Seasonal Variation in the Expression of Five Subtypes of Gonadotropin-releasing Hormone Receptor Genes in the Brain of Masu Salmon from Immaturity to Spawning

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概要

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• 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.

• 社団法人日本動物学会の論文
• 2005-12-25

著者

• Urano Akihisa

  Division Of Biological Sciences Graduate School Of Science Hokkaido University

• Bhandari Ramji

  Sesoko Station Tropical Biosphere Research Center University Of The Ryukyus

• Kitahashi Takashi

  Field Science Center for Northern Biosphere, Hokkaido University

• Ando Hironori

  Division of Biological Sciences, Graduate School of Science, Hokkaido University

• Jodo Aya

  Division of Biological Sciences, Graduate School of Science, Hokkaido University

• UEDA Hiroshi

  Field Science Center for Northern Biosphere, Hokkaido University

• Bhandari R

  Field Science Center For Northern Biosphere Hokkaido University

• Taniyama Shinya

  Division of Marine Biological Sciences, Graduate School of Fisheries Science, Hokkaido University

• Bhandari Ramji

  Field Science Center for Northern Biosphere, Hokkaido University

• Jodo Aya

  Section Of Biological Sciences Graduate School Of Life Science Hokkaido University

• Urano Akihisa

  Laboratory Of Molecular Biology Ocean Research Institute University Of Tokyo

• Ueda H

  Field Science Center For Northern Biosphere Hokkaido University

• Ando Hironori

  Division Of Biological Sciences Graduate School Of Science Hokkaido University

• Ando J

  Division Of Biological Sciences Graduate School Of Science Hokkaido University

• Ando Hironori

  Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy

• Urano Akihisa

  Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy

• Urano Akihisa

  Field Science Center For Northern Biosphere Hokkaido University

• Urano Akihisa

  Division Of Biological Science Graduate School Of Life Science Hokkaido University

• Bhandari Ramji

  Field Science Center For Northern Biosphere Hokkaido University

• Ueda H

  Field Sci. Ctr. Hokkaido Univ.

• Ueda Hiroshi

  Field Science Center For Northern Biosphere Hokkaido University

• Ueda Hiroshi

  Department Of Dermatology Fujita Health University School Of Medicine

• Taniyama Shinya

  Division Of Marine Biological Sciences Graduate School Of Fisheries Science Hokkaido University

• Kitahashi Takashi

  Field Science Center For Northern Biosphere Hokkaido University

• Jodo Aya

  Division Of Biological Sciences Graduate School Of Science Hokkaido University

• TANIYAMA Shinya

  Division of Biological Sciences, Graduate school of Science, Hokkaido University

• Urano Akihisa

  Division of Biological Sciences, Graduate School of Science, Hokkaido University:Field Science Center for Northern Biosphere, Hokkaido University

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