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• W1972372484 abstract "Eukaryotic cells have evolved elaborate mechanisms to preserve the fidelity of their genomic material in the face of chronic attack by reactive byproducts of aerobic metabolism. These mechanisms include antioxidant and DNA repair enzymes. Skin fibroblasts of long-lived mammalian species are more resistant to oxidative stress than those of shorter-lived species [Kapahi, P., Boulton, M.E., Kirkwood, T.B., 1999. Positive correlation between mammalian life span and cellular resistance to stress. Free Radic. Biol. Med. 26, 495-500], and we speculated that this is due to greater antioxidant and/or DNA repair capacities in longer-lived species. We tested this hypothesis using dermal fibroblasts from mammalian species with maximum lifespans between 5 and 122 years. The fibroblasts were cultured at either 18 or 3% O(2). Of the antioxidant enzymes only manganese superoxide dismutase was found to positively correlate with maximum lifespan (p<0.01). Oxidative damage to DNA is primary repaired by the base excision repair (BER) pathway. BER enzyme activities showed either no correlation (apurinic/apyrimidinic endonuclease), or correlated negatively (p<0.01) with donor species MLS (polymerase beta). Standard culture conditions (18% O(2)) induced both antioxidant and BER enzymes activities, suggesting that the 'normal' cell culture conditions widely employed are inappropriately hyperoxic, which likely confounds the interpretation of studies of cellular oxidative stress responses in culture." @default.
• W1972372484 created "2016-06-24" @default.
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• W1972372484 date "2007-11-01" @default.
• W1972372484 modified "2023-09-25" @default.
• W1972372484 title "Correlation of mitochondrial superoxide dismutase and DNA polymerase β in mammalian dermal fibroblasts with species maximal lifespan" @default.
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• W1972372484 doi "https://doi.org/10.1016/j.mad.2007.10.004" @default.
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