title: The effect of a 5 alpha-reductase inhibitor on androgen-mediated growth of the dog prostate.
abstract: The administration of testosterone cypionate (0.4 mg/kg BW . day) to castrated male dogs caused a doubling of prostate weight within 4 weeks and an increase in the content of testosterone and dihydrotestosterone in the prostate. When the 5 alpha-reductase inhibitor 17-N,N-diethylcarbamoyl-4-methyl-4-aza-5 alpha-androstan-3-one (3 mg/kg BW . day) was administered simultaneously with testosterone cypionate, prostatic testosterone content increased from 0.5 +/- 0.2 to 4.1 +/- 1.3 ng/mg DNA, the increase in prostatic dihydrotestosterone content was prevented, and prostatic size decreased to half the starting weight. These results suggest that dihydrotestosterone formation plays a role in prostatic growth.
mesh_terms: D058891:5-alpha Reductase Inhibitors; D000375:Aging; D000818:Animals; D001378:Azasteroids / Q000494:pharmacology*; D002369:Castration; D013196:Dihydrotestosterone / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D004285:Dogs; D008297:Male; D009929:Organ Size / Q000187:drug effects; D011467:Prostate / Q000187:drug effects / Q000254:growth & development*; D013260:Steroids, Heterocyclic / Q000494:pharmacology*; D013739:Testosterone / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology
chemical_list: D058891:5-alpha Reductase Inhibitors; D001378:Azasteroids; D013260:Steroids, Heterocyclic; D013196:Dihydrotestosterone; D013739:Testosterone; C031563:17-N,N-diethylcarbamoyl-4-methyl-4-azaandrostane-3-one; C016131:testosterone 17 beta-cypionate