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Ultrastructural changes of testicular interstitial cells of silver japanese eels anguilla japonica treated with human chorionic gonadotropin



Ultrastructural changes of testicular interstitial cells of silver japanese eels anguilla japonica treated with human chorionic gonadotropin



Bulletin of the Faculty of Fisheries Hokkaido University 30(1): 23-33



Testicular interstitial cells of silver males of the Japanese eel, A. japonica, are present as prominent clusters of several cells in the interlobular spaces. They are characterized ultrastructurally by having relatively evident cytoplasmic organelles such as a poorly developed smooth endoplasmic reticulum, mitochondria with lamellar cristae, a large amount of free ribosomes and an ill-developed Golgi complex. Administrations of human chorionic gonadotropin (hCG) to the immature silver males could induce a rapid occurrence of spermatogenesis resulting in a complete maturation of testes. The treatment caused simultaneous changes in the ultrastructure of testicular interstitial cells. Mitochondria, which showed a considerable increase both in size and in number, underwent conspicuous elongation and became provided with a large number of tubular cristae. Smooth endplasmic reticulum with tubular and vesicular cisternae was increased in amount gradually as hCG injections were repeated. Numerous free ribosomes came to be scattered in rosettes throughout the cytoplasm, and the Golgi complex appeared to be increased in size and complexity in the hCG-stimulated interstitial cells. Testicular interstitial cells of silver males of the Japanese eel are apparently responsive to hCG to develop their steroidogenic function.

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Accession: 006857434

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