Stem cell aging. A mitochondrial UPR-mediated metabolic checkpoint regulates hematopoietic stem cell aging.
Science
; 347(6228): 1374-7, 2015 Mar 20.
Article
em En
| MEDLINE
| ID: mdl-25792330
ABSTRACT
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 (UPR(mt)), 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 (PFS(mt)), 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 UPR(mt)-mediated metabolic checkpoint as a reversible contributing factor for HSC aging.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Células-Tronco Hematopoéticas
/
Senescência Celular
/
Proteínas Mitocondriais
/
Sirtuínas
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Fator 1 Nuclear Respiratório
/
Resposta a Proteínas não Dobradas
/
Pontos de Checagem do Ciclo Celular
/
Mitocôndrias
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article