyte-mediated Tie2/angiopoietin ...

Schubert, Shai Y.

194

Comparative analysis of canine monocyte- and bone-marrow-derived dendritic cells  

PubMed Central

Dendritic cells (DC) represent a heterogeneous cell family of major importance for innate immune responses against pathogens and antigen presentation during infection, cancer, allergy and autoimmunity. The aim of the present study was to characterize canine DC generated in vitro with respect to their phenotype, responsiveness to toll-like receptor (TLR) ligands and T-cell stimulatory capacity. DC were derived from monocytes (MoDC) and from bone marrow hematopoietic cells cultured with either Flt3-ligand (FL-BMDC) or with GM-CSF (GM-BMDC). All three methods generated cells with typical DC morphology that expressed CD1c, CD11c and CD14, similar to macrophages. However, CD40 was only found on DC, CD206 on M? and BMDC, but not on monocytes and MoDC. CD1c was not found on monocytes but on all in vitro differentiated cells. FL-BMDC and GM-BMDC were partially positive for CD4 and CD8. CD45RA was expressed on a subset of FL-BMDC but not on MoDC and GM-BMDC. MoDC and FL-DC responded well to TLR ligands including poly-IC (TLR2), Pam3Cys (TLR3), LPS (TLR4) and imiquimod (TLR7) by up-regulating MHC II and CD86. The generated DC and M? showed a stimulatory capacity for lymphocytes, which increased upon maturation with LPS. Taken together, our results are the basis for further characterization of canine DC subsets with respect to their role in inflammation and immune responses. PMID:20167201

Ricklin Gutzwiller, Meret Elisabeth; Moulin, Hervé Raphaël; Zurbriggen, Andreas; Roosje, Petra; Summerfield, Artur

2010-01-01

195

Human peripheral blood monocytes versus THP-1 monocytes for in vitro biocompatibility testing of dental material components.  

PubMed

Monocytes play a central role in the response of tissues to biomaterials. Monocytic cell lines such as the THP-1 cell line have been used extensively as models for primary monocytes (directly from blood) in biocompatibility research. However, little information exists about the appropriateness of these cell lines as models. Thus, the current study compared the biological response of both primary peripheral blood monocytes (PBMs) and the THP-1 cell line to four common components of dental materials known to be released into the oral environment: nickel ions, 2-hydroxyethyl methacrylate (HEMA), triethylene glycol dimethacrylate (TEGDMA), and 2,2-bis[4(2-hydroxy-3-methacryloloxy)-phenyl]propane (Bis-GMA). Comparisons were made by constructing dose-response curves for each type of monocyte and the four components. The 50% cytotoxicity values (TC50 values) were then statistically compared. In addition, the response of the monocytes to the materials with and without lipopolysaccharide (LPS) stimulation were assessed by measuring TNF-alpha secretion from the monocytes. The results showed that the PBMs were 5-10 times less sensitive than the THP-1 monocytes to these dental components, but that both cell lines ranked the components identically. TNF-alpha secretion from both types of monocytes often showed similar trends, although some inconsistent results were noted. The current study supports the use of THP-1s as a model for ranking the cytotoxicity of components of dental biomaterials. Furthermore, the secretory activity of PBMs appears to be generally well represented by the THP-1s. However, sufficient differences between these cell types exist to recommend confirmation of any critical results obtained with THP-1s using PBMs. PMID:12028485

Heil, T L; Volkmann, K R; Wataha, J C; Lockwood, P E

2002-05-01

196

Influence of GSM signals on human peripheral lymphocytes: study of genotoxicity.  

PubMed

Exposure to radiofrequency (RF) electromagnetic fields (EMF) is continuously increasing worldwide. Yet, conflicting results of a possible genotoxic effect of RF EMF continue to be discussed. In the present study, a possible genotoxic effect of RF EMF (GSM, 1,800 MHz) in human lymphocytes was investigated by a collaboration of six independent institutes (institutes a, b, c, d, e, h). Peripheral blood of 20 healthy, nonsmoking volunteers of two age groups (10 volunteers 16-20 years old and 10 volunteers 50-65 years old) was taken, stimulated and intermittently exposed to three specific absorption rates (SARs) of RF EMF (0.2 W/kg, 2 W/kg, 10 W/kg) and sham for 28 h (institute a). The exposures were performed in a setup with strictly controlled conditions of temperature and dose, and randomly and automatically determined waveguide SARs, which were designed and periodically maintained by ITIS (institute h). Four genotoxicity tests with different end points were conducted (institute a): chromosome aberration test (five types of structural aberrations), micronucleus test, sister chromatid exchange test and the alkaline comet assay (Olive tail moment and % DNA). To demonstrate the validity of the study, positive controls were implemented. The genotoxicity end points were evaluated independently by three laboratories blind to SAR information (institute c = laboratory 1; institute d = laboratory 2; institute e = laboratory 3). Statistical analysis was carried out by institute b. Methods of primary statistical analysis and rules to adjust for multiple testing were specified in a statistical analysis plan based on a data review before unblinding. A linear trend test based on a linear mixed model was used for outcomes of comet assay and exact permutation test for linear trend for all other outcomes. It was ascertained that only outcomes with a significant SAR trend found by at least two of three analyzing laboratories indicated a substantiated suspicion of an exposure effect. On the basis of these specifications, none of the nine end points tested for SAR trend showed a significant and reproducible exposure effect. Highly significant differences between sham exposures and positive controls were detected by each analyzing laboratory, thus validating the study. In conclusion, the results show no evidence of a genotoxic effect induced by RF EMF (GSM, 1,800 MHz). PMID:23316708

Waldmann, Petra; Bohnenberger, Susanne; Greinert, Rüdiger; Hermann-Then, Beate; Heselich, Anja; Klug, Stefanie J; Koenig, Jochem; Kuhr, Kathrin; Kuster, Niels; Merker, Mandy; Murbach, Manuel; Pollet, Dieter; Schadenboeck, Walter; Scheidemann-Wesp, Ulrike; Schwab, Britt; Volkmer, Beate; Weyer, Veronika; Blettner, Maria

2013-02-01

197

Ganoderma lucidum polysaccharides can induce human monocytic leukemia cells into dendritic cells with immuno-stimulatory function  

Microsoft Academic Search

BACKGROUND: Previous studies demonstrated Ganoderma lucidum polysaccharides (GL-PS), a form of bioactive ?-glucan can stimulate the maturation of monocyte-derived dendritic cells (DC). The question of how leukemic cells especially in monocytic lineage respond to GL-PS stimuli remains unclear. RESULTS: In this study, we used in vitro culture model with leukemic monocytic cell-lines THP-1 and U937 as monocytic effectors cells for

Wing Keung Chan; Christopher Ching Hang Cheung; Helen Ka Wai Law; Yu Lung Lau; Godfrey Chi Fung Chan

2008-01-01

198

Experimental study on the enhancement of murine splenic lymphocyte proliferation by Lycium Barbarum glycopeptide  

Microsoft Academic Search

Summary  In order to investigate the immunoactivity ofLycium Barbarum glycopeptide (LBG), the routinely prepared murine splenic lymphocyte suspension was separately added into the samples with\\u000a different concentrations (500, 100, 10, 1 ?g\\/ml) of LBG as LBG groups. Blank control group in the absence ofLycium Barbarum glycopeptide or ConA and positive control group in the presence of 0.5 ml Cona but in

Du Guang; Liu Lu; Fang Jianguo

2004-01-01

199

A Biomarker Panel (Bioscore) Incorporating Monocytic Surface and Soluble TREM-1 Has High Discriminative Value for Ventilator-Associated Pneumonia: A Prospective Observational Study  

PubMed Central

Introduction Ventilator-associated pneumonia (VAP) increases mortality in critical illness. However, clinical diagnostic uncertainty persists. We hypothesised that measuring cell-surface and soluble inflammatory markers, incorporating Triggering Receptor Expressed by Myeloid cells (TREM)-1, would improve diagnostic accuracy. Methods A single centre prospective observational study, set in a University Hospital medical-surgical intensive Care unit, recruited 91 patients into 3 groups: 27 patients with VAP, 33 ventilated controls without evidence of pulmonary sepsis (non-VAP), and 31 non-ventilated controls (NVC), without clinical infection, attending for bronchoscopy. Paired samples of Bronchiolo-alveolar lavage fluid (BALF) and blood from each subject were analysed for putative biomarkers of infection: Cellular (TREM-1, CD11b and CD62L) and soluble (IL-1?, IL-6, IL-8, sTREM-1, Procalcitonin). Expression of cellular markers on monocytes and neutrophils were measured by flow cytometry. Soluble inflammatory markers were determined by ELISA. A biomarker panel (‘Bioscore’), was constructed, tested and validated, using Fisher’s discriminant function analysis, to assess its value in distinguishing VAP from non VAP. Results The expression of TREM-1 on monocytes (mTREM-1) and neutrophils (nTREM-1) and concentrations of IL-1?, IL-8, and sTREM-1 in BALF were significantly higher in VAP compared with non-VAP and NVC (p<0.001). The BALF/blood mTREM-1 was significantly higher in VAP patients compared to non-VAP and NVC (0.8 v 0.4 v 0.3 p<0.001). A seven marker Bioscore (BALF/blood ratio mTREM-1 and mCD11b, BALF sTREM-1, IL-8 and IL-1?, and serum CRP and IL-6) correctly identified 88.9% of VAP cases and 100% of non-VAP cases. Conclusion A 7-marker bioscore, incorporating cellular and soluble TREM-1, accurately discriminates VAP from non-pulmonary infection. PMID:25289689

Grover, Vimal; Pantelidis, Panagiotis; Soni, Neil; Takata, Masao; Shah, Pallav L.; Wells, Athol U.; Henderson, Don C.; Kelleher, Peter; Singh, Suveer

2014-01-01

200

SLC11A1 is expressed by innate lymphocytes and augments their activation1  

PubMed Central

SLC11A1 is a divalent ion transporter formerly known as the natural resistance-associated macrophage protein (NRAMP1) and the Bcg/Lsh/Ity locus. SLC11A1 was thought to be exclusively expressed in monocyte/macrophages and to have roles in phagosome maturation and cell activation. We characterized the expression of SLC11A1 in the majority of human and bovine ?? T cells and NK cells, and in human CD3+CD45RO+ T cells. Consistent with a role for iron-dependent inhibition of protein tyrosine phosphatases, SLC11A1+ lymphocytes were moreprone to activation and retained tyrosine phosphorylation. Transfection of SLC11A1 into a human ?? T cell-like line rendered the cells more prone to activation. Non-adherent splenocytes from wild type mice expressed significantly greater IFN-? compared to cells from Sv/129 (SLC11A1?/?) mice. Our data suggest that SLC11A1 has a heretofore unknown role in activation of a large subset of innate lymphocytes that are critical sources of IFN-?. SLC11A1+ animals have enhanced innate IFN-? expression in response to Salmonella infection compared to SLC11A1?mice, which includes commonly used inbred laboratory mice. Expression of SLC11A1 in innate lymphocytes and its role in augmenting their activation may account for inconsistencies in studies of innate lymphocytes in different animal models. PMID:23509347

Hedges, Jodi F.; Kimmel, Emily; Snyder, Deann T.; Jerome, Maria; Jutila, Mark A.

2013-01-01

201

Monocytes in sterile inflammation: recruitment and functional consequences  

PubMed Central

Monocytes play an important role in initiating innate immune responses. Three subsets of these cells have been defined in mice including classical, nonclassical and intermediate monocytes. Each of these cell types has been extensively studied for their role in infectious diseases. However, their role in sterile injury as occurs during ischemia-reperfusion injury, atherosclerosis, and trauma has only recently been the focus of investigations. Here we review mechanisms of monocyte recruitment to sites of sterile injury, their modes of action, and their effect on disease outcome in murine models with some references to human studies. Therapeutic strategies to target these cells must be developed with caution since each monocyte subset is capable of mediating either anti- or pro-inflammatory effects depending on the setting. PMID:24310705

Spahn, Jessica H.; Kreisel, Daniel

2015-01-01

202

CD69 is independently prognostic in chronic lymphocytic leukemia: a comprehensive clinical and biological profiling study  

PubMed Central

Background CD69 is expressed in several hemopoietic cells and is an early activation marker in chronic lymphocytic leukemia. Chronic lymphocytic leukemia is a clinically heterogeneous disease which needs novel prognostic parameters which can be easily and efficiently managed. Design and Methods We investigated CD69 by flow cytometry in a series of 417 patients affected by chronic lymphocytic leukemia and compared this to other biological and clinical prognosticators. Results CD69 was associated with Rai stages (P=0.00002), ?2-microglobulin (P=0.0005) and soluble CD23 (P<0.0001). CD69 and ZAP-70 (P=0.018) or CD38 (P=0.00015) or immunoglobulin variable heavy chain gene mutations (P=0.0005) were also significantly correlated. Clinically, CD69 positive chronic lymphocytic leukemias received chemotherapy more frequently (74%; P<0.0001), and presented a shorter duration of response after fludarabine plus rituximab (P=0.010) as well as shorter progression free survival and overall survival (P<0.0001). CD69 demonstrated true additive prognostic properties, since the CD69+ plus ZAP-70+ or CD38+ or immunoglobulin variable heavy chain gene unmutated patients had the worst progression free survival and overall survival (P<0.0001). Interestingly, low CD69 expression was necessary to correctly prognosticate the longer progression free survival of patients with a low tumor burden of ?2-microglobulin (P=0.002), of soluble CD23 (P=0.020), or of Rai stages 0-I (P=0.005). CD69 was confirmed to be an independent prognostic factor in multivariate analysis of progression free survival (P=0.017) and overall survival (P=0.039). Conclusions Our data indicate that CD69 is significantly correlated with poor clinical and biological prognostic factors and is confirmed to be an independent disease prognosticator. This supports its introduction in a routine laboratory assessment and, possibly, in a prognostic scoring system for chronic lymphocytic leukemia, after an adequate standardization process. PMID:21993667

Del Poeta, Giovanni; Del Principe, Maria Ilaria; Zucchetto, Antonella; Luciano, Fabrizio; Buccisano, Francesco; Maria Rossi, Francesca; Bruno, Antonio; Biagi, Annalisa; Bulian, Pietro; Maurillo, Luca; Neri, Benedetta; Bomben, Riccardo; Simotti, Cristina; Coletta, Angela Maria; Dal Bo, Michele; de Fabritiis, Paolo; Venditti, Adriano; Gattei, Valter; Amadori, Sergio

2012-01-01

203

Serial study of the effect of radiotherapy on semen parameters, hamster egg penetration rates, and lymphocyte chromosome abnormalities  

SciTech Connect

This study was designed to assess the long-term effects of radiotherapy (RT) on male fertility and the induction of lymphocyte and sperm chromosome abnormalities. This preliminary report provides information on 11 cancer patients (mainly seminomas) treated by RT (testicular dose, 44 to 499 rads). All 11 men were studied pre-RT and at intervals post-RT. The pre-RT semen profile varied considerably, but, in general, the profile was poor with a mean sperm concentration of 19.4 x 10/sup 6/ ml and a mean hamster egg penetration rate of 5%. One month after RT, the sperm concentration decreased and hamster egg penetration was 0% in all men. At 3 and 12 months post-RT, all but two patients were azoospermic. By 24 months post-RT, 9 of 11 patients had regained sperm production and 5 had sperm capable of hamster egg penetration. The three men who have been studied 36 months post-RT had a mean sperm concentration of 45.3 x 10/sup 6/ ml, and all had positive hamster egg penetration tests, although two of the three men had very low penetration rates (2% and 4%). Lymphocyte chromosome analysis demonstrated a striking frequency of chromosome abnormalities post-RT which decreased with time (pre-RT, 0%; 1 month, 42.4%; 3 months, 24.7%; 12 months, 13.8%; 24 months, 11.2%; and 36 months, 10.0%). Thus, it appears that sperm production starts to recover 2 to 3 years after RT when the frequency of lymphocyte chromosome abnormalities has decreased, but the sperm may not be fully functional at this time, as evidenced by poor rates of hamster egg penetration. Future studies of sperm chromosome analysis in these men will determine whether this impairment of the sperm is associated with meiotic chromosome abnormalities.

Martin, R.H.; Barnes, M.; Arthur, K.; Ringrose, T.; Douglas, G.

1984-02-01

204

Decreased deformability of lymphocytes in chronic lymphocytic leukemia  

NASA Astrophysics Data System (ADS)

This paper reports the first study of stiffness/deformability changes of lymphocytes in chronic lymphocytic leukemia (CLL) patients, demonstrating that at the single cell level, leukemic metastasis progresses are accompanied by biophysical property alterations. A microfluidic device was utilized to electrically measure cell volume and transit time of single lymphocytes from healthy and CLL patients. The results from testing thousands of cells reveal that lymphocytes from CLL patients have higher stiffness (i.e., lower deformability), as compared to lymphocytes in healthy samples, which was also confirmed by AFM indentation tests. This observation is in sharp contrast to the known knowledge on other types of metastatic cells (e.g., breast and lung cancer cells) whose stiffness becomes lower as metastasis progresses.

Zheng, Yi; Wen, Jun; Nguyen, John; Cachia, Mark A.; Wang, Chen; Sun, Yu

2015-01-01

205

Decreased deformability of lymphocytes in chronic lymphocytic leukemia  

PubMed Central

This paper reports the first study of stiffness/deformability changes of lymphocytes in chronic lymphocytic leukemia (CLL) patients, demonstrating that at the single cell level, leukemic metastasis progresses are accompanied by biophysical property alterations. A microfluidic device was utilized to electrically measure cell volume and transit time of single lymphocytes from healthy and CLL patients. The results from testing thousands of cells reveal that lymphocytes from CLL patients have higher stiffness (i.e., lower deformability), as compared to lymphocytes in healthy samples, which was also confirmed by AFM indentation tests. This observation is in sharp contrast to the known knowledge on other types of metastatic cells (e.g., breast and lung cancer cells) whose stiffness becomes lower as metastasis progresses. PMID:25573422

Zheng, Yi; Wen, Jun; Nguyen, John; Cachia, Mark A.; Wang, Chen; Sun, Yu

2015-01-01

206

Activity of circulating monocytes in patients with chronic glomerulonephritis  

Microsoft Academic Search

Monocytes of 95 patients with chronic glomerulonephritis (ch.g.) testedin vitro demonstrated characteristics of activation in proliferative, and of functional suppression in mesangiocapillary glomerulopathy. Fc and C3 receptor function studied by rosette assay and metabolic potential measured by the NBT reduction test constituted result patterns. Receptor tests were supplemented with their counterparts after monocyte triggering with heat-inactivated sera and in case

Z. Hruby; W. Kope?; Z. Szewczyk

1985-01-01

207

Enhanced calcium responses to serotonin receptor stimulation in T-lymphocytes from schizophrenic patients - A pilot study.  

PubMed

Even if more extensively investigated in affective disorders, the serotonergic system is likely to be also implicated in modulating the pathogenesis of schizophrenia, where it closely interacts with the dopaminergic and glutamatergic system. To substantiate this notion, we studied the intensity and dynamics of cellular Ca(2+) responses to serotonin (5-hydoxytryptamine, 5-HT) in peripheral lymphocytes taken from currently non-psychotic schizophrenic patients. To this aim, peripheral lymphocytes were freshly obtained from healthy controls and a naturalistic collective of patients with schizophrenia in remission. Intracellular Ca(2+) responses were recorded in real-time by ratiometric fluorometry after 5-HT or phythaemagglutinin (PHA) stimulation, which served as an internal reference for Ca(2+) responsivity to non-specific stimulation. The intracellular Ca(2+) peak early after applying the 5-HT trigger was significantly elevated in schizophrenic patients. No significant differences of Ca(2+) peak levels were seen in response to stimulation with the mitogenic agent PHA, although responses to 5-HT and PHA were positively correlated in individual patients or controls. In conclusion, the serotonergic response patterns in peripheral lymphocytes from schizophrenic patients seem to be elevated, if employing sensitive tools like determination of intracellular Ca(2+) responses. Our observations suggest that the participation of serotonergic neurotransmitter system in the pathogenesis of schizophrenia may deserve more interest, even if it should only act as a modulator on the main pathology in the dopaminergic and glutamatergic systems. We hope that this pilot study will prompt further studies with larger patient collectives to revisit this question. PMID:25576705

Genius, J; Schellenberg, A; Tchana-Duope, L; Hartmann, N; Giegling, I; Hartmann, A; Benninghoff, J; Rujescu, D

2015-03-01

208

High Affinity IgE Receptor-Mediated Prostaglandin E2 Production by Monocytes in Atopic Dermatitis  

Microsoft Academic Search

High affinity IgE receptor (Fc ε R I) expression on monocytes and its upregulation on monocytes from patients with atopic dermatitis (AD) have been recently reported. In this study, we investigated whether prostaglandin E2 (PGE2) release from AD monocytes was Fc ε R I-dependent or not. The monocytes were stimulated with anti-Fc ε RI monoclonal antibody (mAb) and anti-Fc ε

M. Takenaka; Y. Tanaka; S. Anan; H. Yoshida; C. Ra

1995-01-01

209

The role of monocyte phenotype switching in peri-procedural myocardial injury and its involvement in statin therapy  

PubMed Central

Peri-procedural myocardial injury, which is associated with worse long-term clinical outcome, is a common complication related to inflammatory pathogenetic mechanisms. Monocytes and macrophages play key roles in the initiation and progression of atherosclerosis. Recent studies have demonstrated that monocytes in human peripheral blood are heterogeneous, including CD14+CD16? monocytes and CD14+CD16+ monocytes. Several lines of evidence suggested that CD14+CD16+ monocytes might contribute to the accelerated atherosclerosis. In view of the heightened appreciation of the heterogeneity of circulating monocytes, we hypothesized that an up-shifting subset of CD14+CD16+ monocytes might be induced by percutaneous coronary intervention (PCI), which subsequently leads to peri-procedural myocardial injury. Moreover, statins loading before PCI could exert anti-inflammatory effects partly by modulating monocyte phenotype and thus prevent peri-procedural myocardial injury. PMID:24241246

Yang, Yang; Cui, Yi; Peng, Dao-Quan

2013-01-01

210

Modification of surface marker expression on CD14 monocytes of allergic patients after lysis or Ficoll purification  

Microsoft Academic Search

It has been observed that peripheral blood monocytes are often in a primed or activated state in inflammatory diseases such as asthma. However, the majority of these studies have been performed using cells which have been purified by density gradient centrifugation on Percoll or Ficoll-Hypaque. Using cytofluorimetry, we compared the expression of monocyte surface markers of monocytes from untreated blood

F Souques; Ch Duperray; J Pène; J Bousquet; B Arnoux

1997-01-01

211

Prediction of clinical toxicity in localized cervical carcinoma by radio-induced apoptosis study in peripheral blood lymphocytes (PBLs)  

PubMed Central

Background Cervical cancer is treated mainly by surgery and radiotherapy. Toxicity due to radiation is a limiting factor for treatment success. Determination of lymphocyte radiosensitivity by radio-induced apoptosis arises as a possible method for predictive test development. The aim of this study was to analyze radio-induced apoptosis of peripheral blood lymphocytes. Methods Ninety four consecutive patients suffering from cervical carcinoma, diagnosed and treated in our institution, and four healthy controls were included in the study. Toxicity was evaluated using the Lent-Soma scale. Peripheral blood lymphocytes were isolated and irradiated at 0, 1, 2 and 8 Gy during 24, 48 and 72 hours. Apoptosis was measured by flow cytometry using annexin V/propidium iodide to determine early and late apoptosis. Lymphocytes were marked with CD45 APC-conjugated monoclonal antibody. Results Radiation-induced apoptosis (RIA) increased with radiation dose and time of incubation. Data strongly fitted to a semi logarithmic model as follows: RIA = ?ln(Gy) + ?. This mathematical model was defined by two constants: ?, is the origin of the curve in the Y axis and determines the percentage of spontaneous cell death and ?, is the slope of the curve and determines the percentage of cell death induced at a determined radiation dose (? = ?RIA/?ln(Gy)). Higher ? values (increased rate of RIA at given radiation doses) were observed in patients with low sexual toxicity (Exp(B) = 0.83, C.I. 95% (0.73-0.95), p = 0.007; Exp(B) = 0.88, C.I. 95% (0.82-0.94), p = 0.001; Exp(B) = 0.93, C.I. 95% (0.88-0.99), p = 0.026 for 24, 48 and 72 hours respectively). This relation was also found with rectal (Exp(B) = 0.89, C.I. 95% (0.81-0.98), p = 0.026; Exp(B) = 0.95, C.I. 95% (0.91-0.98), p = 0.013 for 48 and 72 hours respectively) and urinary (Exp(B) = 0.83, C.I. 95% (0.71-0.97), p = 0.021 for 24 hours) toxicity. Conclusion Radiation induced apoptosis at different time points and radiation doses fitted to a semi logarithmic model defined by a mathematical equation that gives an individual value of radiosensitivity and could predict late toxicity due to radiotherapy. Other prospective studies with higher number of patients are needed to validate these results. PMID:19941649

2009-01-01

212

Monocyte/macrophage and protein interactions with non-fouling plasma polymerized tetraglyme and chemically modified polystyrene surfaces: In vitro and in vivo studies  

NASA Astrophysics Data System (ADS)

Biomaterials become encapsulated by fibrous tissues after implantation in soft tissues. Monocytes and macrophages are believed to play important roles in this response. The hypothesis tested in this dissertation is that material surface chemistry determines the amount of adsorbed proteins, which mediate monocyte adhesion, activation, and the foreign body response. On chemically modified polystyrene surfaces, monocyte adhesion in vitro was promoted by preadsorbed fibrinogen, fibronectin, and IgG, and increased with increasing amount of adsorbed fibrinogen. Adsorbed proteins and material surface chemistry mediated monocyte activation. TNFalpha release, procoagulant activity, and multinucleated foreign body giant cell (FBGC) formation was at least two-fold higher on IgG than other protein adsorbed surfaces. Adsorbed IgG and fibrinogen triggered monocyte intracellular calcium changes. FBGC formation was the highest on the hydrophobic polystyrene surface. Materials that greatly reduce non-specific protein adsorption may reduce the foreign body response to implanted materials. Radio-frequency plasma polymerized tetraglyme (CH3O(CH2CH2O)4CH 3) surfaces contained PEO-like chemical species and reduced fibrinogen adsorption to less than 10 ng/cm2. Monocyte adhesion to tetraglyme in vitro was also greatly reduced. Monocyte adhesion correlated linearly to the amount of adsorbed fibrinogen on a series of tetraglyme surfaces deposited at different plasma powers. Multivariate analysis using partial least squares regression identified the key surface spectra variables from electron spectroscopy for chemical analysis (ESCA) and time of flight secondary ion mass spectrometry (ToF-SIMS) that contributed to the non-fouling properties of tetraglyme. However, leukocyte adhesion to surfaces implanted subcutaneously in mice for 1 or 28 days did not correlate with protein adsorption and was higher on tetraglyme than the FEP control. Fibrous encapsulation to tetraglyme implanted for 28 days was not reduced. Neutrophil adhesion to tetraglyme from whole blood or in plasma was higher than FEP, but was lower than FEP from neutrophils in serum. Loosely bound proteins such as fibrinogen may contribute to leukocyte adhesion to tetraglyme. Overall, protein adsorption and monocyte adhesion to tetraglyme in vitro did not correlate with tissue responses in vivo. Further understanding of the mechanism of fibrous encapsulation is necessary for developing biocompatible materials that can inhibit the foreign body response and promote normal wound healing.

Shen, Mingchao

2001-07-01

213

Distinct immunologic effects of different intravenous iron preparations on monocytes  

PubMed Central

Background Iron deficiency contributes to anaemia in patients with chronic kidney disease. I.v. iron is therefore widely used for anaemia treatment, although it may induce oxidative stress and activate monocytes. Different i.v. iron preparations are available, but interestingly their substance-specific immunologic effects are poorly studied. Methods We analysed the effect of iron sucrose, ferric carboxymaltose, iron isomaltoside 1000, low-molecular-weight iron dextran and ferumoxytol on classical, intermediate and nonclassical monocyte biology. We therefore stimulated in vitro mature monocytes and haematopoietic CD34+ stem cells during their differentiation into monocytes with different concentrations (0.133, 0.266, 0.533 mg/mL) of i.v. iron preparations. Alterations of monocyte subset distribution, expression of surface markers (CD86, CCR5, CX3CR1), as well as production of pro-inflammatory cytokines (TNF-?, IL-1?) and reactive oxygen species were measured using flow cytometry. Additionally, we analysed phagocytosis and antigen presentation capacity. Results We found specific immunologic effects after stimulation with iron sucrose which were not induced by the other iron preparations. Iron sucrose activated monocyte subsets leading to significantly increased CD86 expression. Simultaneously CD16 and CX3CR1 expression and monocytic phagocytosis capacity were decreased. Additionally, differentiation of monocytes from haematopoietic CD34+ stem cells was almost completely abolished after stimulation with iron sucrose. Conclusions Our findings demonstrate that specific immunologic effects of distinct i.v. iron preparations exist. The clinical relevance of these findings requires further investigation. PMID:24523357

Fell, Lisa H.; Zawada, Adam M.; Rogacev, Kyrill S.; Seiler, Sarah; Fliser, Danilo; Heine, Gunnar H.

2014-01-01

214

Oxidized Low Density Lipoprotein Induces Differentiation and Adhesion of Human Monocytes and the Monocytic Cell Line U937  

NASA Astrophysics Data System (ADS)

Hypercholesterolemia is a major risk factor for development of atherosclerosis. In experimental animals fed a high-cholesterol diet, monocytes adhere to the arterial endothelium and penetrate into the intima where they differentiate into macrophages and ingest lipids thus giving rise to fatty streaks, the earliest type of atherosclerotic plaque. Macrophages express few receptors for normal low density lipo-protein (LDL) but can take up oxidized LDL by way of a scavenger receptor. The present study was designed to investigate the possible role of oxidized LDL in recruitment of resident intimal macrophages. We found that oxidized LDL induced enhanced expression of major histocompatibility complex class II molecules on human monocytes and U937 cells, a well-established system for studies of monocytic differentiation. Oxidized LDL also induced enhanced expression of the surface antigen LEuM3 but caused decreased expression of CD4 antigen, a pattern compatible with expression of a more differentiated macrophage-like phenotype. Oxidized LDL also initiated aggregation of monocytes and U937 cells and stimulated adhesion of U937 cells to cultured endothelial cells. The results indicate that oxidized LDL may contribute to development of atherosclerosis by inducing adhesion of monocytes to the arterial intima and by stimulating intimal monocytes to differentiate into resident macrophages.

Frostegard, Johan; Nilsson, Jan; Haegerstrand, Anders; Hamsten, Anders; Wigzell, Hans; Gidlund, Magnus

1990-02-01

215

Critical role of monocyte chemoattractant protein-1 receptor CCR2 on monocytes in hypertension-induced vascular inflammation and remodeling.  

PubMed

Activated monocytes are present in the arterial walls of hypertensive patients and animals. Monocyte chemoattractant protein-1 (MCP-1), which controls monocyte function through its receptor (CCR2), is implicated in hypertensive inflammatory changes in the arterial wall. The role of CCR2 expression on monocytes in hypertension-induced vascular remodeling, however, has not been addressed. We hypothesized that CCR2 on monocytes is critical in hypertension-induced vascular inflammation and remodeling. Hypertension was induced by infusion of angiotensin II (Ang II) into wild-type mice, CCR2-deficient (CCR2-/-) mice, and bone marrow-transferred mice with a leukocyte-selective CCR2 deficiency (BMT-CCR2-/-). In wild-type mice, Ang II increased CCR2 intensity in circulating monocytes, which was prevented by an Ang II type-1 (AT1) receptor blocker or blunted in AT1 receptor-deficient mice. Enhanced CCR2 intensity on monocytes was observed in hypertensive patients and rats, and was reduced by treatment with the Ang II receptor blocker, supporting the clinical relevance of the observation in mice. In CCR2-/- and BMT-CCR2-/- mice, Ang II-induced vascular inflammation and vascular remodeling (aortic wall thickening and fibrosis) were blunted as compared with control mice. In contrast, Ang II-induced left ventricular hypertrophy developed in CCR2-/- and BMT-CCR2-/- mice. The present study suggests that CCR2 expression in monocytes has a critical role in vascular inflammation and remodeling in Ang II-induced hypertension, and possibly in other forms of hypertension. PMID:15059935

Ishibashi, Minako; Hiasa, Ken-ichi; Zhao, Qingwei; Inoue, Shujiro; Ohtani, Kisho; Kitamoto, Shiro; Tsuchihashi, Miyuki; Sugaya, Takeshi; Charo, Israel F; Kura, Shinobu; Tsuzuki, Teruhisa; Ishibashi, Tatsuro; Takeshita, Akira; Egashira, Kensuke

2004-05-14

216

Defective interleukin-1 production in a familial monocyte disorder with a combined abnormality of mobility and phagocytosis-killing.  

PubMed

Monocytes in a familial monocyte disorder, a recently recognized primary immunodeficiency syndrome, with impaired phagocytic functions were studied for their ability to produce interleukin 1 (IL-1) as well as the surface property. Monocytes from two children (siblings) with the disorder possessed CD11b, CD13, CD14, CD33, Ia and LFA-1/Mac-1/p150,95 beta subunit antigens as determined by flow cytometry. Electron microscopic cytochemistry showed that the monocytes had surface glycoproteins reactive with four representative lectins. The IL-1 production by monocytes was assayed in the two patients and compared with that in six children with primary immunodeficiency syndromes and some monocyte abnormalities; three had congenital neutropenia, two had hyper-IgE syndrome, and one had defective monocyte chemotaxis. Monocyte culture supernatants were prepared with stimulation by lipopolysaccharide or silica, and their IL-1 activity was measured by the mouse thymocyte-proliferation assay. The patients' monocytes were defective in IL-1 production: the values were less than 1.0% of the control monocyte values (n = 12) and were in contrast with those of congenital neutropenia monocytes of 186.2% to 204.3%. These results demonstrate a familial monocyte disorder which is characteristic among the immunodeficiency syndromes with regard to the defective IL-1 production and the impaired phagocytic functions. PMID:3264774

Komiyama, A; Ichikawa, M; Kanda, H; Aoyama, K; Yasui, K; Yamazaki, M; Kawai, H; Miyagawa, Y; Akabane, T

1988-09-01

217

Inflammatory status of transmigrating primary rat monocytes in a novel perfusion model simulating blood flow  

PubMed Central

It remains unclear whether monocyte infiltration plays a protective or detrimental role in neurodegenerative disease. The present study characterizes the inflammatory status of primary monocytes in a novel in vitro perfusion model. Monocytes under perfusion do not undergo elevated cell death. However, perfusion does lead to altered morphology, which can be counteracted by anti-inflammatory drugs. Functional studies indicate that cytokine levels are significantly reduced in perfusion compared to stationary conditions and enhanced with brain slices or capillary endothelial cells. Understanding monocyte properties could lead to refined treatment and new ways to interfere with inflammation in diseased brains. PMID:23499257

Hohsfield, Lindsay A.; Ammann, Christoph G.; Humpel, Christian

2013-01-01

218

Upregulation of programmed death-1 on T cells and programmed death ligand-1 on monocytes in septic shock patients  

PubMed Central

Introduction Studies on the role of programmed death-1(PD-1) and its main ligand (PD-L1) during experimental models of sepsis have shown that the PD-1/PD-L1 pathway plays a pathologic role in altering microbial clearance, the innate inflammatory response and accelerated apoptosis in sepsis. However, the expression of PD-1 and PD-L1 and their role during the development of immune suppression in septic patients have not been elucidated. The present study was designed to determine whether the expression of PD-1 and PD-L1 is upregulated in septic shock patients and to explore the role of this pathway in sepsis-induced immunosuppression. Methods Nineteen septic shock patients and 22 sex-matched and age-matched healthy controls were prospectively enrolled. Apoptosis in lymphocyte subpopulations and PD-1/PD-L1 expression on peripheral T cells, B cells and monocytes were measured using flow cytometry. Apoptosis of T cells induced by TNF? or T-cell receptor ligation in vitro and effects of anti-PD-L1 antibody administration were measured by flow cytometry. CD14+ monocytes of septic shock patients were purified and incubated with either lipopolysaccharide, anti-PD-L1 antibody, isotype antibody, or a combination of lipopolysaccharide and anti-PD-L1 antibody or isotype antibody. Supernatants were harvested to examine production of cytokines by ELISA. Results Compared with healthy controls, septic shock induced a marked increase in apoptosis as detected by the annexin-V binding and active caspase-3 on CD4+ T cells, CD8+ T cells and CD19+ B cells. Expression of PD-1 on T cells and of PD-L1 on monocytes was dramatically upregulated in septic shock patients. PD-1/PD-L1 pathway blockade in vitro with anti-PD-L1 antibody decreased apoptosis of T cells induced by TNF? or T-cell receptor ligation. Meanwhile, this blockade potentiated the lipopolysaccharide-induced TNF? and IL-6 production and decreased IL-10 production by monocytes in vitro. Conclusions The expression of PD-1 on T cells and PD-L1 on monocytes was upregulated in septic shock patients. The PD-1/PD-L1 pathway might play an essential role in sepsis-induced immunosuppression. PMID:21349174

2011-01-01

219

Hypergravity-induced immunomodulation in a rodent model: lymphocytes and lymphoid organs  

NASA Technical Reports Server (NTRS)

The major goal of this study was to quantify changes in lymphoid organs and cells over time due to centrifugation-induced hypergravity. C57BL/6 mice were exposed to 1, 2 and 3 G and the following assays were performed on days 1, 4, 7, 10, and 21: spleen, thymus, lung, and liver masses; total leukocyte, lymphocyte, monocyte/macrophage, and granulocyte counts; level of splenocyte apoptosis; enumeration of CD3+ T, CD3+/CD4+ T helper, CD3+/CD8+ T cytotoxic, B220+ B, and NK1.1+ natural killer cells; and quantification of cells expressing CD25, CD69, and CD71 activation markers. The data show that increased gravity resulted in decreased body, spleen, thymus, and liver, but not lung, mass. Significant reductions were noted in all three major leukocyte populations (lymphocytes, granulocytes, monocyte/macrophages) [correction of macrphages] with increased gravity; persistent depletion was noted in blood but not spleen. Among the various lymphocyte populations, the CD3+/CD8+ T cells and B220+ B cells were the most affected and NK1.1+ NK cells the least affected. Overall, the changes were most evident during the first week, with a greater influence noted for cells in the spleen. A linear relationship was found between some of the measurements and the level of gravity, especially on day 4. These findings indicate that hypergravity profoundly alters leukocyte number and distribution in a mammalian model and that some aberrations persisted throughout the three weeks of the study. In certain cases, the detected changes were similar to those observed after whole-body irradiation. In future investigations we hope to combine hypergravity with low-dose rate irradiation and immune challenge.

Gridley, Daila S.; Pecaut, Michael J.; Green, Lora M.; Miller, Glen M.; Nelson, Gregory A.

2002-01-01

220

Epidemiological evaluation of release of monocyte TNF-alpha as an exposure and effect marker in pneumoconiosis: a five year follow up study of coal workers.  

PubMed Central

OBJECTIVES--To determine (a) reproducibility with previous cross sectional findings, and (b) the predictive value of initial release of tumour necrosis factor-alpha (TNF-alpha) towards later progression of coalworkers' pneumoconiosis (CWP). METHODS--Release of monocyte TNF-alpha after in vitro stimulation with coal mine dust, silica, and endotoxin was measured in 104 retired miners and was related to stage of CWP (chest radiograph) and cumulative exposure. A subgroup of 46 miners was screened by high resolution computed tomography (HRCT). Prospective analysis of TNF-alpha (40 out of 104 miners involved in the previous TNF-alpha study) was done by relating initial TNF-alpha to five year progression of CWP measured by comparison of paired chest radiographs. RESULTS--As observed previously, dust stimulated release of TNF-alpha was increased in miners, especially in the early stages of pneumoconiosis. Cumulative exposure was related to pneumoconiotic stage but not to release of TNF-alpha. This excluded TNF-alpha as an exposure marker. Initial concentrations (1987) of TNF-alpha were related to later progression of CWP. Miners who showed abnormally high dust stimulated release of TNF-alpha had an increased risk of progression in CWP (relative risk 8.1). CONCLUSIONS--These results show (a) the significant involvement of TNF-alpha in pneumoconiosis in humans induced by coal dust and (b) that this routine test possibly constitutes a powerful tool to estimate individual prognosis of pneumoconiotic disease, even after the end of occupational exposure. PMID:7670618

Schins, R P; Borm, P J

1995-01-01

221

Manganese Supplementation Reduces High Glucose-induced Monocyte Adhesion to Endothelial Cells and Endothelial Dysfunction in Zucker Diabetic Fatty Rats*  

PubMed Central

Endothelial dysfunction is a hallmark of increased vascular inflammation, dyslipidemia, and the development of atherosclerosis in diabetes. Previous studies have reported lower levels of Mn2+ in the plasma and lymphocytes of diabetic patients and in the heart and aortic tissue of patients with atherosclerosis. This study examines the hypothesis that Mn2+ supplementation can reduce the markers/risk factors of endothelial dysfunction in type 2 diabetes. Human umbilical vein endothelial cells (HUVECs) were cultured with or without Mn2+ supplementation and then exposed to high glucose (HG, 25 mm) to mimic diabetic conditions. Mn2+ supplementation caused a reduction in monocyte adhesion to HUVECs treated with HG or MCP-1. Mn2+ also inhibited ROS levels, MCP-1 secretion, and ICAM-1 up-regulation in HUVECs treated with HG. Silencing studies using siRNA against MnSOD showed that similar results were observed in MnSOD knockdown HUVECs following Mn2+ supplementation, suggesting that the effect of manganese on monocyte adhesion to endothelial cells is mediated by ROS and ICAM-1, but not MnSOD. To validate the relevance of our findings in vivo, Zucker diabetic fatty rats were gavaged daily with water (placebo) or MnCl2 (16 mg/kg of body weight) for 7 weeks. When compared with placebo, Mn2+-supplemented rats showed lower blood levels of ICAM-1 (17%, p < 0.04), cholesterol (25%, p < 0.05), and MCP-1 (28%, p = 0.25). These in vitro and in vivo studies demonstrate that Mn2+ supplementation can down-regulate ICAM-1 expression and ROS independently of MnSOD, leading to a decrease in monocyte adhesion to endothelial cells, and therefore can lower the risk of endothelial dysfunction in diabetes. PMID:23329836

Burlet, Elodie; Jain, Sushil K.

2013-01-01

222

Helicobacter pylori Lipopolysaccharide Binds to CD14 and Stimulates Release of Interleukin8, Epithelial Neutrophil Activating Peptide 78, and Monocyte Chemotactic Protein 1 by Human Monocytes  

Microsoft Academic Search

Helicobacter pylori gastritis is characterized by leukocyte infiltration of the gastric mucosa. The aims of this study were to determine whether H. pylori-derived factors stimulate chemokine release from human monocytes and to ascertain whether H. pylori lipopolysaccharide (LPS) may be responsible for this effect. Human peripheral blood monocytes were exposed to an H. pylori water extract (HPE) or to purified

CHARLES M. BLISS; DOUGLAS T. GOLENBOCK; SARAH KEATES; JOANNE K. LINEVSKY; CIARAN P. KELLY

1998-01-01

223

Lenalidomide interferes with tumor-promoting properties of nurse-like cells in chronic lymphocytic leukemia.  

PubMed

Lenalidomide is an immunomodulatory agent clinically active in chronic lymphocytic leukemia patients. The specific mechanism of action is still undefined, but includes modulation of the microenvironment. In chronic lymphocytic leukemia patients, nurse-like cells differentiate from CD14(+) mononuclear cells and protect chronic lymphocytic leukemia cells from apoptosis. Nurse-like cells resemble M2 macrophages with potent immunosuppressive functions. Here, we examined the effect of lenalidomide on the monocyte/macrophage population in chronic lymphocytic leukemia patients. We found that lenalidomide induces high actin polymerization on CD14(+) monocytes through activation of small GTPases, RhoA, Rac1 and Rap1 that correlated with increased adhesion and impaired monocyte migration in response to CCL2, CCL3 and CXCL12. We observed that lenalidomide increases the number of nurse-like cells that lost the ability to nurture chronic lymphocytic leukemia cells, acquired properties of phagocytosis and promoted T-cell proliferation. Gene expression signature, induced by lenalidomide in nurse-like cells, indicated a reduction of pivotal pro-survival signals for chronic lymphocytic leukemia, such as CCL2, IGF1, CXCL12, HGF1, and supported a modulation towards M1 phenotype with high IL2 and low IL10, IL8 and CD163. Our data provide new insights into the mechanism of action of lenalidomide that mediates a pro-inflammatory switch of nurse-like cells affecting the protective microenvironment generated by chronic lymphocytic leukemia into tissues. PMID:25398834

Fiorcari, Stefania; Martinelli, Silvia; Bulgarelli, Jenny; Audrito, Valentina; Zucchini, Patrizia; Colaci, Elisabetta; Potenza, Leonardo; Narni, Franco; Luppi, Mario; Deaglio, Silvia; Marasca, Roberto; Maffei, Rossana

2015-02-01

224

Human Monocyte-Derived Dendritic Cells Exposed to Microorganisms Involved in Hypersensitivity Pneumonitis Induce a Th1-Polarized Immune Response  

PubMed Central

Hypersensitivity pneumonitis (HP) is an immunoallergic disease characterized by a prominent interstitial infiltrate composed predominantly of lymphocytes secreting inflammatory cytokines. Dendritic cells (DCs) are known to play a pivotal role in the lymphocytic response. However, their cross talk with microorganisms that cause HP has yet to be elucidated. This study aimed to investigate the initial interactions between human monocyte-derived DCs (MoDCs) and four microorganisms that are different in nature (Saccharopolyspora rectivirgula [actinomycetes], Mycobacterium immunogenum [mycobacteria], and Wallemia sebi and Eurotium amstelodami [filamentous fungi]) and are involved in HP. Our objectives were to determine the cross talk between MoDCs and HP-causative agents and to determine whether the resulting immune response varied according to the microbial extract tested. The phenotypic activation of MoDCs was measured by the increased expression of costimulatory molecules and levels of cytokines in supernatants. The functional activation of MoDCs was measured by the ability of MoDCs to induce lymphocytic proliferation and differentiation in a mixed lymphocytic reaction (MLR). E. amstelodami-exposed (EA) MoDCs expressed higher percentages of costimulatory molecules than did W. sebi-exposed (WS), S. rectivirgula-exposed (SR), or M. immunogenum-exposed (MI) MoDCs (P < 0.05, Wilcoxon signed-rank test). EA-MoDCs, WS-MoDCs, SR-MoDCs, and MI-MoDCs induced CD4+ T cell proliferation and a Th1-polarized immune response. The present study provides evidence that, although differences were initially observed between MoDCs exposed to filamentous fungi and MoDCs exposed to bacteria, a Th1 response was ultimately promoted by DCs regardless of the microbial extract tested. PMID:23720369

Pallandre, Jean-René; Borg, Christophe; Loeffert, Sophie; Gbaguidi-Haore, Houssein; Millon, Laurence

2013-01-01

225

Viral Cross-Class Serpin Inhibits Vascular Inflammation and T Lymphocyte Fratricide; A Study in Rodent Models In Vivo and Human Cell Lines In Vitro  

PubMed Central

Poxviruses express highly active inhibitors, including serine proteinase inhibitors (serpins), designed to target host immune defense pathways. Recent work has demonstrated clinical efficacy for a secreted, myxomaviral serpin, Serp-1, which targets the thrombotic and thrombolytic proteases, suggesting that other viral serpins may have therapeutic application. Serp-2 and CrmA are intracellular cross-class poxviral serpins, with entirely distinct functions from the Serp-1 protein. Serp-2 and CrmA block the serine protease granzyme B (GzmB) and cysteine proteases, caspases 1 and 8, in apoptotic pathways, but have not been examined for extracellular anti-inflammatory activity. We examined the ability of these cross-class serpins to inhibit plaque growth after arterial damage or transplant and to reduce leukocyte apoptosis. We observed that purified Serp-2, but not CrmA, given as a systemic infusion after angioplasty, transplant, or cuff-compression injury markedly reduced plaque growth in mouse and rat models in vivo. Plaque growth was inhibited both locally at sites of surgical trauma, angioplasty or transplant, and systemically at non-injured sites in ApoE-deficient hyperlipidemic mice. With analysis in vitro of human cells in culture, Serp-2 selectively inhibited T cell caspase activity and blocked cytotoxic T cell (CTL) mediated killing of T lymphocytes (termed fratricide). Conversely, both Serp-2 and CrmA inhibited monocyte apoptosis. Serp-2 inhibitory activity was significantly compromised either in vitro with GzmB antibody or in vivo in ApoE/GzmB double knockout mice. Conclusions The viral cross-class serpin, Serp-2, that targets both apoptotic and inflammatory pathways, reduces vascular inflammation in a GzmB-dependent fashion in vivo, and inhibits human T cell apoptosis in vitro. These findings indicate that therapies targeting Granzyme B and/or T cell apoptosis may be used to inhibit T lymphocyte apoptosis and inflammation in response to arterial injury. PMID:23049756

Liu, Liying; Dai, Erbin; Turner, Peter C.; Togonu-Bickersteth, Babajide; Richardson, Jakob; Davids, Jennifer A.; Williams, Jennifer M.; Bartee, Mee Y.; Chen, Hao; van Berkel, Theo J. C.; Biessen, Erik A. L.; Moyer, Richard W.; Lucas, Alexandra R.

2012-01-01

226

Viral cross-class serpin inhibits vascular inflammation and T lymphocyte fratricide; a study in rodent models in vivo and human cell lines in vitro.  

PubMed

Poxviruses express highly active inhibitors, including serine proteinase inhibitors (serpins), designed to target host immune defense pathways. Recent work has demonstrated clinical efficacy for a secreted, myxomaviral serpin, Serp-1, which targets the thrombotic and thrombolytic proteases, suggesting that other viral serpins may have therapeutic application. Serp-2 and CrmA are intracellular cross-class poxviral serpins, with entirely distinct functions from the Serp-1 protein. Serp-2 and CrmA block the serine protease granzyme B (GzmB) and cysteine proteases, caspases 1 and 8, in apoptotic pathways, but have not been examined for extracellular anti-inflammatory activity. We examined the ability of these cross-class serpins to inhibit plaque growth after arterial damage or transplant and to reduce leukocyte apoptosis. We observed that purified Serp-2, but not CrmA, given as a systemic infusion after angioplasty, transplant, or cuff-compression injury markedly reduced plaque growth in mouse and rat models in vivo. Plaque growth was inhibited both locally at sites of surgical trauma, angioplasty or transplant, and systemically at non-injured sites in ApoE-deficient hyperlipidemic mice. With analysis in vitro of human cells in culture, Serp-2 selectively inhibited T cell caspase activity and blocked cytotoxic T cell (CTL) mediated killing of T lymphocytes (termed fratricide). Conversely, both Serp-2 and CrmA inhibited monocyte apoptosis. Serp-2 inhibitory activity was significantly compromised either in vitro with GzmB antibody or in vivo in ApoE/GzmB double knockout mice. Conclusions The viral cross-class serpin, Serp-2, that targets both apoptotic and inflammatory pathways, reduces vascular inflammation in a GzmB-dependent fashion in vivo, and inhibits human T cell apoptosis in vitro. These findings indicate that therapies targeting Granzyme B and/or T cell apoptosis may be used to inhibit T lymphocyte apoptosis and inflammation in response to arterial injury. PMID:23049756

Viswanathan, Kasinath; Bot, Ilze; Liu, Liying; Dai, Erbin; Turner, Peter C; Togonu-Bickersteth, Babajide; Richardson, Jakob; Davids, Jennifer A; Williams, Jennifer M; Bartee, Mee Y; Chen, Hao; van Berkel, Theo J C; Biessen, Erik A L; Moyer, Richard W; Lucas, Alexandra R

2012-01-01

227

Distinct contribution of protein kinase C? and protein kinase C? in the lifespan and immune response of human blood monocyte subpopulations.  

PubMed

Monocytes, key components of the immune system, are a heterogeneous population comprised of classical monocytes (CD16(-) ) and non-classical monocytes (CD16(+) ). Monocytes are short lived and undergo spontaneous apoptosis, unless stimulated. Dysregulation of monocyte numbers contribute to the pathophysiology of inflammatory diseases, yet the contribution of each subset remains poorly characterized. Protein kinase C (PKC) family members are central to monocyte biology; however, their role in regulating lifespan and immune function of CD16(-) and CD16(+) monocytes has not been studied. Here, we evaluated the contribution of PKC? and PKC? in the lifespan and immune response of both monocyte subsets. We showed that CD16(+) monocytes are more susceptible to spontaneous apoptosis because of the increased caspase-3, -8 and -9 activities accompanied by higher kinase activity of PKC?. Silencing of PKC? reduced apoptosis in both CD16(+) and CD16(-) monocytes. CD16(+) monocytes express significantly higher levels of PKC? and produce more tumour necrosis factor-? in CD16(+) compared with CD16(-) monocytes. Silencing of PKC? affected the survival and tumour necrosis factor-? production. These findings demonstrate a complex network with similar topography, yet unique regulatory characteristics controlling lifespan and immune response in each monocyte subset, helping define subset-specific coordination programmes controlling monocyte function. PMID:25322815

Malavez, Yadira; Voss, Oliver H; Gonzalez-Mejia, Martha Elba; Parihar, Arti; Doseff, Andrea I

2015-04-01

228

Monocyte chemoattractant protein-1 is expressed in pancreatic islets from prediabetic NOD mice and in interleukin-1?-exposed human and rat islet cells  

Microsoft Academic Search

Aims\\/hypothesis. Monocyte chemoattractant protein-1 (MCP-1) attracts monocytes and T lymphocytes, and could thus contribute to mononuclear\\u000a cell infiltration in Type I (insulin-dependent) diabetes mellitus. Cytokines induce MCP-1 mRNA expression in pancreatic rat\\u000a beta cells. To investigate this issue, we analysed the signal transduction for IL-1?-induced MCP-1 expression in rat beta cells and in vitro MCP-1 mRNA expression and protein release

M.-C. Chen; P. Proost; C. Gysemans; C. Mathieu; D. L. Eizirik

2001-01-01

229

Characterization of the CD14++CD16+ Monocyte Population in Human Bone Marrow  

PubMed Central

Numerous studies have divided blood monocytes according to their expression of the surface markers CD14 and CD16 into following subsets: classical CD14++CD16?, intermediate CD14++CD16+ and nonclassical CD14+CD16++ monocytes. These subsets differ in phenotype and function and are further correlated to cardiovascular disease, inflammation and cancer. However, the CD14/CD16 nature of resident monocytes in human bone marrow remains largely unknown. In the present study, we identified a major population of CD14++CD16+ monocytes by using cryopreserved bone marrow mononuclear cells from healthy donors. These cells express essential monocyte-related antigens and chemokine receptors such as CD11a, CD18, CD44, HLA-DR, Ccr2, Ccr5, Cx3cr1, Cxcr2 and Cxcr4. Notably, the expression of Ccr2 was inducible during culture. Furthermore, sorted CD14++CD16+ bone marrow cells show typical macrophage morphology, phagocytic activity, angiogenic features and generation of intracellular oxygen species. Side-by-side comparison of the chemokine receptor profile with unpaired blood samples also demonstrated that these rather premature medullar monocytes mainly match the phenotype of intermediate and partially of (non)classical monocytes. Together, human monocytes obviously acquire their definitive CD14/CD16 signature in the bloodstream and the medullar monocytes probably transform into CD14++CD16? and CD14+CD16++ subsets which appear enriched in the periphery. PMID:25369328

Mandl, Manuela; Schmitz, Susanne; Weber, Christian; Hristov, Michael

2014-01-01

230

Monocyte implication in renal allograft dysfunction.  

PubMed

Macrophages are involved in the development and progression of kidney fibrosis. The aim of this study was to analyse the phenotype of circulating monocytes and their ability to predict kidney allograft dysfunction in living kidney transplant recipients. Whole blood samples from 25 kidney recipients and 17 donors were collected at five time-points. Monocyte phenotype was analysed by flow cytometry, and interleukin (IL)-10 and soluble CD163 by enzyme-linked immunosorbent assay. One week after transplantation, surface CD163 and IL-10 levels increased significantly from baseline [2·99?±?1·38 mean fluorescence intensity (MFI) to 5·18?±?2·42 MFI for CD163; 4·5?±?1·46?pg/ml to 6·7?±?2·5?pg/ml for IL-10]. This CD163 increase correlated with 4-month creatinine levels (r?=?0·4394, P?=?0·04). However, soluble CD163 decreased significantly from baseline at 1 week (797·11?±?340·45?ng/ml to 576·50?±?293·60?ng/ml). CD14(+) CD16(-) monocytes increased at 4 months and correlated positively with creatinine levels at 12 and 24 months (r?=?0·6348, P?=?0·002 and r?=?0·467, P?=?0·028, respectively) and negatively with Modification of Diet in Renal Disease (MDRD) at 12 months (r?=?0·6056, P?=?0·003). At 4 months, IL-10 decreased significantly (P?=?0·008) and correlated positively with creatinine at 2 years (r?=?0·68, P?=?0·010) and with CD14(+) CD16(-) monocytes at 4 months (r?=?0·732, P?=?0·004). At 24?h, levels of human leucocyte antigen D-related declined from 12·12?±?5·99 to 5·21?±?3·84 and CD86 expression decreased from 2·76?±?1·08 to 1·87?±?0·95. Both markers recovered progressively until 12 months, when they decreased again. These results indicate that monitoring monocytes could be a promising new prognostic tool of graft dysfunction in renal transplant patients. PMID:24134783

Guillén-Gómez, E; Guirado, L; Belmonte, X; Maderuelo, A; Santín, S; Juarez, C; Ars, E; Facundo, C; Ballarín, J A; Vidal, S; Díaz-Encarnación, M M

2014-02-01

231

Immunomodulatory activity of a plant extract containing human papillomavirus 16-E7 protein in human monocyte-derived dendritic cells.  

PubMed

This study reports the immunomodulatory activity on human monocyte derived dendritic cells (MDDCs) of a vaccine preparation shown to be effective against an HPV16-related tumour in an animal model. The vaccine is composed of extract from Nicotiana benthamiana leaves containing HPV16 E7 protein expressed by a potato virus X-derived vector (NbPVX-E7). The effect of the extract was evaluated on MDDC differentiation and maturation by monitoring the phenotypic expression of specific markers. The results show that NbPVX-E7 does not induce monocyte differentiation to dendritic cells, but does induce MDDC maturation. Plant extract does not influence MDDC-uptake of E7-FITC while it significantly improves the Ovalbumin-FITC uptake, considered as a model antigen. Importantly, NbPVX-E7-pulsed MDDCs/PBMCs are able to prime human blood-derived lymphocytes from healthy individuals to induce HPV16 E7-specific cytotoxic activity. This is a propaedeutic study for a possible use of E7-containing plant extract in human immunotherapy of HPV-related lesions. PMID:20074460

Di Bonito, P; Grasso, F; Mangino, G; Massa, S; Illiano, E; Franconi, R; Fanales-Belasio, E; Falchi, M; Affabris, E; Giorgi, C

2009-01-01

232

Caffeine sensitization of cultured mammalian cells and human lymphocytes irradiated with gamma rays and fast neutrons: a study of relative biological effectiveness in relation to cellular repair  

SciTech Connect

The sensitizing effects of caffeine were studied in baby hamster kidney (BHK-21) cells and human lymphocytes following irradiation with gamma rays and fast neutrons. Caffeine sensitization occurred only when log-phase BHK cells and mitogen-stimulated lymphocytes were exposed to the two radiations. Noncycling (confluent) cells of BHK resulted in a shouldered survival curve following gamma irradiation while a biphasic curve was obtained with the log-phase cells. Survival in the case of lymphocytes was estimated by measurement of (TH)thymidine uptake. The relative biological effectiveness (RBE) of fast neutrons was found to be greater at survival levels corresponding to the resistant portions of the survival curves (shoulder or resistant tail). In both cell types, no reduction in RBE was observed when caffeine was present, because caffeine affected both gamma and neutron survival by the same proportion.

Hannan, M.A.; Gibson, D.P.

1985-10-01

233

Monocyte recruitment during infection and inflammation  

Microsoft Academic Search

Monocytes originate from progenitors in the bone marrow and traffic via the bloodstream to peripheral tissues. During both homeostasis and inflammation, circulating monocytes leave the bloodstream and migrate into tissues where, following conditioning by local growth factors, pro-inflammatory cytokines and microbial products, they differentiate into macrophage or dendritic cell populations. Recruitment of monocytes is essential for effective control and clearance

Chao Shi; Eric G. Pamer

2011-01-01

234

Identification of Distinct Monocyte Phenotypes and Correlation with Circulating Cytokine Profiles in Acute Response to Spinal Cord Injury: A Pilot Study  

PubMed Central

Background Macrophage infiltration to the injury site during the acute response to traumatic spinal cord injury (SCI) is not uniform. Macrophage phenotype has been characterized as either pro-inflammatory (M1) or anti-inflammatory (M2). Animal studies suggest that M1/M2 dominance at the site of injury relates to spontaneous recovery following SCI. Objective To investigate whether the phenotype of circulating macrophage precursors-monocytes (MOs), is altered in the acute phase of SCI and corresponds to circulating inflammatory cytokines. Study Design Prospective observational cohort study. Setting A single academic medical center in Pennsylvania, US. Patients A cohort of 27 complete or incomplete traumatic SCI subjects enrolled within 7 days post-SCI injury. Methods MO phenotype was defined within the first week post-SCI, using flow cytometry, and compared to historical uninjured controls. Concentrations of 25 cytokines/chemokines were assessed using Luminex in serial blood samples up to two weeks post-SCI. ANOVA was used to determine the correlations between the phenotypes and the cytokine profiles. Results Patients subsets were identified with either M1 dominant or M2 dominant circulating MOs distinct from the uninjured controls. The M1-dominant was associated with higher circulating levels of pro-inflammatory mediators IL-12p70 and IP-10, and lower levels of anti-inflammatory cytokines IL-10, IL-15 and IL-7, whereas the M2-dominant exhibited the opposite cytokine profiles with significantly higher IL-10 and IL-7. Conclusion In the acute phase after SCI, at comparable injury severity, subgroups of patients exhibit distinct M1/M2 MOs dominance and the phenotype is correlated with M1 or M2-specific cytokine/chemokine profiles. Though further studies are needed to determine how these observed phenotypic differences relate to functional recovery, our findings 1) provide the first evidence indicating the possible individual differences in the immune responses to the comparable traumatic SCI, with potential implications for management of acute SCI and rehabilitation; 2) may represent easily accessible biomarkers with prognostic utility. PMID:24140737

Huang, Wan; Vodovotz, Yoram; Kusturiss, Mary B.; Barclay, Derek; Greenwald, Karen; Boninger, Michael L.; Coen, Paul M.; Brienza, David; Sowa, Gwendolyn

2014-01-01

235

Hypoxia-inducible C-to-U coding RNA editing downregulates SDHB in monocytes  

PubMed Central

Background. RNA editing is a post-transcriptional regulatory mechanism that can alter the coding sequences of certain genes in response to physiological demands. We previously identified C-to-U RNA editing (C136U, R46X) which inactivates a small fraction of succinate dehydrogenase (SDH; mitochondrial complex II) subunit B gene (SDHB) mRNAs in normal steady-state peripheral blood mononuclear cells (PBMCs). SDH is a heterotetrameric tumor suppressor complex which when mutated causes paraganglioma tumors that are characterized by constitutive activation of hypoxia inducible pathways. Here, we studied regulation, extent and cell type origin of SDHB RNA editing. Methods. We used short-term cultured PBMCs obtained from random healthy platelet donors, performed monocyte enrichment by cold aggregation, employed a novel allele-specific quantitative PCR method, flow cytometry, immunologic cell separation, gene expression microarray, database analysis and high-throughput RNA sequencing. Results. While the editing rate is low in uncultured monocyte-enriched PBMCs (average rate 2.0%, range 0.4%–6.3%, n = 42), it is markedly upregulated upon exposure to 1% oxygen tension (average rate 18.2%, range 2.8%–49.4%, n = 14) and during normoxic macrophage differentiation in the presence of serum (average rate 10.1%, range 2.7%–18.8%, n = 17). The normoxic induction of SDHB RNA editing was associated with the development of dense adherent aggregates of monocytes in culture. CD14-positive monocyte isolation increased the percentages of C136U transcripts by 1.25-fold in normoxic cultures (n = 5) and 1.68-fold in hypoxic cultures (n = 4). CD14-negative lymphocytes showed no evidence of SDHB editing. The SDHB genomic DNA remained wild-type during increased RNA editing. Microarray analysis showed expression changes in wound healing and immune response pathway genes as the editing rate increased in normoxic cultures. High-throughput sequencing of SDHB and SDHD transcripts confirmed the induction of C136U RNA editing in normoxic cultures but showed no additional verifiable coding edits. Analysis of SDHB RNA sequence data from 16 normal human tissues from the Illumina Body Map and from 45 samples representing 23 different cell types from the ENCODE projects confirmed the occurrence of site-specific C136U editing in whole blood (1.7%) and two primary CD14+ monocyte samples (1.9% and 2.6%). In contrast, the other cell types showed an average of 0.2% and 0.1% C136U editing rates in the two databases, respectively. Conclusions. These findings demonstrate that C-to-U coding RNA editing of certain genes is dynamically induced by physiologically relevant environmental factors and suggest that epigenetic downregulation of SDHB by site-specific RNA editing plays a role in hypoxia adaptation in monocytes. PMID:24058882

De Jong, Kitty; Liu, Biao; Wang, Jianmin; Patnaik, Santosh K.; Wallace, Paul K.; Taggart, Robert T.

2013-01-01

236

Decrease in helper (T4+) lymphocytes following cimetidine treatment for duodenal ulcer.  

PubMed Central

We studied the possible in vivo influence of cimetidine on peripheral blood lymphocyte (PBL) subpopulations defined with monoclonal antibodies (MoAb) in eight haematologically normal patients with uncomplicated duodenal ulcers before cimetidine treatment, 1 week after the start, and finally 1 week following cessation of therapy. After cimetidine had been given for 3-5 weeks there was a significant decrease, compared with pretreatment numbers, in the proportion of T3+ cells (64.6 +/- 8.1 (mean +/- s.d.) v 51.0 +/- 7.8%) and in T4+ cells (47.3 +/- 4.3 v 30.8 +/- 4.7%). The number of T8+ cells was not affected (20.3 +/- 4.3 v 20.1 +/- 6.7%). These changes resulted in a significant reduction in the T4/T8 ratio (2.46 +/- 0.8 v 1.67 +/- 0.6). The total numbers of lymphocytes and monocytes as well as the percentage of B1+ lymphocytes did not change significantly. The observed decrease in T4/T8 ratio after cimetidine treatment is explained by a reduction in the number of T4+ cells and the appearance of a new subpopulation of T3-, T4-, T8-, B1-lymphocytes. The underlying mechanism, however, is not clear. Cimetidine does not seem to have a direct receptor-modulating effect, since in vitro exposure of normal lymphocytes to the drug did not change the proportions of the T cell subsets. PMID:2942318

Hast, R; Bernell, P; Befrits, R; Dowding, C; Sjögren, A M

1986-01-01

237

Identification of a human peripheral blood monocyte subset that differentiates into osteoclasts  

PubMed Central

Increased bone resorption mediated by osteoclasts causes various diseases such as osteoporosis and bone erosion in rheumatoid arthritis (RA). Osteoclasts are derived from the monocyte/macrophage lineage, but the precise origin remains unclear. In the present study, we show that the purified CD16- human peripheral blood monocyte subset, but not the CD16+ monocyte subset, differentiates into osteoclast by stimulation with receptor activator of NF-?B ligand (RANKL) in combination with macrophage colony-stimulating factor (M-CSF). Integrin-?3 mRNA and the integrin-?v?3 heterodimer were only expressed on CD16- monocytes, when they were stimulated with RANKL + M-CSF. Downregulation of ?3-subunit expression by small interfering RNA targeting ?3 abrogated osteoclastogenesis from the CD16- monocyte subset. In contrast, the CD16+ monocyte subset expressed larger amounts of tumor necrosis factor alpha and IL-6 than the CD16- subset, which was further enhanced by RANKL stimulation. Examination of RA synovial tissue showed accumulation of both CD16+ and CD16- macrophages. Our results suggest that peripheral blood monocytes consist of two functionally heterogeneous subsets with distinct responses to RANKL. Osteoclasts seem to originate from CD16- monocytes, and integrin ?3 is necessary for osteoclastogenesis. Blockade of accumulation and activation of CD16- monocytes could therefore be a beneficial approach as an anti-bone resorptive therapy, especially for RA. PMID:16987426

Komano, Yukiko; Nanki, Toshihiro; Hayashida, Kenji; Taniguchi, Ken; Miyasaka, Nobuyuki

2006-01-01

238

CD14+CD16+ and CD14+CD163+ monocyte subpopulations in kidney allograft transplantation  

PubMed Central

Background Monocytes represent a heterogeneous population of cells subdivided according to the expression level of membrane antigens. A pro-inflammatory (intermediate/nonclassical) subpopulation of monocytes is defined by expression of CD16. CD163 seems to be characteristically preferentially expressed by immunosuppressive monocytes. The aim of our study was to evaluate the distribution of monocyte subpopulations in 71 patients with kidney allograft transplantation. Results The phenotype was evaluated by flow cytometry in defined time points. The proportions of peripheral CD14+CD16+ monocytes were downregulated immediately after the kidney transplantation and basiliximab treatment partially attenuated this trend. The transient downregulation of the CD14+CD16+ subpopulation was adjusted to basal values in two months. The proportions of CD14+CD163+ monocytes were transiently upregulated early after the kidney transplantation and remained higher during the first month in most patients. In ATG treated patients, the expansion of CD14+CD163+ monocytes was delayed but their upregulation lasted longer. In vitro data showed the direct effect of ATG and methylprednisolone on expression of CD16 and CD163 molecules while basiliximab did not affect the phenotype of cultured monocytes. Conclusions We assume from our data that kidney allograft transplantation is associated with modulation of monocyte subpopulations (CD14+CD16+ and CD14+CD163+) partially affected by an immunosuppressive regime used. PMID:24499053

2014-01-01

239

Buprenorphine Decreases the CCL2-Mediated Chemotactic Response of Monocytes.  

PubMed

Despite successful combined antiretroviral therapy, ?60% of HIV-infected people exhibit HIV-associated neurocognitive disorders (HAND). CCL2 is elevated in the CNS of infected people with HAND and mediates monocyte influx into the CNS, which is critical in neuroAIDS. Many HIV-infected opiate abusers have increased neuroinflammation that may augment HAND. Buprenorphine is used to treat opiate addiction. However, there are few studies that examine its impact on HIV neuropathogenesis. We show that buprenorphine reduces the chemotactic phenotype of monocytes. Buprenorphine decreases the formation of membrane projections in response to CCL2. It also decreases CCL2-induced chemotaxis and mediates a delay in reinsertion of the CCL2 receptor, CCR2, into the cell membrane after CCL2-mediated receptor internalization, suggesting a mechanism of action of buprenorphine. Signaling pathways in CCL2-induced migration include increased phosphorylation of p38 MAPK and of the junctional protein JAM-A. We show that buprenorphine decreases these phosphorylations in CCL2-treated monocytes. Using DAMGO, CTAP, and Nor-BNI, we demonstrate that the effect of buprenorphine on CCL2 signaling is opioid receptor mediated. To identify additional potential mechanisms by which buprenorphine inhibits CCL2-induced monocyte migration, we performed proteomic analyses to characterize additional proteins in monocytes whose phosphorylation after CCL2 treatment was inhibited by buprenorphine. Leukosialin and S100A9 were identified and had not been shown previously to be involved in monocyte migration. We propose that buprenorphine limits CCL2-mediated monocyte transmigration into the CNS, thereby reducing neuroinflammation characteristic of HAND. Our findings underscore the use of buprenorphine as a therapeutic for neuroinflammation as well as for addiction. PMID:25716997

Carvallo, Loreto; Lopez, Lillie; Che, Fa-Yun; Lim, Jihyeon; Eugenin, Eliseo A; Williams, Dionna W; Nieves, Edward; Calderon, Tina M; Madrid-Aliste, Carlos; Fiser, Andras; Weiss, Louis; Angeletti, Ruth Hogue; Berman, Joan W

2015-04-01

240

Carbon Black Particle Exhibits Size Dependent Toxicity in Human Monocytes  

PubMed Central

Increased levels of particulate air pollution are associated with increased respiratory and cardiovascular mortality and morbidity. Some epidemiologic and toxicological researches suggest ultrafine particles (<100?nm) to be more harmful per unit mass than larger particles. In the present study, the effect of particle size (nano and micro) of carbon black (CB) particle on viability, phagocytosis, cytokine induction, and DNA damage in human monocytes, THP-1 cells, was analysed. The cells were incubated with nanosize (~50?nm) and micron (~500?nm) size of CB particles in a concentration range of 50–800?µg/mL. The parameters like MTT assay, phagocytosis assay, ELISA, gene expression, and DNA analysis were studied. Exposure to nano- and micron-sized CB particles showed size- and concentration dependent decrease in cell viability and significant increase in proinflammatory cytokines IL-1?, TNF-? and IL-6 as well as chemokine IL-8 release. Gene expression study showed upregulation of monocyte chemoattractant protein-1 gene while cyclooxygenase-2 gene remained unaffected. Nano CB particles altered the phagocytic capacity of monocytes although micron CB had no significant effect. CB particles did not show any significant effect on DNA of monocytes. The investigations indicate that CB particles in nanosize exhibit higher propensity of inducing cytotoxicity, inflammation, and altered phagocytosis in human monocytes than their micron size. PMID:24669321

Kannan, G. M.; Vijayaraghavan, R.

2014-01-01

241

Aliphatic alcohols in spirits inhibit phagocytosis by human monocytes.  

PubMed

A large volume of alcoholic beverages containing aliphatic alcohols is consumed worldwide. Previous studies have confirmed the presence of ethanol-induced immunosuppression in heavy drinkers, thereby increasing susceptibility to infectious diseases. However, the aliphatic alcohols contained in alcoholic beverages might also impair immune cell function, thereby contributing to a further decrease in microbicidal activity. Previous research has shown that aliphatic alcohols inhibit phagocytosis by granulocytes but their effect on human monocytes has not been studied. This is important as they play a crucial role in engulfment and killing of pathogenic microorganisms and a decrease in their phagocytic activity could lead to impaired antimicrobial defence in heavy drinkers. The aim of this study was to measure monocyte phagocytosis following their treatment with those aliphatic alcohols detected in alcoholic beverages. Monocytes were separated from human peripheral blood and phagocytosis of opsonized zymosan particles by monocytes treated with ethanol and aliphatic alcohols individually and in combination was determined. It was shown that these alcohols could suppress the phagocytic activity of monocytes in a concentration-dependent manner and when combined with ethanol, they caused a further decrease in phagocytosis. Due to their additive effects, it is possible that they may inhibit phagocytosis in a clinically meaningful way in alcoholics and episodic heavy drinkers thereby contribute to their increased susceptibility to infectious diseases. However, further research is needed to address this question. PMID:25689949

Pál, László; Árnyas, Ervin M; Bujdosó, Orsolya; Baranyi, Gerg?; Rácz, Gábor; Ádány, Róza; McKee, Martin; Sz?cs, Sándor

2015-04-01

242

Lymphocyte-Predominant Hodgkin's Disease in Children: A Case Study and Review of the Literature  

PubMed Central

A three-year-old boy presented with an enlarging neck mass. Biopsy demonstrated IgD-positive nodular lymphocyte-predominant Hodgkin lymphoma (NLPHL), which was staged as IIa. The patient received cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) with rituximab and had excellent results. NLPHL is a relatively rare disease that is biologically distinct from classic Hodgkin lymphoma (cHL). NLPHL is a B-cell malignancy likely of germinal center origin that has an overall good prognosis and favorable response to treatment. Unlike cHL, NLPHL is ubiquitously CD20-positive. Recent evidence supports the efficacy of targeted anti-CD20 therapy in NLPHL, though prospective data is limited. This case demonstrates several unique features of NLPHL and further supports the use of rituximab in front-line therapy. The clinical characteristics among patients at various ages are discussed with a special focus on the IgD-positive subtype. A thorough literature search demonstrates this to be the youngest patient with NLPHL yet described. PMID:25878913

Stier, James R.; Vasquez, Robert J.

2015-01-01

243

Immunogenetic studies of chronic lymphocytic leukemia: revelations and speculations about ontogeny and clinical evolution.  

PubMed

Over the last decade, immunogenetic analysis of B-cell receptor immunoglobulins (BcR IG) has proved instrumental in dissecting chronic lymphocytic leukemia (CLL) pathogenesis. Initially, it was the finding that the level of somatic hypermutations in rearranged IG heavy-chain genes could define two CLL subtypes associated with a different clinical course that drew attention. As the years ensued, this not only continued to hold strong, but also revealed an unprecedented BcR restriction (aptly coined as "stereotypy"), thus cementing the idea that antigenic elements select the leukemic clones. With all this in mind, in the present review, we focus on the CLL BcR IG, a molecule that clearly lies at the heart of disease pathogenesis, and attempt to distil from past and emerging biologic knowledge the most relevant aspects in the context of the immunogenetics of CLL, while at the same time provoking questions that remain unanswered. We juxtapose CLL with mutated BcR IGs against CLL with unmutated BcR IGs due to their striking clinicobiologic differences; however, when considering ontogeny, common derivation of the two mutational subtypes cannot be excluded. The issue of stereotypy is intertwined throughout and we also raise the subject of isotype-switched CLL, which, despite its rarity, contributes intriguing ontogenetic hints. PMID:25074616

Vardi, Anna; Agathangelidis, Andreas; Sutton, Lesley-Ann; Ghia, Paolo; Rosenquist, Richard; Stamatopoulos, Kostas

2014-08-15

244

Supportive Care for Chronic Lymphocytic Leukemia  

MedlinePLUS

... lymphocytic leukemia treated? Chemotherapy for chronic lymphocytic leukemia Monoclonal antibodies for chronic lymphocytic leukemia Targeted therapy for chronic lymphocytic leukemia Surgery for chronic lymphocytic ...

245

Role of CCR8 and Other Chemokine Pathways in the Migration of Monocyte-derived Dendritic Cells to Lymph Nodes  

PubMed Central

Studying the influence of chemokine receptors (CCRs) on monocyte fate may reveal information about which subpopulations of monocytes convert to dendritic cells (DCs) and the migration pathways that they use. First, we examined whether prominent CCRs on different monocyte subsets, CCR2 or CX3CR1, mediated migration events upstream of the accumulation of monocyte-derived DCs in lymph nodes (LNs). Monocytes were labeled and traced by uptake of latex microspheres in skin. Unexpectedly, neither CCR2 nor CX3CR1 were required. However, absence of CCR2 led to an increased labeling of the minor Gr-1int monocyte population, and the number of latex+ DCs that emigrated to LNs was correspondingly increased. Characterization of Gr-1int monocytes revealed that they selectively expressed CCR7 and CCR8 mRNA in blood. CCR7 and CCR8 pathways were used by monocyte-derived DCs during mobilization from skin to LNs. The role of CCR8 in emigration from tissues also applied to human monocyte-derived cells in a model of transendothelial trafficking. Collectively, the data suggest that Gr-1int monocytes may be most disposed to become a lymphatic-migrating DCs. When these monocyte-derived DCs exit skin to emigrate to LNs, they use not only CCR7 but also CCR8, which was not previously recognized to participate in migration to LNs. PMID:15534368

Qu, Chunfeng; Edwards, Emmerson W.; Tacke, Frank; Angeli, Véronique; Llodrá, Jaime; Sanchez-Schmitz, Guzman; Garin, Alexandre; Haque, Nasreen S.; Peters, Wendy; van Rooijen, Nico; Sanchez-Torres, Carmen; Bromberg, Jonathan; Charo, Israel F.; Jung, Steffen; Lira, Sergio A.; Randolph, Gwendalyn J.

2004-01-01

246

Role of CCR8 and other chemokine pathways in the migration of monocyte-derived dendritic cells to lymph nodes.  

PubMed

Studying the influence of chemokine receptors (CCRs) on monocyte fate may reveal information about which subpopulations of monocytes convert to dendritic cells (DCs) and the migration pathways that they use. First, we examined whether prominent CCRs on different monocyte subsets, CCR2 or CX3CR1, mediated migration events upstream of the accumulation of monocyte-derived DCs in lymph nodes (LNs). Monocytes were labeled and traced by uptake of latex microspheres in skin. Unexpectedly, neither CCR2 nor CX3CR1 were required. However, absence of CCR2 led to an increased labeling of the minor Gr-1int monocyte population, and the number of latex+ DCs that emigrated to LNs was correspondingly increased. Characterization of Gr-1int monocytes revealed that they selectively expressed CCR7 and CCR8 mRNA in blood. CCR7 and CCR8 pathways were used by monocyte-derived DCs during mobilization from skin to LNs. The role of CCR8 in emigration from tissues also applied to human monocyte-derived cells in a model of transendothelial trafficking. Collectively, the data suggest that Gr-1int monocytes may be most disposed to become a lymphatic-migrating DCs. When these monocyte-derived DCs exit skin to emigrate to LNs, they use not only CCR7 but also CCR8, which was not previously recognized to participate in migration to LNs. PMID:15534368

Qu, Chunfeng; Edwards, Emmerson W; Tacke, Frank; Angeli, Véronique; Llodrá, Jaime; Sanchez-Schmitz, Guzman; Garin, Alexandre; Haque, Nasreen S; Peters, Wendy; van Rooijen, Nico; Sanchez-Torres, Carmen; Bromberg, Jonathan; Charo, Israel F; Jung, Steffen; Lira, Sergio A; Randolph, Gwendalyn J

2004-11-15

247

Monocyte Trafficking to Hepatic Sites of Bacterial Infection Is Chemokine Independent and Directed by Focal Intercellular Adhesion Molecule-1 Expression  

PubMed Central

Recruitment of CCR2+Ly6Chigh monocytes to sites of infection is essential for efficient clearance of microbial pathogens. Although CCR2-mediated signals promote monocyte emigration from bone marrow, the contribution of CCR2 to later stages of monocyte recruitment remains unresolved. In this article, we show that CCR2 deficiency markedly worsens hepatic Listeria monocytogenes infection because Ly6Chigh monocytes are retained in the bone marrow. Intravenously transferred, CCR2-deficient Ly6Chigh monocytes traffic normally to hepatic foci of infection and contribute to bacterial clearance. Pertussis toxin treatment of adoptively transferred monocytes does not impair their intrahepatic trafficking, suggesting that chemokine signaling, once CCR2+ Ly6Chigh monocytes emigrate from the bone marrow, is not required for monocyte localization to sites of bacterial infection in the liver. Expression of ICAM-1 is induced in close proximity to foci of bacterial infection in the liver, including on CD31+ endothelial cells, and blockade of CD11b and CD44 diminishes monocyte localization to these hepatic foci. Our studies demonstrated that Ly6Chigh monocyte recruitment from the bloodstream to the L. monocytogenes-infected liver does not require chemokine receptor-mediated signals but instead is principally dependent on integrin- and extracellular matrix-mediated monocyte adhesion. PMID:20435926

Shi, Chao; Velázquez, Peter; Hohl, Tobias M.; Leiner, Ingrid; Dustin, Michael L.; Pamer, Eric G.

2010-01-01

248

p53 Expression in circulating lymphocytes of non-melanoma skin cancer patients from an arsenic contaminated region in Mexico. A pilot study  

Microsoft Academic Search

Arsenic is a common environmental toxicant and epidemiological studies associate arsenic exposure with various pathologic disorders and several types of cancer. Skin cancers are the most common arsenic-induced neoplasias and the prevalence of skin lesions has been reported to be significantly elevated in individuals exposed to arsenic via drinking water in México. Being lymphocytes the main cells used for human

Ana M. Salazar; Emma Calderón-Aranda; Mariano E. Cebrián; Monserrat Sordo; Andrés Bendesky; Arístides Gómez-Muñoz; Leonor Acosta-Saavedra; Patricia Ostrosky-Wegman

2004-01-01

249

Evidence for Human Immunodeficiency Virus Type 1 Replication In Vivo in CD14+ Monocytes and Its Potential Role as a Source of Virus in Patients on Highly Active Antiretroviral Therapy  

Microsoft Academic Search

In vitro studies show that human immunodeficiency virus type 1 (HIV-1) does not replicate in freshly isolated monocytes unless monocytes differentiate to monocyte-derived macrophages. Similarly, HIV-1 may replicate in macrophages in vivo, whereas it is unclear whether blood monocytes are permissive to productive infection with HIV-1. We investigated HIV-1 replication in CD14 monocytes and resting and activated CD4 T cells

Tuofu Zhu; David Muthui; Sarah Holte; David Nickle; Feng Feng; Scott Brodie; Yon Hwangbo; James I. Mullins; Lawrence Corey

2002-01-01

250

Analysis of monocyte chemoattractant protein 1-mediated lung injury using rat lung organ cultures.  

PubMed Central

Using a rat lung organ culture system, we analyzed the role of monocyte chemoattractant protein 1 (MCP 1) in leukocyte to lung adhesive interactions and monocyte-mediated lung injury. Quantitative leukocyte to lung adhesive interactions were examined using an adaptation of the Woodruff-Stamper frozen section binding assay. Pretreatment of organ cultures with recombinant human tumor necrosis factor (rhTNF alpha) resulted in a protein synthesis-dependent increase in the adhesiveness of lung tissue for peripheral blood monocytes. Adhesion of monocytes to lung tissue was not increased above baseline after 7 hours but increased more than twofold by 24 hours and persisted through 48 hours. Binding of monocyte to lung tissue was further increased when recombinant rat MCP 1 was added to monocyte suspensions immediately before being layered onto lung sections derived from either TNF alpha-treated or untreated organ cultures. Addition of antibody directed against rat CD11b/c resulted in a moderate reduction in monocyte binding. TNF or lipopolysaccharide-induced activation of mononuclear cells in the presence of [3H]leucine-labeled organ cultures resulted in lung injury as assessed by radioisotope release. Mononuclear cell-mediated organ culture injury could be partially inhibited with anti-rat MCP 1 antibody, anti-rat CD11b/c antibody, or antioxidants including catalase and deferoxamine. Anti-MCP 1 and anti-CD11b/c increased the absolute numbers of monocytes that could be retrieved from monocyte-lung co-cultures while catalase and deferoxamine did not. In vitro studies revealed that isolated rat peripheral blood monocytes produce O2- in response to MCP 1. These data provide a functional correlate for recent in vitro studies which suggest that MCP 1 may mediate leukocyte adhesive processes by up-regulating beta 2 integrin expression on monocytes. This study provides evidence that monocytes activated by MCP 1 can damage lung tissue through an oxidant-mediated mechanism. Monocyte chemoattractant protein 1 may participate in the pathogenesis of monocyte-mediated lung injury by modulating inflammatory cell adhesion as well as through monocyte activation. Images Figure 2 PMID:8103296

Warren, J. S.; Jones, M. L.; Flory, C. M.

1993-01-01

251

Increased monocyte chemotactic protein-1 concentration and monocyte count independently associate with a poor prognosis in dogs with lymphoma.  

PubMed

Overexpression of the chemokine monocyte chemotactic protein-1 (MCP-1) has been associated with a poor prognosis in many human cancers. Increased MCP-1 concentrations may promote tumour progression by increasing mobilization of myeloid derived suppressor cells such as immature monocytes and neutrophils. We hypothesized that increased numbers of peripheral neutrophils or monocytes and increased MCP-1 concentrations would predict a worse outcome in dogs with multicentric lymphoma. In this retrospective study involving 26 client-owned dogs diagnosed with lymphoma, we show that peripheral neutrophil and monocyte counts as well as serum MCP-1 concentrations were significantly elevated relative to healthy control animals, and that such increases were associated with a decreased disease-free interval in dogs treated with chemotherapy based on cyclophosphamide, vincristine, doxorubicin and prednisone (CHOP). To our knowledge, this is the first study showing that pretreatment evaluation of monocyte and neutrophil counts can provide important prognostic information in dogs with lymphoma. The mechanisms underlying these observations remain to be determined. PMID:21303454

Perry, J A; Thamm, D H; Eickhoff, J; Avery, A C; Dow, S W

2011-03-01

252

Monocyte recruitment, activation, and function in the gut-associated lymphoid tissue during oral Salmonella infection.  

PubMed

Neutrophils, monocytes, and dendritic cells (DC) are phenotypically and functionally related phagocytes whose presence in infected tissues is critical to host survival. Their overlapping expression pattern of surface molecules, the differentiation capacity of monocytes, and the presence of monocyte subsets underscores the complexity of understanding the role of these cells during infection. In this study we use five- to seven-color flow cytometry to assess the phenotype and function of monocytes recruited to Peyer's patches (PP) and mesenteric lymph nodes (MLN) after oral Salmonella infection of mice. The data show that CD68(high)Gr-1(int) (intermediate) monocytes, along with CD68(int)Gr-1(high) neutrophils, rapidly accumulate in PP and MLN. The monocytes have increased MHC-II and costimulatory molecule expression and, in contrast to neutrophils and DC, produce inducible NO synthase. Although neutrophils and monocytes from infected mice produce TNF-alpha and IL-1beta upon ex vivo culture, DC do not. In addition, although recruited monocytes internalize Salmonella in vitro and in vivo they did not induce the proliferation of OT-II CD4(+) T cells after coincubation with Salmonella expressing OVA despite their ability to activate OT-II cells when pulsed with the OVA(323-339) peptide. We also show that recruited monocytes enter the PP of infected mice independently of the mucosal address in cell adhesion molecule-1 (MAdCAM-1). Finally, recruited but not resident monocytes increase in the blood of orally infected mice, and MHC-II up-regulation, but not TNF-alpha or iNOS production, occur already in the blood. These studies are the first to describe the accumulation and function of monocyte subsets in the blood and GALT during oral Salmonella infection. PMID:17442963

Rydström, Anna; Wick, Mary Jo

2007-05-01

253

TNF-alpha is secreted by monocytes in transit to become macrophages, but not by peripheral blood monocytes, following OK-432 (lyophilized S. pyogenes) stimulation.  

PubMed

OK-432, penicillin-killed Streptococcus pyogenes, is used in treating lymphangiomas and carcinomas. We have studied proinflammatory interleukin (IL) secretion following OK-432 stimulation of total blood, peripheral blood mononuclear cell (PBMC) and purified monocytes in vitro. OK-432 stimulation of purified monocytes gave IL-1beta, IL-1RA, IL-6, IL-12p40 and tumour necrosis factor (TNF)-alpha response. OK-432 stimulation of cells within blood did, however, not yield TNF-alpha secretion. When PBMC or monocytes were cultured in low-attachment wells a decreased IL secretion was observed compared to adherent cells. Inhibition of Syk kinase with piceatannol, only at high, non-specific doses, but not PI3 kinase inhibition with LY294002 or Wortmannin, decreased monocyte IL response to OK-432. This shows that beta(1-3)-integrin receptor function is not necessary for monocyte OK-432-stimulated TNF-alpha secretion. Direct blockage of the beta(2)-integrin (CD18) receptor by anti-CD18 antibody was also unable to prevent the stimulating effects of OK-432 in human monocytes. On the other hand, Syk phosphorylation is elevated upon adherence of monocytes and this is further increased by OK-432 stimulation, as shown by Western blot. The Fc-receptor was also ruled out as a main receptor of the OK-432 monocyte response. In conclusion, TNF-alpha secretion is only found in monocytes removed from blood. This TNF-alpha secretion is not mediated through the beta(1-3)-integrin receptors. OK-432 may act as a target-seeking substance whereby only monocytes adhered, e.g. to a tumour cell, become cytotoxic in part explaining why OK-432 is well suited as a cancer treatment drug. PMID:18021366

Olsnes, C; Stavang, H; Olofsson, J; Aarstad, H J

2007-12-01

254

Functional aspects of fish lymphocytes.  

PubMed

After almost 40 years of studies in comparative immunology, some light has been shed on the evolutive immunobiology of vertebrates, and experimental evidences have shown that acquired immunity, defined by somatic recombination of antigen-binding molecules and memory, is an achievement as ancient as jawless vertebrates. However, the molecular processes generating antigen receptors evolved independently between jawless and jawed fishes, and produced lymphocytic cells with similar functions but employing different sets of genes. In recent years, data have been provided describing some in vitro and in vivo functional responses of fish lymphocytes. After a long gap, the number of specific markers for fish lymphocytes is increasing, thus allowing a first characterisation of lymphocyte subsets. Overall, in the near future it will be possible to open a new chapter in fish immunology and investigate functional immunity of lymphocyte responses by combining the extensive knowledge on immune gene products with markers for molecules and cells. The present review summarizes current knowledge on functional features of fish lymphocytes. PMID:23707785

Scapigliati, Giuseppe

2013-10-01

255

Monocyte Fc gamma receptor expression in patients undergoing coronary artery bypass grafting  

Microsoft Academic Search

BackgroundCardiopulmonary bypass is associated with an inflammatory response with potential deleterious effects. The white cell subpopulation mostly investigated so far is the neutrophil. To date very little has been investigated regarding the role of the monocyte\\/macrophage. This study focuses on the expression of Fc gamma receptors I, II, and III by monocytes in patients undergoing cardiopulmonary bypass.

Demetrios C Stefanou; George Asimakopoulos; Darshna R Yagnik; Dorian O Haskard; Jon R Anderson; Pandelis Philippidis; R. Clive Landis; Kenneth M Taylor

2004-01-01

256

Mechanism of monocyte activation and expression of proinflammatory cytochemokines by placenta growth factor  

E-print Network

, and Vijay K. Kalra Monocytes from patients with sickle cell disease (SCD) are in an activated state. However, the mechanism of activation of monocytes in SCD is not known. Our studies showed that placenta growth fac- tor Society of Hematology Introduction The clinical manifestations of sickle cell disease (SCD) include

Giri, Ranjit K.

257

Fucoidan stimulation induces a functional maturation of human monocyte-derived dendritic cells  

Microsoft Academic Search

Fucoidan is a complex sulfated polysaccharide with a wide variety of biological activities for modulating immune cell functions. However, the effects of fucoidan on maturation process and activation of human monocyte-derived dendritic cells (DCs) remain to be elucidated. The present study demonstrated that the level of special marks and polarization phenotype of DCs was altered by fucoidan. Human monocytes were

Meixiang Yang; Chunhong Ma; Jintang Sun; Qianqian Shao; Wenjuan Gao; Yan Zhang; Zewu Li; Qi Xie; Zhaogang Dong; Xun Qu

2008-01-01

258

Lipopolysaccharide regulated protein expression is only partly impaired in monocytes from patients with type I diabetes  

Microsoft Academic Search

BACKGROUND: Monocytes play an important role in innate immunity and atherosclerosis. A disturbed secretion of cytokines in lipopolysaccharide (LPS) activated monocytes from type 1 diabetes (T1D) patients has been described and may contribute to the impaired inflammatory response in these individuals. In the present study the influence of LPS on five different proteins with a function in immunity and atherosclerosis

Gabriele Wehrwein; Markus Neumeier; Andreas Schäffler; Andrea Kopp; Johanna Weigert; Sabine Abke; Jürgen Schölmerich; Christa Buechler

2006-01-01

259

Monocyte chemoattractant protein-1 gene expression in prostatic hyperplasia and prostate adenocarcinoma.  

PubMed Central

Human monocyte chemoattractant protein-1 (MCP-1) has been shown to act as a chemokine in the recruitment of monocyte/macrophages during inflammation states. Furthermore, there is increasing evidence that MCP-1 is involved in the recruitment of tumor-associated macrophages. In vivo, one of the major cellular sources of MCP-1 are the smooth muscle cells. As MCP-1 gene expression and/or protein production in these cells is not necessarily correlated with the accumulation of inflammatory cells, there might possibly be additional functions of this cytokine. In the present study, we investigated by use of 35S-labeled antisense RNA probes whether the MCP-1 gene is expressed in tissue specimens of benign prostatic hyperplasia (n = 13) and specimens of prostate carcinoma (n = 8), both of which are characterized by a prominent fibromuscular stroma and inconspicuous inflammatory infiltrates. MCP-1 transcripts were located in stromal smooth muscle cells and, additionally, in basal cells of benign prostatic glands. In prostate carcinoma, the number of MCP-1 mRNA-expressing cells was significantly less than in benign prostatic hyperplasia. MCP-1 transcripts were located in preserved fibromuscular stroma and in basal cells of entrapped non-neoplastic glands but not in carcinomatous cells. Immunohistochemical staining with polyclonal antibodies raised against MCP-1 revealed strong reactivity in the fibromuscular stroma surrounding both benign and malignant glands. MCP-1 gene expression or immunoreactivity for anti-MCP-1 antibodies was not related to the rare, lymphocytic interstitial infiltrates. The results show that 1) in the absence of significant leukocyte accumulation, it is unlikely that MCP-1 exerts chemotactic functions in the prostate and 2) that MCP-1, in contrast to previous findings in a wide variety of other human neoplasms, is not expressed in carcinomatous cells of the prostate. Images Figure 2 Figure 3 Figure 4 PMID:8701989

Mazzucchelli, L.; Loetscher, P.; Kappeler, A.; Uguccioni, M.; Baggiolini, M.; Laissue, J. A.; Mueller, C.

1996-01-01

260

Involvement of Tweak in Interferon ?–Stimulated Monocyte Cytotoxicity  

PubMed Central

TWEAK, a new member of the tumor necrosis factor (TNF) family, induces cell death in some tumor cell lines, but its physiological functions are largely unknown. In this study, we investigated the expression and function of TWEAK in human peripheral blood mononuclear cells (PBMCs) by using newly generated anti–human TWEAK mAbs. Although freshly isolated PBMCs expressed no detectable level of TWEAK on their surfaces, a remarkable TWEAK expression was rapidly observed on monocytes upon stimulation with interferon (IFN)-? but not with IFN-? or lipopolysaccharide. Cytotoxic activity of IFN-?–stimulated monocytes against human squamous carcinoma cell line HSC3 was inhibited partially by anti-TWEAK mAb alone and almost completely by combination with anti-TRAIL (TNF-related apoptosis-inducing ligand) mAb. These results revealed a novel pathway of monocyte cytotoxicity against tumor cells that is mediated by TWEAK and potentiated by IFN-?. PMID:11067885

Nakayama, Masafumi; Kayagaki, Nobuhiko; Yamaguchi, Noriko; Okumura, Ko; Yagita, Hideo

2000-01-01

261

The HELIOS trial protocol: a phase III study of ibrutinib in combination with bendamustine and rituximab in relapsed/refractory chronic lymphocytic leukemia.  

PubMed

Ibrutinib is an orally administered, covalent inhibitor of Bruton's tyrosine kinase with activity in B-cell malignancies based on Phase I/II studies. We describe the design and rationale for the Phase III HELIOS trial (trial registration: EudraCT No. 2012-000600-15; UTN No. U1111-1135-3745) investigating whether ibrutinib added to bendamustine and rituximab (BR) provides benefits over BR alone in patients with relapsed/refractory chronic lymphocytic leukemia/small lymphocytic lymphoma. Eligible patients must have relapsed/refractory disease measurable on CT scan and meet ? 1 International Workshop on Chronic Lymphocytic Leukemia criterion for requiring treatment; patients with del(17p) are excluded. All patients receive BR (maximum six cycles) as background therapy and are randomized 1:1 to placebo or ibrutinib 420 mg/day. Treatment with ibrutinib or placebo will start concomitantly with BR and continue until disease progression or unacceptable toxicity. The primary end point is progression-free survival. Secondary end points include safety, objective response rate, overall survival, rate of minimal residual disease-negative remissions, and patient-reported outcomes. Tumor response will be assessed using the International Workshop on Chronic Lymphocytic Leukemia guidelines. PMID:24901734

Hallek, Michael; Kay, Neil E; Osterborg, Anders; Chanan-Khan, Asher A; Mahler, Michelle; Salman, Mariya; Wan, Ying; Sun, Steven; Zhuang, Sen Hong; Howes, Angela

2015-01-01

262

Macrophage plasticity and interaction with lymphocyte subsets: cancer as a paradigm  

Microsoft Academic Search

Plasticity is a hallmark of cells of the myelomonocytic lineage. In response to innate recognition or signals from lymphocyte subsets, mononuclear phagocytes undergo adaptive responses. Shaping of monocyte-macrophage function is an essential component of resistance to pathogens, tissue damage and repair. The orchestration of myelomonocytic cell function is a key element that links inflammation and cancer and provides a paradigm

Subhra K Biswas; Alberto Mantovani

2010-01-01

263

Characterization of a new chronic lymphocytic leukemia cell line for mechanistic in vitro and in vivo studies relevant to disease.  

PubMed

Studies of chronic lymphocytic leukemia (CLL) have yielded substantial progress, however a lack of immortalized cell lines representative of the primary disease has hampered a full understanding of disease pathogenesis and development of new treatments. Here we describe a novel CLL cell line (OSU-CLL) generated by EBV transformation, which displays a similar cytogenetic and immunophenotype observed in the patient's CLL (CD5 positive with trisomy 12 and 19). A companion cell line was also generated from the same patient (OSU-NB). This cell line lacked typical CLL characteristics, and is likely derived from the patient's normal B cells. In vitro migration assays demonstrated that OSU-CLL exhibits migratory properties similar to primary CLL cells whereas OSU-NB has significantly reduced ability to migrate spontaneously or towards chemokine. Microarray analysis demonstrated distinct gene expression patterns in the two cell lines, including genes on chromosomes 12 and 19, which is consistent with the cytogenetic profile in this cell line. Finally, OSU-CLL was readily transplantable into NOG mice, producing uniform engraftment by three weeks with leukemic cells detectable in the peripheral blood spleen and bone marrow. These studies describe a new CLL cell line that extends currently available models to study gene function in this disease. PMID:24130782

Hertlein, Erin; Beckwith, Kyle A; Lozanski, Gerard; Chen, Timothy L; Towns, William H; Johnson, Amy J; Lehman, Amy; Ruppert, Amy S; Bolon, Brad; Andritsos, Leslie; Lozanski, Arletta; Rassenti, Laura; Zhao, Weiqiang; Jarvinen, Tiina M; Senter, Leigha; Croce, Carlo M; Symer, David E; de la Chapelle, Albert; Heerema, Nyla A; Byrd, John C

2013-01-01

264

Acute Lymphocytic Leukemia  

MedlinePLUS

... hard for blood to do its work. In acute lymphocytic leukemia (ALL), also called acute lymphoblastic leukemia, there are too ... of white blood cells called lymphocytes or lymphoblasts. ALL is the most common type of cancer in ...

265

Effects of CpG-ODNs on phenotype and function of monocyte-derived dendritic cells in chronic hepatitis B  

PubMed Central

AIM: To study the effects of synthetic nonmethylated CpG-containing oligodeoxynucleotides (CpG-ODNs), either alone or combined with recombinant Hepatitis B surface antigen (HBsAg) polypeptide, on the phenotype, function, and intracellular signaling pathways of monocyte-derived dendritic cells (DCs) in patients with chronic hepatitis B (CHB). METHODS: Peripheral blood monocytes isolated from CHB patients and healthy volunteers were induced to be dendritic cells by recombinant human granulocyte-monocyte colony stimulating factor and interleukin-4. The DCs were then treated with CpG-ODNs, CpG-ODNs/HBsAg, or tumor necrosis factor (TNF)-? for 18 h. The expression of surface molecules including HLA-DR, CD86, and CD1a in DCs were detected by flow cytometry, and the expression of signal transducers and activators of transcription (STAT1, 3, 4, 5, 6) and suppressors of cell signaling (SOCS1, 3) were determined by Western blotting assay. In addition, the capacity of DCs to stimulate allogeneic T lymphocytes and the amount of IL-12p70 released from DCs were measured. RESULTS: In the DCs derived from patients with CHB, treatment with TNF-?, CpG-ODNs, or CpG-ODNs/HBsAg, as compared to the vector control, significantly increased the expression of HLA-DR, stimulated the release of IL-12p70, and enhanced the capacity of DCs to stimulate allogenic T lymphocytes. The expressions of STAT1/4/6 and SOCS1/3, but not STAT3/5, were upregulated by TNF-?, CpG-ODNs, and CpG-ODNs/HBsAg. In addition, the expression of CD1a was upregulated only in the presence of both CpG-ODNs and HBsAg. CONCLUSION: The treatment with CpG-ODNs, either alone or combined with HBsAg, has a remarkable stimulatory effect on the impaired phenotype and function of DCs in CHB, possibly by regulating the expression of STAT1, 4, 6 and SOCS1, 3. PMID:22147985

Xiang, Xiao-Xing; Zhou, Xia-Qiu; Wang, Jun-Xue; Xie, Qing; Cai, Xiong; Yu, Hong; Zhou, Hui-Juan

2011-01-01

266

Serglycin is part of the secretory repertoire of LPS-activated monocytes  

PubMed Central

Monocytes play multiple roles in the immune system, and are active in both acute and chronic diseases. Patients exposed to bacterial infections depend on monocytes in defense reactions, but excessive immune reactions may also cause morbidity through systemic inflammatory responses. Few studies have addressed the importance of proteoglycans, and in particular, the hematopoietic serglycin, in such monocyte immune reactions. Adherent primary monocytes were cultured in absence and presence of LPS. Media were analyzed by ELISA for detection of serglycin. Lysed cell fractions were used to determine the mRNA level of serglycin. Monocytes were also cultured on chamber slides to investigate if serglycin could be detected intracellularly by immunocytochemistry. Monocytes secreted serglycin, and LPS-stimulation increased the secretion. Secretion of inflammatory cytokines increased to a larger extent than serglycin. mRNA levels of serglycin were also increased, suggesting both increased expression and secretion. Immunocytochemistry revealed the presence of serglycin in intracellular vesicles, many destined for secretion. Serglycin containing vesicles increased in number and size when the cells were exposed to LPS. Intracellular vesicle localization and secretion of the proteoglycan serglycin is shown for the first time in primary human monocytes. Monocyte activation by LPS increased the expression and secretion of serglycin, suggesting roles for serglycin in inflammatory processes.

Kolseth, Ingrid Benedicte M; Reine, Trine Marita; Vuong, Tram Thu; Meen, Astri Jeanette; Fan, Qiong; Jenssen, Trond Geir; Grønning-Wang, Line Mariann; Kolset, Svein Olav

2015-01-01

267

Quantitative proteomics reveals a role for epigenetic reprogramming during human monocyte differentiation.  

PubMed

The differentiation of monocytes into macrophages and dendritic cells involves mechanisms for activation of the innate immune system in response to inflammatory stimuli, such as pathogen infection and environmental cues. Epigenetic reprogramming is thought to play an important role during monocyte differentiation. Complementary to cell surface markers, the characterization of monocytic cell lineages by mass spectrometry based protein/histone expression profiling opens a new avenue for studying immune cell differentiation. Here, we report the application of mass spectrometry and bioinformatics to identify changes in human monocytes during their differentiation into macrophages and dendritic cells. Our data show that linker histone H1 proteins are significantly down-regulated during monocyte differentiation. Although highly enriched H3K9-methyl/S10-phos/K14-acetyl tri-modification forms of histone H3 were identified in monocytes and macrophages, they were dramatically reduced in dendritic cells. In contrast, histone H4 K16 acetylation was found to be markedly higher in dendritic cells than in monocytes and macrophages. We also found that global hyperacetylation generated by the nonspecific histone deacetylase HDAC inhibitor Apicidin induces monocyte differentiation. Together, our data suggest that specific regulation of inter- and intra-histone modifications including H3 K9 methylation, H3 S10 phosphorylation, H3 K14 acetylation, and H4 K16 acetylation must occur in concert with chromatin remodeling by linker histones for cell cycle progression and differentiation of human myeloid cells into macrophages and dendritic cells. PMID:25316709

Nicholas, Dequina; Tang, Hui; Zhang, Qiongyi; Rudra, Jai; Xu, Feng; Langridge, William; Zhang, Kangling

2015-01-01

268

Monocytic cell differentiation from band-stage neutrophils under inflammatory conditions via MKK6 activation.  

PubMed

During inflammation, neutrophils are rapidly mobilized from the bone marrow storage pool into peripheral blood (PB) to enter lesional sites, where most rapidly undergo apoptosis. Monocytes constitute a second wave of inflammatory immigrates, giving rise to long-lived macrophages and dendritic cell subsets. According to descriptive immunophenotypic and cell culture studies, neutrophils may directly "transdifferentiate" into monocytes/macrophages. We provide mechanistic data in human and murine models supporting the existence of this cellular pathway. First, the inflammatory signal-induced MKK6-p38MAPK cascade activates a monocyte differentiation program in human granulocyte colony-stimulating factor-dependent neutrophils. Second, adoptively transferred neutrophils isolated from G-CSF-pretreated mice rapidly acquired monocyte characteristics in response to inflammatory signals in vivo. Consistently, inflammatory signals led to the recruitment of osteoclast progenitor cell potential from ex vivo-isolated G-CSF-mobilized human blood neutrophils. Monocytic cell differentiation potential was retained in left-shifted band-stage neutrophils but lost in neutrophils from steady-state PB. MKK6-p38MAPK signaling in HL60 model cells led to diminishment of the transcription factor C/EBP?, which enabled the induction of a monocytic cell differentiation program. Gene profiling confirmed lineage conversion from band-stage neutrophils to monocytic cells. Therefore, inflammatory signals relayed by the MKK6-p38MAPK cascade induce monocytic cell differentiation from band-stage neutrophils. PMID:25214442

Köffel, René; Meshcheryakova, Anastasia; Warszawska, Joanna; Hennig, Annika; Wagner, Karin; Jörgl, Almut; Gubi, Daniela; Moser, Doris; Hladik, Anastasiya; Hoffmann, Ulrike; Fischer, Michael B; van den Berg, Wim; Koenders, Marije; Scheinecker, Clemens; Gesslbauer, Bernhard; Knapp, Sylvia; Strobl, Herbert

2014-10-23

269

Decreased monocyte class II MHC expression following major abdominal surgery in children is related to operative stress  

Microsoft Academic Search

Monocyte class II major histocompatibility complex (MHC) expression is necessary for antigen presentation and stimulation\\u000a of T-cells. The aim of this study was to correlate monocyte class II MHC response to operative stress in children and the\\u000a possible influence of cytokines in the postoperative period. We studied 21 children undergoing elective abdominal surgery.\\u000a Operative stress score (OSS) was calculated. Monocyte

M. McHoney; N. J. Klein; S. Eaton; A. Pierro

2006-01-01

270

Benefit from B-Lymphocyte Depletion Using the Anti-CD20 Antibody Rituximab in Chronic Fatigue Syndrome. A Double-Blind and Placebo-Controlled Study  

Microsoft Academic Search

BackgroundChronic fatigue syndrome (CFS) is a disease of unknown aetiology. Major CFS symptom relief during cancer chemotherapy in a patient with synchronous CFS and lymphoma spurred a pilot study of B-lymphocyte depletion using the anti-CD20 antibody Rituximab, which demonstrated significant clinical response in three CFS patients.Methods and FindingsIn this double-blind, placebo-controlled phase II study (NCT00848692), 30 CFS patients were randomised

Øystein Fluge; Ove Bruland; Kristin Risa; Anette Storstein; Einar K. Kristoffersen; Dipak Sapkota; Halvor Næss; Olav Dahl; Harald Nyland; Olav Mella; Markus Reindl

2011-01-01

271

Study on the blood-borne virus co-infection and T lymphocyte subset among intravenous drug users  

PubMed Central

AIM: To investigate the features of various blood-borne virus infections and co-infection in intravenous drug users (IDUs), and to examine the correlation of T lymphocyte subsets with virus co-infection. METHODS: Four hundred and six IDUs without any clinical manifestation of hepatitis and 102 healthy persons were enrolled in this study. HBV-DNA and HCV-RNA were detected by fluorescence quantitative PCR. HBsAg, HBeAg, anti-HBc, anti-HCV, HDV-Ag, anti-HGV, anti-HIV, and HCMV-IgM were assayed by enzyme-linked immunosorbent assay (ELISA) and immunochromatographic tests. The levels of Th1 and Th2 cytokines were measured by ELISA and radioactive immune assay (RIA). The T lymphocyte subpopulation was detected by using fluorescence immunoassay. The similar indices taken from the healthy persons served as controls. RESULTS: The viral infection rate among IDUs was 36.45% for HBV, 69.7% for HCV, 47.3% for HIV, 2.22% for HDV, 1.97% for HGV, and 3.45% for HCMV. The co-infection rate of blood-borne virus was detected in 255 of 406 (62.81%) IDUs. More than 80% (161/192) of subjects infected with HIV were co-infected with the other viruses, such as HBV, HCV. In contrast, among the controls, the infection rate was 17.65% for HBV and 0% for the other viruses. Our investigation showed that there was a profound decrease in the proportion of CD4/CD8 and the percentage of CD3 and CD4, but not in the percentage of CD8. The levels of PHA-induced cytokines (IFN-? and IL-4) and serum IL-2 were obviously decreased in IDUs. On the other hand, the level of serum IL-4 was increased. The level of IFN-? and the percentage of CD4 were continuously decreased when the IDUs were infected with HIV or HIV co-infection. IDUs with HIV and HBV co-infection was 15.1% (29/192). Of those 29 IDU with HIV and HBV co-infection, 51.72% (15/29) and 37.93% (11/29) were HBV-DNA-positive and HBeAg-positive, respectively. But, among IDUs without HIV infection, only 1.68% (2/119) of cases were HBV-DNA-positive. CONCLUSION: HCV, HBV and HIV infections are common in this population of IDU, leading to a high incidence of impaired Th1 cytokine levels and CD4 lymphocyte. IDUs with HIV and HBV/HCV co-infection have lower expression of Th1 cytokine with enhancement of the Th2 response. HIV may be causing HBV replication by decreasing Th1 function. PMID:17511038

Li, Jian-Rong; Gong, Rui-Yu; Tian, Kun-Lun; Wang, Jing; Wang, Yi-Xin; Huang, Han-Ju

2007-01-01

272

Immunomodulating Properties of the Antibiotic Novobiocin in Human Monocytes  

PubMed Central

We show that the coumeromycin antibiotic novobiocin, a potent inhibitor of ADP ribosylation, prevents lipopolysaccharide (LPS)-induced tumor necrosis factor alpha (TNF-?), interleukin-1 (IL-1), IL-6, and IL-10 secretion in human peripheral blood mononuclear cells. It shares these cytokine-suppressing properties with other inhibitors of ADP ribosylation. We found that novobiocin prevents TNF-? production by inhibiting translation of the TNF-? mRNA. Elevated TNF-? levels in mice treated with d-galactosamine (GalN)-LPS or GalN-TNF were not reduced by novobiocin; however, the drug exhibited hepatoprotective properties. Novobiocin causes downregulation of the surface molecules on monocytes, among which CD14 was the most affected. The diminished expression of surface molecules was not observed on T and B lymphocytes. Similar to other inhibitors of ADP ribosylation, novobiocin prevents LPS-induced phosphate labelling of ?-actins. PMID:9687383

Lührmann, Anja; Thölke, Jürgen; Behn, Ingrid; Schumann, Jens; Tiegs, Gisa; Hauschildt, Sunna

1998-01-01

273

The classical CD14 CD16 monocytes, but not the patrolling CD14 CD16 monocytes, promote Th17 responses to Candida albicans  

Microsoft Academic Search

In the present study, we investigated the functional differences between cluster of differentiation (CD)14(++) CD16(-) and CD14(+) CD16(+) monocytes during anti-Candida host defense. CD14(++) CD16(-) are the \\

S. P. Smeekens; F. L. van de Veerdonk; L. A. B. Joosten; L. Jacobs; T. Jansen; D. L. Williams; B. J. Kullberg; M. G. Netea

2011-01-01

274

Apolizumab in Treating Patients With Relapsed or Refractory Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma  

ClinicalTrials.gov

Noncontiguous Stage II Small Lymphocytic Lymphoma; Recurrent Small Lymphocytic Lymphoma; Refractory Chronic Lymphocytic Leukemia; Stage III Small Lymphocytic Lymphoma; Stage IV Small Lymphocytic Lymphoma

2013-07-15

275

Cryopreservation of human monocytes for pharmacopeial monocyte activation test.  

PubMed

EU Directive 2010/63/EU regarding the protection of experimental animals came into force in November 2010 with an obligation for EU member states to incorporate its requirements into their respective national legislations by 1st of January 2013. The directive stipulates the application of in vitro methods to replace animal experiments whenever such an in vitro method exits and is recognized by EU legislation. The monocyte activation test (MAT) for the detection and quantification of pyrogenic contamination in medicines is recognized by the European Directorate for the Quality of Medicines & Health Care (EDQM) and was published in the European Pharmacopeia (Pharm. Eur.) in April 2010. The methodology described here facilitates the use of the MAT by making monocytes available, in the form of cryopreserved human peripheral blood mononuclear cells (PBMCs). We have developed and qualified a procedure to prepare functional monocytes in the form of PBMCs from the leukocyte filters that are used for the separation of blood in blood donation centers. Once used, these filters are normally treated as biological waste. Here we describe the procedures that are critical for the successful cryopreservation of PBMCs, demonstrate protection of PBMC functionality using various ligands for the toll-like receptors (TLRs) that mediate pyrogenic responses, report validation of the methodology for linearity, precision and robustness and show examples of the practical application of cryopreserved in MATs with samples of drugs and vaccines. Another application of cryopreserved PBMCs, only mentioned here, is to serve as an alternative to freshly isolated PBMCs in tests for unwanted intrinsic pro-inflammatory activities of new biological therapeutics. Such tests use PBMCs or PBMCs over a layer of endothelial cells to detect (unwanted) cytokine release, PBMCs being more suited to this purpose than tests using whole blood. PMID:24456627

Koryakina, Anna; Frey, Esther; Bruegger, Peter

2014-03-01

276

Identification of Markers that Distinguish Monocyte-Derived Fibrocytes from Monocytes, Macrophages, and Fibroblasts  

Microsoft Academic Search

BackgroundThe processes that drive fibrotic diseases are complex and include an influx of peripheral blood monocytes that can differentiate into fibroblast-like cells called fibrocytes. Monocytes can also differentiate into other cell types, such as tissue macrophages. The ability to discriminate between monocytes, macrophages, fibrocytes, and fibroblasts in fibrotic lesions could be beneficial in identifying therapies that target either stromal fibroblasts

Darrell Pilling; Ted Fan; Donna Huang; Bhavika Kaul; Richard H. Gomer; Laurent Rénia

2009-01-01

277

CD2 activation of human lamina propria lymphocytes reduces CD3 responsiveness  

PubMed Central

Lamina propria lymphocytes (LPLs) are thought to be antigen-activated memory T cells. Yet, they respond better to ligation of the CD2 receptor than the CD3 receptor by mitogenic antibodies. This study defines their constitutive state of activation and relates it to their CD3 hyporesponsiveness. The activated state of LPLs was demonstrated by their heightened display of the activated CD2 epitope, T113. Constitutive CD2 activation was shown by the reduction in spontaneous proliferation when the CD2–CD58 interaction was blocked. LPLs preferentially recognized CD58 rather than the major histocompatibility complex molecules on monocytes, triggering proliferation and interferon-? (IFN-?) secretion that was inhibited by blocking the CD2–CD58 interaction. To determine whether CD2 activation of LPLs contributes to their CD3 hyporesponsiveness, they were first stimulated with mitogenic CD2 antibodies and then tested for CD3-induced proliferation. The responses were greatly reduced by prior CD2 stimulation compared with LPLs cultured in medium alone. This effect was not caused by apoptosis or by changes in CD3 expression induced by CD2 triggering. This study shows that LPLs are constitutively activated through CD2, that they preferentially recognize CD58 on monocytes and that CD2 stimulation leads to CD3 hyporesponsiveness. PMID:16423042

Ebert, Ellen C

2006-01-01

278

Carboxylesterase 1 (Ces1): from monocyte marker to major player  

Microsoft Academic Search

There are few, if any, enzymes that have been studied by, and have importance in, so many and varied disciplines as has monocyte esterase\\/Ces 1. In this review its involvement in the fields of histochemistry, haematology, toxicology, pharmacology, therapeutics, and tumour cell killing, immune surveillance and malignant disease, is briefly described.

Geraldine M Markey

2010-01-01

279

Treatment of psoriatic arthritis with granulocyte and monocyte adsorption apheresis  

Microsoft Academic Search

Granulocyte and monocyte adsorption apheresis (GCAP) is a new extracorporeal apheresis treatment modality that removes pathogenic granulocytes. Recently, we found that GCAP is useful for treating pyoderma gangrenosum and pustular psoriasis. We thought that this treatment may also be effective for treating other disorders attributable to activated granulocytes and studied the efficacy of GCAP in 4 patients with psoriatic arthritis.

Takuro Kanekura; Hisashi Kawabata; Ikuro Maruyama; Tamotsu Kanzaki

2004-01-01

280

Enhancing the Accuracy of Platelet to Lymphocyte Ratio after Adjustment for Large Platelet Count: A Pilot Study in Breast Cancer Patients  

PubMed Central

Background. The objective of our study is to investigate the potential effect of adjusting preoperative platelet to lymphocyte ratio, an emerging biomarker of survival in cancer patients, for the fraction of large platelets. Methods. A total of 79 patients with breast neoplasias, 44 with fibroadenomas, and 35 with invasive ductal carcinoma were included in the study. Both conventional platelet to lymphocyte ratio (PLR) and the adjusted marker, large platelet to lymphocyte ratio (LPLR), were correlated with laboratory and histopathological parameters of the study sample. Results. LPLR elevation was significantly correlated with the presence of malignancy, advanced tumor stage, metastatic spread in the axillary nodes and HER2/neu overexpression, while PLR was only correlated with the number of infiltrated lymph nodes. Conclusions. This is the first study evaluating the effect of adjustment for large platelet count on improving PLR accuracy, when correlated with the basic independent markers of survival in a sample of breast cancer patients. Further studies are needed in order to assess the possibility of applying our adjustment as standard in terms of predicting survival rates in cancer. PMID:23304480

Seretis, Charalampos; Seretis, Fotios; Lagoudianakis, Emmanuel; Politou, Marianna; Gemenetzis, George; Salemis, Nikolaos S.

2012-01-01

281

Ofatumumab, Pentostatin, and Cyclophosphamide in Treating Patients With Untreated Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma  

ClinicalTrials.gov

Hematopoietic/Lymphoid Cancer; B-cell Chronic Lymphocytic Leukemia; Contiguous Stage II Small Lymphocytic Lymphoma; Noncontiguous Stage II Small Lymphocytic Lymphoma; Stage 0 Chronic Lymphocytic Leukemia; Stage I Chronic Lymphocytic Leukemia; Stage I Small Lymphocytic Lymphoma; Stage II Chronic Lymphocytic Leukemia; Stage III Chronic Lymphocytic Leukemia; Stage III Small Lymphocytic Lymphoma; Stage IV Chronic Lymphocytic Leukemia; Stage IV Small Lymphocytic Lymphoma

2014-10-30

282

PRODUCTS OF ACTIVATED LYMPHOCYTES  

PubMed Central

General methods were developed and applied to the biosynthesis and purification of products of activated lymphocytes available in minute quantities. The activity studied here was the migration inhibitory factor (MIF) produced by purified protein derivative (PPD)- or concanavalin A (Con A)-stimulated lymphocytes obtained from one guinea pig or less. The methods selected yielded results in terms of two chemical parameters characteristic of the molecules involved, namely Kd on Sephadex G-75 and isoionic point, pI, on isoelectric focusing. When supernatants were fractionated on G-75 columns, there were several areas even in control supernatants which produced migration inhibition relative to medium controls. However, in PPD- and Con A-stimulated supernatants, at least one peak of MIF activity was found solely in the stimulated cultures, with a Kd of 0.15. A double-labeling technique was used to characterize the proteins of this peak. Control, unstimulated cultures were labeled with [14C]leucine and stimulated cultures were labeled with [3H]leucine. After mixing the supernatants and G-75 filtration, a major "ratiolabeled" broad peak. i.e. one with increased 3H/14C ratio, was found. When a narrow portion of this peak about Kd 0.15, containing most of the MIF activity, was subjected to analytical isoelectric focusing, all of the label was associated with proteins of lower net charge than albumin. A unique ratiolabeled peak was found in PPD- and Con A-stimulated fractions with a pI of approx. 5.3. A micropreparative isoelectric focusing technique was developed and yielded MIF activity in the same region as the major ratiolabeled peak. Further study will be required to ascertain whether the ratiolabeled protein is MIF. By following the Kd, pI, and 3H/14C labeling ratio, at least 14 products of activated lymphocytes, synthesized either de novo or in increased amounts, could be distinguished. PMID:4688317

Sorg, Clemens; Bloom, Barry R.

1973-01-01

283

Monocyte chemoattractant protein 1 (MCP-1/CCL2) contributes to thymus atrophy in acute myeloid leukemia.  

PubMed

Recent studies on acute myelogenous leukemia (AML) patients have revealed the existence of T-cell immunodeficiencies, characterized by peripheral T lymphocytes that are unable to interact with blasts, reduced thymic emigrants and oligoclonal restricted repertoires. These observations suggest that there is a profound thymic dysregulation, which is difficult to study in AML patients. Using the C1498 AML mouse model, we demonstrated that leukemia development was associated with thymus atrophy, which was defined by abnormal organ weight and reduced cellularity. In addition, we observed a dramatic loss of peripheral CD4(+) and CD8(+) T-cell numbers with increased frequencies of CD4(+) FoxP3(+) regulatory and activated/memory T cells. Investigating the mechanisms leading to this atrophy, we observed a significant accumulation of the monocyte chemoattractant protein 1 (MCP-1/CCL2) in thymi of leukemic mice. Treatment of AML-bearing animals with a blocking anti-CCL2 antibody revealed a lower tumor burden, augmented antileukemic T-cell responses, and improved survival rate compared to nontreated mice. These results were not observed when neutralization of CCL2 was performed in thymectomized mice. Altogether, we show that the CCL2 protein participates in thymic atrophy in AML mice, and this could have important implications for future immunotherapeutic strategies. PMID:25382729

Driss, Virginie; Quesnel, Bruno; Brinster, Carine

2015-02-01

284

[Histological and immunological study of patients with lung and digestive tract tumors. Analysis of T and B lymphocytes from the peripheral blood and from the lymph nodes draining the tumor (author's transl)].  

PubMed

The nature of the immune response to the tumor cell is complex and has yet to be clearly defined. Although past research has foscused on the cytotoxic effect of T lymphocytes versus tumor cells, it has been shown in animal studies that B lymphocytes may also be implicated. Lymphocytes from patients with respiratory and digestive tract tumors were studied. B and T lymphocytes of peripheral blood and of draining lymph node tumors were studied using the following techniques: E rosettes (marker for T cells); membrane Ig, EAC rosettes, aggregated-Ig (marker for B lymphocytes); PHA and PKW in vitro response of lymphocytes using tritiated thymidine incorporation. It was observed that both groups of patients had normal or depressed B and T populations. PHA response was depressed in the majority of the cases with lung tumor. No difference was observed between lymphocytes from peripheral blood and from lymph node suspensions. As in normal lymph nodes the EAC rosettes were constantly observed in the cortical area of lymph node draining tumors. The immune defect observed in part of these cases is discussed in relation to the local and general immunological factors probably responsible for this defect. PMID:1083574

Franchi, F; Colizza, S; D'Amelio, R; Corelli, G; Bigliocchi, S; Indinnimeo, M; Aiuti, F

1975-01-01

285

CD16(+) monocytes with smooth muscle cell characteristics are reduced in human renal chronic transplant dysfunction.  

PubMed

In chronic transplant dysfunction (CTD), persistent (allo)immune-mediated inflammation eventually leads to tissue remodeling including neointima formation in intragraft arteries. We previously showed that recipient-derived neointimal ?-SMA(+) smooth muscle-like cells are present in human renal allografts with CTD. Human PBMC contain myeloid cells capable of differentiating into ?-SMA(+) cells in vitro; the phenotype of the ancestral subset is as yet unknown. This study aimed to investigate whether monocyte subsets contain cells with smooth muscle-like cell differentiation capacity and whether CTD in renal transplant recipients is associated with a shift in these monocyte subsets. To accomplish this goal, monocyte subsets from healthy controls were sorted based on CD14 and CD16 expression to investigate gene expression levels of mesenchymal markers ?-SMA and SM22?. CD14(+)/CD16(++) monocytes displayed increased ?-SMA and SM22? mRNA expression compared with CD14(++)/CD16(-) monocytes, suggesting increased differentiation potential toward smooth muscle-like cells. Flow cytometry revealed that in non-CTD transplant recipients the percentage of CD14(+)/CD16(++) monocytes was reduced, with an even further reduction in patients with CTD. To determine a potential correlation between CD14(+)/CD16(++) monocytes and ?-SMA(+) cell outgrowth potential in vitro, PBMC of healthy controls and transplant recipients with and without CTD were cultured under fibrotic culture conditions, and indeed a significant correlation (p=0.0002, r=0.62) was observed. Finally, double staining for ?-SMA and CD16 revealed presence of ?-SMA(+)CD16(+) cells in kidney explants from CTD patients, albeit at very low numbers. Our data represent evidence that, compared to CD14(++)CD16(-) monocytes, CD14(+)CD16(++) monocytes have an increased expression of smooth muscle cell-associated genes. This monocyte subpopulation is reduced in renal transplant patients with CTD, possibly due to selective migration into the allograft. PMID:25476849

Boersema, M; van den Born, J C; van Ark, J; Harms, G; Seelen, M A; van Dijk, M C R F; van Goor, H; Navis, G J; Popa, E R; Hillebrands, J L

2015-05-01

286

Induction of Monocyte Chemoattractant Protein1 in HIV1 Tat-Stimulated Astrocytes and Elevation in AIDS Dementia  

Microsoft Academic Search

Activated monocytes release a number of substances, including inflammatory cytokines and eicosanoids, that are highly toxic to cells of the central nervous system. Because monocytic infiltration of the central nervous system closely correlates with HIV-1-associated dementia, it has been suggested that monocyte-derived toxins mediate nervous system damage. In the present study, we show that the HIV-1 transactivator protein Tat significantly

Katherine Conant; Alfredo Garzino-Demo; Avindra Nath; Justin C. McArthur; William Halliday; Christopher Power; Robert C. Gallo

1998-01-01

287

Fidelity of SNP Array Genotyping Using Epstein Barr Virus-Transformed B-Lymphocyte Cell Lines: Implications for Genome-Wide Association Studies  

Microsoft Academic Search

BackgroundAs availability of primary cells can be limited for genetic studies of human disease, lymphoblastoid cell lines (LCL) are common sources of genomic DNA. LCL are created in a transformation process that entails in vitro infection of human B-lymphocytes with the Epstein-Barr Virus (EBV).Methodology\\/Principal FindingsTo test for genotypic errors potentially induced by the Epstein-Barr Virus transformation process, we compared single

Joshua T. Herbeck; Geoffrey S. Gottlieb; Kim Wong; Roger Detels; John P. Phair; Charles R. Rinaldo; Lisa P. Jacobson; Joseph B. Margolick; James I. Mullins; Philip Awadalla

2009-01-01

288

Monocyte-to-Macrophage Differentiation  

PubMed Central

Although monocyte- and macrophage-derived molecules are known to promote extracellular matrix (ECM) disruption and destabilization, it is less appreciated that they also synthesize molecules contributing to ECM formation, stabilization, and function. We have identified and characterized the synthesis of proteoglycans and related proteins, some not previously known to be associated with macrophages. Proteoglycan extracts of [35S]sulfate- and 35S-trans amino acid-radiolabeled culture media from THP-1 monocytes induced to differentiate by treatment with phorbol myristate acetate revealed three major proteins of ?25, 90, and 100 kDa following chondroitin ABC lyase digestion. The 25-kDa protein was predominant for monocytes, whereas the 90- and 100-kDa proteins were predominant for macrophages. Tandem mass spectrometry identified (i) the 25-kDa core protein as serglycin, (ii) the 90-kDa core protein as inter-?-inhibitor heavy chain 2 (I?IHC2), and (iii) the 100-kDa core as amyloid precursor-like protein 2 (APLP2). Differentiation was also associated with (i) a >500-fold increase in mRNA for TNF-stimulated gene-6, an essential cofactor for heavy chain-mediated matrix stabilization; (ii) a >800-fold increase in mRNA for HAS2, which is responsible for hyaluronan synthesis; and (iii) a 3-fold increase in mRNA for versican, which interacts with hyaluronan. Biochemical evidence is also presented for an I?IHC2-APLP2 complex, and immunohistochemical staining of human atherosclerotic lesions demonstrates similar staining patterns for APLP2 and I?IHC2 with macrophages, whereas serglycin localizes to the underlying glycosaminoglycan-rich region. These findings indicate that macrophages synthesize many of the molecules participating in ECM formation and function, suggesting a novel role for these molecules in the differentiation of macrophages in the development of atherosclerosis. PMID:22351750

Chang, Mary Y.; Chan, Christina K.; Braun, Kathleen R.; Green, Pattie S.; O'Brien, Kevin D.; Chait, Alan; Day, Anthony J.; Wight, Thomas N.

2012-01-01

289

Comparison of lymphocyte apoptotic index and qualitative DNA damage in yoga practitioners and breast cancer patients: A pilot study  

PubMed Central

Background: Yoga is found to be effective in reducing stress levels and radiation-induced DNA damage, and improving the quality of life, in breast cancer patients. The present study was aimed at comparing the apoptotic index (AI) and DNA damage of advanced yoga practitioners with those of breast cancer patients. Materials and Methods: This cross-sectional pilot study compared three groups (n = 9 each) of age-matched subjects viz. (1) Carcinoma breast patients in stage II or III undergoing radiation therapy after completing three cycles of chemotherapy; (2) Senior yoga practitioners who were practicing asanas, pranayama and meditation daily for more than 10 years; and (3) Normal healthy volunteers. Peripheral blood lymphocytes were isolated, and qualitative DNA damage (QDD) and AI were evaluated by single-cell gel electrophoresis assay. Approximately 500 cells were counted in each case. Number of cells that were normal, undergoing apoptosis, and with DNA damage were categorized and percentages were calculated. Results: Data being normally distributed, one-way analysis of variance (ANOVA) showed significant interaction between groups in AI (P = 0.016) and QDD (P = 0.045). On post-hoc analysis using Scheffe test, AI was significantly lower in non-yoga volunteers as compared with the breast cancer group (P = 0.019) and QDD was significantly lower in yoga practitioners when compared with non-yoga volunteers (P = 0.047). Conclusion: Cellular dysfunction (QDD) requires restorative mechanisms (AI) to restore the system to a balance. The results of this pilot study show trends, which indicate that in ill-health, there is inadequate restorative mechanisms (AI) although dysfunction (QDD) is high. Through regular practice of yoga, cellular dysfunction can be lowered, thus necessitating reduced restorative mechanisms. AI and QDD could also be useful indicators for predicting the three zones of health viz. disease, health, and positive health. PMID:23440089

Ram, Amritanshu; Banerjee, Birendranath; Hosakote, Vadiraja S; Rao, Raghavendra M; Nagarathna, Raghuram

2013-01-01

290

Interaction between human peripheral blood monocytes and tumor promoters: Effect on growth differentiation and function in vitro  

SciTech Connect

Studies on the differentiation and activation of human monocytes in tissue cultures have usually been limited by the deterioration of human monocytes and macrophages in long-term cultures. In this study, we attempted to establish long-term human monocyte/macrophage cultures using the phorbol ester 12-0 tetradecanoyl-phorbol-13-acetate (TPA), and we studied the morphology, function, and biochemical properties of such treated human blood monocytes. Enriched suspensions of monocytes were obtained using Ficoll-Hypaque gradient and cultured in the absence or presence of various concentrations of TPA. Samples were removed at different times and processed for scanning electron microscopy. Parallel samples were examined for numbers of adherent cells, phagocytosis, oxidative burst, beta-galactosidase assays, and lectin-mediated erythrolysis. TPA-treated monocytes survived in larger numbers in culture for up to 7 weeks and were more pleomorphic and exhibited higher beta-galactosidase activities after 14 days in culture than untreated monocytes. TPA-treated cells and untreated cells in long-term cultures showed a decrease in their oxidative burst activity while their phagocytic activity was not affected, and the TPA treatment augmented the lysis of wheat germ agglutinin-opsonized erythrocytes by the cultured monocytes. TPA treatment of adherent human monocytes resulted in cell cultures with increased numbers of viable and functionally adherent cells for extended periods of time and does not seem to interfere with the differentiation and maturation of the cells in culture.

Keisari, Y.; Bucana, C.; Markovich, S.; Campbell, D.E. (Tel Aviv Univ. (Israel))

1990-08-01

291

Myxoma viral serpin, Serp-1, inhibits human monocyte adhesion through regulation of actin-binding protein filamin B.  

PubMed

Serp-1 is a secreted myxoma viral serine protease inhibitor (serpin) with proven, highly effective, anti-inflammatory defensive activity during host cell infection, as well as potent immunomodulatory activity in a wide range of animal disease models. Serp-1 binds urokinase-type plasminogen activator (uPA) and the tissue-type PA, plasmin, and factor Xa, requiring uPA receptor (uPAR) for anti-inflammatory activity. To define Serp-1-mediated effects on inflammatory cell activation, we examined the association of Serp-1 with monocytes and T cells, effects on cellular migration, and the role of uPAR-linked integrins and actin-binding proteins in Serp-1 cellular responses. Our results show that Serp-1 associates directly with activated monocytes and T lymphocytes, in part through interaction with uPAR (P<0.001). Serp-1, but not mammalian serpin PA inhibitor-1 (PAI-1), attenuated cellular adhesion to the extracellular matrix. Serp-1 and PAI-1 reduced human monocyte and T cell adhesion (P<0.001) and migration across endothelial monolayers in vitro (P<0.001) and into mouse ascites in vivo (P<0.001). Serp-1 and an inactive Serp-1 mutant Serp-1(SAA) bound equally to human monocytes and T cells, but a highly proinflammatory mutant, Serp-1(Ala(6)), bound less well to monocytes. Serp-1 treatment of monocytes increased expression of filamin B actin-binding protein and reduced CD18 (beta-integrin) expression (P<0.001) in a uPAR-dependent response. Filamin colocalized and co-immunoprecipitated with uPAR, and short interference RNA knock-down of filamin blocked Serp-1 inhibition of monocyte adhesion. We report here that the highly potent, anti-inflammatory activity of Serp-1 is mediated through modification of uPAR-linked beta-integrin and filamin in monocytes, identifying this interaction as a central regulatory axis for inflammation. PMID:19052145

Viswanathan, Kasinath; Richardson, Jakob; Togonu-Bickersteth, Babajide; Dai, Erbin; Liu, Liying; Vatsya, Pracha; Sun, Yun-ming; Yu, Jeff; Munuswamy-Ramanujam, Ganesh; Baker, Henry; Lucas, Alexandra R

2009-03-01

292

Serum amyloid A chemoattracts immature dendritic cells and indirectly provokes monocyte chemotaxis by induction of cooperating CC and CXC chemokines.  

PubMed

Serum amyloid A (SAA) is an acute phase protein that is upregulated in inflammatory diseases and chemoattracts monocytes, lymphocytes, and granulocytes via its G protein-coupled receptor formyl peptide receptor like 1/formyl peptide receptor 2 (FPRL1/FPR2). Here, we demonstrated that the SAA1? isoform also chemoattracts monocyte-derived immature dendritic cells (DCs) in the Boyden and ?-slide chemotaxis assay and that its chemotactic activity for monocytes and DCs was indirectly mediated via rapid chemokine induction. Indeed, SAA1 induced significant amounts (?5 ng/mL) of macrophage inflammatory protein-1?/CC chemokine ligand 3 (MIP-1?/CCL3) and interleukin-8/CXC chemokine ligand 8 (IL-8/CXCL8) in monocytes and DCs in a dose-dependent manner within 3 h. However, SAA1 also directly activated monocytes and DCs for signaling and chemotaxis without chemokine interference. SAA1-induced monocyte migration was nevertheless significantly prevented (60-80% inhibition) in the constant presence of desensitizing exogenous MIP-1?/CCL3, neutralizing anti-MIP-1?/CCL3 antibody, or a combination of CC chemokine receptor 1 (CCR1) and CCR5 antagonists, indicating that this endogenously produced CC chemokine was indirectly contributing to SAA1-mediated chemotaxis. Further, anti-IL-8/CXCL8 antibody neutralized SAA1-induced monocyte migration, suggesting that endogenous IL-8/CXCL8 acted in concert with MIP-1?/CCL3. This explained why SAA1 failed to synergize with exogenously added MIP-1?/CCL3 or stromal cell-derived factor-1? (SDF-1?)/CXCL12 in monocyte and DC chemotaxis. In addition to direct leukocyte activation, SAA1 induces a chemotactic cascade mediated by expression of cooperating chemokines to prolong leukocyte recruitment to the inflammatory site. PMID:25345597

Gouwy, Mieke; De Buck, Mieke; Pörtner, Noëmie; Opdenakker, Ghislain; Proost, Paul; Struyf, Sofie; Van Damme, Jo

2015-01-01

293

Ofatumumab added to dexamethasone in patients with relapsed or refractory chronic lymphocytic leukemia: Results from a phase II study.  

PubMed

The treatment of relapsed/refractory chronic lymphocytic leukemia (CLL) remains a challenging clinical issue. An important treatment option is the use of high-dose corticosteroids. The purpose of this clinical trial was to determine the efficacy and toxicity of an ofatumumab-dexamethasone (O-Dex) combination in relapsed or refractory CLL. The trial was an open-label, multicenter, nonrandomized, Phase II study. The O-Dex regimen consisted of intravenous ofatumumab (Cycle 1: 300 mg on day 1, 2,000 mg on days 8, 15, and 22; Cycles 2-6: 1,000 mg on days 1, 8, 15, and 22) and oral dexamethasone (40 mg on days 1-4 and 15-18; Cycles 1-6). The O-Dex regimen was given until best response, or a maximum of six cycles. Thirty-three patients (pts) were recruited. Twenty-four (73%) pts completed at least three cycles of therapy. The remaining nine pts were prematurely discontinued owing to Grade 3/4 infections (seven pts), disease progression (one pt), or uncontrollable diabetes mellitus (one pt). Overall response rates/complete remissions (ORR/CR) were achieved in 22/5 pts (67/15%). The median progression-free survival (PFS) was 10 months. In pts with p53 defects (n?=?8), ORR/CR were achieved in 5/2 pts (63/25%) with a median PFS of 10.5 months. The median overall survival (OS) was 34 months. The Grades 3-5 infectious toxicity in 33% of pts represented the most frequent side effect during the treatment period. In conclusion, the O-Dex regimen shows a relatively high ORR and CR with promising findings for PFS and OS. The study was registered at www.clinicaltrials.gov (NCT01310101). Am. J. Hematol. 90:417-421, 2015. © 2015 Wiley Periodicals, Inc. PMID:25645263

Doubek, Michael; Brychtova, Yvona; Panovska, Anna; Sebejova, Ludmila; Stehlikova, Olga; Chovancova, Jana; Malcikova, Jitka; Smardova, Jana; Plevova, Karla; Volfova, Pavlina; Trbusek, Martin; Mraz, Marek; Bakesova, Denisa; Trizuljak, Jakub; Hadrabova, Marketa; Obrtlikova, Petra; Karban, Josef; Smolej, Lukas; Oltova, Alexandra; Jelinkova, Eva; Pospisilova, Sarka; Mayer, Jiri

2015-05-01

294

A study of dendritic cell and MHC class II expression in dogs with immunomodulatory-responsive lymphocytic-plasmacytic pododermatitis.  

PubMed

The term immunomodulatory-responsive lymphocytic-plasmacytic pododermatitis (ImR-LPP) has previously been proposed to denote a sub-population of dogs with idiopathic pododermatitis. The objective of this study was to investigate dendritic cell (DC) and MHC class II antigen expression in lesional skin of dogs with ImR-LPP (n=47). Median epidermal CD1c(+) cell counts were 37.8 and 12.5 mm(-1) in ImR-LPP dogs and healthy controls (n=27), respectively (P<0.01), while the corresponding dermal cell counts were 180.9 and 45.0 mm(-2), respectively (P<0.01). Intra-epidermal clusters of DCs were observed in 18/47 dogs with ImR-LPP. Median epidermal MHC class II(+) cell counts were 32.5 and 10.5 mm(-1) in ImR-LPP dogs and healthy controls, respectively (P<0.01), while the corresponding dermal cell counts were 216.9 and 46.9 mm(-2), respectively (P<0.01). Dermal MHC class II(+) staining was primarily associated with DCs (47/47 dogs), mononuclear inflammatory cells (45/47), fibroblast-like cells (19/47) and vascular endothelium (14/47). The DC hyperplasia and increased MHC class II expression in lesional ImR-LPP skin are consistent with enhanced antigen presentation, and suggest that both parameters may contribute to the pathogenesis of ImR-LPP through the priming and activation of CD4(+) T cells. Equally, it is possible that the enhanced DC numbers observed in this study may contribute to the immunoregulation of steady-state pathology in lesional ImR-LPP skin through additional expanded, although as yet unresolved, mechanisms. PMID:17804263

Breathnach, Rory M; Fanning, Shay; Mulcahy, Grace; Bassett, Hugh F; Jones, Boyd R

2008-09-01

295

Extracellular adenosine triphosphate increases cation permeability of chronic lymphocytic leukemic lymphocytes  

SciTech Connect

Extracellular adenosine triphosphate (ATP) is known to reversibly increase the cation permeability of a variety of freshly isolated and cultured cell types. In this study the effects of extracellular ATP were studied using peripheral blood lymphocytes (PBL) isolated from both normal subjects and from patients with chronic lymphocytic leukemia (CLL). Changes in the permeability to Na+, Rb+, and Li+ ions were measured using conventional isotope and flame photometry techniques. In addition, changes in cytosolic (Ca2+) were fluorimetrically monitored to assess possible changes in net Ca2+ influx. ATP produced a 12-fold increase in 22Na+ influx into CLL cells but only a 3.5-fold increase in this flux in PBL cells. A maximal response was produced by 0.1 mmol/L ATP in the absence of Mg2+, while a twofold molar excess of Mg2+ over ATP abolished the response. ATP had no effect on the passive (ouabain-insensitive) 86Rb+ influx into PBL cells but stimulated this flux by fivefold in the CLL cells. Li+ influx into CLL cells was also stimulated threefold by ATP. Under these same conditions ATP also produced a net increase in total cell Na and a decrease in total cell K in the CLL cells. Exclusion of two normally impermeable dyes, trypan blue and ethidium bromide, was not altered in the ATP-treated CLL cells. Finally, extracellular ATP (3 mmol/L) produced no significant change in the cytosolic (Ca2+) of normal, monocyte-depleted populations of PBL. Conversely, this same concentration of ATP produced a very rapid and a significant (an average threefold peak change) increase in the cytosolic (Ca2+) of cell preparations derived from five out of nine CLL patients. In these latter CLL cells, the ATP-induced elevation in cytosolic (Ca2+) appeared to be due to a net increase in Ca2+ influx, since no elevations were observed when the extracellular (Ca2+) was reduced to less than 0.1 mmol/L.

Wiley, J.S.; Dubyak, G.R.

1989-04-01

296

Monocytes/macrophages express chemokine receptor CCR9 in rheumatoid arthritis and CCL25 stimulates their differentiation  

PubMed Central

Introduction Monocytes/macrophages accumulate in the rheumatoid (RA) synovium where they play a central role in inflammation and joint destruction. Identification of molecules involved in their accumulation and differentiation is important to inform therapeutic strategies. This study investigated the expression and function of chemokine receptor CCR9 in the peripheral blood (PB) and synovium of RA, non-RA patients and healthy volunteers. Methods CCR9 expression on PB monocytes/macrophages was analysed by flow cytometry and in synovium by immunofluorescence. Chemokine receptor CCR9 mRNA expression was examined in RA and non-RA synovium, monocytes/macrophages from PB and synovial fluid (SF) of RA patients and PB of healthy donors using the reverse transcription polymerase chain reaction (RT-PCR). Monocyte differentiation and chemotaxis to chemokine ligand 25 (CCL25)/TECK were used to study CCR9 function. Results CCR9 was expressed by PB monocytes/macrophages in RA and healthy donors, and increased in RA. In RA and non-RA synovia, CCR9 co-localised with cluster of differentiation 14+ (CD14+) and cluster of differentiation 68+ (CD68+) macrophages, and was more abundant in RA synovium. CCR9 mRNA was detected in the synovia of all RA patients and in some non-RA controls, and monocytes/macrophages from PB and SF of RA and healthy controls. CCL25 was detected in RA and non-RA synovia where it co-localised with CD14+ and CD68+ cells. Tumour necrosis factor alpha (TNF?) increased CCR9 expression on human acute monocytic leukemia cell line THP-1 monocytic cells. CCL25 induced a stronger monocyte differentiation in RA compared to healthy donors. CCL25 induced significant chemotaxis of PB monocytes but not consistently among individuals. Conclusions CCR9 expression by monocytes is increased in RA. CCL25 may be involved in the differentiation of monocytes to macrophages particularly in RA. PMID:20738854

2010-01-01

297

Original article Comparative analysis of canine monocyte-  

E-print Network

morphology that expressed CD1c, CD11c and CD14, similar to macrophages. However, CD40 was only found on DCOriginal article Comparative analysis of canine monocyte- and bone-marrow-derived dendritic cells capacity. DC were derived from monocytes (MoDC) and from bone marrow hematopoietic cells cultured

Boyer, Edmond

298

Elevation of monocyte chemoattractant protein-1 in patients experiencing neurocognitive decline following carotid endarterectomy  

Microsoft Academic Search

Summary  \\u000a Background. Previous studies have demonstrated that elevated pre-operative monocyte count is an independent predictor of acute neurocognitive\\u000a decline following carotid endarterectomy (CEA). Monocyte chemoattractant protein-1 (MCP-1), secreted by human endothelial\\u000a and monocyte-like cells, is a potent mediator of inflammation and mononuclear cell trafficking. This study examines the relationship\\u000a between peri-operative serum MCP-1 elevation and post-operative neurocognitive injury following CEA.

W. J. Mack; A. F. Ducruet; Z. L. Hickman; J. Zurica; R. M. Starke; M. C. Garrett; R. J. Komotar; D. O. Quest; R. A. Solomon; E. J. Heyer; E. Sander Connolly

2008-01-01

299

Response of lymphocytes to a mitogenic stimulus during spaceflight  

NASA Technical Reports Server (NTRS)

Several studies were performed that demonstrate that immunological activities of lymphocytes can be affected by spaceflight or by models that attempt to simulate some aspects of weightlessness. Included among these are the responses of lymphocytes to external stimuli such as mitogens and viruses. When cultures of lymphocytes were flown in space, the ability of the lymphocytes to respond to mitogens was inhibited. Similar results were obtained when lymphocytes from astronauts or animals just returned from space were placed into culture immediately upon return to earth, and when models of hypogravity were used. Lymphocytes placed in culture during spaceflights produced enhanced levels of interferon compared to control cultures. When cultures of lymphocytes were prepared for cosmonauts or rodents immediately upon return to earth, interferon production was inhibited. These results suggest that space flight can have profound effects on lymphocyte function, and that effects on isolated cells may be different from that on cells in the whole organism.

Sonnenfeld, Gerald

1989-01-01

300

Prognostic value of phagocytic activity of neutrophils and monocytes in sepsis. Correlation to CD64 and CD14 antigen expression  

PubMed Central

The role of the phagocytic function of monocytes and neutrophils in sepsis has been poorly investigated. The present study evaluated the impact of the phagocytic activity of neutrophils and monocytes on the outcome of patients with severe sepsis. Thirty-one patients and 30 healthy individuals were enrolled in the study. The phagocytic activity of monocytes and neutrophils was evaluated during 24 h after admission and the results were correlated to the expression of CD64 on neutrophils and monocytes, CD14 antigen on monocytes, the Simplified Acute Physiology Score II and the patients' survival. A reduced phagocytic activity of neutrophils during the first 24 h after admission was a negative predictor for survival. Increased expression of CD64 antigen on polymorphonuclear cells (PMNs) and monocytes was favourably correlated to the patients' survival. In multivariate analysis the phagocytic activity of PMNs was the only independent predictor factor for survival. Patients with PMN phagocytic activity <37% had lower expression of CD64 on monocytes and PMNs and worse outcome, while those with phagocytic activity >37% had higher expression of CD64 on monocytes and PMNs and better outcome. Reduced phagocytic activity of neutrophils may represent a state of neutrophil inactivation similar to that previously described for monocytes during the compensatory anti-inflammatory response. PMID:18727624

Danikas, D D; Karakantza, M; Theodorou, G L; Sakellaropoulos, G C; Gogos, C A

2008-01-01

301

Monocyte procoagulant activity in glomerulonephritis associated with systemic lupus erythematosus.  

PubMed Central

Monocyte infiltration and activation of the coagulation system have been implicated in the pathophysiology of glomerulonephritis. In this study, spontaneous procoagulant activity (PCA) was measured in circulating mononuclear cells to determine whether elevated PCA correlated with the presence of proliferative glomerulonephritis in patients with systemic lupus erythematosus (SLE). No increase in PCA was found in 20 patients with end-stage renal failure, 8 patients with glomerulonephritis without SLE, and 10 patients undergoing abdominal surgical or orthopedic procedures as compared with 20 normal controls. In eight patients with SLE but with no apparent active renal disease, PCA was not elevated above normal basal levels. Seven additional patients with SLE who had only mesangial proliferation on biopsy also had no increase in PCA. In contrast, eight patients with focal or diffuse proliferative lupus nephritis, and one patient with membranous nephritis who ultimately developed a proliferative lesion, had a marked increase in PCA with greater than 100 times the base-line levels. The activity was shown to originate in the monocyte fraction of the mononuclear cells and was shown to be capable of cleaving prothrombin directly. The prothrombinase activity was not Factor Xa, because it was not neutralized by anti-Factor X serum and was not inhibited by an established panel of Factor Xa inhibitors. Monocyte plasminogen activator determinations did not correlate with renal disease activity. We conclude that monocyte procoagulant activity, a direct prothrombinase, seems to correlate with endocapillary proliferation in lupus nephritis and could be a mediator of tissue injury. Images PMID:4038982

Cole, E H; Schulman, J; Urowitz, M; Keystone, E; Williams, C; Levy, G A

1985-01-01

302

Human B lymphocytes show greater susceptibility to H2O2 toxicity than T lymphocytes.  

PubMed

Lymphocytes from patients with chronic lymphocytic leukemia (CLL) and from normal subjects were incubated with a glucose-glucose oxidase hydrogen peroxide (H2O2) generating system to study the effect of oxidant stress on these cells. Within 4 hr, 90% of normal but only 21% of CLL lymphocytes remained viable. When normal and CLL preparations enriched in B or T cells were exposed to H2O2, B lymphocytes from both groups were highly susceptible to oxidative damage while T lymphocytes were relatively resistant. The H2O2 scavenger catalase prevented the cytotoxicity. The present work identifies the human B lymphocyte as a cell that should be a suitable target for selective killing by H2O2-generating systems. PMID:6609202

Farber, C M; Liebes, L F; Kanganis, D N; Silber, R

1984-05-01

303

Dialysable lymphocyte extract (DLyE) in infantile onset autism: A pilot study  

Microsoft Academic Search

40 infantile autistic patients were studied. They ranged from 6 years to 15 years of age at entry. 22 were cases of classical\\u000a infantile autism; whereas 18 lacked one or more clinical defects associated with infantile autism (“pseudoautism”). Of the\\u000a 22 with classic autism, 21 responded to transfer factor (TF) treatment by gaining at least 2 points in symptoms severity

H. H. Fudenberg

1996-01-01

304

In Vivo Imaging Reveals a Pioneer Wave of Monocyte Recruitment into Mouse Skin Wounds  

PubMed Central

The cells of the mononuclear phagocyte system are essential for the correct healing of adult skin wounds, but their specific functions remain ill-defined. The absence of granulation tissue immediately after skin injury makes it challenging to study the role of mononuclear phagocytes at the initiation of this inflammatory stage. To study their recruitment and migratory behavior within the wound bed, we developed a new model for real-time in vivo imaging of the wound, using transgenic mice that express green and cyan fluorescent proteins and specifically target monocytes. Within hours after the scalp injury, monocytes invaded the wound bed. The complete abrogation of this infiltration in monocyte-deficient CCR2?/? mice argues for the involvement of classical monocytes in this process. Monocyte infiltration unexpectedly occurred as early as neutrophil recruitment did and resulted from active release from the bloodstream toward the matrix through microhemorrhages rather than transendothelial migration. Monocytes randomly scouted around the wound bed, progressively slowed down, and stopped. Our approach identified and characterized a rapid and earlier than expected wave of monocyte infiltration and provides a novel framework for investigating the role of these cells during early stages of wound healing. PMID:25272047

Rodero, Mathieu P.; Licata, Fabrice; Poupel, Lucie; Hamon, Pauline; Khosrotehrani, Kiarash; Combadiere, Christophe; Boissonnas, Alexandre

2014-01-01

305

Tumoricidal activity of human monocytes activated in vitro by free and liposome-encapsulated human lymphokines.  

PubMed Central

Human peripheral blood mononuclear cells from normal donors obtained by separation on a Percoll gradient were incubated with free or liposome-entrapped lymphokines produced from concanavalin A-stimulated lymphocytes and then were tested for cytotoxic activity against tumor cells. The treated monocytes lysed tumorigenic melanoma and glioblastoma target cells, but had no effect on three types of nontumorigenic target cells. The activation of monocytes to become tumoricidal was caused by macrophage-activating factor (MAF) and not by contamination with endotoxins, concanavalin A, or interferon. The endocytosis of liposomes containing MAF, but not of those containing control supernatants, led to the activation of cytotoxic properties in the monocytes. Activation by liposome-encapsulated MAF was very efficient and required less than 1/800th of the amount of free MAF necessary to achieve the same levels of cytotoxicity. Thus, the encapsulation of mitogen-induced MAF in liposomes could provide an effective approach for the activation of blood monocytes in situ. Images FIGURE 2 PMID:6348087

Kleinerman, E S; Schroit, A J; Fogler, W E; Fidler, I J

1983-01-01

306

Alcohol-Induced miR-27a Regulates Differentiation and M2 Macrophage Polarization of Normal Human Monocytes.  

PubMed

Alcohol abuse is a leading cause of liver disease characterized by liver inflammation, fatty liver, alcoholic hepatitis, or liver cirrhosis. Immunomodulatory effects of alcohol on monocytes and macrophages contribute to alcoholic liver disease. Alcohol use, an independent risk factor for progression of hepatitis C virus (HCV) infection-mediated liver disease, impairs host defense and alters cytokine production and monocyte/macrophage activation. We hypothesized that alcohol and HCV have synergistic effects on the phenotype and function of monocytes. Our data show that acute alcohol binge drinking in healthy volunteers results in increased frequency of CD16(+) and CD68(+) and M2-type (CD206(+), dendritic cell [DC]-SIGN(+)-expressing and IL-10-secreting) circulating CD14(+) monocytes. Expression of HCV-induced CD68 and M2 markers (CD206 and DC-SIGN) in normal monocytes was further enhanced in the presence of alcohol. The levels of microRNA (miR)-27a was significantly upregulated in monocytes cultured in the presence of alcohol or alcohol and HCV as compared with HCV alone. The functional role of miR-27a in macrophage polarization was demonstrated by transfecting monocytes with an miR-27a inhibitor that resulted in reduced alcohol- and HCV- mediated monocyte activation (CD14 and CD68 expression), polarization (CD206 and DC-SIGN expression), and IL-10 secretion. Overexpression of miR-27a in monocytes enhanced IL-10 secretion via activation of the ERK signaling pathway. We found that miR-27a promoted ERK phosphorylation by downregulating the expression of ERK inhibitor sprouty2 in monocytes. Thus, we identified that sprouty2 is a target of miR-27a in human monocytes. In summary, our study demonstrates the regulatory role of miR-27a in alcohol-induced monocyte activation and polarization. PMID:25716995

Saha, Banishree; Bruneau, Johanna C; Kodys, Karen; Szabo, Gyongyi

2015-04-01

307

Preliminary studies of the effects of psychological stress on circulating lymphocytes analyzed by synchrotron radiation based-Fourier transform infrared microspectroscopy.  

PubMed

Psychological stress is a condition that not only generates behavioral disorders but also disrupts homeostasis and immune activity that can exacerbate or lead to inflammatory diseases. The aim of this work was to study biochemical changes in circulating immune cells from rats under psychological stress by using vibrational spectroscopy. A stress model was used, where exposure to a stressor was repeated for 5 days. Subsequently, circulating lymphocytes were examined for their biomolecular vibrational fingerprints with synchrotron radiation based-Fourier transform infrared microspectroscopy. The results showed an increased absorption at the ester lipid region (1720-1755 cm(-1)) in lymphocytes from stressed rats, suggesting lipid peroxidation. Statistical significant changes in wavenumber peak position and absorbance in the nucleic acid region were also observed (915-950 cm(-1) Z-DNA, 1090-1150 cm(-1) symmetric stretching of P-O-C, 1200-1260 cm(-1) asymmetric PO2 and 1570-1510 cm(-1) methylated nucleotides) which suggest a reduction of transcriptional activity in lymphocytes from stressed rat. These results unravel part of the mechanisms by which psychological stress may affect the immune system leading to systemic consequences. PMID:24667417

Vargas-Caraveo, Alejandra; Castillo-Michel, Hiram; Mejia-Carmona, Gloria Erika; Pérez-Ishiwara, David Guillermo; Cotte, Marine; Martínez-Martínez, Alejandro

2014-07-15

308

Kinetics of Th1/Th2 cytokines and lymphocyte subsets to predict chronic GVHD after allo-SCT: results of a prospective study.  

PubMed

The role of different cytokines and cells of immune system in the pathogenesis of chronic GVHD (cGVHD) is still controversial. Earlier studies, which were either retrospective or analysed one or a few factors, did not show unequivocal results. We prospectively evaluated cytokine levels and lymphocyte subsets in 30 patients who underwent Allo-SCT to investigate their possible correlation with cGVHD. Levels of IL-4, IL-6, IL-10, IFN-gamma, tumour necrosis factor-alpha (TNF-alpha) and its soluble receptors were assessed by ELISA in 30 patients at different times after SCT. Lymphocyte subsets were evaluated by flow cytometry in peripheral blood at the same times as cytokines. A multivariate analysis was performed using principal component analysis and multi-factor ANOVA (analysis of variance). Eighteen patients developed cGVHD at a median time of 6 months (range, 5-9) after SCT. In multivariate analysis, we observed a correlation between cGVHD and clusters of cytokines and lymphocyte subsets from the third to the sixth month after SCT. These clusters changed their composition over time, but they constantly included natural killer (NK) and CD152+ T cells as negative predictors of cGVHD. TNF-alpha prevailed among other cytokines before the onset of cGVHD. This prevalence could be related partly to the defect of immunoregulatory cells. PMID:19398965

Skert, C; Damiani, D; Michelutti, A; Patriarca, F; Arpinati, M; Filì, C; Lucchi, P; Malagola, M; Bergonzi, C; Roccaro, A; Peli, A; Ricotta, D; Caimi, L; Fanin, R; Baccarani, M; Russo, D

2009-12-01

309

Preliminary studies of the effects of psychological stress on circulating lymphocytes analyzed by synchrotron radiation based-Fourier transform infrared microspectroscopy  

NASA Astrophysics Data System (ADS)

Psychological stress is a condition that not only generates behavioral disorders but also disrupts homeostasis and immune activity that can exacerbate or lead to inflammatory diseases. The aim of this work was to study biochemical changes in circulating immune cells from rats under psychological stress by using vibrational spectroscopy. A stress model was used, where exposure to a stressor was repeated for 5 days. Subsequently, circulating lymphocytes were examined for their biomolecular vibrational fingerprints with synchrotron radiation based-Fourier transform infrared microspectroscopy. The results showed an increased absorption at the ester lipid region (1720-1755 cm-1) in lymphocytes from stressed rats, suggesting lipid peroxidation. Statistical significant changes in wavenumber peak position and absorbance in the nucleic acid region were also observed (915-950 cm-1 Z-DNA, 1090-1150 cm-1 symmetric stretching of Psbnd Osbnd C, 1200-1260 cm-1 asymmetric PO2 and 1570-1510 cm-1 methylated nucleotides) which suggest a reduction of transcriptional activity in lymphocytes from stressed rat. These results unravel part of the mechanisms by which psychological stress may affect the immune system leading to systemic consequences.

Vargas-Caraveo, Alejandra; Castillo-Michel, Hiram; Mejia-Carmona, Gloria Erika; Pérez-Ishiwara, David Guillermo; Cotte, Marine; Martínez-Martínez, Alejandro

2014-07-01

310

Lenalidomide and Vaccine Therapy in Treating Patients With Early-Stage Asymptomatic Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma  

ClinicalTrials.gov

Chronic Lymphocytic Leukemia; Stage 0 Chronic Lymphocytic Leukemia; Stage I Chronic Lymphocytic Leukemia; Stage I Small Lymphocytic Lymphoma; Stage II Chronic Lymphocytic Leukemia; Stage II Small Lymphocytic Lymphoma

2015-03-02

311

Characterization of IL-4 receptor components expressed on monocytes and monocyte-derived macrophages: variation associated with differential signaling by IL-4.  

PubMed

The anti-inflammatory effects of IL-4 on activated monocytes differ from those on monocyte-derived macrophages (MDMac). While IL-4 suppresses LPS-induced IL-1beta , IL-12, IL-10 and TNFalpha production by monocytes, IL-4 suppresses only IL-1beta and IL-12 production by MDMac. The U937 and Mono Mac 6 cell lines have similar cytokine responses to IL-4 as monocytes and MDMac, respectively. The IL-4Ralpha and IL-2Rgamma (gammac) chains are well-characterized components of the IL-4 receptor. Cross-linking studies with 125I-IL-4 revealed that for monocytes and U937 cells, the binding of IL-4 to the receptor components was approximately 1:1 for IL-4Ralpha:gammac. In contrast, for MDMac and Mono Mac 6 cells that have a relative reduction in gammac surface expression, the binding of IL-4 to IL-4Ralpha:gammac was approximately 3:1. Furthermore, IL-4 induced IL-4Ralpha chain phosphorylation more rapidly in MDMac and Mono Mac 6 cells than in monocytes and U937 cells. This study identifies a correlation between altered 125I-IL-4 cross-linking to IL-4Ralpha:gammac, IL-4-induced signaling and regulation of pro-inflammatory cytokine production by IL-4. PMID:11811777

Bonder, C S; Hart, P H; Davies, K V; Burkly, L C; Finlay-Jones, J J; Woodcock, J M

2001-01-01

312

Alvocidib in Treating Patients With B-Cell Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma  

ClinicalTrials.gov

B-cell Chronic Lymphocytic Leukemia; Contiguous Stage II Small Lymphocytic Lymphoma; Noncontiguous Stage II Small Lymphocytic Lymphoma; Stage I Chronic Lymphocytic Leukemia; Stage I Small Lymphocytic Lymphoma; Stage II Chronic Lymphocytic Leukemia; Stage III Chronic Lymphocytic Leukemia; Stage III Small Lymphocytic Lymphoma; Stage IV Chronic Lymphocytic Leukemia; Stage IV Small Lymphocytic Lymphoma

2013-07-01

313

Detection and quantification methods of monocyte homing in coronary vasculature with an imaging cryomicrotome.  

PubMed

Cellular imaging modalities are important for revealing the behavior and role of monocytes in response to neovascularization progression in coronary artery disease. In this study we aimed to develop methods for high-resolution three-dimensional (3D) imaging and quantification of monocytes relative to the entire coronary artery network using a novel episcopic imaging modality. In a series of ex vivo experiments, human umbilical vein endothelial cells and CD14+ monocytes were labeled with fluorescent live cell tracker probes and infused into the coronary artery network of excised rat hearts by a Langendorff perfusion method. Coronary arteries were subsequently infused with fluorescent vascular cast material and processed with an imaging cryomicrotome, whereby each heart was consecutively cut (5 ?m slice thickness) and block face imaged at appropriate excitation and emission wavelengths. The resulting image stacks yielded 3D reconstructions of the vascular network and the location of cells administered. Successful detection and quantification of single cells and cell clusters were achieved relative to the coronary network using customized particle detection software. These methods were then applied to an in vivo rabbit model of chronic myocardial ischemia in which autologous monocytes were isolated from peripheral blood, labeled with a fluorescent live cell tracker probe and re-infused into the host animal. The processed 3D image stacks revealed homing of monocytes to the ischemic myocardial tissue. Monocytes detected in the ischemic tissue were predominantly concentrated in the mid-myocardium. Vessel segmentation identified coronary collateral connections relative to monocyte localization. This study established a novel imaging platform to efficiently determine the localization of monocytes in relation to the coronary microvascular network. These techniques are invaluable for investigating the role of monocyte populations in the progression of coronary neovascularization in animal models of chronic and sub-acute myocardial ischemia. PMID:25179912

Hakimzadeh, Nazanin; van Horssen, Pepijn; van Lier, Monique G J T B; van den Wijngaard, Jeroen P H M; Belterman, Charly; Coronel, Ruben; Piek, Jan J; Verberne, Hein J; Spaan, Jos A E; Siebes, Maria

2014-11-01

314

FSH-Receptor Isoforms and FSH-dependent Gene Transcription in Human Monocytes and Osteoclasts  

PubMed Central

Cells of the monocyte series respond to follicle stimulating hormone (FSH) by poorly characterized mechanisms. We studied FSH-receptors (FSH-R) and FSH response in nontransformed human monocytes and in osteoclasts differentiated from these cells. Western blot and PCR confirmed FSH-R expression on monocytes or osteoclasts, although at low levels relative to ovarian controls. Monocyte and osteoclast FSH-Rs differed from FSH-R from ovarian cells, reflecting variable splicing in exons 8–10. Monocytes produced no cAMP, the major signal in ovarian cells, in response to FSH. However, monocytes or osteoclasts transcribed TNF? in response to the FSH. No relation of expression of osteoclast FSH-R to the sex of cell donors or to exposure to sex hormones was apparent. Controls for FSH purity and endotoxin contamination were negative. Unamplified cRNA screening in adherent CD14 cells after 2 hours in 25 ng/ml FSH showed increased transcription of RANKL signalling proteins. Transcription of key proteins that stimulate bone turnover, TNF? and TSG-6, increased 2–3 fold after FSH treatment. Smaller but significant changes occurred in transcripts of selected signalling, adhesion, and cytoskeletal proteins. We conclude that monocyte and osteoclast FSH response diverges from that of ovarian cells, reflecting, at least in part, varying FSH-R isoforms. PMID:20171950

Robinson, Lisa J; Tourkova, Irina; Wang, Yujuan; Sharrow, Allison C; Landau, Michael S; Yaroslavskiy, Beatrice B; Li, Sun; Zaidi, Mone; Blair, Harry C

2010-01-01

315

Monocyte cell surface glycosaminoglycans positively modulate IL-4-induced differentiation toward dendritic cells.  

PubMed

IL-4 induces the differentiation of monocytes toward dendritic cells (DCs). The activity of many cytokines is modulated by glycosaminoglycans (GAGs). In this study, we explored the effect of GAGs on the IL-4-induced differentiation of monocytes toward DCs. IL-4 dose-dependently up-regulated the expression of DC-specific ICAM-3-grabbing nonintegrin (DC-SIGN), CD80, CD206, and CD1a. Monocytes stained positive with Abs against heparan sulfate (HS) and chondroitin sulfate (CS) B (CSB; dermatan sulfate), but not with Abs that recognize CSA, CSC, and CSE. Inhibition of sulfation of monocyte/DC cell surface GAGs by sodium chlorate reduced the reactivity of sulfate-recognizing single-chain Abs. This correlated with hampered IL-4-induced DC differentiation as evidenced by lower expression of DC-SIGN and CD1a and a decreased DC-induced PBL proliferation, suggesting that sulfated monocyte cell surface GAGs support IL-4 activity. Furthermore, removal of cell surface chondroitin sulfates by chondroitinase ABC strongly impaired IL-4-induced STAT6 phosphorylation, whereas removal of HS by heparinase III had only a weak inhibitory effect. IL-4 bound to heparin and CSB, but not to HS, CSA, CSC, CSD, and CSE. Binding of IL-4 required iduronic acid, an N-sulfate group (heparin) and specific O sulfates (CSB and heparin). Together, these data demonstrate that monocyte cell surface chondroitin sulfates play an important role in the IL-4-driven differentiation of monocytes into DCs. PMID:18322173

den Dekker, Els; Grefte, Sander; Huijs, Tonnie; ten Dam, Gerdy B; Versteeg, Elly M M; van den Berk, Lieke C J; Bladergroen, Bellinda A; van Kuppevelt, Toin H; Figdor, Carl G; Torensma, Ruurd

2008-03-15

316

Zoledronic acid causes ?? T cells to target monocytes and down-modulate inflammatory homing.  

PubMed

Zoledronic acid (ZA) is a potential immunotherapy for cancer because it can induce potent ?? T-cell-mediated anti-tumour responses. Clinical trials are testing the efficacy of intravenous ZA in cancer patients; however, the effects of systemic ZA on the activation and migration of peripheral ?? T cells remain poorly understood. We found that ?? T cells within ZA-treated peripheral blood mononuclear cells were degranulating, as shown by up-regulated expression of CD107a/b. Degranulation was monocyte dependent because CD107a/b expression was markedly reduced in the absence of CD14(+) cells. Consistent with monocyte-induced degranulation, we observed ?? T-cell-dependent induction of monocyte apoptosis, as shown by phosphatidylserine expression on monocytes and decreased percentages of monocytes in culture. Despite the prevailing paradigm that ZA promotes tumour homing in ?? T cells, we observed down-modulation of their tumour homing capacity, as shown by decreased expression of the inflammatory chemokine receptors CCR5 and CXCR3, and reduced migration towards the inflammatory chemokine CCL5. Taken together our data suggest that ZA causes ?? T cells to target monocytes and down-modulate the migratory programme required for inflammatory homing. This study provides novel insight into how ?? T cells interact with monocytes and the possible implications of systemic use of ZA in cancer. PMID:24912747

Fowler, Daniel W; Copier, John; Dalgleish, Angus G; Bodman-Smith, Mark D

2014-12-01

317

Influence of bevacizumab, sunitinib and sorafenib as single agents or in combination on the inhibitory effects of VEGF on human dendritic cell differentiation from monocytes  

PubMed Central

Vascular endothelial growth factor (VEGF) inhibits differentiation and maturation of dendritic cells (DC), suggesting a potential immunosuppressive role for this proangiogenic factor. Bevacizumab, sorafenib and sunitinib target VEGF-mediated angiogenesis and are active against several types of cancer, but their effects on the immune system are poorly understood. In this study, VEGF and supernatants of renal carcinoma cell lines cultured under hypoxia were found to alter the differentiation of human monocytes to DC. Resulting DC showed impaired activity, as assessed by the alloreactive mixed T-lymphocyte reaction. Bevacizumab and sorafenib, but not sunitinib, reversed the inhibitory effects of VEGF, but not of those mediated by tumour supernatants. Dendritic cells matured under the influence of VEGF expressed less human leukocyte antigen-DR (HLA-DR) and CD86, and this effect was restored by bevacizumab and sorafenib. Finally, tumour-cell supernatants decreased interleukin-12 (IL-12) production by mature DC, and such inhibition was not restored by any of the tested drugs, delivered either as single agents or in combination. The deleterious effects of tumour-cell supernatants were mainly mediated by thermostable molecules distinct from VEGF. These results indicate that inhibition of the differentiation of monocytes to DC is a multifactorial effect, and that they support the development of combinations of angiogenesis inhibitors with immunological modulators. PMID:19277038

Alfaro, C; Suarez, N; Gonzalez, A; Solano, S; Erro, L; Dubrot, J; Palazon, A; Hervas-Stubbs, S; Gurpide, A; Lopez-Picazo, J M; Grande-Pulido, E; Melero, I; Perez-Gracia, J L

2009-01-01

318

Orosomucoid 1 drives opportunistic infections through the polarization of monocytes to the M2b phenotype.  

PubMed

Orosomucoid (ORM, composed of two isoforms, ORM1 and ORM2) has been described as an inducer of M2 macrophages, which are cells that decrease host antibacterial innate immunities. However, it is unknown which phenotypes of M2 macrophages are induced by ORM. In this study, healthy donor monocytes stimulated with ORM (ORM-monocytes) were characterized phenotypically and biologically. CCL1 (a biomarker of M2b macrophages) and IL-10 were detected in monocyte cultures supplemented with ORM1; however, CCL17 (a biomarker of M2a macrophages) and CXCL13 (a biomarker of M2c macrophages) were not produced in these cultures. All of these soluble factors were not detected in the culture fluids of monocytes stimulated with ORM2. Monocytes stimulated with ORM1 were characterized as CD64(-)CD209(-)CD163(+)CCL1(+) cells. MRSA and Enterococcus faecalis infections were accelerated in chimeras (NOD/scid IL-2R?(null) mice reconstituted with white blood cells) after inoculation with monocytes stimulated with ORM1 or treatment with ORM1; however, the infections were greatly mitigated in both chimeras inoculated with ORM1-stimulated monocytes and treated with ORM1, after an additional treatment with an inhibitor of M2b macrophages (CCL1 antisense ODN). These results indicate that ORM1 stimulates quiescent monocytes to polarize to M2b monocytes. The regulation of M2b macrophages may be beneficial in controlling opportunistic infections in patients with a large amount of plasma ORM1. PMID:25689617

Nakamura, Kiwamu; Ito, Ichiaki; Kobayashi, Makiko; Herndon, David N; Suzuki, Fujio

2015-05-01

319

On-chip phenotypic analysis of inflammatory monocytes in atherogenesis and myocardial infarction.  

PubMed

Monocyte recruitment to inflamed arterial endothelium initiates plaque formation and drives progression of atherosclerosis. Three distinct monocyte subsets are detected in circulation (CD14(++)CD16(-), CD14(++)CD16(+), and CD14(+)CD16(++)), and each may play distinct roles during atherogenesis and myocardial infarction. We studied a range of subjects that included otherwise healthy patients with elevated serum triglyceride levels to patients presenting with acute myocardial infarction. Our objective was to correlate an individual's risk with the activation state of each monocyte subset as a function of changes in adhesion receptor expression using flow cytometric quantitation of integrins and l-selectin membrane expression. A microfluidic-based laboratory-on-a-chip was developed to quantify the adhesion efficiency of monocytes sheared in whole blood on vascular cell adhesion molecule-1, while characterizing adhesion receptor expression and topography on captured monocytes. CD14(++)CD16(+) monocytes adhered with sevenfold higher efficiency than other subsets, and in patients with myocardial infarction the capture efficiency of this subset was double that for healthy subjects. In patients with hypertriglyceridemia, this increase in monocyte adhesion was attributable to CD14(++)CD16(+) uptake of triglyceride-rich lipoproteins and subsequent signaling via a Phospholipase C-dependent mechanism to increase CD11c expression, very late antigen-4 function, and integrin coclustering within focal adhesive sites on vascular cell adhesion molecule-1. In summary, we introduce a unique laboratory-on-a-chip method for quantifying the activation state of monocyte subsets. These experiments reveal that CD11c/CD18 is an inducible integrin whose expression correlates with a monocyte inflammatory state in subjects at risk for atherogenesis and in patients with myocardial infarction. PMID:23918401

Foster, Greg A; Gower, R Michael; Stanhope, Kimber L; Havel, Peter J; Simon, Scott I; Armstrong, Ehrin J

2013-08-20

320

What Is Chronic Lymphocytic Leukemia?  

MedlinePLUS

... key statistics for chronic lymphocytic leukemia? What is chronic lymphocytic leukemia? Chronic lymphocytic leukemia (CLL) is a type of ... and other tissues. Are there different types of CLL? Doctors have found that there seem to be ...

321

Normal microbicidal function of monocytes in a girl with chronic granulomatous disease.  

PubMed

The history of a 13-year-old girl with a syndrome resembling Chronic Granulomatous Disease (C.G.D.) is described. Metabolic studies in granulocytes and monocytes classified the patient as having C.G.D. The granulocytes failed to kill Staphylococcus aureus and Candida Albicans; however, the killing of these microorganisms by the patient's monocytes was nearly normal. Family studies revealed no abnormalities in the phagocytic cells of the parents and the siblings. PMID:7246138

Weemaes, C; Leijh, P; Blussé van Oud Alblas, D; van der Meer, J; van Furth, R

1981-01-01

322

Methylomics of gene expression in human monocytes.  

PubMed

DNA methylation is one of several epigenetic mechanisms that contribute to the regulation of gene expression; however, the extent to which methylation of CpG dinucleotides correlates with gene expression at the genome-wide level is still largely unknown. Using purified primary monocytes from subjects in a large community-based cohort (n = 1264), we characterized methylation (>485 000 CpG sites) and mRNA expression (>48K transcripts) and carried out genome-wide association analyses of 8370 expression phenotypes. We identified 11 203 potential cis-acting CpG loci whose degree of methylation was associated with gene expression (eMS) at a false discovery rate threshold of 0.001. Most of the associations were consistent in effect size and direction of effect across sex and three ethnicities. Contrary to expectation, these eMS were not predominately enriched in promoter regions, or CpG islands, but rather in the 3' UTR, gene bodies, CpG shores or 'offshore' sites, and both positive and negative correlations between methylation and expression were observed across all locations. eMS were enriched for regions predicted to be regulatory by ENCODE (Encyclopedia of DNA Elements) data in multiple cell types, particularly enhancers. One of the strongest association signals detected (P < 2.2 × 10(-308)) was a methylation probe (cg17005068) in the promoter/enhancer region of the glutathione S-transferase theta 1 gene (GSTT1, encoding the detoxification enzyme) with GSTT1 mRNA expression. Our study provides a detailed description of the epigenetic architecture in human monocytes and its relationship to gene expression. These data may help prioritize interrogation of biologically relevant methylation loci and provide new insights into the epigenetic basis of human health and diseases. PMID:23900078

Liu, Yongmei; Ding, Jingzhong; Reynolds, Lindsay M; Lohman, Kurt; Register, Thomas C; De La Fuente, Alberto; Howard, Timothy D; Hawkins, Greg A; Cui, Wei; Morris, Jessica; Smith, Shelly G; Barr, R Graham; Kaufman, Joel D; Burke, Gregory L; Post, Wendy; Shea, Steven; McCall, Charles E; Siscovick, David; Jacobs, David R; Tracy, Russell P; Herrington, David M; Hoeschele, Ina

2013-12-15

323

Methylomics of gene expression in human monocytes  

PubMed Central

DNA methylation is one of several epigenetic mechanisms that contribute to the regulation of gene expression; however, the extent to which methylation of CpG dinucleotides correlates with gene expression at the genome-wide level is still largely unknown. Using purified primary monocytes from subjects in a large community-based cohort (n = 1264), we characterized methylation (>485 000 CpG sites) and mRNA expression (>48K transcripts) and carried out genome-wide association analyses of 8370 expression phenotypes. We identified 11 203 potential cis-acting CpG loci whose degree of methylation was associated with gene expression (eMS) at a false discovery rate threshold of 0.001. Most of the associations were consistent in effect size and direction of effect across sex and three ethnicities. Contrary to expectation, these eMS were not predominately enriched in promoter regions, or CpG islands, but rather in the 3? UTR, gene bodies, CpG shores or ‘offshore’ sites, and both positive and negative correlations between methylation and expression were observed across all locations. eMS were enriched for regions predicted to be regulatory by ENCODE (Encyclopedia of DNA Elements) data in multiple cell types, particularly enhancers. One of the strongest association signals detected (P < 2.2 × 10?308) was a methylation probe (cg17005068) in the promoter/enhancer region of the glutathione S-transferase theta 1 gene (GSTT1, encoding the detoxification enzyme) with GSTT1 mRNA expression. Our study provides a detailed description of the epigenetic architecture in human monocytes and its relationship to gene expression. These data may help prioritize interrogation of biologically relevant methylation loci and provide new insights into the epigenetic basis of human health and diseases. PMID:23900078

Liu, Yongmei; Ding, Jingzhong; Reynolds, Lindsay M.; Lohman, Kurt; Register, Thomas C.; De La Fuente, Alberto; Howard, Timothy D.; Hawkins, Greg A.; Cui, Wei; Morris, Jessica; Smith, Shelly G.; Barr, R. Graham; Kaufman, Joel D.; Burke, Gregory L.; Post, Wendy; Shea, Steven; Mccall, Charles E.; Siscovick, David; Jacobs, David R.; Tracy, Russell P.; Herrington, David M.; Hoeschele, Ina

2013-01-01

324

MD Anderson study finds weekly dose reduces a targeted drug's side effects but not its activity against acute lymphocytic leukemia  

Cancer.gov

A potent chemotherapy agent wrapped within a monoclonal antibody selectively destroys the malignant cells responsible for acute lymphocytic leukemia (ALL) in either weekly or monthly dosing, researchers report at the 54th ASH Annual Meeting and Exposition. This "Trojan horse" assault on the cancer cells has significantly increased the response rate among patients with ALL, and now an MD Anderson Cancer Center clinical trial finds that weekly dosing works well and reduces side effects.

325

Study from MD Anderson and Ohio State finds B cell receptor inhibitor causes remission in chronic lymphocytic leukemia:  

Cancer.gov

A new, targeted approach to treating chronic lymphocytic leukemia (CLL) has produced durable remissions in a Phase I/II clinical trial for patients with relapsed or resistant disease, investigators report at the 53rd Annual Meeting of the American Society of Hematology... The agent, called PCI-32765, is the first drug designed to target Bruton’s tyrosine kinase, a protein essential for CLL-cell survival and proliferation.

326

Gene expression profiles of T lymphocytes are sensitive to the influence of heavy smoking: a pilot study  

Microsoft Academic Search

Cigarette smoke components have a proven negative influence on human health. Adverse metabolic effects were observed in tissues\\u000a and single cells. T lymphocytes get in contact with affected organs (e.g., lung) or cells (e.g., erythrocytes), as well as\\u000a with smoke components and bioactive molecules, whose production is triggered by tobacco smoke. We therefore compared the gene\\u000a expression profiles in these

Petra Büttner; Sandy Mosig; Harald Funke

2007-01-01

327

Regulation of Nitric Oxide Production by Murine Peritoneal Macrophages Treated in Vitro with Chemokine Monocyte Chemoattractant Protein 1  

Microsoft Academic Search

Monocyte chemoattractant protein 1 (MCP-1) is an important mediator of monocyte\\/macrophage recruitment and activation at the sites of chronic inflammation and neoplasia. In the current study, the role of nitrogen monoxide (NO) in the activation of murine peritoneal macrophages to the tumoricidal state in response to in vitro MCP-1 treatment and the regulatory mechanisms involved therein were investigated. Murine peritoneal

Subhra Kumar Biswas; Ajit Sodhi; Saki Paul

2001-01-01

328

Androgen Exposure Increases Human Monocyte Adhesion to Vascular Endothelium and Endothelial Cell Expression of Vascular Cell Adhesion Molecule1  

Microsoft Academic Search

Background—Male sex is an independent risk factor for coronary artery disease. Owing to the importance of monocyte adhesion to endothelial cells in the development of atherosclerosis, we hypothesized that androgens might promote this process. We therefore studied the effects of the nonaromatizable androgen dihydrotestosterone (DHT) on human monocyte adhesion to human endothelial cells and on endothelial cell-surface expression of adhesion

Jane A. McCrohon; Wendy Jessup; David J. Handelsman; David S. Celermajer

329

Monocytes from Patients with Indeterminate and Cardiac Forms of Chagas' Disease Display Distinct Phenotypic and Functional Characteristics Associated with Morbidity  

Microsoft Academic Search

Many studies have demonstrated that monocyte-derived macrophages display critical activities in immunity to parasites. The ability of these cells to process and present antigens, produce cytokines, and provide costimulatory signals demonstrates their pivotal role in initiating immune responses. Although potential modulatory function has been attributed to monocytes from patients with Chagas' disease, a systematic phenotypic and functional analysis of these

Paulo E. A. Souza; Manoel O. C. Rocha; Etel Rocha-Vieira; Cristiane A. S. Menezes; Andrea C. L. Chaves; Kenneth J. Gollob; Walderez O. Dutra

2004-01-01

330

Chronic Lymphocytic Leukemia (CLL)  

MedlinePLUS

What is chronic lymphocytic leukemia (CLL)? The most common type of leukemia, this slow-growing cancer is a blood and bone marrow disease. About 15, ... and Lymphoma Society). Type the keywords chronic lymphocytic leukemia into the search box. What kinds of questions ...

331

Methamphetamine cytotoxicity and effect on LPS-stimulated IL1? production by human monocytes  

Microsoft Academic Search

Methamphetamine (METH) abuse is associated with “METH mouth”, characterized by rampant dental decay and destruction of periodontal bone and soft tissues. In periodontitis, monocyte\\/macrophages, stimulated by bacterial lipopolysaccharide (LPS), produce interleukin-1? (IL-1?), contributing to bone and soft tissue degradation. Effects of METH on monocyte\\/macrophages and its role in periodontitis are unknown. The objective of this study was to determine METH

D. A. Tipton; Z. T. Legan; M. Kh. Dabbous

2010-01-01

332

Histamine downregulates CD14 expression via H2 receptorson human monocytes  

Microsoft Academic Search

Lipopolysaccharide (LPS) binds to LPS-binding protein (LBP) in plasma and is delivered to the cell surface receptor CD14 on human monocyte. LPS is transferred to the transmembrane signaling receptor toll-like receptor (TLR) 4. In the present study, the effect of histamine on the expression of CD14 on human monocytes was investigated. Histamine concentration- and time-dependently decreased the expression of cell

Hideo Kohka Takahashi; Toshihiko Morichika; Hiromi Iwagaki; Ryuji Tamura; Shinichiro Kubo; Tadashi Yoshino; Shuji Mori; Tadaatsu Akagi; Noriaki Tanaka; Masahiro Nishibori

2003-01-01

333

Cuprophane haemodialysis induces upregulation of LPS receptor (CD14) on monocytes: role of complement activation  

Microsoft Academic Search

Background. The CD 14 molecule is a high-affinity receptor for the complex formed by lipopolysaccharide (LPS) and LPS-binding protein. Methods. We examined by flow cytometry the effect of in vitro and in vivo haemodialysis on cuprophane membrane and recombinant C5a on the expression of CD14 molecules at the surface of monocytes. Monocyte CD 14 expression was also studied during in

A. Marchant; C. Tielemans; C. Husson; K. Gastaldello; T. Schurmans; D. De Groote; J. Duchow; J. L. Vanherweghem; M. Goldman

1996-01-01

334

Monocyte and macrophage regulation of pulmonary fibrosis   

E-print Network

In this thesis I examined the role of circulating monocytes and lung macrophages in the pathogenesis of the early fibrotic, progressive fibrotic and resolution phases of pulmonary fibrosis. Pulmonary fibrosis with ...

Gibbons, Michael A.

2010-01-01

335

Granulocyte-macrophage colony-stimulating factor down-regulates CD14 expression on monocytes.  

PubMed Central

CD14 is a differentiation-stage-linked glycosyl-phophatidyl-inositol-linked glycoprotein on human peripheral blood monocytes and tissue macrophages, which functions as a receptor for lipopolysaccharide. Here, the effects of granulocyte macrophage colony-stimulating factor (GM-CSF1 a cytokine with proliferation- and differentiation-inducing properties on myeloid lineage cells, were studied on CD14 expression by peripheral blood cells. GM-CSF down-regulated the membrane expression of CD14 on monocytes while it up-regulated expression on neutrophils. GM-CSF also decreased the spontaneous release of CD14 in monocyte culture supernatants. Down-regulation of CD14 expression and release was accompanied by a decrease in the mRNA transcript for CD14, suggesting that it most likely reflects an effect on the transcriptional level. The functional significance of this phenomenon, and its potential relation to the terminal differentiation of monocytes, are discussed. Images Figure 6 PMID:8911145

Kruger, M; Van de Winkel, J G; De Wit, T P; Coorevits, L; Ceuppens, J L

1996-01-01

336

Human Monocytes Undergo Functional Re-programming during Sepsis Mediated by Hypoxia-Inducible Factor-1?.  

PubMed

Sepsis is characterized by a dysregulated inflammatory response to infection. Despite studies in mice, the cellular and molecular basis of human sepsis remains unclear and effective therapies are lacking. Blood monocytes serve as the first line of host defense and are equipped to recognize and respond to infection by triggering an immune-inflammatory response. However, the response of these cells in human sepsis and their contribution to sepsis pathogenesis is poorly understood. To investigate this, we performed a transcriptomic, functional, and mechanistic analysis of blood monocytes from patients during sepsis and after recovery. Our results revealed the functional plasticity of monocytes during human sepsis, wherein they transited from a pro-inflammatory to an immunosuppressive phenotype, while enhancing protective functions like phagocytosis, anti-microbial activity, and tissue remodeling. Mechanistically, hypoxia inducible factor-1? (HIF1?) mediated this functional re-programming of monocytes, revealing a potential mechanism for their therapeutic targeting to regulate human sepsis. PMID:25746953

Shalova, Irina N; Lim, Jyue Yuan; Chittezhath, Manesh; Zinkernagel, Annelies S; Beasley, Federico; Hernández-Jiménez, Enrique; Toledano, Victor; Cubillos-Zapata, Carolina; Rapisarda, Annamaria; Chen, Jinmiao; Duan, Kaibo; Yang, Henry; Poidinger, Michael; Melillo, Giovanni; Nizet, Victor; Arnalich, Francisco; López-Collazo, Eduardo; Biswas, Subhra K

2015-03-17

337

An in vitro study of liposomal curcumin: stability, toxicity and biological activity in human lymphocytes and Epstein-Barr virus-transformed human B-cells.  

PubMed

Curcumin is a multi-functional and pharmacologically safe natural agent. Used as a food additive for centuries, it also has anti-inflammatory, anti-virus and anti-tumor properties. We previously found that it is a potent inhibitor of cyclosporin A (CsA)-resistant T-cell co-stimulation pathway. It inhibits mitogen-stimulated lymphocyte proliferation, NFkappaB activation and IL-2 signaling. In spite of its safety and efficacy, the in vivo bioavailability of curcumin is poor, and this may be a major obstacle to its utility as a therapeutic agent. Liposomes are known to be excellent carriers for drug delivery. In this in vitro study, we report the effects of different liposome formulations on curcumin stability in phosphate buffered saline (PBS), human blood, plasma and culture medium RPMI-1640+10% FBS (pH 7.4, 37 degrees C). Liposomal curcumin had higher stability than free curcumin in PBS. Liposomal and free curcumin had similar stability in human blood, plasma and RPMI-1640+10% FBS. We looked at the toxicity of non-drug-containing liposomes on (3)H-thymidine incorporation by concanavalin A (Con A)-stimulated human lymphocytes, splenocytes and Epstein-Barr virus (EBV)-transformed human B-cell lymphoblastoid cell line (LCL). We found that dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylglycerol (DMPG) were toxic to the tested cells. However, addition of cholesterol to the lipids at DMPC:DMPG:cholesterol=7:1:8 (molar ratio) almost completely eliminated the lipid toxicity to these cells. Liposomal curcumin had similar or even stronger inhibitory effects on Con A-stimulated human lymphocyte, splenocyte and LCL proliferation. We conclude that liposomal curcumin may be useful for intravenous administration to improve the bioavailability and efficacy, facilitating in vivo studies that could ultimately lead to clinical application of curcumin. PMID:18840516

Chen, Changguo; Johnston, Thomas D; Jeon, Hoonbae; Gedaly, Roberto; McHugh, Patrick P; Burke, Thomas G; Ranjan, Dinesh

2009-01-21

338

Fate of gamma-interferon-activated killer blood monocytes adoptively transferred into the abdominal cavity of patients with peritoneal carcinomatosis  

SciTech Connect

Five patients with colorectal cancer widely metastatic to peritoneal surfaces have been treated i.p. with infusions of autologous blood monocytes made cytotoxic by in vitro incubation with human gamma-interferon. The monocytes were purified by a combination of cytapheresis and counter-current centrifugal elutriation procedures; each week approximately 350 million activated monocytes were given to patients as adoptive immunotherapy by a single i.p. instillation. On the eighth cycle of treatment the trafficking of i.p. infused blood monocytes was studied in two patients by prelabeling the cells with /sup 111/In. These activated cells became distributed widely within the peritoneal cavity. Two and 5 days after infusion their position within the peritoneum had not changed. When peritoneal specimens were obtained 36 h after /sup 111/In-labeled monocyte infusion, labeled monocytes were demonstrated to be associated with the serosal surfaces by autoradiographic analysis. Scintiscanning structures outside the abdominal cavity revealed that /sup 111/In-labeled monocytes infused i.p. did not traffic to other organs during the 5 days of the study. We conclude that i.p. adoptive transfer of autologous killer blood monocytes is an effective way of delivering these cytotoxic cells to sites of tumor burden on peritoneal surfaces in these cancer patients.

Stevenson, H.C.; Keenan, A.M.; Woodhouse, C.; Ottow, R.T.; Miller, P.; Steller, E.P.; Foon, K.A.; Abrams, P.G.; Beman, J.; Larson, S.M.

1987-11-15

339

Immunophenotyping of CSF lymphocytes  

E-print Network

Abstract—Background: Although many lines of evidence suggest an autoimmune etiology, the pathophysiology of opsoc-lonus–myoclonus syndrome (OMS) remains poorly understood and no immunologic abnormalities have correlated with neurologic severity. Conventional immunotherapies often do not prevent relapse or permanent sequelae. Objective: To test the cellular immune hypothesis of OMS in a cross-sectional study and determine if CSF lymphocyte subset analysis provides biomarkers of disease activity. Methods: The expression of lymphocyte surface antigens was investigated in CSF and blood of 36 children with OMS and 18 control subjects, using a comprehensive panel of monoclonal antibodies to adhesion and activation proteins in combination with anti-CD3 and anti-CD45 antibodies in four-color fluorescence-activated cell sorting. Results: Although most children with OMS had normal CSF cell counts, they exhibited expansion of CD19 B-cell (up to 29%) and T-cell (up to 26%) subsets and a lower percentage of CD4 T-cells and CD4/CD8 ratio, which persisted even years after disease onset and conventional treatments. The percentage of activated CSF T-cells was also higher. Abnormalities correlated with neurologic severity, as scored blinded from videotapes using a 12-item motor scale, and disease duration. No significant differences were found between tumor and no-tumor groups. In children with neuroblastoma, tumor resection or cancer chemotherapy did not alter immunologic abnormalities. Conclusions: CSF B-and T-cell recruitment is linked to neurologic signs in pediatric OMS, which may relate to relapses and disease progression.

S. J. Verhulst Phd

340

Immunomodulation of human monocytes following exposure to Lutzomyia intermedia saliva  

Microsoft Academic Search

Background  Sand fly saliva contains potent and complex pharmacologic molecules that are able to modulate the host's hemostatic, inflammatory,\\u000a and immune systems. In this study, we evaluated the effects of salivary gland sonicate (SGS) ofLutzomyia intermedia, the natural vector ofLeishmania braziliensis, on monocytes obtained from the peripheral blood mononuclear cells (PBMC) of healthy volunteers. We investigated the effects\\u000a of sand fly

Maria José Menezes; Dirceu J Costa; Jorge Clarêncio; José Carlos Miranda; Aldina Barral; Manoel Barral-Netto; Cláudia Brodskyn; Camila I de Oliveira

2008-01-01

341

Chloride and potassium channels in U937 human monocytes  

Microsoft Academic Search

Summary Ionic channels in a human monocyte cell line (U937) were studied with the inside-out patch-clamp technique. A Ca2+-activated K+ channel and three Cl--selective channels were observed. The Ca2+-activated K+ channel had an inward-rectifying current-voltage relationship with slope conductance of 28 pS, and was not dependent on membrane potential. Among the three Cl- channels, and outward-rectifying 28-pS channel was most

Tomohiko Kanno; Tamotsu Takishima

1990-01-01

342

Acceleration of endothelial cell differentiation from CD14-positive monocytes  

Microsoft Academic Search

Introduction.In vitro differentiation of endothelial cells has potential applications in vascular tissue engineering and cell-based therapy for many diseases. The purpose of this study was to develop a new strategy that utilizes cytokines and LPS to accelerate the process of endothelial cell differentiation. Methods. CD14-positive monocytes were purified from human peripheral blood mononuclear cells (PBMC) by MACS separator. The purified

R. Zhang; H. Yang; P. Lin; A. Lumsden; C. Chen; Q. Yao

2004-01-01

343

Visualization of bone marrow monocyte mobilization using Cx3cr1gfp/+Flt3L-/- reporter mouse by multiphoton intravital microscopy.  

PubMed

Monocytes are innate immune cells that play critical roles in inflammation and immune defense. A better comprehension of how monocytes are mobilized and recruited is fundamental to understand their biologic role in disease and steady state. The BM represents a major "checkpoint" for monocyte homeostasis, as it is the primary site for their production and release. Our study determined that the Cx3cr1(gfp/+) mouse strain is currently the most ideal model for the visualization of monocyte behavior in the BM by multiphoton intravital microscopy. However, we observed that DCs are also labeled with high levels of GFP and thus, interfere with the accuracy of monocyte tracking in vivo. Hence, we generated a Cx3cr1(gfp/+)Flt3L(-/-) reporter mouse and showed that whereas monocyte numbers were not affected, DC numbers were reduced significantly, as DCs but not monocytes depend on Flt3 signaling for their development. We thus verified that mobilization of monocytes from the BM in Cx3cr1(gfp/+)Flt3L(-/-) mice is intact in response to LPS. Collectively, our study demonstrates that the Cx3cr1(gfp/+)Flt3L(-/-) reporter mouse model represents a powerful tool to visualize monocyte activities in BM and illustrates the potential of a Cx3cr1(gfp/+)-based, multifunctionality fluorescence reporter approach to dissect monocyte function in vivo. PMID:25516753

Evrard, Maximilien; Chong, Shu Zhen; Devi, Sapna; Chew, Weng Keong; Lee, Bernett; Poidinger, Michael; Ginhoux, Florent; Tan, Suet Mien; Ng, Lai Guan

2015-03-01

344

The effect of HA, TCP and ALCAP bioceramic capsules on the viability of human monocyte and monocyte derived macrophages.  

PubMed

The relationship between various bioceramics used in surgical implantation and inflammatory cellular response has not been fully elucidated. The objective of this study was to investigate the effect of various biomedical ceramics such as tricalcium phosphate (TCP), hydroxyapatite (HA), and aluminum-calcium-phosphorous oxide (ALCAP) on the adherence and viability of human monocyte and monocyte derived macrophages in vitro. The monocytes were isolated from human peripheral blood and seeded at a density of 5 x 10(5) cells/well according to standard laboratory procedures. Cells were considered macrophages after remaining in culture for 24 hours. Cells were then plated in each microtiter well loaded with ceramic capsules (HA, TCP and ALCAP) and buffered control. At the end of 1, 2, 3, and 7 days the viability and cell number of monocyte or monocyte derived macrophages were determined using an established assay. Cell number was determined in control wells with known amounts of cell number, a standard curve was generated by plotting absorbance units versus cell number. Biochemical analysis was performed on the aliquots obtained from the experimental and control wells at the end of each phase of the investigation. The data from this experiment suggest that: (I) monocytes and macrophages are capable of adhering to the surface of HA, TCP and ALCAP in an in vitro environment for over a 7 day period. (II) Long term incubation of ceramic capsules with macrophages revealed that the cells experienced gradual disassociation phenomenon with a greater number of cell detachment seen in the ALCAP contained wells. (III) SEM analysis of representative capsules demonstrated that there is an increase in the number of micropores on the surface of the materials after contacting a cellular environment. This observation suggest that the material surface has been modified (TCP > HA = ALCAP). (IV) Biochemical analysis of aliquots at the end of each phase showed a significant change (P < 0.05) in the activity of catalase and superoxide dismutase (SOD). Information obtained from this study provided new insights on the interrelationship between bioceramics and the possible cell response during chronic inflammation at the site of implantation. PMID:8672693

Ross, L; Benghuzzi, H; Tucci, M; Callender, M; Cason, Z; Spence, L

1996-01-01

345

Nef Protein of Human Immunodeficiency Virus and Lipopolysaccharide Induce Expression of CD14 on Human Monocytes through Differential Utilization of Interleukin10  

Microsoft Academic Search

We investigated the expression of membrane-bound CD14 (mCD14) on monocytes and soluble CD14 (sCD14) released into the culture supernatants of peripheral blood lymphocytes (PBMC) from human immu- nodeficiency virus (HIV)-infected individuals. Monocytes from HIV-positive individuals exhibited both en- hanced mCD14 expression and sCD14 production in the PBMC culture supernatants compared to the levels of mCD14 and sCD14 in HIV-negative individuals.

David Creery; Jonathan B. Angel; Susan Aucoin; William Weiss; William D. Cameron; Francisco Diaz-Mitoma; Ashok Kumar

2002-01-01

346

Lipopolysaccharide induces the interactions of breast cancer and endothelial cells via activated monocytes.  

PubMed

The adhesion of circulating cancer cells to vascular endothelium is a key step in hematogenous metastasis. Cancer cell-endothelium interactions are mediated by cell adhesion molecules that can also be involved in the arrest of monocytes and other circulating leukocytes on endothelium in inflammation. Static and microfluidic flow adhesion assays as well as flow cytometry were conducted in this study to elucidate the role of monocytes, bacterial lipopolysaccharide (LPS), and histamine in breast cancer cell adhesion to vascular endothelial cells. Tumor necrosis factor-? (TNF-?) released from LPS-treated monocytes triggered the expression of intercellular cell adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) on endothelial cells. Histamine augmented the TNF-? effect, leading to a high number of arrested breast cancer cells under both static and shear flow conditions. LPS-treated monocytes were shown to enhance the arrest of breast cancer cells by anchoring the cancer cells to activated endothelial cells. This anchorage was achieved by binding cancer cell ICAM-1 to monocyte ?2 integrins and binding endothelial ICAM-1 and VCAM-1 to monocyte ?1 and ?2 integrins. The results of this study imply that LPS is an important risk factor for cancer metastasis and that the elevated serum level of histamine further increases the risk of LPS-induced cancer metastasis. Preventing bacterial infections is essential in cancer treatment, and it is particularly vital for cancer patients affected by allergy. PMID:24333719

Chen, Chong; Khismatullin, Damir B

2014-04-01

347

Differential Oxidative Stress Induced by Dengue Virus in Monocytes from Human Neonates, Adult and Elderly Individuals  

PubMed Central

Changes in immune response during lifespan of man are well known. These changes involve decreased neonatal and elderly immune response. In addition, it has been shown a relationship between immune and oxidative mechanisms, suggesting that altered immune response could be associated to altered oxidative response. Increased expression of nitric oxide (NO) has been documented in dengue and in monocyte cultures infected with different types of dengue virus. However, there is no information about the age-dependent NO oxidative response in humans infected by dengue virus. In this study, monocyte cultures from neonatal, elderly and adult individuals (n?=?10 each group) were infected with different dengue virus types (DENV- 1 to 4) and oxidative/antioxidative responses and apoptosis were measured at days 1 and 3 of culture. Increased production of NO, lipid peroxidation and enzymatic and nonenzymatic anti-oxidative responses in dengue infected monocyte cultures were observed. However, neonatal and elderly monocytes had lower values of studied parameters when compared to those in adult-derived cultures. Apoptosis was present in infected monocytes with higher values at day 3 of culture. This reduced oxidant/antioxidant response of neonatal and elderly monocytes could be relevant in the pathogenesis of dengue disease. PMID:24069178

Valero, Nereida; Mosquera, Jesús; Añez, Germán; Levy, Alegria; Marcucci, Rafael; de Mon, Melchor Alvarez

2013-01-01

348

Increased Migration of Monocytes in Essential Hypertension Is Associated with Increased Transient Receptor Potential Channel Canonical Type 3 Channels  

PubMed Central

Increased transient receptor potential canonical type 3 (TRPC3) channels have been observed in patients with essential hypertension. In the present study we tested the hypothesis that increased monocyte migration is associated with increased TRPC3 expression. Monocyte migration assay was performed in a microchemotaxis chamber using chemoattractants formylated peptide Met-Leu-Phe (fMLP) and tumor necrosis factor-? (TNF-?). Proteins were identified by immunoblotting and quantitative in-cell Western assay. The effects of TRP channel-inhibitor 2–aminoethoxydiphenylborane (2-APB) and small interfering RNA knockdown of TRPC3 were investigated. We observed an increased fMLP-induced migration of monocytes from hypertensive patients compared with normotensive control subjects (246±14% vs 151±10%). The TNF-?-induced migration of monocytes in patients with essential hypertension was also significantly increased compared to normotensive control subjects (221±20% vs 138±18%). In the presence of 2-APB or after siRNA knockdown of TRPC3 the fMLP-induced monocyte migration was significantly blocked. The fMLP-induced changes of cytosolic calcium were significantly increased in monocytes from hypertensive patients compared to normotensive control subjects. The fMLP-induced monocyte migration was significantly reduced in the presence of inhibitors of tyrosine kinase and phosphoinositide 3-kinase. We conclude that increased monocyte migration in patients with essential hypertension is associated with increased TRPC3 channels. PMID:22438881

Chen, Jing; Zhong, Jian; Yu, Hao; Xu, Xingsen; He, Hongbo; Yan, Zhencheng; Scholze, Alexandra; Liu, Daoyan; Zhu, Zhiming; Tepel, Martin

2012-01-01

349

The Physiology of Lymphocyte Migration  

Microsoft Academic Search

White blood cells (lymphocytes) are the mobile cells that make up the recognition and response component of the acquired immune system. There are pools of lymphocytes that recirculate the blood stream and the lymphatic system, there are lymphocytes that selectively home to tissues close to where the cells were created, and there are pools lymphocytes that are recruited to sites

JASON BROWNLEE

2007-01-01

350

Granulocyte and monocyte adsorption apheresis for generalized pustular psoriasis.  

PubMed

Granulocyte and monocyte adsorption apheresis (GCAP) is an extracorporeal circulation therapy that removes activated granulocytes and monocytes. GCAP was initially approved for the treatment of ulcerative colitis, which is attributed to activated granulocytes and macrophages that infiltrate the target tissues. Generalized pustular psoriasis (GPP) is also supposed to be caused by activated neutrophils. In this study, we treated two patients with refractory GPP by using GCAP. Patient 1, a 68-year-old woman who had liver cirrhosis, underwent seven GCAP sessions. Patient 2, a 26-year-old woman who had systemic lupus erythematosus and had been treated with systemic corticosteroids, underwent eight GCAP sessions. In both patients, GCAP resulted in an immediate improvement in skin lesions and fever reduction, without any adverse effects. We suggest that GCAP is an effective therapy for refractory GPP. PMID:22007872

Shukuya, Ryoko; Hasegawa, Toshio; Niwa, Yusuke; Okuma, Keiko; Ikeda, Shigaku

2011-12-01

351

Origin of monocytes and macrophages in a committed progenitor.  

PubMed

Monocytes, macrophages and dendritic cells (DCs) are developmentally related regulators of the immune system that share the monocyte-macrophage DC progenitor (MDP) as a common precursor. Unlike differentiation into DCs, the distal pathways for differentiation into monocytes and monocyte-derived macrophages are not fully elucidated. We have now demonstrated the existence of a clonogenic, monocyte- and macrophage-restricted progenitor cell derived from the MDP. This progenitor was a Ly6C(+) proliferating cell present in the bone marrow and spleen that generated the major monocyte subsets and macrophages, but not DCs or neutrophils. By in-depth quantitative proteomics, we characterized changes in the proteome during monocyte differentiation, which provided insight into the molecular principles of developing monocytes, such as their functional maturation. Thus, we found that monocytes and macrophages were renewed independently of DCs from a committed progenitor. PMID:23812096

Hettinger, Jan; Richards, David M; Hansson, Jenny; Barra, Melanie M; Joschko, Ann-Cathrin; Krijgsveld, Jeroen; Feuerer, Markus

2013-08-01

352

Retinal pigment epithelium cells promote the maturation of monocytes to macrophages in vitro.  

PubMed

Proliferative vitreoretinopathy is characterized by excessive cell proliferation within the eye; retinal pigment epithelial (RPE) cells form the majority of proliferating cells and interact with infiltrating leukocytes including monocytes. The purpose of this study was to determine the effect of RPE cells on the maturation of monocytes to macrophages. The enriched monocyte fraction of peripheral blood mononuclear cells was either cultured with or without RPE cells. The expression of the maturation-associated antigen CD16 on monocytes was assessed by flow cytometry, and the concentration of bioactive transforming growth factor-beta (TGF-beta) in the culture supernatant measured by mink lung epithelial cell (Mv1Lu) bioassay. The cellular density of CD16 in terms of mean fluorescence intensity was significantly higher on monocytes in coculture with RPE cells (p = 0.0153) than on monocytes in monoculture. The CD16 expression was significantly (p = 0.0093) reduced when antibodies to TGF-beta were added to the culture medium. RPE cells did not express CD16. Supernatants from cocultures also contained active TGF-beta (76.7 +/- 23.8 pg/ml), while in those of cell monocultures TGF-beta was close to the detection limit. We conclude that RPE cells stimulate and modulate the differentiation of monocytes to macrophages. Bioactive TGF-beta generated in the coculture was in part responsible for this effect. It seems likely that RPE cells or interactions between RPE cells and monocytes could be an important factor in inflammatory/immune processes and wound healing in the eye, which are probably involved in proliferative vitreoretinopathy. PMID:9112264

Osuský, R; Malik, P; Ryan, S J

1997-01-01

353

Monocyte ADAM17 promotes diapedesis during transendothelial migration: Identification of steps and substrates targeted by metalloproteinases  

PubMed Central

Despite expanded definition of the leukocyte adhesion cascade and mechanisms underlying individual steps, very little is known about regulatory mechanisms controlling sequential shifts between steps. We tested the hypothesis that metalloproteinases provide a mechanism to rapidly transition monocytes between different steps. Our study identifies diapedesis as a step targeted by metalloproteinase activity. Time-lapse video microscopy shows that the presence of a metalloproteinase inhibitor results in a doubling of the time required for human monocytes to complete diapedesis on unactivated or inflamed human endothelium, under both static and physiological-flow conditions. Thus, diapedesis is promoted by metalloproteinase activity. In contrast, neither adhesion of monocytes nor their locomotion over the endothelium is altered by metalloproteinase inhibition. We further demonstrate that metalloproteinase inhibition significantly elevates monocyte cell-surface levels of integrins CD11b/CD18 (Mac-1) specifically during transendothelial migration. Interestingly, such alterations are not detected for other endothelial- and monocyte-adhesion molecules that are presumed metalloproteinase substrates. Two major transmembrane metalloproteinases, ADAM17 and ADAM10, are identified as enzymes that control constitutive cleavage of Mac-1. We further establish that knockdown of monocyte ADAM17, but not endothelial ADAM10 or ADAM17, or monocyte ADAM10, reproduces the diapedesis delay observed with metalloproteinase inhibition. Therefore, we conclude that monocyte ADAM17 facilitates the completion of transendothelial migration by accelerating the rate of diapedesis. We propose that the progression of diapedesis may be regulated by spatial and temporal cleavage of Mac-1, which is triggered upon interaction with endothelium. PMID:23479224

Tsubota, Yoshiaki; Frey, Jeremy M.; Tai, Phillip W.L.; Welikson, Robert E.; Raines, Elaine W.

2013-01-01

354

Ibrutinib plus rituximab for patients with high-risk chronic lymphocytic leukaemia: a single-arm, phase 2 study  

PubMed Central

Summary Background Ibrutinib, an orally administered covalent inhibitor of Bruton tyrosine kinase (BTK), is an effective therapy for patients with relapsed chronic lymphocytic leukemia (CLL). We investigated the activity and safety of the combination of ibrutinib with the monoclonal antibody rituximab (iR) in patients with high-risk CLL. Methods In this single-arm, phase 2 studywe enrolled 40 patients with high-risk CLL at MD Anderson Cancer Center, Houston, Texas, USA. Patients with symptomatic CLL requiring therapy received 28 day cycles of once-daily ibrutinib 420 mg , together with rituximab (weekly during cycle 1, then once per cycle until cycle 6), followed by continuous single-agent ibrutinib. The primary endpoint was progression-free survival (PFS) in the intention-to-treat population. This study is registered with ClinicalTrials.gov, number NCT01520519 and is no longer accruing patients. Findings Between February 28, 2012 and September 11, 2012, we enrolled 40 CLL patients with high-risk disease features. 20 patients had del17p or TP53 mutations (16 previously treated, 4 untreated), 13 had relapsed CLL with del11q, and 7 patients a PFS < 36 months after frontline chemo-immunotherapy. Toxicity was mainly of mild to moderate severity (grade 1–2). 10 (25%) patients had diarrhea (grade 1 in 9 [22.5%] patients, grade 2 in 1 [2.5%]), bleeding events occurred in 14 (35%) patients (8 [20%] patients with grade 1, 5 [12.5%] patients grade 2, and 1 [2.5%] grade 3), nausea in 15 (37.5) patients (10 [25%] grade 1, 5 [12.5%] grade 2), and fatigue in 7 (17.5%) patients (4 [10%] grade 1, 3 [7.5%] grade 2). Grade 3 infections occurred in 4 patients (10%), no grade 4 or 5 infections occurred. At 18 months, the Kaplan Meier estimate of progression-free survival was 78% (95% CI 60.6–88.5) (del[17p] or TP53 mutation: 72%, 95% CI: 45.6–87.6) Interpretation Ibrutinib in combination with rituximab is a well-tolerated regimen for patients with high-risk CLL. It induces high rates of remissions and has positive impact on QOL in this difficult-to-treat patient population. These encouraging data merit further investigation of the added benefit of rituximab as combination partner for ibrutinib in an ongoing randomized trial, in which single-agent ibrutinib is compared to iR combination therapy (NCT02007044). Funding Pharmacyclics, Inc., Cancer Prevention and Research Institute of Texas (CPRIT), Leukemia & Lymphoma Society, NCI Grant P30 CA016672, MD Anderson’s Moon Shot Program in CLL, and MD Anderson Cancer Center Support Grant CA016672. PMID:25150798

Burger, Jan A.; Keating, Michael J.; Wierda, William G.; Hartmann, Elena; Hoellenriegel, Julia; Rosin, Nathalie Y.; de Weerdt, Iris; Jeyakumar, Ghayathri; Ferrajoli, Alessandra; Cardenas-Turanzas, Marylou; Lerner, Susan; Jorgensen, Jeffrey L; Nogueras-González, Graciela M.; Zacharian, Gracy; Huang, Xuelin; Kantarjian, Hagop; Garg, Naveen; Rosenwald, Andreas; O’Brien, Susan

2014-01-01

355

Diesel Exhaust Particle Exposure In Vitro Alters Monocyte Differentiation and Function  

PubMed Central

Air pollution by diesel exhaust particles is associated with elevated mortality and increased hospital admissions in individuals with respiratory diseases such as asthma and chronic obstructive pulmonary disease. During active inflammation monocytes are recruited to the airways and can replace resident alveolar macrophages. We therefore investigated whether chronic fourteen day exposure to low concentrations of diesel exhaust particles can alter the phenotype and function of monocytes from healthy individuals and those with chronic obstructive pulmonary disease. Monocytes were purified from the blood of healthy individuals and people with a diagnosis of chronic obstructive pulmonary disease. Monocyte-derived macrophages were generated in the presence or absence of diesel exhaust particles and their phenotypes studied through investigation of their lifespan, cytokine generation in response to Toll like receptor agonists and heat killed bacteria, and expression of surface markers. Chronic fourteen day exposure of monocyte-derived macrophages to concentrations of diesel exhaust particles >10 µg/ml caused mitochondrial and lysosomal dysfunction, and a gradual loss of cells over time both in healthy and chronic obstructive pulmonary disease individuals. Chronic exposure to lower concentrations of diesel exhaust particles impaired CXCL8 cytokine responses to lipopolysaccharide and heat killed E. coli, and this phenotype was associated with a reduction in CD14 and CD11b expression. Chronic diesel exhaust particle exposure may therefore alter both numbers and function of lung macrophages differentiating from locally recruited monocytes in the lungs of healthy people and patients with chronic obstructive pulmonary disease. PMID:23236439

Chaudhuri, Nazia; Jary, Hannah; Lea, Simon; Khan, Naimat; Piddock, Katie C.; Dockrell, David H.; Donaldson, Ken; Duffin, Rodger; Singh, Dave

2012-01-01

356

Production of monocytic cells from bone marrow stem cells: therapeutic usage in Alzheimer’s disease  

PubMed Central

Abstract Accumulation of amyloid ? (A?) is a major hallmark in Alzheimer’s disease (AD). Bone marrow derived monocytic cells (BMM) have been shown to reduce A? burden in mouse models of AD, alleviating the AD pathology. BMM have been shown to be more efficient phagocytes in AD than the endogenous brain microglia. Because BMM have a natural tendency to infiltrate into the injured area, they could be regarded as optimal candidates for cell-based therapy in AD. In this study, we describe a method to obtain monocytic cells from BM-derived haematopoietic stem cells (HSC). Mouse or human HSC were isolated and differentiated in the presence of macrophage colony stimulating factor (MCSF). The cells were characterized by assessing the expression profile of monocyte markers and cytokine response to inflammatory stimulus. The phagocytic capacity was determined with A? uptake assay in vitro and A? degradation assay of natively formed A? deposits ex vivo and in a transgenic APdE9 mouse model of AD in vivo. HSC were lentivirally transduced with enhanced green fluorescent protein (eGFP) to determine the effect of gene modification on the potential of HSC-derived cells for therapeutic purposes. HSC-derived monocytic cells (HSCM) displayed inflammatory responses comparable to microglia and peripheral monocytes. We also show that HSCM contributed to A? reduction and could be genetically modified without compromising their function. These monocytic cells could be obtained from human BM or mobilized peripheral blood HSC, indicating a potential therapeutic relevance for AD. PMID:21777378

Magga, Johanna; Savchenko, Ekaterina; Malm, Tarja; Rolova, Taisia; Pollari, Eveliina; Valonen, Piia; Lehtonen, Šárka; Jantunen, Esa; Aarnio, Jussi; Lehenkari, Petri; Koistinaho, Milla; Muona, Anu; Koistinaho, Jari

2012-01-01

357

Simplexide Induces CD1d-Dependent Cytokine and Chemokine Production from Human Monocytes  

PubMed Central

Monocytes are major effector cells of innate immunity and recognize several endogenous and exogenous molecules due to the expression of wide spectrum of receptors. Among them, the MHC class I-like molecule CD1d interacts with glycolipids and presents them to iNKT cells, mediating their activation. Simplexide belongs to a novel class of glycolipids isolated from marine sponges and is structurally distinct from other immunologically active glycolipids. In this study we have examined the effects of simplexide on cytokine and chemokine release from human monocytes. Simplexide induces a concentration- and time-dependent release of IL-6, CXCL8, TNF-? and IL-10 and increases the expression of IL6, CXCL8 and IL10 mRNA. Cytokine and chemokine release induced by simplexide from monocytes is dependent on CD1d since: i) a CD1d antagonist, 1,2-bis (diphenylphosphino) ethane [DPPE]- polyethylene glycolmonomethylether [PEG], specifically blocks simplexide-induced activation of monocytes; ii) CD1d knockdown inhibits monocyte activation by simplexide and iii) simplexide induces cytokine production from CD1d-transfected but not parental C1R cell line Finally, we have shown that simplexide also induces iNKT cell expansion in vitro. Our results demonstrate that simplexide, apart from activating iNKT cells, induces the production of cytokines and chemokines from human monocytes by direct interaction with CD1d. PMID:25390653

Loffredo, Stefania; Staiano, Rosaria I.; Granata, Francescopaolo; Costantino, Valeria; Borriello, Francesco; Frattini, Annunziata; Lepore, Maria Teresa; Mangoni, Alfonso; Marone, Gianni; Triggiani, Massimo

2014-01-01

358

Chicken CD300a homolog is found on B lymphocytes, various leukocytes populations and binds to phospholipids.  

PubMed

The chicken CD300 cluster contains three genes that encode inhibitory, activating and soluble forms. In the present study, we have generated a monoclonal antibody against the inhibitory CD300L-B1 molecule. The mab 1D4 was specific for the CD300L-B1 form and showed no crossreactivity with the related CD300L-X1. Virtually all bursal cells expressed CD300L-B1, whereas only a small positive subset was found in thymus that was identified as thymic B cell subpopulation. In peripheral tissues, CD300L-B1 was found to be expressed on lymphocyte subpopulations in blood and spleen. Double immunofluorescence analysis with B- and T-cell specific markers identified these subsets as B lymphocytes. In addition, analysis of PBMC revealed that CD300L-B1 was also present on monocytes, heterophils, blood NK cells and in vitro differentiated macrophages. We utilized a reporter cell line in order to identify potential ligands of CD300L-B1. When several phospholipids were tested, only phosphatidylserine and phosphatidylethanolamine were found to trigger strong reaction of the reporter cells. The two phospholipids elicited a response only in CD300L-B1 reporter cells, but not in CD300L-X1 reporter cells. Moreover the interaction could be blocked with the specific mab. In conclusion, we provide evidence for the expression of chicken CD300L-B1 on immature and mature B cells, monocytes, heterophils, macrophages and NK cells and identify phosphatidylserine and phosphatidylethanolamine as CD300L-B1 ligands. PMID:25681077

Sperling, Beatrice; Viertlboeck, Birgit C; Göbel, Thomas W

2015-06-01

359

Treatment of Chronic Lymphocytic Leukemia by Risk Group  

MedlinePLUS

... lymphocytic leukemia treated? Chemotherapy for chronic lymphocytic leukemia Monoclonal antibodies for chronic lymphocytic leukemia Targeted therapy for chronic lymphocytic leukemia Surgery for chronic lymphocytic ...

360

In vivo tracking and immunological properties of pulsed porcine monocyte-derived dendritic cells.  

PubMed

Cellular therapies using immune cells and in particular dendritic cells (DCs) are being increasingly applied in clinical trials and vaccines. Their success partially depends on accurate delivery of cells to target organs or migration to lymph nodes. Delivery and subsequent migration of cells to regional lymph nodes is essential for effective stimulation of the immune system. Thus, the design of an optimal DC therapy would be improved by optimizing technologies for monitoring DC trafficking. Magnetic resonance imaging (MRI) represents a powerful tool for non-invasive imaging of DC migration in vivo. Domestic pigs share similarities with humans and represent an excellent animal model for immunological studies. The aim of this study was to investigate the possibility using pigs as models for DC tracking in vivo. Porcine monocyte derived DC (MoDC) culture with superparamagnetic iron oxide (SPIO) particles was standardized on the basis of SPIO concentration and culture viability. Phenotype, cytokine production and mixed lymphocyte reaction assay confirmed that porcine SPIO-MoDC culture were similar to mock MoDCs and fully functional in vivo. Alike, similar patterns were obtained in human MoDCs. After subcutaneous inoculation in pigs, porcine SPIO-MoDC migration to regional lymph nodes was detected by MRI and confirmed by Perls staining of draining lymph nodes. Moreover, after one dose of virus-like particles-pulsed MoDCs specific local and systemic responses were confirmed using ELISPOT IFN-? in pigs. In summary, the results in this work showed that after one single subcutaneous dose of pulsed MoDCs, pigs were able to elicit specific local and systemic immune responses. Additionally, the dynamic imaging of MRI-based DC tracking was shown using SPIO particles. This proof-of-principle study shows the potential of using pigs as a suitable animal model to test DC trafficking with the aim of improving cellular therapies. PMID:25282042

Crisci, Elisa; Fraile, Lorenzo; Novellas, Rosa; Espada, Yvonne; Cabezón, Raquel; Martínez, Jorge; Cordoba, Lorena; Bárcena, Juan; Benitez-Ribas, Daniel; Montoya, María

2015-02-01

361

Age-associated telomere attrition of lymphocytes in vivo is co-ordinated with changes in telomerase activity, composition of lymphocyte subsets and health conditions.  

PubMed

Telomeres are essential in maintaining chromosome integrity and in controlling cellular replication. Attrition of telomere length in peripheral blood mononuclear cells (PBMCs) with age is well documented from cross-sectional studies. But the actual in vivo changes in telomere lengths and its relationship with the contributing factors within the individuals with age have not been fully addressed. In the present paper, we report a longitudinal analysis of telomere length in the PBMCs, lymphocytes and monocytes of 216 human subjects aged from 20-90 years assessed at 0-, 5- and 12-year follow-up. For the 5- and 12-year follow-up, telomere length in the PBMCs decreased in 34% and 46%, exhibited no detectable change in 56% and 47% and increased in 10% and 7% of the subjects respectively. The rate of telomere change was distinct for T-cells, B-cells and monocytes for any given subject. Telomerase activity declined with age in the resting T-cells and B-cells and the activated T-cells. Finally, a significant portion of telomere attrition in T-cells with age was explained by a decline in the telomerase activity, decreased naïve cells and the change in physiological conditions such as elevated blood glucose and interleukin (IL)-6 levels. These findings show that changes in the telomere length of the PBMCs with age in vivo occur at different rates in different individuals and cell types and reveal that changes in the telomere length in the T-cells with age is influenced by the telomerase activity, naïve T-cell percentage and changes in health conditions. PMID:25317735

Lin, Yun; Damjanovic, Amanda; Metter, E Jeffrey; Nguyen, Huy; Truong, Thai; Najarro, Kevin; Morris, Christa; Longo, Dan L; Zhan, Ming; Ferrucci, Luigi; Hodes, Richard J; Weng, Nan-ping

2015-03-01

362

Analysis of the histamine H2-receptor in human monocytes.  

PubMed

Histamine receptors are G-protein-coupled receptors (GPCRs). Canonically, the histamine H2-receptor (H2R) couples to Gs-proteins and activates adenylyl cyclases (ACs) with subsequent adenosine-3',5'-cyclic monophosphate (cAMP) generation. Recently, the classic two-state model describing GPCR activation has been extended to a multiple-state model implying that any ligand stabilizes a ligand-specific receptor conformation, also referred to as functional selectivity. In our present study we pharmacologically characterized the H2R in human monocytes. We found dissociations in the effects of histamine (HA) and H2R agonists on cAMP accumulation and inhibition of formyl peptide-induced production of reactive oxygen species (ROS). In addition, we excluded participation of protein kinase A (PKA) in HA-induced ROS inhibition. Comparison of the potencies and efficacies of H2R agonists in monocytes, neutrophils and eosinophils unmasked cell type-specific pharmacological profiles of individual ligands. Taken together, our data extend the concept of functional selectivity to the H2R in human monocytes and demonstrate striking cell-type specificity in the pharmacological profile of the H2R. PMID:25199456

Werner, Kristin; Neumann, Detlef; Seifert, Roland

2014-11-15

363

A phase 1 study evaluating the safety and tolerability of otlertuzumab, an anti-CD37 mono-specific ADAPTIR therapeutic protein in chronic lymphocytic leukemia  

PubMed Central

Otlertuzumab is a novel humanized anti-CD37 protein therapeutic. This study evaluated the safety of otlertuzumab administered intravenously to patients with chronic lymphocytic leukemia (CLL). Otlertuzumab was administered weekly for up to 8 weeks followed by 1 dose per month for 4 months ranging from 0.03 to 20 mg/kg in the dose-escalation phase and 10 to 30 mg/kg in the dose-expansion phase. Responses were determined by using the 1996 National Cancer Institute (NCI-96) and 2008 International Workshop on Chronic Lymphocytic Leukaemia (IWCLL) criteria. Fifty-seven patients were treated in the dose-escalation phase and 26 in the dose-expansion phase. A maximum-tolerated dose was not identified. Response occurred in 19 (23%) of 83 treated patients by NCI-96 criteria. All responses were partial and occurred more commonly in patients with symptomatic untreated CLL (6/7) or 1 to 2 prior therapies (12/28) vs 3 or more therapies (1/48). Twenty percent (12/61) with serial computed tomography scan assessment had a response per IWCLL criteria. The most frequent adverse events were infusion reactions, fatigue, nausea, and diarrhea and were not dose related. Otlertuzumab was well tolerated, and modest clinical activity was observed. Otlertuzumab warrants further evaluation in combination with other agents for the treatment of CLL. This trial was registered at www.clinicaltrials.gov as #NCT00614042. PMID:24381226

Pagel, John M.; Awan, Farrukh T.; Forero, Andres; Flinn, Ian W.; Deauna-Limayo, Delva P.; Spurgeon, Stephen E.; Andritsos, Leslie A.; Gopal, Ajay K.; Leonard, John P.; Eisenfeld, Amy J.; Bannink, Jeannette E.; Stromatt, Scott C.; Furman, Richard R.

2014-01-01

364

Microgravity and immunity: Changes in lymphocyte gene expression  

Microsoft Academic Search

Earlier studies had shown that modeled and true microgravity MG cause multiple direct effects on human lymphocytes MG inhibits lymphocyte locomotion suppresses polyclonal and antigen-specific activation affects signal transduction mechanisms as well as activation-induced apoptosis In this study we assessed changes in gene expression associated with lymphocyte exposure to microgravity in an attempt to identify microgravity-sensitive genes MGSG in general

D. Risin; N. E. Ward; S. A. Risin; N. R. Pellis

2006-01-01

365

Enhanced Monocyte Response and Decreased Central Memory T Cells in Children with Invasive Staphylococcus aureus Infections  

PubMed Central

Staphylococcus aureus has emerged as a significant pathogen causing severe invasive disease in otherwise healthy people. Despite considerable advances in understanding the epidemiology, resistance mechanisms, and virulence factors produced by the bacteria, there is limited knowledge of the in vivo host immune response to acute, invasive S. aureus infections. Herein, we report that peripheral blood mononuclear cells from patients with severe S. aureus infections demonstrate a distinctive and robust gene expression profile which is validated in a distinct group of patients and on a different microarray platform. Application of a systems-wide modular analysis framework reveals significant over-expression of innate immunity genes and under-expression of genes related to adaptive immunity. Simultaneous flow cytometry analyses demonstrated marked alterations in immune cell numbers, with decreased central memory CD4 and CD8 T cells and increased numbers of monocytes. CD14+ monocyte numbers significantly correlated with the gene expression levels of genes related to the innate immune response. These results demonstrate the value of applying a systems biology approach that reveals the significant alterations in the components of circulating blood lymphocytes and monocytes in invasive S. aureus infections. PMID:19424507

Ardura, Monica I.; Banchereau, Romain; Mejias, Asuncion; Di Pucchio, Tiziana; Glaser, Casey; Allantaz, Florence; Pascual, Virginia; Banchereau, Jacques; Chaussabel, Damien; Ramilo, Octavio

2009-01-01

366

Potent Antitumor Effects of Combination Therapy With IFNs and Monocytes in Mouse Models of Established Human Ovarian and Melanoma Tumors  

PubMed Central

Interferon-activated monocytes are known to exert cytocidal activity against tumor cells in vitro. Here, we have examined whether a combination of IFN-?2a and IFN-? and human monocytes mediate significant antitumor effects against human ovarian and melanoma tumor xenografts in mouse models. OVCAR-3 tumors were treated i.t. with monocytes alone, IFN-?2a and IFN-? alone or combination of all three on day 0, 15 or 30 post-tumor implantation. Mice receiving combination therapy beginning day 15 showed significantly reduced tumor growth and prolonged survival including complete regression in 40% mice., Tumor volumes measured on day 80 in mice receiving combination therapy (206 mm3) were significantly smaller than those of mice receiving the IFNs alone (1041 mm3), monocytes alone (1111 mm3) or untreated controls (1728 mm3). Similarly, combination therapy with monocytes and IFNs of much larger tumor also inhibited OVCAR-3 tumor growth. Immunohistochemistry studies showed a large number of activated macrophages (CD31+/CD68+) infiltrating into OVCAR-3 tumors and higher densities of IL-12, IP10 and NOS2, markers of M1 (classical) macrophages in tumors treated with combination therapy compared to the controls. Interestingly, IFNs activated macrophages induced apoptosis of OVCAR-3 tumor cells as monocytes alone or IFNs alone did not mediate significant apoptosis. Similar antitumor activity was observed in the LOX melanoma mouse model, but not as profound as seen with the OVCAR-3 tumors. Administration of either mixture of monocytes and IFN-?2a or monocytes and IFN-? did not inhibit Lox melanoma growth; however a significant inhibition was observed when tumors were treated with a mixture of monocytes, IFN-?2a and IFN-?. These results indicate that monocytes and both IFN-?2a and IFN-? may be required to mediate profound antitumor effect against human ovarian and melanoma tumors in mouse models. PMID:22159517

Nakashima, Hideyuki; Miyake, Kotaro; Clark, Christopher R; Bekisz, Joseph; Finbloom, Joel; Husain, Syed R.; Baron, Samuel; Puri, Raj K.; Zoon, Kathryn C.

2012-01-01

367

Brugia malayi Microfilariae Induce a Regulatory Monocyte/Macrophage Phenotype That Suppresses Innate and Adaptive Immune Responses  

PubMed Central

Background Monocytes and macrophages contribute to the dysfunction of immune responses in human filariasis. During patent infection monocytes encounter microfilariae in the blood, an event that occurs in asymptomatically infected filariasis patients that are immunologically hyporeactive. Aim To determine whether blood microfilariae directly act on blood monocytes and in vitro generated macrophages to induce a regulatory phenotype that interferes with innate and adaptive responses. Methodology and principal findings Monocytes and in vitro generated macrophages from filaria non-endemic normal donors were stimulated in vitro with Brugia malayi microfilarial (Mf) lysate. We could show that monocytes stimulated with Mf lysate develop a defined regulatory phenotype, characterised by expression of the immunoregulatory markers IL-10 and PD-L1. Significantly, this regulatory phenotype was recapitulated in monocytes from Wuchereria bancrofti asymptomatically infected patients but not patients with pathology or endemic normals. Monocytes from non-endemic donors stimulated with Mf lysate directly inhibited CD4+ T cell proliferation and cytokine production (IFN-?, IL-13 and IL-10). IFN-? responses were restored by neutralising IL-10 or PD-1. Furthermore, macrophages stimulated with Mf lysate expressed high levels of IL-10 and had suppressed phagocytic abilities. Finally Mf lysate applied during the differentiation of macrophages in vitro interfered with macrophage abilities to respond to subsequent LPS stimulation in a selective manner. Conclusions and significance Conclusively, our study demonstrates that Mf lysate stimulation of monocytes from healthy donors in vitro induces a regulatory phenotype, characterized by expression of PD-L1 and IL-10. This phenotype is directly reflected in monocytes from filarial patients with asymptomatic infection but not patients with pathology or endemic normals. We suggest that suppression of T cell functions typically seen in lymphatic filariasis is caused by microfilaria-modulated monocytes in an IL-10-dependent manner. Together with suppression of macrophage innate responses, this may contribute to the overall down-regulation of immune responses observed in asymptomatically infected patients. PMID:25275395

Venugopal, Gopinath; Rao, Gopala B.; Lucius, Richard; Srikantam, Aparna; Hartmann, Susanne

2014-01-01

368

Divergent Dose-related Effects of -y-InterferonTherapy on in Vitro Antibody dependent Cellular and Nonspecific Cytotoxicity by Human Peripheral Blood Monocytes  

Microsoft Academic Search

Twenty-seven patients with advanced gastrointestinal malignancies received recombinant 7-interferon (rIFN-7, Biogen) prior to treatment with the murine monoclonal antibody 17-1A (Centocor), which mediates human monocyte antibody-dependent cellular cytotoxicity (ADCC). rIlN-7 was used because it enhances human monocyte Fc receptor expression, nonspecific monocyte cytotoxicity (NSMC) and ADCC in vitro. The study was designed to identify a rIFN-7 dose with acceptable toxicities

Louis M. Weiner; Zenon Steplewski; Hilary Koprowski; Samuel Litwin; Robert L. Comis

369

Truncated thioredoxin (Trx80) induces differentiation of human CD14 monocytes into a novel cell type (TAMs) via activation of the MAP kinases p38, ERK, and JNK  

Microsoft Academic Search

Thioredoxin truncated at its carboxy ter- minal (Trx80) acts as a cytokine that stimu- lates monocytes and eosinophils. In the present study, Trx80 was shown to in- duce differentiation of human CD14 monocytes into a cell type not described previously, which we designate as Trx80- activated monocytes (TAMs). TAMs re- semble immature dendritic cells (iDCs) generated in the presence of

Klas Pekkari; Mohammad Taghi Goodarzi; Annika Scheynius; Arne Holmgren; Javier Avila-Carino

2005-01-01

370

Blockade of PSGL-1 attenuates CD14+ monocytic cell recruitment in intestinal mucosa and ameliorates ileitis in SAMP1\\/Yit mice  

Microsoft Academic Search

The pathogenesis of Crohn's disease (CD) is not known. However, monocytes and macrophages are thought to play important roles in the development of mucosal inflammation. Therefore, in this study, we examined the role of monocyte-endothelial cell interactions in senes- cence-accelerated mouse P1 (SAMP1)\\/Yit mice, a murine model of spontaneous ileitis. Fluores- cence-labeled CD14 monocytic cells isolated from the spleen and

Takuya Inoue; Yoshikazu Tsuzuki; Koji Matsuzaki; Hisayuki Matsunaga; Junichi Miyazaki; Ryota Hokari; Yoshikiyo Okada; Atsushi Kawaguchi; Shigeaki Nagao; Kazuro Itoh; Satoshi Matsumoto; Soichiro Miura

2004-01-01

371

A morphological and immunohistochemical study of the effects of prednisolone or ursodeoxycholic acid on liver histology in feline lymphocytic cholangitis.  

PubMed

Feline lymphocytic cholangitis (LC) has been commonly treated with prednisolone, and more recently with ursodeoxycholic acid (UDCA). Previously, we found that prednisolone treatment resulted in a statistically longer survival time than treatment with UDCA. In order to explain this difference, we compared the effects of prednisolone and UDCA treatment on hepatic tissue by evaluating consecutive liver biopsies. Archival serial biopsy materials from cats with LC treated with prednisolone (n = 5) or UDCA (n = 4) were evaluated. We employed haematoxylin and eosin staining to evaluate inflammation, and reticulin staining for fibrosis. Immunohistochemical stainings for Ki-67, K19 (Cytokeratin 19) and ?-smooth muscle actin were used to evaluate cell type-specific proliferation and activation of hepatic stellate cells. Inflammation decreased more in the group treated with prednisolone, while the number of cholangiocytes, progenitor cells and fibroblasts did not differ between the treatment groups. Additionally, no difference was found for the amount of fibrosis in both treatment groups. PMID:24496321

Otte, Corma Ma; Rothuizen, Jan; Favier, Robert P; Penning, Louis C; Vreman, Sandra

2014-10-01

372

Treatment Options by Stage (Chronic Lymphocytic Leukemia)  

MedlinePLUS

... for Clinical Trials NCI Publications Español Chronic Lymphocytic Leukemia Treatment (PDQ®) Treatment Options by Stage Stage 0 Chronic Lymphocytic Leukemia Treatment of stage 0 chronic lymphocytic leukemia is ...

373

Whole Blood Activation Results in Enhanced Detection of T Cell and Monocyte Cytokine Production by Flow Cytometry  

NASA Technical Reports Server (NTRS)

An excellent monitor of the immune balance of peripheral circulating cells is to determine their cytokine production patterns in response to stimuli. Using flow cytometry a positive identification of cytokine producing cells in a mixed culture may be achieved. Recently, the ability to assess cytokine production following a wholeblood activation culture has been described. We compared whole blood culture to standard PBMC culture and determined the individual cytokine secretion patterns for both T cells and monocytes via flow cytometry. For T cells cytokine assessment following PMA +ionomycin activation: (1) a significantly greater percentages of T cells producing IFNgamma and IL-2 were observed following whole-blood culture; (2) altered T cell cytokine production kinetics were observed by varying whole blood culture times. In addition, a four-color cytometric analysis was used to allow accurate phenotyping and quantitation of cytokine producing lymphocyte populations. Using this technique we found IFNgamma production to be significantly elevated in the CD3+/CD8+ T cell population as compared to the CD3+/CD8- population following five hours of whole blood activation. Conversely, IL-2 and IL-10 production were significantly elevated in the CD3+/CD8- T cell population as compared to the CD3+/CD8+ population. Monocyte cytokine production was assessed in both culture systems following LPS activation for 24 hours. A three-color flow cytometric was used to assess two cytokines in conjunction with CD 14. The cytokine pairs used for analysis were IL-1a/IL-12, and IL-10ITNFa. Nearly all monocytes were stimulated to produce IL-1a, IL-12 and TNFalpha equally well in both culture systems. Monocyte production of IL-10 was significantly elevated following whole blood culture as compared to PBMC culture. IL-12 producing monocytes appeared to be a distinct subpopulation of the IL-1a producing set, whereas IL-10 and TNFa producing monocytes were largely mutually exclusive. IL-10 and TNFa producing monocytes may represent functionally different monocyte subsets with distinct functions. Whole blood culture eliminates the need to purify cell populations prior to culture and may have significant utility for the routine monitoring of the cytokine balances of the peripheral blood T cell and monocyte populations. In addition, there are distinct advantages to performing whole-blood (WB) activation as compared to PBMC activation. These advantages would include retaining all various cell-cell interactions as well as any soluble factors present in serum that influence cell activation. It is likely that the altered cytokine production observed following whole blood culture more accurately represents the in-vivo immune balance.

Sams, Clarence F.; Crucian, Brian E.

2001-01-01

374

Cyclophosphamide, Alvocidib, and Rituximab in Treating Patients With High Risk B-Cell Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma  

ClinicalTrials.gov

Chronic Lymphocytic Leukemia; Prolymphocytic Leukemia; Recurrent Small Lymphocytic Lymphoma; Refractory Chronic Lymphocytic Leukemia; Stage I Chronic Lymphocytic Leukemia; Stage I Small Lymphocytic Lymphoma; Stage II Chronic Lymphocytic Leukemia; Stage II Small Lymphocytic Lymphoma; Stage III Chronic Lymphocytic Leukemia; Stage III Small Lymphocytic Lymphoma; Stage IV Chronic Lymphocytic Leukemia; Stage IV Small Lymphocytic Lymphoma

2015-04-09

375

Polyclonal activation of lymphocytes.  

PubMed

Literary data (48 references) on the phenomenon of polyclonal activation (PA) of lymphocytes are analysed and PA inductors of various nature are classified. A new trend in the study of PA is pointed out--the recording of nonspecific reactions to not only exogenous, but also endogenous antigens (mostly autologous erythrocytes and DNA). The problems of the mechanism of PA, the role of the normal autoimmune system, T-cells and macrophages, increased synthesis of specific and nonspecific immunoglobulins and cell proliferation are discussed. The great protective significance of PA as the quickest humoral reaction of the organism on the intrusion of antigenic products or their endogenous synthesis is emphasized. The possibility of using PA for the characterization of the function of B-cells and the normal system of autoimmunity is pointed out. In the study of PA, a standard complex of antigens should be used which should invariably include the cells of microbial autoflora of the body as well as tissue antigens for the detection of autoimmune reaction. PMID:3534084

Klemparskaya, N N; Ulanova, A M

1986-01-01

376

Quantifying T Lymphocyte Turnover  

PubMed Central

Peripheral T cell populations are maintained by production of naive T cells in the thymus, clonal expansion of activated cells, cellular self-renewal (or homeostatic proliferation), and density dependent cell life spans. A variety of experimental techniques have been employed to quantify the relative contributions of these processes. In modern studies lymphocytes are typically labeled with 5-bromo-2?-deoxyuridine (BrdU), deuterium, or the fluorescent dye carboxy-fluorescein diacetate succinimidyl ester (CFSE), their division history has been studied by monitoring telomere shortening and the dilution of T cell receptor excision circles (TRECs) or the dye CFSE, and clonal expansion has been documented by recording changes in the population densities of antigen specific cells. Proper interpretation of such data in terms of the underlying rates of T cell production, division, and death has proven to be notoriously difficult and involves mathematical modeling. We review the various models that have been developed for each of these techniques, discuss which models seem most appropriate for what type of data, reveal open problems that require better models, and pinpoint how the assumptions underlying a mathematical model may influence the interpretation of data. Elaborating various successful cases where modeling has delivered new insights in T cell population dynamics, this review provides quantitative estimates of several processes involved in the maintenance of naive and memory, CD4+ and CD8+ T cell pools in mice and men. PMID:23313150

De Boer, Rob J.; Perelson, Alan S.

2013-01-01

377

Aryl hydrocarbon mono-oxygenase activity in human lymphocytes  

SciTech Connect

Aryl hydrocarbon mono-oxygenase (AHM), an enzyme of key importance in metabolism of xenobiotic chemicals such as polynuclear aromatic hydrocarbons (PNA), is present in human lymphocytes. Studies investing the relation of activity of AHM in human lymphocytes to parameters such as disease state, PNA exposure, in vitro mitogen stimulation, etc. have been summarized in this report. Some studies have demonstrated increased AHM activity in lymphocytes from cigarette smokers (compared to nonsmokers), and in lung cancer patients when compared to appropriate control groups. These observations are confused by extreme variability in human lymphocyte AHM activities, such variability arising from factors such as genetic variation in AHM activity, variation in in vitro culture conditions which affect AHM activity, and the problematical relationship of common AHM assays to actual PNA metabolism taking place in lymphocytes. If some of the foregoing problems can be adequately addressed, lymphocyte AHM activity could hold the promise of being a useful biomarker system for human PNA exposure.

Griffin, G.D.; Schuresko, D.D.

1981-06-01

378

Effects of isolation on various lymphocyte activities  

SciTech Connect

Prolonged exposure of Sprague Dawley male rats to isolation, water scheduling, or their combination resulted in an enhanced lymphocyte proliferative response to mitogen. Time course studies of effects of isolation on mitogenic response of splenic and/or blood T and B lymphocytes and splenic NK cell activity demonstrated a suppression with short term exposure followed by an enhancement with prolonged exposure. Use of immunoperoxidase staining techniques to identify splenic T or T helper cells revealed that prolonged exposure to isolation had no significant effect on the proportion of these cell populations in the spleen. Examination of the data by Lineweaver-Burke plot and plot of the data as % maximum response showed that prolonged exposure to isolation did not alter the sensitivity of the lymphocytes to mitogen. Involvement of corticosteroids and opioid peptides in mediation of the effects of exposure to isolation on lymphocyte activity was assessed by measurement of plasma corticosterone by radioimmunoassay and by examination of the ability of the opioid antagonist naltrexone to alter the effects of isolation on lymphocyte proliferative response to mitogen. Attempts were made to mimic the effects of short-term isolation on lymphocyte activity by morphine sulfate administration.

Jessop, J.J.

1986-01-01

379

Intravenous Infusion of Nerve Growth Factor–Secreting Monocytes Supports the Survival of Cholinergic Neurons in the Nucleus Basalis of Meynert in Hypercholesterolemia Brown–Norway Rats  

PubMed Central

The recruitment of monocytes into the brain has been implicated in Alzheimer’s disease and recent studies have indicated that monocytes can reduce amyloid plaque burden. Our previous investigations have shown that hypercholesterolemic rats develop cognitive, cholinergic, and blood–brain barrier dysfunction, but do not develop amyloid plaques. This study was designed to evaluate the effects of repeated intravenous (i.v.) infusion (via the dorsal penile vein) of primary monocytes on cognition, the cholinergic system, and cortical cytokine levels in hypercholesterolemia Brown-Norway rats. In addition, we also transduced the monocytes with nerve growth factor (NGF) to evaluate whether these cells could be used to deliver a neuroprotective agent to the brain. Our results indicate that repeated i.v. infused monocytes migrate into the brains of hypercholesterolemic rats; however