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The maintenance of the resident adult neural stem/progenitor cell (NSPC) pool depends on the precise balance of proliferation, differentiation, and maintenance of the undifferentiated state. Identifying the mechanisms that regulate this balance in adult hippocampal NSPCs can provide insight into basic stem cell self-renewal principles important for tissue homeostasis and preventing tumor formation. Pharmacological inhibition of histone deacetylases (HDACs), a class of histone-modifying enzymes, have promising effects in cancer cells, yet the specific roles of individual HDACs in stem cell proliferation is unclear. Here using conditional KO (cKO) mice and in vitro cell culture, we show that histone deacetylase 3 (HDAC3) is required for the proliferation of adult NSPCs. Detailed cell cycle analysis of NSPCs from Hdac3 cKO mice reveals a defect in cell cycle progression through the gap 2/mitosis (G2/M) but not the S phase. Moreover, HDAC3 controls G2/M phase progression mainly through posttranslational stabilization of the G2/M cyclin-dependent kinase 1 (CDK1). These results demonstrate that HDAC3 plays a critical role in NSPC proliferation and suggest that strategies aimed at pharmacological modulation of HDAC3 may be beneficial for tissue regeneration and controlling tumor cell growth.

HDAC3 controls gap 2/mitosis progression in adult neural stem/progenitor cells by regulating CDK1 levels