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GnRH Analog Stimulates Gonadotropin II Gene Expression in Maturing Sockeye Salmon

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Title: GnRH Analog Stimulates Gonadotropin II Gene Expression in Maturing Sockeye Salmon
Authors: Kitahashi, Takashi Browse this author
Alok, Deoraj Browse this author
Ando, Hironori Browse this author
Kaeriyama, Masahide Browse this author →KAKEN DB
Zohar, Yonathan Browse this author
Ueda, Hiroshi Browse this author →KAKEN DB
Urano, Akihisa Browse this author
Issue Date: Oct-1998
Publisher: 日本動物学会
Journal Title: Zoological Science
Volume: 15
Issue: 5
Start Page: 761
End Page: 765
Abstract: Our previous study suggested that, in the pituitaries of pre-spawning chum salmon, salmon gonadotropin-releasing hormone (sGnRH) stimulates expression of genes for gonadotropin (GTH) IIβ but not for Iβ, since the levels of mRNAs encoding sGnRH and GTH II but not I were increased during the final stages of spawning migration. In the present study, a capsule of GnRH analog (GnRHa) was implanted into the dorsal muscle of maturing sockeye salmon to clarify function of GnRH on expression of GTH subunit genes in pre-spawning homing salmonids. The amounts of GTH subunit mRNAs in the individual pituitaries were analyzed by a quantitative dot blot analysis using single-stranded sense DNA as the standard. The levels of GTHαand IIβ mRNAs in the GnRHa-implanted fish were significantly higher than those in the control fish in both the males and females, whereas the levels of GTH Iβ mRNA did not show any significant differences in both sexes. These results indicate that GnRH elevates expression of GTH subunit genes which encode the components of GTH II, α and IIβ chains, in the pituitary of maturing sockeye salmon, and then accelerates final maturation.
Rights: (c) 日本動物学会 / 本文献の公開は著者の意思に基づくものである
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上田 宏

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