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• W2001897784 abstract "In order to check the quality of in vitro spermatogenesis of Japanese eel, in vitro11-ketotestosterone (11-KT) induced spermatogenesis was compared with in vivo spermatogenesis induced by a single injection of human chorionic gonadotropin (hCG) in detail. DNA contents of germ cells from in vitro and in vivo testicular fragments were compared using flow cytometry. Since the in vitro result of flow cytometry showed prominent 1C peak including spermatozoa and spermatids, the reduction of DNA by meiosis was assumed to progress normally, (i.e., haploid spermatozoa were produced in this in vitro system). In the testes of in vitro culture, however, spermatozoa were not released into lumen. Furthermore, the number of mitotic divisions of the in vitro experiment (6 divisions) was fewer than that of in vivo (10 divisions). In electron microscopy observations, both of in vivo and in vitro spermatozoon had a crescent-shaped nucleus with a flagellum, and a single large spherical mitochondrion. However, the elongation of the sperm head was not sufficient and the mitochondrion was not always located at the anterior end as is observed for the spermatozoa obtained from hCG injected eels. Eel spermatogenesis related substance-11 (eSRS11) is homologue of histone H1 which is up-regulated during spermatogenesis. Using this probe, in vitro spermatogenesis was also evaluated in molecular levels. In Northern blot analysis, eSRS11 mRNA was detected in both in vivo and in vitro testes. However, the expression of in vitro was much weaker than that of in vivo. These differences indicate that the stimulation of 11-KT is not sufficient, and another factors are needed to induce complete spermatogenesis in vitro." @default.
• W2001897784 created "2016-06-24" @default.
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• W2001897784 date "2002-03-01" @default.
• W2001897784 modified "2023-09-25" @default.
• W2001897784 title "Comparative Studies betweenin vivoandin vitroSpermatogenesis of Japanese Eel (Anguilla japonica)" @default.
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• W2001897784 doi "https://doi.org/10.2108/zsj.19.321" @default.
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