Significant correlation of species longevity with DNA double strand break recognition but not with telomere length.
The identification of the cellular mechanisms responsible for the wide differences in species lifespan remains one of the major unsolved problems of the biology of aging. We measured the capacity of nuclear protein to recognize DNA double strand breaks (DSBs) and telomere length of skin fibroblasts derived from mammalian species that exhibit wide differences in longevity. Our results indicate DNA DSB recognition increases exponentially with longevity. Further, an analysis of the level of Ku80 protein in human, cow, and mouse suggests that Ku levels vary dramatically between species and these levels are strongly correlated with longevity. In contrast mean telomere length appears to decrease with increasing longevity of the species, although not significantly. These findings suggest that an enhanced ability to bind to DNA ends may be important for longevity. A number of possible roles for increased levels of Ku and DNA-PKcs are discussed.
Lorenzini
Antonello
A
Drexel University College of Medicine, Department of Pathology Control, Philadelphia, PA 19102, United States.
Johnson
F Brad
FB
Oliver
Anthony
A
Tresini
Maria
M
Smith
Jasmine S
JS
Hdeib
Mona
M
Sell
Christian
C
Cristofalo
Vincent J
VJ
Stamato
Thomas D
TD
D000328:Adult; D000375:Aging / Q000502:physiology*; D000818:Animals; D016466:CHO Cells; D002415:Cats; D002417:Cattle; D002685:Chiroptera; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000378:metabolism; D004249:DNA Damage / Q000502:physiology*; D004285:Dogs; D004622:Embryo, Mammalian; D005347:Fibroblasts / Q000648:ultrastructure; D006071:Gorilla gorilla; D006367:HeLa Cells; D006736:Horses; D006801:Humans; D008136:Longevity / Q000502:physiology*; D008168:Lung; D008253:Macaca mulatta; D008297:Male; D051379:Mice; D009687:Nuclear Proteins / Q000378:metabolism; D011817:Rabbits; D012867:Skin / Q000648:ultrastructure; D013045:Species Specificity; D016615:Telomere / Q000648:ultrastructure*
D009687:Nuclear Proteins; D004247:DNA