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- W2072644588 abstract "Studies were carried out to investigate the mechanism(s) responsible for the changes in adrenal microsomal mixed function oxidase activity which occur with aging (30-200 days) in guinea pigs. With aging, the rate os metabolism of xenobiotics [ethylmorphine and benzo(a)pyrene] by adrenal microsomes increased 3- to 5-fold. Steroid 17 alpha- and 21-hydroxylations, when expressed per mg protein, were similar in immature (30 days old) and mature (200 days old) animals. Adrenal microsomal NADPH- and NADH-cytochrome c reductase activities and cytochrome b5 concentrations increased wih aging, but cytochrome P-450 concentrations were not significantly different in young and old guinea pigs. Maximal type I difference spectra produced by steroids were the same in adrenal microsomes from 30- and 200-day-old guinea pigs, but the ethylmorphine-induced spectrum was far greater in the older animals. Progesterone enhanced NADPH-cytochrome P-450 reductase activity to about the same extent in adrenal microsomes from 30- and 200-day-old guinea pigs. Ethylmorphine had no effect on the rate of reduction of cytochrome P-450 in adrenals from young animals but produced a 4-fold increase in activity in adrenals from older animals. The results demonstrate selective changes in adrenal xenobiotic metabolism with aging and suggest that changes in the composition and/or reactivity of adrenal cytochromes P-450 are responsible for the effects of aging." @default.
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- W2072644588 date "1980-11-01" @default.
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- W2072644588 title "Changes in Adrenal Microsomal Cytochrome(s) P-450 with Aging in the Guinea Pig*" @default.
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- W2072644588 doi "https://doi.org/10.1210/endo-107-5-1359" @default.
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