Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon
スポンサーリンク
概要
- 論文の詳細を見る
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.
- 2010-01-15
著者
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Makino Keita
Section Of Biological Science Faculty Of Science Hokkaido University
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Fukuwaka Masa-aki
Hokkaido National Fisheries Research Institute
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Onuma T
Central Research Laboratory Matsushita Electric Industrial Co. Ltd.
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Urano Akihisa
Laboratory Of Molecular Biology Ocean Research Institute University Of Tokyo
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Ando Hironori
Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy
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Urano Akihisa
Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy
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Urano Akihisa
Field Science Center For Northern Biosphere Hokkaido University
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Fukaya M
Central Research Institute Mitsukan Group Corporation
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