期刊
STEM CELL REPORTS
卷 3, 期 6, 页码 1085-1102出版社
CELL PRESS
DOI: 10.1016/j.stemcr.2014.10.005
关键词
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资金
- Agence Nationale de la Recherche
- Ligue Nationale contre le Cancer
- ARC
Hematopoietic stem cells (HSCs) are characterized by the capacity for self-renewal and the ability to reconstitute the entire hematopoietic compartment. Thrombopoietin maintains adult HSCs in a quiescent state through the induction of cell cycle inhibitors p57(Kip2) and p19(INK4d). Using the p19(INK4d-/-) mouse model, we investigated the role of p19(INK4d) in basal and stress-induced hematopoiesis. We demonstrate that p19(INK4d) is involved in the regulation of HSC quiescence by inhibition of the G0/G1 cell cycle transition. Under genotoxic stress conditions, the absence of p19(INK4d) in HSCs leads to accelerated cell cycle exit, accumulation of DNA double-strand breaks, and apoptosis when cells progress to the S/G2-M stages of the cell cycle. Moreover, p19(INK4d) controls the HSC microenvironment through negative regulation of megakaryopoiesis. Deletion of p19(INK4d) results in megakaryocyte hyperproliferation and increased transforming growth factor beta 1 secretion. This leads to fibrosis in the bone marrow and spleen, followed by loss of HSCs during aging.
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