期刊
STEM CELLS
卷 38, 期 6, 页码 756-768出版社
WILEY
DOI: 10.1002/stem.3169
关键词
fatty acid metabolism; hairy enhancer of Split 1; hematopoietic reconstitution capacity; hematopoietic stem progenitor cells; PPAR gamma signaling pathway; replicative stress
资金
- NIGMS NIH HHS [U54 GM104942, P20 GM121322] Funding Source: Medline
The transcriptional repressor Hairy Enhancer of Split 1 (HES1) plays an essential role in the development of many organs by promoting the maintenance of stem/progenitor cells, controlling the reversibility of cellular quiescence, and regulating both cell fate decisions. Deletion of Hes1 in mice results in severe defects in multiple organs and is lethal in late embryogenesis. Here we have investigated the role of HES1 in hematopoiesis using a hematopoietic lineage-specific Hes1 knockout mouse model. We found that while Hes1 is dispensable for steady-state hematopoiesis, Hes1-deficient hematopoietic stem cells (HSCs) undergo exhaustion under replicative stress. Loss of Hes1 upregulates the expression of genes involved in PPAR gamma signaling and fatty acid metabolism pathways, and augments fatty acid oxidation (FAO) in Hes1( f/f)Vav1Cre HSCs and progenitors. Functionally, PPAR gamma targeting or FAO inhibition ameliorates the repopulating defects of Hes1( f/f)Vav1Cre HSCs through improving quiescence in HSCs. Lastly, transcriptome analysis reveals that disruption of Hes1 in hematopoietic lineage alters expression of genes critical to HSC function, PPAR gamma signaling, and fatty acid metabolism. Together, our findings identify a novel role of HES1 in regulating stress hematopoiesis and provide mechanistic insight into the function of HES1 in HSC maintenance.
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