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SHP-1 Regulates Hematopoietic Stem Cell Quiescence by Coordinating TGF-β Signaling

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Journal J Exp Med
Date 2018 Apr 20
PMID 29669741
Citations 30
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Abstract

Cell cycle quiescence is critical for hematopoietic stem cell (HSC) maintenance. TGF-β signaling in bone marrow niche has been identified in regulating HSC quiescence; however, the intrinsic regulatory mechanisms remain unclear. This study reports that knockout HSCs have attenuated quiescence and impaired long-term self-renewal. SHP-1-activated HSCs are surrounded by megakaryocytes, which regulate HSC quiescence by producing TGF-β1. Mechanistically, SHP-1 interacts with the immunoreceptor tyrosine-based inhibition motif on TGF-β receptor 1 and is critical for TGF-β signaling activation in HSCs. Functionally, knockout HSCs do not respond to TGF-β-enforced HSC quiescence regulation, both in vitro and in vivo. Therefore, we identify TGF-β-SHP-1 as a novel intrinsic regulatory mechanism for HSC quiescence maintenance.

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