3α-, 3β-, 11β-, 16β-, 17β- and 20β-hydroxysteroid dehydrogenases have been localized histochemically in the Leydig cells of prepubertal and adult human testes; 3α-, 16β- and 17β-hydroxysteroid dehydrogenases were present in the seminiferous tubules also. A similar pattern was found in cryptorchid testes. In addition 3β-sulphoxy steroids, including DHA sulphate, gave a good colour reaction in human Leydig cells. Testes from oestrogen-treated subjects had no histochemically demonstrable hydroxysteroid dehydrogenases and this applied also to infarcted testes. Testes from a case of Klinefelter's syndrome were found to lack 17β- and 20β-hydroxysteroid dehydrogenases in the Leydig cells. The biochemical significance of these results is discussed.
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