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Seasonal Variation in the Expression of Five Subtypes of Gonadotropin-releasing Hormone Receptor Genes in the Brain of Masu Salmon from Immaturity to Spawning
| Title: | Seasonal Variation in the Expression of Five Subtypes of Gonadotropin-releasing Hormone Receptor Genes in the Brain of Masu Salmon from Immaturity to Spawning |
| Authors: | Jodo, Aya Browse this author | | Kitahashi, Takashi Browse this author | | Taniyama, Shinya Browse this author | | Bhandari, Ramji Kumar Browse this author | | Ueda, Hiroshi Browse this author →KAKEN DB | | Urano, Akihisa Browse this author | | Ando, Hironori Browse this author |
| Keywords: | GnRH receptor | | gene expression | | brain | | seasonal reproduction | | spawning behavior | | real-time PCR |
| Issue Date: | Dec-2005 |
| Publisher: | 日本動物学会 |
| Journal Title: | Zoological Science |
| Volume: | 22 |
| Issue: | 12 |
| Start Page: | 1331 |
| End Page: | 1338 |
| Abstract: | Seasonal variation in the expression of five subtypes of gonadotropin-releasing hormone receptor (GnRH-R) genes, designated as msGnRH-R1, -R2, -R3, -R4, and -R5, was examined in the brain of masu salmon (Oncorhynchus masou). In addition, responses of these genes to GnRH were examined in a GnRH analog (GnRHa) implantation experiment. Brain samples were collected one week after the implantation every month from immaturity through spawning. The absolute amount of GnRH-R mRNA in single forebrains was determined by real-time PCR assays. Among the five genes, R4 and R5 were dominantly expressed in both sexes. R1, R4, and R5 mRNAs showed similar changes throughout the experimental period in both sexes. Levels tended to be high in winter and low in the pre-spawning season, followed by elevations in the spawning period. The mRNA levels had weak to moderate negative correlations with the plasma level of estradiol-17β (E2) in females. The effects of GnRHa on msGnRH-R mRNAs were not apparent for all the subtypes. These results indicate that the msGnRH-R1, -R4, and -R5 genes are synchronously expressed during sexual maturation. There was a trend toward decreased levels of their expression prior to the spawning period and then increased levels at spawning, possibly causing GnRH target neurons to sensitize to a GnRH stimulus. Furthermore, E2 may be involved in msGnRH-R gene expression in the brain of female masu salmon during sexual maturation. |
| Rights: | (c) 日本動物学会 / 本文献の公開は著者の意思に基づくものである |
| Relation: | http://www.bioone.org/perlserv/?request=get-archive&issn=0289-0003 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/32970 |
| 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)
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Submitter: 上田 宏
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