Journal
SCIENCE
Volume 347, Issue 6228, Pages 1374-1377Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa2361
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Funding
- NIH [R01 AG040990, R01AG040061, T32 AG000266]
- Ellison Medical Foundation
- Glenn Foundation
- NSF Graduate Research Fellowship Program
- Siebel Stem Cell Institute
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Deterioration of adult stem cells accounts for much of aging-associated compromised tissue maintenance. How stem cells maintain metabolic homeostasis remains elusive. Here, we identified a regulatory branch of the mitochondrial unfolded protein response (UPRmt), which is mediated by the interplay of SIRT7 and NRF1 and is coupled to cellular energy metabolism and proliferation. SIRT7 inactivation caused reduced quiescence, increased mitochondrial protein folding stress (PFSmt), and compromised regenerative capacity of hematopoietic stem cells (HSCs). SIRT7 expression was reduced in aged HSCs, and SIRT7 up-regulation improved the regenerative capacity of aged HSCs. These findings define the deregulation of a UPRmt-mediated metabolic checkpoint as a reversible contributing factor for HSC aging.
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