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- W2076536306 abstract "The roles of type I binding and NADPH-cytochrome P-450 reductase in ethylmorphine demethylation were investigated in two strains of mice, using sex differences in these activities as a tool. In the CPB-SE strain, females metabolize ethylmorphine faster than males. Sex differences in cytochrome P-450 content and endogenous NADPH-cytochrome P-450 reductase activity were too small to account for this. On the other hand, the differences in the magnitudes of type I spectra and ethylmorphine-induced enhancement of cytochrome P-450 reduction were considerable larger than those in the rates of demethylation. All parameters, except endogenous cytochrome P-450 reduction, were modified in a similar way by testosterone pretreatment: in females they were depressed to the male level, whereas in males they remained unchanged. Castration had no effect in females and enhanced the activities in males. The CPB-V strain exhibited little or no sex differences in ethylmorphine demethylation, cytochrome P-450 content and endogenous cytochrome P-450 reduction. Testosterone pretreatment had little or no influence on these activities. Type I binding and reductase stimulation, however, showed sex differences, comparable to those observed in the CPB-SE strain, which were also abolished by testosterone. A relationship between reductase stimulation and type I binding was observed, which was, apparently, independent of sex or strain. It is concluded that androgen primarily influences the amount of cytochrome P-450-substrate complex formed, but that the reduction of this complex is not rate-limiting in the demethylation of ethylmorphine." @default.
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- W2076536306 date "1977-11-01" @default.
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- W2076536306 title "Sex- and strain-dependent hepatic microsomal ethylmorphine N-demethylation in mice: The roles of type I binding and NADPH-cytochrome P-450 reductase" @default.
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- W2076536306 doi "https://doi.org/10.1016/0009-2797(77)90030-8" @default.
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