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The Gene Encoding the Hematopoietic Stem Cell Regulator CCN3/NOV is Under Direct Cytokine Control Through the Transcription Factors STAT5A/B

Overview
Journal J Biol Chem
Specialty Biochemistry
Date 2010 Aug 20
PMID 20720003
Citations 9
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Abstract

Cytokines control the biology of hematopoietic stem cells (HSCs) and progenitor cells in part through the transcription factors STAT5A/B. To investigate the target genes of STAT5A/B activated by cytokines in HSCs and progenitors, we performed microarray analyses using Lineage(-) Sca-1(+) c-Kit(+) (KSL) cells in the presence and absence of STAT5A/B. Stimulation with a mixture containing IL-3, IL-6, stem cell factor, thrombopoietin, and Flt3 ligand induced Ccn3/Nov mRNA over 100-fold in WT (control) but not Stat5a/b-null KSL cells. CCN3/NOV is a positive regulator of human HSC self-renewal and development of committed blood cells. Without stimulation, the Ccn3/Nov signal level was low in control KSL cells similar to Stat5a/b-null KSL cells. To determine which cytokine activates the Ccn3/Nov gene, we analyzed Lineage(-) c-Kit(+) (KL) and 32D cells using quantitative PCR and ChIP assays. Although stimulation with a mixture lacking IL-3 prevented the induction of Ccn3/Nov in control KL cells, IL-3 alone could induce Ccn3/Nov mRNA in control KL and 32D cells. ChIP assays using 32D cells revealed IL-3-induced binding of STAT5A/B to a γ-interferon-activated sequences site in the Ccn3/Nov gene promoter. This is the first report that Ccn3/Nov is directly induced by cytokines through STAT5A/B.

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