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In vitro Metabolism of (3H)-Androstenedione in the Rat Epididymis and Vas Deferens
Authors:BS SETTY  JTS LEASK  and GMH WAITES
Institution:Department of Physiology and Biochemistry The University, Whiteknights Reading RG6 2AJ, Berkshire, England;Division of Endocrinology Central Drug Research Institute Lucknow/India
Abstract:The in vitro metabolism of (3H)-androstenedione in the epididymis and vas deferens of intact and castrated rats was investigated and the metabolites formed were identified by radio gas chromatography. Incubation of slices of caput epididymidis for 2 hr at 34 degrees C metabolised 90% androstenedione. Similar incubations of tissue samples from cauda epididymidis and vas deferens metabolized 60 and 25% of androstenedione respectively. The major metabolites formed in the epididymis were androstanedione (caput: 48%; cauda: 33%) and androsterone (caput: 35%; cauda: 13%). These metabolites appeared in much less concentration in the incubations with vas deferens (about 8% each). In general, conversion to testosterone and dihydrotesterone was low in all the three organs examined. Castration did not significantly alter the metabolic pattern in the caput epididymidis and vas deferens but promoted the formation of androsterone (38%) in the cauda epididymidis. The conversion of androstenedione, a weak androgen to testosterone, dihydrotestosterone and 3 alpha/3 beta-diols in the epididymidis and vas deferens of castrated rats may be of physiological significance. In addition, androsterone appears to be an important androgenic metabolite in the epididymis.
Keywords:Epididymis  androstenedione  vas deferens  androstenedione  epididymis  androgen  vas deferens  androgen  rat  androgen metabolism
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