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Genes Dev. 2008 Apr 15;22(8):992-7. doi: 10.1101/gad.1651408.

The E3 ubiquitin ligase c-Cbl restricts development and functions of hematopoietic stem cells.

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  • 1Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.

Erratum in

  • Genes Dev. 2009 Sep 1;23(17):2116.

Abstract

Hematopoietic stem cells (HSCs) are multipotent progenitors that give rise to all types of blood cells. In the present study, we document that HSC development and functions are negatively regulated by the E3 ubiquitin ligase c-Cbl (casitas B-cell lymphoma). HSCs of c-Cbl(-/-) mice exhibit augmented pool size, hyperproliferation, greater competence, and enhanced long-term repopulating capacity. Our mechanistic studies identified that c-Cbl(-/-) HSCs are hyperresponsive to thrombopoietin (TPO) and display elevated levels of STAT5 phosphorylation, thus leading to increased c-Myc expression. In essence, our data unequivocally identify c-Cbl as a novel negative regulator of developmental and functional properties of HSCs.

PMID:
18413713
[PubMed - indexed for MEDLINE]
PMCID:
PMC2335331
Free PMC Article
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