Time filter

Source Type

Nekanti U.,Stempeutics Research Pvt. Ltd. | Rao V.B.,Stempeutics Research Pvt. Ltd. | Bahirvani A.G.,Stempeutics Research Pvt. Ltd. | Jan M.,Stempeutics Research Pvt. Ltd. | And 2 more authors.
Stem Cells and Development | Year: 2010

Mesenchymal stem cells (MSCs) with their multilineage developmental plasticity comprise a promising tool for regenerative cell-based therapy. Despite important biological properties, which the MSCs from different sources share, the differences between them are poorly understood. Hence, it is required to assign a molecular signature to each of these MSC populations, based on stem cell related genes and early lineage or developmental markers. Understanding their propensity to differentiate to different lineages is fundamental for the development of successful cell-based therapies. Culture expansion of MSCs is a prerequisite, since high absolute numbers of stem cells are required to attain a clinical dose. Here, we compared the different culture conditions for long-term expansion of human MSCs isolated from the Wharton's jelly (WJ) of the umbilical cord while preserving their stem cell characteristics and differentiation potential. We find that DMEM-KO and DMEM-F12 are superior as compared to the other media tested in supporting the in vitro expansion of the WJ-MSCs. We studied the gene expression profile of WJ and bone marrow-derived MSCs (BM-MSCs) both at early and late passages using Human Stem Cell Pluripotency Array, and our data revealed differences at the transcriptional level between the two MSC types. Compared to BM-MSCs, WJ-MSCs had higher expression of undifferentiated human embryonic stem cell (hES) markers like NANOG, DNMT3B, and GABRB3, pluripotent/stem cell markers, as well as some early endodermal markers both at early and late passages. To conclude, WJ-MSCs possess properties of true stem cells, which they retain even after extended in vitro culturing.© Mary Ann Liebert, Inc.

Venkatesan V.,National Institute of Nutrition | Chalsani M.,National Institute of Nutrition | Nawaz S.S.,National Institute of Nutrition | Bhonde R.R.,Manipal Institute of Regenerative Medicine | And 2 more authors.
Cytotechnology | Year: 2012

WNIN/Ob, a mutant rat strain, developed at the National Center for Laboratory Animal Sciences (NCLAS) facility of National Institute of Nutrition (NIN), is a new animal model to study the metabolic syndrome. These animals have 47% fat in their body and isolation of islets from these animals were compounded due to the formation of amorphous viscous and jelly like material which reduced the islet yield. However, islets isolated from WNIN adult (≥12 months) control rats gave a good islet recovery, under standard isolation procedures using collagenase digestion. In the present study we optimized culture conditions in WNIN/Ob rats to isolate islets with higher yield, and also established primary islet cell cultures from these mutant rats, retaining cellular integrity and functionality. © 2011 Springer Science+Business Media B.V.

Gupta A.K.,Molecular Biology Unit | Gupta A.K.,North West University | Rastogi G.,University of California at Davis | Rastogi G.,Wetland Research and Training Center | And 5 more authors.
Medical and Veterinary Entomology | Year: 2014

Flesh flies of the genus Sarcophaga (Diptera: Sarcophagidae) are carrion-breeding, necrophagous insects important in medical and veterinary entomology as potential transmitters of pathogens to humans and animals. Our aim was to analyse the diversity of gut-associated bacteria in wild-caught larvae and adult flesh flies using culture-dependent and culture-independent methods. Analysis of 16S rRNA gene sequences from cultured isolates and clone libraries revealed bacteria affiliated to Proteobacteria, Actinobacteria, Firmicutes and Bacteroidetes in the guts of larval and adult flesh flies. Bacteria cultured from larval and adult flesh fly guts belonged to the genera Acinetobacter, Bacillus, Budvicia, Citrobacter, Dermacoccus, Enterococcus, Ignatzschineria, Lysinibacillus, Myroides, Pasteurella, Proteus, Providencia and Staphylococcus. Phylogenetic analysis showed clone sequences of the genera Aeromonas, Bacillus, Bradyrhizobium, Citrobacter, Clostridium, Corynebacterium, Ignatzschineria, Klebsiella, Pantoea, Propionibacterium, Proteus, Providencia, Serratia, Sporosarcina, Weissella and Wohlfahrtiimonas. Species of clinically significant genera such as Ignatzschineria and Wohlfahrtiimonas spp. were detected in both larvae and adult flesh flies. Sequence analysis of 16S rRNA gene libraries supported culture-based results and revealed the presence of additional bacterial taxa. This study determined the diversity of gut microbiota in flesh flies, which will bolster the ability to assess microbiological risk associated with the presence of these flies. The present data thereby establish a platform for a much larger study. © 2014 The Royal Entomological Society.

Ahanger S.H.,National Center for Cell Science | Ahanger S.H.,Justus Liebig University | Gunther K.,Justus Liebig University | Weth O.,Justus Liebig University | And 5 more authors.
Scientific Reports | Year: 2014

Insulator mediated alteration in higher-order chromatin and/or nucleosome organization is an important aspect of epigenetic gene regulation. Recent studies have suggested a key role for CP190 in such processes. In this study, we analysed the effects of ectopically tethered insulator factors on chromatin structure and found that CP190 induces large-scale decondensation when targeted to a condensed lacO array in mammalian and Drosophila cells. In contrast, dCTCF alone, is unable to cause such a decondensation, however, when CP190 is present, dCTCF recruits it to the lacO array and mediates chromatin unfolding. The CP190 induced opening of chromatin may not be correlated with transcriptional activation, as binding of CP190 does not enhance luciferase activity in reporter assays. We propose that CP190 may mediate histone modification and chromatin remodelling activity to induce an open chromatin state by its direct recruitment or targeting by a DNA binding factor such as dCTCF. © 2014, Nature Publishing Group. All rights reserved.

Madhira S.L.,National Institute of Nutrition | Challa S.S.,National Institute of Nutrition | Chalasani M.,National Institute of Nutrition | Nappanveethl G.,National Institute of Nutrition | And 3 more authors.
PLoS ONE | Year: 2012

Background: Development of model systems have helped to a large extent, in bridging gap to understand the mechanism(s) of disease including diabetes. Interestingly, WNIN/GR-Ob rats (Mutants), established at National Centre for Laboratory Animals (NCLAS) of National Institute of Nutrition (NIN), form a suitable model system to study obesity with Type 2 diabetes (T2D) demonstrating several secondary complications (cataract, cardiovascular complications, infertility, nephropathy etc). The present study has been carried out to explore the potent application(s) of multipotent stem cells such as bone marrow mesenchymal stem cells (BM-MSCs), to portray features of pre-diabetic/T2D vis-à-vis featuring obesity, with impaired glucose tolerance (IGT), hyperinsulinemia (HI) and insulin resistance (IR) seen with Mutant rats akin to human situation. Methodology/Principal Findings: Primary cultures of BM-MSCs (third passage) from Mutants, its lean littermate (Lean) and parental control (Control) were characterized for: proliferation markers, disease memory to mark obesity/T2D/HI/IR which included phased gene expression studies for adipogenic/pancreatic lineages, inflammatory markers and differentiation ability to form mature adipocytes/Insulin-like cellular aggregates (ILCAs). The data showed that BM-MSCs from Mutant demonstrated a state of disease memory, depicted by an upregulated expression of inflammatory markers (IL-6, TNFα); increased stem cell recruitment (Oct-4, Sox-2) and proliferation rates (CD90+/CD29+, PDA, 'S' phase of cell cycle by FACS and BrdU incorporation); accelerated preadipocyte induction (Dact-1, PPARγ2) with a quantitative increase in mature adipocyte formation (Leptin); ILCAs, which were non-responsive to high glucose did confer the Obese/T2D memory in Mutants. Further, these observations were in compliance with the anthropometric data. Conclusions: Given the ease of accessibility and availability of MSCs, the present study form the basis to report for the first time, application of BM-MSCs as a feasible in vitro model system to portray the disease memory of pre-clinical/T2D with IR - a major metabolic disorder of global concern. © 2012 Madhira et al.

Discover hidden collaborations