Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon
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 riv...
Published in: | General and Comparative Endocrinology |
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Online Access: | http://hdl.handle.net/2115/42619 https://doi.org/10.1016/j.ygcen.2009.07.005 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/42619 2023-05-15T15:43:28+02:00 Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon Onuma, Takeshi A. Makino, Keita Katsumata, Hiroshi Beckman, Brian R. Ban, Masatoshi Ando, Hironori Fukuwaka, Masa-aki Azumaya, Tomonori Swanson, Penny Urano, Akihisa http://hdl.handle.net/2115/42619 https://doi.org/10.1016/j.ygcen.2009.07.005 eng eng Elsevier http://hdl.handle.net/2115/42619 General and Comparative Endocrinology, 165(2): 237-243 http://dx.doi.org/10.1016/j.ygcen.2009.07.005 Spawning migration Chum salmon Growth IGF-I Liver Gonad Gonadotropin Androgen Estrogen Pituitary-gonadal axis 487 article (author version) fthokunivhus https://doi.org/10.1016/j.ygcen.2009.07.005 2022-11-18T01:01:56Z 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. Article in Journal/Newspaper Bering Sea Alaska Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Bering Sea Gulf of Alaska General and Comparative Endocrinology 165 2 237 243 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Spawning migration Chum salmon Growth IGF-I Liver Gonad Gonadotropin Androgen Estrogen Pituitary-gonadal axis 487 |
spellingShingle |
Spawning migration Chum salmon Growth IGF-I Liver Gonad Gonadotropin Androgen Estrogen Pituitary-gonadal axis 487 Onuma, Takeshi A. Makino, Keita Katsumata, Hiroshi Beckman, Brian R. Ban, Masatoshi Ando, Hironori Fukuwaka, Masa-aki Azumaya, Tomonori Swanson, Penny Urano, Akihisa Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
topic_facet |
Spawning migration Chum salmon Growth IGF-I Liver Gonad Gonadotropin Androgen Estrogen Pituitary-gonadal axis 487 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Onuma, Takeshi A. Makino, Keita Katsumata, Hiroshi Beckman, Brian R. Ban, Masatoshi Ando, Hironori Fukuwaka, Masa-aki Azumaya, Tomonori Swanson, Penny Urano, Akihisa |
author_facet |
Onuma, Takeshi A. Makino, Keita Katsumata, Hiroshi Beckman, Brian R. Ban, Masatoshi Ando, Hironori Fukuwaka, Masa-aki Azumaya, Tomonori Swanson, Penny Urano, Akihisa |
author_sort |
Onuma, Takeshi A. |
title |
Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
title_short |
Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
title_full |
Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
title_fullStr |
Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
title_full_unstemmed |
Changes in the plasma levels of insulin-like growth factor-I from the onset of spawning migration through upstream migration in chum salmon |
title_sort |
changes in the plasma levels of insulin-like growth factor-i from the onset of spawning migration through upstream migration in chum salmon |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/42619 https://doi.org/10.1016/j.ygcen.2009.07.005 |
geographic |
Bering Sea Gulf of Alaska |
geographic_facet |
Bering Sea Gulf of Alaska |
genre |
Bering Sea Alaska |
genre_facet |
Bering Sea Alaska |
op_relation |
http://hdl.handle.net/2115/42619 General and Comparative Endocrinology, 165(2): 237-243 http://dx.doi.org/10.1016/j.ygcen.2009.07.005 |
op_doi |
https://doi.org/10.1016/j.ygcen.2009.07.005 |
container_title |
General and Comparative Endocrinology |
container_volume |
165 |
container_issue |
2 |
container_start_page |
237 |
op_container_end_page |
243 |
_version_ |
1766377609323610112 |