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Hematopoietic stem cells treated with the Notch ligand Delta 4 HSC_notch_IGR

ABSTRACT: The Notch pathway regulates cell-fate decisions in a wide variety of cell types, often inhibiting particular differentiation programs and permitting either self-renewal or differentiation along alternate pathways. Notch receptors and Notch ligands have been found on hematopoietic stem cells (HSC) or marrow stromal cells. In the present study, through a microarray approach, we analyzed the gene expression variations from cultured murine HSC with or without a Notch ligand Delta4 at 6 hours, 12 hours and 24 hours after the induction of the Notch pathway. Keywords: time course

ORGANISM(S): Mus musculus Rattus norvegicus

PROVIDER: GSE5135 | GEO | 2006/06/29

SECONDARY ACCESSION(S): PRJNA96645

REPOSITORIES: GEO

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Project description:Sivakumar2011 - Notch Signaling Pathway Notch is a transmembrane receptor that mediates local cell-cell communication and coordinates a signaling cascade. It plays a key role in modulating cell fate decisions throughout the development of invertebrate and vertebrate species and the misregulation leads to a number of human diseases. References: Notch signaling: from the outside in. Notch signaling in hematopoiesis and early lymphocyte development. An overview of the Notch signalling pathway. Notch and cancer: best to avoid the ups and downs. Notch signaling: control of cell communication and cell fate. This model is described in the article: A systems biology approach to model neural stem cell regulation by notch, shh, wnt, and EGF signaling pathways. Sivakumar KC, Dhanesh SB, Shobana S, James J, Mundayoor S. Omics: a Journal of Integrative Biology. 2011; 15(10):729-737 Abstract: The Notch, Sonic Hedgehog (Shh), Wnt, and EGF pathways have long been known to influence cell fate specification in the developing nervous system. Here we attempted to evaluate the contemporary knowledge about neural stem cell differentiation promoted by various drug-based regulations through a systems biology approach. Our model showed the phenomenon of DAPT-mediated antagonism of Enhancer of split [E(spl)] genes and enhancement of Shh target genes by a SAG agonist that were effectively demonstrated computationally and were consistent with experimental studies. However, in the case of model simulation of Wnt and EGF pathways, the model network did not supply any concurrent results with experimental data despite the fact that drugs were added at the appropriate positions. This paves insight into the potential of crosstalks between pathways considered in our study. Therefore, we manually developed a map of signaling crosstalk, which included the species connected by representatives from Notch, Shh, Wnt, and EGF pathways and highlighted the regulation of a single target gene, Hes-1, based on drug-induced simulations. These simulations provided results that matched with experimental studies. Therefore, these signaling crosstalk models complement as a tool toward the discovery of novel regulatory processes involved in neural stem cell maintenance, proliferation, and differentiation during mammalian central nervous system development. To our knowledge, this is the first report of a simple crosstalk map that highlights the differential regulation of neural stem cell differentiation and underscores the flow of positive and negative regulatory signals modulated by drugs. This model is hosted on BioModels Database and identified by: BIOMD0000000396. To cite BioModels Database, please use: BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

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Hematopoietic stem cells treated with the Notch ligand Delta 4 HSC_notch_IGR

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