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Construction of molecular basis of reproductive endocrine system of shark and application to artificial spawning technology

Research Project

Project/Area Number 17K07472
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Morphology/Structure
Research InstitutionUniversity of Miyazaki

Principal Investigator

UCHIDA Katsuhisa  宮崎大学, 農学部, 教授 (50360508)

Co-Investigator(Kenkyū-buntansha) 森山 俊介  北里大学, 海洋生命科学部, 教授 (50222352)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords板鰓類 / 繁殖生理学 / 進化 / 生殖ホルモン / 孵化酵素 / 卵殻腺 / ホルモン / サメ類 / 比較内分泌学 / 魚類生理学 / 魚類繁殖生理学 / 魚類発生学 / 繁殖生理 / 軟骨魚類 / 比較内分泌 / 卵殻形成
Outline of Final Research Achievements

To develop the artificial spawning technology for sharks, we aimed to understand the molecular background of the reproductive endocrine system and the functional aspect of eggshell gland hatching glands, which have not been elucidated so far. First, we histologically showed the four functional secretory layers of the eggshell glands of the female cloudy catshark, Scyliorhinus torazame and indicated that the major secretory layer contributes to collagen synthesis at the molecular level. Second, we identified three GnRH genes and four GnRH receptor genes from the shark brain, and demonstrated that shark GnRH may regulate the pituitary FSH functions. Thirdly, we have identified the hatching gland in the head of the catshark, and have revealed the molecular structure of hatching enzyme that expressed in epithelial cells of hatching gland for the first time in sharks by next-generation sequence analysis.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により、サメ類の生殖輸管系と生殖関連ホルモンの機能や胚の孵化に関する仕組みの一端が理解できた。これらの成果は、単に、トラザメの繁殖生理・内分泌機構に関する知見の発信に留まらず、真骨魚類での先行知見との比較や、軟骨魚類から卵生の陸棲脊椎動物へと引き継がれた卵殻形成機構の分子基盤とその進化の理解に繋がり、基礎動物学や繁殖生理学、比較内分泌学分野に新たな知見と学術進展を発信できると考える。また、近い将来、本研究の成果は、トラザメの人為産卵促進技術の開発に繋がると考えられ、世界のサメ繁殖生理学研究を牽引し、サメ資源の保護や増産のための方策を生み出すことが可能と考えている。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2017 Other

All Int'l Joint Research (1 results) Presentation (6 results) (of which Int'l Joint Research: 1 results) Book (1 results)

  • [Int'l Joint Research] 済州大学/韓国海洋科学技術研究所(韓国)

    • Related Report
      2018 Research-status Report
  • [Presentation] 板鰓類トラザメにおける孵化腺および孵化酵素の同定2019

    • Author(s)
      6.宮西 弘、石田伶音、工樂樹洋、増田元保、高木 亙、兵藤 晋、内田勝久
    • Organizer
      日本動物学会第90回大会(大阪)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 軟骨魚類・板鰓類にも生殖に寄与する視床下部-下垂体機能軸はあるのか?2019

    • Author(s)
      内田勝久、横山裕麻、増田元保、宮西 弘、香川浩彦
    • Organizer
      日本下垂体研究会第34回学術集会(松江)
    • Related Report
      2019 Annual Research Report
  • [Presentation] トラザメ胚のPre-hatchingに伴う頭頂部組織の形態学的変化について2018

    • Author(s)
      石田伶音、増田元保、宮西 弘、香川浩彦、内田勝久
    • Organizer
      第71回日本動物学会九州支部大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Molecular and cellular evidences for shark GnRHs and their receptors in the brain2018

    • Author(s)
      Katsuhisa Uchida, Yuma Yokoyama, Kazuaki Yamaguchi, Shigehiro Kuraku, Hiroshi Miyanishi and Hirohiko Kagawa
    • Organizer
      Asia and Oceania Society for Comparative Endocrinology Intercongress (AOSCE)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 板鰓類・トラザメにおける生殖内分泌因子群の同定と機能の探索2018

    • Author(s)
      内田勝久、横山裕麻、山口和晃、工樂樹洋、宮西 弘、香川浩彦
    • Organizer
      第89回日本動物学会札幌大会
    • Related Report
      2018 Research-status Report
  • [Presentation] トラザメの卵殻腺における機能関連分子の探索2017

    • Author(s)
      内田吉亮、横山裕麻、古川史也、宮西弘、香川浩彦、内田勝久
    • Organizer
      日本動物学会第88回富山大会
    • Related Report
      2017 Research-status Report
  • [Book] 動物学の百科事典2018

    • Author(s)
      内田勝久(研究代表者)
    • Total Pages
      800
    • Publisher
      丸善出版
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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