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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of CD34+CD38- vs CD34+CD38+ fractions of human umbilical cord blood and comparison of slow-dividing fraction vs the fast dividing fraction of CD34+/CD38- population

ABSTRACT: Comparison of the CD34+CD38- versus CD34+CD38+ fractions of human umbilical cord blood and comparison of the slow-dividing fraction versus the fast dividing fraction of the CD34+/CD38- population.

ORGANISM(S): Homo sapiens

SUBMITTER: Wolfgang Wagner

PROVIDER: E-EMBL-1 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Retroviral integration sites correlate with expressed genes in hematopoietic stem cells.

Wagner Wolfgang W Laufs Stephanie S Blake Jonathon J Schwager Christian C Wu Xiaolin X Zeller Jens W JW Ho Anthony D AD Fruehauf Stefan S

Stem cells (Dayton, Ohio) 20050901 8

In this study, we analyzed whether retroviral integration sites in repopulating hematopoietic cells correlate with genes expressed in fractions enriched in hematopoietic stem cells (HSCs). We have previously described microarray studies of two populations enriched in HSCs: CD34+/CD38- and the slow dividing fraction of CD34+/CD38- cells (SDF). Furthermore, we demonstrated that oncoretroviral integrations in severe combined immunodeficient repopulating cells are preferentially located near the tra ...[more]

PMID: 16140869

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Transcription profiling of human gene expression profiles of CD34+/CD38- cells vs AFT024

Project description:It is widely accepted that hematopoietic progenitor cells (HPC) are tightly associated with discrete niches within the bone marrow. This molecular environment supports and regulates their self renewal and differentiation. AFT024 is a cell line derived from murine fetal liver that has been demonstrated to maintain human hematopoietic progenitors in an undifferentiated state in vitro. While various functional and genomic studies of this and other stromal layers have already been reported, the influence of the cellular microenvironment on the gene expression of HPC has not yet been systematically analyzed.<br> <br> The CD34+/CD38- fraction of human umbilical cord blood was parted and either cultivated on AFT024 [kindly provided by I. Lemischka] or without stromal feeder layer for 16h, 20h, 48h or 72h. Both fractions were then harvested and separated by vigorous pipetting and FACS sorted again to separate the HPC from AFT024. Global gene expression profiles were determined using a novel Human Genome cDNA Microarray of over 51,145 ESTs of the UnigenSet-RZPD3. In analogy, we have compared the gene expression profiles of CD34+/CD38- cells versus AFT024 to exclude that differential gene expression resulted from contaminating feeder layer cells.

2005-06-13 | E-EMBL-3 | biostudies-arrayexpress

Transcription profiling of adherent and non-adherent human hematopoietic progenitor cells

Project description:Comparison of gene expression of the adherent and non-adherent fraction of hematopoietic progenitor cells.

2007-03-13 | E-MEXP-586 | biostudies-arrayexpress

PRC2 inhibition counteracts the culture-associated loss of engraftment potential of human cord blood-derived hematopoietic stem and progenitor cells

Project description:Cord blood hematopoietic stem cells (CB-HSCs) are an outstanding source for transplantation approaches. However, the amount of cells per donor is limited and culture expansion of CB-HSCs is accompanied by a loss of engraftment potential. In order to analyze the molecular mechanisms leading to this impaired potential we profiled global and local epigenotypes during the expansion of human CB hematopoietic stem and progenitor cells (HPSCs). Human CB-derived CD34+ cells were cultured in serum-free medium together with SCF, TPO, FGF, with or without Igfbp2 and Angptl5 (STF/STFIA cocktails). As compared to the STF cocktail, the STFIA cocktail maintains in vivo repopulation capacity of cultured CD34+ cells. Upon expansion, CD34+ cells genome-wide remodel their epigenotype and depending on the cytokine cocktail, cells show different H3K4me3 and H3K27me3 levels. Expanding cells without Igfbp2 and Angptl5 leads to higher global H3K27me3 levels. ChIPseq analyses reveal a cytokine cocktail-dependent redistribution of H3K27me3 profiles. Inhibition of the PRC2 component EZH2 counteracts the culture-associated loss of NOD scid gamma (NSG) engraftment potential. Collectively, our data reveal chromatin dynamics that underlie the culture-associated loss of engraftment potential. We identify PRC2 component EZH2 as being involved in the loss of engraftment potential during the in vitro expansion of HPSCs. 6 samples were hybridized GeneChip Human Gene 1.0 ST Arrays (Affymetrix)

2015-08-07 | E-GEOD-58461 | biostudies-arrayexpress

Gene expression in human myeloid cells

Project description:Human myelopoiesis is an exciting biological model for cellular differentiation since it represents a plastic process where pluripotent stem cells gradually limit their differentiation potential, generating different precursor cells which finally evolve into distinct terminally differentiated cells. This study aimed at investigating the genomic expression during myeloid differentiation through a computational approach that integrates gene expression profiles with functional information and genome organization. The genomic distribution of myelopoiesis genes was investigated integrating transcriptional and functional characteristics of genes. The analysis of genomic expression during human myelopoiesis using an integrative computational approach allowed discovering important relationships between genomic position, biological function and expression patterns and highlighting chromatin domains, including genes with coordinated expression and lineage-specific functions. Keywords: cell differentiation Gene expression data from 20 experiments for 8 different cell types of the human myelopoietic lineage were used to generate an integrated myelopoiesis dataset.

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Expression data from human hematopoietic stem and progenitor compartments from patients with acute myeloid leukemia with monosomy 7 and healthy controls

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Transcription profiling of human umbilical cord blood and adult bone marrow CD34+CD33-CD38-Rho(lo)c-kit+ cells to identify candidate regulators of HSC self-renewal versus differentiation fate decisions

Project description:The global gene expression profiles of human umbilical cord blood and adult bone marrow CD34+CD33-CD38-Rho(lo)c-kit+ cells, enriched for hematopoietic stem/progenitor cells (HSC) with CD34+CD33-CD38-Rho(hi) cells, enriched in committed hematopoietic progenitor cells (HPC), were compared to identify candidate regulators of HSC self-renewal versus differentiation fate decisions.

2007-10-30 | E-GEOD-2666 | biostudies-arrayexpress

Gene expression profiles of AML derived stem cells: similarity to hematopoietic stem cells

Project description:Tumors contain a fraction of cancer stem cells that maintain the propagation of the disease. The CD34‏CD38_ cells, isolated from acute myeloid leukemia (AML), were shown to be enriched leukemic stem cells (LSC). We isolated the CD34‏CD38_ cell fraction from AML and compared their gene expression profiles to the CD34‏CD38‏ cell fraction, using microarrays. We found 409 genes that were at least twofold over- or underexpressed between the two cell populations. These include underexpression of DNA repair, signal transduction and cell cycle genes, consistent with the relative quiescence of stem cells, and chromosomal aberrations and mutations of leukemic cells. Comparison of the LSC expression data to that of normal hematopoietic stem cells (HSC) revealed that 34% of the modulated genes are shared by both LSC and HSC, supporting the suggestion that the LSC originated within the HSC progenitors. We focused on the Notch pathway since Jagged-2, a Notch ligand was found to be overexpressed in the LSC samples. We show that DAPT, an inhibitor of gamma-secretase, a protease that is involved in Jagged and Notch signaling, inhibits LSC growth in colony formation assays. Identification of additional genes that regulate LSC self-renewal may provide new targets for therapy. Microarrays were used to compare the gene expression patterns between AML CD34+CD38- cells and AML CD34+CD38+

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