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1

Evoked potential studies in the antiphospholipid syndrome: differential diagnosis from multiple sclerosis  

PubMed Central

Background The CNS manifestations of the antiphospholipid syndrome (APS) can mimic multiple sclerosis both clinically and radiologically. Objective To compare evoked potential studies in APS patients and patients with multiple sclerosis with similar neurological disability. Methods 30 APS patients with CNS manifestations and 33 patients with definite multiple sclerosis and similar neurological disability underwent studies of visual evoked potentials (VEP), somatosensory evoked potentials (SSEP) in the upper and lower limbs (UL, LL), and sympathetic skin responses (SSR) in the upper and lower limbs. Results The neurological manifestations in the APS patients included stroke (n?=?17), transient ischaemic attacks (n?=?10), and severe headache with multiple white matter lesions on brain MRI (n?=?3). Abnormal SSEP (LL), and SSR (UL; LL) were seen in APS patients (37%, 27%, and 30%, respectively) but VEP and UL SSEP were rarely abnormal (10% and 6%, respectively in APS v 58% and 33% in multiple sclerosis; p?=?0.0005, p?=?0.008). Mean VEP latencies were more prolonged in multiple sclerosis (116?ms v 101?ms, p<0.001). Only one APS patient had abnormal findings in all three evoked potential studies, compared with seven patients in the multiple sclerosis group (p?=?0.04) Conclusions Abnormal VEPs are uncommon in APS in contrast to multiple sclerosis. Coexisting abnormalities in all other evoked potentials were similarly rare in APS. In patients with brain MRI findings compatible either with multiple sclerosis or APS, normal evoked potential tests, and especially a normal VEP, may support the diagnosis of APS.

Paran, D; Chapman, J; Korczyn, A D; Elkayam, O; Hilkevich, O; Groozman, G B; Levartovsky, D; Litinsky, I; Caspi, D; Segev, Y; Drory, V E

2006-01-01

2

Growth differentiating factor 15 enhances the tumor-initiating and self-renewal potential of multiple myeloma cells.  

PubMed

Disease relapse remains a major factor limiting the survival of cancer patients. In the plasma cell malignancy multiple myeloma (MM), nearly all patients ultimately succumb to disease relapse and progression despite new therapies that have improved remission rates. Tumor regrowth indicates that clonogenic growth potential is continually maintained, but the determinants of self-renewal in MM are not well understood. Normal stem cells are regulated by extrinsic niche factors, and the tumor microenvironment (TME) may similarly influence tumor cell clonogenic growth and self-renewal. Growth differentiation factor 15 (GDF15) is aberrantly secreted by bone marrow stromal cells (BMSCs) in MM. We found that GDF15 is produced by BMSCs after direct contact with plasma cells and enhances the tumor-initiating potential and self-renewal of MM cells in a protein kinase B- and SRY (sex-determining region Y)-box-dependent manner. Moreover, GDF15 induces the expansion of MM tumor-initiating cells (TICs), and changes in the serum levels of GDF15 were associated with changes in the frequency of clonogenic MM cells and the progression-free survival of MM patients. These findings demonstrate that GDF15 plays a critical role in mediating the interaction among mature tumor cells, the TME, and TICs, and strategies targeting GDF15 may affect long-term clinical outcomes in MM. PMID:24345755

Tanno, Toshihiko; Lim, Yiting; Wang, Qiuju; Chesi, Marta; Bergsagel, P Leif; Matthews, Geoff; Johnstone, Ricky W; Ghosh, Nilanjan; Borrello, Ivan; Huff, Carol Ann; Matsui, William

2014-01-30

3

Label-free morphology-based prediction of multiple differentiation potentials of human mesenchymal stem cells for early evaluation of intact cells.  

PubMed

Precise quantification of cellular potential of stem cells, such as human bone marrow-derived mesenchymal stem cells (hBMSCs), is important for achieving stable and effective outcomes in clinical stem cell therapy. Here, we report a method for image-based prediction of the multiple differentiation potentials of hBMSCs. This method has four major advantages: (1) the cells used for potential prediction are fully intact, and therefore directly usable for clinical applications; (2) predictions of potentials are generated before differentiation cultures are initiated; (3) prediction of multiple potentials can be provided simultaneously for each sample; and (4) predictions of potentials yield quantitative values that correlate strongly with the experimental data. Our results show that the collapse of hBMSC differentiation potentials, triggered by in vitro expansion, can be quantitatively predicted far in advance by predicting multiple potentials, multi-lineage differentiation potentials (osteogenic, adipogenic, and chondrogenic) and population doubling potential using morphological features apparent during the first 4 days of expansion culture. In order to understand how such morphological features can be effective for advance predictions, we measured gene-expression profiles of the same early undifferentiated cells. Both senescence-related genes (p16 and p21) and cytoskeleton-related genes (PTK2, CD146, and CD49) already correlated to the decrease of potentials at this stage. To objectively compare the performance of morphology and gene expression for such early prediction, we tested a range of models using various combinations of features. Such comparison of predictive performances revealed that morphological features performed better overall than gene-expression profiles, balancing the predictive accuracy with the effort required for model construction. This benchmark list of various prediction models not only identifies the best morphological feature conversion method for objective potential prediction, but should also allow clinicians to choose the most practical morphology-based prediction method for their own purposes. PMID:24705458

Sasaki, Hiroto; Takeuchi, Ichiro; Okada, Mai; Sawada, Rumi; Kanie, Kei; Kiyota, Yasujiro; Honda, Hiroyuki; Kato, Ryuji

2014-01-01

4

Label-Free Morphology-Based Prediction of Multiple Differentiation Potentials of Human Mesenchymal Stem Cells for Early Evaluation of Intact Cells  

PubMed Central

Precise quantification of cellular potential of stem cells, such as human bone marrow–derived mesenchymal stem cells (hBMSCs), is important for achieving stable and effective outcomes in clinical stem cell therapy. Here, we report a method for image-based prediction of the multiple differentiation potentials of hBMSCs. This method has four major advantages: (1) the cells used for potential prediction are fully intact, and therefore directly usable for clinical applications; (2) predictions of potentials are generated before differentiation cultures are initiated; (3) prediction of multiple potentials can be provided simultaneously for each sample; and (4) predictions of potentials yield quantitative values that correlate strongly with the experimental data. Our results show that the collapse of hBMSC differentiation potentials, triggered by in vitro expansion, can be quantitatively predicted far in advance by predicting multiple potentials, multi-lineage differentiation potentials (osteogenic, adipogenic, and chondrogenic) and population doubling potential using morphological features apparent during the first 4 days of expansion culture. In order to understand how such morphological features can be effective for advance predictions, we measured gene-expression profiles of the same early undifferentiated cells. Both senescence-related genes (p16 and p21) and cytoskeleton-related genes (PTK2, CD146, and CD49) already correlated to the decrease of potentials at this stage. To objectively compare the performance of morphology and gene expression for such early prediction, we tested a range of models using various combinations of features. Such comparison of predictive performances revealed that morphological features performed better overall than gene-expression profiles, balancing the predictive accuracy with the effort required for model construction. This benchmark list of various prediction models not only identifies the best morphological feature conversion method for objective potential prediction, but should also allow clinicians to choose the most practical morphology-based prediction method for their own purposes.

Sasaki, Hiroto; Takeuchi, Ichiro; Okada, Mai; Sawada, Rumi; Kanie, Kei; Kiyota, Yasujiro; Honda, Hiroyuki; Kato, Ryuji

2014-01-01

5

Differential and Common Leukemogenic Potentials of Multiple NUP98-Hox Fusion Proteins Alone or with Meis1  

PubMed Central

NUP98-Hox fusion genes are newly identified oncogenes isolated in myeloid leukemias. Intriguingly, only Abd-B Hox genes have been reported as fusion partners, indicating that they may have unique overlapping leukemogenic properties. To address this hypothesis, we engineered novel NUP98 fusions with Hox genes not previously identified as fusion partners: the Abd-B-like gene HOXA10 and two Antennepedia-like genes, HOXB3 and HOXB4. Notably, NUP98-HOXA10 and NUP98-HOXB3 but not NUP98-HOXB4 induced leukemia in a murine transplant model, which is consistent with the reported leukemogenic potential ability of HOXA10 and HOXB3 but not HOXB4. Thus, the ability of Hox genes to induce leukemia as NUP98 fusion partners, although apparently redundant for Abd-B-like activity, is not restricted to this group, but rather is determined by the intrinsic leukemogenic potential of the Hox partner. We also show that the potent leukemogenic activity of Abd-B-like Hox genes is correlated with their strong ability to block hematopoietic differentiation. Conversely, coexpression of the Hox cofactor Meis1 alleviated the requirement of a strong intrinsic Hox-transforming potential to induce leukemia. Our results support a model in which many if not all Hox genes can be leukemogenic and point to striking functional overlap not previously appreciated, presumably reflecting common regulated pathways.

Pineault, Nicolas; Abramovich, Carolina; Ohta, Hideaki; Humphries, R. Keith

2004-01-01

6

Integration of multiple signaling regulates through apoptosis the differential osteogenic potential of neural crest-derived and mesoderm-derived Osteoblasts.  

PubMed

Neural crest-derived (FOb) and mesoderm-derived (POb) calvarial osteoblasts are characterized by distinct differences in their osteogenic potential. We have previously demonstrated that enhanced activation of endogenous FGF and Wnt signaling confers greater osteogenic potential to FOb. Apoptosis, a key player in bone formation, is the main focus of this study. In the current work, we have investigated the apoptotic activity of FOb and POb cells during differentiation. We found that lower apoptosis, as measured by caspase-3 activity is a major feature of neural crest-derived osteoblast which also have higher osteogenic capacity. Further investigation indicated TGF-? signaling as main positive regulator of apoptosis in these two populations of calvarial osteoblasts, while BMP and canonical Wnt signaling negatively regulate the process. By either inducing or inhibiting these signaling pathways we could modulate apoptotic events and improve the osteogenic potential of POb. Taken together, our findings demonstrate that integration of multiple signaling pathways contribute to imparting greater osteogenic potential to FOb by decreasing apoptosis. PMID:23536803

Li, Shuli; Meyer, Nathaniel P; Quarto, Natalina; Longaker, Michael T

2013-01-01

7

Integration of Multiple Signaling Regulates through Apoptosis the Differential Osteogenic Potential of Neural Crest-Derived and Mesoderm-Derived Osteoblasts  

PubMed Central

Neural crest-derived (FOb) and mesoderm-derived (POb) calvarial osteoblasts are characterized by distinct differences in their osteogenic potential. We have previously demonstrated that enhanced activation of endogenous FGF and Wnt signaling confers greater osteogenic potential to FOb. Apoptosis, a key player in bone formation, is the main focus of this study. In the current work, we have investigated the apoptotic activity of FOb and POb cells during differentiation. We found that lower apoptosis, as measured by caspase-3 activity is a major feature of neural crest-derived osteoblast which also have higher osteogenic capacity. Further investigation indicated TGF-? signaling as main positive regulator of apoptosis in these two populations of calvarial osteoblasts, while BMP and canonical Wnt signaling negatively regulate the process. By either inducing or inhibiting these signaling pathways we could modulate apoptotic events and improve the osteogenic potential of POb. Taken together, our findings demonstrate that integration of multiple signaling pathways contribute to imparting greater osteogenic potential to FOb by decreasing apoptosis.

Li, Shuli; Meyer, Nathaniel P.; Quarto, Natalina; Longaker, Michael T.

2013-01-01

8

Multiple-symbol differential detection of MPSK  

Microsoft Academic Search

A differential detection technique for MPSK (multiple-phase shift keying), which uses a multiple-symbol observation interval, is presented, and its performance is analyzed and simulated. The technique makes use of maximum-likelihood sequence estimation of the transmitted phases rather than symbol-by-symbol detection as in the conventional differential detection. Thus, the performance of this multiple-symbol detection scheme fills the gap between conventional (two-symbol

Dariush Divsalar; M. K. Simon

1990-01-01

9

Multiple-symbol differential detection of MPSK  

NASA Technical Reports Server (NTRS)

A differential detection technique for MPSK (multiple-phase shift keying), which uses a multiple-symbol observation interval, is presented, and its performance is analyzed and simulated. The technique makes use of maximum-likelihood sequence estimation of the transmitted phases rather than symbol-by-symbol detection as in conventional differential detection. Thus, the performance of this multiple-symbol detection scheme fills the gap between conventional (two-symbol observation) differentially coherent detection of MPSK and ideal coherent of MPSK with differential encoding. The amount of improvement gained over conventional differential detection depends on the number of phases M and the number of additional symbol intervals added to the observation. What is particularly interesting is that substantial performance improvement can be obtained for only one or two additional symbol intervals of observation. The analysis and simulation results presented are for uncoded MPSK.

Divsalar, Dariush; Simon, Marvin K.

1990-01-01

10

Multiple-Symbol Differential Detection Of MPSK  

NASA Technical Reports Server (NTRS)

Multiple-symbol differential detection proposed for reception of radio-frequency signals modulated by mutliple-phase-shift keying (MPSK). Offers advantage of less complexity in not requiring equipment to acquire and track carrier signal. Performance approaches that of ideal coherent detection. Applicable to coded as well as uncoded MPSK, and to other forms of modulation.

Divsalar, Dariush; Simon, Marvin K.

1991-01-01

11

Estimating differential expression from multiple indicators  

PubMed Central

Regardless of the advent of high-throughput sequencing, microarrays remain central in current biomedical research. Conventional microarray analysis pipelines apply data reduction before the estimation of differential expression, which is likely to render the estimates susceptible to noise from signal summarization and reduce statistical power. We present a probe-level framework, which capitalizes on the high number of concurrent measurements to provide more robust differential expression estimates. The framework naturally extends to various experimental designs and target categories (e.g. transcripts, genes, genomic regions) as well as small sample sizes. Benchmarking in relation to popular microarray and RNA-sequencing data-analysis pipelines indicated high and stable performance on the Microarray Quality Control dataset and in a cell-culture model of hypoxia. Experimental-data-exhibiting long-range epigenetic silencing of gene expression was used to demonstrate the efficacy of detecting differential expression of genomic regions, a level of analysis not embraced by conventional workflows. Finally, we designed and conducted an experiment to identify hypothermia-responsive genes in terms of monotonic time-response. As a novel insight, hypothermia-dependent up-regulation of multiple genes of two major antioxidant pathways was identified and verified by quantitative real-time PCR.

Ilmjarv, Sten; Hundahl, Christian Ansgar; Reimets, Riin; Niitsoo, Margus; Kolde, Raivo; Vilo, Jaak; Vasar, Eero; Luuk, Hendrik

2014-01-01

12

Estimating differential expression from multiple indicators.  

PubMed

Regardless of the advent of high-throughput sequencing, microarrays remain central in current biomedical research. Conventional microarray analysis pipelines apply data reduction before the estimation of differential expression, which is likely to render the estimates susceptible to noise from signal summarization and reduce statistical power. We present a probe-level framework, which capitalizes on the high number of concurrent measurements to provide more robust differential expression estimates. The framework naturally extends to various experimental designs and target categories (e.g. transcripts, genes, genomic regions) as well as small sample sizes. Benchmarking in relation to popular microarray and RNA-sequencing data-analysis pipelines indicated high and stable performance on the Microarray Quality Control dataset and in a cell-culture model of hypoxia. Experimental-data-exhibiting long-range epigenetic silencing of gene expression was used to demonstrate the efficacy of detecting differential expression of genomic regions, a level of analysis not embraced by conventional workflows. Finally, we designed and conducted an experiment to identify hypothermia-responsive genes in terms of monotonic time-response. As a novel insight, hypothermia-dependent up-regulation of multiple genes of two major antioxidant pathways was identified and verified by quantitative real-time PCR. PMID:24586062

Ilmjärv, Sten; Hundahl, Christian Ansgar; Reimets, Riin; Niitsoo, Margus; Kolde, Raivo; Vilo, Jaak; Vasar, Eero; Luuk, Hendrik

2014-04-01

13

Potential Therapeutic Targets Identified in Multiple Myeloma  

Cancer.gov

Description: Researchers have identified molecular changes in multiple myeloma cells that activate an important biological pathway associated with cell growth and survival, thereby revealing potential new targets for drugs to treat this cancer. The researchers, led by a team from the NCI, have shown that malignant cells in multiple myeloma frequently harbor mutations that activate what is called the NF-kappaB signaling pathway, which plays a key role in promoting cell growth and preventing programmed cell death.

14

Lesion morphology at 7 Tesla MRI differentiates Susac syndrome from multiple sclerosis  

Microsoft Academic Search

BACKGROUND: Although an orphan disease with still obscure aetiopathogenesis, Susac syndrome has to be considered as differential diagnosis in multiple sclerosis (MS), since its clinical presentation and paraclinical features including routine magnetic resonance imaging (MRI) findings partially overlap. OBJECTIVE: We aimed to study a potential benefit of 7T MRI for (i) the differentiation between Susac syndrome and MS and (ii)

J. Wuerfel; T. Sinnecker; E. B. Ringelstein; W. Schwindt; T. Niendorf; F. Paul; I. Kleffner; J. Dorr

2012-01-01

15

PPAR-?: Therapeutic Potential for Multiple Sclerosis  

PubMed Central

The role of peroxisome proliferator-activated receptors (PPARs) in altering lipid and glucose metabolism is well established. More recent studies indicate that PPARs also play critical roles in controlling immune responses. We and others have previously demonstrated that PPAR-? agonists modulate the development of experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis (MS). This review will discuss the cellular and molecular mechanisms by which these agonists are believed to modulate disease. The therapeutic potential of PPAR-? agonists in the treatment of multiple sclerosis will also be considered.

Drew, Paul D.; Xu, Jihong; Racke, Michael K.

2008-01-01

16

Multiple-Bit Differential Detection of Offset Quadriphase Modulations  

NASA Astrophysics Data System (ADS)

Analogous to multiple-symbol differential detection of quadrature phase-shift keying (QPSK), a multiple-bit differential detection scheme is described for offset QPSK that also exhibits continuous improvement in performance with an increasing observation interval. Being derived from maximum-likelihood (ML) considerations, the proposed scheme is purported to be the most power-efficient scheme for such a modulation and detection method. Extension of the results to shaped offset QPSK also is considered.

Simon, M. K.

2002-07-01

17

Effect of Multiple Testing Adjustment in Differential Item Functioning Detection  

ERIC Educational Resources Information Center

In a typical differential item functioning (DIF) analysis, a significance test is conducted for each item. As a test consists of multiple items, such multiple testing may increase the possibility of making a Type I error at least once. The goal of this study was to investigate how to control a Type I error rate and power using adjustment…

Kim, Jihye; Oshima, T. C.

2013-01-01

18

Testing for Nonuniform Differential Item Functioning with Multiple Indicator Multiple Cause Models  

ERIC Educational Resources Information Center

In extant literature, multiple indicator multiple cause (MIMIC) models have been presented for identifying items that display uniform differential item functioning (DIF) only, not nonuniform DIF. This article addresses, for apparently the first time, the use of MIMIC models for testing both uniform and nonuniform DIF with categorical indicators. A…

Woods, Carol M.; Grimm, Kevin J.

2011-01-01

19

A multiple access technique for differential chaos shift keying  

Microsoft Academic Search

Various chaos-based digital communications techniques have been proposed recently. Among them, differential chaos shift keying (DCSK) allows the receiving end to decode the signal using noncoherent detection. This paper proposes and analyses a multiple access scheme for DCSK. A simple I-dimensional iterative map has been used to generate the chaotic signals for all users. Bit error probabilities have been derived

Francis Chi-moon Lau; M. M. Yip; C. K. Tse; S. F. Hau

2001-01-01

20

Differentiation of Self and Child Abuse Potential in Young Adulthood  

ERIC Educational Resources Information Center

The authors examine the role of Bowen family systems theory in predicting physical child abuse potential. Relations between differentiation of self, perceptions of personal problem-solving skills, and child abuse potential were tested in a sample of 210 single young adults who were not yet parents. Greater differentiation of self that is, lower…

Skowron, Elizabeth A.; Platt, Lisa F.

2005-01-01

21

Multiple valued floating potentials of Langmuir probes  

NASA Technical Reports Server (NTRS)

It is shown that Langmuir probes can have three different floating potentials in plasmas produced by a hot filament discharge in a multi-dipole device when the primary and secondary electron currents are comparable. The measured floating potential depends on the probe's initial condition - the most negative and the least negative potentials are found to be stable and the in-between value is found to be unstable. Results are compared to a simple theoretical model.

Nam, Cheol-Hee; Hershkowitz, N.; Cho, M. H.; Intrator, T.; Diebold, D.

1988-01-01

22

Multiple Differential-Amplifier MMICs Embedded in Waveguides  

NASA Technical Reports Server (NTRS)

Compact amplifier assemblies of a type now being developed for operation at frequencies of hundreds of gigahertz comprise multiple amplifier units in parallel arrangements to increase power and/or cascade arrangements to increase gains. Each amplifier unit is a monolithic microwave integrated circuit (MMIC) implementation of a pair of amplifiers in differential (in contradistinction to single-ended) configuration. Heretofore, in cascading amplifiers to increase gain, it has been common practice to interconnect the amplifiers by use of wires and/or thin films on substrates. This practice has not yielded satisfactory results at frequencies greater than 200 Hz, in each case, for either or both of two reasons: Wire bonds introduce large discontinuities. Because the interconnections are typically tens of wavelengths long, any impedance mismatches give rise to ripples in the gain-vs.-frequency response, which degrade the performance of the cascade.

Kangaslahti, Pekka; Schlecht, Erich

2010-01-01

23

Visual and somatosensory evoked cortical potentials in multiple sclerosis.  

PubMed Central

The diagnostic value of the pattern reversal evoked cortical potential (VEP) and the somatosensory evoked cortical potential (SEP) has been compared in 50 patients with established or suspected multiple sclerosis. A prolonged latency of VEP was found in 96% of definite cases of multiple sclerosis, 58% of probable cases, and 20% of possible cases. A prolonged latency of SEP by stimulation of median or peroneal nerves or both was found in 86% of definite cases of multiple sclerosis, 83% of probable cases, and 50% of possibe cases. When combining the results of all three tests the diagnostic yield increased to 100%, 92%, and 50%, respectively.

Trojaborg, W; Petersen, E

1979-01-01

24

Pudendal nerve somatosensory evoked potentials in probable multiple sclerosis  

Microsoft Academic Search

Bladder dysfunctions are often observed in patients with multiple sclerosis (MS). In order to evaluate their sensitivity in detecting abnormalities in bladder central control pathways, pudendal nerve somatosensory evoked potentials (pSEPs) were recorded in 16 patients with clinically probable MS: six were affected by retention or urge incontinence, and ten were asymptomatic. Conventional visual, auditory and somatosensory evoked potentials were

G. F. Sau; I. Aiello; S. Siracusano; M. Belgrano; M. Pastorino; P. Balsamo; I. Magnano; G. Rosati

1997-01-01

25

In vitro Differentiation Potential of Mesenchymal Stem Cells  

PubMed Central

Summary Mesenchymal stem cells (MSCs) represent a class of multipotent progenitor cells that have been isolated from multiple tissue sites. Of these, adipose tissue and bone marrow offer advantages in terms of access, abundance, and the extent of their documentation in the literature. This review focuses on the in vitro differentiation capability of cells derived from adult human tissue. Multiple, independent studies have demonstrated that MSCs can commit to mesodermal (adipocyte, chondrocyte, hematopoietic support, myocyte, osteoblast, tenocyte), ectodermal (epithelial, glial, neural), and endodermal (hepatocyte, islet cell) lineages. The limitations and promises of these studies in the context of tissue engineering are discussed.

Gimble, Jeffrey M.; Guilak, Farshid; Nuttall, Mark E.; Sathishkumar, Solomon; Vidal, Martin; Bunnell, Bruce A.

2008-01-01

26

Differential Space-Frequency Modulation and Fast 2-D Multiple-Symbol Differential Detection for MIMO-OFDM  

Microsoft Academic Search

The combination of differential space-frequency modulation (DSFM) with orthogonal frequency-division multiplexing (OFDM) is attractive for transmission over time-and frequency-selective multiple-input-multiple-output (MIMO) channels and detection without the need for channel-state information (CSI) at the receiver. It is well known that a simple differential detection already results in a high error floor for moderate time and frequency selectivities of the channel. A

Volker Pauli; Lutz Lampe; Johannes Huber

2008-01-01

27

The clinical potential of blood-proteomics in multiple sclerosis  

PubMed Central

Background The aetiology of multiple sclerosis (MS) remains unknown. This hampers molecular diagnosis and the discovery of bio-molecular markers. Consequently, MS diagnostic procedures are complex and criteria for assessing therapeutic efficacy are controversial, suggesting that a pathophysiological rather than an aetiological approach to the disease would be more appropriate. In this regard, blood-proteomics represents a still-unexplored tool. We investigated the potential of proteomics as applied to peripheral blood mononuclear cells (PBMCs) for differentiating treatment-naive RR-MS patients from healthy controls and from IFN-treated RR-MS patients. Methods A comparative analysis of PBMC proteins isolated from 13 unselected IFN-treated RR-MS patients, 6 IFN-untreated RR-MS patients and 14 matched healthy controls was performed using two-dimensional gel electrophoresis and MALDI-TOF mass spectrometry. We considered the volume of each spot, expressed as a percentage of the total volume of all spots in the gel. Heuristic clustering was applied to a composite population made up of a random sequence of gels from the different groups in comparison. For the differentially expressed proteins, we applied the Student's t-test to identify only those down- or up-regulated at least 2.5-fold [Ratio(R)???2.5] with respect to the homologous spots of the compared groups. Results Rho-GDI2, Rab2 and Cofilin1 were found to be associated with down-regulated and naïve group phenotypes; Cortactin and Fibrinogen beta-Chain Precursor were found to be associated with down-regulated and group-related IFN-treated RR-MS phenotypes. Thus, by means of similarity analysis, the proteomes were homogeneously segregated into three distinct groups corresponding to naive, IFN-treated and healthy control subjects. Interestingly, no separation was found between IFN-treated and healthy controls. Moreover, the molecular phenotypes were consistent with disease pathogenesis. Conclusions We demonstrated for the first time, albeit only with preliminary data, the aprioristic possibility of distinguishing naive and IFN-treated MS groups from controls, and naive from IFN-treated MS patients using a blood sample-based methodology (i.e. proteomics) alone. The functional profile of the identified molecules provides new pathophysiological insight into MS. Future development of these techniques could open up novel applications in terms of molecular diagnosis and therapy monitoring in MS patients.

2013-01-01

28

THY-1 Receptor Expression Differentiates Cardiosphere-Derived Cells with Divergent Cardiogenic Differentiation Potential  

PubMed Central

Summary Despite over a decade of intense research, the identity and differentiation potential of human adult cardiac progenitor cells (aCPC) remains controversial. Cardiospheres have been proposed as a means to expand aCPCs in vitro, but the identity of the progenitor cell within these 3D structures is unknown. We show that clones derived from cardiospheres could be subdivided based on expression of thymocyte differentiation antigen 1 (THY-1/CD90) into two distinct populations that exhibit divergent cardiac differentiation potential. One population, which is CD90+, expressed markers consistent with a mesenchymal/myofibroblast cell. The second clone type was CD90? and could form mature, functional myocytes with sarcomeres albeit at a very low rate. These two populations of cardiogenic clones displayed distinct cell surface markers and unique transcriptomes. Our study suggests that a rare aCPC exists in cardiospheres along with a mesenchymal/myofibroblast cell, which demonstrates incomplete cardiac myocyte differentiation.

Gago-Lopez, Nuria; Awaji, Obinna; Zhang, Yiqiang; Ko, Christopher; Nsair, Ali; Liem, David; Stempien-Otero, April; MacLellan, W. Robb

2014-01-01

29

A differential charge-transfer readout circuit for multiple output capacitive sensors  

Microsoft Academic Search

This paper presents a true differential, low-noise readout scheme for multiple output capacitive sensors. It overcomes the restrictions with multiple sense capacitors connected to a common node that is common in micromachined gyroscopes and multiple axis accelerometers. The architecture is easily integrated into a CMOS process, only requiring single ended operational amplifiers, transmission gates and capacitors. It also supports cancellation

Henrik Rödjegård; Anders Lööf

2005-01-01

30

Differential biocide susceptibility of the multiple genotypes of Mycobacterium immunogenum.  

PubMed

The non-tuberculous mycobacterium Mycobacterium immunogenum colonizes industrial metalworking fluids (MWFs) presumably due to its relative resistance to the currently practiced biocides and has been implicated in occupational respiratory hazards, particularly hypersensitivity pneumonitis. With an aim to understand its inherent biocide susceptibility profile and survival potential in MWF, five different genotypes of this organism, including a reference genotype (700506) and four novel test genotypes (MJY-3, MJY-4, MJY-10 and MJY-12) isolated in our recent study from diverse MWF operations were evaluated. For this, two commercial biocide formulations, Grotan (Hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine) and Kathon (5-chloro-2-methyl-4-isothiazolin-3-one) currently practiced for the control of microorganisms, including mycobacteria, in MWF operations were tested. Effect of the fluid matrix on the biocide susceptibility was investigated for the synthetic (S) and semi-synthetic (SS) MWF matrices. In general, the minimum inhibitory concentration values were higher for the HCHO-releasing biocide Grotan than the isothiazolone biocide Kathon. All genotypes (except the reference genotype) showed lower susceptibility in SS as compared to S fluid matrix for Grotan. However, in case of Kathon, a greater susceptibility was observed in SS fluid for majority of the test genotypes (MJY-3, 4 and 10). The test genotypes were more resistant than the reference genotype to either biocide in both fluid types. Furthermore, the individual genotypes showed differential biocidal susceptibility, with MJY-10 being the most resistant. These observations emphasize the importance of using the resistant genotypes of M. immunogenum as the test strains for formulation or development and evaluation of existing and novel biocides, for industrial applications. PMID:18196302

Selvaraju, Suresh B; Khan, Izhar U H; Yadav, Jagjit S

2008-03-01

31

Biophysical Characteristics Reveal Neural Stem Cell Differentiation Potential  

PubMed Central

Background Distinguishing human neural stem/progenitor cell (huNSPC) populations that will predominantly generate neurons from those that produce glia is currently hampered by a lack of sufficient cell type-specific surface markers predictive of fate potential. This limits investigation of lineage-biased progenitors and their potential use as therapeutic agents. A live-cell biophysical and label-free measure of fate potential would solve this problem by obviating the need for specific cell surface markers. Methodology/Principal Findings We used dielectrophoresis (DEP) to analyze the biophysical, specifically electrophysiological, properties of cortical human and mouse NSPCs that vary in differentiation potential. Our data demonstrate that the electrophysiological property membrane capacitance inversely correlates with the neurogenic potential of NSPCs. Furthermore, as huNSPCs are continually passaged they decrease neuron generation and increase membrane capacitance, confirming that this parameter dynamically predicts and negatively correlates with neurogenic potential. In contrast, differences in membrane conductance between NSPCs do not consistently correlate with the ability of the cells to generate neurons. DEP crossover frequency, which is a quantitative measure of cell behavior in DEP, directly correlates with neuron generation of NSPCs, indicating a potential mechanism to separate stem cells biased to particular differentiated cell fates. Conclusions/Significance We show here that whole cell membrane capacitance, but not membrane conductance, reflects and predicts the neurogenic potential of human and mouse NSPCs. Stem cell biophysical characteristics therefore provide a completely novel and quantitative measure of stem cell fate potential and a label-free means to identify neuron- or glial-biased progenitors.

Mulhall, Hayley J.; Marchenko, Steve A.; Hoettges, Kai F.; Estrada, Laura C.; Lee, Abraham P.; Hughes, Michael P.; Flanagan, Lisa A.

2011-01-01

32

Vascular calcifying progenitor cells possess bidirectional differentiation potentials.  

PubMed

Vascular calcification is an advanced feature of atherosclerosis for which no effective therapy is available. To investigate the modulation or reversal of calcification, we identified calcifying progenitor cells and investigated their calcifying/decalcifying potentials. Cells from the aortas of mice were sorted into four groups using Sca-1 and PDGFR? markers. Sca-1(+) (Sca-1(+)/PDGFR?(+) and Sca-1(+)/PDGFR?(-)) progenitor cells exhibited greater osteoblastic differentiation potentials than Sca-1(-) (Sca-1(-)/PDGFR?(+) and Sca-1(-)/PDGFR?(-)) progenitor cells. Among Sca-1(+) progenitor populations, Sca-1(+)/PDGFR?(-) cells possessed bidirectional differentiation potentials towards both osteoblastic and osteoclastic lineages, whereas Sca-1(+)/PDGFR?(+) cells differentiated into an osteoblastic lineage unidirectionally. When treated with a peroxisome proliferator activated receptor ? (PPAR?) agonist, Sca-1(+)/PDGFR?(-) cells preferentially differentiated into osteoclast-like cells. Sca-1(+) progenitor cells in the artery originated from the bone marrow (BM) and could be clonally expanded. Vessel-resident BM-derived Sca-1(+) calcifying progenitor cells displayed nonhematopoietic, mesenchymal characteristics. To evaluate the modulation of in vivo calcification, we established models of ectopic and atherosclerotic calcification. Computed tomography indicated that Sca-1(+) progenitor cells increased the volume and calcium scores of ectopic calcification. However, Sca-1(+)/PDGFR?(-) cells treated with a PPAR? agonist decreased bone formation 2-fold compared with untreated cells. Systemic infusion of Sca-1(+)/PDGFR?(-) cells into Apoe(-/-) mice increased the severity of calcified atherosclerotic plaques. However, Sca-1(+)/PDGFR?(-) cells in which PPAR? was activated displayed markedly decreased plaque severity. Immunofluorescent staining indicated that Sca-1(+)/PDGFR?(-) cells mainly expressed osteocalcin; however, activation of PPAR? triggered receptor activator for nuclear factor-?B (RANK) expression, indicating their bidirectional fate in vivo. These findings suggest that a subtype of BM-derived and vessel-resident progenitor cells offer a therapeutic target for the prevention of vascular calcification and that PPAR? activation may be an option to reverse calcification. PMID:23585735

Cho, Hyun-Ju; Cho, Hyun-Jai; Lee, Ho-Jae; Song, Myung-Kang; Seo, Ji-Yun; Bae, Yeon-Hee; Kim, Ju-Young; Lee, Hae-Young; Lee, Whal; Koo, Bon-Kwon; Oh, Byung-Hee; Park, Young-Bae; Kim, Hyo-Soo

2013-01-01

33

Monitoring of germination dynamics of multiple individual bacterial spores by multiple-trap Raman tweezers and differential interference contrast microscopy  

Microsoft Academic Search

Multiple-trap Raman tweezers and differential interference contrast microscopy were used for simultaneously monitoring the germination dynamics of multiple individual bacterial spores.codes: (350.4855) Optical tweezers or optical manipulation, (170.5660) Raman spectroscopy, 170.0180 Microscopy Optical monitoring of biological dynamics of individual living cells under physiological condition is essential to understand various events and heterogeneity among genetically identical cells. Germination is the process

Pengfei Zhang; Lingbo Kong; Peter Setlow; Yong-qing Li

2011-01-01

34

Bioenergetics and mitochondrial transmembrane potential during differentiation of cultured osteoblasts.  

PubMed

To evaluate the relationship between osteoblast differentiation and bioenergetics, cultured primary osteoblasts from fetal rat calvaria were grown in medium supplemented with ascorbate to induce differentiation. Before ascorbate treatment, the rate of glucose consumption was 320 nmol. h(-1). 10(6) cells(-1), respiration was 40 nmol. h(-1). 10(6) cells(-1), and the ratio of lactate production to glucose consumption was approximately 2, indicating that glycolysis was the main energy source for immature osteoblasts. Ascorbate treatment for 14 days led to a fourfold increase in respiration, a threefold increase in ATP production, and a fivefold increase in ATP content compared with that shown in immature cells. Confocal imaging of mitochondria stained with a transmembrane potential-sensitive vital dye showed that mature cells possessed abundant amounts of high-transmembrane-potential mitochondria, which were concentrated near the culture medium-facing surface. Acute treatment of mature osteoblasts with metabolic inhibitors showed that the rate of glycolysis rose to maintain the cellular energy supply constant. Thus progressive differentiation coincided with changes in cellular metabolism and mitochondrial activity, which are likely to play key roles in osteoblast function. PMID:11003602

Komarova, S V; Ataullakhanov, F I; Globus, R K

2000-10-01

35

Application of Differential Evolution Algorithm on Self-Potential Data  

PubMed Central

Differential evolution (DE) is a population based evolutionary algorithm widely used for solving multidimensional global optimization problems over continuous spaces, and has been successfully used to solve several kinds of problems. In this paper, differential evolution is used for quantitative interpretation of self-potential data in geophysics. Six parameters are estimated including the electrical dipole moment, the depth of the source, the distance from the origin, the polarization angle and the regional coefficients. This study considers three kinds of data from Turkey: noise-free data, contaminated synthetic data, and Field example. The differential evolution and the corresponding model parameters are constructed as regards the number of the generations. Then, we show the vibration of the parameters at the vicinity of the low misfit area. Moreover, we show how the frequency distribution of each parameter is related to the number of the DE iteration. Experimental results show the DE can be used for solving the quantitative interpretation of self-potential data efficiently compared with previous methods.

Li, Xiangtao; Yin, Minghao

2012-01-01

36

Multiple bit differential detection of offset quadrature phase-shift-keying  

NASA Technical Reports Server (NTRS)

Analogous to multiple symbol differential detectionof quadrature phase-shift-keying (QPSK), a multiple bit differential detection scheme is described for offset QPSK that also exhibits continuous improvement in performance with increasing observation interval. Being derived from maximum-likelihood (ML) considerations, the proposed scheme is purported to be the most power efficient scheme for such a modulation and detection method. Extension of the results to shaped offset QPSK is also possible.

Simon, M.

2003-01-01

37

Multiple hormone-inducible enhancers as mediators of differential transcription.  

PubMed Central

Sets of genes under a common regulatory control in a given cell type are often differentially transcribed. The possibility that this differential transcription can be modulated by the number or strength of cis-acting regulatory sequences associated with a given gene was tested by using the glucocorticoid-responsive enhancer element associated with the mouse mammary tumor virus promoter. Results indicate that differential levels of hormone-inducible gene expression can be modulated in an additive way by the number of glucocorticoid-responsive enhancers associated with this promoter. Realization of these effects shows little preference for position of the additional elements with respect to the promoter. When sequences that bind the glucocorticoid receptor in vitro with somewhat lower affinity than the enhancer were tested, these additive effects were not detected. The results support that differential transcription of genes subject to a common regulatory control can be mediated, at least in part, by the number or strength of their associated cis-acting regulatory sequences. Images

Toohey, M G; Morley, K L; Peterson, D O

1986-01-01

38

Multiple Hypnotizabilities: Differentiating the Building Blocks of Hypnotic Response  

ERIC Educational Resources Information Center

Although hypnotizability can be conceptualized as involving component subskills, standard measures do not differentiate them from a more general unitary trait, partly because the measures include limited sets of dichotomous items. To overcome this, the authors applied full-information factor analysis, a sophisticated analytic approach for…

Woody, Erik Z.; Barnier, Amanda J.; McConkey, Kevin M.

2005-01-01

39

Integrating the Revised Bloom's Taxonomy With Multiple Intelligences: A Planning Tool for Curriculum Differentiation  

ERIC Educational Resources Information Center

Both the special education and gifted education literature call for a differentiated curriculum to cater for the wide range of student differences in any classroom. Gardner's theory of multiple intelligences was integrated with the revised Bloom's taxonomy to provide a planning tool for curriculum differentiation. Teachers' progress in using the…

Noble, Toni

2004-01-01

40

Potential Application of Tregitopes as Immunomodulating Agents in Multiple Sclerosis  

PubMed Central

The induction of immunologic tolerance is an important clinical goal in autoimmunity. CD4+ regulatory T (Treg) cells, defined by the expression of the transcription factor forkhead box P3 (FoxP3), play a central role in the control of autoimmune responses. Quantitative and qualitative defects of Tregs have been postulated to contribute to failed immune regulation in multiple sclerosis (MS) and other autoimmune diseases. This paper highlights the potential uses of T regulatory cell epitopes (Tregitopes), natural Treg epitopes found to be contained in human immunoglobulins, as immunomodulating agents in MS. Tregitopes expand Treg cells and induce “adaptive Tregs” resulting in immunosuppression and, therefore, are being considered as a potential therapy for autoimmune diseases. We will compare Tregitopes versus intravenous immunoglobulin (IVIg) in the treatment of EAE with emphasis on the potential applications of Tregitope for the treatment of MS.

Elyaman, Wassim; Khoury, Samia J.; Scott, David W.; De Groot, Anne S.

2011-01-01

41

A study of impulsive multiterm fractional differential equations with single and multiple base points and applications.  

PubMed

We discuss the existence and uniqueness of solutions for initial value problems of nonlinear singular multiterm impulsive Caputo type fractional differential equations on the half line. Our study includes the cases for a single base point fractional differential equation as well as multiple base points fractional differential equation. The asymptotic behavior of solutions for the problems is also investigated. We demonstrate the utility of our work by applying the main results to fractional-order logistic models. PMID:24578623

Liu, Yuji; Ahmad, Bashir

2014-01-01

42

S band radar differential reflectivity measurements in multiple polarization planes along satellite slant paths  

NASA Technical Reports Server (NTRS)

A novel approach to making differential reflectivity measurements in multiple polarization planes has been proposed. This paper describes a versatile technique using a mechanical polarization switch and the systematic errors in differential reflectivity measurements which result. Initial results of simultaneous X band slant path measurements of attenuation and depolarization at 11.6 GHz and differential reflectivity measurements at 2.8 GHz using a slow polarization switch are presented.

Marshall, R. E.; Pratt, T.; Manus, E. A.; Stapor, D. P.; Andrews, J. H.

1984-01-01

43

A Study of Impulsive Multiterm Fractional Differential Equations with Single and Multiple Base Points and Applications  

PubMed Central

We discuss the existence and uniqueness of solutions for initial value problems of nonlinear singular multiterm impulsive Caputo type fractional differential equations on the half line. Our study includes the cases for a single base point fractional differential equation as well as multiple base points fractional differential equation. The asymptotic behavior of solutions for the problems is also investigated. We demonstrate the utility of our work by applying the main results to fractional-order logistic models.

Liu, Yuji; Ahmad, Bashir

2014-01-01

44

System for measuring multiphase flow using multiple pressure differentials  

DOEpatents

An improved method and system for measuring a multi-phase flow in a pressure flow meter. An extended throat venturi is used and pressure of the multi-phase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit. The differential pressures are then used to calculate the mass flow of the gas phase, the total mass flow, and the liquid phase. The system for determining the mass flow of the high void fraction fluid flow and the gas flow includes taking into account a pressure drop experienced by the gas phase due to work performed by the gas phase in accelerating the liquid phase.

Fincke, James R. (Idaho Falls, ID)

2003-01-01

45

Lenalidomide in multiple myeloma: Current status and future potential.  

PubMed

The clinical development of lenalidomide (Revlimid™), then pomalidomide (Actimid™) as members of immunomodulatory drugs (IMiDs) for the treatment of multiple myeloma (MM), exemplifies how insight into disease biology can lead to design of effective therapeutic agents. Increased experience and understanding of IMiD's diverse biological effects has lead to rational design of lenalidomide-based treatment-regimens over recent years. However, much about lenalidomide is yet to be understood and fully exploited. Here, we review what is known of lenalidomide's biological effects, clinical certainties and uncertainties in the treatment of MM, and explore its future potential with other synergistic therapeutic agents. PMID:22641420

Quach, Hang; Kalff, Anna; Spencer, Andrew

2012-12-01

46

Differential detection of tumor cells using a combination of cell rolling, multivalent binding, and multiple antibodies.  

PubMed

Effective quantification and in situ identification of circulating tumor cells (CTCs) in blood are still elusive because of the extreme rarity and heterogeneity of the cells. In our previous studies, we developed a novel platform that captures tumor cells at significantly improved efficiency in vitro using a unique biomimetic combination of two physiological processes: E-selectin-induced cell rolling and poly(amidoamine) (PAMAM) dendrimer-mediated strong multivalent binding. Herein, we have engineered a novel multifunctional surface, on the basis of the biomimetic cell capture, through optimized incorporation of multiple antibodies directed to cancer cell-specific surface markers, such as epithelial cell adhesion molecule (EpCAM), human epidermal growth factor receptor-2 (HER-2), and prostate specific antigen (PSA). The surfaces were tested using a series of tumor cells, MDA-PCa-2b, MCF-7, and MDA-MB-361, both in mixture in vitro and after being spiked into human blood. Our multifunctional surface demonstrated highly efficient capture of tumor cells in human blood, achieving up to 82% capture efficiency (?10-fold enhancement than a surface with the antibodies alone) and up to 90% purity. Furthermore, the multipatterned antibodies allowed differential capturing of the tumor cells. These results support that our multifunctional surface has great potential as an effective platform that accommodates virtually any antibodies, which will likely lead to clinically significant, differential detection of CTCs that are rare and highly heterogeneous. PMID:24892731

Myung, Ja Hye; Gajjar, Khyati A; Chen, Jihua; Molokie, Robert E; Hong, Seungpyo

2014-06-17

47

Differential biocide susceptibility of the multiple genotypes of Mycobacterium immunogenum  

Microsoft Academic Search

The non-tuberculous mycobacterium Mycobacterium immunogenum colonizes industrial metalworking fluids (MWFs) presumably due to its relative resistance to the currently practiced biocides\\u000a and has been implicated in occupational respiratory hazards, particularly hypersensitivity pneumonitis. With an aim to understand\\u000a its inherent biocide susceptibility profile and survival potential in MWF, five different genotypes of this organism, including\\u000a a reference genotype (700506) and four

Suresh B. Selvaraju; Izhar U. H. Khan; Jagjit S. Yadav

2008-01-01

48

Multiple benign symmetric lipomatosis -- a differential diagnosis of obesity.  

PubMed

Benign symmetrical lipomatosis (BSL), or Madelung's disease, is a rare disease characterized by the progressive growth of diffuse, painless, non-enveloped symmetric lipomas. The etiology of this disease remains unknown, although it was associated in the medical literature with alcohol and nicotine abuse, metabolic disorders and a number of malignancies. It is assumed that there is a genetic predisposition for this affliction. The management in such cases is surgical removal of the lipomas, most times in several sessions, but this is often followed by relapse. However, surgical removal of the lipomas can provide satisfactory patient functionality and cosmetic results. The differential diagnosis is made with morbid obesity, Cushing syndrome, angiolipomatosis, encapsulated lipomas, neurofibromatosis, myxoid liposarcoma, lymphoma, salivary gland disease, Frolich and lipomatosis syndrome in patients infected with HIV. The current paper reports the case of a 55 year-old man, who presented with several large lipomatous masses, arranged symmetrically on the front and back of the trunk, and several smaller lipomas in the upper and lower limbs. Treatment consisted of resection of these lipomas in several sessions, without recurrence at one year after the last operation. PMID:23958107

Ardeleanu, V; Chicos, S; Georgescu, C; Tutunaru, D

2013-01-01

49

Multiple Component Event-Related Potential (mcERP) Estimation  

NASA Technical Reports Server (NTRS)

We show how model-based estimation of the neural sources responsible for transient neuroelectric signals can be improved by the analysis of single trial data. Previously, we showed that a multiple component event-related potential (mcERP) algorithm can extract the responses of individual sources from recordings of a mixture of multiple, possibly interacting, neural ensembles. McERP also estimated single-trial amplitudes and onset latencies, thus allowing more accurate estimation of ongoing neural activity during an experimental trial. The mcERP algorithm is related to informax independent component analysis (ICA); however, the underlying signal model is more physiologically realistic in that a component is modeled as a stereotypic waveshape varying both in amplitude and onset latency from trial to trial. The result is a model that reflects quantities of interest to the neuroscientist. Here we demonstrate that the mcERP algorithm provides more accurate results than more traditional methods such as factor analysis and the more recent ICA. Whereas factor analysis assumes the sources are orthogonal and ICA assumes the sources are statistically independent, the mcERP algorithm makes no such assumptions thus allowing investigators to examine interactions among components by estimating the properties of single-trial responses.

Knuth, K. H.; Clanton, S. T.; Shah, A. S.; Truccolo, W. A.; Ding, M.; Bressler, S. L.; Trejo, L. J.; Schroeder, C. E.; Clancy, Daniel (Technical Monitor)

2002-01-01

50

Pattern visual evoked potential luminance and multiple sclerosis.  

PubMed

Pattern visual evoked potentials (PVEPs) were recorded from 111 patients classified as having possible, probable or definite multiple sclerosis. Patients were stimulated with a checkerboard pattern using high and low luminances in order to test the hypothesis that an attenuated pattern luminance increases the detection rate of PVEP abnormalities. With increasing certainty of diagnosis, there was a concomitant increase in the incidence of PVEP abnormalities. However, there was no evidence that stimulating with a lower luminance pattern enhanced the sensitivity of the test. The same findings were also apparent when the patient data was analyzed according to the presence or absence of a history of optic neuritis or other visual symptoms. It is concluded that, within the luminance limits used in this study, the role of varied luminance in detecting demyelinating lesions in the optic nerves using the PVEP is minimal, although there was some limited evidence that a high level of luminance may be more appropriate than a low level. PMID:1395053

Frith, R W; Shaw, N A; Aitcheson, F

1992-10-01

51

p53 Abnormalities and Potential Therapeutic Targeting in Multiple Myeloma  

PubMed Central

p53 abnormalities are regarded as an independent prognostic marker in multiple myeloma. Patients harbouring this genetic anomaly are commonly resistant to standard therapy. Thus, various p53 reactivating agents have been developed in order to restore its tumour suppressive abilities. Small molecular compounds, especially, have gained popularity in its efficacy against myeloma cells. For instance, promising preclinical results have steered both nutlin-3 and PRIMA-1 into phase I/II clinical trials. This review summarizes different modes of p53 inactivation in myeloma and highlights the current p53-based therapies that are being utilized in the clinic. Finally, we discuss the potential and promise that the novel small molecules possess for clinical application in improving the treatment outcome of myeloma.

Teoh, P. J.; Chng, W. J.

2014-01-01

52

PTHrP and Indian hedgehog control differentiation of growth plate chondrocytes at multiple steps.  

PubMed

In developing murine growth plates, chondrocytes near the articular surface (periarticular chondrocytes) proliferate, differentiate into flat column-forming proliferating cells (columnar chondrocytes), stop dividing and finally differentiate into hypertrophic cells. Indian hedgehog (Ihh), which is predominantly expressed in prehypertrophic cells, stimulates expression of parathyroid hormone (PTH)-related peptide (PTHrP) which negatively regulates terminal chondrocyte differentiation through the PTH/PTHrP receptor (PPR). However, the roles of PTHrP and Ihh in regulating earlier steps in chondrocyte differentiation are unclear. We present novel mouse models with PPR abnormalities that help clarify these roles. In mice with chondrocyte-specific PPR ablation and mice with reduced PPR expression, chondrocyte differentiation was accelerated not only at the terminal step but also at an earlier step: periarticular to columnar differentiation. In these models, upregulation of Ihh action in the periarticular region was also observed. In the third model in which the PPR was disrupted in about 30% of columnar chondrocytes, Ihh action in the periarticular chondrocytes was upregulated because of ectopically differentiated hypertrophic chondrocytes that had lost PPR. Acceleration of periarticular to columnar differentiation was also noted in this mouse, while most of periarticular chondrocytes retained PPR signaling. These data suggest that Ihh positively controls differentiation of periarticular chondrocytes independently of PTHrP. Thus, chondrocyte differentiation is controlled at multiple steps by PTHrP and Ihh through the mutual regulation of their activities. PMID:12050144

Kobayashi, Tatsuya; Chung, Ung-Il; Schipani, Ernestina; Starbuck, Michael; Karsenty, Gerard; Katagiri, Takenobu; Goad, Dale L; Lanske, Beate; Kronenberg, Henry M

2002-06-01

53

Characterization of Myelomonocytoid Progenitor Cells with Mesenchymal Differentiation Potential Obtained by Outgrowth from Pancreas Explants  

PubMed Central

Progenitor cells can be obtained by outgrowth from tissue explants during primary ex vivo tissue culture. We have isolated and characterized cells outgrown from neonatal mouse pancreatic explants. A relatively uniform population of cells showing a distinctive morphology emerged over time in culture. This population expressed monocyte/macrophage and hematopoietic markers (CD11b+ and CD45+), and some stromal-related markers (CD44+ and CD29+), but not mesenchymal stem cell (MSC)-defining markers (CD90? and CD105?) nor endothelial (CD31?) or stem cell-associated markers (CD133? and stem cell antigen-1; Sca-1?). Cells could be maintained in culture as a plastic-adherent monolayer in culture medium (MesenCult MSC) for more than 1 year. Cells spontaneously formed sphere clusters “pancreatospheres” which, however, were nonclonal. When cultured in appropriate media, cells differentiated into multiple mesenchymal lineages (fat, cartilage, and bone). Positive dithizone staining suggested that a subset of cells differentiated into insulin-producing cells. However, further studies are needed to characterize the endocrine potential of these cells. These findings indicate that a myelomonocytoid population from pancreatic explant outgrowths has mesenchymal differentiation potential. These results are in line with recent data onmonocyte-derivedmesenchymal progenitors (MOMPs).

Roehrich, Marc-Estienne; Vassalli, Giuseppe

2012-01-01

54

A method for the multiple scattering correction in double-differential neutron scattering measurements  

NASA Astrophysics Data System (ADS)

This paper presents computations of multiple scattering of neutrons from plane slab samples. The analytical procedure derives the differential scattering cross section corrected for the multiple scattering directly from the experimental data. Specific applications of this method to a set of experimental results of the scattering of low energy neutrons by liquid methane and heavy water are given to illustrate the reliability of the procedure.

Demichelis, F.; Raia, G.; Tartaglia, A.

1975-03-01

55

A Brief Note on Differential Reinforcement of Other Behavior (DRO) and the Multiple Problem Behaviors in a Group Setting.  

ERIC Educational Resources Information Center

The paper presents data suggesting that differential reinforcement procedures can be used to control multiple maladaptive behaviors of severely multihandicapped persons in group situations. Modifications of traditional differential reinforcement scheduling and interval calulations, are introduced. (Author/CL)

Barton, Lyle E.; And Others

1984-01-01

56

Detecting differentially expressed genes in multiple tag sampling experiments: comparative evaluation of statistical tests  

Microsoft Academic Search

The comparison of several statistical methods currently used for detection of differentially expressed genes was attempted both by a simulation approach and by the analysis of data sets of human expressed sequence tags, obtained from UniGene. In the simulated mixed case, mimicking a situation close to reality, the general ?2 test was unexpectedly the most efficient in multiple tag sampling

C. Romualdi; S. Bortoluzzi; G. A. Danieli

2001-01-01

57

The ubiquitous fibroblast. Multiple oncogenic potentials with illustrative cases.  

PubMed Central

The wide range of oncogenic proliferative potentials of the fibroblast is demonstrated with a series of eight patients. Diagnoses included infantile digital fibromatosis, "aggressive fibromatosis," aggressive fibromatosis progressing to poorly differentiated sarcoma, infantile myofibromatosis, recurrent desmoid tumor, fibrosarcoma arising in a keloid, dermatofibrosarcoma protuberans, and malignant fibrous histiocytoma of left atrium. Still other types of fibroblastic tumefactions might have been included. Oncogenic factors that may have been operative in the causation of the lesions presented include: genetic factors, sex-linked factors, hormonal factors, numerous growth factors, and certain viruses, especially retroviruses. Certain fibromatoses in children are commonly self-limited and need only be monitored carefully as the process regresses. Aggressive fibromatosis, on the other hand, can prove fatal if the lesion is not completely resected with a wide margin and, occasionally, the process may become frankly malignant, with metastases. The standard triad of excisional surgery, radiotherapy, and chemotherapy has been used to treat frankly malignant fibrous tumors with variable results. Images Fig. 5. Fig. 6. Fig. 4. Fig. 9. Fig. 11. Fig. 12. Fig. 14.

Hardy, J D

1987-01-01

58

Local field potentials reflect multiple spatial scales in V4  

PubMed Central

Local field potentials (LFP) reflect the properties of neuronal circuits or columns recorded in a volume around a microelectrode (Buzsáki et al., 2012). The extent of this integration volume has been a subject of some debate, with estimates ranging from a few hundred microns (Katzner et al., 2009; Xing et al., 2009) to several millimeters (Kreiman et al., 2006). We estimated receptive fields (RFs) of multi-unit activity (MUA) and LFPs at an intermediate level of visual processing, in area V4 of two macaques. The spatial structure of LFP receptive fields varied greatly as a function of time lag following stimulus onset, with the retinotopy of LFPs matching that of MUAs at a restricted set of time lags. A model-based analysis of the LFPs allowed us to recover two distinct stimulus-triggered components: an MUA-like retinotopic component that originated in a small volume around the microelectrodes (~350 ?m), and a second component that was shared across the entire V4 region; this second component had tuning properties unrelated to those of the MUAs. Our results suggest that the LFP reflects neural activity across multiple spatial scales, which both complicates its interpretation and offers new opportunities for investigating the large-scale structure of network processing.

Mineault, Patrick J.; Zanos, Theodoros P.; Pack, Christopher C.

2013-01-01

59

Animal models of multiple sclerosis--potentials and limitations.  

PubMed

Experimental autoimmune encephalomyelitis (EAE) is still the most widely accepted animal model of multiple sclerosis (MS). Different types of EAE have been developed in order to investigate pathogenetic, clinical and therapeutic aspects of the heterogenic human disease. Generally, investigations in EAE are more suitable for the analysis of immunogenetic elements (major histocompatibility complex restriction and candidate risk genes) and for the study of histopathological features (inflammation, demyelination and degeneration) of the disease than for screening of new treatments. Recent studies in new EAE models, especially in transgenic ones, have in connection with new analytical techniques such as microarray assays provided a deeper insight into the pathogenic cellular and molecular mechanisms of EAE and potentially of MS. For example, it was possible to better delineate the role of soluble pro-inflammatory (tumor necrosis factor-?, interferon-? and interleukins 1, 12 and 23), anti-inflammatory (transforming growth factor-? and interleukins 4, 10, 27 and 35) and neurotrophic factors (ciliary neurotrophic factor and brain-derived neurotrophic factor). Also, the regulatory and effector functions of distinct immune cell subpopulations such as CD4+ Th1, Th2, Th3 and Th17 cells, CD4+FoxP3+ Treg cells, CD8+ Tc1 and Tc2, B cells and ??+ T cells have been disclosed in more detail. The new insights may help to identify novel targets for the treatment of MS. However, translation of the experimental results into the clinical practice requires prudence and great caution. PMID:20558237

Mix, Eilhard; Meyer-Rienecker, Hans; Hartung, Hans-Peter; Zettl, Uwe K

2010-11-01

60

Multiple isoforms and differential allelic expression of CHRNA5 in lung tissue and lung adenocarcinoma.  

PubMed

CHRNA5 gene expression variation may play a role in individual susceptibility to lung cancer. Analysis of CHRNA5 transcripts expressed in normal lung tissue detected the full-length transcript (isoform-1) and four splicing transcripts (isoform-2 to isoform-5), derived from the recognition of other splice sites in exon 5. Isoforms-2, -3 and -4 were found by protein modeling to form a completely folded, potentially functional extracellular domain and were observed at the protein level, whereas isoform-5 lacked a consistent part of the distorted ? sandwich and was not seen at the protein level. Only isoform-1 appeared to encode a complete, functional subunit able to fulfill the ion channel function. We previously reported that CHRNA5 expression is associated with genetic polymorphisms at this locus and that three haplotypes in its promoter region show functional regulation in vitro. Analysis of differential allelic expression (DAE) of three single nucleotide polymorphisms (rs503464, rs55853698 and rs55781567) tagging the expression haplotypes of the CHRNA5 promoter indicated statistically significant DAE at rs55853698 and rs55781567, in both normal lung and lung adenocarcinoma. Overall, our findings provide evidence for the presence of multiple CHRNA5 messenger RNA (mRNA) isoforms that may modulate the multimeric nicotine receptor and cis-regulatory variations in the CHRNA5 locus that act in vivo in the control of CHRNA5 mRNA expression, in normal lung tissue and in lung adenocarcinoma. PMID:23430818

Falvella, Felicia S; Alberio, Tiziana; Noci, Sara; Santambrogio, Luigi; Nosotti, Mario; Incarbone, Matteo; Pastorino, Ugo; Fasano, Mauro; Dragani, Tommaso A

2013-06-01

61

Basal Expression of Pluripotency-Associated Genes Can Contribute to Stemness Property and Differentiation Potential  

PubMed Central

Pluripotency and stemness is believed to be associated with high Oct-3/4, Nanog, and Sox-2 (ONS) expression. Similar to embryonic stem cells (ESCs), high ONS expression eventually became the measure of pluripotency in any cell. The threshold expression of ONS genes that underscores pluripotency, stemness, and differentiation potential is still unclear. Therefore, we raised a question as to whether pluripotency and stemness is a function of basal ONS gene expression. To prove this, we carried out a comparative study between basal ONS expressing NIH3T3 cells with pluripotent mouse bone marrow mesenchymal stem cells (mBMSC) and mouse ESC. Our studies on cellular, molecular, and immunological biomarkers between NIH3T3 and mBMSC demonstrated stemness property of undifferentiated NIH3T3 cells that was similar to mBMSC and somewhat close to ESC as well. In vivo teratoma formation with all three germ layer derivatives strengthen the fact that these cells in spite of basal ONS gene expression can differentiate into cells of multiple lineages without any genetic modification. Conclusively, our novel findings suggested that the phenomenon of pluripotency which imparts ability for multilineage cell differentiation is not necessarily a function of high ONS gene expression.

Dadheech, Nidheesh; Srivastava, Abhay; Belani, Muskaan; Gupta, Sharad; Pal, Rajarshi; Bhonde, Ramesh R.; Srivastava, Anand S.

2013-01-01

62

Electrochemistry of purine derivatives. 2: Correlation of anodic differential pulse peak potentials with Hammett substituent constants.  

PubMed

Differential pulse voltammetry was used to measure anodic peak potentials at the glassy carbon electrode (in pH 2 to 11 aqueous buffer versus Ag/AgCl) for 14 purine bases and nucleosides. The tested compounds included the antiviral drugs 9-[(1,3-dihydroxy-2-propoxy)-methyl]guanine (1) and acyclovir (2) plus six analogues of 1. At pH 7, representative peak potential values were as follows: 1, 0.97 V; 2, 1.01 V; 6-amino-6-deoxy-1 1.00 V; guanosine, 1.03 V; 2'-deoxyguanosine, 1.03 V. The observed potentials at pH 7 and related literature values correlated with Hammett pi(para) substituent constants. For 24 purines, stepwise multiple linear regression provided the relationship: P7 = (1.08 +/- 0.055) + (1.13 +/- 0.13) sigma 8 + (0.338 +/- 0.061)sigma(2 + 6) + (0.281 +/- 0.043)D (with n = 24, r2 = 0.930, CV = 11.1, and F = 88) where P7 is the pH 7 oxidation potential, the subscripts refer to purine ring substitution position, and D is an indicator variable for substitution at purine N9 by furanoside or glycoside analogue moieties. The observed relationship permits predictions of anodic peak potentials for other purines the substitution patterns of which are known. PMID:4078707

Kenley, R A; Jackson, S E; Martin, J C; Visor, G C

1985-10-01

63

Differentially Variable Component Analysis (dVCA): Identifying Multiple Evoked Components using Trial-to-Trial Variability  

NASA Technical Reports Server (NTRS)

Electric potentials and magnetic fields generated by ensembles of synchronously active neurons in response to external stimuli provide information essential to understanding the processes underlying cognitive and sensorimotor activity. Interpreting recordings of these potentials and fields is difficult as each detector records signals simultaneously generated by various regions throughout the brain. We introduce the differentially Variable Component Analysis (dVCA) algorithm, which relies on trial-to-trial variability in response amplitude and latency to identify multiple components. Using simulations we evaluate the importance of response variability to component identification, the robustness of dVCA to noise, and its ability to characterize single-trial data. Finally, we evaluate the technique using visually evoked field potentials recorded at incremental depths across the layers of cortical area VI, in an awake, behaving macaque monkey.

Knuth, Kevin H.; Shah, Ankoor S.; Truccolo, Wilson; Ding, Ming-Zhou; Bressler, Steven L.; Schroeder, Charles E.

2003-01-01

64

SyStemCell: A Database Populated with Multiple Levels of Experimental Data from Stem Cell Differentiation Research  

PubMed Central

Elucidation of the mechanisms of stem cell differentiation is of great scientific interest. Increasing evidence suggests that stem cell differentiation involves changes at multiple levels of biological regulation, which together orchestrate the complex differentiation process; many related studies have been performed to investigate the various levels of regulation. The resulting valuable data, however, remain scattered. Most of the current stem cell-relevant databases focus on a single level of regulation (mRNA expression) from limited stem cell types; thus, a unifying resource would be of great value to compile the multiple levels of research data available. Here we present a database for this purpose, SyStemCell, deposited with multi-level experimental data from stem cell research. The database currently covers seven levels of stem cell differentiation-associated regulatory mechanisms, including DNA CpG 5-hydroxymethylcytosine/methylation, histone modification, transcript products, microRNA-based regulation, protein products, phosphorylation proteins and transcription factor regulation, all of which have been curated from 285 peer-reviewed publications selected from PubMed. The database contains 43,434 genes, recorded as 942,221 gene entries, for four organisms (Homo sapiens, Mus musculus, Rattus norvegicus, and Macaca mulatta) and various stem cell sources (e.g., embryonic stem cells, neural stem cells and induced pluripotent stem cells). Data in SyStemCell can be queried by Entrez gene ID, symbol, alias, or browsed by specific stem cell type at each level of genetic regulation. An online analysis tool is integrated to assist researchers to mine potential relationships among different regulations, and the potential usage of the database is demonstrated by three case studies. SyStemCell is the first database to bridge multi-level experimental information of stem cell studies, which can become an important reference resource for stem cell researchers. The database is available at http://lifecenter.sgst.cn/SyStemCell/.

Zeng, Lingyao; Sun, Jiehuan; Li, Wei; Sun, Han; He, Ying; Li, Jing; Zhang, Guoqing; Wang, Chuan; Li, Yixue; Xie, Lu

2012-01-01

65

Adenosine: a potential mediator of immunosuppression in multiple organ failure  

Microsoft Academic Search

Multiple organ failure following a variety of insults, including, trauma, shock and pancreatitis, is the cause of 50–80% of all deaths in surgical intensive care units. In most patients, infections secondary to a general immunosuppressive state serve to trigger the development of multiple organ failure. This immunosuppressive state may be a consequence of excessive release of adenosine into the extracellular

György Haskó; Edwin A Deitch; Csaba Szabó; Zoltán H Németh; E. Sylvester Vizi

2002-01-01

66

First-trimester genetic diagnosis in multiple pregnancy: principles and potential pitfalls.  

PubMed

Both the principles of first-trimester genetic diagnosis in multiple pregnancy and the special considerations required to avoid potential diagnostic pitfalls are presented. The experience consisted of 65 cases of twins and one case of quadruplets. Dichorionic twins were recognized by sonography in 54 cases. Transabdominal aspiration was generally preferred to transcervical for obtaining chorionic tissue, although in two cases both approaches were used. Diagnostic error following erroneous sampling was reported in 3 out of 54 sets of dichorionic twins (5.5 per cent). When like-sex dichorionic twins cannot be differentiated by cytogenetic or DNA polymorphism studies, amniocentesis should be recommended to confirm the reliability of the result on chorionic tissue. PMID:1800988

Brambati, B; Tului, L; Lanzani, A; Simoni, G; Travi, M

1991-10-01

67

Differential redox potential profiles during adipogenesis and osteogenesis  

Microsoft Academic Search

Development is an orderly process that requires the timely activation and\\/or deactivation of specific regulatory elements\\u000a that control cellular proliferation, differentiation and apoptosis. While many studies have defined factors that control developmental\\u000a signaling, the role of intracellular reduction\\/oxidation (redox) status as a means to control differentiation has not been\\u000a fully studied. Redox states of intracellular couples may play a very

Barry R. Imhoff; Jason M. Hansen

2011-01-01

68

Single- and Multiple-Objective Optimization with Differential Evolution and Neural Networks  

NASA Technical Reports Server (NTRS)

Genetic and evolutionary algorithms have been applied to solve numerous problems in engineering design where they have been used primarily as optimization procedures. These methods have an advantage over conventional gradient-based search procedures became they are capable of finding global optima of multi-modal functions and searching design spaces with disjoint feasible regions. They are also robust in the presence of noisy data. Another desirable feature of these methods is that they can efficiently use distributed and parallel computing resources since multiple function evaluations (flow simulations in aerodynamics design) can be performed simultaneously and independently on ultiple processors. For these reasons genetic and evolutionary algorithms are being used more frequently in design optimization. Examples include airfoil and wing design and compressor and turbine airfoil design. They are also finding increasing use in multiple-objective and multidisciplinary optimization. This lecture will focus on an evolutionary method that is a relatively new member to the general class of evolutionary methods called differential evolution (DE). This method is easy to use and program and it requires relatively few user-specified constants. These constants are easily determined for a wide class of problems. Fine-tuning the constants will off course yield the solution to the optimization problem at hand more rapidly. DE can be efficiently implemented on parallel computers and can be used for continuous, discrete and mixed discrete/continuous optimization problems. It does not require the objective function to be continuous and is noise tolerant. DE and applications to single and multiple-objective optimization will be included in the presentation and lecture notes. A method for aerodynamic design optimization that is based on neural networks will also be included as a part of this lecture. The method offers advantages over traditional optimization methods. It is more flexible than other methods in dealing with design in the context of both steady and unsteady flows, partial and complete data sets, combined experimental and numerical data, inclusion of various constraints and rules of thumb, and other issues that characterize the aerodynamic design process. Neural networks provide a natural framework within which a succession of numerical solutions of increasing fidelity, incorporating more realistic flow physics, can be represented and utilized for optimization. Neural networks also offer an excellent framework for multiple-objective and multi-disciplinary design optimization. Simulation tools from various disciplines can be integrated within this framework and rapid trade-off studies involving one or many disciplines can be performed. The prospect of combining neural network based optimization methods and evolutionary algorithms to obtain a hybrid method with the best properties of both methods will be included in this presentation. Achieving solution diversity and accurate convergence to the exact Pareto front in multiple objective optimization usually requires a significant computational effort with evolutionary algorithms. In this lecture we will also explore the possibility of using neural networks to obtain estimates of the Pareto optimal front using non-dominated solutions generated by DE as training data. Neural network estimators have the potential advantage of reducing the number of function evaluations required to obtain solution accuracy and diversity, thus reducing cost to design.

Rai, Man Mohan

2006-01-01

69

A multiscale reduced-basis method for parametrized elliptic partial differential equations with multiple scales  

NASA Astrophysics Data System (ADS)

We present a technique for solving parametrized elliptic partial differential equations with multiple scales. The technique is based on the combination of the reduced basis method [C. Prud'homme, D. Rovas, K. Veroy, Y. Maday, A.T. Patera, G. Turinici, Reliable real-time solution of parametrized partial differential equations: reduced-basis output bound methods, Journal of Fluids Engineering 124 (1) (2002) 70-80] and the multiscale finite element method [T.Y. Hou, X.H. Wu, A multiscale finite element method for elliptic problems in composite materials and porous media, Journal of Computational Physics 134 (1) (1997) 169-189] to treat problems in which the differential coefficient is characterized by a large number of independent parameters. For the multiscale finite element method, a large number of cell problems has to be solved at the fine local mesh for each new configuration of the differential coefficient. In order to improve the computational efficiency of this method, we construct reduced basis spaces that are adapted to the local parameter dependence of the differential operator. The approximate solutions of the cell problems are computed accurately and efficiently via performing Galekin projection onto the reduced basis spaces and implementing the offline-online computational procedure. Therefore, a large number of similar computations at the fine local mesh can be carried out with lower computational cost for each new configuration of the differential coefficient. Numerical results are provided to demonstrate the accuracy and efficiency of the proposed approach.

Nguyen, N. C.

2008-12-01

70

Multiple spacecraft rendezvous maneuvers by differential drag and low thrust engines  

Microsoft Academic Search

A novel two-phase hybrid controller is proposed to optimize propellant consumption during multiple spacecraft rendezvous maneuvers\\u000a in Low Earth Orbit. This controller exploits generated differentials in aerodynamic drag on each involved chaser spacecraft\\u000a to effect a propellant-free trajectory near to the target spacecraft during the first phase of the maneuver, and then uses\\u000a a fuel optimal control strategy via continuous

Riccardo Bevilacqua; Jason S. Hall; Marcello Romano

2010-01-01

71

The osteogenic differentiation potentials of umbilical cord blood hematopoietic stem cells  

Microsoft Academic Search

Under specific culture conditions, umbilical cord blood derived mesenchymal stem cells (MSCs) can differentiate into osteogenic,\\u000a adipogenic, and chondrogenic lineages. The purpose of the current study was to assess the differentiation potential of osteogenic\\u000a umbilical cord blood derived hematopoietic stem cells (HSCs) and to develop an appropriate osteogenic differentiation medium\\u000a for in vitro differentiation of umbilical cord blood derived HSCs.

Mervat M. Khorshied; Heba M. Gouda; Iman A. Shaheen; Tarek N. Al Bolkeny

72

Induction of Multiple Immune Regulatory Pathways with Differential Impact in HCV/HIV Coinfection  

PubMed Central

Persistent viral infections including HCV, HBV, and HIV are associated with increased immune regulatory pathways including the extrinsic FoxP3+CD4+ regulatory T cells (Tregs) and intrinsic inhibitory pathways such as programed death-1 (PD-1) and cytotoxic T lymphocyte antigen-4 (CTLA-4) with potentially reversible suppression of antiviral effector T cells (1–12). Immunological consequences of viral coinfections relative to these immune regulatory pathways and their interplay are not well-defined. In this study, we examined the frequency, phenotype, and effector function of circulating T cell subsets in patients with chronic HCV and/or HIV infection, hypothesizing that HCV/HIV coinfection will result in greater immune dysregulation with pathogenetic consequences (13, 14). We show that multiple T cell inhibitory pathways are induced in HCV/HIV coinfection including FoxP3+ Tregs, PD-1, and CTLA-4 in inverse association with overall CD4 T cell frequency but not with liver function or HCV RNA titers. The inverse association between CD4 T cell frequency and their FoxP3, PD-1, or CTLA-4 expression remained significant in all subjects combined regardless of HCV and/or HIV infection, suggesting a global homeostatic mechanism to maintain immune regulation relative to CD4 T cell frequency. PD-1 blockade rescued T cell responses to HIV but not HCV without significant impact by CTLA-4 blockade in vitro. Collectively, these findings highlight complex immune interactions in viral coinfections and differential regulatory pathways influencing virus-specific T cells that are relevant in immunotherapeutic development.

Cho, Hyosun; Kikuchi, Masahiro; Li, Yun; Nakamoto, Nobuhiro; Amorosa, Valerianna K.; Valiga, Mary E.; Chang, Kyong-Mi

2014-01-01

73

Coordinate regulation of mRNAs from multiple calmodulin genes during myoblast differentiation in vitro.  

PubMed

Multiple genes encoding identical calmodulin molecules have been found in all mammalian species so far examined, but little is known regarding the factors involved in regulating the expression of this gene family. We have investigated the possibility of differential regulation under conditions of cell cycle withdrawal and differentiation in the nonfusing BC3H1 myoblast. Transcripts from the three genes are expressed in myoblasts and myocytes and each of the mRNA species decreases during BC3H1 differentiation. Calmodulin protein levels also decrease, although with distinct kinetics with respect to the mRNAs. Previous studies indicated that a decrease in transcription is involved (Epstein et al., Molecular Endocrinology 3:193-202, 1989). In this study, an increase in stability for each of the mRNA species is also shown to contribute to overall mRNA levels. The calmodulin mRNAs are also found to decrease under conditions of cell cycle withdrawal when differentiation is blocked. This demonstrates that the expression of mRNA from all three genes is directly coupled with the proliferation state but only indirectly with the differentiation state. Consistent with this, calmodulin expression decreases in serum deprived fibroblasts as they exit the cell cycle. PMID:8425915

Christenson, M A; Means, A R

1993-02-01

74

Inorganic phosphate regulates multiple genes during osteoblast differentiation, including Nrf2  

Microsoft Academic Search

The process of osteoblast differentiation and matrix mineralization requires a rise in alkaline phosphatase enzymatic activity resulting in the generation of free phosphate. The ability of inorganic phosphate to regulate gene transcription and cellular function represents a potentially novel extracellular signaling mechanism. Using microarray analysis we have identified a discrete set of genes that are either positively or negatively regulated

George R Beck; Elizabeth Moran; Nicole Knecht

2003-01-01

75

Multiple Sources for Cardiac Stem Cells and Their Cardiogenic Potential  

Microsoft Academic Search

\\u000a The belief that the heart is a terminally differentiated organ was a very well established notion among the scientific community\\u000a until the early 2000s, although several authors tried to challenge this dogma over the years. Nonetheless, myocyte turnover\\u000a was only accepted after the demonstration of the intense proliferation that occurs, in human hearts, acutely after myocardial\\u000a infarction. The first clues

Antonio Paolo Beltrami; Daniela Cesselli; Carlo Alberto Beltrami

76

MicroRNA-146b Promotes Myogenic Differentiation and Modulates Multiple Gene Targets in Muscle Cells  

PubMed Central

MicroRNAs are established as crucial modulators of skeletal myogenesis, but our knowledge about their identity and targets remains limited. In this study, we have identified microRNA-146b (miR-146b) as a novel regulator of skeletal myoblast differentiation. Following up on a previous microRNA profiling study, we establish that the expression of miR-146b is up-regulated during myoblast differentiation in vitro and muscle regeneration in vivo. Inhibition of miR-146b led to reduced myoblast differentiation, whereas overexpression of miR-146b enhanced differentiation. Computational prediction combined with gene expression information has revealed candidates for miR-146b targets in muscles. Among them, the expression of Smad4, Notch1, and Hmga2 are significantly suppressed by miR-146b overexpression in myocytes. In addition, expression levels of Smad4, Notch1 and Hmga2 are decreased during myoblast differentiation and muscle regeneration, inversely correlating to the levels of miR-146b. Importantly, inhibition of endogenous miR-146b prevents the down-regulation of Smad4, Notch1 and Hmga2 during differentiation. Furthermore, miR-146b directly targets the microRNA response elements (MREs) in the 3?UTR of those genes as assessed by reporter assays. Reporters with the seed regions of MREs mutated are insensitive to miR-146b, further confirming the specificity of targeting. In conclusion, miR-146b is a positive regulator of myogenic differentiation, possibly acting through multiple targets.

Khanna, Nidhi; Ge, Yejing; Chen, Jie

2014-01-01

77

Potential liability of reproductive endocrinologists for high order multiple gestation  

PubMed Central

Background In light of the recent octuplet birth and the accompanying intensive media coverage, there has been much attention on high order multiple births resulting from assisted reproductive technology. Objectives The purpose of this commentary is to review 1) the relative contribution of ART to high order multiple gestation and its impact on infant morbidity, mortality, and health care dollar loss; 2) American Society of Reproductive Medicine’s guidelines for the number of embryos transferred in ART; and 3) how reproductive endocrinologists can lessen their exposure to litigation by following the ASRM guidelines for the number of embryos transferred and documenting proper informed consent in the medical records. Recommendations In situations in which the number of embryos transferred is in excess of the ASRM guidelines, justification for deviating from the ASRM guidelines should be justifiable and documented in the medical records.

Phelps, John

2010-01-01

78

Potential role of daratumumab in the treatment of multiple myeloma  

PubMed Central

Multiple myeloma is the second most common hematologic malignancy in the US. Treatments utilizing alkylating agents, corticosteroids, proteasome inhibitors, and immunomodulatory drugs have resulted in significant survival benefits, however, despite the advances, relapse is inevitable. Decreased depth and duration of response obtained with each successive relapse of disease is typical of the disease course, thereby highlighting a continuing need for new treatment options. With the introduction of monoclonal antibodies for multiple myeloma, new options for treatment in the relapsed setting are on the horizon. Among the new immunologic agents is daratumumab (DARA), a humanized antibody to CD38 with potent multifaceted antitumor activity. Phase I and II clinical trials have demonstrated significant reduction in serum M-protein and bone marrow plasma cell percentage in refractory patients, with an acceptable toxicity profile. Moreover, ex vivo studies have shown that DARA may be particularly useful in combination with currently used anti-myeloma agents. With a recent breakthrough drug designation by the US Food and Drug Administration, DARA shows promise as mono- and combination therapy for the treatment of relapsed/refractory multiple myeloma.

Khagi, Yulian; Mark, Tomer M

2014-01-01

79

Differential Diagnosis Tool for Parkinsonian Syndrome Using Multiple Structural Brain Measures  

PubMed Central

Clinical differentiation of parkinsonian syndromes such as the Parkinson variant of multiple system atrophy (MSA-P) and cerebellar subtype (MSA-C) from Parkinson's disease is difficult in the early stage of the disease. To identify the correlative pattern of brain changes for differentiating parkinsonian syndromes, we applied discriminant analysis techniques by magnetic resonance imaging (MRI). T1-weighted volume data and diffusion tensor images were obtained by MRI in eighteen patients with MSA-C, 12 patients with MSA-P, 21 patients with Parkinson's disease, and 21 healthy controls. They were evaluated using voxel-based morphometry and tract-based spatial statistics, respectively. Discriminant functions derived by step wise methods resulted in correct classification rates of 0.89. When differentiating these diseases with the use of three independent variables together, the correct classification rate was the same as that obtained with step wise methods. These findings support the view that each parkinsonian syndrome has structural deviations in multiple brain areas and that a combination of structural brain measures can help to distinguish parkinsonian syndromes.

Ota, Miho; Nakata, Yasuhiro; Ito, Kimiteru; Kamiya, Kouhei; Ogawa, Masafumi; Murata, Miho; Obu, Satoko; Kunugi, Hiroshi; Sato, Noriko

2013-01-01

80

Improved detection of differentially expressed genes in microarray experiments through multiple scanning and image integration  

PubMed Central

The variability of results in microarray technology is in part due to the fact that independent scans of a single hybridised microarray give spot images that are not quite the same. To solve this problem and turn it to our advantage, we introduced the approach of multiple scanning and of image integration of microarrays. To this end, we have developed specific software that creates a virtual image that statistically summarises a series of consecutive scans of a microarray. We provide evidence that the use of multiple imaging (i) enhances the detection of differentially expressed genes; (ii) increases the image homogeneity; and (iii) reveals false-positive results such as differentially expressed genes that are detected by a single scan but not confirmed by successive scanning replicates. The increase in the final number of differentially expressed genes detected in a microarray experiment with this approach is remarkable; 50% more for microarrays hybridised with targets labelled by reverse transcriptase, and 200% more for microarrays developed with the tyramide signal amplification (TSA) technique. The results have been confirmed by semi-quantitative RT–PCR tests.

Romualdi, Chiara; Trevisan, Silvia; Celegato, Barbara; Costa, Germano; Lanfranchi, Gerolamo

2003-01-01

81

Adipose-derived stem cells: isolation, characterization, and differentiation potential.  

PubMed

In mammals, the two main types of adipose tissues, white and brown adipose tissues, exert different physiological functions. White adipose tissue (WAT) is for storing energy, while brown adipose tissue (BAT) is for energy consumption. Adipose-derived stem cells (ADSCs) are abundant in WAT and BAT, have multipotent characteristics, and are easily extracted. ADSCs can be differentiated into several cell lineages, including adipocytes, osteoblasts, chondrocytes (cartilage cells), myocytes, and neuronal cells. Therefore, ADSC could be considered as a strategy for future regenerative medicine and tissue engineering. PMID:23068312

Huang, Shyh-Jer; Fu, Ru-Huei; Shyu, Woei-Cherng; Liu, Shih-Ping; Jong, Gwo-Ping; Chiu, Yung-Wei; Wu, Hsiao-Su; Tsou, Yung-An; Cheng, Chao-Wen; Lin, Shinn-Zong

2013-01-01

82

Multiple Active Contours Guided by Differential Evolution for Medical Image Segmentation  

PubMed Central

This paper presents a new image segmentation method based on multiple active contours guided by differential evolution, called MACDE. The segmentation method uses differential evolution over a polar coordinate system to increase the exploration and exploitation capabilities regarding the classical active contour model. To evaluate the performance of the proposed method, a set of synthetic images with complex objects, Gaussian noise, and deep concavities is introduced. Subsequently, MACDE is applied on datasets of sequential computed tomography and magnetic resonance images which contain the human heart and the human left ventricle, respectively. Finally, to obtain a quantitative and qualitative evaluation of the medical image segmentations compared to regions outlined by experts, a set of distance and similarity metrics has been adopted. According to the experimental results, MACDE outperforms the classical active contour model and the interactive Tseng method in terms of efficiency and robustness for obtaining the optimal control points and attains a high accuracy segmentation.

Cruz-Aceves, I.; Avina-Cervantes, J. G.; Lopez-Hernandez, J. M.; Rostro-Gonzalez, H.; Garcia-Capulin, C. H.; Torres-Cisneros, M.; Guzman-Cabrera, R.

2013-01-01

83

Plant regeneration through multiple adventitious shoot differentiation from callus cultures of slash pine (Pinus elliottii).  

PubMed

A plant regeneration system through multiple adventitious shoot differentiation from callus cultures has been established in slash pine (Pinus elliottii). Influences of seven different basal media on callus induction, adventitious shoot formation, and rooting were investigated. Among the different basal media, B5, SH, and TE proved to be suitable for callus induction and plantlet regeneration. Multiple adventitious shoot formation was obtained from callus cultures of slash pine on B5, SH, and TE media containing indole-3-butyric acid, N6-benzyladenine, and thidiazuron. Scanning electron microscopy demonstrated the early development of adventitious shoots derived from callus cultures. These results indicate that an efficient plant regeneration protocol for micropropagation of slash pine had been established. This protocol could be most useful for future studies on genetic transformation of slash pine. PMID:16360808

Tang, Wei; Newton, Ronald J; Charles, Thomas M

2006-01-01

84

Optimal decoding in fading channels - A combined envelope, multiple differential and coherent detection approach  

NASA Astrophysics Data System (ADS)

A maximum likelihood sequential decoder for the reception of digitally modulated signals with single or multiamplitude constellations transmitted over a multiplicative, nonselective fading channel is derived. It is shown that its structure consists of a combination of envelope, multiple differential, and coherent detectors. The outputs of each of these detectors are jointly processed by means of an algorithm. This algorithm is presented in a recursive form. The derivation of the new receiver is general enough to accommodate uncoded as well as coded (e.g., trellis-coded) schemes. Performance evaluation results for a reduced-complexity trellis-coded QPSK system have demonstrated that the proposed receiver dramatically reduces the error floors caused by fading. At Eb/N0 = 20 dB the new receiver structure results in bit-error-rate reductions of more than three orders of magnitude compared to a conventional Viterbi receiver, while being reasonably simple to implement.

Makrakis, Dimitrios; Mathiopoulos, P. Takis

85

The New Principle Of Sensor Differentiation By Electric Potential Bias In Metal Oxide Sensor Arrays  

Microsoft Academic Search

We present a new method to differentiate the response of individual sensors in a metal oxide gas sensor array of E-nose type by application of varied electric potential biases and discuss how to employ the spatially distributed potential as a gas recognition pattern. The method is based on the impact, which the electric potential has upon the thermodynamic state of

I. Kiselev; M. Sommer; V. V. Sysoev

2009-01-01

86

Space-based surface change detection with differential Synthetic Aperture Radar (SAR) Interferometry: potentialities and preliminary  

Microsoft Academic Search

The capability of measuring small crustal deformation by means of differential Synthetic Aperture Radar (SAR) interferometry (DIFSAR) is investigated in this work. After outlining the mathematical background inherent to the principles of differential SAR interferometry and showing the potential and limits of the information content of spaceborne DIFSAR data, the analysis of the impact of this technique is carried out

Antonio Vettore; Salvatore Ponte; Nicola Crocetto

87

Smoldering multiple myeloma: present position and potential promises.  

PubMed

Since smoldering multiple myeloma (SMM) was first described over three decades ago based on a case series of six patients, its definition and our understanding of the entity have evolved considerably. The risk of progression to symptomatic myeloma (MM) varies greatly among individuals diagnosed with myeloma precursor disease. Epidemiologic, molecular, flow cytometric and radiological techniques have demonstrated that this transformation to MM from precursor states is not sudden but rather a continuous overlapping series of events with evidence of end-organ damage that could manifest in the earliest stages of disease. Contemporary antimyeloma therapies can yield rapid, deep, and durable responses with manageable toxicities, and molecular-cell-based measures are now available to rule out minimal residual disease. With this information, clinical studies with correlative measures can now be developed to test the fundamental hypothesis that intervention in early myeloma may provide a measurable clinical benefit to patients by either delaying progression or eradicating plasma cell clones. PMID:24112232

Tageja, Nishant; Manasanch, Elisabet E; Korde, Neha; Kwok, Mary; Mailankody, Sham; Bhutani, Manisha; Roschewski, Mark; Landgren, Ola

2014-01-01

88

Clonal multipotency and effect of long-term in vitro expansion on differentiation potential of human hair follicle derived mesenchymal stem cells  

PubMed Central

Hair follicle harbors a rich stem cell pool with mesenchymal lineage differentiation potential. Although previous studies with rodent cells demonstrated that hair follicle sheath and papilla cells possess multi-lineage differentiation potential, human hair follicle derived mesenchymal stem cells (hHF-MSCs) have not been characterized in detail in terms of their multipotency. In addition, it is not clear whether these cells are true stem cells that can differentiate along multiple lineages or whether they represent a collection of progenitor cells with restricted differentiation potential. Here we report that hHF-MSCs are highly proliferative cells that can be maintained in culture for ~45 population doublings before they start to show signs of cellular senescence. Under appropriate culture conditions, hHF-MSCs differentiated along the myogenic, osteogenic, adipogenic and chondrogenic lineages, as demonstrated by kinetic gene expression profiling and functional assays. Interestingly, the differentiation potential decreased with time in culture in a lineage-specific manner. Specifically, myogenesis and chondrogenesis showed a moderate decrease over time; osteogenesis was maximum at intermediate passages and adipogenesis was highly sensitive to long-term culture and was diminished at late passages. Finally, hHF-MSCs were clonally multipotent as the majority of hHF-MSCs clones (73%) demonstrated bi- or tri-lineage differentiation potential. These results suggest that hHF-MSCs may present an alternative source of easily accessible, autologous stem cells for tissue engineering and regenerative medicine.

Bajpai, Vivek K.; Mistriotis, Panagiotis; Andreadis, Stelios T.

2011-01-01

89

BlyS: a potential hallmark of multiple myeloma.  

PubMed

Multiple myeloma (MM) is a plasma cell dyscrasia characterized by bone lesions and production of a paraprotein. B-lymphocyte stimulator (BLyS) and its receptor (BAFFR) were highly expressed on peripheral blood and bone marrow B cells in MM patients as compared to those with monoclonal gammopathy of unknown significance (MGUS) and healthy donors. Serum BLyS levels in MM patients were significantly higher than those in MGUS patients and healthy controls. BLyS expression was increased in bone marrow specimens from MM patients as ascertained by immunofluorescence. Furthermore, BLyS, together with IL-2 and IL-6, significantly promoted MM cell proliferation and BLyS receptor expression compared with that in the control group. Treatment with bortezomib, a therapeutic proteasome inhibitor induced apoptosis and repressed the proliferation of RPMI8226 and U266 cells through inhibition of NF-?B p65 and I?B?. These findings suggest that BLyS is involved in the immunopathogenesis of MM and may prove to be a hallmark of MM. PMID:23276925

Wang, Ping; Qian, Liu; Yuan, Xiangliang; Hu, Chaoying; Wang, Liansheng; Huang, Qiuyu; Miao, Ping; Yu, Qiwen; Ma, Yanhui; Zhang, Jiying; Chen, Xuehua; Liu, Bingya; Shen, Lisong; Zhang, Dongqing

2013-01-01

90

Evaluation of various brain structures in multiple sclerosis with multimodality evoked potentials, blink reflex and nystagmography  

Microsoft Academic Search

Pattern reversal visual evoked potentials (VEP), blink reflexes, auditory brainstem evoked potentials (ABEP), spinal and scalp recorded somatosensory evoked potentials (SSEP), and nystagmographic records were investigated in 55 patients with multiple sclerosis (MS), who were separated in different categories of probability according to the clinical history, symptoms, and signs. The combined use of different electrophysiological methods forms a sensitive battery

W. Tackmann; H. Strenge; R. Barth; A. Sojka-Raytscheff

1980-01-01

91

Serum lactate as a novel potential biomarker in multiple sclerosis.  

PubMed

Multiple sclerosis (MS) is a primary inflammatory demyelinating disease associated with a probably secondary progressive neurodegenerative component. Impaired mitochondrial functioning has been hypothesized to drive neurodegeneration and to cause increased anaerobic metabolism in MS. The aim of our multicentre study was to determine whether MS patients had values of circulating lactate different from those of controls. Patients (n=613) were recruited, assessed for disability and clinically classified (relapsing-remitting, secondary progressive, primary progressive) at the Catholic University of Rome, Italy (n=281), at the MS Centre Amsterdam, The Netherlands (n=158) and at the S. Camillo Forlanini Hospital, Rome, Italy (n=174). Serum lactate levels were quantified spectrophotometrically with the analyst being blinded to all clinical information. In patients with MS serum lactate was three times higher (3.04±1.26mmol/l) than that of healthy controls (1.09±0.25mmol/l, p<0.0001) and increased across clinical groups, with higher levels in cases with a progressive than with a relapsing-remitting disease course. In addition, there was a linear correlation between serum lactate levels and the expanded disability scale (EDSS) (R(2)=0.419; p<0.001). These data support the hypothesis that mitochondrial dysfunction is an important feature in MS and of particular relevance to the neurodegenerative phase of the disease. Measurement of serum lactate in MS might be a relative inexpensive test for longitudinal monitoring of "virtual hypoxia" in MS and also a secondary outcome for treatment trials aimed to improve mitochondrial function in patients with MS. PMID:24726946

Amorini, Angela M; Nociti, Viviana; Petzold, Axel; Gasperini, Claudio; Quartuccio, Esmeralda; Lazzarino, Giacomo; Di Pietro, Valentina; Belli, Antonio; Signoretti, Stefano; Vagnozzi, Roberto; Lazzarino, Giuseppe; Tavazzi, Barbara

2014-07-01

92

Detecting differentially methylated loci for multiple treatments based on high-throughput methylation data  

PubMed Central

Background Because of its important effects, as an epigenetic factor, on gene expression and disease development, DNA methylation has drawn much attention from researchers. Detecting differentially methylated loci is an important but challenging step in studying the regulatory roles of DNA methylation in a broad range of biological processes and diseases. Several statistical approaches have been proposed to detect significant methylated loci; however, most of them were designed specifically for case-control studies. Results Noticing that the age is associated with methylation level and the methylation data are not normally distributed, in this paper, we propose a nonparametric method to detect differentially methylated loci under multiple conditions with trend for Illumina Array Methylation data. The nonparametric method, Cuzick test is used to detect the differences among treatment groups with trend for each age group; then an overall p-value is calculated based on the method of combining those independent p-values each from one age group. Conclusions We compare the new approach with other methods using simulated and real data. Our study shows that the proposed method outperforms other methods considered in this paper in term of power: it detected more biological meaningful differentially methylated loci than others.

2014-01-01

93

Differential meta-analysis of RNA-seq data from multiple studies  

PubMed Central

Background High-throughput sequencing is now regularly used for studies of the transcriptome (RNA-seq), particularly for comparisons among experimental conditions. For the time being, a limited number of biological replicates are typically considered in such experiments, leading to low detection power for differential expression. As their cost continues to decrease, it is likely that additional follow-up studies will be conducted to re-address the same biological question. Results We demonstrate how p-value combination techniques previously used for microarray meta-analyses can be used for the differential analysis of RNA-seq data from multiple related studies. These techniques are compared to a negative binomial generalized linear model (GLM) including a fixed study effect on simulated data and real data on human melanoma cell lines. The GLM with fixed study effect performed well for low inter-study variation and small numbers of studies, but was outperformed by the meta-analysis methods for moderate to large inter-study variability and larger numbers of studies. Conclusions The p-value combination techniques illustrated here are a valuable tool to perform differential meta-analyses of RNA-seq data by appropriately accounting for biological and technical variability within studies as well as additional study-specific effects. An R package metaRNASeq is available on the CRAN (http://cran.r-project.org/web/packages/metaRNASeq).

2014-01-01

94

Neural differentiation of patient specific iPS cells as a novel approach to study the pathophysiology of multiple sclerosis.  

PubMed

The recent introduction of technologies capable of reprogramming human somatic cells into induced pluripotent stem (iPS) cells offers a unique opportunity to study many aspects of neurodegenerative diseases in vitro that could ultimately lead to novel drug development and testing. Here, we report for the first time that human dermal fibroblasts from a patient with relapsing-remitting Multiple Sclerosis (MS) were reprogrammed to pluripotency by retroviral transduction using defined factors (OCT4, SOX2, KLF4, and c-MYC). The MSiPS cell lines resembled human embryonic stem (hES) cell-like colonies in morphology and gene expression and exhibited silencing of the retroviral transgenes after four passages. MSiPS cells formed embryoid bodies that expressed markers of all three germ layers by immunostaining and Reverse Transcriptase (RT)-PCR. The injection of undifferentiated iPS cell colonies into immunodeficient mice formed teratomas, thereby demonstrating pluripotency. The MSiPS cells were successfully differentiated into mature astrocytes, oligodendrocytes and neurons with normal karyotypes. Although MSiPS-derived neurons displayed some differences in their electrophysiological characteristics as compared to the control cell line, they exhibit properties of functional neurons, with robust resting membrane potentials, large fast tetrodotoxin-sensitive action potentials and voltage-gated sodium currents. This study provides for the first time proof of concept that disease cell lines derived from skin cells obtained from an MS patient can be generated and successfully differentiated into mature neural lineages. This represents an important step in a novel approach for the study of MS pathophysiology and potential drug discovery. PMID:22265745

Song, Bi; Sun, Guizhi; Herszfeld, Daniella; Sylvain, Aude; Campanale, Naomi V; Hirst, Claire E; Caine, Sally; Parkington, Helena C; Tonta, Mary A; Coleman, Harold A; Short, Martin; Ricardo, Sharon D; Reubinoff, Benjamin; Bernard, Claude C A

2012-03-01

95

Computational fixed-point theory for differential delay equations with multiple time lags  

NASA Astrophysics Data System (ADS)

We introduce a general computational fixed-point method to prove existence of periodic solutions of differential delay equations with multiple time lags. The idea of such a method is to compute numerical approximations of periodic solutions using Newton's method applied on a finite dimensional projection, to derive a set of analytic estimates to bound the truncation error term and finally to use this explicit information to verify computationally the hypotheses of a contraction mapping theorem in a given Banach space. The fixed point so obtained gives us the desired periodic solution. We provide two applications. The first one is a proof of coexistence of three periodic solutions for a given delay equation with two time lags, and the second one provides rigorous computations of several nontrivial periodic solutions for a delay equation with three time lags.

Kiss, Gábor; Lessard, Jean-Philippe

96

Performance evaluation of land mobile satellite system under vegetative shadowing using differential multiple TCM and QPSK  

NASA Technical Reports Server (NTRS)

A comparative analysis by computer simulation of the land mobile satellite system (LMSS) is presented for the uncoded quadrature phase shift keying (QPSK), rate 2/3 8-PSK trellis coded modulation (TCM), and rate 4/6 multiplicity 2 8-PSK TCM schemes. An analytical model is used for simulating the fading channel. The simulation results show that under Rayleigh fades, the TCM designed for the fading channel is superior to uncoded QPSK and to the conventional TCM optimized for the additive white Gaussian noise (AWGN) channel. The performance of differentially detected TCM under AWGN and fading is examined based on the preliminary results. Results of the uncoded QPSK with fading channel modeled with the empirical fade data are given.

Kim, Junghwan; Haschart, D.; Kwatra, S. C.; Vanderaar, Mark J.; Stevens, G. H.

1990-01-01

97

Metastatic potential of human colon cancer cell lines: relationship to cellular differentiation and carcinoembryonic antigen production  

Microsoft Academic Search

The relationship between cellular differentiation and carcinoembryonic antigen (CEA) production by human colorectal tumor\\u000a cells and their ability to form hepatic metastases was studied. Eight human colon cancer cell lines were injected into athymic\\u000a mice using different routes of administration to characterize their metastatic potential. The four poorly differentiated,\\u000a non or low CEA producing cell lines were poorly metastatic to

Hans E. Wagner; Carol Ann Toth; Glenn D. Steele Jr; Peter Thomas

1992-01-01

98

Effects of medium supplements on proliferation, differentiation potential, and in vitro expansion of mesenchymal stem cells.  

PubMed

Mesenchymal stem cells (MSCs) possess great potential for use in regenerative medicine. However, their clinical application may be limited by the ability to expand their cell numbers in vitro while maintaining their differential potentials and stem cell properties. Thus the aim of this study was to test the effect of a range of medium supplements on MSC self-renewal and differentiation potential. Cells were cultured until confluent and subcultured continuously until reaching senescence. Medium supplementation with fibroblast growth factor (FGF)-2, platelet-derived growth factor (PDGF)-BB, ascorbic acid (AA), and epidermal growth factor (EGF) both increased proliferation rate and markedly increased number of cell doublings before reaching senescence, with a greater than 1,000-fold increase in total cell numbers for AA, FGF-2, and PDGF-BB compared with control cultures. Long-term culture was associated with loss of osteogenic/adipocytic differentiation potential, particularly with FGF-2 supplementation but also with AA, EGF, and PDGF-BB. In addition FGF-2 resulted in reduction in expression of CD146 and alkaline phosphatase, but this was partially reversible on removal of the supplement. Cells expressed surface markers including CD146, CD105, CD44, CD90, and CD71 by flow cytometry throughout, and expression of these putative stem cell markers persisted even after loss of differentiation potentials. Overall, medium supplementation with FGF-2, AA, EGF, and PDGF-BB greatly enhanced the total in vitro expansion capacity of MSC cultures, although differentiation potentials were lost prior to reaching senescence. Loss of differentiation potential was not reflected by changes in stem cell surface marker expression. PMID:23197689

Gharibi, Borzo; Hughes, Francis J

2012-11-01

99

Proresolution Lipid Mediators in Multiple Sclerosis -- Differential, Disease Severity-Dependent Synthesis -- A Clinical Pilot Trial  

PubMed Central

Background The severity and longevity of inflammation is controlled by endogenous counter-regulatory signals. Among them are long-chain polyunsaturated fatty acid (PUFA)-derived lipid mediators, which promote the resolution of inflammation, an active process for returning to tissue homeostasis. Objective To determine whether endogenous production of lipid-derived resolution agonists is regulated differentially in patients with highly active and less active multiple sclerosis (MS). Design Matched-pairs study in University hospital Neurology department. Patients Based on clinical (relapse frequency) and paraclinical (MRI lesions, contrast enhancement) criteria, 10 pairs of age- and sex-matched patients with relapsing-remitting MS were assigned either to a group with highly active or less active MS. Lipid mediators were quantified in serum and cerebrospinal fluid using LC-MS/MS-based lipidomics. Results Levels of the key arachidonic (?-6) and docosahexaenoic acid (?-6)-derived mediators prostaglandins (PG), leukotrienes, hydroxyeicosatetraenoic acids (HETE) and resolution agonists lipoxin A4 (LXA4), resolvin D1 (RvD1) and neuroprotectin D1 (NPD1) were quantified. In the patient group with highly active MS, 15-HETE and PGE2 were increased, which are products of the 15-lipoxygenase and cyclooxygenase pathways. The proresolution mediator RvD1 was significantly upregulated and NPD1 was detected in the highly active group only. LXA4 levels were not increased in patients with highly active MS. Conclusions Lipid mediator pathways are regulated differentially in the cerebrospinal fluid of MS patients, depending on disease severity. Non-exhaustive or possibly ‘delayed’ resolution pathways may suggest a defective resolution program in patients with highly active MS. Longitudinal analyses are required to hetero-typify this differential resolution capacity, which may be associated with disease progression, longevity and eventual termination.

Brommer, Benedikt; Wengert, Oliver; Gronert, Karsten; Schwab, Jan M.

2013-01-01

100

HERV-W polymorphism in chromosome X is associated with multiple sclerosis risk and with differential expression of MSRV  

PubMed Central

Background Multiple Sclerosis (MS) is an autoimmune demyelinating disease that occurs more frequently in women than in men. Multiple Sclerosis Associated Retrovirus (MSRV) is a member of HERV-W, a multicopy human endogenous retroviral family repeatedly implicated in MS pathogenesis. MSRV envelope protein is elevated in the serum of MS patients and induces inflammation and demyelination but, in spite of this pathogenic potential, its exact genomic origin and mechanism of generation are unknown. A possible link between the HERV-W copy on chromosome Xq22.3, that contains an almost complete open reading frame, and the gender differential prevalence in MS has been suggested. Results MSRV transcription levels were higher in MS patients than in controls (U-Mann–Whitney; p?=?0.004). Also, they were associated with the clinical forms (Spearman; p?=?0.0003) and with the Multiple Sclerosis Severity Score (MSSS) (Spearman; p?=?0.016). By mapping a 3 kb region in Xq22.3, including the HERV-W locus, we identified three polymorphisms: rs6622139 (T/C), rs6622140 (G/A) and rs1290413 (G/A). After genotyping 3127 individuals (1669 patients and 1458 controls) from two different Spanish cohorts, we found that in women rs6622139 T/C was associated with MS susceptibility: [?2; p?=?0.004; OR (95% CI)?=?0.50 (0.31-0.81)] and severity, since CC women presented lower MSSS scores than CT (U-Mann–Whitney; p?=?0.039) or TT patients (U-Mann–Whitney; p?=?0.031). Concordantly with the susceptibility conferred in women, rs6622139*T was associated with higher MSRV expression (U-Mann–Whitney; p?=?0.003). Conclusions Our present work supports the hypothesis of a direct involvement of HERV-W/MSRV in MS pathogenesis, identifying a genetic marker on chromosome X that could be one of the causes underlying the gender differences in MS.

2014-01-01

101

Sirtuin 1 (SIRT1): a potential immunohistochemical marker and therapeutic target in soft tissue neoplasms with myoid differentiation.  

PubMed

Sirtuin, silent mating-type information regulation 2 homolog Saccharomyces cerevisiae 1 (SIRT1), is a protein that has been implicated in multiple mammalian functions including cell aging, stress resistance, and differentiation. SIRT1 has also been shown to be involved in multiple tumors. In addition, new pharmacotherapies have recently been approved that target SIRT1. The purpose of this study was to use immunohistochemistry to characterize SIRT1 protein expression in human soft tissue neoplasms with the hopes of finding new diagnostic and therapeutic modalities. SIRT1 immunoreactivity was reviewed in a series of 164 soft tissue tumors including alveolar soft part sarcoma, angiomyolipoma, clear cell sarcoma, desmoid/fibromatosis, desmoplastic small round cell tumor, Ewing sarcoma, gastrointestinal stromal tumor, glomus tumor, leiomyoma, leiomyosarcoma, lipoma, liposarcoma, malignant peripheral nerve sheath tumor, nodular fasciitis, osteosarcoma, rhabdomyosarcoma, schwannoma, solitary fibrous tumor, synovial sarcoma, undifferentiated pleomorphic sarcoma, and Wilms tumor. In addition, numerous benign tissues were tested for SIRT1 reactivity. In nonneoplastic tissue, strong cytoplasmic SIRT1 reactivity was observed in all prostate stroma, smooth muscle, and striated muscle. A similar pattern of cytoplasmic SIRT1 expression was observed in soft tissue neoplasms with myoid differentiation, namely, angiomyolipoma (100%), glomus tumor (100%), leiomyoma (90%), leiomyosarcoma (76.5%), and rhabdomyosarcoma (87%). The other lesions examined were negative. Although the physiologic role of SIRT1 remains to be clarified in myoid tissues and neoplasms differentiating along these lines, this observation points to a potential role for this marker in diagnostic immunohistochemistry. Furthermore, the recent emergence of drugs capable of selectively inhibiting SIRT1 raises the possibility of a potential application for targeted therapy. Additional studies are necessary to further characterise the role of SIRT1 in myoid tissues and neoplasms. PMID:23332867

Dickson, Brendan C; Riddle, Nicole D; Brooks, John S; Pasha, Theresa L; Zhang, Paul J

2013-06-01

102

Human Endogenous Retroviruses in Multiple Sclerosis: Potential for Novel Neuro-Pharmacological Research  

PubMed Central

There is growing evidence that the env genes of two or more human endogenous retroviruses (HERVs) of the W family are contributing to the inflammatory processes, and thus to the pathogenesis, of multiple sclerosis (MS). Increasing understanding of the human endogenous retroviral locus, ERVWE1, and the putative multiple sclerosis associated retrovirus, or MSRV, and in particular of the HERV-W env sequences associated with these, offers the potential of new lines of pharmacological research that might assist diagnosis, prognosis and therapy of multiple sclerosis.

Ryan, F.P

2011-01-01

103

Multiplication  

NSDL National Science Digital Library

How sharp are your multiplication skills? Give these great math games a try ! Play Asteroids blaster and test your multiplication skills. How fast can you solve the problem... play a round of Baseball multiplication and see! Multiplication is fun and delicious with Crazy Cones. Help Lemonade Larry determine the correct amount! Test your multiplication skills with Tic Tac Toe! ...

Ms.roberts

2009-02-24

104

Voxel based comparison of glucose metabolism in the differential diagnosis of the multiple system atrophy  

NASA Astrophysics Data System (ADS)

Multiple system atrophy (MSA) including striatonigral degeneration (SND) and olivopontocerebellar atrophy (OPCA) is a group of heterogeneous degenerative neurological disorders, which differ from the idiopathic Parkinson"s disease (IPD) in certain clinical features. The differential diagnosis between IPD and MSA is difficult because of the common of signs and symptoms common. The purpose of this study was comparison of cerebral glucose metabolic differences of SND, OPCA and IPD. The 18F-FDG PET images of SND, OPCA and IPD patients were assessed by statistical pattern analysis using statistical parametric mapping (SPM) and image registration in order to determine the useful metabolic patterns. A total of 11 patients with MSA (5 SND: mean age 61.6+/-8.3 y, M/F 1/4; 6 OPCA: mean age 55.3+/-8.4 y, M/F 3/3), 8 patients (mean age 67.9 10.7y; M/F: 3/5) with IPD were enrolled in this study. All subjects and 22 age matched normal controls underwent 18F-FDG PET. Each of the SND, OPCA and IPD patients were individually compared with the normal control group using a two-sided t-test for SPM (P<0.05). The OPCA group showed significant hypometabolism in the cerebellum and pons compared to the control group, whereas in the patients with SND showed significant hypometabolism in the putamen. SPM also revealed pons, putamen hypometabolism in OPCA and SND patients compared with IPD patients. An assessment of the 18F-FDG PET images using the image registration and statistical analysis might be a useful adjunct to a clinical examination when making a differential diagnosis of Parkinsonism.

Juh, Rahyeong; Suh, Taesuk; Chung, Yongan; Yang, Dongwon

2005-04-01

105

Multiple solutions for nonlinear Neumann problems with the p-Laplacian and a nonsmooth crossing potential  

NASA Astrophysics Data System (ADS)

We consider a nonlinear Neumann problem driven by the p-Laplace differential operator and with a nonsmooth locally Lipschitz potential (hemivariational inequality). We assume that the potential is asymptotically p-linear and crossing. Combining the nonsmooth critical point theory with suitable truncation and perturbation techniques, we show that the problem has at least two nontrivial smooth solutions, of which one is strictly positive.

Papageorgiou, N. S.; Smyrlis, G.

2010-03-01

106

[Multiple nodose shadows of the lungs as a differential diagnosis problem].  

PubMed

In summer 1996, a 31-year-old woman developed arthralgia, subfebrility, and papular efflorescences on the skin, clinically and histologically suspect of vasculitis, to be followed by severe lung edema and anuria, with serum creatinine up to 1182 mol/L in the autumn 1996. The administration of high dose corticosteroids, plasmapheresis and hemodialysis resulted in regression of the clinical symptoms and considerable improvement of the kidney function. Kidney biopsy revealed sclerosing extracapsular glomerulonephritis with extensive fibrocellular crescents. Thereafter, the patient felt well, however, renal insufficiency showed gradual progression, so the patient was continuously treated with hemodialysis from January 1998. Two more episodes of severe lung edema occurred at the beginning of 1998 and in the autumn 1998, with rapid symptom regression upon the administration of high dose corticosteroids. In April 1998, during the episode of staphylococcal sepsis, multiple nodose shadows of the lungs were detected, to persist asymptomatically for the next six months. Toward the end of November, nodal enlargement and disruption, with the formation of cavitations occurred. The patient's general condition deteriorated gradually, and she died from respiratory arrest in February 1999. The patient received corticosteroids during most of the disease course, and cyclophosphamide only once, during the first episode of lung edema. On autopsy, a number of cavitations were observed in the lungs, with necrotic areas of a varying size and numerous cicatrices in the rest of pulmonary parenchyma. Besides fibrosis and areas of necrosis, histology showed palisading granulomas, with erythrocytes, macrophages and siderophages within the alveoles. Apart from candidal colonization of the airways, which developed in the terminal stage of the disease, all tests for fungi, Staphylococcus aureus and Mycobacterium tuberculosis were repeatedly negative. ANCA and other immunoassays were also negative on several occasions. Differential diagnosis of multiple nodose lesions of the lungs is discussed. The authors believe the patient suffered from Wegener's granulomatosis. PMID:16933841

Belavi?, Zarko; Vitas, Borivoj; Doko, Andrija; Baskot, Ana; Polovi?, Ante; Mlinac-Lucijani?, Mira

2006-06-01

107

Liquid water ionization by fast electron impact: a multiple differential study for the 1B1 orbital  

Microsoft Academic Search

We study theoretically the single ionization of water molecules in a liquid phase by impact of fast electrons in a coplanar geometry. For the first time, the wavefunction for a single water molecule in the liquid phase is described in a realistic way by means of a Wannier orbital formalism. Multiple differential cross sections for the most external 1B1 orbital

M L de Sanctis; M-F Politis; R Vuilleumier; C R Stia; O A Fojón

2012-01-01

108

Regulation of multiple target genes by miR-1 and miR-206 is pivotal for C2C12 myoblast differentiation.  

PubMed

MicroRNAs are short non-coding RNAs involved in post-transcriptional regulation of multiple messenger RNA targets. The miR-1/miR-206 family is expressed during skeletal muscle differentiation and is an integral component of myogenesis. To better understand miR-1/miR-206 function during myoblast differentiation we identified novel target mRNAs by microarray and characterized their function in C2C12 myoblasts. Candidate targets from the screen were experimentally validated together with target genes that were predicted by three different algorithms. Some targets characterised have a known function in skeletal muscle development and/or differentiation and include Meox2, RARB, Fzd7, MAP4K3, CLCN3 and NFAT5, others are potentially novel regulators of myogenesis, such as the chromatin remodelling factors Smarcd2 and Smarcb1 or the anti-apoptotic protein SH3BGRL3. The expression profiles of confirmed target genes were examined during C2C12 cell myogenesis. We found that inhibition of endogenous miR-1 and miR-206 by antimiRs blocked the downregulation of most targets in differentiating cells, thus indicating that microRNA activity and target interaction is required for muscle differentiation. Finally, we show that sustained expression of validated miR-1 and/or miR-206 targets resulted in increased proliferation and inhibition of C2C12 cell myogenesis. In many cases the expression of genes related to non-muscle cell fates, such as chondrogenesis, was activated. This indicates that the concerted downregulation of multiple microRNA targets is not only crucial to the skeletal muscle differentiation program but also serves to prevent alternative cell fate choices. PMID:22595520

Goljanek-Whysall, Katarzyna; Pais, Helio; Rathjen, Tina; Sweetman, Dylan; Dalmay, Tamas; Münsterberg, Andrea

2012-08-01

109

Multimodal evoked potentials to assess the evolution of multiple sclerosis: a longitudinal study  

PubMed Central

Background Evoked potentials are used in the functional assessment of sensory and motor pathways. Their usefulness in monitoring the evolution of multiple sclerosis has not been fully clarified. Objective The aim of this longitudinal study was to examine the usefulness of multimodal evoked potential in predicting paraclinical outcomes of disease severity and as a prognostic marker in multiple sclerosis. Methods Eighty four patients with clinically definite multiple sclerosis underwent Expanded Disability Status Scale (EDSS) and functional system scoring at study entry and after a mean (standard deviation) follow?up of 30.5 (11.7)?months. Sensory and motor evoked potentials were obtained in all patients at study entry and at follow?up in 64 of them, and quantified according to a conventional score. Results Cross?sectionally, the severity of each evoked potential score significantly correlated with the corresponding functional system (0.32potential) and with EDSS (0.34potential). EDSS significantly correlated with global evoked potential score severity (baseline R?=?0.60, follow?up R?=?0.46, p<0.001). Using longitudinal analysis, only changes in somatosensory evoked potential scores were significantly correlated with changes of sensory functional system (R?=?0.34, p?=?0.006). However, patients with multiple sclerosis with disability progression at follow?up had more severe baseline evoked potential scores than patients who remained stable. Patients with severe baseline global evoked potential score (higher than the median value) had a risk of 72.5% to progress on disability at follow?up, whereas patients with multiple sclerosis with lower scores had a risk of only 36.3%. Conclusions These results suggest that evoked potential is a good marker of the severity of nervous damage in multiple sclerosis and may have a predictive value regarding the evolution of disability.

Leocani, L; Rovaris, M; Boneschi, F M; Medaglini, S; Rossi, P; Martinelli, V; Amadio, S; Comi, G

2006-01-01

110

Withania somnifera water extract as a potential candidate for differentiation based therapy of human neuroblastomas.  

PubMed

Neuroblastoma is an aggressive childhood disease of the sympathetic nervous system. Treatments are often ineffective and have serious side effects. Conventional therapy of neuroblastoma includes the differentiation agents. Unlike chemo-radiotherapy, differentiation therapy shows minimal side effects on normal cells, because normal non-malignant cells are already differentiated. Keeping in view the limited toxicity of Withania somnifera (Ashwagandha), the current study was aimed to investigate the efficacy of Ashwagandha water extract (ASH-WEX) for anti-proliferative potential in neuroblastoma and its underlying signalling mechanisms. ASH-WEX significantly reduced cell proliferation and induced cell differentiation as indicated by morphological changes and NF200 expression in human IMR-32 neuroblastoma cells. The induction of differentiation was accompanied by HSP70 and mortalin induction as well as pancytoplasmic translocation of the mortalin in ASH-WEX treated cells. Furthermore, the ASH-WEX treatment lead to induction of neural cell adhesion molecule (NCAM) expression and reduction in its polysialylation, thus elucidating its anti-migratory potential, which was also supported by downregulation of MMP 2 and 9 activity. ASH-WEX treatment led to cell cycle arrest at G0/G1 phase and increase in early apoptotic population. Modulation of cell cycle marker Cyclin D1, anti-apoptotic marker bcl-xl and Akt-P provide evidence that ASH-WEX may prove to be a promising phytotherapeutic intervention in neuroblatoma related malignancies. PMID:23383150

Kataria, Hardeep; Wadhwa, Renu; Kaul, Sunil C; Kaur, Gurcharan

2013-01-01

111

UCP2 regulates energy metabolism and differentiation potential of human pluripotent stem cells  

PubMed Central

It has been assumed, based largely on morphologic evidence, that human pluripotent stem cells (hPSCs) contain underdeveloped, bioenergetically inactive mitochondria. In contrast, differentiated cells harbour a branched mitochondrial network with oxidative phosphorylation as the main energy source. A role for mitochondria in hPSC bioenergetics and in cell differentiation therefore remains uncertain. Here, we show that hPSCs have functional respiratory complexes that are able to consume O2 at maximal capacity. Despite this, ATP generation in hPSCs is mainly by glycolysis and ATP is consumed by the F1F0 ATP synthase to partially maintain hPSC mitochondrial membrane potential and cell viability. Uncoupling protein 2 (UCP2) plays a regulating role in hPSC energy metabolism by preventing mitochondrial glucose oxidation and facilitating glycolysis via a substrate shunting mechanism. With early differentiation, hPSC proliferation slows, energy metabolism decreases, and UCP2 is repressed, resulting in decreased glycolysis and maintained or increased mitochondrial glucose oxidation. Ectopic UCP2 expression perturbs this metabolic transition and impairs hPSC differentiation. Overall, hPSCs contain active mitochondria and require UCP2 repression for full differentiation potential.

Zhang, Jin; Khvorostov, Ivan; Hong, Jason S; Oktay, Yavuz; Vergnes, Laurent; Nuebel, Esther; Wahjudi, Paulin N; Setoguchi, Kiyoko; Wang, Geng; Do, Anna; Jung, Hea-Jin; McCaffery, J Michael; Kurland, Irwin J; Reue, Karen; Lee, Wai-Nang P; Koehler, Carla M; Teitell, Michael A

2011-01-01

112

Withania somnifera Water Extract as a Potential Candidate for Differentiation Based Therapy of Human Neuroblastomas  

PubMed Central

Neuroblastoma is an aggressive childhood disease of the sympathetic nervous system. Treatments are often ineffective and have serious side effects. Conventional therapy of neuroblastoma includes the differentiation agents. Unlike chemo-radiotherapy, differentiation therapy shows minimal side effects on normal cells, because normal non-malignant cells are already differentiated. Keeping in view the limited toxicity of Withania somnifera (Ashwagandha), the current study was aimed to investigate the efficacy of Ashwagandha water extract (ASH-WEX) for anti-proliferative potential in neuroblastoma and its underlying signalling mechanisms. ASH-WEX significantly reduced cell proliferation and induced cell differentiation as indicated by morphological changes and NF200 expression in human IMR-32 neuroblastoma cells. The induction of differentiation was accompanied by HSP70 and mortalin induction as well as pancytoplasmic translocation of the mortalin in ASH-WEX treated cells. Furthermore, the ASH-WEX treatment lead to induction of neural cell adhesion molecule (NCAM) expression and reduction in its polysialylation, thus elucidating its anti-migratory potential, which was also supported by downregulation of MMP 2 and 9 activity. ASH-WEX treatment led to cell cycle arrest at G0/G1 phase and increase in early apoptotic population. Modulation of cell cycle marker Cyclin D1, anti-apoptotic marker bcl-xl and Akt-P provide evidence that ASH-WEX may prove to be a promising phytotherapeutic intervention in neuroblatoma related malignancies.

Kataria, Hardeep; Wadhwa, Renu; Kaul, Sunil C.; Kaur, Gurcharan

2013-01-01

113

CD133: a potential indicator for differentiation and prognosis of human cholangiocarcinoma  

PubMed Central

Background CD133 is known to be a cancer stem cell (CSC) marker. However, recent studies have revealed that CD133 is not restricted to CSC but to be expressed not only in human normal tissues but also in some cancers and could serve as a prognostic factor for the patients. Nevertheless, the expression of CD133 in human cholangiocarcinoma (CC) is rare and our study is to detect the expression and explore the potential functions of CD133 in human CC. Methods Fifty-nine cases, comprised of 5 normal liver tissues and 54 consecutive CC specimens (21 well-differentiated, 12 moderately-differentiated and 21 poorly-differentiated), were included in the study. Immunohistochemical stainning with CD133 protein was carried out, and statistical analyses were performed. Results CD133 was found to express in all 5 normal livers and 40 out of 54 (74%) CC tissues with different subcellular localization. In the well, moderately and poorly differentiated cases, the numbers of CD133 positive cases were 19 (19 of 21, 90%), 10 (10 of 12, 83%) and 11 (11 of 21, 52%) respectively. Further statistical analyses indicated that the expression and different subcellular localization of CD133 were significantly correlated with the differentiation status of tumors (P = 0.004, P = 0.009). Among 23 patients followed up for survival, the median survival was 4 months for fourteen CD133 negative patients but 14 months for nine CD133 positive ones. In univariate survival analysis, CD133 negative expression correlated with poor prognosis while CD133 positive expression predicted a favorable outcome of CC patients (P = 0.001). Conclusions Our study demonstrates that CD133 expression correlates with the differentiation of CC and indicates that CD133 is a potential indicator for differentiation and prognosis of human CC.

2011-01-01

114

Characterisation and differentiation potential of bone marrow derived canine mesenchymal stem cells.  

PubMed

Mesenchymal stem cells (MSCs) have potential for use in regenerative therapeutics, since they are capable of multi-lineage differentiation. In this study, primary canine MSCs (cMSCs) were isolated from bone marrow aspirates and characterised using marker expression and morphology. cMSCs expressed CD44 and STRO-1, but not CD34 or CD45. Morphologically, cMSCs were similar to previously described MSCs and were capable of chondrocyte differentiation towards articular type cartilage, characterised by increased collagen type II vs. collagen type I expression and expression of Sox-9. cMSCs demonstrated no significant alterations in marker profiles and failed to differentiate into cardiomyocytes in response to a cardiac differentiation protocol or when co-cultured with canine cardiac stem cells. The study indicated that cMSCs can be derived readily from bone marrow and are capable of differentiation into articular cartilage, but appear to have limited ability to differentiate into cardiomyocytes using current protocols. PMID:22721628

Hodgkiss-Geere, Hannah M; Argyle, David J; Corcoran, Brendan M; Whitelaw, Bruce; Milne, Elspeth; Bennett, David; Argyle, Sally A

2012-12-01

115

On orthogonality constrained multiple core-hole states and optimized effective potential method.  

PubMed

An attempt to construct a multiple core-hole state within the optimized effective potential (OEP) methodology is presented. In contrast to the conventional ?-self-consistent field method for hole states, the effects of removing an electron is achieved using some orthogonality constraints imposed on the orbitals so that a Slater determinant describing a hole state is constrained to be orthogonal to that of a neutral system. It is shown that single, double, and multiple core-hole states can be treated within a unified framework and can be easily implemented for atoms and molecules. For this purpose, a constrained OEP method proposed earlier for excited states (Glushkov and Levy, J. Chem. Phys. 2007, 126, 174106) is further developed to calculate single and double core ionization energies using a local effective potential expressed as a direct mapping of the external potential. The corresponding equations, determining core-hole orbitals from a one-particle Schrödinger equation with a local potential as well as correlation corrections derived from the second-order many-body perturbation theory are given. One of the advantages of the present direct mapping formulation is that the effective potential, which plays the role of the Kohn-Sham potential, has the symmetry of the external potential. Single and double core ionization potentials computed with the presented scheme were found to be in agreement with data available from experiment and other calculations. We also discuss core-hole state local potentials for the systems studied. PMID:22696265

Glushkov, V N; Assfeld, X

2012-10-01

116

Adipogenic Potential of Multiple Human Adenoviruses In Vivo and In Vitro in Animals  

NSDL National Science Digital Library

Journal Article ÃÂAdipogenic potential of multiple human adenoviruses in vivo and in vitro in animals,ÃÂ by Leah D. Whigham, Barbara A. Israel, and Richard L. Atkinson, found in the American Journal of Physiology-Regulatory, Integrative and Comparative Physiology.

Leah D. Whigham (University of Wisconsin-Madison Departments of Medicine and Nutritional Sciences); MD Richard L. Atkinson (Obetech Obesity Research Center); Barbara A. Israel (University of Wisconsin-Madison Department of Pathological Sciences)

2006-01-01

117

Hyperbaric oxygen in chronic progressive multiple sclerosis: visual evoked potentials and clinical effects  

Microsoft Academic Search

The effects of hyperbaric oxygen at a pressure of two atmospheres absolute were studied in a group of patients with chronic progressive multiple sclerosis. A slight but statistically insignificant shortening of the visual evoked potential latencies was seen after treatment with hyperbaric oxygen as compared with placebo treatment. The treatment did not appreciably halt the progression of the disease and

J Neiman; B Y Nilsson; P O Barr; D J Perrins

1985-01-01

118

Multiple Channel Detection of Steady-State Visual Evoked Potentials for Brain-Computer Interfaces  

Microsoft Academic Search

In this paper, novel methods for detecting steady-state visual evoked potentials using multiple electroencephalogram (EEG) signals are presented. The methods are tailored for brain-computer interfacing, where fast and accurate detection is of vital importance for achieving high information transfer rates. High detection accuracy using short time segments is obtained by finding combinations of electrode signals that cancel strong interference signals

Ola Friman; Ivan Volosyak; Axel Graser

2007-01-01

119

Ultrastructural assessment of the differentiation potential of human multipotent mesenchymal stromal cells.  

PubMed

Mesenchymal stromal (stem) cells (MSCs) are defined by plastic adherent growth, multiple phenotype expressions, and tripotential mesodermal capability. The authors report examples where electron microscopy (EM) plays a role in stem cell research. MSCs isolated from human arteries are ultrastructurally heterogeneous and become more homogenous after plastic adhesion. EM shows a moderate complement of organelles, mainly mitochondria, rough endoplasmic reticulum, and glycogen aggregates. Clear vacuoles and vesicles are prominent when cells are recovered from plates using an enzymatic method. Since the mesengenic plasticity is the single most important criterion to define a cell as mesenchymal stromal, the authors induced experimentally adipogenic, leiomyogenic, cardiomyogenic, osteo-chondrogenic differentiations. In no case did EM reveal the achievement of complete differentiation. The authors obtained multivacuolated pre-adipocytes and never univacuolated adipocytes typical of mature white fat; myofibroblast and rhabdomyoblast morphotypes, where contractile filaments were not organized to form functional complexes, i.e., dense bodies and sarcomeres. Chondrogenesis and osteogenesis assays resulted in extracellular matrix changes. Collagen and proteoglycan filament/particle deposition was seen when chondrogenesis was promoted. Hydroxyapatite crystals, psammoma bodies, and plaque-like calcified matrix deposits were found in the osteogenic matrix. EM provides detailed structural information on the degree of differentiation induced in stem cells and demonstrates that the methods so far developed are not able to promote complete cell differentiation. These observations contribute to explain why clinical applications with hMSCs have produced results far lower than initial expectations. PMID:24047349

Pasquinelli, Gianandrea; Valente, Sabrina

2013-10-01

120

Effect of body temperature on visual evoked potential delay and visual perception in multiple sclerosis.  

PubMed Central

Seven multiple sclerosis patients were cooled and four heated, but evoked potential delay changed in only five out 11 experiments. Control limits were set by cooling eight and heating four control subjects. One patient gave anomalous results in that although heating degraded perceptual delay and visual acuity, and depressed the sine wave grating MTF, double-flash resolution was improved. An explanation is proposed in terms of the pattern of axonal demyelination. The medium frequency flicker evoked potential test seems to be a less reliable means of monitoring the progress of demyelination in multiple sclerosis patients than is double-flash campimetry or perceptual delay campimetry, although in some situations the objectivity of the evoked potential test would be advantageous.

Regan, D; Murray, T J; Silver, R

1977-01-01

121

Determination of Kohn-Sham effective potentials from electron densities using the differential virial theorem  

NASA Astrophysics Data System (ADS)

We present an accurate method for constructing the Kohn-Sham effective potential corresponding to a given electron density in one-dimensional and spherically symmetric systems. The method is based on the differential virial theorem--an exact relation between the effective potential, the electron density, and the kinetic energy density. A distinctive feature of the proposed technique is that it employs a size-consistent bosonic reference potential to ensure the correct asymptotic behavior of the resulting Kohn-Sham potential. We describe a practical implementation of our method and use it to obtain high-quality exchange-correlation and correlation potentials of the neon and argon atoms from ab initio densities generated in large Slater- and Gaussian-type basis sets.

Ryabinkin, Ilya G.; Staroverov, Viktor N.

2012-10-01

122

Determination of Kohn-Sham effective potentials from electron densities using the differential virial theorem.  

PubMed

We present an accurate method for constructing the Kohn-Sham effective potential corresponding to a given electron density in one-dimensional and spherically symmetric systems. The method is based on the differential virial theorem--an exact relation between the effective potential, the electron density, and the kinetic energy density. A distinctive feature of the proposed technique is that it employs a size-consistent bosonic reference potential to ensure the correct asymptotic behavior of the resulting Kohn-Sham potential. We describe a practical implementation of our method and use it to obtain high-quality exchange-correlation and correlation potentials of the neon and argon atoms from ab initio densities generated in large Slater- and Gaussian-type basis sets. PMID:23126701

Ryabinkin, Ilya G; Staroverov, Viktor N

2012-10-28

123

Detection of Olfactory Dysfunction Using Olfactory Event Related Potentials in Young Patients with Multiple Sclerosis  

PubMed Central

Background Several studies reported olfactory dysfunction in patients with multiple sclerosis. The estimate of the incidence of olfactory deficits in multiple sclerosis is uncertain; this may arise from different testing methods that may be influenced by patients' response bias and clinical, demographic and cognitive features. Aims To evaluate objectively the olfactory function using Olfactory Event Related Potentials. Materials and Methods We tested the olfactory function of 30 patients with relapsing remitting multiple sclerosis (mean age of 36.03±6.96 years) and of 30 age, sex and smoking–habit matched healthy controls by using olfactory potentials. A selective and controlled stimulation of the olfactory system to elicit the olfactory event related potentials was achieved by a computer-controlled olfactometer linked directly with electroencephalograph. Relationships between olfactory potential results and patients' clinical characteristics, such as gender, disability status score, disease-modifying therapy, and disease duration, were evaluated. Results Seven of 30 patients did not show olfactory event related potentials. Sixteen of remaining 23 patients had a mean value of amplitude significantly lower than control group (p<0.01). The presence/absence of olfactory event related potentials was associated with dichotomous expanded disability status scale (p?=?0.0433), as well as inversely correlated with the disease duration (r?=??0.3641, p?=?0.0479). Conclusion Unbiased olfactory dysfunction of different severity found in multiple sclerosis patients suggests an organic impairment which could be related to neuroinflammatory and/or neurodegenerative processes of olfactory networks, supporting the recent findings on neurophysiopathology of disease.

Caminiti, Fabrizia; De Salvo, Simona; De Cola, Maria Cristina; Russo, Margherita; Bramanti, Placido; Marino, Silvia; Ciurleo, Rosella

2014-01-01

124

A cost-effective differential mobility analyzer (cDMA) for multiple DMA column applications  

SciTech Connect

In aerosol research and applications, a differential mobility analyzer (DMA) is now considered the standard tool for sizing and classifying monodisperse particles in the sub-micrometer and nanometer size ranges. However, DMA application at the pilot or industrial production scale remains infeasible because of the low mass throughput. A simple way to scale up DMA operation is to use multiple DMA columns. The manufacture and maintenance costs of existing DMAs, however, limit such a scale-up. A cost-effective DMA column (named cDMA) has thus been developed in this work to address the above issue. To reduce its manufacturing cost, the prototype was constructed using parts requiring little machining. The cDMA column was also designed for easy maintenance and easy variation of the classification length for any application-specified size range. In this study, prototypes with two particle classification lengths, 1.75 and 4.50 cm, were constructed and their performance was experimentally evaluated at sheath-to-aerosol flowrate ratios of 5:1, 10:1, and 15:1 via the tandem DMA (TDMA) technique. It was concluded that both prototype cDMAs, operated at a sheath/aerosol flowrate ratio less than 15:1 and with a polydisperse aerosol flowrate of 1.0 lpm, achieved sizing resolution comparable to that offered by Nano-DMA. The longer cDMA had comparable transmission efficiency to that of Nano-DMA, and the shorter cDMA exceeded the performance of Nano-DMA. Hence, the cDMA with the shorter (1.75 cm) classification length is better suited for the characterization of macromolecular samples.

Mei, F.; Fu, H.; Chen, D.-R.

2011-05-04

125

Differentiation of ocular fundus fluorophores by fluorescence lifetime imaging using multiple excitation and emission wavelengths  

NASA Astrophysics Data System (ADS)

Ocular fundus autofluorescence imaging has been introduced into clinical diagnostics recently. It is in use for the observation of the age pigment lipofuscin, a precursor of age - related macular degeneration (AMD). But other fluorophores may be of interest too: The redox pair FAD - FADH2 provides information on the retinal energy metabolism, advanced glycation end products (AGE) indicate protein glycation associated with pathologic processes in diabetes as well as AMD, and alterations in the fluorescence of collagen and elastin in connective tissue give us the opportunity to observe fibrosis by fluorescence imaging. This, however, needs techniques able to differentiate particular fluorophores despite limited permissible ocular exposure as well as excitation wavelength (limited by the transmission of the human ocular lens to >400 nm). We present an ophthalmic laser scanning system (SLO), equipped with picosecond laser diodes (FWHM 100 ps, 446 nm or 468 nm respectively) and time correlated single photon counting (TCSPC) in two emission bands (500 - 560 nm and 560 - 700 nm). The decays were fitted by a bi-exponential model. Fluorescence spectra were measured by a fluorescence spectrometer fluorolog. Upon excitation at 446 nm, the fluorescence of AGE, FAD, and lipofuscin were found to peak at 503 nm, 525 nm, and 600 nm respectively. Accordingly, the statistical distribution of the fluorescence decay times was found to depend on the different excitation wavelengths and emission bands used. The use of multiple excitation and emission wavelengths in conjunction with fluorescence lifetime imaging allows us to discriminate between intrinsic fluorophores of the ocular fundus. Taken together with our knowledge on the anatomical structure of the fundus, these findings suggest an association of the short, middle and long fluorescence decay time to the retinal pigment epithelium, the retina, and connective tissue respectively.

Hammer, M.; Schweitzer, D.; Schenke, S.; Becker, W.; Bergmann, A.

2006-10-01

126

Yolk Sac Mesenchymal Progenitor Cells from New World Mice (Necromys lasiurus) with Multipotent Differential Potential  

PubMed Central

Fetal membranes are abundant, ethically acceptable and readily accessible sources of stem cells. In particular, the yolk sac is a source of cell lineages that do not express MHCs and are mainly free from immunological incompatibles when transferred to a recipient. Although data are available especially for hematopoietic stem cells in mice and human, whereas other cell types and species are dramatically underrepresented. Here we studied the nature and differentiation potential of yolk sac derived mesenchymal stem cells from a New World mouse, Necromys lasiurus. Explants from mid-gestation were cultured in DMEM-High glucose medium with 10% defined fetal bovine serum. The cells were characterized by standard methods including immunophenotyping by fluorescence and flow cytometry, growth and differentiation potential and tumorigenicity assays. The first adherent cells were observed after 7 days of cell culture and included small, elongated fibroblast-like cells (92.13%) and large, round epithelial-like cells with centrally located nuclei (6.5%). Only the fibroblast-like cells survived the first passages. They were positive to markers for mesenchymal stem cells (Stro-1, CD90, CD105, CD73) and pluripotency (Oct3/4, Nanog) as well as precursors of hematopoietic stem cells (CD117). In differentiation assays, they were classified as a multipotent lineage, because they differentiated into osteogenic, adipogenic, and chondrogenic lineages and, finally, they did not develop tumors. In conclusion, mesenchymal progenitor cells with multipotent differentiation potential and sufficient growth and proliferation abilities were able to be obtained from Necromys yolk sacs, therefore, we inferred that these cells may be promising for a wide range of applications in regenerative medicine.

Favaron, Phelipe Oliveira; Mess, Andrea; Will, Sonia Elisabete; Maiorka, Paulo Cesar; de Oliveira, Moacir Franco; Miglino, Maria Angelica

2014-01-01

127

Clone-forming ability and differentiation potential of migratory neural crest cells.  

PubMed

The neural crest of vertebrate embryos gives rise to a variety of differentiated cell types, including neuronal and non-neuronal cells of peripheral ganglia (sensory and autonomic), pigment cells, and mesectodermal derivatives. Neural crest cells were taken from quail embryos at the level encompassing mesencephalon and metencephalon and the developmental potentials were evaluated by culturing them as single cells on 3T3 feeder layers. Such conditions proved to be particularly favorable for survival, proliferation, and differentiation of quail neural crest cells. Two hundred and forty-three clones that contained from 1 to greater than 20,000 cells were analyzed after 7-10 days of culture. Phenotype analysis provided evidence for the existence of cells with extremely diverse developmental potencies. A few committed neuron progenitors were observed as well as some pluripotent cells, able to differentiate into several types of neurons, non-neuronal cells, and melanocytes, and many cells with intermediate developmental potencies. These cloning experiments revealed the striking heterogeneity of migrating neural crest cells in terms of their capacity for differentiation and their potential for proliferation. PMID:2455901

Baroffio, A; Dupin, E; Le Douarin, N M

1988-07-01

128

Clone-forming ability and differentiation potential of migratory neural crest cells.  

PubMed Central

The neural crest of vertebrate embryos gives rise to a variety of differentiated cell types, including neuronal and non-neuronal cells of peripheral ganglia (sensory and autonomic), pigment cells, and mesectodermal derivatives. Neural crest cells were taken from quail embryos at the level encompassing mesencephalon and metencephalon and the developmental potentials were evaluated by culturing them as single cells on 3T3 feeder layers. Such conditions proved to be particularly favorable for survival, proliferation, and differentiation of quail neural crest cells. Two hundred and forty-three clones that contained from 1 to greater than 20,000 cells were analyzed after 7-10 days of culture. Phenotype analysis provided evidence for the existence of cells with extremely diverse developmental potencies. A few committed neuron progenitors were observed as well as some pluripotent cells, able to differentiate into several types of neurons, non-neuronal cells, and melanocytes, and many cells with intermediate developmental potencies. These cloning experiments revealed the striking heterogeneity of migrating neural crest cells in terms of their capacity for differentiation and their potential for proliferation. Images

Baroffio, A; Dupin, E; Le Douarin, N M

1988-01-01

129

Precancerous Stem Cells Have the Potential for both Benign and Malignant Differentiation  

Microsoft Academic Search

Cancer stem cells (CSCs) have been identified in hematopoietic and solid tumors. However, their precursors—namely, precancerous stem cells (pCSCs) —have not been characterized. Here we experimentally define the pCSCs that have the potential for both benign and malignant differentiation, depending on environmental cues. While clonal pCSCs can develop into various types of tissue cells in immunocompetent mice without developing into

Li Chen; Rulong Shen; Yin Ye; Xin-An Pu; Xingluo Liu; Wenrui Duan; Jing Wen; Jason Zimmerer; Ying Wang; Yan Liu; Larry C. Lasky; Nyla A. Heerema; Danilo Perrotti; Keiko Ozato; Satomi Kuramochi-Miyagawa; Toru Nakano; Allen J. Yates; William E. Carson III; Haifan Lin; Sanford H. Barsky; Jian-Xin Gao; Dong-Yan Jin

2007-01-01

130

Differentiation stage determines potential of hematopoietic cells for reprogramming into induced pluripotent stem cells  

Microsoft Academic Search

The reprogramming of somatic cells into induced pluripotent stem (iPS) cells upon overexpression of the transcription factors Oct4, Sox2, Klf4 and cMyc is inefficient. It has been assumed that the somatic differentiation state provides a barrier for efficient reprogramming; however, direct evidence for this notion is lacking. Here, we tested the potential of mouse hematopoietic cells at different stages of

Sarah Eminli; Adlen Foudi; Matthias Stadtfeld; Nimet Maherali; Tim Ahfeldt; Gustavo Mostoslavsky; Hanno Hock; Konrad Hochedlinger

2009-01-01

131

The direct test of accuracy of calculated repulsive potential energy surfaces, based on differential scattering data  

Microsoft Academic Search

To check the accuracy of theoretically predicted repulsive potential surfaces, the differential scattering patterns are calculated and compared with measured ones. The measurements have been performed for the systems He-CO2, Ar-CO2, Ar-N2 in the angular range corresponding to interaction energies from a few tenths of an electron volt up to 5 eV. The significant disagreements between computed results and experimental

V. N. Khromov; V. B. Leonas

1979-01-01

132

Mesenchymal precursor cells maintain the differentiation and proliferation potentials of breast epithelial cells  

PubMed Central

Introduction Stromal-epithelial interactions play a fundamental role in tissue homeostasis, controlling cell proliferation and differentiation. Not surprisingly, aberrant stromal-epithelial interactions contribute to malignancies. Studies of the cellular and molecular mechanisms underlying these interactions require ex vivo experimental model systems that recapitulate the complexity of human tissue without compromising the differentiation and proliferation potentials of human primary cells. Methods We isolated and characterized human breast epithelial and mesenchymal precursors from reduction mammoplasty tissue and tagged them with lentiviral vectors. We assembled heterotypic co-cultures and compared mesenchymal and epithelial cells to cells in corresponding monocultures by analyzing growth, differentiation potentials, and gene expression profiles. Results We show that heterotypic culture of non-immortalized human primary breast epithelial and mesenchymal precursors maintains their proliferation and differentiation potentials and constrains their growth. We further describe the gene expression profiles of stromal and epithelial cells in co-cultures and monocultures and show increased expression of the tumor growth factor beta (TGF?) family member inhibin beta A (INHBA) in mesenchymal cells grown as co-cultures compared with monocultures. Notably, overexpression of INHBA in mesenchymal cells increases colony formation potential of epithelial cells, suggesting that it contributes to the dynamic reciprocity between breast mesenchymal and epithelial cells. Conclusions The described heterotypic co-culture system will prove useful for further characterization of the molecular mechanisms mediating interactions between human normal or neoplastic breast epithelial cells and the stroma, and will provide a framework to test the relevance of the ever-increasing number of oncogenomic alterations identified in human breast cancer.

2014-01-01

133

Shifted excitation Raman difference spectroscopy at multiple wavelengths for in-situ meat species differentiation  

NASA Astrophysics Data System (ADS)

Two miniaturized Raman measurement heads containing microsystem diode lasers emitting at 783 and 671 nm suitable for shifted excitation Raman difference spectroscopy (SERDS) were applied for the non-invasive in situ differentiation of selected meat species. This allows using the fingerprint characteristics of Raman spectra without a disturbing fluorescence background. At 783 nm, two emission lines with a spectral shift of 0.5 nm (7 cm-1) and optical powers of up to 110 mW were realized. For 671 nm excitation, the spectral shift amounts to 0.6 nm (12 cm-1) and optical powers of up to 40 mW were obtained. In both cases, meat Raman spectra could be recorded with integration times of 10 s. The investigations were carried out using selected cuts from the most commonly consumed meat species in the US and Europe, i.e. beef, pork, chicken, and turkey. A principal components analysis of the SERDS spectra revealed a clear separation of the meat species into four distinct groups for both excitation wavelengths. This classification is based on the myoglobin content and gradual differences of protein Raman band intensities and positions. The results demonstrate the potential of SERDS as rapid and non-destructive screening method for the discrimination of selected meat species.

Sowoidnich, Kay; Kronfeldt, Heinz-Detlef

2012-09-01

134

Nuclear reprogramming strategy modulates differentiation potential of induced pluripotent stem cells.  

PubMed

Bioengineered by ectopic expression of stemness factors, induced pluripotent stem (iPS) cells demonstrate embryonic stem cell-like properties and offer a unique platform for derivation of autologous pluripotent cells from somatic tissue sources. In the process of nuclear reprogramming, somatic tissues are converted to a pluripotent ground state, thus unlocking an unlimited potential to expand progenitor pools. Molecular dissection of nuclear reprogramming suggests that a residual memory derived from the original parental source, along with the remnants of the reprogramming process itself, leads to a biased potential of the bioengineered progeny to differentiate into target tissues such as cardiac cytotypes. In this way, iPS cells that fulfill pluripotency criteria may display heterogeneous profiles for lineage specification. Small molecule-based strategies have been identified that modulate the epigenetic state of reprogrammed cells and are optimized to erase the residual memory and homogenize the differentiation potential of iPS cells derived from distinct backgrounds. Here, we describe the salient components of the reprogramming process and their effect on the downstream differentiation capacity of the iPS populations in the context of cardiovascular regenerative applications. PMID:21207217

Martinez-Fernandez, Almudena; Nelson, Timothy J; Terzic, Andre

2011-04-01

135

The New Principle Of Sensor Differentiation By Electric Potential Bias In Metal Oxide Sensor Arrays  

NASA Astrophysics Data System (ADS)

We present a new method to differentiate the response of individual sensors in a metal oxide gas sensor array of E-nose type by application of varied electric potential biases and discuss how to employ the spatially distributed potential as a gas recognition pattern. The method is based on the impact, which the electric potential has upon the thermodynamic state of the metal oxide surface and on the gas adsorption processes. It is shown that the utilization of varied electric potentials yields a significant gas recognition power of E-nose, similar or even higher compared to the effect of conventional spatial temperature gradient differentiation. One advantage to use the potential distribution is the opportunity to have the whole continuous film as a sensor field, which would eliminate the influence of electrodes. The tests of a prototype of the multisensor array based on the considered method have shown its feasibility for getting high gas recognition and the capability to discriminate gas concentrations reliably.

Kiselev, I.; Sommer, M.; Sysoev, V. V.

2009-05-01

136

Large particle multiphoton flow cytometry to purify intact embryoid bodies exhibiting enhanced potential for cardiomyocyte differentiation.  

PubMed

Embryoid bodies (EBs) are large (>100 ?m) 3D microtissues composed of stem cells, differentiating cells and extracellular matrix (ECM) proteins that roughly recapitulate early embryonic development. EBs are widely used as in vitro model systems to study stem cell differentiation and the complex physical and chemical interactions contributing to tissue development. Though much has been learned about differentiation from EBs, the practical and technical difficulties of effectively probing and properly analyzing these 3D microtissues has limited their utility and further application. We describe advancement of a technology platform developed in our laboratory, multiphoton flow cytometry (MPFC), to detect and sort large numbers of intact EBs based on size and fluorescent reporters. Real-time and simultaneous measurement of size and fluorescence intensity are now possible, through the implementation of image processing algorithms in the MPFC software. We applied this platform to purify populations of EBs generated from murine induced pluripotent stem (miPS) cells exhibiting enhanced potential for cardiomyocyte differentiation either as a consequence of size or expression of NKX2-5, a homeodomain protein indicative of precardiac cells. Large EBs (330-400 ?m, diameter) purified soon after EB formation showed significantly higher potential to form cardiomyocytes at later time points than medium or small EBs. In addition, EBs expressing NKX2-5 soon after EB formation were more likely to form beating areas, indicative of cardiomyocyte differentiation, at later time points. Collectively, these studies highlight the ability of the MPFC to purify EBs and similar microtissues based on preferred features exhibited at the time of sorting or on features indicative of future characteristics or functional capacity. PMID:23759950

Buschke, D G; Vivekanandan, A; Squirrell, J M; Rueden, C T; Eliceiri, K W; Ogle, B M

2013-07-24

137

Standard CMOS Implementation of a Multiple-Valued Logic Signed-Digit Adder Based on Negative Differential-Resistance Devices  

Microsoft Academic Search

This paper presents MOS-NDR, a new prototyping technique for multiple-valued logic circuits combining MOS transistors and multipeak negative differential-resistance (NDR) devices such as resonant-tunneling diodes (RTDs). MOS-NDR emulates the folded current-voltage characteristics of NDR devices such as RTDs using only NMOS transistors, MOS-NDR has enabled the development of a fully integrated multivalued signed-digit full adder (SDFA) circuit by means of

Alejandro F. González; Mayukh Bhattacharya; Shriram Kulkarni; Pinaki Mazumder

2000-01-01

138

Characterization and differentiation potential of rabbit mesenchymal stem cells for translational regenerative medicine.  

PubMed

Mesenchymal stem cells (MSCs) derived from the adult bone marrow are multipotent stem cells that can give rise to lineages of bone, cartilage, muscle, fat, and others. The rabbit is a common preclinical model used for cardiovascular and orthopaedic applications. MSCs derived from the rabbit whole bone marrow are routinely investigated in these models for regenerative medicine applications. However, rabbit MSCs (rbMSCs) have not been extensively characterized in terms of immunophenotypic characteristics and differentiation potential and more specifically, in comparison to human MSCs (hMSCs). This study examined rbMSCs' surface antigens as well as their multipotent differentiation potential. In addition, the transduction efficiency of rbMSCs using a lentiviral vector with red fluorescent protein (RFP) as a method for labeling the cells for in vitro and in vivo use was also examined. RbMSCs were positive for CD44 and CD29 and negative for CD45 and CD14, which is similar to hMSCs, but rbMSCs did not express CD90. RbMSCs also expressed the pluripotent transcription factor, Sox2. The rbMSCs at early passages differentiated along the osteoblastic, chondrocytic, and adipocytic lineages. However, quantitative analyses demonstrated lower levels of differentiation markers for rabbit cells as compared to human cells. Transduction efficiency of 90.5% was observed for rbMSC transfected with RFP. Transduced cells also retained their osteogenic potential, but proliferation was reduced in comparison to nontransduced cells. This study demonstrates that MSCs isolated from the rabbit bone marrow have differences from human cells and should be considered when using rbMSCs in preclinical models for MSC regenerative medicine or tissue engineering strategies. PMID:24150687

Bakhtina, A; Tohfafarosh, M; Lichtler, A; Arinzeh, T Livingston

2014-03-01

139

Analysis on energy saving potential of integrated supermarket HVAC and refrigeration systems using multiple subcoolers  

Microsoft Academic Search

The paper presents a model-based analysis on the energy saving potential of supermarket HVAC (heating, ventilating, and air-conditioning) and refrigeration systems using multiple subcoolers among the high-temperature HVAC system, the medium-temperature refrigeration system, and the low-temperature refrigeration system. The principle of energy reduction is to have the higher COP (coefficient of performance) system generate more cooling capacity to increase the

Liang Yang; Chun-Lu Zhang

2010-01-01

140

Cognitive impairment and event-related potentials in paediatric multiple sclerosis: 2-year study  

Microsoft Academic Search

Approximately, 3–10% of patients with multiple sclerosis (MS) present a disease onset before the age of 18 years. Although\\u000a growing attention is dedicated to cognitive impairment and its functional consequences in paediatric MS, so far no study has\\u000a explored possible neurophysiologic correlates. The study’s aim was to describe event-related potentials in relationship with\\u000a cognitive performance in children and adolescents with MS

S. Lori; E. Portaccio; V. Zipoli; M. Giannini; S. Scarpelli; B. Goretti; M. P. Amato

141

Motor evoked potentials in multiple sclerosis patients without walking limitation: amplitude vs. conduction time abnormalities  

Microsoft Academic Search

We used Motor Evoked Potentials (MEPs), elicited by transcranial magnetic stimulation, for assessing a motor pathways dysfunction\\u000a in a selected group of Multiple Sclerosis (MS) patients, without limitation in walking. We selected 32 Relapsing Remitting\\u000a MS patients, in remission phase, with EDSS ? 3.5 and 20 healthy individuals with similar height and age distribution. We measured\\u000a the following MEP parameters: motor thresholds;

Andrea Gagliardo; Francesca Galli; Antonello Grippo; Aldo Amantini; Cristiana Martinelli; Maria Pia Amato; Walter Borsini

2007-01-01

142

Benchmarking in a differentially heated rotating annulus experiment: Multiple equilibria in the light of laboratory experiments and simulations  

NASA Astrophysics Data System (ADS)

In the framework of the German Science Foundation's (DFG) priority program 'MetStröm' various laboratory experiments have been carried out in a differentially heated rotating annulus configuration in order to test, validate and tune numerical methods to be used for modeling large-scale atmospheric processes. This classic experimental set-up is well known since the late 1940s and is a widely studied minimal model of the general mid-latitude atmospheric circulation. The two most relevant factors of cyclogenesis, namely rotation and meridional temperature gradient are quite well captured in this simple arrangement. The tabletop-size rotating tank is divided into three sections by coaxial cylindrical sidewalls. The innermost section is cooled whereas the outermost annular cavity is heated, therefore the working fluid (de-ionized water) in the middle annular section experiences differential heat flow, which imposes thermal (density) stratification on the fluid. At high enough rotation rates the isothermal surfaces tilt, leading to baroclinic instability. The extra potential energy stored in this unstable configuration is then converted into kinetic energy, exciting drifting wave patterns of temperature and momentum anomalies. The signatures of these baroclinic waves at the free water surface have been analysed via infrared thermography in a wide range of rotation rates (keeping the radial temperature difference constant) and under different initial conditions (namely, initial spin-up and "spin-down"). Paralelly to the laboratory simulations of BTU Cottbus-Senftenberg, five other groups from the MetStröm collaboration have conducted simulations in the same parameter regime using different numerical approaches and solvers, and applying different initial conditions and perturbations for stability analysis. The obtained baroclinic wave patterns have been evaluated via determining and comparing their Empirical Orthogonal Functions (EOFs), drift rates and dominant wave modes. Thus certain "benchmarks" have been created that can later be used as test cases for atmospheric numerical model validation. Both in the experiments and in the numerics multiple equilibrium states have been observed in the form of hysteretic behavior depending on the initial conditions. The precise quantification of these state and wave mode transitions may shed light to some aspects of the basic underlying dynamics of the baroclinic annulus configuration, still to be understood.

Vincze, Miklos; Harlander, Uwe; Borchert, Sebastian; Achatz, Ulrich; Baumann, Martin; Egbers, Christoph; Fröhlich, Jochen; Hertel, Claudia; Heuveline, Vincent; Hickel, Stefan; von Larcher, Thomas; Remmler, Sebastian

2014-05-01

143

Bit error rate of binary and quaternary DPSK signals with multiple differential feedback detection  

Microsoft Academic Search

A differentially coherent detection scheme with improved bit error rate (BER) performance is presented for differentially encoded binary and quaternary phase shift keying (PSK) modulation. The improvement is based on using L symbol detectors with delays of 1, 2, . . ., L symbol periods and on feeding back detected PSK symbols. Exact formulas for the bit error probability are

Franz Edbauer

1992-01-01

144

Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument  

NASA Astrophysics Data System (ADS)

We present a novel method for determining the multiplication of a spent nuclear fuel assembly with a Differential Die-Away Self-Interrogation (DDSI) instrument. The signal, which is primarily created by thermal neutrons, is measured with four 3He detector banks surrounding a spent fuel assembly. The Rossi-alpha distribution (RAD) at early times reflects coincident events from single fissions as well as fission chains. Because of this fact, the early time domain contains information about both the fissile material and spontaneous fission material in the assembly being measured. A single exponential function fit to the early time domain of the RAD has a die-away time proportional to the spent fuel assembly (SFA) multiplication. This correlation was tested by simulating assay of 44 different SFAs with the DDSI instrument. The SFA multiplication was determined with a variance of 0.7%.

Kaplan, Alexis C.; Henzl, Vladimir; Menlove, Howard O.; Swinhoe, Martyn T.; Belian, Anthony P.; Flaska, Marek; Pozzi, Sara A.

2014-09-01

145

Molecular characterization and differential expression of multiple goose dopamine D2 receptors.  

PubMed

Dopamine D2 receptor (DRD2) gene, a member of the dopamine receptors gene family, has been studied as a candidate gene for broodiness due to its special effects on avian prolactin secretion. Here, the genomic DNA and cDNA sequences of goose (Anser cygnoides) DRD2 gene were cloned and characterized for the first time. The goose DRD2 cDNA is 1353bp in length and encodes a protein of 450 amino acids. The length of goose DRD2 genomic DNA is 8350bp, including seven exons and six introns. We identified four goose DRD2 variants, which were generated due to alternative splicing. Bioinformatics analysis indicates that all the deduced DRD2 amino acid sequences contain seven putative transmembrane domains and four potential N-glycosylation sites. A phylogenetic tree based on amino acid sequences displays that the goose DRD2 protein is closely related to those of avian species. Semi-quantitative RT-PCR analysis demonstrates that the DRD2-1, DRD2-2 and DRD2-4 transcripts are differentially expressed in the pituitary, ovary, hypothalamus, as well as in the kidney, whereas the DRD2-3 transcript is widely expressed in all the examined tissues at different levels. Meanwhile, 54 single nucleotide polymorphisms (SNPs) and 4 insert-deletion (indel) variations were identified in the coding region and partial intron region of the goose DRD2 gene. Those findings will help us gain insight into the functions of the DRD2 gene in geese. PMID:24309374

Wang, Cui; Liu, Yi; Wang, Huiying; Wu, Huali; Gong, Shaoming; Chen, Weihu; He, Daqian

2014-02-10

146

A shift from adaptive to innate immunity: a potential mechanism of disease progression in multiple sclerosis.  

PubMed

Multiple sclerosis is postulated to be a T cell-mediated autoimmune disease characterised by a relapsing-remitting stage followed by a secondary progressive phase. The relapsing remitting phase may involve waves of proinflammatory Th1 and Th17 cells that infiltrate the nervous system, provoking a clinical attack. The activity of these cells is modulated by other populations of regulatory T cells and the balance between the pro-inflammatory and regulatory T cells is critical for determining disease activity. Promoting the activity of regulatory cells is a potentially beneficial therapeutic strategy, and probably contributes to the action of glatiramer acetate. The progressive phase of multiple sclerosis is believed to be secondary to neurodegenerative changes triggered by inflammation. The status of the innate immune system and its relationship to the stages of multiple sclerosis has been poorly defined until recently. However, recent data suggest that these results demonstrate abnormalities of dendritic cell activation or maturation may underlie the transition to the progressive phase of the disease. Preventing this transition, perhaps by acting at the level of the innate immune system, is an important treatment goal. The identification of biomarkers to predict disease course and treatment response is a major challenge in multiple sclerosis research. Studies using antigen arrays have identified antibody patterns related to CNS antigens and heat-shock proteins that are associated with different disease stages and with response to therapy. In the future, such antibody repertoires could be used as biomarkers for the diagnosis and evaluation of patients with multiple sclerosis, for matching treatments to individual patients and, potentially, to identify healthy individuals at risk for this autoimmune disease. PMID:18317671

Weiner, Howard L

2008-03-01

147

IL-12 directs further maturation of ex vivo differentiated NK cells with improved therapeutic potential.  

PubMed

The possibility to modulate ex vivo human NK cell differentiation towards specific phenotypes will contribute to a better understanding of NK cell differentiation and facilitate tailored production of NK cells for immunotherapy. In this study, we show that addition of a specific low dose of IL-12 to an ex vivo NK cell differentiation system from cord blood CD34(+) stem cells will result in significantly increased proportions of cells with expression of CD62L as well as KIRs and CD16 which are preferentially expressed on mature CD56(dim) peripheral blood NK cells. In addition, the cells displayed decreased expression of receptors such as CCR6 and CXCR3, which are typically expressed to a lower extent by CD56(dim) than CD56(bright) peripheral blood NK cells. The increased number of CD62L and KIR positive cells prevailed in a population of CD33(+)NKG2A(+) NK cells, supporting that maturation occurs via this subtype. Among a series of transcription factors tested we found Gata3 and TOX to be significantly downregulated, whereas ID3 was upregulated in the IL-12-modulated ex vivo NK cells, implicating these factors in the observed changes. Importantly, the cells differentiated in the presence of IL-12 showed enhanced cytokine production and cytolytic activity against MHC class I negative and positive targets. Moreover, in line with the enhanced CD16 expression, these cells exhibited improved antibody-dependent cellular cytotoxicity for B-cell leukemia target cells in the presence of the clinically applied antibody rituximab. Altogether, these data provide evidence that IL-12 directs human ex vivo NK cell differentiation towards more mature NK cells with improved properties for potential cancer therapies. PMID:24498025

Lehmann, Dorit; Spanholtz, Jan; Sturtzel, Caterina; Tordoir, Marleen; Schlechta, Bernhard; Groenewegen, Dirk; Hofer, Erhard

2014-01-01

148

On the differential diagnosis of multiple personality in the forensic context?  

Microsoft Academic Search

The problems of diagnosing multiple personality disorder in a forensic context are discussed, and illustrated by the case of Stute u. Kenneth Birrnchi (1979), a defendant who was both charged with first degree murder and suspected of having the disorder. Because of the secondary gain (e.g., avoiding the death penalty) associated with the diagnosis of multiplicity in such a case,

Martin T. Orne; David F. Dinges; Emily Carota Orne

1984-01-01

149

Potentiating role of IGFBP-2 on IGF-II-stimulated alkaline phosphatase activity in differentiating osteoblasts.  

PubMed

The insulin-like growth factor (IGF) system plays an important role in the autocrine and paracrine regulation of bone formation and remodeling. The aim of this study was to evaluate the role of the autocrine IGF system during osteogenic differentiation in rat tibial osteoblasts (ROB) in culture. In this in vitro model, the stages of osteogenesis studied were S1, corresponding to the onset of alkaline phosphatase (AP) expression (days 0-3); S2, coincident with the peak of AP expression in differentiation culture conditions (days 4-6), and S3, corresponding to the onset of mineral deposition in the extracellular matrix (days 7-9). The results showed that conditioned medium of ROB contains greater amounts of IGF-II than IGF-I at all differentiation stages. Both peptides showed the highest concentrations on day 3 of differentiation (end of S1). All IGF-binding proteins (IGFBPs), except IGFBP-1 and -6, were detected, and IGFBP-2 was the most abundant IGFBP present in the conditioned media, and its degradation increased from S1 to S3. By semiquantitative RT-PCR, IGF-I and IGF-II were highly expressed on days 3 and 6, whereas IGFBP-2 was constantly expressed. We focused our study on the role of IGF-II and IGFBP-2 on the synthesis of AP, an early marker of osteoblast maturation. The results showed that a significant increase in AP expression was induced by IGF-II added to the differentiating osteoblasts continuously or in S1 but not in S2 or S3. IGFBP-2 was able to potentiate endogenous and exogenous IGF-II-dependent stimulation of AP activity, and its proteolytic degradation in late stages of osteogenesis (S2 and S3) was highly correlated with the increase of active matrix metalloproteinase-2 in the CM and with the decreased efficacy of IGF-II action. These data suggest that IGFBP-2, at nearly equimolar concentration with IGF-II, plays a potentiating role in IGF-II action on ROB differentiation in vitro. PMID:14665441

Palermo, Claudia; Manduca, Paola; Gazzerro, Elisabetta; Foppiani, Luca; Segat, Daniela; Barreca, Antonina

2004-04-01

150

Isolation, characterization and neural differentiation potential of amnion derived mesenchymal stem cells.  

PubMed

Mesenchymal stem cells (MSCs) derived from amnion are considered to be adult stem cells that can be easily obtained in large quantities by a less invasive method in comparison to bone marrow-derived MSCs (BM-MSCs). However; the biological properties and the differentiation capacity of amnion-derived MSCs (AM-MSCs) are still poorly characterized. The objectives of this study were to isolate, characterize and explore the potential of AM-MSCs in differentiating toward neural lineage in comparison to those of BM-MSCs. To isolate AM-MSCs, amnion was digested with trypsin-EDTA and cultured in Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum. The expression profiles of several MSC markers were examined by flow cytometry. AM-MSCs from passage 3-5 were used for adipogenic, osteogenic and neural differentiation assays by culturing in appropriate induction media. The expression of several neural marker genes, including MAP-2, GFAP and beta-tubulin III in AM-MSCs was determined by quantitative real time-PCR. The expression of neural-specific markers, MAP-2 and beta-tubulin III, was subsequently confirmed by immunocytochemistry using confocal laser microscope. The results demonstrated that AM-MSCs could be easily expanded to 18-20 passages while maintaining the undifferentiated state and exhibiting MSC markers (CD73, CD90, and CD105) but do not express the hematopoietic markers (CD34 and CD45). Similar to BM-MSCs, AM-MSCs were able to differentiate to several mesodermal-lineages including adipocytes and osteoblasts. Moreover; these cells could be induced to differentiate to neuron-like cells as characterized by cell morphology and the expression of several neural markers including MAP-2, GFAP and beta-tubulin III. The present study demonstrated that AM-MSCs can be easily obtained and expanded in culture. These cells also have transdifferentiation capacity as evidenced by their neural differentiation potential. According to the results, amnion can be used as an alternative source of MSCs for stem cell therapy in neurodegenerative diseases. PMID:21294413

Manochantr, Sirikul; Tantrawatpan, Chairat; Kheolamai, Pakpoom; U-pratya, Yaowaluk; Supokawej, Aungkura; Issaragrisil, Surapol

2010-12-01

151

EEN regulates the proliferation and survival of multiple myeloma cells by potentiating IGF-1 secretion.  

PubMed

The molecular mechanisms of multiple myeloma are not well defined. EEN is an endocytosis-regulating molecule. Here we report that EEN regulates the proliferation and survival of multiple myeloma cells, by regulating IGF-1 secretion. In the present study, we observed that EEN expression paralleled with cell proliferation, EEN accelerated cell proliferation, facilitated cell cycle transition from G1 to S phase by regulating cyclin-dependent kinases (CDKs) pathway, and delayed cell apoptosis via Bcl2/Bax-mitochondrial pathway. Mechanistically, we found that EEN was indispensable for insulin-like growth factor-1 (IGF-1) secretion and the activation of protein kinase B-mammalian target of rapamycin (Akt-mTOR) pathway. Exogenous IGF-1 overcame the phenotype of EEN depletion, while IGF-1 neutralization overcame that of EEN over-expression. Collectively, these data suggest that EEN may play a pivotal role in excessive cell proliferation and insufficient cell apoptosis of bone marrow plasma cells in multiple myeloma. Therefore, EEN may represent a potential diagnostic marker or therapeutic target for multiple myeloma. PMID:24704450

Huang, Er-Wen; Xue, Sheng-Jiang; Li, Xiao-Yan; Xu, Suo-Wen; Cheng, Jian-Ding; Zheng, Jin-Xiang; Shi, He; Lv, Guo-Li; Li, Zhi-Gang; Li, Yue; Liu, Chang-Hui; Chen, Xiao-Hui; Liu, Hong; Li, Jie; Liu, Chao

2014-05-01

152

Multiplication and Differentiation of Trypanosoma Cruzi in an Insect Cell Culture System.  

National Technical Information Service (NTIS)

Trypanosoma cruzi was successfully cultured in an insect cell culture system. Transformation of trypomastigote forms from infected mouse blood into dividing amastigote forms was observed. Differentiation of the amastigote forms into large and predictable ...

D. E. Wood A. C. Pipkin

1968-01-01

153

At the crossroads of differentiation and proliferation: Precise control of cell-cycle changes by multiple signaling pathways in Drosophila follicle cells  

PubMed Central

Here, we discuss the findings to date about genes and pathways required for regulation of somatic follicle-cell proliferation and differentiation during Drosophila oogenesis and demonstrate how loss of these genes contributes to the tumorigenic potential of mutant cells. Follicle cells undergo cell-fate determination through stepwise activation of multiple signaling pathways, including the Notch, Hedgehog, Wingless, janus kinase/STAT, and JNK pathways. In addition, changes in DNA replication and cellular growth depend on the spatial and temporal activation of the mitotic cycle-endocycle and endocycle-gene amplification cell-cycle switches and insulin-dependent monitoring of cellular health; systemic loss of these pathways contributes to loss of controlled cellular proliferation, loss of differentiation/growth, and aberrant cell polarity in follicle cells. We also highlight the effects of the neoplastic and Hippo pathways on the cell cycle and cellular proliferation in promoting normal development and conclude that lack of coordination of multiple signaling pathways promotes conditions favorable for tumorigenesis.

Klusza, Stephen; Deng, Wu-Min

2013-01-01

154

Multiple Dirac points and perfect transmission in graphene with a dimerlike potential  

NASA Astrophysics Data System (ADS)

In this work, we investigate electronic band structures and transport properties in dimerlike graphene superlattices (DGSLs), where the modulated potentials of square barrier A and well B on graphene are arranged as S(m) = (AB)m(BA)m. Here m is the repeated number of units. It is found that the mirror symmetry of the potential distribution on graphene can induce extra Dirac points (DPs), which originates from the dimerlike positional correlations in the system. The induced DPs, which are exactly located at the energy corresponding to zero averaged wave number, do not exist in the periodic graphene superlattices of (AB)m. The number and the position of DPs in the zero averaged wave number gap of DGSL can be manipulated. Correspondingly, multiple perfect transmissions are observed at the resonant modes. Moreover, the conductance for DGSL presents extra resonant peaks accompanying with the emergence of the induced DPs. The investigations may have potential applications in graphene-based electronic devices.

Zhang, Rui-Li; Gao, Han-Tian; Zhou, Yu; Fan, Ren-Hao; Qi, Dong-Xiang; Peng, Ru-Wen; Huang, Run-Sheng; Wang, Mu

2013-09-01

155

Numerical solution of potential flow about arbitrary 2-dimensional multiple bodies  

NASA Technical Reports Server (NTRS)

A procedure for the finite-difference numerical solution of the lifting potential flow about any number of arbitrarily shaped bodies is given. The solution is based on a technique of automatic numerical generation of a curvilinear coordinate system having coordinate lines coincident with the contours of all bodies in the field, regardless of their shapes and number. The effects of all numerical parameters involved are analyzed and appropriate values are recommended. Comparisons with analytic solutions for single Karman-Trefftz airfoils and a circular cylinder pair show excellent agreement. The technique of application of the boundary-fitted coordinate systems to the numerical solution of partial differential equations is illustrated.

Thompson, J. F.; Thames, F. C.

1982-01-01

156

Aqueous ethanolic extract of Tinospora cordifolia as a potential candidate for differentiation based therapy of glioblastomas.  

PubMed

Glioblastomas are the most aggressive primary brain tumors and their heterogeneity and complexity often renders them non responsive to various conventional treatments. Search for herbal products having potential anti-cancer activity is an active area of research in the Indian traditional system of medicine i.e., Ayurveda. Tinospora cordifolia, also named as 'heavenly elixir' is used in various ayurvedic decoctions as panacea to treat several body ailments. The current study investigated the anti-brain cancer potential of 50% ethanolic extract of Tinospora cordifolia (TCE) using C6 glioma cells. TCE significantly reduced cell proliferation in dose-dependent manner and induced differentiation in C6 glioma cells, resulting in astrocyte-like morphology as indicated by phase contrast images, GFAP expression and process outgrowth data of TCE treated cells which exhibited higher number and longer processes than untreated cells. Reduced proliferation of cells was accompanied by enhanced expression of senescence marker, mortalin and its translocation from perinuclear to pancytoplasmic spaces. Further, TCE showed anti-migratory and anti-invasive potential as depicted by wound scratch assay and reduced expression of plasticity markers NCAM and PSA-NCAM along with MMP-2 and 9. On analysis of the cell cycle and apoptotic markers, TCE treatment was seen to arrest the C6 cells in G0/G1 and G2/M phase, suppressing expression of G1/S phase specific protein cyclin D1 and anti-apoptotic protein Bcl-xL, thus supporting its anti-proliferative and apoptosis inducing potential. Present study provides the first evidence for the presence of anti-proliferative, differentiation-inducing and anti-migratory/anti-metastatic potential of TCE in glioma cells and possible signaling pathways involved in its mode of action. Our primary data suggests that TCE and its active components may prove to be promising phytotherapeutic interventions in gliobalstoma multiformae.  PMID:24205314

Mishra, Rachana; Kaur, Gurcharan

2013-01-01

157

Differentiation between monomorphic ventricular tachycardia and sinus tachycardia based on the right ventricular evoked potential.  

PubMed

The differentiation between ventricular tachycardia (VT) and sinus tachycardia (ST) is problematic in some patients with implantable defibrillators and/or antitachycardia pacemakers. The integral of the ventricular endocardial evoked response, or paced depolarization integral (PDI), has been demonstrated to undergo characteristic changes with a variety of stimuli including catecholamines, pacing rate, and exercise. We hypothesized that the PDI recorded from a unipolar transvenous right ventricular endocardial catheter would differentiate VT from ST. The PDI was calculated from a unipolar pacing stimulus, delivered via a cathode in the right ventricular apex, and the reference electrode, a quadripolar catheter positioned in the superior vena cava. PDIs were measured in 22 patients during VT and sinus rhythm. The PDI measured during sinus rhythm was 579 +/- 240 microV-sec and the PDI during VT was 894 +/- 411 microV-sec (P < 0.001). In a subset of seven patients, PDIs were measured during VT, sinus rhythm, and ST induced by catecholamine infusion or exercise. In this subset, the PDI during sinus rhythm was 645 +/- 295 microV-sec, during ST 588 +/- 308 microV-sec (9% decrease from sinus, P = 0.05), and during VT 863 +/- 342 microV-sec (33.9% increase, P = 0.01). These data indicate that the measurement of the PDI is potentially useful in differentiating VT from ST. PMID:1279532

Belz, M K; Ellenbogen, K A; Camm, A J; Paul, V E; Rogers, R; Dawson, A K

1992-11-01

158

First-line treatment with bortezomib rapidly stimulates both osteoblast activity and bone matrix deposition in patients with multiple myeloma, and stimulates osteoblast proliferation and differentiation in vitro  

PubMed Central

Objectives: The aim of the study was to investigate the effect of bortezomib on osteoblast proliferation and differentiation, as well as on bone matrix deposition for the first time in bisphosphonate-naïve, previously untreated patients with myeloma. Methods: Twenty newly diagnosed patients received four cycles of bortezomib treatment, initially as monotherapy and then combined with a glucocorticoid from cycle two to four. Bone remodeling markers were monitored closely during treatment. Furthermore, the effects of bortezomib and a glucocorticoid on immature and mature osteoblasts were also studied in vitro. Results: Treatment with bortezomib caused a significant increase in bone-specific alkaline phosphatase and pro-collagen type I N-terminal propeptide, a novel bone formation marker. The addition of a glucocorticoid resulted in a transient decrease in collagen deposition. In vitro bortezomib induced osteoblast proliferation and differentiation. Differentiation but not proliferation was inhibited by glucocorticoid treatment. Conclusions: Bortezomib used as first-line treatment significantly increased collagen deposition in patients with multiple myeloma and osteolytic lesions, but the addition of a glucocorticoid to the treatment transiently inhibited the positive effect of bortezomib, suggesting that bortezomib may result in better healing of osteolytic lesions when used without glucocorticoids in patients that have obtained remission with a previous therapy. The potential bone-healing properties of single-agent bortezomib are currently being explored in a clinical study in patients who have undergone high-dose therapy and autologous stem cell transplantation.

Lund, Thomas; S?e, Kent; Abildgaard, Niels; Garnero, Patrick; Pedersen, Per T; Ormstrup, Tina; Delaisse, Jean-Marie; Plesner, Torben

2010-01-01

159

Calculation of the flux attenuation and multiple scattering correction factors in time of flight technique for double differential cross section measurements.  

National Technical Information Service (NTIS)

Using Monte Carlo method technique, a computer code which simulates the time of flight experiment to measure double differential cross section was developed. The correction factor for flux attenuation and multiple scattering, that make a deformation to th...

G. Martin M. Coca R. Capote

1996-01-01

160

Human amniotic fluid stem cells possess the potential to differentiate into primordial follicle oocytes in vitro.  

PubMed

Previous reports have demonstrated that embryonic stem cells were capable of differentiating into primordial germ cells through the formation of embryoid bodies that subsequently generated oocyte-like cells (OLCs). Such a process could facilitate studies of primordial follicle oocyte development in vitro and regenerative medicine. To investigate the pluripotency of human amniotic fluid stem cells (hAFSCs) and their ability to differentiate into germ cells, we isolated a CD117(+)/CD44(+) hAFSC line that showed fibroblastoid morphology and intrinsically expressed both stem cell markers (OCT4, NANOG, SOX2) and germ cell markers (DAZL, STELLA). To encourage differentiation into OLCs, the hAFSCs were first cultured in a medium supplemented with 5% porcine follicular fluid for 10 days. During the induction period, cell aggregates formed and syntheses of steroid hormones were detected; some OLCs and granulosa cell-like cells could be loosened from the surface of the culture dish. Cell aggregates were collected and replated in oocyte culture medium for an additional 7-10 days. OLCs ranging from 50 to 120 ?m presenting zona pellucida were observed in cumulus-oocyte complexes; some OLCs developed spontaneously into multicell structures similar to preimplantation embryos. Approximately 2% of the hAFSCs differentiated to meiotic germ cells that expressed folliculogenesis- and oogenesis-associated markers. Although the in vitro maturation and fertilization potentials are as yet unproven, short-term (<25 days) and high-efficiency (>2%) derivation of OLCs from hAFSCs might provide a new approach to the study of human germ cell development in vitro. PMID:24571984

Yu, Xiaoli; Wang, Ning; Qiang, Rong; Wan, Qianhui; Qin, Mingming; Chen, Shuai; Wang, Huayan

2014-04-01

161

Hypoxic/normoxic preconditioning increases endothelial differentiation potential of human bone marrow CD133+ cells.  

PubMed

CD133+ cells are hemangioblasts that have capacity to generate into both hematopoietic and endothelial cells (ECs). Hypoxia/normoxia has shown to be the regulator of the balance between stemness and differentiation. In this study we performed Agilent's whole human genome oligo microarray analysis and examined the differentiation potential of the bone-marrow-derived CD133+ cells after hypoxic/normoxic preconditioning of CD133+ cells. Results showed that there was no significant increase in erythroid colony forming unit (CFU-E) and CFU-granulocyte, erythrocyte, monocyte, and megakaryocyte formation with cells treated under hypoxia/normoxia. However, a significant increment of EC forming unit at 24 h (143.2 +/- 8.0%) compared to 0 h (100 +/- 11.4%) was observed in CFU-EC analysis. Reverse transcription-polymerase chain reaction and immunostaining analysis showed that the differentiated cells diminished hematopoietic stem cell surface markers and acquired the gene markers and functional phenotype of ECs. The transcriptome profile revealed a cluster of 232 downregulated and 498 upregulated genes in cells treated for 24 h under hypoxia. The upregulated genes include angiogenic genes, angiogenic growth factor genes, angiogenic cytokine and chemokine genes, as well as angiogenic-positive regulatory genes, including FGFBP1, PDGFB, CCL15, CXCL12, CXCL6, IL-6, PTN, EREG, ERBB2, EDG5, FGF3, FHF2, GDF15, JUN, L1CAM, NRG1, NGFR, and PDGFB. On the other hand, angiogenesis inhibitors and related genes, including IL12A, MLLT7, STAB1, and TIMP2, are downregulated. Taken together, hypoxic/normoxic preconditioning may lead to the differentiation of CD133+ cells toward endothelial lineage, which may improve the current clinical trial studies. PMID:20073989

Ong, Lee-Lee; Li, Wenzhong; Oldigs, Jana Kristina; Kaminski, Alexander; Gerstmayer, Bernhard; Piechaczek, Christoph; Wagner, Wolfgang; Li, Ren-Ke; Ma, Nan; Steinhoff, Gustav

2010-10-01

162

Precancerous stem cells have the potential for both benign and malignant differentiation.  

PubMed

Cancer stem cells (CSCs) have been identified in hematopoietic and solid tumors. However, their precursors-namely, precancerous stem cells (pCSCs) -have not been characterized. Here we experimentally define the pCSCs that have the potential for both benign and malignant differentiation, depending on environmental cues. While clonal pCSCs can develop into various types of tissue cells in immunocompetent mice without developing into cancer, they often develop, however, into leukemic or solid cancers composed of various types of cancer cells in immunodeficient mice. The progress of the pCSCs to cancers is associated with the up-regulation of c-kit and Sca-1, as well as with lineage markers. Mechanistically, the pCSCs are regulated by the PIWI/AGO family gene called piwil2. Our results provide clear evidence that a single clone of pCSCs has the potential for both benign and malignant differentiation, depending on the environmental cues. We anticipate pCSCs to be a novel target for the early detection, prevention, and therapy of cancers. PMID:17356702

Chen, Li; Shen, Rulong; Ye, Yin; Pu, Xin-An; Liu, Xingluo; Duan, Wenrui; Wen, Jing; Zimmerer, Jason; Wang, Ying; Liu, Yan; Lasky, Larry C; Heerema, Nyla A; Perrotti, Danilo; Ozato, Keiko; Kuramochi-Miyagawa, Satomi; Nakano, Toru; Yates, Allen J; Carson, William E; Lin, Haifan; Barsky, Sanford H; Gao, Jian-Xin

2007-01-01

163

Precancerous Stem Cells Have the Potential for both Benign and Malignant Differentiation  

PubMed Central

Cancer stem cells (CSCs) have been identified in hematopoietic and solid tumors. However, their precursors—namely, precancerous stem cells (pCSCs) —have not been characterized. Here we experimentally define the pCSCs that have the potential for both benign and malignant differentiation, depending on environmental cues. While clonal pCSCs can develop into various types of tissue cells in immunocompetent mice without developing into cancer, they often develop, however, into leukemic or solid cancers composed of various types of cancer cells in immunodeficient mice. The progress of the pCSCs to cancers is associated with the up-regulation of c-kit and Sca-1, as well as with lineage markers. Mechanistically, the pCSCs are regulated by the PIWI/AGO family gene called piwil2. Our results provide clear evidence that a single clone of pCSCs has the potential for both benign and malignant differentiation, depending on the environmental cues. We anticipate pCSCs to be a novel target for the early detection, prevention, and therapy of cancers.

Chen, Li; Shen, Rulong; Ye, Yin; Pu, Xin-An; Liu, Xingluo; Duan, Wenrui; Wen, Jing; Zimmerer, Jason; Wang, Ying; Liu, Yan; Lasky, Larry C.; Heerema, Nyla A.; Perrotti, Danilo; Ozato, Keiko; Kuramochi-Miyagawa, Satomi; Nakano, Toru; Yates, Allen J.; Carson III, William E.; Lin, Haifan; Barsky, Sanford H.; Gao, Jian-Xin

2007-01-01

164

A path integral method for coarse-graining noise in stochastic differential equations with multiple time scales  

NASA Astrophysics Data System (ADS)

We present a new path integral method to analyze stochastically perturbed ordinary differential equations with multiple time scales. The objective of this method is to derive from the original system a new stochastic differential equation describing the system’s evolution on slow time scales. For this purpose, we start from the corresponding path integral representation of the stochastic system and apply a multi-scale expansion to the associated path integral kernel of the corresponding Lagrangian. As a concrete example, we apply this expansion to a system that arises in the study of random dispersion fluctuations in dispersion-managed fiber-optic communications. Moreover, we show that, for this particular example, the new path integration method yields the same result at leading order as an asymptotic expansion of the associated Fokker-Planck equation.

Schäfer, Tobias; Moore, Richard O.

2011-01-01

165

Differential effect of sterols on dipole potential in hippocampal membranes: implications for receptor function.  

PubMed

Dipole potential is the potential difference within the membrane bilayer, which originates due to the nonrandom arrangement of lipid dipoles and water molecules at the membrane interface. In this work, we have explored the possible correlation between functional modulation of a G protein-coupled receptor (the serotonin(1A) receptor) and membrane dipole potential, under conditions of altered membrane sterol composition. We have previously shown that the ligand binding activity of the hippocampal serotonin(1A) receptor is reduced upon cholesterol depletion and could be restored upon replenishment with cholesterol. Interestingly, when the replenishment was carried out with an immediate biosynthetic precursor of cholesterol (7-DHC), differing with cholesterol merely in a double bond, the ligand binding activity of the receptor was not restored. In order to understand the mechanistic framework of receptor-cholesterol interaction, we carried out dipole potential measurements of hippocampal membranes under these conditions, by the dual wavelength ratiometric approach using an electrochromic probe (di-8-ANEPPS). We show here that dipole potential of hippocampal membranes is reduced upon progressive depletion of cholesterol and is restored upon replenishment with cholesterol, but not with 7-DHC. Our results show that the recovery of ligand binding activity of the serotonin(1A) receptor upon replenishment with cholesterol (but not with 7-DHC) could be related to the differential ability of these closely related sterols to modulate membrane dipole potential. We conclude that subtle changes in membrane dipole potential could be crucial in understanding the complex interplay between membrane lipids and proteins in the cellular milieu. PMID:23201544

Singh, Pushpendra; Haldar, Sourav; Chattopadhyay, Amitabha

2013-03-01

166

Differential calcium dependence in basal and forskolin-potentiated spontaneous transmitter release in basolateral amygdala neurons.  

PubMed

Action potential-independent transmitter release, or spontaneous release, is postulated to produce multiple postsynaptic effects (e.g., maintenance of dendritic spines and suppression of local dendritic protein synthesis). Potentiation of spontaneous release may contribute to the precise modulation of synaptic function. However, the expression mechanism underlying potentiated spontaneous release remains unclear. In this study, we investigated the involvement of extracellular and intracellular calcium in basal and potentiated spontaneous release. Miniature excitatory postsynaptic currents (mEPSCs) of the basolateral amygdala neurons in acute brain slices were recorded. Forskolin, an adenylate cyclase activator, increased mEPSC frequency, and the increase lasted at least 25 min after washout. Removal of the extracellular calcium decreased mEPSC frequency in both naïve and forskolin-treated slices. On the other hand, chelation of intracellular calcium by BAPTA-AM decreased mEPSC frequency in naïve, but not in forskolin-treated slices. A blockade of the calcium-sensing receptor (CaSR) resulted in an increase in mEPSC frequency in forskolin-treated, but not in naïve slices. These findings indicate that forskolin-induced potentiation is accompanied by changes in the mechanisms underlying Ca(2+)-dependent spontaneous release. PMID:22989859

Miura, Yuki; Naka, Masamitsu; Matsuki, Norio; Nomura, Hiroshi

2012-10-31

167

The potential of mesenchymal stromal cells as a novel cellular therapy for multiple sclerosis.  

PubMed

Multiple sclerosis (MS) is an inflammatory neurodegenerative disease of the CNS for which only partially effective therapies exist. Intense research defining the underlying immune pathophysiology is advancing both the understanding of MS as well as revealing potential targets for disease intervention. Mesenchymal stromal cell (MSC) therapy has the potential to modulate aberrant immune responses causing demyelination and axonal injury associated with MS, as well as to repair and restore damaged CNS tissue and cells. This article reviews the pathophysiology underlying MS, as well as providing a cutting-edge perspective into the field of MSC therapy based upon the experience of authors intrinsically involved in MS and MSC basic and translational science research. PMID:22642335

Auletta, Jeffery J; Bartholomew, Amelia M; Maziarz, Richard T; Deans, Robert J; Miller, Robert H; Lazarus, Hillard M; Cohen, Jeffrey A

2012-05-01

168

IGFBP-rP1, a potential molecule associated with colon cancer differentiation  

PubMed Central

Background In our previous studies, we have demonstrated that insulin-like growth factor binding protein-related protein1 (IGFBP-rP1) played its potential tumor suppressor role in colon cancer cells through apoptosis and senescence induction. In this study, we will further uncover the role of IGFBP-rP1 in colon cancer differentiation and a possible mechanism by revealing responsible genes. Results In normal colon epithelium, immunohistochemistry staining detected a gradient IGFBP-rP1 expression along the axis of the crypt. IGFBP-rP1 strongly expressed in the differentiated cells at the surface of the colon epithelium, while weakly expressed at the crypt base. In colon cancer tissues, the expression of IGFBP-rP1 correlated positively with the differentiation status. IGFBP-rP1 strongly expressed in low grade colorectal carcinoma and weakly expressed in high grade colorectal carcinoma. In vitro, transfection of PcDNA3.1(IGFBP-rP1) into RKO, SW620 and CW2 cells induced a more pronounced anterior-posterior polarity morphology, accompanied by upregulation with alkaline phosphatase (AKP) activity. Upregulation of carcino-embryonic antigen (CEA) was also observed in SW620 and CW2 transfectants. The addition of IGFBP-rP1 protein into the medium could mimic most but not all effects of IGFBP-rP1 cDNA transfection. Seventy-eight reproducibly differentially expressed genes were detected in PcDNA3.1(IGFBP-rP1)-RKO transfectants, using Affymetrix 133 plus 2.0 expression chip platform. Directed Acyclic Graph (DAG) of the enriched GO categories demonstrated that differential expression of the enzyme regulator activity genes together with cytoskeleton and actin binding genes were significant. IGFBP-rP1 could upreguate Transgelin (TAGLN), downregulate SRY (sex determining region Y)-box 9(campomelic dysplasia, autosomal sex-reversal) (SOX9), insulin receptor substrate 1(IRS1), cyclin-dependent kinase inhibitor 2B (p15, inhibits CDK4) (CDKN2B), amphiregulin(schwannoma-derived growth factor) (AREG) and immediate early response 5-like(IER5L) in RKO, SW620 and CW2 colon cancer cells, verified by Real time Reverse Transcription Polymerase Chain Reaction (rtRT-PCR). During sodium butyrate-induced Caco2 cell differentiation, IGFBP-rP1 was upregulated and the expression showed significant correlation with the AKP activity. The downregulation of IRS1 and SOX9 were also induced by sodium butyrate. Conclusion IGFBP-rP1 was a potential key molecule associated with colon cancer differentiation. Downregulation of IRS1 and SOX9 may the possible key downstream genes involved in the process.

2010-01-01

169

Chaotic differential Harmony Search algorithm applied to power economic dispatch of generators with multiple fuel options  

Microsoft Academic Search

The Harmony Search (HS) algorithm was originally conceptualized using the musical improvisation process of searching for a perfect state of harmony. The HS algorithm uses a random search, which is based on random selection, memory consideration, and pitch adjusting. This paper proposes a modified HS approach combined with differential evolution and chaotic sequences to solve the economic load dispatch problem

Leandro dos Santos Coelho; Diego Luis de Andrade Bernert; Viviana Cocco Mariani

2010-01-01

170

A Generalized Logistic Regression Procedure to Detect Differential Item Functioning among Multiple Groups  

ERIC Educational Resources Information Center

We present an extension of the logistic regression procedure to identify dichotomous differential item functioning (DIF) in the presence of more than two groups of respondents. Starting from the usual framework of a single focal group, we propose a general approach to estimate the item response functions in each group and to test for the presence…

Magis, David; Raiche, Gilles; Beland, Sebastien; Gerard, Paul

2011-01-01

171

Activities for Differentiated Instruction Addressing All Levels of Bloom's Taxonomy and Eight Multiple Intelligences.  

ERIC Educational Resources Information Center

This manuscript contains 13 curriculum units designed to enhance differentiated instruction for learners with special needs from grades 1-12, including gifted students. It integrates Benjamin S. Bloom's levels of cognitive understanding with Howard Gardner's eight domains of intelligence to provide a framework for individualized instruction. Each…

Rule, Audrey C., Ed.; Lord, Linda Hurley, Ed.

172

The concentration-estimation problem for multiple-wavelength differential absorption lidar  

SciTech Connect

We are seeking to develop a reliable methodology for multi-chemicai detection and discrimination based upon multi-wavelength differential absorption lidar measurements. In this paper, we summarize some preliminary results of our efforts to devise suitable concentration-estimation algorithms for use in detection and discrimination schemes.

Payne, A.N.

1994-07-01

173

Bayesian Robust Inference for Differential Gene Expression in Microarrays with Multiple Samples  

Microsoft Academic Search

Summary. We consider the problem of identifying differentially expressed genes under different conditions using gene expression microarrays. Because of the many steps involved in the experimental process, from hybridization to image analysis, cDNA microarray data often contain outliers. For example, an outlying data value could occur because of scratches or dust on the surface, imperfections in the glass, or imperfections

Raphael Gottardo; Adrian E. Raftery; Ka Yee Yeung; Roger E. Bumgarner

2004-01-01

174

EFFECT OF THIDIAZURON ON IN VITRO PROLIFERATION CAPACITIES OF SOME BANANA (Musa spp.) CULTIVARS WITH WEAK MULTIPLICATION POTENTIAL  

Microsoft Academic Search

The multiplication and the distribution of plant material is one of the objectives of plant tissue culture laboratory of African Research Centre on Bananas and Plantains (ARCBAP). Some banana (Musa spp.) cultivars including Topala, Fougamou, Gros-Michel shows low proliferation when cultured in vitro. Other cultivars like Dwarf-Kalapua, Pelipita and Kalapua 2 take long time (two months) to be differentiated in

Emmanuel YOUMBI; Blaise ELLA; Kodjo TOMEKPE

175

Differentiation of Parkinson’s disease and multiple system atrophy in early disease stages by means of I-123-MIBG–SPECT  

Microsoft Academic Search

Background: Differential diagnosis between idiopathic Parkinson’s disease (PD) and multiple system atrophy (MSA) is often difficult in early disease stages. Since MSA is misdiagnosed as PD in more than 20% of the early stages, there is need for methods refining the differentiation of the two disease entities. In PD postganglionic involvement of the autonomic nervous system (ANS) predominates whereas in

A Druschky; M. J Hilz; G Platsch; M Radespiel-Tröger; K Druschky; T Kuwert; B Neundörfer

2000-01-01

176

Childhood multiple sclerosis (MS): multimodal evoked potentials (EP) and magnetic resonance imaging (MRI) comparative study.  

PubMed

We compared the diagnostic sensitivity of magnetic resonance imaging (MRI) and evoked potential (EP) studies in a series of 19 children affected by clinically definite (16 cases) and laboratory supported (3 cases) multiple sclerosis (MS). MRI revealed abnormal areas consistent with demyelinating plaques in 18 out of 19 cases: multiple lesions in 16 and an isolated lesion in 2 cases. Abnormal areas were more frequently found in supratentorial regions than in other areas of the central nervous system. In all patients, the distribution, form and topography of the lesions were typical of MS and similar to those found in the adult form of the disease. Multimodal EP were abnormal in 16 out of 19 cases. Visual (VEP) and somatosensory evoked potentials (SEP) abnormalities were frequently asymptomatic and VEPs were particularly sensitive in ascertaining childhood MS. MRI was slightly more sensitive than multimodal EP in confirming the clinical diagnosis of childhood MS. However, in suspected or probable MS with normal MRI, VEPs and SEPs may contribute to the definition of clinical diagnosis because of their capacity to demonstrate asymptomatic involvement in central nervous system (CNS) the optic nerve and central somatosensory pathways). PMID:2038422

Scaioli, V; Rumi, V; Cimino, C; Angelini, L

1991-02-01

177

Neural differentiation potential of human bone marrow-derived mesenchymal stromal cells: misleading marker gene expression  

PubMed Central

Background In contrast to pluripotent embryonic stem cells, adult stem cells have been considered to be multipotent, being somewhat more restricted in their differentiation capacity and only giving rise to cell types related to their tissue of origin. Several studies, however, have reported that bone marrow-derived mesenchymal stromal cells (MSCs) are capable of transdifferentiating to neural cell types, effectively crossing normal lineage restriction boundaries. Such reports have been based on the detection of neural-related proteins by the differentiated MSCs. In order to assess the potential of human adult MSCs to undergo true differentiation to a neural lineage and to determine the degree of homogeneity between donor samples, we have used RT-PCR and immunocytochemistry to investigate the basal expression of a range of neural related mRNAs and proteins in populations of non-differentiated MSCs obtained from 4 donors. Results The expression analysis revealed that several of the commonly used marker genes from other studies like nestin, Enolase2 and microtubule associated protein 1b (MAP1b) are already expressed by undifferentiated human MSCs. Furthermore, mRNA for some of the neural-related transcription factors, e.g. Engrailed-1 and Nurr1 were also strongly expressed. However, several other neural-related mRNAs (e.g. DRD2, enolase2, NFL and MBP) could be identified, but not in all donor samples. Similarly, synaptic vesicle-related mRNA, STX1A could only be detected in 2 of the 4 undifferentiated donor hMSC samples. More significantly, each donor sample revealed a unique expression pattern, demonstrating a significant variation of marker expression. Conclusion The present study highlights the existence of an inter-donor variability of expression of neural-related markers in human MSC samples that has not previously been described. This donor-related heterogeneity might influence the reproducibility of transdifferentiation protocols as well as contributing to the ongoing controversy about differentiation capacities of MSCs. Therefore, further studies need to consider the differences between donor samples prior to any treatment as well as the possibility of harvesting donor cells that may be inappropriate for transplantation strategies.

Montzka, Katrin; Lassonczyk, Nina; Tschoke, Beate; Neuss, Sabine; Fuhrmann, Tobias; Franzen, Rachelle; Smeets, Ralf; Brook, Gary A; Woltje, Michael

2009-01-01

178

Osmolarity regulates chondrogenic differentiation potential of synovial fluid derived mesenchymal progenitor cells.  

PubMed

Cartilage is one of few tissues where adult stem/progenitor cells have not been putatively identified. Recent studies have provided strong evidence that a sub-population of mesenchymal progenitor cells (MPCs) derived from the synovial fluid may be able to affect some degree of cartilage repair both in vivo and in vitro/ex vivo, however this does not appear to be the case in patients with arthritis. Previously, it has been found that synovial fluid osmolarity is decreased in patients with osteoarthritis (OA) or Rheumatoid arthritis (RA) and these changes in osmolarity have been linked to changes in chondrocyte gene regulation. However, it is yet unknown if changes in osmolarity regulate the gene expression in synovial fluid MPCs (sfMPCs), and by extension, chondrogenesis of this cell population. In the present study we have collected synovial fluid samples from normal, OA and RA knee joints, quantified the osmolarity of the fluid and modified the culture/differentiation media to span a range of osmolarities (264-375 mOsm). Chondrogenesis was measured with Alcian blue staining of cultures in addition to quantitative PCR (qPCR) using probes to Sox9, ACAN and Col2A1. Overall, sfMPCs from arthritic joints demonstrated decreased chondrogenic potential compared to sfMPCs isolated from normal synovial fluid. Furthermore, the sfMPCs retained increased chondrogenic potential if differentiated under the same osmolarity conditions for which they were initially derived within. In conclusion, it does appear the synovial fluid osmolarity regulates the chondrogenic potential of sfMPCs, however, further study is required to elucidate the mechanism by which the changes in osmolarity are sensed by the cells and regulate chondrogenic gene expression. PMID:22579684

Bertram, Karri L; Krawetz, Roman J

2012-06-01

179

Differentiation potential of limbal fibroblasts and bone marrow mesenchymal stem cells to corneal epithelial cells.  

PubMed

The cornea is covered by a stratified epithelium that is renewed by stem cells located in the peripheral region of the cornea known as the limbus. This stroma of the limbus contains stromal keratocytes that, when expanded in culture, are termed limbal fibroblasts (LFs). It is thought that LFs exhibit similar characteristics to bone marrow mesenchymal stem cells (BM MSCs) and help maintain the epithelial stem cell phenotype in the limbal region. In this study, we aimed at reprogramming stage-specific embryonic antigen-4 (SSEA4+) LFs and BM MSCs into corneal epithelial lineage using a three-dimensional culture system and embryonic stem cell medium. After enrichment, SSEA4+ cells showed a higher level of stem cell marker expression such as Sox2, Oct4, Nanog, Rex1, ABCG2, and TRA-1-60, and colony-forming efficiency than did SSEA4- cells. SSEA4+, as compared to SSEA4- cells, had a greater propensity to form spheres that, in turn, were induced into ectodermal lineage and further differentiated into functional corneal epithelium. Results show that LFs were similar to BM MSCs in marker profiles, and together with the differences noted between SSEA4+ and SSEA4- cells, point to LFs' being tissue-specific MSCs. However, LFs showed a greater potential for differentiation into corneal epithelium, indicating the potential importance of tissue-specific adult progenitors in their reprogramming capacity into cells of interest. This study opens a new avenue for investigating the molecular mechanism involved in maintaining a limbal stem cell niche and thus a potentially important clinical application to treat corneal epithelial stem cell loss. PMID:24022965

Katikireddy, Kishore Reddy; Dana, Reza; Jurkunas, Ula V

2014-03-01

180

Singularity analysis of multiple upward continuations to detect edges in potential field data  

NASA Astrophysics Data System (ADS)

In geophysical applications, a number of filters are available to sharpen, de-noise or enhance the data in order to facilitate the interpretation. However, such filters are often implemented in the Fourier domain. Hence, they are not local, acting on all features simultaneously. Detecting strong gradients and edges in potential field data are one of the important tasks to infer geological structures indicating the edges of source bodies. Edges are identified by local singularity analysis combing multiple depth level upward continuations are provided by authors. Sources close to the surface induce short-wavelength anomalies in the signal, whereas sources deep underground induce long-wavelength anomalies in the signal. Upward continuation allows the data to be smooth, attenuates short wavelengths in the signal stronger than long wavelengths so as to highlight deep sources that might be hidden by shallow sources or noise. A useful of local singularity model based on multifractal theory suggested by Qiuming Cheng has gained significant attention in characterizing mineralization and predicting mineral deposits. Especially, this model has had impressive successes in the weak anomaly identification, interpolation for geochemical data. Thus, we create the multiple upward continuation grids of the observed potential field data at various heights. We recommend to add a small value to shift the raw data (>0), and reduce the magnetic data to the pole firstly or even convert it to pseudogravity. Then the singularity indexes are estimated by the multiple heights versus upward continuations under the power law. We take the airborne gravity data and aeromagnetic data in the East Tianshan mountains with desert cover area in Xinjiang province, China as a case study. The singularity spatial distribution for the gravity data in the East Tianshan mountains area indicates the regional deep faults and The singularity spatial distribution for the aeromagnetic data implies the probable host anomaly geobodies of iron-related ore deposits.

Chen, Z.; Cheng, Q.; Lovejoy, S.

2012-12-01

181

Differentiating embryonic stem-derived neural stem cells show a maturation-dependent pattern of voltage-gated sodium current expression and graded action potentials.  

PubMed

A population of mouse embryonic stem (ES)-derived neural stem cells (named NS cells) that exhibits traits reminiscent of radial glia-like cell population and that can be homogeneously expanded in monolayer while remaining stable and highly neurogenic over multiple passages has been recently discovered. This novel population has provided a unique in vitro system in which to investigate physiological events occurring as stem cells lose multipotency and terminally differentiate. Here we analysed the timing, quality and quantity of the appearance of the excitability properties of differentiating NS cells which have been long-term expanded in vitro. To this end, we studied the biophysical properties of voltage-dependent Na(+) currents as an electrophysiological readout for neuronal maturation stages of differentiating NS cells toward the generation of fully functional neurons, since the expression of neuronal voltage-gated Na(+) channels is an essential hallmark of neuronal differentiation and crucial for signal transmission in the nervous system. Using the whole cell and single-channel cell-attached variations of the patch-clamp technique we found that the Na(+) currents in NS cells showed substantial electrophysiological changes during in vitro neuronal differentiation, consisting mainly in an increase of Na(+) current density and in a shift of the steady-state activation and inactivation curves toward more negative and more positive potentials respectively. The changes in the Na(+) channel system were closely related with the ability of differentiating NS cells to generate action potentials, and could therefore be exploited as an appropriate electrophysiological marker of ES-derived NS cells undergoing functional neuronal maturation. PMID:17870247

Biella, G; Di Febo, F; Goffredo, D; Moiana, A; Taglietti, V; Conti, L; Cattaneo, E; Toselli, M

2007-10-12

182

The Multiple Menu Model for Developing Differentiated Curriculum for the Gifted and Talented  

Microsoft Academic Search

The history of curriculum development for the gifted has witnessed a seesaw effect rather than an appropriate balance between authentic knowledge (content) and instructional techniques (process). The Multiple Menu Model is a practical set of planning guides that can assist curriculum developers in combining content with instructional strategies. Menus are provided in the areas of Knowledge, Instructional Objectives and Student

Joseph S. Renzulli

1988-01-01

183

The Differentiated Additive Androgyny Model: Relations between Masculinity, Femininity and Multiple Dimensions of Self-Concept.  

ERIC Educational Resources Information Center

Masculinity (M) and femininity (F) were related to multiple dimensions of self-concept (SC) for responses to the: Bem Sex Role Inventory and the Self Description Questionnaire III (SDQ-III) by 898 Canadian university students (61% female) in Study 1, and Australian Sex-Role Scale and the SDQ-II by 1,858 Australian high school students (49% female)…

Marsh, Herbert W.; Byrne, Barbara M.

184

Differential reproduction in multiple-queen colonies of the fire ant Solenopsis invicta (Hymenoptera: Formicidae)  

Microsoft Academic Search

The contribution to maternity of workers and female sexuals over time by queens in six multiple-queen laboratory colonies of Solenopsis invicta was directly assessed by use of enzyme genetic markers. Queens contributed more equally to the worker pool than to the pool of sexuals in virtually all samples (Fig. 1), and individuals producing a substantial proportion of the workers often

K. G. Ross

1988-01-01

185

PRECISE FORMATION FLYING CONTROL OF MULTIPLE SPACECRAFT USING CARRIER-PHASE DIFFERENTIAL GPS1  

Microsoft Academic Search

Formation flying is a key technology for deep space and orbital applications that involve multiple spacecraft operations. Imaging and remote sensing systems based on radio interferometry and SAR require very precise (sub- wavelength) aperture knowledge and control for accurate relative data col- lection and processing. Closely tied with the Orion and TechSat21 projects, this work describes the ongoing research to

Gokhan Inalhan; Franz D. Busse

2002-01-01

186

Novel SCRG1/BST1 axis regulates self-renewal, migration, and osteogenic differentiation potential in mesenchymal stem cells  

PubMed Central

Human mesenchymal stem cells (hMSCs) remodel or regenerate various tissues through several mechanisms. Here, we identified the hMSC-secreted protein SCRG1 and its receptor BST1 as a positive regulator of self-renewal, migration, and osteogenic differentiation. SCRG1 and BST1 gene expression decreased during osteogenic differentiation of hMSCs. Intriguingly, SCRG1 maintained stem cell marker expression (Oct-4 and CD271/LNGFR) and the potentials of self-renewal, migration, and osteogenic differentiation, even at high passage numbers. Thus, the novel SCRG1/BST1 axis determines the fate of hMSCs by regulating their kinetic and differentiation potentials. Our findings provide a new perspective on methods for ex vivo expansion of hMSCs that maintain native stem cell potentials for bone-forming cell therapy.

Aomatsu, Emiko; Takahashi, Noriko; Sawada, Shunsuke; Okubo, Naoto; Hasegawa, Tomokazu; Taira, Masayuki; Miura, Hiroyuki; Ishisaki, Akira; Chosa, Naoyuki

2014-01-01

187

Effect of growth differentiation factor 5 on the proliferation and tenogenic differentiation potential of human mesenchymal stem cells in vitro.  

PubMed

The use of growth differentiation factor 5 (GDF-5) in damaged tendons has been shown to improve tendon repair. It has been hypothesized that further improvements may be achieved when GDF-5 is used to promote cell proliferation and induce tenogenic differentiation in human bone marrow-derived mesenchymal stem cells (hMSCs). However, the optimal conditions required to produce these effects on hMSCs have not been demonstrated in previous studies. A study to determine cell proliferation and tenogenic differentiation in hMSCs exposed to different concentrations of GDF-5 (0, 5, 25, 50, 100 and 500 ng/ml) was thus conducted. No significant changes were observed in the cell proliferation rate in hMSCs treated at different concentrations of GDF-5. GDF-5 appeared to induce tenogenic differentiation at 100 ng/ml, as reflected by (1) a significant increase in total collagen expression, similar to that of the primary native human tenocyte culture; (2) a significant upregulation in candidate tenogenic marker gene expression, i.e. scleraxis, tenascin-C and type-I collagen; (3) the ratio of type-I collagen to type-III collagen expression was elevated to levels similar to that of human tenocyte cultures, and (4) a significant downregulation of the non-tenogenic marker genes runt-related transcription factor 2 and sex determining region Y (SRY)-box 9 at day 7 of GDF-5 induction, further excluding hMSC differentiation into other lineages. In conclusion, GDF-5 does not alter the proliferation rates of hMSCs, but, instead, induces an optimal tenogenic differentiation response at 100 ng/ml. PMID:22653337

Tan, Sik-Loo; Ahmad, Raja Elina; Ahmad, Tunku Sara; Merican, Azhar M; Abbas, Azlina A; Ng, Wuey Min; Kamarul, Tunku

2012-01-01

188

Identification of Aquifer Transmissivity with Multiple Sets of Data Using the Differential System Method  

Microsoft Academic Search

The mass balance equation for stationary flow in a confined aquifer and the phenomenological Darcy’s law lead to a classical\\u000a elliptic PDE, whose phenomenological coefficient is transmissivity, T, whereas the unknown function is the piezometric head. The differential system method (DSM) allows the computation of T when two “independent” data sets are available, i.e., a couple of piezometric heads and

M. Giudici; G. A. Meles; G. Parravicini; G. Ponzini; C. Vassena

2006-01-01

189

Unwrapping differential x-ray phase-contrast images through phase estimation from multiple energy data.  

PubMed

We present a spectral phase unwrapping approach for grating-based differential phase-contrast data where the unwrapped interferometer phase shift is estimated from energy discriminated measurements using maximum likelihood principles. We demonstrate the method on tomographic data sets of a test specimen taken at different x-ray energies using synchrotron radiation. The proposed unwrapping technique was demonstrated to successfully correct the data set for phase wrapping. PMID:24514461

Epple, F M; Potdevin, G; Thibault, P; Ehn, S; Herzen, J; Hipp, A; Beckmann, F; Pfeiffer, F

2013-12-01

190

PPARgamma2 nuclear receptor controls multiple regulatory pathways of osteoblast differentiation from marrow mesenchymal stem cells  

Microsoft Academic Search

Rosiglitazone (Rosi), a member of the thiazolidinedione class of drugs used to treat type 2 diabetes, activates the adipocyte-specific transcription factor peroxisome proliferator-activated receptor gamma (PPARgamma). This activation causes bone loss in animals and humans, at least in part due to suppression of osteoblast differentiation from marrow mesenchymal stem cells (MSC). In order to identify mechanisms by which PPARgamma2 suppresses

Keith R. Shockley; Oxana P. Lazarenko; Piotr J. Czernik; Clifford J. Rosen; Gary A. Churchill; Czernik B Lecka

2009-01-01

191

Differential Proteomics Reveals Multiple Components in Retrogradely Transported Axoplasm After Nerve Injury  

Microsoft Academic Search

Information on axonal damage is conveyed to neuronal cell bodies by a number of signaling modalities, including the post-translational modification of axoplasmic pro- teins. Retrograde transport of a subset of such proteins is thought to induce or enhance a regenerative response in the cell body. Here we report the use of a differential 2D-PAGE approach to identify injury-correlated retro- gradely

Eran Perlson; Katalin F. Medzihradszky; Zsuzsanna Darula; David W. Munno; Naweed I. Syed; Alma L. Burlingame; Mike Fainzilber

2004-01-01

192

Integrating prior knowledge in multiple testing under dependence with applications to detecting differential DNA methylation.  

PubMed

DNA methylation has emerged as an important hallmark of epigenetics. Numerous platforms including tiling arrays and next generation sequencing, and experimental protocols are available for profiling DNA methylation. Similar to other tiling array data, DNA methylation data shares the characteristics of inherent correlation structure among nearby probes. However, unlike gene expression or protein DNA binding data, the varying CpG density which gives rise to CpG island, shore and shelf definition provides exogenous information in detecting differential methylation. This article aims to introduce a robust testing and probe ranking procedure based on a nonhomogeneous hidden Markov model that incorporates the above-mentioned features for detecting differential methylation. We revisit the seminal work of Sun and Cai (2009, Journal of the Royal Statistical Society: Series B (Statistical Methodology)71, 393-424) and propose modeling the nonnull using a nonparametric symmetric distribution in two-sided hypothesis testing. We show that this model improves probe ranking and is robust to model misspecification based on extensive simulation studies. We further illustrate that our proposed framework achieves good operating characteristics as compared to commonly used methods in real DNA methylation data that aims to detect differential methylation sites. PMID:22260651

Kuan, Pei Fen; Chiang, Derek Y

2012-09-01

193

Differential expression of galectin-1 and galectin-3 in thyroid tumors. Potential diagnostic implications.  

PubMed Central

Carcinoma of the thyroid gland, the most frequently diagnosed endocrine malignancy, is often associated with early regional metastases. With the exception of papillary carcinoma, distinguishing benign from malignant thyroid neoplasms in the absence of metastatic disease is difficult. Recently, the vertebrate lectins galectin-1 and galectin-3 have been implicated in the regulation of cellular growth, differentiation, and malignant transformation of a variety of tissues. To determine whether these galectins have a role in thyroid neoplasia, we analyzed 32 specimens from thyroid malignancies (16 papillary, 7 follicular, 8 medullary carcinomas, and 1 metastasis to lymph node), 10 benign thyroid adenomas, 1 nodular goiter, and 33 specimens from adjacent normal thyroid tissue for the expression of galectin-1 and galectin-3 with immunohistochemical and immunoblotting techniques utilizing anti-galectin antibodies. All thyroid malignancies of epithelial origin (ie, papillary and follicular carcinomas) and a metastatic lymph node from a papillary carcinoma expressed high levels of both galectin-1 and galectin-3. The medullary thyroid carcinomas, which are of parafollicular C cell origin, showed a weaker and variable expression of these galectins. In contrast, neither benign thyroid adenomas nor adjacent normal thyroid tissue expressed galectin-1 or galectin-3. These results suggest that galectin-1 and galectin-3 may be associated with malignant transformation of thyroid epithelium and may potentially serve as markers for distinguishing benign thyroid adenomas from differentiated thyroid carcinomas. Images Figure 1 Figure 2 Figure 3 Figure 4

Xu, X. C.; el-Naggar, A. K.; Lotan, R.

1995-01-01

194

Derivation and characterization of human embryonic germ cells: serum-free culture and differentiation potential.  

PubMed

This study examined the effects of a chemically defined culture medium supplement, knock-out serum replacement (KSR), on the growth and differentiation of human embryonic germ cells (hEgc) and found that the efficiency of the initial establishment of hEGC lines in KSR medium was significantly higher than in fetal calf serum (FCS) medium. The percentage of undifferentiated hEGC colonies growing in KSR medium was significantly higher than in FCS-based medium (P < 0.05). The hEGC colonies showed typical mouse embryonic germ cell-like morphology. They showed normal and stable diploid karyotype and expressed alkaline phosphatase (AP), stage-specific embryonic antigens (SSEA) and other specific markers of pluripotent cells. In addition, hEGC could form simple and cystic embryoid bodies (EB) that consisted of various cell types including neural, epithelial and rhythmically beating cardiac cells, even sperm-like and oocyte-like cells. Tumour-like outgrowths were formed in nude mice and found to contain a variety of cell types, including uterine epithelium, adipocytes, squamous tissue and skin structures. In conclusion, an appropriate serum-free culture system has been developed for the establishment of hEGC lines. This may provide an in-vitro model to study differentiation and can be used as a potential source of therapy for infertility and regenerative medicine. PMID:19712561

Hua, Jinlian; Yu, Haisheng; Liu, Sheng; Dou, Zhongying; Sun, Yadong; Jing, Xiaoqi; Yang, Chunrong; Lei, Anmin; Wang, Huayan; Gao, Zhimin

2009-08-01

195

Precision Differential Photometry from a Non-Precision Site (Expanding Undergraduate Research Potential)  

NASA Astrophysics Data System (ADS)

More than a decade ago the first exo-planet transit light curve was observed with modest instruments. This inspired the idea that it might be possible to develop observational and data reduction techniques using our venerable, but ancient 16” Boller & Chivens telescope to achieve the milli-magnitude precision differential photometry necessary for such a project. Such capability with a small instrument in the very “non-photometric” environment of our region (SE USA) greatly expands the potential observational projects available to undergraduate (and faculty) researchers. A brief description of the techniques developed to achieve this capability at the University of North Georgia will be presented. The state of our telescope is such that if these techniques work for us, they should be more than applicable to other researchers at institutions in similar regions with similar sized but more modern instruments.

Jones, Joseph H.

2013-06-01

196

F-18 fluorodeoxyglucose: Its potential in differentiating between stress fracture and neoplasia  

SciTech Connect

F-18 fluorodeoxyglucose (FDG) accumulates into regions of enhanced glucose uptake and metabolism such as the brain, heart, and malignant tumors. The clinical usefulness of this positron-emitting radiopharmaceutical is illustrated in a case where the clinical picture and CT indicated a malignant bone lesion in the clavicle. Histologically a stress fracture was found secondary to chronic strain on the clavicle. On follow-up the lesion's course was benign. Planar imaging with F-18 FDG was performed twice during follow-up, and on both occasions there was no accumulation of radioactivity over the suspicious area, indicating normal glucose consumption. This case demonstrates the differential diagnostic potential of F-18 FDG and shows that clinically useful information may be obtained without a position emission tomograph.

Paul, R.; Ahonen, A.; Virtama, P.; Aho, A.; Ekfors, T. (University Central Hospital, Turku (Finland))

1989-12-01

197

Identification of circulating microRNAs for the differential diagnosis of Parkinson's disease and Multiple System Atrophy  

PubMed Central

Background: Parkinson's disease (PD) is a progressive neurodegenerative disorder which may be misdiagnosed with atypical conditions such as Multiple System Atrophy (MSA), due to overlapping clinical features. MicroRNAs (miRNAs) are small non-coding RNAs with a key role in post-transcriptional gene regulation. We hypothesized that identification of a distinct set of circulating miRNAs (cmiRNAs) could distinguish patients affected by PD from MSA and healthy individuals. Results. Using TaqMan Low Density Array technology, we analyzed 754 miRNAs and found 9 cmiRNAs differentially expressed in PD and MSA patients compared to healthy controls. We also validated a set of 4 differentially expressed cmiRNAs in PD and MSA patients vs. controls. More specifically, miR-339-5p was downregulated, whereas miR-223*, miR-324-3p, and mir-24 were upregulated in both diseases. We found cmiRNAs specifically deregulated in PD (downregulation of miR-30c and miR-148b) and in MSA (upregulation of miR-148b). Finally, comparing MSA and PD, we identified 3 upregulated cmiRNAs in MSA serum (miR-24, miR-34b, miR-148b). Conclusions. Our results suggest that cmiRNA signatures discriminate PD from MSA patients and healthy controls and may be considered specific, non-invasive biomarkers for differential diagnosis.

Vallelunga, Annamaria; Ragusa, Marco; Di Mauro, Stefania; Iannitti, Tommaso; Pilleri, Manuela; Biundo, Roberta; Weis, Luca; Di Pietro, Cinzia; De Iuliis, Angela; Nicoletti, Alessandra; Zappia, Mario; Purrello, Michele; Antonini, Angelo

2014-01-01

198

Multiple and differentiated contributions to the male gene pool of pastoral and farmer populations of the African Sahel.  

PubMed

The African Sahel is conducive to studies of divergence/admixture genetic events as a result of its population history being so closely related with past climatic changes. Today, it is a place of the co-existence of two differing food-producing subsistence systems, i.e., that of sedentary farmers and nomadic pastoralists, whose populations have likely been formed from several dispersed indigenous hunter-gatherer groups. Using new methodology, we show here that the male gene pool of the extant populations of the African Sahel harbors signatures of multiple and differentiated contributions from different genetic sources. We also show that even if the Fulani pastoralists and their neighboring farmers share high frequencies of four Y chromosome subhaplogroups of E, they have drawn on molecularly differentiated subgroups at different times. These findings, based on combinations of SNP and STR polymorphisms, add to our previous knowledge and highlight the role of differences in the demographic history and displacements of the Sahelian populations as a major factor in the segregation of the Y chromosome lineages in Africa. Interestingly, within the Fulani pastoralist population as a whole, a differentiation of the groups from Niger is characterized by their high presence of R1b-M343 and E1b1b1-M35. Moreover, the R1b-M343 is represented in our dataset exclusively in the Fulani group and our analyses infer a north-to-south African migration route during a recent past. PMID:23460272

Bu?ková, Jana; Cerný, Viktor; Novelletto, Andrea

2013-05-01

199

Identification of potential biomarkers from microarray experiments using multiple criteria optimization  

PubMed Central

Microarray experiments are capable of determining the relative expression of tens of thousands of genes simultaneously, thus resulting in very large databases. The analysis of these databases and the extraction of biologically relevant knowledge from them are challenging tasks. The identification of potential cancer biomarker genes is one of the most important aims for microarray analysis and, as such, has been widely targeted in the literature. However, identifying a set of these genes consistently across different experiments, researches, microarray platforms, or cancer types is still an elusive endeavor. Besides the inherent difficulty of the large and nonconstant variability in these experiments and the incommensurability between different microarray technologies, there is the issue of the users having to adjust a series of parameters that significantly affect the outcome of the analyses and that do not have a biological or medical meaning. In this study, the identification of potential cancer biomarkers from microarray data is casted as a multiple criteria optimization (MCO) problem. The efficient solutions to this problem, found here through data envelopment analysis (DEA), are associated to genes that are proposed as potential cancer biomarkers. The method does not require any parameter adjustment by the user, and thus fosters repeatability. The approach also allows the analysis of different microarray experiments, microarray platforms, and cancer types simultaneously. The results include the analysis of three publicly available microarray databases related to cervix cancer. This study points to the feasibility of modeling the selection of potential cancer biomarkers from microarray data as an MCO problem and solve it using DEA. Using MCO entails a new optic to the identification of potential cancer biomarkers as it does not require the definition of a threshold value to establish significance for a particular gene and the selection of a normalization procedure to compare different experiments is no longer necessary.

Sanchez-Pena, Matilde L; Isaza, Clara E; Perez-Morales, Jaileene; Rodriguez-Padilla, Cristina; Castro, Jose M; Cabrera-Rios, Mauricio

2013-01-01

200

Differentially Expressed Plasma MicroRNAs and the Potential Regulatory Function of Let-7b in Chronic Thromboembolic Pulmonary Hypertension  

PubMed Central

Chronic thromboembolic pulmonary hypertension (CTEPH) is a progressive disease characterized by misguided thrombolysis and remodeling of pulmonary arteries. MicroRNAs are small non-coding RNAs involved in multiple cell processes and functions. During CTEPH, circulating microRNA profile endued with characteristics of diseased cells could be identified as a biomarker, and might help in recognition of pathogenesis. Thus, in this study, we compared the differentially expressed microRNAs in plasma of CTEPH patients and healthy controls and investigated their potential functions. Microarray was used to identify microRNA expression profile and qRT-PCR for validation. The targets of differentially expressed microRNAs were identified in silico, and the Gene Ontology database and Kyoto Encyclopedia of Genes and Genomes pathway database were used for functional investigation of target gene profile. Targets of let-7b were validated by fluorescence reporter assay. Protein expression of target genes was determined by ELISA or western blotting. Cell migration was evaluated by wound healing assay. The results showed that 1) thirty five microRNAs were differentially expressed in CTEPH patients, among which, a signature of 17 microRNAs, which was shown to be related to the disease pathogenesis by in silico analysis, gave diagnostic efficacy of both sensitivity and specificity >0.9. 2) Let-7b, one of the down-regulated anti-oncogenic microRNAs in the signature, was validated to decrease to about 0.25 fold in CTEPH patients. 3) ET-1 and TGFBR1 were direct targets of let-7b. Altering let-7b level influenced ET-1 and TGFBR1 expression in pulmonary arterial endothelial cells (PAECs) as well as the migration of PAECs and pulmonary arterial smooth muscle cells (PASMCs). These results suggested that CTEPH patients had aberrant microRNA signature which might provide some clue for pathogenesis study and biomarker screening. Reduced let-7b might be involved in the pathogenesis of CTEPH by affecting ET-1 expression and the function of PAECs and PASMCs.

Guo, Lijuan; Yang, Yuanhua; Liu, Jie; Wang, Lei; Li, Jifeng; Wang, Ying; Liu, Yan; Gu, Song; Gan, Huili; Cai, Jun; Yuan, Jason X.-J.; Wang, Jun; Wang, Chen

2014-01-01

201

Reconstruction of multiple gastric electrical wave fronts using potential based inverse methods  

PubMed Central

One approach, commonly used in the field of electrocardiography, involves solving an inverse problem whereby electrical potentials on the stomach surface are directly reconstructed from dense potential measurements on the skin surface. To investigate this problem, an anatomically realistic torso model and an electrical stomach model were used to simulate potentials on stomach and skin surfaces arising from normal gastric electrical activity. The effectiveness of the Greensite-Tikhonov or the Tikhonov inverse methods were compared under the presence of 10% Gaussian noise with either 84 or 204 body surface electrodes. The stability and accuracy of the Greensite-Tikhonov method was further investigated by introducing varying levels of Gaussian signal noise or by increasing or decreasing the size of the stomach by 10%. Results showed that the reconstructed solutions were able to represent the presence of propagating multiple wave fronts and the Greensite-Tikhonov method with 204 electrodes performed best (Correlation coefficients of activation time: 90%; Pacemaker localization error: 3 cm). The Greensite-Tikhonov method was stable with Gaussian noise levels up to 20% and 10% change in stomach size. The use of 204 rather than 84 body surface electrodes improved the performance; however, for all investigated cases, the Greensite-Tikhonov method outperformed the Tikhonov method.

Kim, J HK; Pullan, A J; Cheng, L K

2012-01-01

202

Reconstruction of multiple gastric electrical wave fronts using potential-based inverse methods  

NASA Astrophysics Data System (ADS)

One approach for non-invasively characterizing gastric electrical activity, commonly used in the field of electrocardiography, involves solving an inverse problem whereby electrical potentials on the stomach surface are directly reconstructed from dense potential measurements on the skin surface. To investigate this problem, an anatomically realistic torso model and an electrical stomach model were used to simulate potentials on stomach and skin surfaces arising from normal gastric electrical activity. The effectiveness of the Greensite-Tikhonov or the Tikhonov inverse methods were compared under the presence of 10% Gaussian noise with either 84 or 204 body surface electrodes. The stability and accuracy of the Greensite-Tikhonov method were further investigated by introducing varying levels of Gaussian signal noise or by increasing or decreasing the size of the stomach by 10%. Results showed that the reconstructed solutions were able to represent the presence of propagating multiple wave fronts and the Greensite-Tikhonov method with 204 electrodes performed best (correlation coefficients of activation time: 90%; pacemaker localization error: 3 cm). The Greensite-Tikhonov method was stable with Gaussian noise levels up to 20% and 10% change in stomach size. The use of 204 rather than 84 body surface electrodes improved the performance; however, for all investigated cases, the Greensite-Tikhonov method outperformed the Tikhonov method.

Kim, J. H. K.; Pullan, A. J.; Cheng, L. K.

2012-08-01

203

Multiple TORC1-Associated Proteins Regulate Nitrogen Starvation-Dependent Cellular Differentiation in Saccharomyces cerevisiae  

PubMed Central

Background The budding yeast Saccharomyces cerevisiae undergoes differentiation into filamentous-like forms and invades the growth medium as a foraging response to nutrient and environmental stresses. These developmental responses are under the downstream control of effectors regulated by the cAMP/PKA and MAPK pathways. However, the upstream sensors and signals that induce filamentous growth through these signaling pathways are not fully understood. Herein, through a biochemical purification of the yeast TORC1 (Target of Rapamycin Complex 1), we identify several proteins implicated in yeast filamentous growth that directly associate with the TORC1 and investigate their roles in nitrogen starvation-dependent or independent differentiation in yeast. Methodology We isolated the endogenous TORC1 by purifying tagged, endogenous Kog1p, and identified associated proteins by mass spectrometry. We established invasive and pseudohyphal growth conditions in two S. cerevisiae genetic backgrounds (?1278b and CEN.PK). Using wild type and mutant strains from these genetic backgrounds, we investigated the roles of TORC1 and associated proteins in nitrogen starvation-dependent diploid pseudohyphal growth as well as nitrogen starvation-independent haploid invasive growth. Conclusions We show that several proteins identified as associated with the TORC1 are important for nitrogen starvation-dependent diploid pseudohyphal growth. In contrast, invasive growth due to other nutritional stresses was generally not affected in mutant strains of these TORC1-associated proteins. Our studies suggest a role for TORC1 in yeast differentiation upon nitrogen starvation. Our studies also suggest the CEN.PK strain background of S. cerevisiae may be particularly useful for investigations of nitrogen starvation-induced diploid pseudohyphal growth.

Laxman, Sunil; Tu, Benjamin P.

2011-01-01

204

Multiple roles of p53-related pathways in somatic cell reprogramming and stem cell differentiation.  

PubMed

The inactivation of p53 functions enhances the efficiency and decreases the latency of producing induced pluripotent stem cells (iPSC) in culture. The formation of iPSCs in culture starts with a rapid set of cell divisions followed by an epigenetic reprogramming of the DNA and chromatin. The mechanisms by which the p53 protein inhibits the formation of iPSCs are largely unknown. Using a temperature sensitive mutant of the p53 (Trp53) gene, we examined the impact of the temporal expression of wild type p53 in preventing stem cell induction from somatic cells. We also explored how different p53 mutant alleles affect the reprogramming process. We found that little or no p53 activity favors the entire process of somatic cell reprogramming. Reactivation of p53 at any time point during the reprogramming process not only interrupted the formation of iPSCs, but also induced newly formed stem cells to differentiate. Among p53-regulated genes, p21 (Cdkn1a), but not Puma (Bbc3) played a partial role in iPSCs formation probably by slowing cell division. Activation of p53 functions in iPSCs induced senescence and differentiation in stem cell populations. High rate of birth defects and increases in DNA methylation at the IGF2-H19 loci in female offspring of p53 knockout mice suggested that the absence of p53 may give rise to epigenetic instability in a stochastic fashion. Consistently, selected p53 missense mutations showed differential effects on the stem cell reprogramming efficiency in a c-Myc dependent manner. The absence of p53 activity and functions also contributed to an enhanced efficiency of iPSC production from cancer cells. The production of iPSCs in culture from normal and cancer cells, although different from each other in several ways, both responded to the inhibition of reprogramming by the p53 protein. PMID:22964580

Yi, Lan; Lu, Chiwei; Hu, Wenwei; Sun, Yvonne; Levine, Arnold J

2012-11-01

205

Preexisting high frequencies of memory CD8+ T cells favors rapid memory differentiation and preservation of proliferative potential upon boosting  

PubMed Central

Summary Memory CD8+ T cell quantity and quality determine protective efficacy against reinfection. Heterologous prime boost vaccination minimizes contraction of anamnestic effectors and maximizes memory CD8+ T cell quantity, but reportedly erodes proliferative potential and protective efficacy. This study exploited heterologous prime boost vaccination to discover parameters regulating effector CD8+ T cell contraction and memory differentiation. When abundant memory T cells were established, boosting induced only 5-8 cell divisions, unusually rapid memory T cell differentiation as measured by phenotype and mitochondrial bioenergetic function, long-lived survival of 50% of effector T cells, and preservation of proliferative potential. Conversely, boosting in situations of low memory CD8+ T cell frequencies induced many cell divisions, increased contraction of effector cells, and caused senescence, low mitochondrial membrane potential, and poorly protective memory. Thus, anamnestic memory T cell differentiation is flexible, and abundant quantity can be achieved while maximizing protective efficacy and preserving proliferative potential.

Fraser, Kathryn A.; Schenkel, Jason M.; Jameson, Stephen C.; Vezys, Vaiva; Masopust, David

2014-01-01

206

Percutaneous method for single-catheter multiple monophasic action potential recordings during magnetocardiographic mapping in spontaneously breathing rodents.  

PubMed

To test the feasibility of a novel method to combine magnetocardiographic (MCG) estimate of ventricular repolarization (VR) and multiple monophasic action potential (MultiMAP) recording in spontaneously breathing rodents with percutaneous sub-xyphoid epicardial placement of a MCG-compatible amagnetic catheter (AC), ten Wistar rats (WRs) and ten guinea pigs (GPs) were studied. Under fluoroscopic control, the AC was moved until four stable MAPs were recorded (fixed inter-electrode distance of 1.2 mm). 36-channel DC-SQUID (sensitivity 20 fT Hz(-½)) were used for MCG mapping. MAPs, differentially amplified (BW: DC-500 Hz), were digitized at 1 kHz. AC pacing provided local ventricular effective refractory period (VERP) estimate. MAP duration (MAPd) was measured at 50% and 90% levels of repolarization. Simultaneous MCG mapping and MultiMAP recording were successful in all animals. Average MAPd50% and MAPd90% were shorter in WRs than in GPs (26.4 ± 2.9 ms versus 110.6 ± 14.3 ms and 60.7 ± 5.4 ms versus 127.7 ± 15.3 ms, respectively). VERP was 51 ± 4.8 ms in WRs and 108.4 ± 12.9 ms in GPs, respectively. The MAP amplitude was 16.9 ± 4.5 in WRs and 16.2 ± 4.2 in GPs. MAP and MCG parameters of VR were in good agreement. All animals survived the procedure. Two also survived a second invasive study; one was followed up until natural death at 52 months. Percutaneous MultiMAP recording is minimally invasive, usually avoids animal sacrifice, is compatible with simultaneous surface MCG mapping and might be used for experimental validation of MCG VR abnormality, to study the arrhythmogenic potential of new drugs and/or animal models of ventricular arrhythmias. PMID:22373565

Brisinda, Donatella; Sorbo, Anna Rita; Venuti, Angela; Fenici, Riccardo

2012-03-01

207

[Ipsilateral masking of auditory evoked potentials: a method of studying multiple sclerosis].  

PubMed

20 normal subjects and 39 patients with multiple sclerosis were the control and the test groups. Auditory brainstem potentials to 60 dB nHL, 11/s clicks, were recorded under ipsilateral broad-band noise masking at S/N ratio of + 60 dB (unmasked condition), + 20 dB, + 10 dB and 0 dB. In the control group the ABP were absent only in 1 subject at S/N = 0 dB. In the group of 16/39 patients with definite multiple sclerosis, 11 had no ABP at S/N = 0 dB, 6 at S/N = + 10 dB and 5 at S/N = + 20 dB. The ABP waveform per se, in the same subjects, was abnormal in 7 and doubtful in 5. These results are discussed in terms of sensitivity, specificity and efficiency of the test to be applied. The best predictive value is achieved by combining a strict morphological criterion with the results of the ipsilateral masking. Moreover, the ipsilateral masking test positive findings are equally distributed in the group of patients with and without signs of neurological involvement of the brainstem. PMID:6534258

Antonelli, A; Collette, J L; Bellotto, R; Felisati, G; Pavani, M; Cesaro, P; Degos, J D; Peynegre, R

1984-01-01

208

Sequential dissection of multiple ionic currents in single cardiac myocytes under action potential-clamp  

PubMed Central

The cardiac action potential (AP) is shaped by myriad ionic currents. In this study we develop an innovative AP-clamp Sequential Dissection technique to enable recording of multiple ionic currents in the single cell under AP-clamp. This new technique presents a significant step beyond the traditional way of recording only one current in any one cell. The ability to measure many currents in a single cell has revealed two hitherto unknown characteristics of the ionic currents in cardiac cells: coordination of currents within a cell and large variation of currents between cells. Hence, the AP-clamp Sequential Dissection method provides a unique and powerful tool for studying individual cell electrophysiology.

Banyasz, Tamas; Horvath, Balazs; Jian, Zhong; Izu, Leighton T.; Chen-Izu, Ye

2011-01-01

209

Therapeutic potential of statins in multiple sclerosis: immune modulation, neuroprotection and neurorepair  

PubMed Central

Statins as inhibitors of 3-hydroxy-3-methyl glutaryl coenzyme A reductase are widely used as cholesterol-lowering drugs. Recent studies provide evidence that the anti-inflammatory activity of statins, which is independent of their cholesterol-lowering effects, may have potential therapeutic implications for neuroinflammatory diseases such as multiple sclerosis (MS), Alzheimer’s disease and brain tumors, as well as traumatic spinal cord and brain injuries. Studies with animal models of MS suggest that, in addition to immunomodulatory activities similar to the ones observed with approved MS medications, statin treatment also protects the BBB, protects against neurodegeneration and may also promote neurorepair. Although the initial human studies on statin treatment for MS are encouraging, prospective randomized clinical studies will be required to evaluate their efficacy in the larger patient population.

Markovic-Plese, Silva; Singh, Avtar K; Singh, Inderjit

2009-01-01

210

MMP-13 loss associated with impaired ECM remodelling disrupts chondrocyte differentiation by concerted effects on multiple regulatory factors  

PubMed Central

Purpose To link MMP-13 activity and ECM remodeling to alterations in regulatory factors leading to a disruption in chondrocyte homeostasis. Methods Matrix-metalloproteinase-13 (MMP-13) expression was ablated in primary human chondrocytes by stable retrotransduction of short-hairpin RNAs. The effects of MMP-13 KD on key regulators of chondrocyte differentiation (Sox9, Runx2 and ?-catenin), and angiogenesis (VEGF) were scored at the protein (immunohistochemistry or western blot) and RNA (real time PCR) levels in high density monolayer and micromass cultures under mineralizing conditions. Effects on cellular viability in conjunction with chondrocyte progression towards a hypertrophic-like state were assessed in micromass cultures. Alterations in Sox9 subcellular distribution were assessed by confocal microscopy in micromass cultures and also in OA cartilage. Results Differentiation of control chondrocyte micromasses progressed up to a terminal phase, with calcium deposition in conjunction with reduced cell viability and scant ECM. MMP-13 knock-down (KD) impaired ECM remodeling and suppressed differentiation in conjunction with reduced levels of Runx2, ?-catenin and VEGF. MMP-13 levels in vitro and ECM remodeling in vitro and in vivo were linked to changes in Sox9 sub-cellular localization. Sox9 was largely excluded from the nuclei of chondrocytes with MMP-13 remodeled or degraded ECM, and exhibited an intranuclear staining pattern in chondrocytes with impaired MMP-13 activity in vitro or with more intact ECM in vivo. Conclusions MMP-13 loss leads to a break-down in primary human articular chondrocyte differentiation by altering the expression of multiple regulatory factors.

Borzi, Rosa Maria; Olivotto, Eleonora; Pagani, Stefania; Vitellozzi, Roberta; Neri, Simona; Battistelli, Michela; Falcieri, Elisabetta; Facchini, Annalisa; Flamigni, Flavio; Penzo, Marianna; Platano, Daniela; Santi, Spartaco; Facchini, Andrea; Marcu, Kenneth B

2010-01-01

211

Multiple pathways are involved in DNA degradation during keratinocyte terminal differentiation.  

PubMed

Loss of the nucleus is a critical step in keratinocyte terminal differentiation. To elucidate the mechanisms involved, we focused on two characteristic events: nuclear translocation of N-terminal fragment of profilaggrin and caspase-14-dependent degradation of the inhibitor of caspase-activated DNase (ICAD). First, we demonstrated that epidermal mesotrypsin liberated a 55-kDa N-terminal fragment of profilaggrin (FLG-N) and FLG-N was translocated into the nucleus. Interestingly, these cells became TUNEL positive. Mutation in the mesotrypsin-susceptible Arg-rich region between FLG-N and the first filaggrin domain abolished these changes. Furthermore, caspase-14 caused limited proteolysis of ICAD, followed by accumulation of caspase-activated DNase (CAD) in TUNEL-positive nuclei. Knockdown of both proteases resulted in a significant increase of remnant nuclei in a skin equivalent model. Immunohistochemical study revealed that both caspase-14 and mesotrypsin were markedly downregulated in parakeratotic areas of lesional skin from patients with atopic dermatitis and psoriasis. Collectively, our results indicate that at least two pathways are involved in the DNA degradation process during keratinocyte terminal differentiation. PMID:24743736

Yamamoto-Tanaka, M; Makino, T; Motoyama, A; Miyai, M; Tsuboi, R; Hibino, T

2014-01-01

212

Differential gene expression profiles of scirrhous gastric cancer cells with high metastatic potential to peritoneum or lymph nodes.  

PubMed

Scirrhous gastric cancer is often accompanied by metastasis to the peritoneum and/or lymph nodes, resulting in the highest mortality rate among gastric cancers. Mechanisms involved in gastric cancer metastasis are not fully clarified because metastasis involves multiple steps and requires the accumulation of altered expression of many different genes. Thus, independent analysis of any single gene would be insufficient to understand all of the aspects of gastric cancer metastasis. In this study, we performed global analysis on differential gene expression of a scirrhous gastric cancer cell line (OCUM-2M) and its derivative sublines with high potential for metastasis to the peritoneal cavity (OCUM-2MD3) and lymph nodes (OCUM-2MLN) in a nude mice model. By applying a high-density oligonucleotide array method, expression of approximately 6800 genes was analyzed, and selected genes were confirmed by the Northern blot method. In our observations in OCUM-2MD3 cells, 12 genes were up-regulated, and 20 genes were down-regulated. In OCUM-2MLN cells, five genes were up-regulated, and five genes were down-regulated. The analysis revealed two functional gene clusters with altered expression: (a) down-regulation of a cluster of squamous cell differentiation marker genes such as small proline-rich proteins [SPRRs (SPRR1A, SPRR1B, and SPRR2A], annexin A1, epithelial membrane protein 1, cellular retinoic acid-binding protein 2, and mesothelin in OCUM-2MD3 cells; and (b) up-regulation of a cluster of antigen-presenting genes such as MHC class II (DP, DR, and DM) and invariant chain (II) in OCUM-2MLN cells through up-regulation of CIITA (MHC class II transactivator). We then analyzed six gastric cancer cell lines by Northern blot and observed preferential up-regulation of trefoil factor 1, alpha-1-antitrypsin, and galectin 4 and down-regulation of cytidine deaminase in cells prone to peritoneal dissemination. Genes highly correlated with invasion or peritoneal dissemination of gastric cancer, such as E-cadherin or integrin beta4, were down-regulated in both of the derivative cell lines analyzed in this study. This is the first demonstration of global gene expression analysis of gastric cancer cells with different metastatic potentials, and these results provide a new insight in the study of human gastric cancer metastasis. PMID:11221876

Hippo, Y; Yashiro, M; Ishii, M; Taniguchi, H; Tsutsumi, S; Hirakawa, K; Kodama, T; Aburatani, H

2001-02-01

213

miR-29b negatively regulates human osteoclastic cell differentiation and function: implications for the treatment of multiple myeloma-related bone disease.  

PubMed

Skeletal homeostasis relies upon a fine tuning of osteoclast (OCL)-mediated bone resorption and osteoblast (OBL)-dependent bone formation. This balance is unsettled by multiple myeloma (MM) cells, which impair OBL function and stimulate OCLs to generate lytic lesions. Emerging experimental evidence is disclosing a key regulatory role of microRNAs (miRNAs) in the regulation of bone homeostasis suggesting the miRNA network as potential novel target for the treatment of MM-related bone disease (BD). Here, we report that miR-29b expression decreases progressively during human OCL differentiation in vitro. We found that lentiviral transduction of miR-29b into OCLs, even in the presence of MM cells, significantly impairs tartrate acid phosphatase (TRAcP) expression, lacunae generation, and collagen degradation, which are relevant hallmarks of OCL activity. Accordingly, expression of cathepsin K and metalloproteinase 9 (MMP9) as well as actin ring rearrangement were impaired in the presence of miR-29b. Moreover, we found that canonical targets C-FOS and metalloproteinase 2 are suppressed by constitutive miR-29b expression which also downregulated the master OCL transcription factor, NAFTc-1. Overall, these data indicate that enforced expression of miR-29b impairs OCL differentiation and overcomes OCL activation triggered by MM cells, providing a rationale for miR-29b-based treatment of MM-related BD. PMID:23254643

Rossi, Marco; Pitari, Maria Rita; Amodio, Nicola; Di Martino, Maria Teresa; Conforti, Francesco; Leone, Emanuela; Botta, Cirino; Paolino, Francesco Maria; Del Giudice, Teresa; Iuliano, Eleonora; Caraglia, Michele; Ferrarini, Manlio; Giordano, Antonio; Tagliaferri, Pierosandro; Tassone, Pierfrancesco

2013-07-01

214

Differential in vivo and in vitro HLA-G expression in melanoma cells: potential mechanisms.  

PubMed

The potential role of human leukocyte antigen G (HLA-G) in tumor immune escape has stimulated interest in the analysis of the expression of this molecule in malignant cells. In melanoma approximately 30% and less than 1% of surgically-removed lesions and cultured cell lines, respectively, have been found to express HLA-G protein. The reason for the marked difference in HLA-G expression frequency is unknown. Here we discuss the potential role of HLA-G detection methodology, stress factors in the tumor microenvironment, and epigenetic changes during tumor progression in the differential in vivo and in vitro HLA-G expression in melanoma cells. We propose a model that may account for the preferential in vivo HLA-G expression in melanoma cells. If proven correct, this model represents a useful background to investigate the mechanisms regulating HLA-G expression in melanoma cells and to devise strategies to counteract HLA-G expression in patients with melanoma. PMID:14602236

Chang, Chien-Chung; Murphy, Shawn P; Ferrone, Soldano

2003-11-01

215

Differential impact of attention on the early and late categorization related human brain potentials.  

PubMed

Previous human studies have shown that object-selective attention enhances neural activities evoked in response to target stimuli. However, it is not clear whether the magnitude of activity enhancement is constant or varies according to the level of stimulus visibility. To examine the effect of attentional modulation on different event-related potentials (ERPs) and the relationship between attentional modulation and level of stimulus visibility, subjects were instructed to perform face detection and leaf detection tasks in separate blocks while the level of stimulus visibility varied randomly from trial to trial. As a result of object-selective attention, N170 and P400 ERP components were both modulated in response to the task target category compared to when the same category was used as distracter. We found that the magnitude of modulation of the N170 component was independent of the stimulus visibility level, while the P400 ERP component showed increased enhancement as the level of stimulus visibility increased. These findings demonstrate that attention impacts the neural populations, indexed by early (N170) and late (P400) evoked potentials, differentially and that attentional modulation becomes increasingly dependent on the level of stimulus visibility through the course of brain activities. PMID:20884513

Nasr, Shahin

2010-01-01

216

Multiple Hypovascular Tumors in Kidney: A Rare Case Report and Differential Diagnosis  

PubMed Central

The most common malignant renal tumor is renal cell carcinoma and surgery is the standard treatment. The proportion of lymphoma with renal involvement is 2~15% and lymphoma could be cured by chemotherapy without nephrectomy. Sonography, computed tomography (CT), and magnetic resonance imaging (MRI) can detect and characterize a renal mass. We present a case of right renal hypovascular tumors and differential diagnosis of hypovascular tumors by image study. CT scan showed hypovascular tumors and MRI image revealed multifocal hypovascular solid tumors with significantly increased apparent diffusion coefficient (ADC) of diffusion weighted imaging (DWI). Based on image finding, renal lymphoma was highly suspected. Renal lymphoma was confirmed by renal biopsy and this patient received chemotherapy without surgery. The noninvasive CT scan and MRI image can help clinicians to diagnose the characteristics of renal mass and to avoid unnecessary nephrectomy.

Wu, Pei-Yu; Lin, Sheng-Fung; Wu, Ping-Hsun; Tsai, Yi-Chun; Kuo, Yu-Ting; Kuo, Mei-Chuan; Chen, Hung-Chun

2013-01-01

217

[White matter lesions, young age, female--differential diagnosis of multiple sclerosis and juvenile stroke].  

PubMed

Fabry's disease is an X-chromosomal linked recessive lysosomal storage disease caused by a deficiency of ?-galactosidase A. Accumulation of toxic levels of sphingolipids leads to metabolic dysfunction in various cell types (endothelial cells, myocytes, fibroblasts) and organs thus causing a variety of symptoms. Neurological manifestations include recurrent strokes and polyneuropathy, many patients complain of pain or vertigo. The presentation of these polymorphic symptoms mostly at young age often leads to incorrect diagnosis and mistreatment. Here we report two cases of female patients who both were misdiagnosed and thus mistreated for many years. These case-reports aim in increasing the awareness for Fabry's disease as a differential diagnosis, especially in young women presenting with white matter lesions. PMID:23516103

Flossdorf, P; Kurschat, C; Fink, G R; Sparing, R

2013-03-01

218

PPAR?2 NUCLEAR RECEPTOR CONTROLS MULTIPLE REGULATORY PATHWAYS OF OSTEOBLAST DIFFERENTIATION FROM MARROW MESENCHYMAL STEM CELLS  

PubMed Central

Rosiglitazone (Rosi), a member of the thiazolidinedione class of drugs used to treat type 2 diabetes, activates the adipocyte-specific transcription factor peroxisome proliferator-activated receptor gamma (PPAR?). This activation causes bone loss in animals and humans, at least in part due to suppression of osteoblast differentiation from marrow mesenchymal stem cells (MSC). In order to identify mechanisms by which PPAR?2 suppresses osteoblastogenesis and promotes adipogenesis in MSC, we have analyzed the PPAR?2 transcriptome in response to Rosi. A total of 4,252 transcriptional changes resulted when Rosi (1 ?M) was applied to the U-33 marrow stromal cell line stably transfected with PPAR?2 (U-33/?2) as compared to non-induced U-33/?2 cells. Differences between U-33/?2 and U-33 cells stably transfected with empty vector (U-33/c) comprised 7,928 transcriptional changes, independent of Rosi. Cell type-, time- and treatment-specific gene clustering uncovered distinct patterns of PPAR?2 transcriptional control of MSC lineage commitment. The earliest changes accompanying Rosi activation of PPAR?2 included effects on Wnt, TGF?/BMP and G-protein signaling activities, as well as sustained induction of adipocyte-specific gene expression and lipid metabolism. While suppression of osteoblast phenotype is initiated by a diminished expression of osteoblast-specific signaling pathways, induction of the adipocyte phenotype is initiated by adipocyte-specific transcriptional regulators. This indicates that distinct mechanisms govern the repression of osteogenesis and the stimulation of adipogenesis. The co-expression patterns found here indicate that PPAR?2 has a dominant role in controlling osteoblast differentiation and suggests numerous gene-gene interactions that could lead to the identification of a “master” regulatory scheme directing this process.

Shockley, Keith R.; Lazarenko, Oxana P.; Czernik, Piotr J.; Rosen, Clifford J.; Churchill, Gary A.; Lecka-Czernik, Beata

2009-01-01

219

Medicago truncatula symbiotic peptide NCR247 contributes to bacteroid differentiation through multiple mechanisms  

PubMed Central

Symbiosis between rhizobia soil bacteria and legume plants results in the formation of root nodules where plant cells are fully packed with nitrogen fixing bacteria. In the host cells, the bacteria adapt to the intracellular environment and gain the ability for nitrogen fixation. Depending on the host plants, the symbiotic fate of bacteria can be either reversible or irreversible. In Medicago and related legume species, the bacteria undergo a host-directed multistep differentiation process culminating in the formation of elongated and branched polyploid bacteria with definitive loss of cell division ability. The plant factors are nodule-specific symbiotic peptides. Approximately 600 of them are nodule-specific cysteine-rich (NCR) peptides produced in the rhizobium-infected plant cells. NCRs are targeted to the endosymbionts, and concerted action of different sets of peptides governs different stages of endosymbiont maturation, whereas the symbiotic function of individual NCRs is unknown. This study focused on NCR247, a cationic peptide exhibiting in vitro antimicrobial activities. We show that NCR247 acts in those nodule cells where bacterial cell division is arrested and cell elongation begins. NCR247 penetrates the bacteria and forms complexes with many bacterial proteins. Interaction with FtsZ required for septum formation is one of the host interventions for inhibiting bacterial cell division. Complex formation with the ribosomal proteins affects translation and contributes to altered proteome and physiology of the endosymbiont. Binding to the chaperone GroEL amplifies the NCR247-modulated biological processes. We show that GroEL1 of Sinorhizobium meliloti is required for efficient infection, terminal differentiation, and nitrogen fixation.

Farkas, Attila; Maroti, Gergely; Durgo, Hajnalka; Gyorgypal, Zoltan; Lima, Rui M.; Medzihradszky, Katalin F.; Kereszt, Attila; Mergaert, Peter; Kondorosi, Eva

2014-01-01

220

Medicago truncatula symbiotic peptide NCR247 contributes to bacteroid differentiation through multiple mechanisms.  

PubMed

Symbiosis between rhizobia soil bacteria and legume plants results in the formation of root nodules where plant cells are fully packed with nitrogen fixing bacteria. In the host cells, the bacteria adapt to the intracellular environment and gain the ability for nitrogen fixation. Depending on the host plants, the symbiotic fate of bacteria can be either reversible or irreversible. In Medicago and related legume species, the bacteria undergo a host-directed multistep differentiation process culminating in the formation of elongated and branched polyploid bacteria with definitive loss of cell division ability. The plant factors are nodule-specific symbiotic peptides. Approximately 600 of them are nodule-specific cysteine-rich (NCR) peptides produced in the rhizobium-infected plant cells. NCRs are targeted to the endosymbionts, and concerted action of different sets of peptides governs different stages of endosymbiont maturation, whereas the symbiotic function of individual NCRs is unknown. This study focused on NCR247, a cationic peptide exhibiting in vitro antimicrobial activities. We show that NCR247 acts in those nodule cells where bacterial cell division is arrested and cell elongation begins. NCR247 penetrates the bacteria and forms complexes with many bacterial proteins. Interaction with FtsZ required for septum formation is one of the host interventions for inhibiting bacterial cell division. Complex formation with the ribosomal proteins affects translation and contributes to altered proteome and physiology of the endosymbiont. Binding to the chaperone GroEL amplifies the NCR247-modulated biological processes. We show that GroEL1 of Sinorhizobium meliloti is required for efficient infection, terminal differentiation, and nitrogen fixation. PMID:24706863

Farkas, Attila; Maróti, Gergely; Durg?, Hajnalka; Györgypál, Zoltán; Lima, Rui M; Medzihradszky, Katalin F; Kereszt, Attila; Mergaert, Peter; Kondorosi, Éva

2014-04-01

221

The SWI/SNF Chromatin Remodeling Complex Selectively Affects Multiple Aspects of Serotonergic Neuron Differentiation  

PubMed Central

Regulatory programs that control the specification of serotonergic neurons have been investigated by genetic mutant screens in the nematode Caenorhabditis elegans. Loss of a previously uncloned gene, ham-3, affects migration and serotonin antibody staining of the hermaphrodite-specific neuron (HSN) pair. We characterize these defects here in more detail, showing that the defects in serotonin antibody staining are paralleled by a loss of the transcription of all genes involved in serotonin synthesis and transport. This loss is specific to the HSN class as other serotonergic neurons appear to differentiate normally in ham-3 null mutants. Besides failing to migrate appropriately, the HSNs also display axon pathfinding defects in ham-3 mutants. However, the HSNs are still generated and express a subset of their terminal differentiation features in ham-3 null mutants, demonstrating that ham-3 is a specific regulator of select features of the HSNs. We show that ham-3 codes for the C. elegans ortholog of human BAF60, Drosophila Bap60, and yeast Swp73/Rsc6, which are subunits of the yeast SWI/SNF and vertebrate BAF chromatin remodeling complex. We show that the effect of ham-3 on serotonergic fate can be explained by ham-3 regulating the expression of the Spalt/SALL-type Zn finger transcription factor sem-4, a previously identified regulator of serotonin expression in HSNs and of the ham-2 Zn transcription factor, a previously identified regulator of HSN migration and axon outgrowth. Our findings provide the first evidence for the involvement of the BAF complex in the acquisition of terminal neuronal identity and constitute genetic proof by germline knockout that a BAF complex component can have cell-type-specific roles during development.

Weinberg, Peter; Flames, Nuria; Sawa, Hitoshi; Garriga, Gian; Hobert, Oliver

2013-01-01

222

Method and system for measuring multiphase flow using multiple pressure differentials  

DOEpatents

An improved method and system for measuring a multiphase flow in a pressure flow meter. An extended throat venturi is used and pressure of the multiphase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit. The differential pressures are then used to calculate the mass flow of the gas phase, the total mass flow, and the liquid phase. The method for determining the mass flow of the high void fraction fluid flow and the gas flow includes certain steps. The first step is calculating a gas density for the gas flow. The next two steps are finding a normalized gas mass flow rate through the venturi and computing a gas mass flow rate. The following step is estimating the gas velocity in the venturi tube throat. The next step is calculating the pressure drop experienced by the gas-phase due to work performed by the gas phase in accelerating the liquid phase between the upstream pressure measuring point and the pressure measuring point in the venturi throat. Another step is estimating the liquid velocity in the venturi throat using the calculated pressure drop experienced by the gas-phase due to work performed by the gas phase. Then the friction is computed between the liquid phase and a wall in the venturi tube. Finally, the total mass flow rate based on measured pressure in the venturi throat is calculated, and the mass flow rate of the liquid phase is calculated from the difference of the total mass flow rate and the gas mass flow rate.

Fincke, James R. (Idaho Falls, ID)

2001-01-01

223

Breastmilk Is a Novel Source of Stem Cells with Multilineage Differentiation Potential  

PubMed Central

The mammary gland undergoes significant remodeling during pregnancy and lactation, which is fuelled by controlled mammary stem cell (MaSC) proliferation. The scarcity of human lactating breast tissue specimens and the low numbers and quiescent state of MaSCs in the resting breast have hindered understanding of both normal MaSC dynamics and the molecular determinants that drive their aberrant self-renewal in breast cancer. Here, we demonstrate that human breastmilk contains stem cells (hBSCs) with multilineage properties. Breastmilk cells from different donors displayed variable expression of pluripotency genes normally found in human embryonic stem cells (hESCs). These genes included the transcription factors (TFs) OCT4, SOX2, NANOG, known to constitute the core self-renewal circuitry of hESCs. When cultured in the presence of mouse embryonic feeder fibroblasts, a population of hBSCs exhibited an encapsulated ESC-like colony morphology and phenotype and could be passaged in secondary and tertiary clonogenic cultures. While self-renewal TFs were found silenced in the normal resting epithelium, they were dramatically upregulated in breastmilk cells cultured in 3D spheroid conditions. Furthermore, hBSCs differentiated in vitro into cell lineages from all three germ layers. These findings provide evidence that breastmilk represents a novel and noninvasive source of patient-specific stem cells with multilineage potential and establish a method for expansion of these cells in culture. They also highlight the potential of these cells to be used as novel models to understand adult stem cell plasticity and breast cancer, with potential use in bioengineering and tissue regeneration. Stem Cells2012;30:2164–2174

Hassiotou, Foteini; Beltran, Adriana; Chetwynd, Ellen; Stuebe, Alison M; Twigger, Alecia-Jane; Metzger, Philipp; Trengove, Naomi; Lai, Ching Tat; Filgueira, Luis; Blancafort, Pilar; Hartmann, Peter E

2012-01-01

224

Can Vestibular-Evoked Myogenic Potentials Help Differentiate M?ni?re Disease from Vestibular Migraine?  

PubMed Central

Objectives To characterize both cervical and ocular vestibular-evoked myogenic potential (cVEMP, oVEMP) responses to air-conducted sound (ACS) and midline taps in Ménière disease (MD), vestibular migraine (VM), and controls, as well as to determine if cVEMP or oVEMP responses can differentiate MD from VM. Study Design Prospective cohort study. Setting Tertiary referral center. Subjects and Methods Unilateral definite MD patients (n = 20), VM patients (n = 21) by modified Neuhauser criteria, and age-matched controls (n = 28). cVEMP testing used ACS (clicks), and oVEMP testing used ACS (clicks and 500-Hz tone bursts) and midline tap stimuli (reflex hammer and Mini-Shaker). Outcome parameters were cVEMP peak-to-peak amplitudes and oVEMP n10 amplitudes. Results Relative to controls, MD and VM groups both showed reduced click-evoked cVEMP (P < .001) and oVEMP (P < .001) amplitudes. Only the MD group showed reduction in tone-evoked amplitudes for oVEMP. Tone-evoked oVEMPs differentiated MD from controls (P = .001) and from VM (P = .007). The oVEMPs in response to the reflex hammer and Mini-Shaker midline taps showed no differences between groups (P > .210). Conclusions Using these techniques, VM and MD behaved similarly on most of the VEMP test battery. A link in their pathophysiology may be responsible for these responses. The data suggest a difference in 500-Hz tone burst–evoked oVEMP responses between MD and MV as a group. However, no VEMP test that was investigated segregated individuals with MD from those with VM.

Zuniga, M. Geraldine; Janky, Kristen L.; Schubert, Michael C.; Carey, John P.

2013-01-01

225

Human versus porcine mesenchymal stromal cells: phenotype, differentiation potential, immunomodulation and cardiac improvement after transplantation.  

PubMed

Although mesenchymal stromal cells (MSCs) have been applied clinically to treat cardiac diseases, it is unclear how and to which extent transplanted MSCs exert their beneficial effects. To address these questions, pre-clinical MSC administrations are needed for which pigs appear to be the species of choice. This requires the use of porcine cells to prevent immune rejection. However, it is currently unknown to what extent porcine MSCs (pMSCs) resemble human MSCs (hMSCs). Aim of this study was to compare MSC from porcine bone marrow (BM) with human cells for phenotype, multi-lineage differentiation potential, immune-modulatory capacity and the effect on cardiac function after transplantation in a mouse model of myocardial infarction. Flow cytometric analysis revealed that pMSC expressed surface antigens also found on hMSC, including CD90, MSCA-1 (TNAP/W8B2 antigen), CD44, CD29 and SLA class I. Clonogenic outgrowth was significantly enriched following selection of CD271+ cells from BM of human and pig (129 ± 29 and 1961 ± 485 fold, respectively). hMSC and pMSC differentiated comparably into the adipogenic, osteogenic or chondrogenic lineages, although pMSC formed fat much faster than hMSC. Immuno-modulation, an important feature of hMSC, was clearly demonstrated for pMSC when co-cultured with porcine peripheral blood cells stimulated with PMA and pIL-2. Finally, pMSC transplantation after myocardial infarction attenuated adverse remodelling to a similar extent as hMSC when compared to control saline injection. These findings demonstrate that pMSCs have comparable characteristics and functionality with hMSCs, making reliable extrapolation of pre-clinical pMSC studies into a clinical setting very well possible. PMID:21973026

Noort, W A; Oerlemans, M I F J; Rozemuller, H; Feyen, D; Jaksani, S; Stecher, D; Naaijkens, B; Martens, A C; Bühring, H J; Doevendans, P A; Sluijter, J P G

2012-08-01

226

Multiple Intensity Differentiation for 3-D Surface Reconstruction With Mono-Vision Infrared Proximity Array Sensor  

Microsoft Academic Search

D depth sensor technologies, as manifested in several consumers' electronics products, have potential for a technological breakthrough in various application areas such as industrial, medical, and outdoor vision system. Depth sensing of human body motions can promote intuitive gesture inputs for natural HMI (Human Machine Interface) as well as HRI (Human Robot Interaction) to the next level. In today's industry,

Dugan Um; Dongseok Ryu; Myungjoon Kal

2011-01-01

227

Multiple solutions for nonhomogeneous neumann differential inclusion problems by the p(x)-Laplacian.  

PubMed

A class of nonlinear Neumann problems driven by p(x)-Laplacian with a nonsmooth locally Lipschitz potential (hemivariational inequality) was considered. The approach used in this paper is the variational method for locally Lipschitz functions. More precisely, Weierstrass theorem and Mountain Pass theorem are used to prove the existence of at least two nontrivial solutions. PMID:24453903

Zhou, Qing-Mei

2013-01-01

228

Multiple Solutions for Nonhomogeneous Neumann Differential Inclusion Problems by the p(x)-Laplacian  

PubMed Central

A class of nonlinear Neumann problems driven by p(x)-Laplacian with a nonsmooth locally Lipschitz potential (hemivariational inequality) was considered. The approach used in this paper is the variational method for locally Lipschitz functions. More precisely, Weierstrass theorem and Mountain Pass theorem are used to prove the existence of at least two nontrivial solutions.

Zhou, Qing-Mei

2013-01-01

229

The role of the local-multiplicative Kohn-Sham potential on the description of occupied and unoccupied orbitals  

NASA Astrophysics Data System (ADS)

The optimum local-multiplicative exchange potential was found using as input the Hartree-Fock electron density, for the molecular systems: H2, LiH, HF, NH3, CH4, H2O, N2, CO, F2, C2H2 and C2H4. The Zhao and Parr method was used to obtain the local-multiplicative potential where the kinetic energy is minimized using a constrained-search formulation of density functional theory. Two orbital sets were compared, those obtained with the nonlocal Hartree-Fock potential and those obtained with the local-multiplicative potential, both sets yielding the same electron density. As expected, the highest occupied molecular orbital (HOMO) energy was similar in both orbital sets. In contrast, the virtual orbital energies, and in particular the lowest unoccupied molecular orbital (LUMO), exhibited considerable differences. The Hartree-Fock LUMO energy goes to zero in a complete basis set limit and to nearly zero with reasonably large basis sets (e.g., augmented triple zeta) with sufficient diffuse functions added. The LUMO provided by the local-multiplicative potential using the same large basis set goes to a bounded energy not equal to zero. The nonlocal Hartree-Fock potential generates a large gap between the HOMO and LUMO energies; this difference is equal to the negative of the HOMO energy at the complete basis set limit. Contrary to this behavior, the gap obtained with the local-multiplicative potential is a reasonable approximation to the lowest experimental vertical excitation energy. For some of the molecules tested, the ordering of the orbitals corresponding to the HF and local-multiplicative potential are different.

Garza, Jorge; Nichols, Jeffrey A.; Dixon, David A.

2000-10-01

230

Brain-stem trigeminal and auditory evoked potentials in multiple sclerosis: physiological insights.  

PubMed

Thirty-six patients with multiple sclerosis were evaluated by means of brain-stem trigeminal and auditory evoked potentials. The brain-stem auditory evoked potentials (BAEPs) were abnormal in 26 patients (72.2%). Brain-stem trigeminal evoked potentials (BTEPs) yielded similar results, showing distorted waveforms and/or prolonged latencies in 25 patients (69.4%). As expected, the MRI proved to be the most efficient single test, revealing plaques in 86.4% of the patients evaluated. However, the diagnostic accuracy of MRI was lower than that provided by the combination of the BTEP and BAEP (88.9%). Moreover, in patients having signs of brain-stem involvement, the BTEP, alone and in combination with the BAEP, proved to be more sensitive than the MRI in revealing brain-stem lesions. Correlation between clinical and BTEP findings could be found only in those patients who presented with signs of trigeminal involvement such as trigeminal neuralgia or dysesthesiae. The analysis of the BTEP waveforms showed two distinct types of abnormality-a peripheral type and a central type-suggesting plaques in distinct locations. Both the BTEP and the BAEP demonstrated a correlation with the clinical course of the disease and the condition of the patient at the time of the evaluation. Relapse of the disease was associated with a marked prolongation of the central conduction time in the BTEP and in the BAEP, suggesting the application of such studies to the monitoring of unstable patients in the evaluation of new therapeutic protocols. PMID:8617153

Soustiel, J F; Hafner, H; Chistyakov, A V; Yarnitzky, D; Sharf, B; Guilburd, J N; Feinsod, M

1996-03-01

231

Multiple roles for Plasmodium berghei phosphoinositide-specific phospholipase C in regulating gametocyte activation and differentiation.  

PubMed

Critical events in the life cycle of malaria parasites are controlled by calcium-dependent signalling cascades, yet the molecular mechanisms of calcium release remain poorly understood. The synchronized development of Plasmodium berghei gametocytes relies on rapid calcium release from internal stores within 10?s of gametocytes being exposed to mosquito-derived xanthurenic acid (XA). Here we addressed the function of phosphoinositide-specific phospholipase C (PI-PLC) for regulating gametocyte activation. XA triggered the hydrolysis of PIP(2) and the production of the secondary messenger IP(3) in gametocytes. Both processes were selectively blocked by a PI-PLC inhibitor, which also reduced the early Ca(2+) signal. However, microgametocyte differentiation into microgametes was blocked even when the inhibitor was added up to 5?min after activation, suggesting a requirement for PI-PLC beyond the early mobilization of calcium. In contrast, inhibitors of calcium release through ryanodine receptor channels were active only during the first minute of gametocyte activation. Biochemical determination of PI-PLC activity was confirmed using transgenic parasites expressing a fluorescent PIP(2) /IP(3) probe that translocates from the parasite plasmalemma to the cytosol upon cell activation. Our study revealed a complex interdependency of Ca(2+) and PI-PLC activity, with PI-PLC being essential throughout gamete formation, possibly explaining the irreversibility of this process. PMID:21518218

Raabe, Andreas C; Wengelnik, Kai; Billker, Oliver; Vial, Henri J

2011-07-01

232

Differential inhibition of multiple forms of DNA polymerase alpha from IMR-32 human neuroblastoma cells.  

PubMed Central

Three forms of DNA polymerase (pol) alpha from human neuroblastoma IMR-32 were separated by DEAE column chromatography. All sedimented at approximately 7 S in 5-20% continuous sucrose density gradients. All were heat labile, with pol alpha 2 the most (90% inactivated) and pol alpha 3 the least (50% inactivated) sensitive to heating for 5 min at 50 degrees C. pol alpha 1 and alpha 2 efficiently utilized activated calf thymus DNA as template. The most active form, pol alpha 2, used both poly(dA).(dT)12-18 and poly(dT).(dA)12-18 as template at equal rates. Differential inhibition of DNA polymerase alpha activities was examined in the presence of ricin, hemin, and a nonhistone chromatin protein. All three polymerases were inhibited by both ricin (nonreduced) and hemin, with pol alpha 2 the most (80-90%) and pol alpha 3 the least (60%) sensitive in each case. In contrast, only pol alpha 2 and alpha 3 activities were inhibited (80-85%) by rat liver nonhistone chromatin protein.

Bhattacharya, P; Simet, I; Basu, S

1981-01-01

233

Disease exacerbation of multiple sclerosis is characterized by loss of terminally differentiated autoregulatory CD8+ T cells.  

PubMed

Multiple sclerosis (MS) is an inflammatory, demyelinating disease of the central nervous system (CNS). Although its etiology remains unknown, pathogenic T cells are thought to underlie MS immune pathology. We recently showed that MS patients harbor CNS-specific CD8+ Tregs that are deficient during disease relapse. We now demonstrate that CNS-specific CD8+ Tregs were cytolytic and could eliminate pathogenic CD4+ T cells. These CD8+ Tregs were present primarily in terminally differentiated (CD27-, CD45RO-) subset and their suppression was IFN?, perforin and granzyme B-dependent. Interestingly, MS patients with acute relapse displayed a significant loss in terminally differentiated CD8+ T cells, with a concurrent loss in expression of perforin and granzyme B. Pre-treatment of exacerbation-derived CD8+ T cells with IL-12 significantly restored suppressive capability of these cells through upregulation of granzyme B. Our studies uncover immune-suppressive mechanisms of CNS-specific CD8+ Tregs, and may contribute to design of novel immune therapies for MS. PMID:24657764

Cunnusamy, Khrishen; Baughman, Ethan J; Franco, Jorge; Ortega, Sterling B; Sinha, Sushmita; Chaudhary, Parul; Greenberg, Benjamin M; Frohman, Elliot M; Karandikar, Nitin J

2014-01-01

234

Differentiation of Neuromyelitis Optica from Multiple Sclerosis on Spinal Magnetic Resonance Imaging  

PubMed Central

In order to examine the accuracy of magnetic resonance imaging (MRI)–based diagnosis of neuromyelitis optica (NMO) versus multiple sclerosis (MS), we performed a retrospective, rater-blinded review of 29 cases of NMO and 30 cases of MS using the criteria of long (more than three vertebral levels), continuous lesions with a central cord location for NMO and more peripheral and patchy lesions for MS. Using these criteria, two raters were able to distinguish the two conditions with a good degree of confidence, particularly when the imaging was performed at the time of an acute cord attack. The sensitivity and specificity for diagnosis of NMO were 86.2% and 93.3%, respectively, for Rater A and 96.4% and 78.6%, respectively, for Rater B, with a kappa value of 0.72. Thus there are significant differences in lesion characteristics that allow the distinction on spinal cord imaging between MS and NMO with a moderately high degree of confidence. The location of the lesion as evident on MRI of the spine can be regarded as a distinguishing diagnostic feature between MS and NMO.

Khan, Majid; Schlakman, Bruce; Penman, Alan; Gatlin, Joseph; Herndon, Robert

2012-01-01

235

Multiple Protein Regions Contribute to Differential Activities of YABBY Proteins in Reproductive Development1[w  

PubMed Central

Members of the YABBY family of putative transcription factors participate in abaxial-adaxial identity determination in lateral organs in Arabidopsis (Arabidopsis thaliana). Two YABBY genes specifically expressed in reproductive structures, CRABS CLAW (CRC) and INNER NO OUTER (INO), have additional activities, with CRC promoting nectary development and carpel fusion, and INO responding to spatial regulation by SUPERMAN during ovule development. All YABBY coding regions, except YABBY5, were able to restore outer integument growth in ino-1 mutants when expressed from the INO promoter (PROINO). However, INO was the only YABBY family member that responded correctly to SUPERMAN to maintain the wild-type gynoapical-gynobasal asymmetry of the outer integument. By contrast, INO, FILAMENTOUS FLOWER, and YABBY3 failed to complement crc-1 when expressed from PROCRC. Roles of individual regions of CRC and INO in these effects were assessed using chimeric proteins with PROINO and PROCRC and the relatively constitutive cauliflower mosaic virus PRO35S. Regions of CRC were found to contribute additively to CRC-specific functions in nectary and carpel formation, with a nearly direct relationship between the amount of CRC included and the degree of complementation of crc-1. When combined with INO sequences, the central and carboxyl-terminal regions of CRC were individually sufficient to overcome inhibitory effects of SUPERMAN within the outer integument. Reproductive phenotypes resulting from constitutive expression were dependent on the nature of the central region with some contributions from the amino terminus. Thus, the YABBY family members have both unique and common functional capacities, and residues involved in differential activities are distributed throughout the protein sequences.

Meister, Robert J.; Oldenhof, Harriette; Bowman, John L.; Gasser, Charles S.

2005-01-01

236

Differential amplification, assembly, and relocation of multiple DNA sequences in human neuroblastomas and neuroblastoma cell lines.  

PubMed Central

DNA amplification, manifested by homogeneously staining regions in chromosomes and by extrachromosomal, double minute bodies, is characteristic of many neuroblastoma cell lines. Sequences recruited from a specific domain on the short arm of chromosome 2 (2p) are amplified in advanced-stage primary neuroblastomas, whereas sequences from distinctly different regions of 2p are amplified in the neuroblastoma cell line IMR-32. Five different DNA segments, which include the oncogene N-myc, three other fragments derived from the homogeneously staining region of the neuroblastoma cell line IMR-32, and a fifth fragment, derived from the neuroblastoma cell line NB-9, showed differential and variable amplification in 24 advanced-stage neuroblastoma tumors out of 112 tested specimens. All five fragments were mapped within the chromosomal region 2p23-2p25 by three different approaches. However, eight other fragments cloned from the homogeneously staining region of IMR-32 cells, which were not amplified in the tumor tissues examined, were mapped to two more proximal domains of 2p, thousands of kilobases apart from each other and from the chromosomal domain that is amplified in the tumors. These results establish the amplification, to different degrees, of a variable-sized segment of one domain near the terminus of 2p in advanced neuroblastomas. These tumors might ultimately be distinguished according to the pattern of amplification of DNA segments within this domain. The data presented also indicate the existence of a new and complex amplification mechanism in at least one neuroblastoma cell line (IMR-32), which involves not only relocation of DNA from specific genomic domains but also the formation of novel units by splicing together very distant DNA segments. Images

Shiloh, Y; Shipley, J; Brodeur, G M; Bruns, G; Korf, B; Donlon, T; Schreck, R R; Seeger, R; Sakai, K; Latt, S A

1985-01-01

237

Multiple Sources of Striatal Inhibition Are Differentially Affected in Huntington's Disease Mouse Models  

PubMed Central

In Huntington’s disease (HD) mouse models, spontaneous inhibitory synaptic activity is enhanced in a subpopulation of medium-sized spiny neurons (MSNs), which could dampen striatal output. We examined the potential source(s) of increased inhibition using electrophysiological and optogenetic methods to assess feedback and feedforward inhibition in two transgenic mouse models of HD. Single whole-cell patch-clamp recordings demonstrated that increased GABA synaptic activity impinges principally on indirect pathway MSNs. Dual patch recordings between MSNs demonstrated reduced connectivity between MSNs in HD mice. However, while connectivity was strictly unidirectional in controls, in HD mice bidirectional connectivity occurred. Other sources of increased GABA activity in MSNs also were identified. Dual patch recordings from fast spiking (FS) interneuron–MSN pairs demonstrated greater but variable amplitude responses in MSNs. In agreement, selective optogenetic stimulation of parvalbumin-expressing, FS interneurons induced significantly larger amplitude MSN responses in HD compared with control mice. While there were no differences in responses of MSNs evoked by activating single persistent low-threshold spiking (PLTS) interneurons in recorded pairs, these interneurons fired more action potentials in both HD models, providing another source for increased frequency of spontaneous GABA synaptic activity in MSNs. Selective optogenetic stimulation of somatostatin-expressing, PLTS interneurons did not reveal any significant differences in responses of MSNs in HD mice. These findings provide strong evidence that both feedforward and to a lesser extent feedback inhibition to MSNs in HD can potentially be sources for the increased GABA synaptic activity of indirect pathway MSNs.

Cepeda, Carlos; Galvan, Laurie; Holley, Sandra M.; Rao, Shilpa P.; Andre, Veronique M.; Botelho, Elian P.; Chen, Jane Y.; Watson, Joseph B.; Deisseroth, Karl; Levine, Michael S.

2013-01-01

238

Evaluation of electrospray differential mobility analysis for virus particle analysis: Potential applications for biomanufacturing.  

PubMed

The technique of electrospray differential mobility analysis (ES-DMA) was examined as a potential potency assay for routine virus particle analysis in biomanufacturing environments (e.g., evaluation of vaccines and gene delivery products for lot release) in the context of the International Committee of Harmonisation (ICH) Q2 guidelines. ES-DMA is a rapid particle sizing method capable of characterizing certain aspects of the structure (such as capsid proteins) and obtaining complete size distributions of viruses and virus-like particles. It was shown that ES-DMA can distinguish intact virus particles from degraded particles and measure the concentration of virus particles when calibrated with nanoparticles of known concentration. The technique has a measurement uncertainty of ?20%, is linear over nearly 3 orders of magnitude, and has a lower limit of detection of ?10(9)particles/mL. This quantitative assay was demonstrated for non-enveloped viruses. It is expected that ES-DMA will be a useful method for applications involving production and quality control of vaccines and gene therapy vectors for human use. PMID:21963394

Guha, Suvajyoti; Pease, Leonard F; Brorson, Kurt A; Tarlov, Michael J; Zachariah, Michael R

2011-12-01

239

In Vivo differentiation potential of epiblast stem cells revealed by chimeric embryo formation.  

PubMed

Chimera formation after blastocyst injection or morula aggregation is the principal functional assay of the developmental potential of mouse embryonic stem cells (ESCs). This property, which demonstrates functional equivalence between ESCs and the preimplantation epiblast, is not shared by epiblast stem cell (EpiSC) lines. Here, we show that EpiSCs derived either from postimplantation embryos or from ESCs in vitro readily generate chimeras when grafted to postimplantation embryos in whole embryo culture. EpiSC derivatives integrate and differentiate to derivatives of all three embryonic germ layers and primordial germ cells. In contrast, grafted ESCs seldom proliferate in postimplantation embryos, and fail to acquire the identity of their host-derived neighbors. EpiSCs do not incorporate efficiently into embryonic day 8.5 embryos, a stage by which pluripotency has been lost. Thus, chimera formation by EpiSCs requires a permissive environment, the postimplantation epiblast, and demonstrates functional equivalence between this cell type and EpiSCs. PMID:23200857

Huang, Yali; Osorno, Rodrigo; Tsakiridis, Anestis; Wilson, Valerie

2012-12-27

240

Comparative evaluation of differentiation potential of menstrual blood- versus bone marrow-derived stem cells into hepatocyte-like cells.  

PubMed

Menstrual blood has been introduced as an easily accessible and refreshing stem cell source with no ethical consideration. Although recent works have shown that menstrual blood stem cells (MenSCs) possess multi lineage differentiation capacity, their efficiency of hepatic differentiation in comparison to other stem cell resources has not been addressed so far. The aim of this study was to investigate hepatic differentiation capacity of MenSCs compared to bone marrow-derived stem cells (BMSCs) under protocols developed by different concentrations of hepatocyte growth factor (HGF) and oncostatin M (OSM) in combination with other components in serum supplemented or serum-free culture media. Such comparison was made after assessment of immunophenotye, trans-differentiation potential, immunogenicity and tumorigeicity of these cell types. The differential expression of mature hepatocyte markers such as albumin (ALB), cytokeratin 18 (CK-18), tyrosine aminotransferase and cholesterol 7 alpha-hydroxylase activities (CYP7A1) at both mRNA and protein levels in differentiating MenSCs was significantly higher in upper concentration of HGF and OSM (P1) compared to lower concentration of these factors (P2). Moreover, omission of serum during differentiation process (P3) caused typical improvement in functions assigned to hepatocytes in differentiated MenSCs. While up-regulation level of ALB and CYP7A1 was higher in differentiated MenSCs compared to driven BMSCs, expression level of CK-18, detected level of produced ALB and glycogen accumulation were lower or not significantly different. Therefore, based on the overall comparable hepatic differentiation ability of MenSCs with BMSCs, and also accessibility, refreshing nature and lack of ethical issues of MenSCs, these cells could be suggested as an apt and safe alternative to BMSCs for future stem cell therapy of chronic liver diseases. PMID:24505254

Khanjani, Sayeh; Khanmohammadi, Manijeh; Zarnani, Amir-Hassan; Akhondi, Mohammad-Mehdi; Ahani, Ali; Ghaempanah, Zahra; Naderi, Mohammad Mehdi; Eghtesad, Saman; Kazemnejad, Somaieh

2014-01-01

241

Comparative Evaluation of Differentiation Potential of Menstrual Blood- Versus Bone Marrow- Derived Stem Cells into Hepatocyte-Like Cells  

PubMed Central

Menstrual blood has been introduced as an easily accessible and refreshing stem cell source with no ethical consideration. Although recent works have shown that menstrual blood stem cells (MenSCs) possess multi lineage differentiation capacity, their efficiency of hepatic differentiation in comparison to other stem cell resources has not been addressed so far. The aim of this study was to investigate hepatic differentiation capacity of MenSCs compared to bone marrow-derived stem cells (BMSCs) under protocols developed by different concentrations of hepatocyte growth factor (HGF) and oncostatin M (OSM) in combination with other components in serum supplemented or serum-free culture media. Such comparison was made after assessment of immunophenotye, trans-differentiation potential, immunogenicity and tumorigeicity of these cell types. The differential expression of mature hepatocyte markers such as albumin (ALB), cytokeratin 18 (CK-18), tyrosine aminotransferase and cholesterol 7 alpha-hydroxylase activities (CYP7A1) at both mRNA and protein levels in differentiating MenSCs was significantly higher in upper concentration of HGF and OSM (P1) compared to lower concentration of these factors (P2). Moreover, omission of serum during differentiation process (P3) caused typical improvement in functions assigned to hepatocytes in differentiated MenSCs. While up-regulation level of ALB and CYP7A1 was higher in differentiated MenSCs compared to driven BMSCs, expression level of CK-18, detected level of produced ALB and glycogen accumulation were lower or not significantly different. Therefore, based on the overall comparable hepatic differentiation ability of MenSCs with BMSCs, and also accessibility, refreshing nature and lack of ethical issues of MenSCs, these cells could be suggested as an apt and safe alternative to BMSCs for future stem cell therapy of chronic liver diseases.

Zarnani, Amir-Hassan; Akhondi, Mohammad-Mehdi; Ahani, Ali; Ghaempanah, Zahra; Naderi, Mohammad Mehdi; Eghtesad, Saman; Kazemnejad, Somaieh

2014-01-01

242

Gluteal and abdominal subcutaneous adipose tissue depots as stroma cell source: gluteal cells display increased adipogenic and osteogenic differentiation potentials.  

PubMed

Human adipose-derived stroma cells (ADSCs) have successfully been employed in explorative therapeutic studies. Current evidence suggests that ADSCs are unevenly distributed in subcutaneous adipose tissue; therefore, the anatomical origin of ADSCs may influence clinical outcomes. This study was designed to investigate proliferation and differentiation capacities of ADSCs from the gluteal and abdominal depot of 8 females. All had normal BMI (22.01 ± 0.39 kg/m(2) ) and waist circumference (81.13 ± 2.33 cm). Examination by physicians and analysis of 31 laboratory parameters did not reveal possibly confounding medical disorders. Gluteal and abdominal adipose tissue was sampled by en bloc resection on day 7 (±1) after the last menses. Histological examination did not reveal significant depot-specific differences. As assessed by BrdU assay, proliferation of cells from both depots was similar after 24 h and analysis of 15 cell surface markers by flow cytometry identified the isolated cells as ADSCs, again without depot-specific differences. ADSCs from both depots differentiated poorly to chondroblasts. Gluteal ADSCs displayed significantly higher adipogenic differentiation potential than abdominal cells. Osteogenic differentiation was most pronounced in gluteal cells, whereas differentiation of abdominal ADSCs was severely impaired. Our data demonstrate a depot-specific difference in ADSC differentiation potential with abdominal cells failing to meet the criteria of multipotent ADSCs. This finding should be taken into account in future explorations of ADSC-derived therapeutic strategies. PMID:24689514

Iwen, Karl Alexander; Priewe, Anna-Christin; Winnefeld, Marc; Rose, Christian; Siemers, Frank; Rohwedel, Jürgen; Cakiroglu, Figen; Lehnert, Hendrik; Schepky, Andreas; Klein, Johannes; Kramer, Jan

2014-06-01

243

Differential and Sequential Expression of Multiple Chemokines during Elicitation of Allergic Contact Hypersensitivity  

PubMed Central

Regulation of chemokine-mediated leukocyte migration within inflammatory tissues is a complex event that cannot be mimicked and analyzed in vitro. We therefore investigated the role of macrophage- and T-lymphocyte-specific chemoattractants involved in the positioning of immune effector cells during the elicitation phase of contact hypersensitivity, a prototype of a T-lymphocyte-mediated immune reaction. Serial sections of skin biopsies obtained from sensitized individuals at distinct time intervals after epicutaneous application of allergens were hybridized with anti-sense probes of a large panel of chemokines or immunohistologically labeled with leukocyte-specific antibodies. Multifocal expression of monocyte chemoattractant protein-1 (MCP-1) was already detected after 6 hours in basal keratinocytes clearly preceding the infiltration of monocytes and T cells. Increasing basal expression of MCP-1 and, in addition, of regulated upon activation, normal T-cell expressed and secreted (RANTES) after 12 hours was accompanied by dermal expression of MCP-1, macrophage-derived chemoattractant (MDC), and RANTES and paralleled by infiltration of mononuclear cells into dermis and epidermis. Expression of the T-lymphocyte-specific chemokines IP-10 and MIG in epidermis and dermis and of MDC, pulmonary and activation-regulated chemokine (PARC), and thymus and activation-regulated chemokine (TARC) exclusively in the dermis started after 12 hours reaching maximum levels at 72 hours and was associated with infiltration of T cells into the epidermal compartment. Our data provide evidence that migrating effector cells encounter multiple chemoattractant signals in a complex spatial and temporal pattern. In particular, keratinocytes contribute to the vigorous immigration by sequential expression of MCP-1, RANTES, and interferon-inducible protein-10 (IP-10) monokine induced by gamma interferon (MIG), indicating that chemokine-mediated nonimmunological mechanisms precede and corroborate antigen-specific mechanisms during elicitation of contact hypersensitivity.

Goebeler, Matthias; Trautmann, Axel; Voss, Ariane; Brocker, Eva-Bettina; Toksoy, Atiye; Gillitzer, Reinhard

2001-01-01

244

Differential sensitivity of three marine invertebrates to copper assessed using multiple biomarkers.  

PubMed

Understanding how biomarkers relate to each other on exposure to particular contaminants in different species is key to their widespread application in environmental management. However, few studies have systematically used multiple biomarkers in more than a single species to determine the variability of sublethal effects of a particular contaminant. In this study, three marine invertebrates, the shore crab Carcinus maenas, the common limpet Patella vulgata and the blue mussel Mytilus edulis, were exposed over 7 days in the laboratory to environmentally realistic concentrations of the priority pollutant copper. A combination of molecular, cellular and physiological biomarkers was measured in each organism to detect the toxic effects of copper. Biomarkers included lysosomal stability (neutral red retention), neurotoxicity (acetylcholinesterase activity), metabolic impairment (total haemolymph protein), physiological status (heart rate) and induction of protective metallothionein proteins. P. vulgata was the most sensitive to copper with significant effects measured in all biomarkers at concentrations of 6.1 microg Cu l(-1). In C. maenas, cellular and neurotoxic endpoints were affected significantly only at 68.1 microg Cu l(-1). Exposure to copper also induced metallothionein production in crabs. Over a 7-day exposure period, M. edulis was the most tolerant species to copper with significant effects being observed at the cellular level only at 68.1 microg Cu l(-1) . In all three species, cellular and neurotoxic pathways were more sensitive to disruption than physiological processes (protein and heart rate). Results illustrate how a suite of biomarkers applied to different sentinel species can provide a 'diagnosis of stress', whereby, effects at the molecular level can be used to interpret the level of physiological impairment of the organism. PMID:15129769

Brown, R J; Galloway, T S; Lowe, D; Browne, M A; Dissanayake, A; Jones, M B; Depledge, M H

2004-02-25

245

Full-potential multiple scattering theory with space-filling cells for bound and continuum states.  

PubMed

We present a rigorous derivation of a real-space full-potential multiple scattering theory (FP-MST) that is free from the drawbacks that up to now have impaired its development (in particular the need to expand cell shape functions in spherical harmonics and rectangular matrices), valid both for continuum and bound states, under conditions for space partitioning that are not excessively restrictive and easily implemented. In this connection we give a new scheme to generate local basis functions for the truncated potential cells that is simple, fast, efficient, valid for any shape of the cell and reduces to the minimum the number of spherical harmonics in the expansion of the scattering wavefunction. The method also avoids the need for saturating 'internal sums' due to the re-expansion of the spherical Hankel functions around another point in space (usually another cell center). Thus this approach provides a straightforward extension of MST in the muffin-tin (MT) approximation, with only one truncation parameter given by the classical relation l(max) = kR(b), where k is the electron wavevector (either in the excited or ground state of the system under consideration) and R(b) is the radius of the bounding sphere of the scattering cell. Moreover, the scattering path operator of the theory can be found in terms of an absolutely convergent procedure in the l(max) --> ? limit. Consequently, this feature provides a firm ground for the use of FP-MST as a viable method for electronic structure calculations and makes possible the computation of x-ray spectroscopies, notably photo-electron diffraction, absorption and anomalous scattering among others, with the ease and versatility of the corresponding MT theory. Some numerical applications of the theory are presented, both for continuum and bound states. PMID:21393686

Hatada, Keisuke; Hayakawa, Kuniko; Benfatto, Maurizio; Natoli, Calogero R

2010-05-12

246

Prospective Differentiation of Multiple System Atrophy from Parkinson's Disease, with and without Autonomic Failure  

PubMed Central

Objective The severity, distribution, and pattern of autonomic failure appear to be different in multiple system atrophy (MSA) compared with Parkinson’s disease (PD), but reports have been retrospective reviews and have tended to exclude PD with autonomic failure (PD_AF). We report preliminary results of a prospective ongoing study of MSA and PD, with a large subset of PD_AF (25%) to evaluate autonomic indices that distinguish MSA from PD. Methods We used Consensus criteria, detailed autonomic studies (composite autonomic symptom score (COMPASS), composite autonomic severity score (CASS), thermoregulatory sweat test percent anhidrosis (TST%), plasma catecholamines, and functional scales (Unified MSA rating scale (UMSARS) I–IV, Hoehn-Yahr grading) on a prospective, repeated, and ongoing basis. Results We report the results of a study based on 52 patients with MSA (61.1±7.8 years; BMI 27.2±4.6; Hoehn-Yahr grade, 3.2±0.9; UMSARS_1 21.5±7.4; UMSARS_2, 22.7±9.0) and 29 patients with PD, including PD_AF (66.0±8.1 years; BMI 26.6±.5.5; Hoehn-Yahr grade, 2.2±0.8; UMSARS_1 10.4±6.1; UMSARS_2, 13.0±5.9). Autonomic indices were highly significantly more abnormal in MSA than PD (P<0.001) for each of: CASS (5.9±1.9 vs. 3.3±2.3), COMPASS (54.4±21.8 vs. 24.7±20.5), TST% (57.4±35.2 vs. 9.9±17.7). These differences were sustained and greater at 1 year follow-up indicating a greater rate of progression of dysautonomia in MSA than PD. Interpretation The severity, distribution, and pattern of autonomic deficits at entry will distinguish MSA from PD and MSA from PD_AF. These differences continue and increase with follow-up. Our ongoing conclusion is that autonomic function tests can separate MSA from PD. Autonomic indices support the notion that the primary lesion in PD is ganglionic/postganglionic while MSA is preganglionic.

Lipp, Axel; Sandroni, Paola; Ahlskog, J. Eric; Fealey, Robert D.; Kimpinski, Kurt; Iodice, Valeria; Gehrking, Tonette L.; Weigand, Stephen D.; Sletten, David M.; Gehrking, Jade A.; Nickander, Kim K.; Singer, Wolfgang; Maraganore, Demetrius M.; Gilman, Sid; Wenning, Gregor K.; Shults, Clifford M.; Low, Phillip A.

2010-01-01

247

Teriflunomide, an inhibitor of dihydroorotate dehydrogenase for the potential oral treatment of multiple sclerosis.  

PubMed

Teriflunomide, being developed as a potential oral treatment for multiple sclerosis (MS) by sanofi-aventis, is the active metabolite of the rheumatoid arthritis drug leflunomide. Both teriflunomide and leflunomide are inhibitors of the mitochondrial enzyme dihydroorotate dehydrogenase, which is critically involved in pyrimidine synthesis. The production of activated T-cells largely depends on de novo pyrimidine synthesis, and thus pyrimidine depletion is thought to result in the inhibition of immune cell proliferation. Therapeutic efficacy of teriflunomide has been demonstrated in vivo in an experimental autoimmune encephalomyelitis model of MS using Dark Agouti rats. In a phase II, randomized, double-blind, placebo-controlled clinical trial of patients with relapsing-remitting MS, treatment with teriflunomide reduced the number of active lesions in the brain and preliminary evidence indicated a slowing in the development of disability. Recently reported data from the phase III TEMSO clinical trial support these initial findings. Compared with current therapies, teriflunomide has the advantage of oral administration. Thus, if good efficacy is demonstrated, teriflunomide may have a role to play in the future treatment of MS. PMID:21157651

Palmer, Alan M

2010-11-01

248

NICE technology appraisals: working with multiple levels of uncertainty and the potential for bias.  

PubMed

One of the key roles of the English National Institute for Health and Clinical Excellence (NICE) is technology appraisal. This essentially involves evaluating the cost effectiveness of pharmaceutical products and other technologies for use within the National Health Service. Based on a content analysis of key documents which shed light on the nature of appraisals, this paper draws attention to the multiple layers of uncertainty and complexity which are latent within the appraisal process, and the often socially constructed mechanisms for tackling these. Epistemic assumptions, bounded rationality and more explicitly relational forms of managing knowledge are applied to this end. These findings are discussed in the context of the literature highlighting the inherently social process of regulation. A framework is developed which posits the various forms of uncertainty, and responses to these, as potential conduits of regulatory bias-in need of further research. That NICE's authority is itself regulated by other actors within the regulatory regime, particularly the pharmaceutical industry, exposes it to the threat of regulatory capture. Following Lehoux, it is concluded that a more transparent and reflexive format for technological appraisals is necessary. This would enable a more robust, defensible form of decision-making and moreover enable NICE to preserve its legitimacy in the midst of pressures which threaten this. PMID:22198480

Brown, Patrick; Calnan, Michael

2013-05-01

249

Circulating endothelial progenitor cells as potential prognostic biomarker in multiple myeloma.  

PubMed

Recent studies suggest that endothelial progenitor cells (EPCs) are mobilized from bone marrow to the peripheral circulation and aid in tumor neovascularization. In this study, circulating EPC (cEPC) numbers were assessed and correlation with clinical and laboratory parameters was determined in 75 patients with multiple myeloma (MM). Higher numbers of cEPCs (defined as CD45-/dim CD34+CD133+CD31+cells) were observed in MM as compared to healthy controls (n = 10; p < 0.001), which increased progressively from stage I to stage III (p < 0.001). A significant decline in cEPC numbers after therapy was observed in patients who attained at least a partial response (n = 47; p < 0.001). cEPCs correlated with response duration, at a baseline cut-off value of 19.6 cEPCs/?L (p = 0.006) and 6.5 cEPCs/?L after therapy (p < 0.001). This study suggests that cEPC numbers and changes in their levels may serve as a potential biomarker of disease severity, response to therapy and treatment outcome in MM. PMID:21973309

Bhaskar, Archana; Gupta, Ritu; Kumar, Lalit; Sharma, Atul; Sharma, Mehar Chand; Kalaivani, Mani; Thakur, Sonu Chand

2012-04-01

250

Effects of cryopreservation on the cell viability, proliferative capacity and neuronal differentiation potential of canine bone marrow stromal cells.  

PubMed

We investigated the cell viability, proliferative capacity and neuronal differentiation potential of canine bone marrow stromal cells (BMSCs) after cryopreservation. BMSCs were cryopreserved using cryoprotectant solutions with 10% DMSO and 10% FBS (DF group) or without DMSO and FBS (DF-free group); fresh BMSCs were used as a control. The cell viability and proliferative capacity of BMSCs were similar in the DF-free and control groups, while those in the DF group were lower. In all groups, BMSCs differentiated into neuron-like cells that stained positive against neuron markers, and the mRNA expression levels of neuron markers increased after neuronal induction. In conclusion, cryopreservation with DF-free cryoprotectant solution did not diminish the cell viability, proliferative capacity or neuronal differentiation potential of canine BMSCs. PMID:24334862

Edamura, Kazuya; Nakano, Rei; Fujimoto, Kyohei; Teshima, Kenji; Asano, Kazushi; Tanaka, Shigeo

2014-05-01

251

Effects of Cryopreservation on the Cell Viability, Proliferative Capacity and Neuronal Differentiation Potential of Canine Bone Marrow Stromal Cells  

PubMed Central

ABSTRACT We investigated the cell viability, proliferative capacity and neuronal differentiation potential of canine bone marrow stromal cells (BMSCs) after cryopreservation. BMSCs were cryopreserved using cryoprotectant solutions with 10% DMSO and 10% FBS (DF group) or without DMSO and FBS (DF-free group); fresh BMSCs were used as a control. The cell viability and proliferative capacity of BMSCs were similar in the DF-free and control groups, while those in the DF group were lower. In all groups, BMSCs differentiated into neuron-like cells that stained positive against neuron markers, and the mRNA expression levels of neuron markers increased after neuronal induction. In conclusion, cryopreservation with DF-free cryoprotectant solution did not diminish the cell viability, proliferative capacity or neuronal differentiation potential of canine BMSCs.

EDAMURA, Kazuya; NAKANO, Rei; FUJIMOTO, Kyohei; TESHIMA, Kenji; ASANO, Kazushi; TANAKA, Shigeo

2013-01-01

252

A comparison of multifocal and conventional visual evoked potential techniques in patients with optic neuritis\\/multiple sclerosis  

Microsoft Academic Search

Purpose To compare conventional visual evoked potential (cVEP) and multifocal visual evoked potential (mfVEP) methods in patients\\u000a with optic neuritis\\/multiple sclerosis (ON\\/MS). Methods mfVEPs and cVEPs were obtained from eyes of the 19 patients with multiple sclerosis confirmed on MRI scans, and from eyes\\u000a of 40 normal controls. For the mfVEP, the display was a pattern-reversal dartboard array, 48° in

Larissa K. Grover; Donald C. Hood; Quraish Ghadiali; Tomas M. Grippo; Adam S. Wenick; Vivienne C. Greenstein; Myles M. Behrens; Jeffrey G. Odel

2008-01-01

253

The transient receptor potential vanilloid-2 cation channel impairs glioblastoma stem-like cell proliferation and promotes differentiation.  

PubMed

Malignant transformation of cells resulting from enhanced proliferation and aberrant differentiation is often accompanied by changes in transient receptor potential vanilloid (TRPV) channels expression. In gliomas, recent evidence indicates that TRPV type 2 (TRPV2) negatively controls glioma cell survival and proliferation. In addition, cannabinoids, the ligands of both cannabinoid and TRPV2 receptors, promote glioblastoma stem-like cells (GSCs) differentiation and inhibit gliomagenesis. Herein, we provide evidence on the expression of TRPV2 in human GSCs and that GSCs differentiation reduces nestin and progressively increases both the glial fibrillary acidic protein (GFAP) and TRPV2 expression. Therefore, we evaluated the role of TRPV2 cation channel in GSC lines differentiation. Treatment of GSC lines with the TRPV antagonist Ruthenium Red, with ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid or knockdown of TRPV2 gene during differentiation, decreases GFAP and class III beta-tubulin (?(III)-tubulin) expression; conversely, phorbol-12-myristate-13-acetate stimulates GSCs proliferation, reduces TRPV2 expression and partially reverts astroglial differentiation. In addition, forced TRPV2 expression in GSC lines by stable TRPV2 transfection increases GFAP and ?(III)-tubulin expression and parallelly reduces proliferation. Finally, TRPV2 overexpression inhibits GSCs proliferation in a xenograft mouse model, as shown by reduced tumor diameter and mitotic index, and promotes the differentiation of GSCs toward a more mature glial phenotype. Overall, our results demonstrate that TRPV2 promotes in vitro and in vivo GSCs differentiation and inhibits their proliferation. Better understanding of the molecular mechanisms that regulate the balance between proliferation and differentiation of GSCs would lead to more specific and efficacious pharmacological approaches. PMID:22492283

Morelli, Maria Beatrice; Nabissi, Massimo; Amantini, Consuelo; Farfariello, Valerio; Ricci-Vitiani, Lucia; di Martino, Simona; Pallini, Roberto; Larocca, Luigi Maria; Caprodossi, Sara; Santoni, Matteo; De Maria, Ruggero; Santoni, Giorgio

2012-10-01

254

DIFFERENTIAL TOLERANCE AMONG CRYPTIC SPECIES: A POTENTIAL CAUSE OF POLLUTANT-RELATED REDUCTIONS IN GENETIC DIVERSITY  

Microsoft Academic Search

Differential mortality of cryptic species (i.e., morphologically similar but genetically distinct sibling species) may contribute to observed reductions in genetic diversity at contaminated sites if the members of a complex of cryptic species exhibit differential responses to the contaminants that are present. We conducted toxicity bioassays with both polynuclear aromatic hy- drocarbon and metal contamination on Cletocamptus fourchensisand C. stimpsoni

AXAYACATL ROCHA-OLIVARES; JOHN W. F LEEGER; DAVID W. F OLTZ

2004-01-01

255

Diagnostic Accuracy of Apparent Diffusion Coefficient and 123I-Metaiodobenzylguanidine for Differentiation of Multiple System Atrophy and Parkinson's Disease  

PubMed Central

Background It is often hard to differentiate Parkinson’s disease (PD) and parkinsonian variant of multiple system atrophy (MSA-P), especially in the early stages. Cardiac sympathetic denervation and putaminal rarefaction are specific findings for PD and MSA-P, respectively. Purpose We investigated diagnostic accuracy of putaminal apparent diffusion coefficient (ADC) test for MSA-P and 123I-metaiodobenzylguanidine (MIBG) scintigram for PD, especially in early-stage patients. Methods The referral standard diagnosis of PD and MSA-P were the diagnostic criteria of the United Kingdom Parkinson’s Disease Society Brain Bank Criteria and the second consensus criteria, respectively. Based on the referral standard criteria, diagnostic accuracy [area under the receiver-operator characteristic curve (AUC), sensitivity and specificity] of the ADC and MIBG tests was estimated retrospectively. Diagnostic accuracy of these tests performed within 3 years of symptom onset was also investigated. Results ADC and MIBG tests were performed on 138 patients (20 MSA and 118 PD). AUC was 0.95 and 0.83 for the ADC and MIBG tests, respectively. Sensitivity and specificity were 85.0% and 89.0% for MSA-P diagnosis by ADC test and 67.0% and 80.0% for PD diagnosis by MIBG test. When these tests were restricted to patients with disease duration ?3 years, the sensitivity and specificity were 75.0% and 91.4% for the ADC test (MSA-P diagnosis) and 47.7% and 92.3% for the MIBG test (PD diagnosis). Conclusions Both tests were useful in differentiating between PD and MSA-P, even in the early stages. In early-stage patients, elevated putaminal ADC was a diagnostic marker for MSA-P. Despite high specificity of the MIBG test, careful neurological history and examinations were required for PD diagnosis because of possible false-negative results.

Umemura, Atsushi; Oeda, Tomoko; Hayashi, Ryutaro; Tomita, Satoshi; Kohsaka, Masayuki; Yamamoto, Kenji; Sawada, Hideyuki

2013-01-01

256

Comparison of differentiation potential of male mouse adipose tissue and bone marrow derived-mesenchymal stem cells into germ cells  

PubMed Central

Background: Recent publications about differentiation of stem cells to germ cells have motivated researchers to make new approaches to infertility. In vitro production of germ cells improves understanding differentiation process of male and female germ cells. Due to the problem of using embryonic stem cells (ESC), it’s necessary the mentioned cells be replaced with some adult multi-potent stem cells in laboratories. Objective: The aim of this study was to obtain germ cells from appropriate source beyond ESC and compare differential potentials of adipocytes derived stem cells (ADMSCs) with bone marrow derived stem cells (BMMSCs). Materials and Methods: To find multi-potential entity, after providing purified ADMSCs and BMMSCs, differentiation to osteoblast and adipocyte was confirmed by using appropriate culture medium. To confirm mesenchymal lineage production superficial markers (expression of CD90 and CD44 and non-expression of CD45 and CD31) were investigated by flowcytometry. Then the cells were differentiated to germ cells in inductive medium containing retinoic acid for 7days. To evaluate germ cells characteristic markers [Dazl (Deleted in azoospermia-like), Mvh (Mouse vasa homolog gene), Stra8 (Stimulated by retinoic acid) and Scp3 (Synaptonemal complex protein 3)] flowcytometry, imunoflorescence and real time PCR were used. Results: Both types of cells were able to differentiate into osteoblast and adipocyte cells and presentation of stem cell superficial markers (CD90, CD44) and absence of endothelial and blood cell markers (CD31, CD45) were confirmative The flowcytometry, imunoflorescence and real time PCR results showed remarkable expression of germ cells characteristic markers (Mvh, Dazl, Stra8, and Scp3). Conclusion: It was found that although ADMSCs were attained easier and also cultured and differentiated rapidly, germ cell markers were expressed in BMMSCs significantly more than ADMSCs. This article extracted from M.Sc. thesis. (Maryam Hosseinzadeh Shirzeily)

Hosseinzadeh Shirzeily, Maryam; Pasbakhsh, Parichehr; Amidi, Fardin; Mehrannia, Kobra; Sobhani, Aligholi

2013-01-01

257

Gait analysis at multiple speeds reveals differential functional and structural outcomes in response to graded spinal cord injury.  

PubMed

Open-field behavioral scoring is widely used to assess spinal cord injury (SCI) outcomes, but has limited usefulness in describing subtle changes important for posture and locomotion. Additional quantitative methods are needed to increase the resolution of locomotor outcome assessment. This study used gait analysis at multiple speeds (GAMS) across a range of mild-to-severe intensities of thoracic SCI in the rat. Overall, Basso, Beattie, and Bresnahan (BBB) scores and subscores were assessed, and detailed automated gait analysis was performed at three fixed walking speeds (3.5, 6.0, and 8.5?cm/sec). Variability in hindpaw brake, propel, and stance times were analyzed further by integrating across the stance phase of stepping cycles. Myelin staining of spinal cord sections was used to quantify white matter loss at the injury site. Varied SCI intensity produced graded deficits in BBB score, BBB subscores, and spinal cord white matter and total volume loss. GAMS measures of posture revealed decreased paw area, increased limb extension, altered stance width, and decreased values for integrated brake, propel, and stance. Measures of coordination revealed increased stride frequency concomitant with decreased stride length, resulting in deviation from consistent forelimb/hindlimb coordination. Alterations in posture and coordination were correlated to impact severity. GAMS results correlated highly with functional and histological measures and revealed differential relationships between sets of GAMS dynamics and cord total volume loss versus epicenter myelin loss. Automated gait analysis at multiple speeds is therefore a useful tool for quantifying nuanced changes in gait as an extension of histological and observational methods in assessing SCI outcomes. PMID:24405378

Krizsan-Agbas, Dora; Winter, Michelle K; Eggimann, Linda S; Meriwether, Judith; Berman, Nancy E; Smith, Peter G; McCarson, Kenneth E

2014-05-01

258

Assessing Visual Pathway Function in Multiple Sclerosis Patients with Multifocal Visual Evoked Potentials  

PubMed Central

Background Multifocal visual evoked potentials (mfVEP) provide topographic measure of visual response amplitude and latency. Objective To evaluate the sensitivity and specificity of mfVEP technique in detecting visual abnormalities in multiple sclerosis (MS) patients. Methods mfVEPs were recorded from 74 MS patients with history of optic neuritis (MS-ON, n=74 eyes) or without (MS-no-ON, n=71 eyes), and 50 normal subjects (controls, n=100 eyes) using a 60-sector pattern reversal dartboard stimuli (VERIS). Amplitude and latency for each sector were compared to normative data and assigned probabilities. Size and location of clusters of adjacent abnormal sectors (p < 5%) were examined. Results Mean response amplitudes were 0.39±0.02SE, 0.53±0.02, and 0.60±0.01 for MS-ON, MS-no-ON and control groups, respectively, with significant differences between all groups (p<0.0001). Mean latencies (ms; relative to normative data) were 12.7±1.3SE (MS-ON), 4.3±1.1 (MS-no-ON), and 0.3±0.4 (controls); group differences again significant (p<0.0001). Half the MS-ON eyes had clusters larger than 5 sectors compared to 13% in MS-no-ON and 2% in controls. Abnormal sectors were diffusely distributed, although the largest cluster was smaller than 15 sectors in two thirds of MS-ON eyes. Cluster criteria combining amplitude and latency showed an area of 0.96 under the receiver operating characteristic curve yielding a criterion with 91% sensitivity and 95% specificity. Conclusions The mfVEP provides high sensitivity and specificity in detecting abnormalities in visual function in MS patients.

Laron, Michal; Cheng, Han; Zhang, Bin; Schiffman, Jade S.; Tang, Rosa A.; Frishman, Laura J.

2010-01-01

259

Characterizing the existing and potential structural space of proteins by large-scale multiple loop permutations  

PubMed Central

Worldwide structural genomics projects are increasing structure coverage of sequence space but have not significantly expanded the protein structure space itself (i.e. number of unique structural folds) since 2007. Discovering new structural folds experimentally by directed evolution and random recombination of secondary-structure blocks is also proved rarely successful. Meanwhile, previous computational efforts for large-scale mapping of protein structure space are limited to simple model proteins and led to an inconclusive answer on the completeness of the existing, observed protein structure space. Here, we build novel protein structures by extending naturally occurring circular (single-loop) permutation to multiple-loop permutations (MLP). These structures are clustered by structural similarity measure called TM-Score. The computational technique allows us to produce different structural clusters on the same naturally occurring, packed, stable core but with alternatively connected secondary-structure segments. A large-scale MLP of 2936 SCOP domains reproduces those existing structural clusters (63%) mostly as hubs for many non-redundant sequences and illustrates newly discovered novel clusters as islands adopted by a few sequences only. Results further show that there exist a significant number of novel, potentially stable clusters for medium or large-size single-domain proteins, in particular (>100 amino-acid residues) that are either not yet adopted by nature or adopted only by a few sequences. This study suggests that MLP provides a simple yet highly effective tool for engineering and design of novel protein structures (including naturally knotted proteins). The implication of recovering CASP new-fold targets by MLP on template-based structure prediction is also discussed. Our MLP structures are available for download at the publication page of the website http://sparks.informatics.iupui.edu.

Dai, Liang; Zhou, Yaoqi

2011-01-01

260

A DNA repair pathway score predicts survival in human multiple myeloma: the potential for therapeutic strategy.  

PubMed

DNA repair is critical to resolve extrinsic or intrinsic DNA damage to ensure regulated gene transcription and DNA replication. These pathways control repair of double strand breaks, interstrand crosslinks, and nucleotide lesions occurring on single strands. Distinct DNA repair pathways are highly inter-linked for the fast and optimal DNA repair. A deregulation of DNA repair pathways may maintain and promote genetic instability and drug resistance to genotoxic agents in tumor cells by specific mechanisms that tolerate or rapidly bypass lesions to drive proliferation and abrogate cell death. Multiple Myeloma (MM) is a plasma cell disorder characterized by genetic instability and poor outcome for some patients, in which the compendium of DNA repair pathways has as yet not been assessed for a disease-specific prognostic relevance. We design a DNA repair risk score based on the expression of genes coding for proteins involved in DNA repair in MM cells. From a consensus list of 84 DNA repair genes, 17 had a bad prognostic value and 5 a good prognostic value for both event-free and overall survival of previously-untreated MM patients. The prognostic information provided by these 22 prognostic genes was summed within a global DNA repair score (DRScore) to take into account the tight linkage of repair pathways. DRscore was strongly predictive for both patients' event free and overall survivals. Also, DRscore has the potential to identify MM patients whose tumor cells are dependent on specific DNA repair pathways to design treatments that induce synthetic lethality by exploiting addiction to deregulated DNA repair pathways. PMID:24809299

Kassambara, Alboukadel; Gourzones-Dmitriev, Claire; Sahota, Surinder; Rème, Thierry; Moreaux, Jérôme; Goldschmidt, Hartmut; Constantinou, Angelos; Pasero, Philippe; Hose, Dirk; Klein, Bernard

2014-05-15

261

A DNA repair pathway score predicts survival in human multiple myeloma: the potential for therapeutic strategy  

PubMed Central

DNA repair is critical to resolve extrinsic or intrinsic DNA damage to ensure regulated gene transcription and DNA replication. These pathways control repair of double strand breaks, interstrand crosslinks, and nucleotide lesions occurring on single strands. Distinct DNA repair pathways are highly inter-linked for the fast and optimal DNA repair. A deregulation of DNA repair pathways may maintain and promote genetic instability and drug resistance to genotoxic agents in tumor cells by specific mechanisms that tolerate or rapidly bypass lesions to drive proliferation and abrogate cell death. Multiple Myeloma (MM) is a plasma cell disorder characterized by genetic instability and poor outcome for some patients, in which the compendium of DNA repair pathways has as yet not been assessed for a disease-specific prognostic relevance. We design a DNA repair risk score based on the expression of genes coding for proteins involved in DNA repair in MM cells. From a consensus list of 84 DNA repair genes, 17 had a bad prognostic value and 5 a good prognostic value for both event-free and overall survival of previously-untreated MM patients. The prognostic information provided by these 22 prognostic genes was summed within a global DNA repair score (DRScore) to take into account the tight linkage of repair pathways. DRscore was strongly predictive for both patients' event free and overall survivals. Also, DRscore has the potential to identify MM patients whose tumor cells are dependent on specific DNA repair pathways to design treatments that induce synthetic lethality by exploiting addiction to deregulated DNA repair pathways.

Kassambara, Alboukadel; Gourzones-Dmitriev, Claire; Sahota, Surinder; Reme, Thierry; Moreaux, Jerome; Goldschmidt, Hartmut; Constantinou, Angelos; Pasero, Philippe; Hose, Dirk; Klein, Bernard

2014-01-01

262

Motor evoked potentials in multiple sclerosis patients without walking limitation: amplitude vs. conduction time abnormalities.  

PubMed

We used Motor Evoked Potentials (MEPs), elicited by transcranial magnetic stimulation, for assessing a motor pathways dysfunction in a selected group of Multiple Sclerosis (MS) patients, without limitation in walking. We selected 32 Relapsing Remitting MS patients, in remission phase, with EDSS < or = 3.5 and 20 healthy individuals with similar height and age distribution. We measured the following MEP parameters: motor thresholds; central motor conduction time (CMCT); amplitude and area, both expressed as MEP/CMAP ratio. Patients were divided into two groups according to the EDSS score: non-disabled group (ND; EDSS 0-1.5) and disabled group (D; EDSS 2-3.5). Mean average MEP values were significantly different in the patients compared with the controls. Even in MS patients with no or minor neurological signs (ND group), MEP parameters showed differences from controls and furthermore all MEP parameters were significantly different in the D group compared with the ND group. The 75% of the patients had an amplitude or area alteration; this percentage was significantly higher than the percentage of patients with a CMCT alteration (56.2%). In addition, CMCT increase was always associated with reduced amplitude and area, but amplitude and area alterations were present also in patients with normal CMCT. In early stages of MS, the higher percentage shown in alteration of MEP amplitudes and areas as opposed to CMCTs has not previously been highlighted in the literature. Independently of its pathogenesis (demyelination or axonal loss), the amplitude or area decrease should be considered in clinical trials and in follow-up studies, as a marker of the motor pathways dysfunction, at least as much as CMCT increase. PMID:17308868

Gagliardo, Andrea; Galli, Francesca; Grippo, Antonello; Amantini, Aldo; Martinelli, Cristiana; Amato, Maria Pia; Borsini, Walter

2007-02-01

263

Vestibular-evoked myogenic potentials, clinical evaluation, and imaging findings in multiple sclerosis.  

PubMed

Vestibular-evoked myogenic potentials (VEMP), short-latency electromyographic responses elicited by acoustic stimuli, evaluate the function of vestibulocollic reflex and may give information about brainstem function. The aim of the present study is to evaluate the potential contribution of VEMP to the diagnosis of multiple sclerosis (MS). Fifty patients with MS and 30 healthy control subjects were included in this study. The frequency of VEMP p1-n1 and n2-p2 waves; mean p1, n1, n2, and p2 latency; and mean p1-n1 and n2-p2 amplitude were determined. The relation between clinical and imaging findings and VEMP parameters was evaluated. The p1-n1 and n2-p2 waves were more frequently absent in MS than in control subjects [p1-n1 wave absent: MS, 25 (25 %) ears; control, 6 (10 %) ears; P ? 0.02] [n2-p2 wave absent: MS, 44 (44 %) ears; control, 7 (12 %) ears; P ? 0.001]. The mean p1-n1 amplitude was lower in MS than in control subjects (MS, 19.1 ± 7.2 ?V; control, 23.3 ± 7.4 ?V; P ? 0.002). A total of 24/50 (48 %) MS patients had VEMP abnormalities (absent responses and/or prolonged latencies). VEMP abnormalities were more frequent in patients with than without vestibular symptoms (P ? 0.02) and with brainstem functional system score (FSS) ? 1 than FSS = 0 (P ? 0.02). In patients with MS, absence of p1-n1 wave was more frequent in patients with than without vestibular symptoms [absence of p1-n1 wave: vestibular symptoms, 9 (45 %) ears; no vestibular symptoms, 16 (20 %) ears; P ? 0.03] and patients with Expanded Disability Status Scale (EDSS) score ? 5.5 [absence of p1-n1 wave: EDSS ? 5.5, 7 (70 %) ears; EDSS <5.5, 18 (20 %) ears; P ? 0.001]. Abnormal VEMP may be noted in MS patients, especially those with vestibular symptoms and greater disability. The VEMP test may complement other studies for diagnosis and follow-up of patients with MS. PMID:23807120

Güven, Hayat; Bay?r, Omer; Aytaç, Emrah; Ozdek, Ali; Como?lu, Selim Selçuk; Korkmaz, Hakan

2014-02-01

264

"So Much Potential in Reading!" Developing Meaningful Literacy Routines for Students with Multiple Disabilities  

ERIC Educational Resources Information Center

Children with multiple disabilities, often experience challenges in communication, mobility, and learning. Despite these challenges, substantial research exists that documents successful educational methods and strategies for these students. Specifically, students with multiple disabilities have successfully been taught to use a voice output…

Fenlon, Amanda G.; McNabb, Jessica; Pidlypchak, Harmony

2010-01-01

265

Insights Into the Molecular Pathogenesis of Progression in Multiple Sclerosis: Potential Implications for Future Therapies  

Microsoft Academic Search

espite recent advances in the diagnosis and treatment of multiple sclerosis, we still lack a consensus regarding the causes, pathogenesis, and mechanisms of disease pro- gression. Current evidence indicates that multiple sclerosis is an inflammatory neu- rodegenerative disorder in which both adaptive and innate immunity play impor- tant roles in initiation and maintenance of the disease. Recent evidence supports the

Jaime Imitola; Tanuja Chitnis; Samia J. Khoury

2006-01-01

266

Marine algae possess therapeutic potential for Ca-mineralization via osteoblastic differentiation.  

PubMed

One of the important natural product investigations from marine algae is to focus on the pharmaceutically important compounds that can be applied in bone health. Osteoporosis is one of the bone diseases caused by an imbalance between bone formation and resorption. Promotion of osteoblast differentiation is one of the best therapeutic ways to combat osteoporosis. Osteoblasts are the cells responsible for bone formation by increasing the proliferation of the osteoblastic lineage or inducing differentiation of the osteoblasts. In this review, we describe the central effects of osteoblast differentiation by various bone therapy biomaterials from marine algae. PMID:22054966

Nguyen, Minh Hong Thi; Jung, Won-Kyo; Kim, Se-Kwon

2011-01-01

267

Multipotential differentiation of human urine-derived stem cells: potential for therapeutic applications in urology.  

PubMed

We sought to biologically characterize and identify a subpopulation of urine-derived stem cells (USCs) with the capacity for multipotent differentiation. We demonstrated that single USCs can expand to a large population with 60-70 population doublings. Nine of 15 individual USC clones expressed detectable levels of telomerase and have long telomeres. These cells expressed pericyte and mesenchymal stem cell markers. Upon induction with appropriate media in vitro, USCs differentiated into bladder-associated cell types, including functional urothelial and smooth muscle cell lineages. When the differentiated USCs were seeded onto a scaffold and subcutaneously implanted into nude mice, multilayered tissue-like structures formed consisting of urothelium and smooth muscle. Additionally, USCs were able to differentiate into endothelial, osteogenic, chondrogenic, adipogenic, skeletal myogenic, and neurogenic lineages but did not form teratomas during the 1-month study despite telomerase activity. USCs may be useful in cell-based therapies and tissue engineering applications, including urogenital reconstruction. PMID:23666768

Bharadwaj, Shantaram; Liu, Guihua; Shi, Yingai; Wu, Rongpei; Yang, Bin; He, Tongchuan; Fan, Yuxin; Lu, Xinyan; Zhou, Xiaobo; Liu, Hong; Atala, Anthony; Rohozinski, Jan; Zhang, Yuanyuan

2013-09-01

268

Retinoic Acids Potentiate BMP9Induced Osteogenic Differentiation of Mesenchymal Progenitor Cells  

Microsoft Academic Search

BackgroundAs one of the least studied bone morphogenetic proteins (BMPs), BMP9 is one of the most osteogenic BMPs. Retinoic acid (RA) signaling is known to play an important role in development, differentiation and bone metabolism. In this study, we investigate the effect of RA signaling on BMP9-induced osteogenic differentiation of mesenchymal progenitor cells (MPCs).Methodology\\/Principal FindingsBoth primary MPCs and MPC line

Wenli Zhang; Zhong-Liang Deng; Liang Chen; Guo-Wei Zuo; Qing Luo; Qiong Shi; Bing-Qiang Zhang; Eric R. Wagner; Farbod Rastegar; Stephanie H. Kim; Wei Jiang; Jikun Shen; Enyi Huang; Yanhong Gao; Jian-Li Gao; Jian-Zhong Zhou; Jinyong Luo; Jiayi Huang; Xiaoji Luo; Yang Bi; Yuxi Su; Ke Yang; Hao Liu; Hue H. Luu; Rex C. Haydon; Tong-Chuan He; Bai-Cheng He

2010-01-01

269

Usefulness of Diffusion-Weighted MRI for Differentiation between Parkinson's Disease and Parkinson Variant of Multiple System Atrophy  

PubMed Central

Background and Purpose: Several studies have reported that diffusion-weighted imaging (DWI) is able to help discriminate a Parkinson variant of multiple system atrophy (MSA-p) from Parkinson’s disease (PD) on the basis of the increased regional apparent diffusion coefficient (rADC). We analyzed the usefulness of DWI by using the rADC for differential diagnosis between MSA-p and PD and investigated the correlation between the rADC value and clinical features of MSA-p and PD. Methods: Twelve patients with PD and 10 with MSA-p were studied. The rADC value was determined in different brain regions, including the dorsal putamen (DP) and middle cerebellar peduncles (MCP). Results: The rADC values of the DP showed a greater increase in MSA-p patients than in PD patients (p=0.03). MSA-p patients also presented increased rADC values of the MCP compared with PD patients (p=0.0001). In particular, the sensitivity, specificity and positive predictive values of the MCP rADC were higher than those of the DP rADC. However, DP and MCP rADC values were not correlated with clinical features in either MSA or PD patients. Conclusions: DWI discriminated between PD and MSA-p based on rADC values in DP and MCP. The MCP rADC value, in particular, could better discriminate MSA-p from PD.

Chung, Eun Joo; Kim, Eung Gyu; Bae, Jong Seok; Eun, Choong Ki; Lee, Kwang Sig; Oh, Minkyung; Kim, Sang Jin

2009-01-01

270

Cellular network entropy as the energy potential in Waddington's differentiation landscape  

NASA Astrophysics Data System (ADS)

Differentiation is a key cellular process in normal tissue development that is significantly altered in cancer. Although molecular signatures characterising pluripotency and multipotency exist, there is, as yet, no single quantitative mark of a cellular sample's position in the global differentiation hierarchy. Here we adopt a systems view and consider the sample's network entropy, a measure of signaling pathway promiscuity, computable from a sample's genome-wide expression profile. We demonstrate that network entropy provides a quantitative, in-silico, readout of the average undifferentiated state of the profiled cells, recapitulating the known hierarchy of pluripotent, multipotent and differentiated cell types. Network entropy further exhibits dynamic changes in time course differentiation data, and in line with a sample's differentiation stage. In disease, network entropy predicts a higher level of cellular plasticity in cancer stem cell populations compared to ordinary cancer cells. Importantly, network entropy also allows identification of key differentiation pathways. Our results are consistent with the view that pluripotency is a statistical property defined at the cellular population level, correlating with intra-sample heterogeneity, and driven by the degree of signaling promiscuity in cells. In summary, network entropy provides a quantitative measure of a cell's undifferentiated state, defining its elevation in Waddington's landscape.

Banerji, Christopher R. S.; Miranda-Saavedra, Diego; Severini, Simone; Widschwendter, Martin; Enver, Tariq; Zhou, Joseph X.; Teschendorff, Andrew E.

2013-10-01

271

Effects of long-term differential fertilization on eukaryotic microbial communities in an arable soil: a multiple barcoding approach.  

PubMed

To understand the fine-scale effects of changes in nutrient availability on eukaryotic soil microorganisms communities, a multiple barcoding approach was used to analyse soil samples from four different treatments in a long-term fertilization experiment. We performed PCR amplification on soil DNA with primer pairs specifically targeting the 18S rRNA genes of all eukaryotes and three protist groups (Cercozoa, Chrysophyceae-Synurophyceae and Kinetoplastida) as well as the ITS gene of fungi and the 23S plastid rRNA gene of photoautotrophic microorganisms. Amplicons were pyrosequenced, and a total of 88 706 quality filtered reads were clustered into 1232 operational taxonomic units (OTU) across the six data sets. Comparisons of the taxonomic coverage achieved based on overlapping assignment of OTUs revealed that half of the eukaryotic taxa identified were missed by the universal eukaryotic barcoding marker. There were only little differences in OTU richness observed between organic- (farmyard manure), mineral- and nonfertilized soils. However, the community compositions appeared to be strongly structured by organic fertilization in all data sets other than that generated using the universal eukaryotic 18S rRNA gene primers, whereas mineral fertilization had only a minor effect. In addition, a co-occurrence based network analysis revealed complex potential interaction patterns between OTUs from different trophic levels, for example between fungivorous flagellates and fungi. Our results demonstrate that changes in pH, moisture and organic nutrients availability caused shifts in the composition of eukaryotic microbial communities at multiple trophic levels. PMID:24888892

Lentendu, Guillaume; Wubet, Tesfaye; Chatzinotas, Antonis; Wilhelm, Christian; Buscot, François; Schlegel, Martin

2014-07-01

272

Culture Conditions Affect Cardiac Differentiation Potential of Human Pluripotent Stem Cells  

PubMed Central

Human pluripotent stem cells (hPSCs), including human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs), are capable of differentiating into any cell type in the human body and thus can be used in studies of early human development, as cell models for different diseases and eventually also in regenerative medicine applications. Since the first derivation of hESCs in 1998, a variety of culture conditions have been described for the undifferentiated growth of hPSCs. In this study, we cultured both hESCs and hiPSCs in three different culture conditions: on mouse embryonic fibroblast (MEF) and SNL feeder cell layers together with conventional stem cell culture medium containing knockout serum replacement and basic fibroblast growth factor (bFGF), as well as on a Matrigel matrix in mTeSR1 medium. hPSC lines were subjected to cardiac differentiation in mouse visceral endodermal-like (END-2) co-cultures and the cardiac differentiation efficiency was determined by counting both the beating areas and Troponin T positive cells, as well as studying the expression of OCT-3/4, mesodermal Brachyury T and NKX2.5 and endodermal SOX-17 at various time points during END-2 differentiation by q-RT-PCR analysis. The most efficient cardiac differentiation was observed with hPSCs cultured on MEF or SNL feeder cell layers in stem cell culture medium and the least efficient cardiac differentiation was observed on a Matrigel matrix in mTeSR1 medium. Further, hPSCs cultured on a Matrigel matrix in mTeSR1 medium were found to be more committed to neural lineage than hPSCs cultured on MEF or SNL feeder cell layers. In conclusion, culture conditions have a major impact on the propensity of the hPSCs to differentiate into a cardiac lineage.

Ojala, Marisa; Rajala, Kristiina; Pekkanen-Mattila, Mari; Miettinen, Marinka; Huhtala, Heini; Aalto-Setala, Katriina

2012-01-01

273

Evidence-based assessment of potential use of fingolimod in treatment of relapsing multiple sclerosis  

PubMed Central

Multiple sclerosis is an autoimmune inflammatory demyelinating disease of the central nervous system and represents one of the most common causes of chronic neurologic disability in young adults. All the current disease-modifying drugs are administered parenterally, and can be associated with varying degrees of injection site or infusion-related reactions. Together with other side effects, the parenteral route of administration is one of the key factors affecting adherence to therapy in multiple sclerosis. Fingolimod (FTY720) is an immunomodulator that acts on sphingosine 1-phosphate (S1P) receptors and is the first oral drug approved by the US Food and Drug Administration for the treatment of relapsing-remitting multiple sclerosis. Downmodulation of S1P receptor type 1 (S1P1) slows the egress of lymphocytes from lymph nodes and recirculation to the central nervous system, reduces astrogliosis, and inhibits angiogenesis during chronic neuroinflammation. Fingolimod also regulates the migration of B cells and dendritic cells, and enhances endothelial barrier function. Results from Phase II and III clinical trials provide robust evidence of the efficacy of fingolimod in relapsing-remitting multiple sclerosis. While some caution should be exercised in terms of safety issues, the introduction of fingolimod represents a great advance in the treatment of relapsing-remitting multiple sclerosis. The pharmacologic data on fingolimod and its efficacy and safety in multiple sclerosis are reviewed in this paper.

Portaccio, Emilio

2011-01-01

274

Transient receptor potential A1 is a sensory receptor for multiple products of oxidative stress.  

PubMed

Transient receptor potential A1 (TRPA1) is expressed in a subset of nociceptive sensory neurons where it acts as a sensor for environmental irritants, including acrolein, and some pungent plant ingredients such as allyl isothiocyanate and cinnamaldehyde. These exogenous compounds activate TRPA1 by covalent modification of cysteine residues. We have used electrophysiological methods and measurements of intracellular calcium concentration ([Ca(2+)](i)) to show that TRPA1 is activated by several classes of endogenous thiol-reactive molecules. TRPA1 was activated by hydrogen peroxide (H(2)O(2); EC(50), 230 microM), by endogenously occurring alkenyl aldehydes (EC(50): 4-hydroxynonenal 19.9 microM, 4-oxo-nonenal 1.9 microM, 4-hydroxyhexenal 38.9 microM) and by the cyclopentenone prostaglandin, 15-deoxy-delta(12,14)-prostaglandin J(2) (15d-PGJ(2), EC(50): 5.6 microM). The effect of H(2)O(2) was reversed by treatment with dithiothreitol indicating that H(2)O(2) acts by promoting the formation of disulfide bonds whereas the actions of the alkenyl aldehydes and 15d-PGJ(2) were not reversed, suggesting that these agents form Michael adducts. H(2)O(2) and the naturally occurring alkenyl aldehydes and 15d-PGJ(2) acted on a subset of isolated rat and mouse sensory neurons [approximately 25% of rat dorsal root ganglion (DRG) and approximately 50% of nodose ganglion neurons] to evoke a depolarizing inward current and an increase in [Ca(2+)](i) in TRPA1 expressing neurons. The abilities of H(2)O(2), alkenyl aldehydes and 15d-PGJ(2) to raise [Ca(2+)](i) in mouse DRG neurons were greatly reduced in neurons from trpa1(-/-) mice. Furthermore, intraplantar injection of either H(2)O(2) or 15d-PGJ2 evoked a nocifensive/pain response in wild-type mice, but not in trpa1(-/-) mice. These data demonstrate that multiple agents produced during episodes of oxidative stress can activate TRPA1 expressed in sensory neurons. PMID:18322093

Andersson, David A; Gentry, Clive; Moss, Sian; Bevan, Stuart

2008-03-01

275

L1 is a potential marker for poorly-differentiated pancreatic neuroendocrine carcinoma  

PubMed Central

AIM: To determine the expression of L1 in pancreatic neuroendocrine tumor and to correlate it with WHO classification of this tumor. METHODS: We retrospectively analyzed L1 expression in 63 cases of pancreatic neuroendocrine tumor by immunohistochemistry on paraffin sections of primary tumors or metastases. Staining was performed by peroxidase technique with monoclonal antibody UJ127.11 against human L1. All tumors were classified according to WHO classification as well-differentiated neuroendocrine tumors and carcinomas or poorly-differentiated neuroendocrine carcinomas. RESULTS: L1 was detected in 5 (7.9%) of 63 pancreatic neuroendocrine tumors. Four (44.4%) of 9 poorly-differentiated carcinomas expressed L1. In contrast, only 1 (1.9%) of 54 well-differentiated tumors or carcinomas was positive for L1. No expression was found in Langerhans islet cells of normal pancreatic tissue. Cross table analysis showed a significant association between L1 expression and classification of neuroendocrine tumors of the pancreas (P<0.01). CONCLUSION: L1 is specifically expressed in poorly-differentiated pancreatic neuroendocrine carcinomas that are known to have the worst prognosis. L1 might be a marker for risk prediction of patients diagnosed with pancreatic neuroendocrine carcinomas.

Kaifi, Jussuf T; Zinnkann, Ulrich; Yekebas, Emre F; Schurr, Paulus G; Reichelt, Uta; Wachowiak, Robin; Fiegel, Henning C; Petri, Susann; Schachner, Melitta; Izbicki, Jakob R

2006-01-01

276

Differential molecular profiling between skin carcinomas reveals four newly reported genes potentially implicated in squamous cell carcinoma development  

Microsoft Academic Search

Basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are skin tumors with different invasive potential. In this work, we analysed mRNA differential expression between seven BCC and five SCC and their normal skin counterparts using 1176 cDNA macroarrays and verification by RT–PCR to identify genes modulated in each tumor type. We identified 37 genes commonly modulated in both tumors

Claire Marionnet; Claude Lalou; Karine Mollier; Marjorie Chazal; Gisele Delestaing; Delphine Compan; Olivier Verola; Catherine Vilmer; Jerome Cuminet; Louis Dubertret; Nicole Basset-Séguin

2003-01-01

277

Polar agents with differentiation inducing capacity potentiate tumor necrosis factor-mediated cytotoxicity in human myeloid cell lines  

Microsoft Academic Search

Cotreatment or pretreatment of several hu- man myeloid cell lines (KG!, HL6O, U937, THP1) with the differentiation inducer DMSO was found to potenti- ate the antiproliferative and cytotoxic effects of TNF. In addition, TNF-resistant monocytic cell lines could be sen- sitized to TNF cytotoxicity by DMSO treatment. Other highly polar molecules, known to be potent differentia- tion inducers, showed similar

Stany Depraetere; Bart Vanhaesebroeckt; Walter Fierst; Jean Willems; Marcel Joniau

278

Electroosmotic Flow in Rectangular Nanochannels with Variable Wall potential: Generation of Multiple Nano-Vortices  

Microsoft Academic Search

Electroosmotic flow in nanochannels is characterized by a very small Reynolds number so that mixing is difficult. While several researchers have presented results for the case of periodic wall potential, and for a sudden change in potential there has been no systematic study of the effect of the variation of wall potential on the flow structure. We have calculated the

Lei Chen

2005-01-01

279

Potential Sources of Differential Item Functioning in the Adaptation of Tests  

ERIC Educational Resources Information Center

This report shows a classification of differential item functioning (DIF) sources that have an effect on the adaptation of tests. This classification is based on linguistic and cultural criteria. Four general DIF sources are distinguished: cultural relevance, translation problems, morph syntactical differences, and semantic differences. The…

Elosua, Paula; Lopez-Jauregui, Alicia

2007-01-01

280

A New Human Somatic Stem Cell from Placental Cord Blood with Intrinsic Pluripotent Differentiation Potential  

Microsoft Academic Search

Here a new, intrinsically pluripotent, CD45-negative population from human cord blood, termed unrestricted somatic stem cells (USSCs) is described. This rare population grows adher- ently and can be expanded to 10 15 cells without losing pluripotency. In vitro USSCs showed homogeneous differentiation into osteoblasts, chondroblasts, adipocytes, and hematopoietic and neural cells including astrocytes and neurons that express neurofilament, sodium channel

Gesine Kögler; Sandra Sensken; Judith A. Airey; Thorsten Trapp; Markus Müschen; Niklas Feldhahn; Stefanie Liedtke; Rüdiger V. Sorg; Johannes Fischer; Claudia Rosenbaum; Susanne Greschat; Andreas Knipper; Jörg Bender; Özer Degistirici; Jizong Gao; Arnold I. Caplan; Evan J. Colletti; Graça Almeida-Porada; Hans W. Müller; Esmail Zanjani; Peter Wernet

2004-01-01

281

Multiple nicotine training doses in mice as a basis for differentiating the effects of smoking cessation aids  

PubMed Central

Rationale Receptor mechanisms underlying the behavioral effects of clinically used nicotinic acetylcholine receptor agonists have not been fully established. Objective Drug discrimination was used to compare receptor mechanisms underlying the effects of smoking cessation aids. Methods Separate groups of male C57BL/6J mice discriminated 0.56, 1, or 1.78 mg/kg of nicotine base. Nicotine, varenicline, and cytisine were administered alone, in combination with each other, and in combination with mecamylamine and dihydro-?-erythroidine (DH?E). Midazolam and morphine were tested to examine sensitivity to non-nicotinics. Results The ED50 value of nicotine to produce discriminative stimulus effects systematically increased as training dose increased. Varenicline and cytisine did not fully substitute for nicotine and, as compared with nicotine, their ED50 values varied less systematically as a function of nicotine training dose. Morphine did not substitute for nicotine, whereas midazolam substituted for the low and not the higher training doses of nicotine. As training dose increased, the dose of mecamylamine needed to produce a significant rightward shift in the nicotine dose-effect function also increased. DH?E antagonized nicotine in animals discriminating the smallest dose of nicotine. Varenicline did not antagonize the effects of nicotine, whereas cytisine produced a modest though significant antagonism of nicotine. Conclusions These results suggest that differences in pharmacologic mechanism between nicotine, varenicline, and cytisine include not only differences in efficacy at a common subtype of nicotinic acetylcholine receptor, but also differential affinity and/or efficacy at multiple receptor subtypes.

Cunningham, Colin S.; McMahon, Lance R.

2013-01-01

282

Retinoic Acids Potentiate BMP9-Induced Osteogenic Differentiation of Mesenchymal Progenitor Cells  

PubMed Central

Background As one of the least studied bone morphogenetic proteins (BMPs), BMP9 is one of the most osteogenic BMPs. Retinoic acid (RA) signaling is known to play an important role in development, differentiation and bone metabolism. In this study, we investigate the effect of RA signaling on BMP9-induced osteogenic differentiation of mesenchymal progenitor cells (MPCs). Methodology/Principal Findings Both primary MPCs and MPC line are used for BMP9 and RA stimulation. Recombinant adenoviruses are used to deliver BMP9, RAR? and RXR? into MPCs. The in vitro osteogenic differentiation is monitored by determining the early and late osteogenic markers and matrix mineralization. Mouse perinatal limb explants and in vivo MPC implantation experiments are carried out to assess bone formation. We find that both 9CRA and ATRA effectively induce early osteogenic marker, such as alkaline phosphatase (ALP), and late osteogenic markers, such as osteopontin (OPN) and osteocalcin (OC). BMP9-induced osteogenic differentiation and mineralization is synergistically enhanced by 9CRA and ATRA in vitro. 9CRA and ATRA are shown to induce BMP9 expression and activate BMPR Smad-mediated transcription activity. Using mouse perinatal limb explants, we find that BMP9 and RAs act together to promote the expansion of hypertrophic chondrocyte zone at growth plate. Progenitor cell implantation studies reveal that co-expression of BMP9 and RXR? or RAR? significantly increases trabecular bone and osteoid matrix formation. Conclusion/Significance Our results strongly suggest that retinoid signaling may synergize with BMP9 activity in promoting osteogenic differentiation of MPCs. This knowledge should expand our understanding about how BMP9 cross-talks with other signaling pathways. Furthermore, a combination of BMP9 and retinoic acid (or its agonists) may be explored as effective bone regeneration therapeutics to treat large segmental bony defects, non-union fracture, and/or osteoporotic fracture.

Zhang, Wenli; Deng, Zhong-Liang; Chen, Liang; Zuo, Guo-Wei; Luo, Qing; Shi, Qiong; Zhang, Bing-Qiang; Wagner, Eric R.; Rastegar, Farbod; Kim, Stephanie H.; Jiang, Wei; Shen, Jikun; Huang, Enyi; Gao, Yanhong; Gao, Jian-Li; Zhou, Jian-Zhong; Luo, Jinyong; Huang, Jiayi; Luo, Xiaoji; Bi, Yang; Su, Yuxi; Yang, Ke; Liu, Hao; Luu, Hue H.; Haydon, Rex C.; He, Tong-Chuan; He, Bai-Cheng

2010-01-01

283

Single-cell clones of liver cancer stem cells have the potential of differentiating into different types of tumor cells  

PubMed Central

Cancer stem cells (CSCs) are believed to be a promising target for cancer therapy because these cells are responsible for tumor development, maintenance and chemotherapy resistance. Finding out the critical factors regulating CSC fate is the key for target therapy of CSCs. Just as normal stem cells are regulated by their microenvironment (niche), CSCs are also regulated by cells in the tumor microenvironment. However, whether various tumor microenvironments can induce CSCs to differentiate into different cancer cells is not clear. Here, we show that single-cell-cloned CSCs, accidentally obtained from a human liver cancer microvascular endothelial cells, express classic stem cell markers, genes associated with self-renewal and pluripotent factors and possess colony-forming ability in vitro and the ability of serial transplantation in vivo. The single-cell-cloned CSCs treated with the different tumor cell/tissue-derived conditioned culture medium, which is a mimic of carcinoma microenvironment, could differentiate into corresponding tumor cells and express specific markers of the respective type of tumor cells at the gene, protein and cell levels, respectively. Interestingly, this multilineage differentiation potential of single-cell-cloned liver CSCs sharply declined after the specific knockdown of octamer-binding transcription factor 4 (Oct4) alone, even though they were under the same induction conditions (carcinoma microenvironments). These data support the hypothesis that single-cell-cloned liver CSCs have the potential of differentiating into different types of tumor cells, and the tumor microenvironment does play a crucial role in deciding differentiation directions. Simultaneously, Oct4 in CSCs is indispensable in this process. These factors are promising targets for liver CSC-specific therapy.

Liu, H; Zhang, W; Jia, Y; Yu, Q; Grau, G E; Peng, L; Ran, Y; Yang, Z; Deng, H; Lou, J

2013-01-01

284

Videourodynamic and sphincter motor unit potential analyses in Parkinson's disease and multiple system atrophy  

Microsoft Academic Search

OBJECTIVESUrinary dysfunction is a prominent autonomic feature in Parkinson's disease (PD) and multiple system atrophy (MSA), which is not only troublesome but also a cause of morbidity in these disorders. Recent advances in investigative uroneurology offer a better insight into the underlying pathophysiology and appropriate management for urinary dysfunction.METHODStwenty one patients with PD (15 men, six women, mean age 64

R Sakakibara; T Hattori; T Uchiyama; T Yamanishi

2001-01-01

285

Targeting leukocyte MMPs and transmigration: Minocycline as a potential therapy for multiple sclerosis  

Microsoft Academic Search

Summary Multiple sclerosis is characterized by the infiltration of leukocytes into the CNS. As matrix metalloproteinases (MMPs) facilitate the passage of leukocytes across mat- rix barriers, we tested the hypothesis that targeting MMPs could attenuate neuro-inflammation. We report that minocycline, a widely used generic drug with a good safety record, inhibited MMP activity, reduced production of MMP-9 and decreased the

Veronika Brundula; N. Barry Rewcastle; Luanne M. Metz; Claude C. Bernard; V. Wee Yong

2002-01-01

286

Pomalidomide and its clinical potential for relapsed or refractory multiple myeloma: an update for the hematologist  

PubMed Central

Multiple myeloma is a common plasma cell neoplasm that is incurable with conventional therapy. The treatment paradigm of multiple myeloma is not standardized and is evolving. The advent of novel drugs, including the proteasome inhibitor bortezomib and the immunomodulatory agents, has resulted in increased median survival. Unfortunately, all patients eventually relapse and require further therapy. Pomalidomide is the newest immunomodulatory drug, created by chemical modification of thalidomide with the intention of increasing therapeutic activity while limiting toxicity. Its mechanism of action is incompletely understood but involves anti-angiogenic effects, immunomodulation, an effect on the myeloma tumor microenvironment, and the protein cereblon. It is more potent than thalidomide and lenalidomide. In phase II studies, it has shown significant activity in patients with relapsed and refractory multiple myeloma, including patients who are heavily pretreated, have disease refractory to lenalidomide and bortezomib, and those with high-risk cytogenetic or molecular markers. It is generally well tolerated, with adverse effects including fatigue, neutropenia, neuropathy, and thromboembolic disease. Pomalidomide is a promising new agent in the expanding arsenal of antimyeloma drugs. In this review, we discuss the clinical experience to date with pomalidomide in multiple myeloma.

Lacy, Martha Q.

2013-01-01

287

Capacity to make medical treatment decisions in multiple sclerosis: A potentially remediable deficit  

Microsoft Academic Search

Ability to make decisions about medical treatment is compromised in significant numbers of people with neurological and psychiatric illness, and this incapacity frequently corresponds with compromised neuropsychological function. Although cognitive deficits occur often in people with multiple sclerosis (MS), no research has studied decisional capacity in that disease. The present investigation examined ability to understand treatment disclosures, which is a

Michael R. Basso; Philip J. Candilis; Jay Johnson; Courtney Ghormley; Dennis R. Combs; Taeh Ward

2010-01-01

288

Differential Expression of Multiple Genes in Association with MADH4/DPC4/SMAD4 Inactivation in Pancreatic Cancer  

PubMed Central

The Gene Logic Inc. Gene Express® tools and Affymetrix GeneChip® arrays were utilized to discover genes differentially expressed in pancreatic cancers with MADH4/DPC4/SMAD4 gene inactivation. cDNA was prepared from thirteen pancreas cancer cell lines with known MADH4 status (5 with wild-type MADH4 and 8 with inactivated MADH4) and hybridized to the complete Affymetrix Human Genome U133 GeneChip® set (arrays U133 A,B) for simultaneous analysis of 45,000 gene fragments corresponding to 33,000 known genes. 25 known genes were identified as down-regulated at least three fold in the MADH4 mutant cancer cell lines. 9 were decreased in expression at least 5 fold, and 1 in particular (ID3) was decreased 23 fold. Only 2 of the 25 down-regulated genes (ID1 and ID3) have been previously reported as MADH4-dependent targets, and the remaining 23 genes represent potential novel direct or indirect MADH4 downstream targets. Immunolabeling for Id1 and Id3 did not show a relationship with known MADH4 status in pancreatic cancer tissues, suggesting additional regulation of these two genes than activation by MadH4. Further investigations to validate and to determine the significance of these candidate target genes in pancreatic carcinogenesis and progression are warranted.

Cao, Dengfeng; Ashfaq, Raheela; Goggins, Michael G.; Hruban, Ralph H.; Kern, Scott E.; Iacobuzio-Donahue, Christine A.

2008-01-01

289

Molecular mechanisms and potentials for differentiating inner ear stem cells into sensory hair cells.  

PubMed

In mammals, hair cells may be damaged or lost due to genetic mutation, infectious disease, chemical ototoxicity, noise and other factors, causing permanent sensorineural deafness. Regeneration of hair cells is a basic pre-requisite for recovery of hearing in deaf animals. The inner ear stem cells in the organ of Corti and vestibular utricle are the most ideal precursors for regeneration of inner ear hair cells. This review highlights some recent findings concerning the proliferation and differentiation of inner ear stem cells. The differentiation of inner ear stem cells into hair cells involves a series of signaling pathways and regulatory factors. This paper offers a comprehensive analysis of the related studies. PMID:24680894

Liu, Quanwen; Chen, Ping; Wang, Jinfu

2014-06-15

290

The Zinc Finger Transcription Factor Egr1 Potentiates Macrophage Differentiation of Hematopoietic Cells  

Microsoft Academic Search

Previously we have shown that the zinc finger transcription factor Egr-1 is essential for and restricts differentiation of hematopoietic cells along the macrophage lineage, raising the possibility thatEgr-1 actually plays a deterministic role in governing the development of hematopoietic precursor cells along the monocytic lineage. To test this hypothesis, we have taken advantage of interleukin-3-dependent 32Dcl3 hematopoietic precursor cells which,

KANDASAMY KRISHNARAJU; HUNG Q. NGUYEN; DAN A. LIEBERMANN

1995-01-01

291

Pregnancy after high therapeutic doses of iodine-131 in differentiated thyroid cancer: potential risks and recommendations  

Microsoft Academic Search

Seventy female patients who had been treated with high doses of iodine-131 for differentiated thyroid cancer (DTC) and who had a subsequent pregnancy were evaluated. The total 131I dose ranged from 1.85 to 16.55 GBq (mean±SD=4.39±25.20 GBq). Age at first therapy ranged from 15 to 36 years (mean±SD = 24.3±5.0 years) and the interval from 131I therapy topregnancy varied from

Dario Casara; Domenico Rubello; Giorgio Saladini; Andrea Piotto; Maria Rosa Peiizzo; Maria Elisa Girelli; Benedetto Busnardo

1993-01-01

292

Iron chelator induces THP1 cell differentiation potentially by modulating intracellular glutathione levels  

Microsoft Academic Search

Iron chelators have been implicated to modulate certain inflammatory mediators and regulate inflammatory processes. Here we report that iron chelator deferoxamine (DFO) induces differentiation of monocytic THP-1 cells into functional macrophages. DFO rapidly phosphorylated both extracellular signal-regulated kinase (ERK) and p38 kinase. Blockade of ERK signaling by the MEK1\\/2 inhibitor PD098059 abolished DFO-induced class A scavenger receptor (SR-A) expression and

Geom-Seog Seo; Sung-Hee Lee; Suck-Chei Choi; Eun-Young Choi; Hyun-Mee Oh; Eun-Ju Choi; Do-Sim Park; Sang-Wook Kim; Tae-Hyeon Kim; Yong-Ho Nah; Soonhag Kim; Sang-Hyun Kim; Sun-Hae You; Chang-Duk Jun

2006-01-01

293

Potential triggers of akinete differentiation in Nodularia spumigena (Cyanobacteriaceae) isolated from Australia  

Microsoft Academic Search

Nodularia spumigena, like many cyanobacteria, produces specialised reproductive structures, known as akinetes, which are believed to allow survival\\u000a under unfavourable conditions. This study investigated the effects of salinity, nitrogen and phosphorus concentration at two\\u000a irradiances on akinete differentiation in a N. spumigena isolate from the Gippsland Lakes, Victoria, Australia. A computer image analysis program was used to photograph filaments\\u000a and

Jackie H. Myers; John Beardall; Graeme Allinson; Scott Salzman; Simon Robertson; Leanne Gunthorpe

2011-01-01

294

Adiponectin and leptin: Potential tools in the differential diagnosis of pediatric diabetes?  

Microsoft Academic Search

The incidence of type 1 and type 2 diabetes mellitus in the pediatric population has increased over the past decade. The practitioner\\u000a is often faced with the challenge of differentiating between type 1 and type 2 diabetes at the time of initial diagnosis because\\u000a of the overlap of clinical and laboratory characteristics between these two entities. Adipokines are proteins secreted

Milagros Gloria Huerta

2006-01-01

295

Sir2 Regulates Skeletal Muscle Differentiation as a Potential Sensor of the Redox State  

Microsoft Academic Search

Sir2 is a NAD+-dependent histone deacetylase that controls gene silencing, cell cycle, DNA damage repair, and life span. Prompted by the observation that the [NAD+]\\/[NADH] ratio is subjected to dynamic fluctuations in skeletal muscle, we have tested whether Sir2 regulates muscle gene expression and differentiation. Sir2 forms a complex with the acetyltransferase PCAF and MyoD and, when overexpressed, retards muscle

Marcella Fulco; R. Louis Schiltz; Simona Iezzi; M. Todd King; Po Zhao; Yoshihiro Kashiwaya; Eric Hoffman; Richard L. Veech; Vittorio Sartorelli

2003-01-01

296

Application potential of differential SAR interferometry in land subsidence spatial-temporal data capturing  

Microsoft Academic Search

Three Differential Synthetic Aperture Radar Interferometry (D-InSAR) methods are compared on the capability of obtaining land subsidence temporal data. These three methods including, Interferograms time-series stacking, Permanent Scatters D-InSAR(PS-InSAR) and Multi-Baseline D-InSAR are all base on interferometry phase spatial-temporal analysis to increase reliability. They are used to extract land subsidence mean velocity from time serial SAR images in nearly two

Zhaoquan Huang; Le Yu; Fan Wang

2009-01-01

297

A reassessment of sensory evoked potential parameters in multiple sclerosis: a discriminant analysis approach.  

PubMed Central

The sensitivity of the different parameters (absolute latency, interwave latency, latency asymmetry, amplitude) of both cervical and cerebral responses evoked by stimulation of the median nerve at the wrist was assessed in patients with multiple sclerosis by discriminant analysis. The peak latency of N13 or N20 SEP components or both was found to be more sensitive than their amplitude, provided that a preliminary covariation with the height of the subjects was performed. The measurement of latency asymmetry between the two sides increased the test's sensitivity, while amplitude asymmetry turned out to be of little diagnostic value. A linear discriminant function with four variates (that is mean amplitude, mean latency, latency asymmetry and height of the subject) was computed to summarise the information provided by the different parameters to give a rapid and exact method for the assessment of SEP abnormalities in multiple sclerosis patients.

Abbruzzese, G; Cocito, L; Ratto, S; Abbruzzese, M; Leandri, M; Favale, E

1981-01-01

298

Interatomic potentials for PuC by Chen-Möbius multiple lattice inversion  

NASA Astrophysics Data System (ADS)

The atomic interactions of PuC with B1 structure were described by Chen-Möbius lattice inversion combined with first-principle calculations. In order to obtain the inversion potential parameters of PuC, three different structures including two virtual crystals were built and the Morse function plus a modified term was adopted to fit the pair-potential curves. The reliability of the inversion potential was tested by checking the stability of the transition of PuC from disordered to ordered state and comparing the calculated and experimental physical and thermal properties of PuC. All the results show that the inversion potential could give a stable and accurate description of the atomic interactions in PuC and the physical and thermal properties of PuC are well reproduced by the potential.

Huang, H.; Meng, D. Q.; Lai, X. C.; Li, G.; Long, Y.

2013-11-01

299

Oxidative Stress in Multiple Sclerosis Pathology and Therapeutic Potential of Nrf2 Activation  

Microsoft Academic Search

\\u000a Reactive oxygen species contribute to the formation and persistence of multiple sclerosis (MS) lesions by acting on distinct\\u000a pathological processes. To counteract the detrimental effects of reactive oxygen species, the central nervous system is endowed\\u000a with a protective mechanism consisting of enzymatic and nonenzymatic antioxidants. Expression of most antioxidant enzymes\\u000a is regulated through the transcription factor nuclear factor-E2-related factor (Nrf2),

Helga E. de Vries; Gerty Schreibelt; Jack van Horssen

300

UNAIDS 'multiple sexual partners' core indicator: promoting sexual networks to reduce potential biases  

PubMed Central

UNAIDS proposed a set of core indicators for monitoring changes in the worldwide AIDS epidemic. This paper explores the validity and effectiveness of the ‘multiple sexual partners’ core indicator, which is only partially captured with current available data. The paper also suggests an innovative approach for collecting more informative data that can be used to provide an accurate measure of the UNAIDS’s ‘multiple sexual partners’ core indicator. Specifically, the paper addresses three major limitations associated with the indicator when it is measured with respondents’ sexual behaviors. First, the indicator assumes that a person’s risk of contracting HIV/AIDS/STIs is merely a function of his/her own sexual behavior. Second, the indicator does not account for a partner’s sexual history, which is very important in assessing an individual’s risk level. Finally, the 12-month period used to define a person’s risks can be misleading, especially because HIV/AIDS theoretically has a period of latency longer than a year. The paper concludes that, programmatically, improvements in data collection are a top priority for reducing the observed bias in the ‘multiple sexual partners’ core indicator.

Dimbuene, Zacharie Tsala; Emina, Jacques B.O.; Sankoh, Osman

2014-01-01

301

A long-term culture of human hepatocytes which show a high growth potential and express their differentiated phenotypes.  

PubMed

The present study succeeded for the first time in cultivating for more than 2 months human normal hepatocytes which showed a high growth potential and expressed their differentiated phenotypes. Constituents of culture medium were critical for this culture, and the medium optimized for their growth contained fresh human serum, fetal bovine serum, Swiss 3T3-cell conditioned medium, L-ascorbic acid 2-phosphate, epidermal growth factor, nicotinamide, and dimethyl sulfoxide. Hepatocytes steadily replicated and formed colonies which continued to increase in size up to around 35 days. The number of hepatocytes in the most replicative colonies increased 17-fold during 31 days. Cells in colonies expressed normal differentiated hepatocytic phenotypes for as long as 35 days. These hepatocytes retained normal liver functions at least for 70 days such as to secrete albumin, and to metabolize lidocaine and D-galactose. PMID:10066444

Hino, H; Tateno, C; Sato, H; Yamasaki, C; Katayama, S; Kohashi, T; Aratani, A; Asahara, T; Dohi, K; Yoshizato, K

1999-03-01

302

Potential therapeutic applications of differentiated induced pluripotent stem cells (iPSCs) in the treatment of neurodegenerative diseases.  

PubMed

Difficulties in realizing persistent neurogenesis, inabilities in modeling pathogenesis of most cases, and a shortage of disease material for screening therapeutic agents restrict our progress to overcome challenges presented by neurodegenerative diseases. We propose that reprogramming primary somatic cells of patients into induced pluripotent stem cells (iPSCs) provides a new avenue to overcome these impediments. Their abilities in self-renewal and differentiation into various cell types will enable disease investigation and drug development. In this review, we introduce efficient approaches to generate iPSCs and distinct iPSCs differentiation stages, and critically discuss paradigms of iPSCs technology application to investigate neurodegenerative diseases such as Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD). Although iPSCs technology is in its infancy and faces many obstacles, it has great potential in helping to identify therapeutic targets for treating neurodegenerative diseases. PMID:23069758

Gao, Aijing; Peng, Yuhua; Deng, Yulin; Qing, Hong

2013-01-01

303

New emerging potentials for human Wharton's jelly mesenchymal stem cells: immunological features and hepatocyte-like differentiative capacity.  

PubMed

In recent years, human mesenchymal stem cells (MSC) have been extensively studied. Their key characteristics of long-term self-renewal and a capacity to differentiate into diverse mature tissues favor their use in regenerative medicine applications. Stem cells can be found in embryonic and extraembryonic tissues as well as in adult organs. Several reports indicate that cells of Wharton's jelly (WJ), the main component of umbilical cord extracellular matrix, are multipotent stem cells, expressing markers of bone marrow mesenchymal stem cells (BM-MSC), and giving rise to different cellular types of both connective and nervous tissues. Wharton's jelly mesenchymal stem cells (WJ-MSC) express markers previously characterized in embryonic stem cells (ESC), such as Nanog and Oct3/4A. WJ-MSC further emerge as promising hypoimmunogenic cells, due to the expression of molecules able to modulate NK cells and expand regulatory T-cell populations. Moreover, it is now accepted that the differentiative capacities of such cells span all the mesoderm-derived tissues, extending to neuroectodermal as well as endodermal lineages. In this review, we compare very recent data on the potential of WJ-MSC to undergo hepatocyte-like differentiation with the results obtained from other adult MSC populations. Data in the literature strongly suggest that WJ-MSC can differentiate into diverse cell types, showing a unique ability to cross lineage borders. This, together with their in vitro proliferative potential and their immunoregulatory features, renders these cells extremely promising for regenerative medicine applications in different pathological settings. PMID:19958166

Anzalone, Rita; Lo Iacono, Melania; Corrao, Simona; Magno, Francesca; Loria, Tiziana; Cappello, Francesco; Zummo, Giovanni; Farina, Felicia; La Rocca, Giampiero

2010-04-01

304

Molecular analysis of the differentiation potential of murine mesenchymal stem cells from tissues of endodermal or mesodermal origin.  

PubMed

Mesenchymal stem cells (MSCs) have received great attention due to their remarkable regenerative, angiogenic, antiapoptotic, and immunosuppressive properties. Although conventionally isolated from the bone marrow, they are known to exist in all tissues and organs, raising the question on whether they are identical cell populations or have important differences at the molecular level. To better understand the relationship between MSCs residing in different tissues, we analyzed the expression of genes related to pluripotency (SOX2 and OCT-4) and to adipogenic (C/EBP and ADIPOR1), osteogenic (OMD and ALP), and chondrogenic (COL10A1 and TRPV4) differentiation in cultures derived from murine endodermal (lung) and mesodermal (adipose) tissue maintained in different conditions. MSCs were isolated from lungs (L-MSCs) and inguinal adipose tissue (A-MSCs) and cultured in normal conditions, in overconfluence or in inductive medium for osteogenic, adipogenic, or chondrogenic differentiation. Cultures were characterized for morphology, immunophenotype, and by quantitative real-time reverse transcription-polymerase chain reaction for expression of pluripotency genes or markers of differentiation. Bone marrow-derived MSCs were also analyzed for comparison of these parameters. L-MSCs and A-MSCs exhibited the typical morphology, immunophenotype, and proliferation and differentiation pattern of MSCs. The analysis of gene expression showed a higher potential of adipose tissue-derived MSCs toward the osteogenic pathway and of lung-derived MSCs to chondrogenic differentiation, representing an important contribution for the definition of the type of cell to be used in clinical trials of cell therapy and tissue engineering. PMID:21970410

Nora, Claudia Concer Viero; Camassola, Melissa; Bellagamba, Bruno; Ikuta, Nilo; Christoff, Ana Paula; Meirelles, Lindolfo da Silva; Ayres, Raquel; Margis, Rogério; Nardi, Nance Beyer

2012-07-01

305

Swine Cone and Rod Precursors Arise Sequentially and Display Sequential and Transient Integration and Differentiation Potential Following Transplantation  

PubMed Central

Purpose. We followed cone and rod development in the pig and we correlated development with the potential for cone and rod precursor integration and differentiation following subretinal transplantation. Methods. Rod and cone precursors were identified during development by their position in the outer retina and by immunostaining for markers of differentiation. Embryonic retinal cells from green fluorescent protein (GFP)+ transgenic pigs at different developmental stages were transplanted into adult retinas and integration and differentiation was followed and quantified by immunostaining for markers of cone and rod differentiation. Results. Pig cones and rods are spatially segregated, allowing us to follow rod and cone development in situ. Gestation in the pig is 114 days. By embryonic day (E) 50, postmitotic cone progenitors had formed the outer two rows of the retina. These cone progenitors are marked by expression of Islet1 (ISL1) and Recoverin (RCVRN) (at this embryonic stage, RCVRN exclusively marks these cone precursors). By contrast, postmitotic neural retina leucine zipper (NRL)+ rod precursors, located interior to the cone precursors, did not appear until E65. At E50, before NRL+ rod precursors are evident, transplanted cells gave rise almost exclusively to cones. At, E57, transplanted cells gave rise to equal numbers of rods and cones, but by E65, transplanted cells gave rise almost exclusively to rods. Transplantation of cells at E85 or E105, as precursors initiate opsin expression, led to few integrated cells. Conclusions. Consistent with their sequential appearances in embryonic retina, these results demonstrate sequential and surprisingly narrow developmental windows for integration/differentiation of cone and rod precursors following transplantation.

Wang, Wei; Zhou, Liang; Lee, Sang Joon; Liu, Yongqing; Fernandez de Castro, Juan; Emery, Douglas; Vukmanic, Eric; Kaplan, Henry J.; Dean, Douglas C.

2014-01-01

306

The Potential of Water Vapor & Precipitation Estimation with a Differential-frequency Radar  

NASA Technical Reports Server (NTRS)

In the presence of rain, the radar return powers from a three-frequency radar, with center frequency at 22.235 GHz and upper and lower frequencies chosen with equal water vapor absorption coefficients, can be used to estimate water vapor density and parameters of the precipitation. A linear combination of differential measurements between the center and lower frequencies on one hand and the upper and lower frequencies on the other provide an estimate of differential water vapor absorption. Conversely, the difference in radar reflectivity factors (in dB) between the upper and lower frequencies is independent of water vapor absorption and can be used to estimate the median mass diameter of the hydrometeors. For a down-looking radar, path-integrated estimates of water vapor absorption may be possible under rain-free as well as raining conditions by using the surface returns at the three frequencies. Cross-talk or interference between the precipitation and water vapor estimates depends on the frequency separation of the channels as well as on the phase state and the median mass diameter of the hydrometeors. Simulations of the retrieval of water vapor absorption show that the largest source of variability arises from the variance in the measured radar return powers while the largest biases occur in the mixed-phase region. Use of high pulse repetition frequencies and signal whitening methods may be needed to obtain the large number of independent samples required. Measurements over a fractional bandwidth, defined as the ratio of the difference between the upper and lower frequencies to the center frequency, up to about 0.2 should be passible in a differential frequency mode, where a single transceiver and antenna are used. Difficulties in frequency allocation may require alternative choices of frequency where the water vapor absorptions at the low and high frequencies are unequal. We consider the degradation in the retrieval accuracy when the frequencies are not optimum.

Meneghini, Robert; Liao, Liang; Tian, Lin

2006-01-01

307

Downregulation of H19 improves the differentiation potential of mouse parthenogenetic embryonic stem cells.  

PubMed

Parthenogenetic embryonic stem cells (P-ESCs) offer an alternative source of pluripotent cells, which hold great promise for autologous transplantation and regenerative medicine. P-ESCs have been successfully derived from blastocysts of several mammalian species. However, compared with biparental embryonic stem cells (B-ESCs), P-ESCs are limited in their ability to fully differentiate into all 3 germ layers. For example, it has been observed that there is a differentiation bias toward ectoderm derivatives at the expense of endoderm and mesoderm derivatives-muscle in particular-in chimeric embryos, teratomas, and embryoid bodies. In the present study we found that H19 expression was highly upregulated in P-ESCs with more than 6-fold overexpression compared with B-ESCs. Thus, we hypothesized that manipulation of the H19 gene in P-ESCs would alleviate their limitations and allow them to function like B-ESCs. To test this hypothesis we employed a small hairpin RNA approach to reduce the amount of H19 transcripts in mouse P-ESCs. We found that downregulation of H19 led to an increase of mesoderm-derived muscle and endoderm in P-ESCs teratomas similar to that observed in B-ESCs teratomas. This phenomenon coincided with upregulation of mesoderm-specific genes such as Myf5, Myf6, and MyoD. Moreover, H19 downregulated P-ESCs differentiated into a higher percentage of beating cardiomyocytes compared with control P-ESCs. Collectively, these results suggest that P-ESCs are amenable to molecular modifications that bring them functionally closer to true ESCs. PMID:21793658

Ragina, Neli P; Schlosser, Karianne; Knott, Jason G; Senagore, Patricia K; Swiatek, Pamela J; Chang, Eun Ah; Fakhouri, Walid D; Schutte, Brian C; Kiupel, Matti; Cibelli, Jose B

2012-05-01

308

Investigation of potential of differential absorption Lidar techniques for remote sensing of atmospheric pollutants  

NASA Technical Reports Server (NTRS)

The NASA multipurpose differential absorption lidar (DIAL) system uses two high conversion efficiency dye lasers which are optically pumped by two frequency-doubled Nd:YAG lasers mounted rigidly on a supporting structure that also contains the transmitter, receiver, and data system. The DIAL system hardware design and data acquisition system are described. Timing diagrams, logic diagrams, and schematics, and the theory of operation of the control electronics are presented. Success in obtaining remote measurements of ozone profiles with an airborne systems is reported and results are analyzed.

Butler, C. F.; Shipley, S. T.; Allen, R. J.

1981-01-01

309

Differential detection of potentially hazardous Fusarium species in wheat grains by an electronic nose.  

PubMed

Fungal infestation on wheat is an increasingly grave nutritional problem in many countries worldwide. Fusarium species are especially harmful pathogens due to their toxic metabolites. In this work we studied volatile compounds released by F. cerealis, F. graminearum, F. culmorum and F. redolens using SPME-GC/MS. By using an electronic nose we were able to differentiate between infected and non-infected wheat grains in the post-harvest chain. Our electronic nose was capable of distinguishing between four wheat Fusaria species with an accuracy higher than 80%. PMID:21695232

Eifler, Jakob; Martinelli, Eugenio; Santonico, Marco; Capuano, Rosamaria; Schild, Detlev; Di Natale, Corrado

2011-01-01

310

Differential Detection of Potentially Hazardous Fusarium Species in Wheat Grains by an Electronic Nose  

PubMed Central

Fungal infestation on wheat is an increasingly grave nutritional problem in many countries worldwide. Fusarium species are especially harmful pathogens due to their toxic metabolites. In this work we studied volatile compounds released by F. cerealis, F. graminearum, F. culmorum and F. redolens using SPME-GC/MS. By using an electronic nose we were able to differentiate between infected and non-infected wheat grains in the post-harvest chain. Our electronic nose was capable of distinguishing between four wheat Fusaria species with an accuracy higher than 80%.

Eifler, Jakob; Martinelli, Eugenio; Santonico, Marco; Capuano, Rosamaria; Schild, Detlev; Di Natale, Corrado

2011-01-01

311

Physicochemical Control of Adult Stem Cell Differentiation: Shedding Light on Potential Molecular Mechanisms.  

National Technical Information Service (NTIS)

Realization of the exciting potential for stem-cell-based biomedical and therapeutic applications, including tissue engineering, requires an understanding of the cell-cell and cell-environment interactions. To this end, recent efforts have been focused on...

I. Titushkin J. Shin M. Cho S. Sun

2010-01-01

312

X-ray induced alterations in the differentiation and mineralization potential of murine preosteoblastic cells  

NASA Astrophysics Data System (ADS)

To evaluate the effects of ionizing radiation (IR) on murine preosteoblastic cell differentiation, we directed OCT-1 cells to the osteoblastic lineage by treatment with a combination of ?-glycerophosphate (?-GP), ascorbic acid (AA), and dexamethasone (Dex). In vitro mineralization was evaluated based on histochemical staining and quantification of the hydroxyapatite content of the extracellular bone matrix. Expression of mRNA encoding Runx2, transforming growth factor ?1 (TGF-?1), osteocalcin (OCN), and p21CDKN1A was analyzed. Exposure to IR reduced the growth rate and diminished cell survival of OCT-1 cells under standard conditions. Notably, calcium content analysis revealed that deposition of mineralized matrix increased significantly under osteogenic conditions after X-ray exposure in a time-dependent manner. In this study, higher radiation doses exert significant overall effects on TGF-?1, OCN, and p21CDKN1A gene expression, suggesting that gene expression following X-ray treatment is affected in a dose-dependent manner. Additionally, we verified that Runx2 was suppressed within 24 h after irradiation at 2 and 4 Gy. Although further studies are required to verify the molecular mechanism, our observations strongly suggest that treatment with IR markedly alters the differentiation and mineralization process of preosteoblastic cells.

Hu, Yueyuan; Lau, Patrick; Baumstark-Khan, Christa; Hellweg, Christine E.; Reitz, Günther

2012-05-01

313

The inhibitory receptor LILRB1 modulates the differentiation and regulatory potential of human dendritic cells.  

PubMed

Dendritic cells (DCs) link innate and adaptive immunity, initiating and regulating effector cell responses. They ubiquitously express members of the LILR (ILT, LIR, CD85) family of molecules, some of which recognize self-HLA molecules, but little is known of their possible functions in DC biology. We demonstrate that the inhibitory receptor LILRB1 (ILT2, LIR1, CD85j) is selectively up-regulated during DC differentiation from monocyte precursors in culture. Continuous ligation of LILRB1 modulated cellular differentiation, conferred a unique phenotype upon the resultant cells, induced a profound resistance to CD95-mediated cell death, and inhibited secretion of cytokines IL-10, IL-12p70, and TGF-beta. These features remained stable even after exposure of the cells to bacterial LPS. Ligated DCs exhibited poor stimulatory activity for primary and memory T-cell proliferative responses, but this was substantially reversed by blockade of CD80 or its preferred ligand CTLA-4, or by depleting CD4(+) CD25(+) CD127(lo) regulatory T cells. Our findings suggest that ligation of LILRB1 on DCs by self-HLA molecules may play a key role in controlling the balance between the induction and suppression of adaptive immune responses. PMID:18094328

Young, Neil T; Waller, Edward C P; Patel, Rashmi; Roghanian, Ali; Austyn, Jonathan M; Trowsdale, John

2008-03-15

314

A New Human Somatic Stem Cell from Placental Cord Blood with Intrinsic Pluripotent Differentiation Potential  

PubMed Central

Here a new, intrinsically pluripotent, CD45-negative population from human cord blood, termed unrestricted somatic stem cells (USSCs) is described. This rare population grows adherently and can be expanded to 1015 cells without losing pluripotency. In vitro USSCs showed homogeneous differentiation into osteoblasts, chondroblasts, adipocytes, and hematopoietic and neural cells including astrocytes and neurons that express neurofilament, sodium channel protein, and various neurotransmitter phenotypes. Stereotactic implantation of USSCs into intact adult rat brain revealed that human Tau-positive cells persisted for up to 3 mo and showed migratory activity and a typical neuron-like morphology. In vivo differentiation of USSCs along mesodermal and endodermal pathways was demonstrated in animal models. Bony reconstitution was observed after transplantation of USSC-loaded calcium phosphate cylinders in nude rat femurs. Chondrogenesis occurred after transplanting cell-loaded gelfoam sponges into nude mice. Transplantation of USSCs in a noninjury model, the preimmune fetal sheep, resulted in up to 5% human hematopoietic engraftment. More than 20% albumin-producing human parenchymal hepatic cells with absence of cell fusion and substantial numbers of human cardiomyocytes in both atria and ventricles of the sheep heart were detected many months after USSC transplantation. No tumor formation was observed in any of these animals.

Kogler, Gesine; Sensken, Sandra; Airey, Judith A.; Trapp, Thorsten; Muschen, Markus; Feldhahn, Niklas; Liedtke, Stefanie; Sorg, Rudiger V.; Fischer, Johannes; Rosenbaum, Claudia; Greschat, Susanne; Knipper, Andreas; Bender, Jorg; Degistirici, Ozer; Gao, Jizong; Caplan, Arnold I.; Colletti, Evan J.; Almeida-Porada, Graca; Muller, Hans W.; Zanjani, Esmail; Wernet, Peter

2004-01-01

315

Improving the quality of multifocal visual evoked potential results by calculating multiple virtual channels  

Microsoft Academic Search

Purpose  To introduce a method for improvement of multifocal VEP (mfVEP) recordings by prediction of waveforms at multiple positions\\u000a on the surface of the skull.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  Fifteen healthy participants (mean age 24 ± 3.8 years) underwent mfVEP recordings from 3 surface positions. Two methods of\\u000a a best-of-mfVEP approach were used and compared. In the first, a standard procedure, further data from 3 calculated channels were

Babac A. E. MazinaniTill; Till D. Waberski; Andreas W. A. Weinberger; Peter Walter; Gernot F. Roessler

316

Differential molecular profiling between skin carcinomas reveals four newly reported genes potentially implicated in squamous cell carcinoma development.  

PubMed

Basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are skin tumors with different invasive potential. In this work, we analysed mRNA differential expression between seven BCC and five SCC and their normal skin counterparts using 1176 cDNA macroarrays and verification by RT-PCR to identify genes modulated in each tumor type. We identified 37 genes commonly modulated in both tumors and four genes specifically modulated in SCC. Among these latter RhoC and EMMPRIN genes seem to be of particular interest and could participate in SCC aggressivity. PMID:12776202

Marionnet, Claire; Lalou, Claude; Mollier, Karine; Chazal, Marjorie; Delestaing, Gisele; Compan, Delphine; Verola, Olivier; Vilmer, Catherine; Cuminet, Jerome; Dubertret, Louis; Basset-Séguin, Nicole

2003-05-29

317

SUMOylation of ATRIP potentiates DNA damage signaling by boosting multiple protein interactions in the ATR pathway.  

PubMed

The ATR (ATM [ataxia telangiectasia-mutated]- and Rad3-related) checkpoint is a crucial DNA damage signaling pathway. While the ATR pathway is known to transmit DNA damage signals through the ATR-Chk1 kinase cascade, whether post-translational modifications other than phosphorylation are important for this pathway remains largely unknown. Here, we show that protein SUMOylation plays a key role in the ATR pathway. ATRIP, the regulatory partner of ATR, is modified by SUMO2/3 at K234 and K289. An ATRIP mutant lacking the SUMOylation sites fails to localize to DNA damage and support ATR activation efficiently. Surprisingly, the ATRIP SUMOylation mutant is compromised in the interaction with a protein group, rather than a single protein, in the ATR pathway. Multiple ATRIP-interacting proteins, including ATR, RPA70, TopBP1, and the MRE11-RAD50-NBS1 complex, exhibit reduced binding to the ATRIP SUMOylation mutant in cells and display affinity for SUMO2 chains in vitro, suggesting that they bind not only ATRIP but also SUMO. Fusion of a SUMO2 chain to the ATRIP SUMOylation mutant enhances its interaction with the protein group and partially suppresses its localization and functional defects, revealing that ATRIP SUMOylation promotes ATR activation by providing a unique type of protein glue that boosts multiple protein interactions along the ATR pathway. PMID:24990965

Wu, Ching-Shyi; Ouyang, Jian; Mori, Eiichiro; Nguyen, Hai Dang; Maréchal, Alexandre; Hallet, Alexander; Chen, David J; Zou, Lee

2014-07-01

318

Potential outcome measures and trial design issues for multiple system atrophy.  

PubMed

Multiple system atrophy (MSA) is a neurodegenerative disorder exhibiting a combination of parkinsonism, cerebellar ataxia, and autonomic failure. A disease-specific scale, the Unified Multiple System Atrophy Rating Scale (UMSARS), has been developed and validated to measure progression of MSA, but its use as an outcome measure for therapeutic trials has not been evaluated. On the basis of twelve months of follow-up from an observational study of 67 patients with probable MSA, we evaluated three disease-specific scores: Activities of Daily Living, Motor Examination, and a combined score from the UMSARS and two general health scores, the Physical Health and Mental Health scores of the SF-36 health survey, for their use as outcome measures in a therapeutic trial. We discuss related design issues and provide sample size estimates. Scores based on the disease-specific UMSARS seemed to be equal or superior to scores based on the SF-36 health survey. They appeared to capture disease progression, were well correlated and required the smallest sample size. The UMSARS Motor Examination score exhibited the most favorable characteristics as an outcome measure for a therapeutic trial in MSA with 1 year of follow-up. PMID:17914727

May, Susanne; Gilman, Sid; Sowell, B Brooke; Thomas, Ronald G; Stern, Matthew B; Colcher, Amy; Tanner, Caroline M; Huang, Neng; Novak, Peter; Reich, Stephen G; Jankovic, Joseph; Ondo, William G; Low, Phillip A; Sandroni, Paola; Lipp, Axel; Marshall, Frederick J; Wooten, Frederick; Shults, Clifford W

2007-12-01

319

Evoked response study tool: a portable, rugged system for single and multiple auditory evoked potential measurements.  

PubMed

Although the potential of using portable auditory evoked potential systems for field testing of stranded cetaceans has been long recognized, commercial systems for evoked potential measurements generally do not possess the bandwidth required for testing odontocete cetaceans and are not suitable for field use. As a result, there have been a number of efforts to develop portable evoked potential systems for field testing of cetaceans. This paper presents another such system, called the evoked response study tool (EVREST). EVREST is a Windows-based hardware/software system designed for calibrating sound stimuli and recording and analyzing transient and steady-state evoked potentials. The EVREST software features a graphical user interface, real-time analysis and visualization of recorded data, a variety of stimulus options, and a high level of automation. The system hardware is portable, rugged, battery-powered, and possesses a bandwidth that encompasses the audible range of echolocating odontocetes, making the system suitable for field testing of stranded or rehabilitating cetaceans. PMID:19603907

Finneran, James J

2009-07-01

320

Cell isolation induces fate changes of bone marrow mesenchymal cells leading to loss or alternatively to acquisition of new differentiation potentials.  

PubMed

Mesenchymal stromal cell populations include a fraction, termed mesenchymal stem cells, exhibiting multipotency. Other cells within this population possess a lesser differentiation range. This was assumed to be due to a mesenchymal cellular cascade topped by a multipotent cell, which gives rise to progeny with diminishing differentiation potentials. Here, we show that mesenchymal cells, a priori exhibiting a limited differentiation potential, may gain new capacities and become multipotent following single-cell isolation. These fate changes were accompanied by upregulation of differentiation promoting genes, many of which also became H4K20me1 methylated. Early events in the process included TGF? and Wnt modulation, and downregulation of hypoxia signaling. Indeed, hypoxic conditions inhibited the observed cell changes. Overall, cell isolation from neighboring partners caused major molecular changes and particularly, a newly established epigenetic state, ultimately leading to the acquisition of new differentiation potentials and an altered cell fate. Stem Cells 2014;32:2008-2020. PMID:24715711

Shoshani, Ofer; Ravid, Orly; Massalha, Hassan; Aharonov, Alla; Ovadya, Yossi; Pevsner-Fischer, Meirav; Leshkowitz, Dena; Zipori, Dov

2014-08-01

321

Detection of multiple potentially pathogenic bacteria in Matang mangrove estuaries, Malaysia.  

PubMed

The deltaic estuarine system of the Matang Mangrove Forest Reserve of Malaysia is a site where several human settlements and brackish water aquaculture have been established. Here, we evaluated the level of fecal indicator bacteria (FIB) and the presence of potentially pathogenic bacteria in the surface water and sediments. Higher levels of FIB were detected at downstream sampling sites from the fishing village, indicating it as a possible source of anthropogenic pollution to the estuary. Enterococci levels in the estuarine sediments were higher than in the surface water, while total coliforms and E. coli in the estuarine sediments were not detected in all samples. Also, various types of potentially pathogenic bacteria, including Klebsiella pneumoniae, Serratia marcescens and Enterobacter cloacae were isolated. The results indicate that the Matang estuarine system is contaminated with various types of potential human bacterial pathogens which might pose a health risk to the public. PMID:24820641

Ghaderpour, Aziz; Mohd Nasori, Khairul Nazrin; Chew, Li Lee; Chong, Ving Ching; Thong, Kwai Lin; Chai, Lay Ching

2014-06-15

322

Differential potential for envelope glycoprotein-mediated steric shielding of host cell surface proteins among filoviruses.  

PubMed

The viral envelope glycoprotein (GP) is thought to play important roles in the pathogenesis of filovirus infection. It is known that GP expressed on the cell surface forms a steric shield over host proteins such as major histocompatibility complex class I and integrin ?1, which may result in the disorder of cell-to-cell contacts and/or inhibition of the immune response. However, it is not clarified whether this phenomenon contributes to the pathogenicity of filoviruses. In this study, we found that the steric shielding efficiency differed among filovirus strains and was correlated with the difference in their relative pathogenicities. While the highly glycosylated mucin-like region of GP was indispensable, the differential shielding efficiency did not necessarily depend on the primary structure of the mucin-like region, suggesting the importance of the overall properties (e.g., flexibility and stability) of the GP molecule for efficient shielding of host proteins. PMID:24074577

Noyori, Osamu; Matsuno, Keita; Kajihara, Masahiro; Nakayama, Eri; Igarashi, Manabu; Kuroda, Makoto; Isoda, Norikazu; Yoshida, Reiko; Takada, Ayato

2013-11-01

323

Identification of differentially expressed genes that potentially confer pest resistance in transgenic ChIFN-? tobacco.  

PubMed

Chicken interferon-? (ChIFN-?) is both an inhibitor of viral replication and a regulator of numerous immunological functions. However, since little is known about the mechanisms underlying the insect-resistance of transgenic ChIFN-?, a transgenic ChIFN-? tobacco line was employed in the present study to explore this mechanism. A cDNA microarray (with 43,760 unigenes) was used to analyze the gene expression profiles of transgenic and wild-type (WT) tobacco leaves at two different growth stages. Compared with the WT, 1529 and 405 expressed sequence tags were significantly up- or downregulated on days 119 and 147, respectively. The differentially expressed genes (DEGs) are involved in metabolic regulation, cell division and differentiation, material synthesis and transport, signal transduction, and protein synthesis and degradation. Candidate genes that may increase cell density, thicken cell walls, promote secondary metabolite synthesis, and mediate plant hormone-induced resistance responses were used to identify the ChIFN-?-mediated insect-resistance mechanisms. The insect-resistance of transgenic ChIFN-? tobacco possibly involves unknown signaling pathways, which may directly or indirectly affect DEG expression-mediating genes. The degree of pest resistance increased as the plants grew. Three genes likely to be related to jasmonic acid- or salicylic acid-dependent plant defense responses, including CAF 1, Cop 8/CSN, and HD, are implicated in the insect-resistance of the transgenic plants. The mechanism of transgenic ChIFN-? tobacco resistance also involves RPS20 and other genes that induce microRNA-based gene regulation. The ChIFN-?-mediated DGEs contribute to insect-resistance in transgenic ChIFN-? tobacco, which provides new insight into the role of ChIFN-?. PMID:24747016

Wu, Yong-Jun; Wu, Yu-Jun; Luo, Xi; Shen, Xi-Long; Zhao, De-Gang

2014-06-15

324

Epithelial-mesenchymal transition-derived cells exhibit multi-lineage differentiation potential similar to mesenchymal stem cells  

PubMed Central

Summary The epithelial-to-mesenchymal transition (EMT) is an embryonic process that becomes latent in most normal adult tissues. Recently, we have shown that induction of EMT endows breast epithelial cells with stem cell traits. In this report, we have further characterized the EMT-derived cells and shown that these cells are similar to mesenchymal stem cells (MSCs) with the capacity to differentiate into multiple tissue lineages. For this purpose, we induced EMT by ectopic expression of Twist, Snail or TGF-? in immortalized human mammary epithelial cells (HMECs). We found that the EMT-derived cells and MSCs share many properties including the antigenic profile typical of MSCs, i.e. CD44+, CD24? and CD45?. Conversely, MSCs express EMT-associated genes, such as Twist, Snail and FOXC2. Interestingly, CD140b (PDGFR-?), a marker for naive MSCs, is exclusively expressed in EMT-derived cells and not in their epithelial counterparts. Moreover, functional analyses revealed that EMT-derived cells but not the control cells can differentiate into Alizarin Red S-positive mature osteoblasts, Oil Red O-positive adipocytes and Alcian Blue-positive chondrocytes similar to MSCs. We also observed that EMT-derived cells but not the control cells invade and migrate towards MDA-MB-231 breast cancer cells similar to MSCs. In vivo wound homing assays in nude mice revealed that the EMT-derived cells home to wound sites similar to MSCs. In conclusion, we have demonstrated that the EMT-derived cells are similar to MSCs in gene expression, multi-lineage differentiation, and ability to migrate towards tumor cells and wound sites.

Battula, Venkata L.; Evans, Kurt W.; Hollier, Brett G.; Shi, Yuexi; Marini, Frank C.; Ayyanan, Ayyakkannu; Wang, Rui-Yu; Brisken, Cathrin; Guerra, Rudy; Andreeff, Michael; Mani, Sendurai A.

2012-01-01

325

Potential role of the neuropeptide CGRP in the induction of differentiation of rat hepatic portal vein wall.  

PubMed

The media of the rat hepatic portal vein is composed of an internal circular muscular layer (CL) and an external longitudinal muscular layer (LL). These two perpendicular layers differentiate progressively from mesenchymal cells within the first month after birth. In this paper, we studied the development of calcitonin gene-related peptide (CGRP) innervation during post-natal differentiation of the vessel. We show that CGRP innervation is already present around the vessel at birth in the future adventitia but far from the lumen of the vessel. Progressively, CGRP immunoreactive fibers reached first LL then CL. CL by itself become only innervated at day 14 after birth. This corresponds to the time at which thick filaments (myosin) are visible in electron microscopy and desmin visualisable by immunocytochemistry. Furthermore, we provide evidence by autoradiography, that binding sites for CGRP are transiently expressed on the portal vein media at day 1 and 14 after birth. Vascular smooth muscle cells were transfected with constructs containing promoters for desmin or smooth muscle myosin heavy chain (smMHC). CGRP treatment of the cells significantly increased the expression of smMHC. Overall these results suggest that CGRP can potentially influence the differentiation of smooth muscle cells from the vessel wall. PMID:16112394

Thiévent, A; Sena, S; Parlakian, A; Breuzard, G; Beley, A; Rochette, L; Connat, J L

2005-09-01

326

Impact of low oxygen tension on stemness, proliferation and differentiation potential of human adipose-derived stem cells.  

PubMed

Adipose-derived stem cells (ASCs) have been found adapted to a specific niche with low oxygen tension (hypoxia) in the body. As an important component of this niche, oxygen tension has been known to play a critical role in the maintenance of stem cell characteristics. However, the effect of O2 tension on their functional properties has not been well determined. In this study, we investigated the effects of O2 tension on ASCs stemness, differentiation and proliferation ability. Human ASCs were cultured under normoxia (21% O2) and hypoxia (2% O2). We found that hypoxia increased ASC stemness marker expression and proliferation rate without altering their morphology and surface markers. Low oxygen tension further enhances the chondrogenic differentiation ability, but reduces both adipogenic and osteogenic differentiation potential. These results might be correlated with the increased expression of HIF-1? under hypoxia. Taken together, we suggest that growing ASCs under 2% O2 tension may be important in expanding ASCs effectively while maintaining their functional properties for clinical therapy, particularly for the treatment of cartilage defects. PMID:24785372

Choi, Jane Ru; Pingguan-Murphy, Belinda; Wan Abas, Wan Abu Bakar; Noor Azmi, Mat Adenan; Omar, Siti Zawiah; Chua, Kien Hui; Wan Safwani, Wan Kamarul Zaman

2014-05-30

327

Chronic binge alcohol consumption alters myogenic gene expression and reduces in vitro myogenic differentiation potential of myoblasts from rhesus macaques.  

PubMed

Chronic alcohol abuse is associated with skeletal muscle myopathy. Previously, we demonstrated that chronic binge alcohol (CBA) consumption by rhesus macaques accentuates skeletal muscle wasting at end-stage of simian immunodeficiency virus (SIV) infection. A proinflammatory, prooxidative milieu and enhanced ubiquitin proteasome activity were identified as possible mechanisms leading to loss of skeletal muscle. The possibility that impaired regenerative capacity, as reflected by the ability of myoblasts derived from satellite cell (SCs) to differentiate into myotubes has not been examined. We hypothesized that the inflammation and oxidative stress in skeletal muscle from CBA animals impair the differentiation capacity of myoblasts to form new myofibers in in vitro assays. We isolated primary myoblasts from the quadriceps femoris of rhesus macaques that were administered CBA or isocaloric sucrose (SUC) for 19 mo. Proliferation and differentiation potential of cultured myoblasts were examined in vitro. Myoblasts from the CBA group had significantly reduced PAX7, MYOD1, MYOG, MYF5, and MEF2C expression. This was associated with decreased myotube formation as evidenced by Jenner-Giemsa staining and myonuclei fusion index. No significant difference in the proliferative ability, cell cycle distribution, or autophagy was detected between myoblasts isolated from CBA and SUC groups. Together, these results reflect marked dysregulation of myoblast myogenic gene expression and myotube formation, which we interpret as evidence of impaired skeletal muscle regenerative capacity in CBA-administered macaques. The contribution of this mechanism to alcoholic myopathy warrants further investigation. PMID:24671243

Simon, Liz; LeCapitaine, Nicole; Berner, Paul; Vande Stouwe, Curtis; Mussell, Jason C; Allerton, Timothy; Primeaux, Stefany D; Dufour, Jason; Nelson, Steve; Bagby, Gregory J; Cefalu, William; Molina, Patricia E

2014-06-01

328

Sexual differentiation in the distribution potential of northern jaguars (Panthera onca)  

USGS Publications Warehouse

We estimated the potential geographic distribution of jaguars in the southwestern United States and northwestern Mexico by modeling the jaguar ecological niche from occurrence records. We modeled separately the distribution of males and females, assuming records of females probably represented established home ranges while male records likely included dispersal movements. The predicted distribution for males was larger than that for females. Eastern Sonora appeared capable for supporting male and female jaguars with potential range expansion into southeastern Arizona. New Mexico and Chihuahua contained environmental characteristics primarily limited to the male niche and thus may be areas into which males occasionally disperse.

Boydston, Erin E.; Lopez Gonzalez, Carlos A.

2005-01-01

329

Alemtuzumab: evidence for its potential in relapsing-remitting multiple sclerosis.  

PubMed

Alemtuzumab (previously known as Campath(®)) is a humanized monoclonal antibody directed against the CD52 antigen on mature lymphocytes that results in lymphopenia and subsequent modification of the immune repertoire. Here we explore evidence for its efficacy and safety in relapsing-remitting multiple sclerosis. One Phase II and two Phase III trials of alemtuzumab versus active comparator (interferon beta-1a) have been reported. Two of these rater-blinded randomized studies assessed clinical and radiological outcomes in treatment-naïve patients; one explored patients who had relapsed despite first-line therapy. Compared to interferon beta-1a, alemtuzumab reduced the relapse rate by 49%-74% (P < 0.0001), and in two studies it reduced the risk of sustained disability accumulation by 42%-71% (P < 0.01). In one study (Comparison of Alemtuzumab and Rebif Efficacy in Multiple Sclerosis; CARE-MS1), there was no significant difference compared to interferon, perhaps reflecting the surprisingly low frequency of disability events in the comparator group. After alemtuzumab, the Expanded Disability Status Scale score improved by 0.14-1.2 points, culminating in a net advantage with alemtuzumab of 0.41-0.77 points over interferon in the CAMMS223 and CARE-MS2 trials (both P < 0.001). Radiological markers of new lesion formation and brain atrophy following alemtuzumab were significantly improved when compared to interferon in all studies. Adverse events were more common following alemtuzumab than interferon beta-1a (7.2-8.66 versus 4.9-5.7 events per person-year). While infusion reactions are the most common, autoimmunity is the most concerning; within Phase III studies, thyroid disorders (17%-18% versus 5%-6%) and immune thrombocytopenic purpura (1% versus 0%) were reported in patients taking alemtuzumab and interferon beta-1a, respectively. All patients responded to conventional therapy. One patient taking alemtuzumab in the Phase II study suffered a fatal intracranial hemorrhage following immune thrombocytopenic purpura, heralding assiduous monitoring of all patients thereafter. Alemtuzumab has been submitted for licensing in relapsing-remitting multiple sclerosis in the United States and Europe. PMID:23494602

Brown, J William L; Coles, Alasdair J

2013-01-01

330

Word frequency and multiple repetition as determinants of the modulation of event-related potentials in a semantic classification task.  

PubMed

We recorded event-related potentials while subjects performed a category membership decision task. The stimuli were words of high and low frequency of occurrence in written English, and each was presented four times. The experiment was intended to explore the interaction of word frequency and multiple repetition on the event-related potential, and thence to investigate the possible loci in time of the effects of these variables. First presentations of low and high frequency words evoked event-related potentials which differed in the presence, in the low word frequency waveforms, of a right-hemisphere dominant negativity peaking at 400 ms. This negativity was very similar to the N400 which may be sensitive to the semantic relations among words in a sequence. Initial repetition diminished this midlatency difference, but gave rise to both earlier and later frequency-related differences. Subsequent multiple repetition abolished the early frequency-related repetition effect, but did not affect amplitudes in the region of N400, nor did it abolish a late positivity, present only for repeated low frequency words. PMID:1461957

Young, M P; Rugg, M D

1992-11-01

331

Acute exercise preferentially redeploys NK-cells with a highly-differentiated phenotype and augments cytotoxicity against lymphoma and multiple myeloma target cells.  

PubMed

NK-cells undergo a "licensing" process as they develop into fully-functional cells capable of efficiently killing targets. NK-cell differentiation is accompanied by an increased surface expression of inhibitory killer immunoglobulin-like receptor (KIR) molecules, which is positively associated with cytotoxicity against the HLA-deficient K562 cell line. NK-cells are rapidly redeployed between the blood and tissues in response to acute exercise, but it is not known if exercise evokes a preferential trafficking of differentiated NK-cells or impacts NK-cell cytotoxic activity (NKCA) against HLA-expressing target cells. Sixteen healthy cyclists performed three 30-min bouts of cycling exercise at -5%, +5%, and +15% of lactate threshold. Blood samples obtained before, immediately after, and 1h after exercise were used to enumerate NK-cells and their subsets, and determine NKCA and degranulating subsets (CD107+) against cell lines of multiple myeloma (U266 and RPMI-8226), lymphoma (721.221 and 221 AEH), and leukemia (K562) origin by 4 and 10-color flow cytometry, respectively. Exercise evoked a stepwise redeployment of NK-cell subsets in accordance with differentiation status [highly-differentiated (KIR+/NKG2A-) >medium-differentiated (KIR+/NKG2A+)>low-differentiated (KIR-/NKG2A+)] that was consistent across all exercise intensities. NKCA per cell increased ?1.6-fold against U266 and 221 AEH targets 1h post-exercise and was associated with a decreased proportion of NK-cells expressing the inhibitory receptor CD158b and increased proportion of NK-cells expressing the activating receptor NKG2C, respectively. We conclude that exercise evokes a preferential redeployment of NK-cell subsets with a high differentiation phenotype and augments cytotoxicity against HLA-expressing target cells. Exercise may serve as a simple strategy to enrich the blood compartment of highly cytotoxic NK-cell subsets that can be harvested for clinical use. PMID:24200514

Bigley, Austin B; Rezvani, Katayoun; Chew, Claude; Sekine, Takuya; Pistillo, Mira; Crucian, Brian; Bollard, Catherine M; Simpson, Richard J

2014-07-01

332

Orientation control of multiple underwater vehicles with symmetry-breaking potentials  

Microsoft Academic Search

We present a control strategy for stable orientation alignment of autonomous vehicles traveling together as a coordinated group in three-dimensional space. The control law derives from an artificial potential that depends only on the relative orientation of pairs of vehicles. The result is a controlled system of coupled rigid bodies with partially broken rotational symmetry. Semidirect product reduction theory is

Troy R. Smith; H. Hanssmann; Naomi Ehrich Leonard

2001-01-01

333

Two-Dimensional Potential Flow Theory for Multiple Bodies in Small-Amplitude Motion.  

National Technical Information Service (NTIS)

A method was developed for calculating the two-dimensional potential flow about two foils of arbitrary shape and at arbitrary incidence undergoing small-amplitude simple-harmonic motions. The two foils may be vibrating at two different frequencies. The co...

J. P. Giesing

1969-01-01

334

The electrostatic potentials generated by loading multiple batches of product into a road tanker compartment  

Microsoft Academic Search

In some circumstances it is necessary to load road tanker compartments in two or more separate stages with significant waiting periods between each stage. At least one accident has occurred within a few seconds of the start of a second or subsequent stage and it has been a cause of some surprise that high potentials can be generated so rapidly

H. L. Walmsley

1996-01-01

335

Review of teriflunomide and its potential in the treatment of multiple sclerosis.  

PubMed

In the light of new cases of progressive multifocal leukoencephalopathy and induced autoimmunity in multiple sclerosis (MS) patients who received treatment with upcoming disease-modifying immunosuppressant drugs with a highly specific mode of action such as natalizumab, rituximab, or alemtuzumab, alternative oral treatment options for a subgroup of less severely affected MS patients are a major focus of drug development. These agents are currently investigated in phase III clinical trials and some of them are characterized by a favorable safety profile. With an emphasis on teriflunomide, the active metabolite of an immunosuppressant approved for the treatment of rheumatoid arthritis since 1998, a number of oral treatment options for patients with MS are discussed. PMID:19557143

Warnke, Clemens; Meyer zu Hörste, Gerd; Hartung, Hans-Peter; Stüve, Olaf; Kieseier, Bernd C

2009-01-01

336

Capacity to Make Medical Treatment Decisions in Multiple Sclerosis: A Potentially Remediable Deficit  

PubMed Central

Ability to make decisions about medical treatment is compromised in significant numbers of people with neurological and psychiatric illness, and this incapacity frequently corresponds with compromised neuropsychological function. Although cognitive deficits occur often in people with multiple sclerosis (MS), no research has studied decisional capacity in that disease. The present investigation examined ability to understand treatment disclosures, which is a core component of decisional capacity, in 36 people with MS and 16 normal controls. MS patients with diminished neuropsychological function showed poor understanding of treatment disclosures compared to the control group, and diminished new-learning and executive function correlated with poorer understanding. Nonetheless, with sufficient cueing, the MS patients with diminished neuropsychological function were able to display understanding that was equivalent to the control group. Implications of these results for clinical practice and medical research involving people with MS are discussed.

Basso, Michael R.; Candilis, Philip J.; Johnson, Jay; Ghormley, Courtney; Combs, Dennis R.; Ward, Taeh

2010-01-01

337

Sexual differentiation of the zebra finch song system: potential roles for sex chromosome genes  

Microsoft Academic Search

BACKGROUND: Recent evidence suggests that some sex differences in brain and behavior might result from direct genetic effects, and not solely the result of the organizational effects of steroid hormones. The present study examined the potential role for sex-biased gene expression during development of sexually dimorphic singing behavior and associated song nuclei in juvenile zebra finches. RESULTS: A microarray screen

Michelle L Tomaszycki; Camilla Peabody; Kirstin Replogle; David F Clayton; Robert J Tempelman; Juli Wade

2009-01-01

338

Human Adipose Tissue-Derived SSEA-4 Subpopulation Multi-Differentiation Potential Towards the Endothelial and Osteogenic Lineages  

PubMed Central

Human adipose tissue has been recently recognized as a potential source of stem cells for regenerative medicine applications, including bone tissue engineering (TE). Despite the gathered knowledge regarding the differentiation potential of human adipose tissue-derived stem cells (hASCs), in what concerns the endothelial lineage many uncertainties are still present. The existence of a cell subpopulation within the human adipose tissue that expresses a SSEA-4 marker, usually associated to pluripotency, raises expectations on the differentiation capacity of these cells (SSEA-4+hASCs). In the present study, the endothelial and osteogenic differentiation potential of the SSEA-4+hASCs was analyzed, aiming at proposing a single-cell source/subpopulation for the development of vascularized bone TE constructs. SSEA-4+hASCs were isolated using immunomagnetic sorting and cultured either in ?-MEM, in EGM-2 MV (endothelial growth medium), or in osteogenic medium. SSEA-4+hASCs cultured in EGM-2 MV formed endothelial cell-like colonies characterized by a cobblestone morphology and expression of CD31, CD34, CD105, and von Willebrand factor as determined by quantitative reverse transcriptase (RT)-polymerase chain reaction, immunofluorescence, and flow cytometry. The endothelial phenotype was also confirmed by their ability to incorporate acetylated low-density lipoprotein and to form capillary-like structures when seeded on Matrigel. SSEA-4+hASCs cultured in ?-MEM displayed fibroblastic-like morphology and exhibited a mesenchymal surface marker profile (>90% CD90+/CD73+/CD105+). After culture in osteogenic conditions, an overexpression of osteogenic-related markers (osteopontin and osteocalcin) was observed both at molecular and protein levels. Matrix mineralization detected by Alizarin Red staining confirmed SSEA-4+hASCs osteogenic differentiation. Herein, we demonstrate that from a single-cell source, human adipose tissue, and by selecting the appropriate subpopulation it is possible to obtain microvascular-like endothelial cells and osteoblasts, the most relevant cell types for the creation of vascularized bone tissue-engineered constructs.

Mihaila, Silvia M.; Frias, Ana M.; Pirraco, Rogerio P.; Rada, Tommaso; Reis, Rui L.; Gomes, Manuela E.

2013-01-01

339

Human adipose tissue-derived SSEA-4 subpopulation multi-differentiation potential towards the endothelial and osteogenic lineages.  

PubMed

Human adipose tissue has been recently recognized as a potential source of stem cells for regenerative medicine applications, including bone tissue engineering (TE). Despite the gathered knowledge regarding the differentiation potential of human adipose tissue-derived stem cells (hASCs), in what concerns the endothelial lineage many uncertainties are still present. The existence of a cell subpopulation within the human adipose tissue that expresses a SSEA-4 marker, usually associated to pluripotency, raises expectations on the differentiation capacity of these cells (SSEA-4(+)hASCs). In the present study, the endothelial and osteogenic differentiation potential of the SSEA-4(+)hASCs was analyzed, aiming at proposing a single-cell source/subpopulation for the development of vascularized bone TE constructs. SSEA-4(+)hASCs were isolated using immunomagnetic sorting and cultured either in ?-MEM, in EGM-2 MV (endothelial growth medium), or in osteogenic medium. SSEA-4(+)hASCs cultured in EGM-2 MV formed endothelial cell-like colonies characterized by a cobblestone morphology and expression of CD31, CD34, CD105, and von Willebrand factor as determined by quantitative reverse transcriptase (RT)-polymerase chain reaction, immunofluorescence, and flow cytometry. The endothelial phenotype was also confirmed by their ability to incorporate acetylated low-density lipoprotein and to form capillary-like structures when seeded on Matrigel. SSEA-4(+)hASCs cultured in ?-MEM displayed fibroblastic-like morphology and exhibited a mesenchymal surface marker profile (>90% CD90(+)/CD73(+)/CD105(+)). After culture in osteogenic conditions, an overexpression of osteogenic-related markers (osteopontin and osteocalcin) was observed both at molecular and protein levels. Matrix mineralization detected by Alizarin Red staining confirmed SSEA-4(+)hASCs osteogenic differentiation. Herein, we demonstrate that from a single-cell source, human adipose tissue, and by selecting the appropriate subpopulation it is possible to obtain microvascular-like endothelial cells and osteoblasts, the most relevant cell types for the creation of vascularized bone tissue-engineered constructs. PMID:22924692

Mihaila, Silvia M; Frias, Ana M; Pirraco, Rogério P; Rada, Tommaso; Reis, Rui L; Gomes, Manuela E; Marques, Alexandra P

2013-01-01

340

Interaction of rare gas metastable atoms. [Differential and total cross sections, elastic scattering, ionization, potential scattering, phase shifts, rate constants  

SciTech Connect

The physical and chemical properties of metastable rare gas atoms are discussed and summarized. This is followed by a detailed examination of the various possible pathways whereby the metastable's excess electronic energy can be dissipated. The phenomenon of chemi-ionization is given special emphasis, and a theoretical treatment based on the use of complex (optical) potential is presented. This is followed by a discussion on the unique advantages offered by elastic differential cross section measurements in the apprehension of the fundamental forces governing the ionization process. The methodology generally adopted to extract information about the interaction potential for scattering data is also systematically outlined. Two widely studied chemi-ionization systems are then closely examined in the light of accurate differential cross section measurements obtained in this work. The first system is He(2/sup 3/S) + Ar for which one can obtain an interaction potential which is in good harmony with the experimental results of other investigators. The validity of using the first-order semiclassical approximation for the phase shifts calculation in the presence of significant opacities is also discussed. The second reaction studied is He*+D/sub 2/ for which measurements were made on both spin states of the metastable helium. A self-consistent interaction potential is obtained for the triplet system, and reasons are given for not being able to do likewise for the singlet system. The anomalous hump proposed by a number of laboratories is analyzed. Total elastic and ionization cross sections as well as rate constants are calculated for the triplet case. Good agreement with experimental data is found. Finally, the construction and operation of a high power repetitively pulsed nitrogen laser pumped dye laser system is described in great details. Details for the construction and operation of a flashlamp pumped dye laser are likewise given.

Wang, A.Z.F.

1977-11-01

341

The decreased metastatic potential of rhabdomyosarcoma cells obtained through MET receptor downregulation and the induction of differentiation.  

PubMed

Rhabdomyosarcoma (RMS) is the most common type of pediatric soft tissue sarcoma. The MET receptor has an important role in the biology of RMS, and its overexpression and hyperactivation correlate with the metastatic ability of RMS. Consequently, interfering with MET expression or functionality may constitute a sound strategy for reducing the progression and metastatic potential of RMS. Our study reveals that downregulation of the MET receptor leads to changes in the morphology of ARMS cell in vivo. Tumors acquire a spindle shape that is characteristic of muscle fibers. Inhibition of MET expression or function leads to (i) a decreased expression of the early myogenic marker MyoD, (ii) a decreased ability of ARMS cells to metastasize to bone marrow cavities, (iii) downregulation of CXCR4 receptor expression and (iv) a decreased migration of MET-depleted cells towards gradients of HGF and SDF-1. Finally, we demonstrate that in vitro differentiation of alveolar RMS cells decreases their metastatic behavior by reducing both the expression of the MET and CXCR4 receptors and their migratory response to HGF and SDF-1. These findings suggest that blockers of MET receptor function and inducers of RMS cells differentiation may be clinically useful for reducing the aggressiveness and metastatic potential of RMS and may have significant implications for its treatment. PMID:23328666

Miekus, K; Lukasiewicz, E; Jarocha, D; Sekula, M; Drabik, G; Majka, M

2013-01-01

342

The decreased metastatic potential of rhabdomyosarcoma cells obtained through MET receptor downregulation and the induction of differentiation  

PubMed Central

Rhabdomyosarcoma (RMS) is the most common type of pediatric soft tissue sarcoma. The MET receptor has an important role in the biology of RMS, and its overexpression and hyperactivation correlate with the metastatic ability of RMS. Consequently, interfering with MET expression or functionality may constitute a sound strategy for reducing the progression and metastatic potential of RMS. Our study reveals that downregulation of the MET receptor leads to changes in the morphology of ARMS cell in vivo. Tumors acquire a spindle shape that is characteristic of muscle fibers. Inhibition of MET expression or function leads to (i) a decreased expression of the early myogenic marker MyoD, (ii) a decreased ability of ARMS cells to metastasize to bone marrow cavities, (iii) downregulation of CXCR4 receptor expression and (iv) a decreased migration of MET-depleted cells towards gradients of HGF and SDF-1. Finally, we demonstrate that in vitro differentiation of alveolar RMS cells decreases their metastatic behavior by reducing both the expression of the MET and CXCR4 receptors and their migratory response to HGF and SDF-1. These findings suggest that blockers of MET receptor function and inducers of RMS cells differentiation may be clinically useful for reducing the aggressiveness and metastatic potential of RMS and may have significant implications for its treatment.

Miekus, K; Lukasiewicz, E; Jarocha, D; Sekula, M; Drabik, G; Majka, M

2013-01-01

343

Insulin-like Growth Factor 2 (IGF-2) Potentiates BMP-9-Induced Osteogenic Differentiation and Bone Formation  

PubMed Central

Efficient osteogenic differentiation and bone formation from mesenchymal stem cells (MSCs) should have clinical applications in treating nonunion fracture healing. MSCs are adherent bone marrow stromal cells that can self-renew and differentiate into osteogenic, chondrogenic, adipogenic, and myogenic lineages. We have identified bone morphogenetic protein 9 (BMP-9) as one of the most osteogenic BMPs. Here we investigate the effect of insulin-like growth factor 2 (IGF-2) on BMP-9-induced bone formation. We have found that endogenous IGF-2 expression is low in MSCs. Expression of IGF-2 can potentiate BMP-9-induced early osteogenic marker alkaline phosphatase (ALP) activity and the expression of later markers. IGF-2 has been shown to augment BMP-9-induced ectopic bone formation in the stem cell implantation assay. In perinatal limb explant culture assay, IGF-2 enhances BMP-9-induced endochondral ossification, whereas IGF-2 itself can promote the expansion of the hypertropic chondrocyte zone of the cultured limb explants. Expression of the IGF antagonists IGFBP3 and IGFBP4 leads to inhibition of the IGF-2 effect on BMP-9-induced ALP activity and matrix mineralization. Mechanistically, IGF-2 is further shown to enhance the BMP-9-induced BMPR-Smad reporter activity and Smad1/5/8 nuclear translocation. PI3-kinase (PI3K) inhibitor LY294002 abolishes the IGF-2 potentiation effect on BMP-9-mediated osteogenic signaling and can directly inhibit BMP-9 activity. These results demonstrate that BMP-9 crosstalks with IGF-2 through PI3K/AKT signaling pathway during osteogenic differentiation of MSCs. Taken together, our findings suggest that a combination of BMP-9 and IGF-2 may be explored as an effective bone-regeneration agent to treat large segmental bony defects, nonunion fracture, and/or osteoporotic fracture. © 2010 American Society for Bone and Mineral Research.

Chen, Liang; Jiang, Wei; Huang, Jiayi; He, Bai-Cheng; Zuo, Guo-Wei; Zhang, Wenli; Luo, Qing; Shi, Qiong; Zhang, Bing-Qiang; Wagner, Eric R; Luo, Jinyong; Tang, Min; Wietholt, Christian; Luo, Xiaoji; Bi, Yang; Su, Yuxi; Liu, Bo; Kim, Stephanie H; He, Connie J; Hu, Yawen; Shen, Jikun; Rastegar, Farbod; Huang, Enyi; Gao, Yanhong; Gao, Jian-Li; Zhou, Jian-Zhong; Reid, Russell R; Luu, Hue H; Haydon, Rex C; He, Tong-Chuan; Deng, Zhong-Liang

2010-01-01

344

Differential effects on the laser evoked potential of selectively attending to pain localisation versus pain unpleasantness  

Microsoft Academic Search

Objective: To determine the effects on the laser evoked potential (LEP) of selectively attending to affective (unpleasantness) versus sensory-discriminative (localisation) components of pain.Methods: LEPs, elicited by painful CO2 laser stimulation of two areas of the right forearm, were recorded from 62 electrodes in 21 healthy volunteers, during three tasks that were matched for generalised attention: Localisation (report stimulus location), Unpleasantness

D. E Bentley; A Watson; R.-D Treede; G Barrett; P. D Youell; B Kulkarni; A. K. P Jones

2004-01-01

345

Diagnostic potential of near-infrared Raman spectroscopy in the colon: Differentiating adenomatous from hyperplastic polyps  

Microsoft Academic Search

Background: Near-infrared Raman spectroscopy is a promising optical technique for GI tissue diagnosis. This study assessed the diagnostic potential of near-infrared Raman spectroscopy in the colon by evaluating its ability to distinguish between adenomatous and hyperplastic polyps. Methods: Ex vivo and in vivo Raman spectra of colon polyps were collected by using a custom-built, fiber-optic, near-infrared Raman spectroscopic system. Multivariate

Andrea Molckovsky; Louis-Michel Wong Kee Song; Martin G. Shim; Norman E. Marcon; Brian C. Wilson

2003-01-01

346

The PWWP domain: a potential protein–protein interaction domain in nuclear proteins influencing differentiation?  

Microsoft Academic Search

Upon characterization of WHSC1, a gene mapping to the Wolf–Hirschhorn syndrome critical region and at its C-terminus similar to the Drosophila ASH1\\/trithorax group proteins, we identified a novel protein domain designated PWWP domain. To gain insight into its structure, evolutionary conservation and its potential functional role, we performed database searches to identify other PWWP domain-containing proteins. We retrieved 39 proteins,

Ingrid Stec; Sylvia B. Nagl; Gert-Jan B. van Ommen; Johan T. den Dunnen

2000-01-01

347

Differential Expression of Metallothionein 1 and 2 Isoforms in Breast Cancer Lines with Different Invasive Potential  

PubMed Central

Metallothionein (MT), a low-molecular weight protein with pleiotropic functions, is believed to play an important role in tumorigenesis. The aim of this study was to compare the expression of functional MT-1 and MT-2 mRNA isoforms in five breast cancer cell lines ranging from noninvasive MCF7 breast cancer cells to highly aggressive MDA-MB-231 breast cancer cells together with breast myoepithelial cells in vitro by conventional semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR) and quantitative real-time RT-PCR. The MT-2A isoform was observed to be differentially upregulated in the invasive phenotype. The MT-1E isoform was found to be present in estrogen receptor-negative breast cancer cell lines (MDA-MB-231 and Hs578T) but not detectable in the estrogen receptor-positive cell lines (T47D, MCF7, and ZR75-1 cells). Only the myoepithelial cells exhibited the presence of the MT-1G transcript. Direct sequencing of the RT-PCR products revealed the occurrence of a variant MT-1H isoform with changes in amino acid residues in the protein sequence and notable differences in the predicted secondary protein structure. The observations in this study are relevant to the development of novel approaches to metastatic breast cancer disease, and may herald the search for novel MT mutants and the elucidation of their biological roles.

Tai, Siew-Kian; Tan, Owen June-Keong; Chow, Vincent Tak-Kwong; Jin, Rongxian; Jones, J. Louise; Tan, Puay-Hoon; Jayasurya, Anita; Bay, Boon-Huat

2003-01-01

348

TLR Stimulation of Bone Marrow Lymphoid Precursors from Childhood Acute Leukemia Modifies Their Differentiation Potentials  

PubMed Central

Acute leukemias are the most frequent childhood malignancies worldwide and remain a leading cause of morbidity and mortality of relapsed patients. While remarkable progress has been made in characterizing genetic aberrations that may control these hematological disorders, it has also become clear that abnormalities in the bone marrow microenvironment might hit precursor cells and contribute to disease. However, responses of leukemic precursor cells to inflammatory conditions or microbial components upon infection are yet unexplored. Our previous work and increasing evidence indicate that Toll-like receptors (TLRs) in the earliest stages of lymphoid development in mice and humans provide an important mechanism for producing cells of the innate immune system. Using highly controlled co-culture systems, we now show that lymphoid precursors from leukemic bone marrow express TLRs and respond to their ligation by changing cell differentiation patterns. While no apparent contribution of TLR signals to tumor progression was recorded for any of the investigated diseases, the replenishment of innate cells was consistently promoted upon in vitro TLR exposure, suggesting that early recognition of pathogen-associated molecules might be implicated in the regulation of hematopoietic cell fate decisions in childhood acute leukemia.

Dorantes-Acosta, Elisa; Balandran, Juan Carlos; Arriaga-Pizano, Lourdes; Purizaca, Jessica; Huerta-Yepez, Sara; Jimenez, Elva; Aguilera, Wendy; Medina-Sanson, Aurora; Mayani, Hector

2013-01-01

349

TLR stimulation of bone marrow lymphoid precursors from childhood acute leukemia modifies their differentiation potentials.  

PubMed

Acute leukemias are the most frequent childhood malignancies worldwide and remain a leading cause of morbidity and mortality of relapsed patients. While remarkable progress has been made in characterizing genetic aberrations that may control these hematological disorders, it has also become clear that abnormalities in the bone marrow microenvironment might hit precursor cells and contribute to disease. However, responses of leukemic precursor cells to inflammatory conditions or microbial components upon infection are yet unexplored. Our previous work and increasing evidence indicate that Toll-like receptors (TLRs) in the earliest stages of lymphoid development in mice and humans provide an important mechanism for producing cells of the innate immune system. Using highly controlled co-culture systems, we now show that lymphoid precursors from leukemic bone marrow express TLRs and respond to their ligation by changing cell differentiation patterns. While no apparent contribution of TLR signals to tumor progression was recorded for any of the investigated diseases, the replenishment of innate cells was consistently promoted upon in vitro TLR exposure, suggesting that early recognition of pathogen-associated molecules might be implicated in the regulation of hematopoietic cell fate decisions in childhood acute leukemia. PMID:24106720

Dorantes-Acosta, Elisa; Vadillo, Eduardo; Contreras-Quiroz, Adriana; Balandrán, Juan Carlos; Arriaga-Pizano, Lourdes; Purizaca, Jessica; Huerta-Yepez, Sara; Jiménez, Elva; Aguilera, Wendy; Medina-Sanson, Aurora; Mayani, Héctor; Pelayo, Rosana

2013-01-01

350

Transthyretin as a potential biomarker for the differential diagnosis between lung cancer and lung infection  

PubMed Central

Satisfactory biomarkers for screening and early diagnosis of lung cancer remain scarce and require further investigation. The aim of the present study was to examine the changes of the biochemical and protein composition in the serum and pleural effusion from lung cancer and lung infection (bacterial pneumonia) patients. A total of 92 patients with lung cancer, 38 with bacterial pneumonia and 42 healthy controls were enrolled in the study. The serum levels of cholesterol, apolipoprotein A and transthyretin (TTR) in the lung cancer patients were higher than that of the lung infection patients (P<0.05). The levels of TTR were higher, whereas the activity of adenosine deaminase (ADA) was lower in the pleural effusion from the lung cancer patients compared to the lung infection patients (P<0.05). Furthermore, the pleural effusion/serum TTR ratios in the lung cancer patients were higher, whereas the ratios of ADA were lower (P<0.05). By matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis, four major peaks corresponding to native TTR, Sul-TTR, Cys-TTR and Cysgly-TTR were observed in the serum of the lung cancer and lung infection patients. A significant increase was found in the proportion of Cysgly-TTR in the pleural effusion from the patients with lung cancer. The data indicated that a combination of pleural effusion/serum TTR ratios and modified TTR may be beneficial for the differential diagnosis between lung cancer and lung infection.

DING, HONGMEI; LIU, JIANHUA; XUE, RONG; ZHAO, PENG; QIN, YI; ZHENG, FANG; SUN, XUGUO

2014-01-01

351

Differentiation potential of osteoblast from cultured C2C12 cells on zirconia disk.  

PubMed

We examined the adaptability of zirconia as a fixture for implants. A mouse myoblast cell line (C2C12) was seeded on Ce-TZP and titanium disks, and on poly-L-lysine-coated glass slides. Proliferation potency was determined by cell counting and mineral induction by BMP2 was studied. The osteoblastic differentiation potency was determined by alkaline phosphatase (ALP) and alizarin red (ARS) staining. ALP activity and calcium concentrations were colorimetrically measured. The number of cells on all materials was approximately equal. ALP and ARS staining showed densely-stained images, demonstrating the induction of C2C12 cells to express the osteoblastic phenotype. RT-PCR showed that mRNA expressions of type I collagen, osteocalcin, osterix and ALP were up-regulated. With regard to ALP activity and calcium concentration of C2C12 cells, no significant differences were observed between Ce-TZP and titanium disks. We conclude that Ce-TZP has the biological activity comparable to titanium and has the utility as fixture of dental implants. PMID:24682023

Saito, Mari; Karakida, Takeo; Yamamoto, Ryuji; Nagano, Takatoshi; Yamakoshi, Yasuo; Hayakawa, Tohru; Oida, Shinichiro; Gomi, Kazuhiro

2014-01-01

352

Role of proteomics to differentiate between benign and potentially malignant pancreatic cysts.  

PubMed

Pancreatic cystic neoplasms represent 10-15% of primary cystic masses of the pancreas. While pancreatic cysts are detected with an increasing frequency due to the use of advanced imaging modalities in clinical practice, the diagnosis of pancreatic cystic neoplasms remains unsatisfactory because available diagnostic techniques proved not sensitive enough so far. This study was designed to characterize the proteomic pattern of pancreatic cyst fluids obtained from various cystic lesions. Cyst fluids were collected by direct puncture during open surgery to avoid any possible contamination from other tissues. CEA, CA-19-9, and amylase concentrations were measured using specific immunoassays. After immunodepletion and fractionation by SDS-PAGE, proteins were digested and analyzed by LC-MS/MS. Specific histological lesions were found to be associated with distinct protein patterns. Interestingly, some of these proteins have been proposed as biomarkers of pancreatic cancer. Immunoblots allowed for verifying the differential expression in specific cyst fluids of two selected proteins, olfactomedin-4 and mucin-18. Finally, immunohistochemistry was performed to correlate these data with the expression pattern of olfactomedin-4 and mucin-18 in pancreatic cyst tissues. Results from this study indicate that proteomic analysis of cyst fluid could provide reliable candidates for developing new biomarkers for the preoperative management of malignant and premalignant pancreatic cysts. PMID:21425880

Cuoghi, Aurora; Farina, Annarita; Z'graggen, Kaspar; Dumonceau, Jean-Marc; Tomasi, Aldo; Hochstrasser, Denis F; Genevay, Muriel; Lescuyer, Pierre; Frossard, Jean-Louis

2011-05-01

353

A generalized Grubbs-Beck test statistic for detecting multiple potentially influential low outliers in flood series  

NASA Astrophysics Data System (ADS)

The Grubbs-Beck test is recommended by the federal guidelines for detection of low outliers in flood flow frequency computation in the United States. This paper presents a generalization of the Grubbs-Beck test for normal data (similar to the Rosner (1983) test; see also Spencer and McCuen (1996)) that can provide a consistent standard for identifying multiple potentially influential low flows. In cases where low outliers have been identified, they can be represented as "less-than" values, and a frequency distribution can be developed using censored-data statistical techniques, such as the Expected Moments Algorithm. This approach can improve the fit of the right-hand tail of a frequency distribution and provide protection from lack-of-fit due to unimportant but potentially influential low flows (PILFs) in a flood series, thus making the flood frequency analysis procedure more robust.

Cohn, T. A.; England, J. F.; Berenbrock, C. E.; Mason, R. R.; Stedinger, J. R.; Lamontagne, J. R.

2013-08-01

354

A generalized Grubbs-Beck test statistic for detecting multiple potentially influential low outliers in flood series  

USGS Publications Warehouse

he Grubbs-Beck test is recommended by the federal guidelines for detection of low outliers in flood flow frequency computation in the United States. This paper presents a generalization of the Grubbs-Beck test for normal data (similar to the Rosner (1983) test; see also Spencer and McCuen (1996)) that can provide a consistent standard for identifying multiple potentially influential low flows. In cases where low outliers have been identified, they can be represented as “less-than” values, and a frequency distribution can be developed using censored-data statistical techniques, such as the Expected Moments Algorithm. This approach can improve the fit of the right-hand tail of a frequency distribution and provide protection from lack-of-fit due to unimportant but potentially influential low flows (PILFs) in a flood series, thus making the flood frequency analysis procedure more robust.

Cohn, T. A.; England, J. F.; Berenbrock, C. E.; Mason, R. R.; Stedinger, J. R.; Lamontagne, J. R.

2013-01-01

355

Serum Parathyroid Hormone Is a New Potential Risk Factor in Multiple Myeloma  

PubMed Central

We hypothesized that serum PTH might be associated with various clinicopathological parameters in multiple myeloma (MM). So we investigated the implications of serum PTH in MM patients and the relationship with other risk factors of MM. A total of 115 patients who were newly diagnosed with MM were enrolled. Serum PTH level was 24.7 ± 34.9 (ranged 0.0–284.1)?pg/mL. Serum levels of IgG, IgM, FLC-lambda, albumin, and LDH were in positive correlation with serum PTH. Compared to non-high PTH (<68.3?pg/mL) group, the hazard ratio (HR) for overall survival was higher for group with high PTH level (?68.3?pg/mL) (HR, 1.710). Furthermore, the patient group with high PTH level showed inferior progression-free survival than non-high PTH group (P = 0.056). Interestingly, subgroup analysis showed that serum PTH level at diagnosis was associated with risk factors and clinical outcome in MM patients, especially in complete remission group, transplantation cases, ISS stage II cases, and cases without chromosome abnormality. In conclusion, this study showed that blood PTH level in MM at diagnosis was associated with risk factors and clinical outcome in MM patients.

Won, Eun-Jeong; Kim, Hye-Ran; Choi, Hyun-Jung; Park, Hye-Ri; Shin, Jong-Hee; Suh, Soon-Pal; Ryang, Dong-Wook; Shin, Myung-Geun

2014-01-01

356

GSK3-mediated MAF phosphorylation in multiple myeloma as a potential therapeutic target  

PubMed Central

Multiple myeloma (MM) is an incurable haematological malignancy characterised by the proliferation of mature antibody-secreting plasma B cells in the bone marrow. MM can arise from initiating translocations, of which the musculoaponeurotic fibrosarcoma (MAF) family is implicated in ?5%. MMs bearing Maf translocations are of poor prognosis. These translocations are associated with elevated Maf expression, including c-MAF, MAFB and MAFA, and with t(14;16) and t(14;20) translocations, involving c-MAF and MAFB, respectively. c-MAF is also overexpressed in MM through MEK/ERK activation, bringing the number of MMs driven by the deregulation of a Maf gene close to 50%. Here we demonstrate that MAFB and c-MAF are phosphorylated by the Ser/Thr kinase GSK3 in human MM cell lines. We show that LiCl-induced GSK3 inhibition targets these phosphorylations and specifically decreases proliferation and colony formation of Maf-expressing MM cell lines. Interestingly, bortezomib induced stabilisation of Maf phosphorylation, an observation that could explain, at least partially, the low efficacy of bortezomib for patients carrying Maf translocations. Thus, GSK3 inhibition could represent a new therapeutic approach for these patients.

Herath, N I; Rocques, N; Garancher, A; Eychene, A; Pouponnot, C

2014-01-01

357

The Therapeutic Potential of HDAC Inhibitors in the Treatment of Multiple Sclerosis  

PubMed Central

Multiple sclerosis (MS) is a devastating autoimmune disorder of the central nervous system (CNS) for which there is no efficacious cure. Thanks to numerous preclinical and clinical studies, drugs able to mitigate the inexorable course of the disease have been made available recently. Still, there is a terrible need for compounds capable of reducing the severity of the autoimmune attack and of blocking progression of the disorder. Also, besides the classic immunosuppressive strategies, it is now appreciated that compounds directly targeting neuronal death can be of relevance to the treatment of MS patients. Acetylation homeostasis is a key regulator of both immune cell activation and neuronal survival. Of note, potent histone deacetylase inhibitors (HDACi) endowed with antiinflammatory and neuroprotective properties have been identified. Efficacy of HDACi in experimental models of MS has been reported consistently. In this review, we provide an appraisal of the literature on HDACi and MS, also discussing the mechanisms by which HDACi can suppress the autoimmune attack to the CNS.

Faraco, Giuseppe; Cavone, Leonardo; Chiarugi, Alberto

2011-01-01

358

Exome analysis resolves differential diagnosis of familial kidney disease and uncovers a potential confounding variant.  

PubMed

A girl aged 6 presented with haematuria and her sister (aged 5) presented with haematuria and proteinuria. Family history showed multiple individuals suffering from end stage renal failure from the paternal side of the pedigree. Following kidney biopsy in the father and paternal grandmother, the pathological diagnosis was of focal segmental glomerulosclerosis (FSGS). Exome sequencing was undertaken in the proband's sister and grandmother. Genetic variants shared by both affected individuals were interrogated to identify the genetic cause of disease. Candidate variants were then sequenced in all the family members to determine segregation with the disease. A mutation of COL4A5 known to cause Alport syndrome segregated with disease from the paternal side of the pedigree and a variant in NPHS1 was present in both paediatric cases and inherited from their mother. This study highlights the advantages of exome sequencing over single gene testing; disease presentation can be heterogeneous with several genes representing plausible candidates; candidate gene(s) may be unavailable as a diagnostic test; consecutive, single gene testing typically concludes once a single causal mutation is identified. In this family, we were able to confirm a diagnosis of Alport syndrome, which will facilitate testing in other family members. PMID:24472419

Gibson, Jane; Gilbert, Rodney D; Bunyan, David J; Angus, Elizabeth M; Fowler, Darren J; Ennis, Sarah

2013-12-01

359

An investigation of the differential effect of self-generation to improve learning and memory in multiple sclerosis and traumatic brain injury  

Microsoft Academic Search

The generation effect (GE) is a phenomenon in which material that is produced by an individual is learned and remembered better than information that is provided to that individual. The current study examined the potential benefits of self-generation on learning and memory in individuals with traumatic brain injury (TBI) and multiple sclerosis (MS). The impact of cognitive impairment on the

Amanda Obrien; Nancy Chiaravalloti; Juan Carlos Arango-Lasprilla; Jeannie Lengenfelder

2007-01-01

360

Evaluation of the cytotoxic and inflammatory potential of differentially shaped zinc oxide nanoparticles.  

PubMed

Zinc oxide (ZnO) nanoparticles have wide-ranging applications in a diverse array of industrial and consumer products, from ceramic manufacture and paint formulation to sunscreens and haircare products. Hence, it is imperative to rigorously characterize the health and safety aspects of human exposure to ZnO nanoparticles. This study therefore evaluated the cellular association, cytotoxic and inflammatory potential of spherical and sheet-shaped ZnO nanoparticles (of approximately the same specific surface area ?30 cm²/g) on mouse and human cell lines (RAW-264.7 and BEAS-2B respectively), as well as with primary cultures of mouse bone marrow-derived dendritic cells (DC). The WST-8 assay demonstrated dose-dependent effects on the cytotoxicity of spherical and sheet-shaped ZnO nanoparticles on both RAW-264.7 and BEAS-2B cells, even though there was no significant effect of shape on the cytotoxicity of ZnO nanoparticles. There was however higher cellular association of spherical versus sheet-shaped ZnO nanoparticles. Measurement of reactive oxygen species (ROS) with the 2',7'-dichlorfluorescein-diacetate (DCFH-DA) assay indicated up to 4-folds increase in ROS level upon exposure to ZnO nanoparticles, but there was again no significant difference between both ZnO nanoparticle shapes. Exposure of primary dendritic cells to ZnO nanoparticles upregulated expression of CD80 and CD86 (well-known markers of DC activation and maturation) and stimulated release of pro-inflammatory cytokines--IL-6 and TNF-?, thus pointing to the potential of ZnO nanoparticles in inducing inflammation. Hence, our study indicated that ZnO nanoparticles can have potential detrimental effects on cells even at dosages where there are little or no observable cytotoxic effects. PMID:21656222

Heng, Boon Chin; Zhao, Xinxin; Tan, Eng Chok; Khamis, Nurulain; Assodani, Aarti; Xiong, Sijing; Ruedl, Christiane; Ng, Kee Woei; Loo, Joachim Say-Chye

2011-12-01

361

Stem Cell-Like Differentiation Potentials of Endometrial Side Population Cells as Revealed by a Newly Developed In Vivo Endometrial Stem Cell Assay  

PubMed Central

Background Endometrial stem/progenitor cells contribute to the cyclical regeneration of human endometrium throughout a woman's reproductive life. Although the candidate cell populations have been extensively studied, no consensus exists regarding which endometrial population represents the stem/progenitor cell fraction in terms of in vivo stem cell activity. We have previously reported that human endometrial side population cells (ESP), but not endometrial main population cells (EMP), exhibit stem cell-like properties, including in vivo reconstitution of endometrium-like tissues when xenotransplanted into immunodeficient mice. The reconstitution efficiency, however, was low presumably because ESP cells alone could not provide a sufficient microenvironment (niche) to support their stem cell activity. The objective of this study was to establish a novel in vivo endometrial stem cell assay employing cell tracking and tissue reconstitution systems and to examine the stem cell properties of ESP through use of this assay. Methodology/Principal Findings ESP and EMP cells isolated from whole endometrial cells were infected with lentivirus to express tandem Tomato (TdTom), a red fluorescent protein. They were mixed with unlabeled whole endometrial cells and then transplanted under the kidney capsule of ovariectomized immunodeficient mice. These mice were treated with estradiol and progesterone for eight weeks and nephrectomized. All of the grafts reconstituted endometrium-like tissues under the kidney capsules. Immunofluorescence revealed that TdTom-positive cells were significantly more abundant in the glandular, stromal, and endothelial cells of the reconstituted endometrium in mice transplanted with TdTom-labeled ESP cells than those with TdTom-labeled EMP cells. Conclusions/Significance We have established a novel in vivo endometrial stem cell assay in which multi-potential differentiation can be identified through cell tracking during in vivo endometrial tissue reconstitution. Using this assay, we demonstrated that ESP cells differentiated into multiple endometrial lineages in the niche provided by whole endometrial cells, indicating that ESP cells are genuine endometrial stem/progenitor cells.

Miyazaki, Kaoru; Maruyama, Tetsuo; Masuda, Hirotaka; Yamasaki, Akiko; Uchida, Sayaka; Oda, Hideyuki; Uchida, Hiroshi; Yoshimura, Yasunori

2012-01-01

362

Equine mesenchymal stem cells from bone marrow, adipose tissue and umbilical cord: immunophenotypic characterization and differentiation potential  

PubMed Central

Introduction Studies with mesenchymal stem cells (MSCs) are increasing due to their immunomodulatory, anti-inflammatory and tissue regenerative properties. However, there is still no agreement about the best source of equine MSCs for a bank for allogeneic therapy. The aim of this study was to evaluate the cell culture and immunophenotypic characteristics and differentiation potential of equine MSCs from bone marrow (BM-MSCs), adipose tissue (AT-MSCs) and umbilical cord (UC-MSCs) under identical in vitro conditions, to compare these sources for research or an allogeneic therapy cell bank. Methods The BM-MSCs, AT-MSCs and UC-MSCs were cultured and evaluated in vitro for their osteogenic, adipogenic and chondrogenic differentiation potential. Additionally, MSCs were assessed for CD105, CD44, CD34, CD90 and MHC-II markers by flow cytometry, and MHC-II was also assessed by immunocytochemistry. To interpret the flow cytometry results, statistical analysis was performed using ANOVA. Results The harvesting and culturing procedures of BM-MSCs, AT-MSCs and UC-MSCs were feasible, with an average cell growth until the third passage of 25 days for BM-MSCs, 15 days for AT-MSCs and 26 days for UC-MSCs. MSCs from all sources were able to differentiate into osteogenic (after 10 days for BM-MSCs and AT-MSCs and 15 days for UC-MSCs), adipogenic (after 8 days for BM-MSCs and AT-MSCs and 15 days for UC-MSCs) and chondrogenic (after 21 days for BM-MSCs, AT-MSCs and UC-MSCs) lineages. MSCs showed high expression of CD105, CD44 and CD90 and low or negative expression of CD34 and MHC-II. The MHC-II was not detected by immunocytochemistry techniques in any of the MSCs studied. Conclusions The BM, AT and UC are feasible sources for harvesting equine MSCs, and their immunophenotypic and multipotency characteristics attained minimal criteria for defining MSCs. Due to the low expression of MHC-II by MSCs, all of the sources could be used in clinical trials involving allogeneic therapy in horses. However, the BM-MSCs and AT-MSCs showed fastest ‘‘in vitro’’ differentiation and AT-MSCs showed highest cell growth until third passage. These findings suggest that BM and AT may be preferable for cell banking purposes.

2014-01-01

363

Potential application of hydrolyzed fish collagen for inducing the multidirectional differentiation of rat bone marrow mesenchymal stem cells.  

PubMed

Hydrolyzed fish collagen (HFC) has recently attracted considerable attention because of its outstanding bioactivity. However, few studies have been performed to determine the biological effects of HFC on bone marrow mesenchymal stem cells (BMSCs), which are often used in regenerative medicine. In this study, the molecular weight, amino acid composition, and contact angle of HFC were measured. The influence of HFC on cell viability and the multidirectional differentiation of BMSCs into osteogenic, endothelial, adipogenic, chondrogenic, and neural lineages were also assessed. Furthermore, the mechanism by which HFC promotes osteogenesis was investigated at the protein level. The molecular weight of HFC ranged from 700 to 1300 Da, the contact angle of HFC was approximately 26°, and HFC was found to be composed of various amino acids, including glycine, proline, and hydroxyproline. At a concentration of 0.2 mg/mL, HFC promoted cell viability, and significantly up-regulated the expression of osteogenic markers (RUNX2, ALP, OPN, and OCN), as well as endothelial markers (CD31, VE-cadherin, and VEGFR2). Western blot results indicated that treatment of BMSCs with 0.2 mg/mL HFC could activate the MAPK/ERK signaling pathway and then increase the protein level of RUNX2, while treatment with PD98059, a specific inhibitor of ERK1/2, could significantly inhibit the expression of P-ERK and RUNX2. Interestingly, real-time PCR demonstrated that HFC inhibited the expression of adipogenic markers (LPL and ADFP) and chondrogenic markers (aggrecan and COLII), whereas it had no effect on neural differentiation markers (MAP2 and ?3-tubulin). In summary, this study suggests that without the use of any additional inducing reagent, HFC has the potential to actively promote osteogenic and endothelial differentiation because of its high hydrophilicity and the optimal extracellular microenvironment supplied by its amino acids. This research also revealed that HFC inhibited adipogenic and chondrogenic differentiation, but it had no influence on the neural differentiation of rat bone marrow mesenchymal stem cells (rBMSCs). PMID:24359018

Liu, Chao; Sun, Jiao

2014-01-13

364

Erythropoietin is involved in the angiogenic potential of bone marrow macrophages in multiple myeloma.  

PubMed

Erythropoietin (Epo) is the crucial cytokine regulator of red blood cell production, and recombinant human erythropoietin (rHuEpo) is widely used in clinical practice for the treatment of anemia, primarily in kidney disease and in cancer. Increasing evidence suggests several biological roles for Epo and its receptor, Epo-R, unrelated to erythropoiesis, including angiogenesis. Epo-R has been found expressed in various non-haematopoietic cells and tissues, and in cancer cells. Here, we detected the expression of Epo-R in bone marrow-derived macrophages (BMMAs) from multiple myeloma (MM) and monoclonal gammopathy of undetermined significance (MGUS) patients and assessed whether Epo/Epo-R axis plays a role in MM macrophage-mediated angiogenesis. We found that Epo-R is over-expressed in BMMAs from MM patients with active disease compared to MGUS patients. The treatment of BMMAs with rHuEpo significantly increased the expression and secretion of key pro-angiogenic mediators, such as vascular endothelial growth factor, hepatocyte growth factor and monocyte chemotactic protein (MCP-1/CCL-2), through activation of JAK2/STAT5 and PI3 K/Akt pathways. In addition, the conditioned media harvested from rHuEpo-treated BMMAs enhanced bone marrow-derived endothelial cell migration and capillary morphogenesis in vitro, and induced angiogenesis in the chorioallantoic membrane of chick embryos in vivo. Furthermore, we found an increase in the circulating levels of several pro-angiogenic cytokines in serum of MM patients with anemia under treatment with Epo. Our findings highlight the direct effect of rHuEpo on macrophage-mediated production of pro-angiogenic factors, suggesting that Epo/Epo-R pathway may be involved in the regulation of angiogenic response occurring in MM. PMID:23881169

De Luisi, Annunziata; Binetti, Laura; Ria, Roberto; Ruggieri, Simona; Berardi, Simona; Catacchio, Ivana; Racanelli, Vito; Pavone, Vincenzo; Rossini, Bernardo; Vacca, Angelo; Ribatti, Domenico

2013-10-01

365

Coinhibitory molecule PD-1 as a potential target for the immunotherapy of multiple myeloma.  

PubMed

The adaptive immune system is clearly capable of recognizing and attacking malignant plasma cells in patients with multiple myeloma (MM). However, MM patients evidence severe defects of humoral and cellular immunity, and it is likely that the profound immune dysregulation typical for this malignancy contributes to its eventual escape from natural immune control. One of the factors responsible for the immune dysfunction in MM might be the programmed death 1 (PD-1) protein. The physiological role of PD-1 is to guarantee T-cell homeostasis by limiting T-cell activation and proliferation. Accordingly, binding of the ligand PD-L1 to PD-1 expressed on the surface of activated T cells delivers an inhibitory signal, reducing cytokine production and proliferation. Using the same mechanism, PD-L1/PD-1 interactions have been shown in a number of animal models to confer tumor escape from immune control. Recently, clinical trials have suggested a significant therapeutic impact of PD-1/PD-L inhibition on a variety of solid tumors-for example, by the application of monoclonal antibodies. We show here that based on (1) the broad expression of PD-1 and its ligands in the microenvironment of myeloma, (2) data indicating an important role of the PD-1 pathway in the immune evasion by MM cells and (3) preclinical results providing a strong rationale for therapeutic PD-1/PD-L inhibition in this malignancy, MM may be very well suited for immunotherapy, for example, a monoclonal antibody, targeting PD-1 and/or its ligands. PMID:24153012

Atanackovic, D; Luetkens, T; Kröger, N

2014-05-01

366

Impairment of heme synthesis in myelin as potential trigger of multiple sclerosis.  

PubMed

The pathogenesis of multiple sclerosis (MS), a disease characterized by demyelination and subsequent axonal degeneration, is as yet unknown. Also, the nature of the disease is as yet not established, since doubts have been cast on its autoimmune origin. Genetic and environmental factors have been implied in MS, leading to the idea of an overall multifactorial origin. An unexpected role in energizing the axon has been reported for myelin, supposed to be the site of consumption of most of oxygen in brain. Myelin would be able to perform oxidative phosphorylation to supply the axons with ATP, thanks to the expression therein of mitochondrial F(o)F(1)-ATP synthase, and respiratory chains. Interestingly, myelin expresses the pathway of heme synthesis, hence of cytochromes, that rely on heme group, in turn depending on Fe availability. Poisoning by these pollutants shares the common characteristic to bring about demyelination both in animal models and in man. Carbon monoxide (CO) and lead poisoning which cause functional imbalance of the heme group, as well as of heme synthesis, cause myelin damage. On the other hand, a lack of essential metals such as iron and copper, produces dramatic myelin decrease. Myelin is a primary target, of iron shortage, indicating that in myelin Fe-dependent processes are more active than in other tissues. The predominant spread of MS in industrialized countries where pollution by heavy metals, and CO poisoning is widespread, suggests a relationship among toxic action of metal pollutants and MS. According to the present hypothesis, MS can be primarily triggered by environmental factors acting on a genetic susceptibility, while the immune response may be a consequence of a primary oxidative damage due to reactive oxygen species produced consequently to an imbalance of cytochromes and respiratory chains in the sheath. PMID:22398388

Morelli, Alessandro; Ravera, Silvia; Calzia, Daniela; Panfoli, Isabella

2012-06-01

367

Shrub Encroachment Impacts the Potential for Multiple Use Conflicts on Public Land  

NASA Astrophysics Data System (ADS)

Public rangelands in North America are typically managed under a multiple use policy that includes livestock grazing and wildlife management. In this article we report on the landscape level extent of grassland loss to shrub encroachment in a portion of the Rocky Mountain Forest Reserve in southwestern Alberta, Canada, and review the associated implications for simultaneously supporting livestock and wildlife populations while maintaining range health on this diminishing vegetation type. Digitized aerial photographs of 12 km of valley bottom from 1958 and 1974 were co-registered to ortho-rectified digital imagery taken in 1998, and an un-supervised classification used to determine areas associated with grassland and shrubland in each year. Field data from 2002 were over-layed using GPS coordinates to refine the classification using a calibration-validation procedure. Over the 40-year study period, open grasslands declined from 1,111 ha in 1958 to 465 ha in 1998, representing a 58% decrease. Using mean production data for grass and shrub dominated areas we then quantified aggregate changes in grazing capacity of both primary (grassland) and secondary (shrubland) habitats for livestock and wildlife. Total declines in grazing capacity from 1958 to 1998 totaled 2,744 Animal Unit Months (AUMs) of forage (-39%), including a 58% decrease in primary (i.e., open grassland) range, which was only partly offset by the availability of 1,357 AUMs within less productive and less accessible shrubland habitats. Our results indicate shrub encroachment has been extensive and significantly reduced forage availability to domestic livestock and wildlife, and will increase the difficulty of conserving remaining grasslands. Although current grazing capacities remain marginally above those specified by regulated grazing policies, it is clear that continued habitat change and decreases in forage availability are likely to threaten the condition of remaining grasslands. Unless shrub encroachment is arrested or grassland restoration initiated, reductions in aggregate ungulate numbers may be necessary.

Burkinshaw, Angela M.; Bork, Edward W.

2009-09-01

368

Multiple feedback regulatory loops upon rat hypothalamic corticotropin-releasing hormone secretion. Potential clinical implications.  

PubMed Central

To examine whether the hypothalamic corticotropin-releasing hormone (CRH) neuron is regulated by CRH, by products of the proopiomelanocortin (POMC) gene, and/or by glucocorticoids, we used a rat hypothalamic organ culture system in which rat CRH secretion from single explanted hypothalami was evaluated by an RIA (iCRH) specific for rat CRH. The effects of graded concentrations of ovine CRH (oCRH), adrenocorticotropin hormone (ACTH), beta-endorphin (beta-EP), alpha-melanocyte-stimulating hormone (alpha-MSH), corticotropin-like intermediate lobe peptide (CLIP), ovine beta-lipotropin (ovine beta-LPH), and dexamethasone (DEX) upon unstimulated and serotonin- (5HT), acetylcholine- (ACh), and norepinephrine-(NE) stimulated CRH secretion were determined. oCRH and DEX inhibited unstimulated iCRH secretion with ID50 at the 10(-8) M range. ACTH had no detectable suppressive effect at 10(-8) M. oCRH, ACTH, and DEX inhibited 5HT-, ACh-, and NE-stimulated iCRH secretion in a dose-dependent fashion. beta-EP, alpha-MSH, and CLIP also inhibited 5HT-induced iCRH secretion. Of the latter peptides, the strongest inhibitor was beta-EP and the weakest was CLIP. Ovine beta-LPH had only a weak inhibitory effect on 5HT-induced iCRH secretion. Generally, the concentrations required for 50% suppression of neurotransmitter-stimulated iCRH secretion were significantly lower than those required for a similar suppression of unstimulated iCRH secretion. In conclusion, these data suggest the presence of multiple negative feedback loops involved in the regulation of the hypothalamic CRH neuron: an ultrashort CRH-mediated loop, a short, hypothalamic POMC-derived peptide loop, and a long, glucocorticoid-mediated negative feedback loop. The potency of these negative feedback loops may be determined by the state of activation of the CRH neuron.

Calogero, A E; Gallucci, W T; Gold, P W; Chrousos, G P

1988-01-01

369

Differing immunogenic potentials of interferon beta preparations in multiple sclerosis patients.  

PubMed

Interferon beta (IFNbeta) is a first-line therapy for multiple sclerosis (MS). However, some patients experience a decline in efficacy with continued therapy due to the development of anti-IFNbeta neutralizing antibodies (NAb). We investigated the frequency of NAb cross-sectionally in 846 MS patients who were receiving IFNbeta-1b, IFNbeta-1a im, or IFNbeta-1a sc. The frequency of NAb in patients receiving IFNbeta-1a im was lower (5%) than in patients treated with any other form of IFNbeta (22-35%) (P < 0.0001). Binding antibodies (BAb) were measured in 808 patients. The frequency differed significantly between treatment groups, ranging from 45% (IFNbeta-1a im) to 88% (IFNbeta-1b). The proportion of NAb-positive patients within the BAb-positive group differed significantly among treatment groups, ranging between 12% (IFNbeta-1a im) and 51% (IFNbeta-1a sc). The median NAb titer from all IFNbeta-1a-treated patients was higher than from IFNbeta-1b-treated patients (446 versus 171 NU/ mL, P = 0.04). Among NAb-positive patients, the frequency of NAb titers > 100 NU/mL was 71% for IFNbeta-1a compared with 58% for IFNbeta-1b (P = 0.04). Except for conflicting data regarding IFNbeta-1a sc, the results are generally consistent with the literature and together with the differing proportion of NAb-positive patients within the BAb-positive group, provide further insight into the immunogenicity of the IFNbeta preparations. PMID:17263000

Gneiss, C; Tripp, P; Reichartseder, F; Egg, R; Ehling, R; Lutterotti, A; Khalil, M; Kuenz, B; Mayringer, I; Reindl, M; Berger, T; Deisenhammer, F

2006-12-01

370

The Potential of TaqMan Array Cards for Detection of Multiple Biological Agents by Real-Time PCR  

PubMed Central

The TaqMan Array Card architecture, normally used for gene expression studies, was evaluated for its potential to detect multiple bacterial agents by real-time PCR. Ten PCR assays targeting five biological agents (Bacillus anthracis, Burkholderia mallei, Burkholderia pseudomallei, Francisella tularensis, and Yersinia pestis) were incorporated onto Array Cards. A comparison of PCR performance of each PCR in Array Card and singleplex format was conducted using DNA extracted from pure bacterial cultures. When 100 fg of agent DNA was added to Array Card channels the following levels of agent detection (where at least one agent PCR replicate returned a positive result) were observed: Y. pestis 100%, B. mallei & F. tularensis 93%; B. anthracis 71%; B. pseudomallei 43%. For B. mallei & pseudomallei detection the BPM2 PCR, which detects both species, outperformed PCR assays specific to each organism indicating identification of the respective species would not be reproducible at the 100 fg level. Near 100% levels of detection were observed when 100 fg of DNA was added to each PCR in singleplex format with singleplex PCRs also returning sporadic positives at the 10 fg per PCR level. Before evaluating the use of Array Cards for the testing of environmental and clinical sample types, with potential levels of background DNA and PCR inhibitors, users would therefore have to accept a 10-fold reduction in sensitivity of PCR assays on the Array Card format, in order to benefit for the capacity to test multiple samples for multiple agents. A two PCR per agent strategy would allow the testing of 7 samples for the presence of 11 biological agents or 3 samples for 23 biological agents per card (with negative control channels).

Rachwal, Phillip A.; Rose, Helen L.; Cox, Victoria; Lukaszewski, Roman A.; Murch, Amber L.; Weller, Simon A.

2012-01-01

371

Differential distributions of mononucleotide repeat sequences in 256 viral genomes and its potential implications.  

PubMed

Mononucleotide repeats (MNRs) have been systematically investigated in the genomes of eukaryotic and prokaryotic organisms. However, detailed information on the distribution of MNRs in viral genomes is limited. In this study, we examined the distributions of MNRs in 256 fully sequenced virus genomes which showed extensive variations across viral genomes, and is significantly influenced by both genome size and CG content. Furthermore, the ratio of the observed to the expected number of MNRs (O/E ratio) appears to be influenced by both the host range and genome type of a particular virus. Additionally, the densities and frequencies of MNRs in genic regions are lower than in non-coding regions, suggesting that selective pressure acts on viral genomes. We also discuss the potential functional roles that these MNR loci could play in virus genomes. To our knowledge, this is the first analysis focusing on MNRs in viruses, and our study could have potential implications for a deeper understanding of virus genome stability and the co-evolution that occurs between a virus and its host. PMID:24786215

Qin, Lü; Ma, Yuxin; Liang, Pengbo; Tan, Zhongyang; Li, Shifang

2014-07-10

372

Differential maturation of brainstem auditory evoked potentials in preterm infants according to birthweight.  

PubMed

Brainstem auditory evoked potentials (BAEPs) were recorded from 39 preterm infants, divided into 3 groups: small-for-gestational-age, with a birthweight less than or equal to 1500 g (SGA); appropriate-for-gestational-age, with a birthweight less than or equal to 1500 g (AGA1); and appropriate-for-gestational-age, with a birthweight higher than 1500 g (AGA2). A significant shortening of the I-V interval due to an increase in wave I latency was found in the SGA group. The lower-weight AGA group (AGA1) was never significantly different from the SGA group. Although there was no correlation between conceptional age and weight at the time of the examination for the studied population, negative correlations were found between wave I latency and weight at the time of the examination. These findings confirm previous research and suggest the existence of a link between weight and basal cochlear maturation. PMID:1342046

Soares, I; Collet, L; Desreux, V; Morgon, A; Salle, B

1992-01-01

373

Potential role of multiple carbon fixation pathways during lipid accumulation in Phaeodactylum tricornutum  

PubMed Central

Background Phaeodactylum tricornutum is a unicellular diatom in the class Bacillariophyceae. The full genome has been sequenced (<30?Mb), and approximately 20 to 30% triacylglyceride (TAG) accumulation on a dry cell basis has been reported under different growth conditions. To elucidate P. tricornutum gene expression profiles during nutrient-deprivation and lipid-accumulation, cell cultures were grown with a nitrate to phosphate ratio of 20:1 (N:P) and whole-genome transcripts were monitored over time via RNA-sequence determination. Results The specific Nile Red (NR) fluorescence (NR fluorescence per cell) increased over time; however, the increase in NR fluorescence was initiated before external nitrate was completely exhausted. Exogenous phosphate was depleted before nitrate, and these results indicated that the depletion of exogenous phosphate might be an early trigger for lipid accumulation that is magnified upon nitrate depletion. As expected, many of the genes associated with nitrate and phosphate utilization were up-expressed. The diatom-specific cyclins cyc7 and cyc10 were down-expressed during the nutrient-deplete state, and cyclin B1 was up-expressed during lipid-accumulation after growth cessation. While many of the genes associated with the C3 pathway for photosynthetic carbon reduction were not significantly altered, genes involved in a putative C4 pathway for photosynthetic carbon assimilation were up-expressed as the cells depleted nitrate, phosphate, and exogenous dissolved inorganic carbon (DIC) levels. P. tricornutum has multiple, putative carbonic anhydrases, but only two were significantly up-expressed (2-fold and 4-fold) at the last time point when exogenous DIC levels had increased after the cessation of growth. Alternative pathways that could utilize HCO3- were also suggested by the gene expression profiles (e.g., putative propionyl-CoA and methylmalonyl-CoA decarboxylases). Conclusions The results indicate that P. tricornutum continued carbon dioxide reduction when population growth was arrested and different carbon-concentrating mechanisms were used dependent upon exogenous DIC levels. Based upon overall low gene expression levels for fatty acid synthesis, the results also suggest that the build-up of precursors to the acetyl-CoA carboxylases may play a more significant role in TAG synthesis rather than the actual enzyme levels of acetyl-CoA carboxylases per se. The presented insights into the types and timing of cellular responses to inorganic carbon will help maximize photoautotrophic carbon flow to lipid accumulation.

2012-01-01

374

Exploring transcriptional signalling mediated by OsWRKY13, a potential regulator of multiple physiological processes in rice  

PubMed Central

Background Rice transcription regulator OsWRKY13 influences the functioning of more than 500 genes in multiple signalling pathways, with roles in disease resistance, redox homeostasis, abiotic stress responses, and development. Results To determine the putative transcriptional regulation mechanism of OsWRKY13, the putative cis-acting elements of OsWRKY13-influenced genes were analyzed using the whole genome expression profiling of OsWRKY13-activated plants generated with the Affymetrix GeneChip Rice Genome Array. At least 39 transcription factor genes were influenced by OsWRKY13, and 30 of them were downregulated. The promoters of OsWRKY13-upregulated genes were overrepresented with W-boxes for WRKY protein binding, whereas the promoters of OsWRKY13-downregulated genes were enriched with cis-elements putatively for binding of MYB and AP2/EREBP types of transcription factors. Consistent with the distinctive distribution of these cis-elements in up- and downregulated genes, nine WRKY genes were influenced by OsWRKY13 and the promoters of five of them were bound by OsWRKY13 in vitro; all seven differentially expressed AP2/EREBP genes and six of the seven differentially expressed MYB genes were suppressed by in OsWRKY13-activated plants. A subset of OsWRKY13-influenced WRKY genes were involved in host-pathogen interactions. Conclusion These results suggest that OsWRKY13-mediated signalling pathways are partitioned by different transcription factors. WRKY proteins may play important roles in the monitoring of OsWRKY13-upregulated genes and genes involved in pathogen-induced defence responses, whereas MYB and AP2/EREBP proteins may contribute most to the control of OsWRKY13-downregulated genes.

2009-01-01

375

Endometrial cancer side-population cells show prominent migration and have a potential to differentiate into the mesenchymal cell lineage.  

PubMed

Cancer stem-like cell subpopulations, referred to as "side-population" (SP) cells, have been identified in several tumors based on their ability to efflux the fluorescent dye Hoechst 33342. Although SP cells have been identified in the normal human endometrium and endometrial cancer, little is known about their characteristics. In this study, we isolated and characterized the SP cells in human endometrial cancer cells and in rat endometrial cells expressing oncogenic human K-Ras protein. These SP cells showed i) reduction in the expression levels of differentiation markers; ii) long-term proliferative capacity of the cell cultures; iii) self-renewal capacity in vitro; iv) enhancement of migration, lamellipodia, and uropodia formation; and v) enhanced tumorigenicity. In nude mice, SP cells formed large, invasive tumors, which were composed of both tumor cells and stromal-like cells with enriched extracellular matrix. The expression levels of vimentin, alpha-smooth muscle actin, and collagen III were enhanced in SP tumors compared with the levels in non-SP tumors. In addition, analysis of microdissected samples and fluorescence in situ hybridization of Hec1-SP-tumors showed that the stromal-like cells with enriched extracellular matrix contained human DNA, confirming that the stromal-like cells were derived from the inoculated cells. Moreober, in a Matrigel assay, SP cells differentiated into alpha-smooth muscle actin-expressing cells. These findings demonstrate that SP cells have cancer stem-like cell features, including the potential to differentiate into the mesenchymal cell lineage. PMID:20008133

Kato, Kiyoko; Takao, Tomoka; Kuboyama, Ayumi; Tanaka, Yoshihiro; Ohgami, Tatsuhiro; Yamaguchi, Shinichiro; Adachi, Sawako; Yoneda, Tomoko; Ueoka, Yousuke; Kato, Keiji; Hayashi, Shinichi; Asanoma, Kazuo; Wake, Norio

2010-01-01

376

EGFR and Notch signaling respectively regulate proliferative activity and multiple cell lineage differentiation of Drosophila gastric stem cells.  

PubMed

Quiescent, multipotent gastric stem cells (GSSCs) in the copper cell region of adult Drosophila midgut can produce all epithelial cell lineages found in the region, including acid-secreting copper cells, interstitial cells and enteroendocrine cells, but mechanisms controlling their quiescence and the ternary lineage differentiation are unknown. By using cell ablation or damage-induced regeneration assays combined with cell lineage tracing and genetic analysis, here we demonstrate that Delta (Dl)-expressing cells in the copper cell region are the authentic GSSCs that can self-renew and continuously regenerate the gastric epithelium after a sustained damage. Lineage tracing analysis reveals that the committed GSSC daughter with activated Notch will invariably differentiate into either a copper cell or an interstitial cell, but not the enteroendocrine cell lineage, and loss-of-function and gain-of-function studies revealed that Notch signaling is both necessary and sufficient for copper cell/interstitial cell differentiation. We also demonstrate that elevated epidermal growth factor receptor (EGFR) signaling, which is achieved by the activation of ligand Vein from the surrounding muscle cells and ligand Spitz from progenitor cells, mediates the regenerative proliferation of GSSCs following damage. Taken together, we demonstrate that Dl is a specific marker for Drosophila GSSCs, whose cell cycle status is dependent on the levels of EGFR signaling activity, and the Notch signaling has a central role in controlling cell lineage differentiation from GSSCs by separating copper/interstitial cell lineage from enteroendocrine cell lineage. PMID:24603358

Wang, Chenhui; Guo, Xingting; Xi, Rongwen

2014-05-01

377

Linking potential denitrification rates to microbial gene abundances in multiple boreal ecosystems  

NASA Astrophysics Data System (ADS)

The composition and functioning of boreal ecosystems are vulnerable to changes in climate, leading to changes in season length, fire regimes, and soil moisture status. To investigate the influence of vegetation and soil moisture on microbial nitrogen cycling several disparate boreal ecosystems was studied. The two primary objectives were to: (1) determine whether process rates could be predicted solely from soil physical and chemical characteristics and (2) determine if the abundance of functional genes could be an additional explanatory variable. Surface soils were sampled along an elevation-driven hydrologic gradient at the Bonanza Creek LTER that corresponds with five plant communities typical of interior Alaska. The plant communities included a black spruce stand, a deciduous stand, a tussock grassland, an emergent fen, and a rich fen. We examined the chemical composition of the surface organic moss and soil, measured gross N-mineralization, potential rates of nitrification and denitrification (DEA), and abundances of several functional groups of microorganisms from soil cores collected in mid summer. We used quantitative PCR to assess the gene abundances of ammonia oxidizers and denitrifiers based on a functional gene approach. Here, we focus on potential denitrification rates (PDR), and abundance of denitrifyers carrying NirS and NirK genes (nitrate reductase) and NosZ genes (nitrous oxide reductase). PDR increased dramatically with increasing soil moisture along the gradient, from 1 mg N/m2/h at the dry black spruce site to 300 mg N/m2/h in the rich fen, which is very high compared to other poorly drained soil environments. PDR were linearly related to the abundance of functional genes from the microorganisms responsible for this process. Abundances of NirS, NirK and NosZ genes correlated significantly to PDR (r2 = 0.61 p < 0.0001, r2 = 0.45 p < 0.0003, r2 = 0.81 p < 0.0001, respectively). In addition, PDR were better explained by functional gene abundances than by other biophysical data (e.g. soil moisture, soil temperature, soil C, soil N). This study demonstrates that rates of PDR are strongly affected by the moisture regime, and qPCR is a robust tool for understanding linkages between microbial populations and biogeochemical process rates. Quantitative analyses of different microbial functional groups across landscapes could be established as a sensitive indicator of changes in nitrogen processing.

Petersen, D. G.; Blazewicz, S.; Herman, D. J.; Firestone, M. K.; Waldrop, M. P.

2010-12-01

378

Conserved extracellular cysteines differentially regulate the potentiation produced by Zn2+ in rat P2X4 receptors  

PubMed Central

One feature of the amino acid sequence of P2X receptors identified from mammalian species, Xenopus laevis and zebrafish is the conservation of ten cysteines in the extracellular loop. Little information is available about the role of these conserved ectodomain cysteines in the function of P2X receptors. Here, we investigated the possibility that ten conserved cysteine residues in the extracellular loop of the rat P2X4 receptor may regulate zinc potentiation of the receptor using a series of individual cysteine to alanine point mutations and functional characterization of recombinant receptors expressed in Xenopus oocytes. For the C116A, C132A, C159A, C165A, C217A and C227A mutants, 10 ?M zinc did not significantly affect the current activated by an EC40 concentration of ATP. By contrast, 5 ?M zinc shifted the ATP concentration-response curve to the right in a parallel manner for both the C261A and C270A mutants and the magnitudes of those shifts were similar to that of the wildtype receptor. Interestingly, for the C126A and C149A mutants, 5 ?M zinc potentiated ATP-activated current, but increased the maximal response to ATP by by 90% and 81% respectively, without significantly changing the EC50 value of ATP. Thus, these results suggest that cysteines and disulfide bonds between cysteines are differentially involved in the potentiation of the rat P2X4 receptor by zinc.

Li, Chao-Ying; Xiong, Ke-Ming; Wu, Yu-Xiang; Liu, Yu-Wei; Chen, Lin; Stewart, Randall R.; Peoples, Robert W.; Yi, Chu-Li

2014-01-01

379

Protective effects of bioactive phytochemicals from Mentha piperita with multiple health potentials.  

PubMed

Mentha piperita essential oil was bactericidal in order of E. coli> S. aureus > Pseudomonas aeruginosa > S. faecalis > Klebsiella pneumoniae. The oil with total phenolics of 89.43 ± 0.58 µg GAE/mg had 63.82 ± 0.05% DPPH inhibition activity with an IC (50) = 3.9 µg/ml. Lipid peroxidation inhibition was comparable to BHT and BHA. A 127% hike was noted in serum ferric-reducing antioxidant power. There was 38.3% decrease in WBCs count, while platelet count showed increased levels of 214.12%. Significant decrease in uric acid level and cholesterol/HDL and LDL/HDL ratios were recorded. The volatile oil displayed high cytotoxic action toward the human tumor cell line. The results of this study deserve attention with regard to antioxidative and possible anti-neoplastic chemotherapy that form a basis for future research. The essential oil of mint may be exploited as a natural source of bioactive phytopchemicals bearing antimicrobial and antioxidant potentials that could be supplemented for both nutritional purposes and preservation of foods. PMID:20931070

Sharafi, Seyedeh Maryam; Rasooli, Iraj; Owlia, Parviz; Taghizadeh, Massoud; Astaneh, Shakiba Darvish Alipoor

2010-07-01

380

Applied potential tomography shows differential changes in fluid content of leg tissue layers in microgravity.  

PubMed

Absence of hydrostatic forces in the human cardiocirculatory system normally leads to an overall body fluid deficit. It was hypothesized that this is mainly due to a loss of interstitial fluid. An experiment was performed on board the Russian MIR station. Cuffs were positioned around both thighs and inflated up to suprasystolic values. This maneuver took place just before and after immediately a lower body negative pressure session (LBNP). The redistribution of fluids underneath the cuffs was assessed by means of cross-sectional impedance tomography (Applied Potential Tomography, APT). A microgravity induced loss of interstitial fluid was measured in all layers of the observed cross-section. The APT-readings changed significantly (SD approximately +/- .9) from 3.0 at 1g to 1.7 at 0g for the outer layer and from 2.7 at 1g to 2.0 at 0g for the middle layer (expressed in arbitrary units). The LBNP maneuver was able to fill the interstitial space but only at levels higher than -15 mmHg LBNP. This suggests that the superficial tissues in the legs are as much affected as the deeper ones by changing g-conditions and LBNP can be used to counteract interstitial fluid loss in this area. PMID:11537940

Baisch, F J

1994-01-01

381

Differential RISC association of endogenous human microRNAs predicts their inhibitory potential  

PubMed Central

It has previously been assumed that the generally high stability of microRNAs (miRNAs) reflects their tight association with Argonaute (Ago) proteins, essential components of the RNA-induced silencing complex (RISC). However, recent data have suggested that the majority of mature miRNAs are not, in fact, Ago associated. Here, we demonstrate that endogenous human miRNAs vary widely, by >100-fold, in their level of RISC association and show that the level of Ago binding is a better indicator of inhibitory potential than is the total level of miRNA expression. While miRNAs of closely similar sequence showed comparable levels of RISC association in the same cell line, these varied between different cell types. Moreover, the level of RISC association could be modulated by overexpression of complementary target mRNAs. Together, these data indicate that the level of RISC association of a given endogenous miRNA is regulated by the available RNA targetome and predicts miRNA function.

Flores, Omar; Kennedy, Edward M.; Skalsky, Rebecca L.; Cullen, Bryan R.

2014-01-01

382

Differential RISC association of endogenous human microRNAs predicts their inhibitory potential.  

PubMed

It has previously been assumed that the generally high stability of microRNAs (miRNAs) reflects their tight association with Argonaute (Ago) proteins, essential components of the RNA-induced silencing complex (RISC). However, recent data have suggested that the majority of mature miRNAs are not,