Elevated Hedgehog activity contributes to attenuated DNA damage responses in aged hematopoietic cells.
Leukemia
; 34(4): 1125-1134, 2020 04.
Article
em En
| MEDLINE
| ID: mdl-31728056
ABSTRACT
Accumulation of DNA damage and myeloid-skewed differentiation characterize aging of the hematopoietic system, yet underlying mechanisms remain incompletely understood. Here, we show that aging hematopoietic progenitor cells particularly of the myeloid branch exhibit enhanced resistance to bulky DNA lesions-a relevant type of DNA damage induced by toxins such as cancer drugs or endogenous aldehydes. We identified aging-associated activation of the Hedgehog (Hh) pathway to be connected to this phenotype. Inhibition of Hh signaling reverts DNA damage tolerance and DNA damage-resistant proliferation in aged hematopoietic progenitors. Vice versa, elevating Hh activity in young hematopoietic progenitors is sufficient to impair DNA damage responses. Altogether, these findings provide experimental evidence for aging-associated increases in Hh activity driving DNA damage tolerance in myeloid progenitors and myeloid-skewed differentiation. Modulation of Hh activity could thus be explored as a therapeutic strategy to prevent DNA damage tolerance, myeloid skewing, and disease development in the aging hematopoietic system.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Dano ao DNA
/
Envelhecimento
/
Células-Tronco Hematopoéticas
/
Diferenciação Celular
/
Proteínas Hedgehog
/
Hematopoese
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Female
/
Humans
Idioma:
En
Revista:
Leukemia
Assunto da revista:
HEMATOLOGIA
/
NEOPLASIAS
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Alemanha