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Involvement of hormones in olfactory imprinting and homing in chum salmon

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Title: Involvement of hormones in olfactory imprinting and homing in chum salmon
Authors: Ueda, Hiroshi Browse this author →KAKEN DB
Nakamura, Shingo Browse this author
Nakamura, Taro Browse this author
Inada, Kaoru Browse this author
Okubo, Takashi Browse this author
Furukawa, Naohiro Browse this author
Murakami, Reiichi Browse this author
Tsuchida, Shigeo Browse this author
Zohar, Yonathan Browse this author
Konno, Kotaro Browse this author
Watanabe, Masahiko Browse this author
Issue Date: 17-Feb-2016
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 6
Start Page: 21102
Publisher DOI: 10.1038/srep21102
Abstract: The olfactory hypothesis for salmon imprinting and homing to their natal stream is well known, but the endocrine hormonal control mechanisms of olfactory memory formation in juveniles and retrieval in adults remain unclear. In brains of hatchery-reared underyearling juvenile chum salmon (Oncorhynchus keta), thyrotropin-releasing hormone gene expression increased immediately after release from a hatchery into the natal stream, and the expression of the essential NR1 subunit of the N-methyl-D-aspartate receptor increased during downstream migration. Gene expression of salmon gonadotropin-releasing hormone (sGnRH) and NR1 increased in the adult chum salmon brain during homing from the Bering Sea to the natal hatchery. Thyroid hormone treatment in juveniles enhanced NR1 gene activation, and GnRHa treatment in adults improved stream odour discrimination. Olfactory memory formation during juvenile downstream migration and retrieval during adult homing migration of chum salmon might be controlled by endocrine hormones and could be clarified using NR1 as a molecular marker.
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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