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• W2082116042 startingPage "171" @default.
• W2082116042 abstract "It has been reported that the replicative lifespan of human fibroblasts can be substantially extended by supplementing the growth medium with hydrocortisone or increased levels of serum proteins. These observations have been made only on cell populations transferred many times at high cell density, and cumulative population doublings have been recorded, rather than a more direct measure of cell division potential. We have measured the replicative potential of human fibroblasts cultured so as to avoid conditions of high cell density, medium depletion, and departure from exponential growth. Two fetal lung and two newborn foreskin fibroblast strains were serially passaged in the presence or absence of hydrocortisone (HC), epidermal growth factor (EGF), and fibroblast growth factor (FGF) until they senesced. At each passage cells were plated at densities sufficiently low that colony-forming efficiency could be calculated. We determined cumulative population doublings and also estimated the number of cell generations attained under each condition. FGF caused small but possibly significant changes, while HC and EGF failed to substantially alter replicative lifespan. The reported effect of HC on the doubling potential of fetal lung fibroblasts is therefore not an inevitable action of this hormone on the senescence mechanism, but may instead depend for its apparent activity on the passage regimen used. The fibroblast's insensitivity to EGF as a modulator of replicative potential, as compared with the keratinocyte, whose lifespan can be tripled by EGF, implies that the mechanisms limiting the replicative potential of these two cell types are not identical." @default.
• W2082116042 created "2016-06-24" @default.
• W2082116042 creator A5046836059 @default.
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• W2082116042 date "1981-10-01" @default.
• W2082116042 modified "2023-09-27" @default.
• W2082116042 title "Failure of hydrocortisone or growth factors to influence the senescence of fibroblasts in a new culture system for assessing replicative lifespan" @default.
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• W2082116042 doi "https://doi.org/10.1002/jcp.1041090119" @default.
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