Androgenic suppression of mouse hepatic FAD-containing monooxygenase activity |
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Authors: | Michelle W. Kloss Gerald M. Rosen Elmer J. Rauckman George M. Padilla |
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Affiliation: | Departments of Pharmacology, Surgery, and Physiology, Duke University Medical Center, Durhan, NC 27710, USA |
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Abstract: | Sex-related differencesin the activity of hepatic FAD-containing monooxygenase (FAD-M) were found in C3H/St mice. Adult female mice had enzyme activities nearly two-fold greater than male mice and these, differences which were absent in sexually immature mice, became apparent at the onset of puberty. The sex differences in hepatic FAD-M appeared to be mediated through the suppressive effect of testosterone; castration of male mice enhanced enzyme activity, while androgenic replacement returned activities to control levels. Testosterone's suppressive effect was found to be relatively specific for hepatic FAD-M. Treatment of castrated male mice with both the anti-androgen flutamide and testosterone returned enzyme activity to control levels, suggesting that testosterone's regulation of hepatic microsomal FAD-M is receptor-mediated. Female gonadectomy had no effect on this enzyme's activity. |
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