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Abstract
3β-hydroxysteroid dehydrogenase activity has been located in the interstitial cells of the goldfish testis. This activity falls rapidly after hypophysectomy reaching a very low or undetectable level within 25 postoperative days. Replacement therapy using salmon gonadotropin showed that this enzymic activity and spermiation are dependent on pituitary gonadotropin. However, the enzymic activity did not increase significantly at spermiation and spermiation could be induced even when there is a very low or undetectable level of 3 β-ol dehydrogenase. A single injection of salmon gonadotropin induces spermiation and hypertrophy of the interstitial cells. Androgen was also found to be effective for the induction of spermiation. These facts suggest that despite the lack of a direct correlation between 3 β-ol dehydrogenase and spermiation, the pituitary gonadotropin may act on the interstitial cells and induce the secretion of androgens which in turn bring about spermiation.
Published Version
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