Small doses of 5α-dihydrotestosterone mimic the effects of 5α-androstane-3β,17β-diol on acid phosphatase activity in the adult rat prostate gland

These studies were designed to further investigate whether 5α-androstane-3β,17β-diol was exerting unique effects on rat prostate acid phosphatase activity or could possibly be exerting its actions by a small peripheral conversion to 5α-dihydrotestosterone. Intraperitoneal administration of 5α-dihydrotestosterone in doses of 1 mg, 100 μg or 50 μg per day starting 7 days after castration led to the restoration of normal characteristics of acid phosphatase activity. However, when 5α-dihydrotestosterone was given in a dose of only 25 μg per day starting 7 days after castration, the changes in acid phosphatase activity were indistinguishable from those found when 5α-androstane-3β,17β-diol was administered in a dose of 2 mg per day. This suggests that the effects of 5α-androstane-3β,17β-diol can be explained by its conversion to small amounts of 5α-dihydrotestosterone.