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The Paf oncogene is essential for hematopoietic stem cell function and development.

J Exp Med. 2011 Aug 29;208(9):1757-65. Epub 2011 Aug 15
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摘要


Hematopoietic stem cells (HSCs) self-renew to maintain the lifelong production of all blood populations. Here, we show that the proliferating cell nuclear antigen-associated factor (Paf) is highly expressed in cycling bone marrow HSCs and plays a critical role in hematopoiesis. Mice lacking Paf exhibited reduced bone marrow cellularity; reduced numbers of HSCs and committed progenitors; and leukopenia. These phenotypes are caused by a cell-intrinsic blockage in the development of long-term (LT)-HSCs into multipotent progenitors and preferential loss of lymphoid progenitors caused by markedly increased p53-mediated apoptosis. In addition, LT-HSCs from Paf(-/-) mice had increased levels of reactive oxygen species failed to maintain quiescence, and were unable to support LT hematopoiesis. The loss of lymphoid progenitors was likely due the increased levels of in LT-HSCs caused by treatment of Paf(-/-) mice with the anti-oxidant N-acetylcysteine restored lymphoid progenitor numbers to that of Paf(+/+) mice. Collectively, our studies identify Paf as a novel and essential regulator of early hematopoiesis.

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