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Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon

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タイトル: Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon
著者: Onuma, Takeshi A. 著作を一覧する
Makino, Keita 著作を一覧する
Katsumata, Hiroshi 著作を一覧する
Beckman, Brian R. 著作を一覧する
Ban, Masatoshi 著作を一覧する
Ando, Hironori 著作を一覧する
Fukuwaka, Masa-aki 著作を一覧する
Azumaya, Tomonori 著作を一覧する
Swanson, Penny 著作を一覧する
Urano, Akihisa 著作を一覧する
キーワード: Spawning migration
Chum salmon
Growth
IGF-I
Liver
Gonad
Gonadotropin
Androgen
Estrogen
Pituitary-gonadal axis
発行日: 2010年 1月15日
出版者: Elsevier
誌名: General and Comparative Endocrinology
巻: 165
号: 2
開始ページ: 237
終了ページ: 243
出版社 DOI: 10.1016/j.ygcen.2009.07.005
抄録: An increase in activity of the pituitary-gonadal axis (PG-axis) and gonadal development are essential for the onset of spawning migration of chum salmon from the Bering Sea. In the Bering Sea, fish with larger body sizes initiated gonadal development and commenced spawning migration to the natal river by the end of summer. We thus hypothesized that insulin-like growth factor-I (IGF-I), a somatotropic signal that interacts with the PG-axis, can be one of such factors responsible for the onset of migration, and examined changes in plasma levels and hepatic expression of IGF-I gene in oceanic and homing chum salmon in 2001, 2002 and 2003. The plasma IGF-I levels and corresponding body sizes in maturing adults, which had developing gonads, were significantly higher than those in immature fish in all years examined. Such increase in the plasma IGF-I levels in maturing fish was observed even in the Gulf of Alaska during February 2006, while coincident increase was not observed in the hepatic amounts of IGF-I mRNA. In autumn, the plasma IGF-I levels in homing adults decreased during upstream migration in the Ishikari River-Ishikari bay water system in Hokkaido, Japan. In conclusion, the plasma IGF-I levels increased with gonadal development when chum salmon migrated from the winter Gulf of Alaska to the summer Bering Sea. Circulating IGF-I may interact with the PG-axis and promote gonadal development that is inseparable from the onset of spawning migration. Circulating IGF-I levels were thereafter lowered in accordance with final maturation during upstream migration in the breeding season.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/42619
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 浦野 明央

 

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