DNA repair synthesis has been compared in primary hepatocyte cultures obtained from 3-month-old and 16-20-month-old rats. Several morphological and metabolic characteristics were determined to assure cultures of comparable quality. DNA damage was induced by the addition of bleomycin or the exposure of the culture to UV irradiation. DNA repair (unscheduled DNA synthesis) was determined by measuring [3H]thymidine incorporation. After UV irradiation, there was almost twice as much [3H]thymidine incorporation in cells obtained from young rats as in those obtained from old rats. Equal amounts of bleomycin resulted in substantially greater damage to DNA in cells from old rats than from young rats. For equal amounts of DNA damage there was again diminished [3H]thymidine incorporation in cells obtained from old rats. Finally equal amounts of bleomycin resulted in equal damage to DNA when the bleomycin was added to isolated rat liver nuclei from young or old rats. Bleomycin treated nuclei from young rats incorporated substantially more [3H]thymidine triphosphate (TTP) than bleomycin treated nuclei from old rats. The results indicate that hepatocytes from old rats are much more susceptible to bleomycin than hepatocytes from young rats and that the capacity for DNA repair synthesis is impaired in hepatocytes from old rats.
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