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Development of the gonadotropin secretion promotion technique using the Tiger puffer pituitary spheroid culture

Research Project

Project/Area Number 21K05727
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionKyushu University

Principal Investigator

Yamaguchi Akihiko  九州大学, 農学研究院, 助教 (10332842)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsスフェロイド / 下垂体 / ゴナドトロピン / アロマターゼ / トラフグ / 黄体形成ホルモン / 濾胞刺激ホルモン / 生理活性物質 / ニューロスフェアー / 幹細胞 / 3次元培養
Outline of Research at the Start

中・大型魚種(トラフグ・ニホンウナギ・クロマグロ・チョウザメ等)では初回成熟開始までの期間が長く早期成熟誘導の技術開発が望まれている。初回成熟時には生殖腺刺激ホルモン放出ホルモン(GnRH)を代表とする様々な生理活性物質が下垂体でゴナドトロピン(GTH)の分泌を促進し卵成熟の誘導が起きる。多種の生理活性物質を生体投与し成熟・産卵効果を検出する方法は、多大な労力が必要で確率性も低い。本研究ではトラフグ下垂体細胞のスフェロイド(細胞塊)培養を利用したin vitroスクリーニングによりGTHの分泌を促進する生理活性物質の探索を行うことで、様々な魚種に応用可能なスクリーニング技術の開発を目指す。

Outline of Final Research Achievements

Spheroids obtained through 3D cultivation of cells maintain properties close to those of living tissues, making them a valuable technique in drug discovery. The pituitary gland regulates various endocrine gland functions in the body, so using spheroids to monitor the reproductive physiology of fish could be effective in exploring bioactive substances useful for fish seed production. In this study, we created spheroids of the T.rubripes (torafugu) pituitary gland and validated their effectiveness. By analyzing the function of brain-type aromatase in luteinizing hormone-producing cells and the proliferation and hormone synthesis of follicle-stimulating hormone and luteinizing hormone-producing cells using annual serum, it was suggested that pituitary gland spheroids mimic biological functions. Spheroid assays have been proven to be effective techniques for exploring bioactive substances and other purposes.

Academic Significance and Societal Importance of the Research Achievements

中・大型の魚種では初回成熟までの期間が長く、生殖殖腺刺激ホルモンの合成 分泌の早期誘導の技術開発が必要である。本研究ではトラフグを用い下垂体スフェロイドアッセイ法を確立した。数個の下垂体から数千のスフェロイドが作製でき、生体調査の難しい魚種(クロマグロ等)へも応用できる。トラフグ周年血清を用いたアッセイでは産卵半年前に下垂体細胞の増殖が確認され、成熟開始期の飼育管理の重要性を示した。また黄体形成ホルモンの合成は性ステロイドに反応するが濾胞刺激ホルモンは関係なくスフェロイド内で自律的に合成した。これらの結果は魚類下垂体スフェロイドアッセイが基礎から応用まで幅広く貢献する事を意味する。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (11 results)

All 2024 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (5 results)

  • [Journal Article] Evaluation of fish pituitary spheroids to study annual endocrine reproductive control2024

    • Author(s)
      Yamaguchi Akihiko
    • Journal Title

      General and Comparative Endocrinology

      Volume: 351 Pages: 114481-114481

    • DOI

      10.1016/j.ygcen.2024.114481

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pituitary luteinizing hormone synthesis starts in aromatase (cyp19a1b)-positive cells expressing esr1 and esr2b at the onset of puberty in Takifugu rubripes (fugu)2022

    • Author(s)
      Yamaguchi Akihiko、Tsunematsu Tomoko、Motojima Yoshihiro、Toriyama Kanako、Horinouchi Asami、Ishii Yukari、Murata Hanezu、Yoshikawa Sota、Nyuji Mitsuo、Shimizu Akio
    • Journal Title

      Cell and Tissue Research

      Volume: 389 Issue: 2 Pages: 259-287

    • DOI

      10.1007/s00441-022-03629-6

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Divulging the social sex change mechanism in a unique model system for studying the sexual plasticity of protogynous hermaphrodite fish, three bamboo leaf wrasse (Pseudolabrus sieboldi)2022

    • Author(s)
      Chakraborty Tapas、Yamamoto Yume、Hanai Shoma、Hirano Mayumi、Mohapatra Sipra、Yamaguchi Akihiko、Takeda Tatsusuke、Matsuyama Michiya、Ohta Kohei
    • Journal Title

      Frontiers in Marine Science

      Volume: 9 Pages: 1048506-1048506

    • DOI

      10.3389/fmars.2022.1048506

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular Characterisation and Reporter Gene Assay ofthe Three GnRH Isoforms and Two GnRH Receptors of a Clupeiform Fish, Japanese Sardine, Sardinops sagax melanostictus (Temminck & Schlegel, 1846)2022

    • Author(s)
      LUMAYNO SANNY DAVID PACHECO、OHTA KOHEI、YAMAGUCHI AKIHIKO、MATSUYAMA MICHIYA
    • Journal Title

      Asian Fisheries Science

      Volume: 35 Issue: 1 Pages: 26-43

    • DOI

      10.33997/j.afs.2022.35.1.003

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multiplicity of gonadotropin-releasing hormone in fish2021

    • Author(s)
      Selvaraj S、Ahilan B、Yamaguchi A、Matsuyama M
    • Journal Title

      Journal of Entomology and Zoology Studies

      Volume: 9 Issue: 3 Pages: 352-361

    • DOI

      10.22271/j.ento.2021.v9.i3e.8729

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] トラフグ下垂体から均一なスフェロイドを作製するための最適な培養条件の評価2021

    • Author(s)
      山口明彦
    • Journal Title

      nova biomedical: customer focus: Researcher's interview

      Volume: -

    • Related Report
      2021 Research-status Report
  • [Presentation] トラフグ下垂体スフェロイドを利用した性ステロイドフィードバック機構の解析2023

    • Author(s)
      山口明彦
    • Organizer
      第37回日本下垂体研究会学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] トラフグ下垂体スフェロイドを利用した細胞増殖とゴナドトロピン合成活性の周年モニタリング2023

    • Author(s)
      山口明彦
    • Organizer
      日本動物学会第94回大会(山形)
    • Related Report
      2023 Annual Research Report
  • [Presentation] トラフグ下垂体スフェロイド培養系の開発とゴナドトロピン合成機構の解明2021

    • Author(s)
      山口明彦
    • Organizer
      日本動物学会第92回大会(オンライン米子大会)
    • Related Report
      2021 Research-status Report
  • [Presentation] トラフグ下垂体スフェロイドの効率的培養法の確立とゴナドトロピン産生機能の検証2021

    • Author(s)
      山口明彦
    • Organizer
      第35回日本下垂体研究会学術集会 (福岡国際会議場)
    • Related Report
      2021 Research-status Report
  • [Presentation] 下垂体スフェロイドを用いたトラフグ初回成熟機構の解析2021

    • Author(s)
      山口明彦
    • Organizer
      三学会合同福岡大会(九州大学伊都キャンパス)
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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