Y
Yoshitaka Nagahama
Researcher at National Institute for Basic Biology, Japan
Publications - 5
Citations - 876
Yoshitaka Nagahama is an academic researcher from National Institute for Basic Biology, Japan. The author has contributed to research in topics: Japanese eel & Spermatogenesis. The author has an hindex of 5, co-authored 5 publications receiving 839 citations. Previous affiliations of Yoshitaka Nagahama include Jiwaji University.
Papers
More filters
Journal ArticleDOI
Endocrine regulation of gametogenesis in fish.
TL;DR: Findings on the identification of steroidal mediators involved in each process of gametogenesis, and the sites and mechanisms of action of the mediators are reviewed.
Journal ArticleDOI
Human Recombinant Activin Induces Proliferation of Spermatogonia in vitro in the Japanese Eel Anguilla japonica
Journal ArticleDOI
Fish testicular 11β-hydroxylase : cDNA cloning and mRNA expression during spermatogenesis
Jian-Qiao Jianga,Tohru Kobayashi,Wei Ge,Hiroko Kobayashi,Minoru Tanaka,Mitsuhiro Okamoto,Yasuki Nonaka,Yoshitaka Nagahama +7 more
TL;DR: A cDNA encoding testicular 11β‐hydroxylase, cytochrome P450(11β) from the Japanese eel (Anguilla japonica) testis was isolated and characterized and transient expression in COS 1 cells confirmed that the protein encoded by this cDNA had P 450( 11β) activity.
Book ChapterDOI
The onset of spermatogenesis in fish.
TL;DR: It is shown that hormonal induction of spermatogenesis in eel testes involves gonadotropin stimulation of Leydig cells to produce 11-ketotestosterone, a potent androgen in fish.
Journal ArticleDOI
A rapid activation of immature testis of Japanese eel (Anguilla japonica) by a single injection of human chorionic gonadotropin
TL;DR: A single injection of human chorionic gonadotropin induced marked changes in the morphology of the testis and in the serum androgen levels within a period of 72 h, including spermatogonial proliferation, activation of Leydig and Sertoli cells, organization of seminiferous lobules and formation of lobular lumen in the testes.