Abstract
Male Fischer 344 rats classified as young (2–4 months), middle age (12–15 months) and aged (22–25 months) were examined for changes in renal metabolism of acetaminophen. Renal microsomal cytochrome P-450 levels were 30% and 48% lower in middle age and aged animals, respectively, compared to young; however, no age-related changes were observed in NADPH-cytochrome c reductase activity. Renal mixed-function oxidase production of the reactive intermediate of acetaminophen was reduced 50% in aged rats. The deacetylation of acetaminophen to the nephrotoxic metabolite p-aminophenol by the renal 10,000 × g supernatant fraction was not changed by age. Thus, p-aminophenol becomes the proportionately greater nephrotoxic metabolite of acetaminophen produced by the aged rat kidney. Whole kidney reduced and oxidized glutathione content tended to be higher in aged rats, while glutathione S-transferase activity was 46% lower in aged animals. These results demonstrate that age alters several indices of renal metabolism of acetaminophen in male Fischer 344 rats.
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Beierschmitt, W.P., Weiner, M. Age-related changes in renal metabolism of acetaminophen in male Fischer 344 rats. AGE 9, 7–13 (1986). https://doi.org/10.1007/BF02431894
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DOI: https://doi.org/10.1007/BF02431894