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Reduction of androstenedione by skin in vitro and serum levels of gonadotrophins and androgens in men with hypospadias.

The reduction of 4-[1,2-3H]androstene-3,17-dione (androstenedione) in vitro by scrotal skin was measured in samples from nine men (16--34 years old) with hypospadias and from ten male control subjects. The reduction of androstenedione was also studied in axillary and upper arm skin of seven control subjects. Androstenedione was reduced to material with chromatographic characteristics of 5 alpha-androstane-3,17-dione and to 3 alpha- and 3 beta-hydroxy-5 alpha-androstan-17-one. No difference in 5 alpha-reductase activity (defined as the sum of these three metabolites formed) was found in scrotal skin from hypospadic and control men. The mean concentration of 5 alpha-dihydrotestosterone in serum from men with hypospadias was lower than that in serum from control subjects (P less than 0.01). The mean ratio of the serum concentrations of testosterone and 5 alpha-dihydrotestosterone was higher in hypospadic men than in control subjects (P less than 0.05). No differences between the two groups were found in the mean serum concentrations of LH, FSH, prolactin, dehydroepiandrosterone, androstenedione, testosterone or testosterone-binding globulin.