Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptome analysis of Stem Cells from Human Umbilical Cord Blood


ABSTRACT: Uncovering the molecular mechanism of stem cell self-renewal is critical to broaden current therapeutic applications and to understand how its de-regulation may lead to pathological conditions. In this work, we report changes in gene expression and related cell processes during conditions of high in vitro expansion of CD133+/CD34+ primitive stem cells from human umbilical cord blood (UCB). Based on DNA microarray assays, we demonstrate that primary metabolism and cell cycle genes are specifically up-regulated, as well as members of the Wnt and Notch signaling pathways. Estradiol (E2) treatment resulted in enhanced cell expansion, which was correlated with activation of MEK/ERK signaling genes and inhibition of GLI2, a member of the Hedgehog pathway. Most notably, E2-induced CD133+/CD34+ cell expansion was highly associated to regulation of genes disrupted in cancer, such as the recently described DOCK4 and SPARCL1 tumor suppressor genes. Quantitative real-time PCR analysis confirmed down-regulation of DOCK4 and SPARCL1 in E2-treated CD133+/CD34+ cells and parallel results were verified when comparing their expression in mononuclear blood cells of chronic myeloid leukemia patients and healthy individuals. The striking differential expression of cancer-associated genes found reveals potential molecular targets for oncogenic transformation of CD133+/CD34+ cells and strengthens the importance of pre-clinical studies assessing safety of stem cell expansion protocols for therapeutic application. Keywords: dose response Gene expression intensities were measured using CodeLink Human Whole Genome Bioarrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Ricardo Vêncio 

PROVIDER: E-GEOD-4609 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Common molecular pathways involved in human CD133+/CD34+ progenitor cell expansion and cancer.

Okamoto Oswaldo Keith OK   Carvalho Ana Carolina S R AC   Marti Luciana C LC   Vêncio Ricardo Z RZ   Moreira-Filho Carlos A CA  

Cancer cell international 20070608


<h4>Background</h4>Uncovering the molecular mechanism underlying expansion of hematopoietic stem and progenitor cells is critical to extend current therapeutic applications and to understand how its deregulation relates to leukemia. The characterization of genes commonly relevant to stem/progenitor cell expansion and tumor development should facilitate the identification of novel therapeutic targets in cancer.<h4>Methods</h4>CD34+/CD133+ progenitor cells were purified from human umbilical cord b  ...[more]

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