HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
理学院・理学研究院  >
雑誌発表論文等  >

Expression of GnRH genes is elevated in discrete brain loci of chum salmon before initiation of homing behavior and during spawning migration

Supplementary figures.pdfSupplementary figures72.66 kBPDF見る/開く
GCE168-3_356-368.pdf392.44 kBPDF見る/開く

タイトル: Expression of GnRH genes is elevated in discrete brain loci of chum salmon before initiation of homing behavior and during spawning migration
著者: Onuma, Takeshi A. 著作を一覧する
Makino, Keita 著作を一覧する
Ando, Hironori 著作を一覧する
Ban, Masatoshi 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
Urano, Akihisa 著作を一覧する
キーワード: Spawning migration
Chum salmon
Gonadotropin-releasing hormone
Pituitary-gonadal axis
発行日: 2010年 9月15日
出版者: Elsevier
誌名: General and Comparative Endocrinology
巻: 168
号: 3
開始ページ: 356
終了ページ: 368
出版社 DOI: 10.1016/j.ygcen.2010.05.001
抄録: Our previous studies suggested the importance of gonadotropin-releasing hormones (GnRHs) for initiation of spawning migration of chum salmon, although supporting evidence had been not available from oceanic fish. In farmed masu salmon, the amounts of salmon GnRH (sGnRH) mRNAs in the forebrain increased in the pre-pubertal stage from winter through spring, followed by a decrease toward summer. We thus hypothesized that gene expression for GnRHs in oceanic chum salmon changes similarly, and examined this hypothesis using brain samples from winter chum salmon in the Gulf of Alaska and summer fish in the Bering Sea. They were classified into sexually immature and maturing adults, which had maturing gonads and left the Bering Sea for the natal river by the end of summer. The absolute amounts of GnRH mRNAs were determined by real-time PCRs. The amounts of sGnRH mRNA in the maturing winter adults were significantly larger than those in the maturing summer adults. The amounts of sGnRH and chicken cGnRH-II mRNAs then peaked during upstream migration from the coast to the natal hatchery. Such changes were observed in various brain loci including the olfactory bulb, terminal nerve, ventral telencephalon, nucleus preopticus parvocellularis anterioris, nucleus preopticus magnocellularis and midbrain tegmentum. These results suggest that sGnRH neurons change their activity for gonadal maturation prior to initiation of homing behavior from the Bering Sea. The present study provides the first evidence to support a possible involvement of neuropeptides in the onset of spawning migration.
資料タイプ: article (author version)
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


本サイトに関するご意見・お問い合わせは repo at へお願いします。 - 北海道大学