トノサマガエルの性成熟過程における精巣組織の変化
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概要
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Using second-year male frogs of Rana nigromaculata, changes in testicular structure in the process of sexual maturation were examined using light- and electron-microscopy. Histochemical detection of 3β-hydroxysteroid dehydrogenase (3β-HSD) in the testicular tissues and radiommunoassay for the determination of androgen in the serum were also performed. In early May, most reproductive cells in the seminiferous tubules were at the primary spermatogonial stage, and spermatogenesis began in the middle of May. By the beginning of October, the spermatozoa comprised over 60% of all the reproductive cells seen within the seminiferous tubules. In the interstitial cells, ultrastructure characteristics of the steroid-producing cells were hardly observed in May, June, and July, but were clearly seen at the beginning of October. Androgen levels in the serum were low from the middle of June to the end of August, but increased clearly in September, and were considerably higher at the beginning of October. The change in androgen levels mentioned above was parallel with ultrastructure and 3β-HSD activity in the interstitial cells. In connection with the above-mentioned results, the developmental mode of the thumb pad became reasonably understood. That is, the thumb pad was not observed at all until July, recognized histologically in August, and remarkably developed at the beginning of October. Androgen levels in immature frogs collected in the middle of May were about twelvefold higher than those in mature frogs collected at the beginning of October. It seems, however, that the "androgen" detected in the serum of spring immature frogs is not active in inducing the development of male sexual characters and is produced by organs other than the testis.
- 1981-03-25
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関連論文
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