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Yoshitaka Nagahama
Researcher at National Institute for Basic Biology, Japan
Publications - 12
Citations - 1426
Yoshitaka Nagahama is an academic researcher from National Institute for Basic Biology, Japan. The author has contributed to research in topics: Gonadotropin & Ovarian follicle. The author has an hindex of 12, co-authored 12 publications receiving 1400 citations.
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Isolation and characterization of two distinct gonadotropins from chum salmon pituitary glands
TL;DR: The results suggest the presence in teleost fish of two chemically distinct gonadotropic glycoproteins, composed of two distinct subunits with N-terminal amino acid residues of Tyr/Gly for GTH I, and Tyr/Ser forGTH II.
Journal Article
Gonadotropin action on gametogenesis and steroidogenesis in teleost gonads
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Steroidogenic activities of two distinct salmon gonadotropins.
TL;DR: GTH II appears to differ from GTH I showing a reproductively high specificity for 17 alpha,20 beta-diOHprog production during oocyte maturation.
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The duality of teleost gonadotropins.
Hiroshi Kawauchi,Kunimasa Suzuki,Hiromichi Itoh,Penny Swanson,Nobuko Naito,Yoshitaka Nagahama,Masumi Nozaki,Y. Nakai,Seiga Itoh +8 more
TL;DR: The existence of two pituitary gonadotropins in teleosts as well as tetrapods suggests that the divergence of the GTH gene took place earlier than the time of divergence ofteleosts from the main line of evolution leading to tetrapod.
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Development of salmon GTH I and GTH II radioimmunoassays
TL;DR: Radioimmunoassays (RIAs) for the measurement of two gonadotropins, GTH I and GTH II, in the plasma and pituitary of salmonid fish were developed using a rabbit antiserum to beta-subunits of chum salmon G TH I andGTH II using as standards and radioactive competitors.