Hematopoietic stem cell quiescence attenuates DNA damage response and permits DNA damage accumulation during aging.
The aging of tissue-specific stem and progenitor cells is believed to be central to the pathophysiological conditions arising in aged individuals. While the mechanisms driving stem cell aging are poorly understood, mounting evidence points to age-dependent DNA damage accrual as an important contributing factor. While it has been postulated that DNA damage may deplete stem cell numbers with age, recent studies indicate that murine hematopoietic stem cell (HSC) reserves are in fact maintained despite the accrual of genomic damage with age. Evidence suggests this to be a result of the quiescent (G0) cell cycle status of HSC, which results in an attenuation of checkpoint control and DNA damage responses for repair or apoptosis. When aged stem cells that have acquired damage are called into cycle under conditions of stress or tissue regeneration however, their functional capacity was shown to be severely impaired. These data suggest that age-dependent DNA damage accumulation may underlie the diminished capacity of aged stem cells to mediate a return to homeostasis after acute stress or injury. Moreover, the cytoprotection afforded by stem cell quiescence in stress-free, steady-state conditions suggests a mechanism through which potentially dangerous lesions can accumulate in the stem cell pool with age.
Rossi
Derrick J
DJ
Department of Pathology, Stanford Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California 94305, USA. drossi@stanford.edu
Seita
Jun
J
Czechowicz
Agnieszka
A
Bhattacharya
Deepta
D
Bryder
David
D
Weissman
Irving L
IL
D000375:Aging / Q000473:pathology*; D000818:Animals; D017209:Apoptosis; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000378:metabolism*; D016922:Cellular Senescence; D004249:DNA Damage; D004260:DNA Repair / Q000235:genetics; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL
D018797:Cell Cycle Proteins