Induction of Spermatogenesis in Male Japanese Eel, Anguilla japonica, by a Single Injection of Human Chorionic Gonadotropin(Endocrinology)

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Cultivated males of the Japanese eel (Anguilla japonica) were given a single injection of human chorionic gonadotropin (HCG; 5 IU/g BW), and histological changes in the testis were observed. Profiles of serum androgens (11-ketotestosterone and testosterone) and production of androgens by the testis in vitro were also measured. 1) Histology of the testis: Prior to HCG treatment, germ cells of male Japanese eel were all spermatogonia, and the morphology of Sertoli cells and Leydig cells indicated little activity. One day after injection, the first effect of HCG treatment was observed, consisting of the activation of Leydig and Sertoli cells. This was followed by proliferation of spermatogonia, which began after three days. After twelve days, some germ cells had begun meiosis. Spermatozoa were first observed after eighteen days. 2) Serum androgen profiles: Serum androgen levels were relatively low before HCG treatment, but had increased dramatically by one day after the treatment, and thereafter high levels were maintained throughout Spermatogenesis. 3) In vitro production of androgens by the testis: The testis of uninjected eels produced androgens, principally 11-ketotestosterone, when cultured in vitro with HCG. Production was proportional to the concentration of HCG. These results indicate that a single injection of HCG can induce the proliferation of spermatogonia, the initiation of meiosis, and the induction of Spermatogenesis. The phenomenon in the eel is associated with remarkable endocrinological changes, including the development of Leydig and Sertoli cells, and an increase in androgen production.
社団法人日本動物学会の論文
1991-02-15

Induction of Spermatogenesis in Male Japanese Eel, Anguilla japonica, by a Single Injection of Human Chorionic Gonadotropin(Endocrinology)

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