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The significance of existence of ghrelin in non-mammals: a new effect of ghrelin on gastrointestinal tract, and construction of gene modified animals in non-mammalian vertebrates.

Research Project

Project/Area Number 17K07478
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Morphology/Structure
Research InstitutionNational Cardiovascular Center Research Institute

Principal Investigator

Kaiya Hiroyuki  国立研究開発法人国立循環器病研究センター, 研究所, 室長 (40300975)

Co-Investigator(Kenkyū-buntansha) 今野 紀文  富山大学, 学術研究部理学系, 講師 (50507051)
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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsグレリン / モチリン / グレリン受容体 / モチリン受容体 / 遺伝子欠損動物 / メダカ / 魚類 / 受容体欠損 / 摂食調節 / RNAseq / 脳 / 腎臓 / GHS-R / MLN-R / ネッタイツメガエル / TALEN / 消化酵素 / 受容体 / リガンド / 遺伝子改変動物 / 胃腸管
Outline of Final Research Achievements

In this study, KO Xenopus tropicalis lacking the ghrelin gene, and KO medaka lacking the ghrelin receptor or motilin receptor genes (GHSR-LR-KO and MLNR-KO) were generated. GHSR-LR-KO showed a decrease in food intake. In addition, RNA-seq analysis of MLNR-KO showed that gene expression of SMAD3, pvalb-1, NCCRP1, StAR in the kidney, and growth hormone, prolactin, luteinizing hormone and gametocyte-specific factor-1 in the brain were down-regulated. Thus, it is suggested that the ghrelin/GHS-R system is involved in feeding regulation, while the MLN/MLN-R system is involved in water and electrolyte metabolism, hematopoiesis, immunity, steroid hormone production and reproductive function in Medaka.

Academic Significance and Societal Importance of the Research Achievements

グレリンやそのファミリーホルモンであるモチリンの非哺乳類、両生類や魚類における存在意義はまだ不明な点が多い。本研究ではゲノム編集技術(TALEN)によりネッタイツメガエル、メダカにおいてノックアウト(KO)個体を作出し、個体レベルでの遺伝子欠損の影響を調べた。その結果、メダカにおいてグレリン・GHS-R系は摂食調節に、モチリン・MLN-R系は水・電解質代謝、造血、免疫、ステロイドホルモン産生、生殖機能に関わっている可能性が示唆され、哺乳類と類似する点、相相違する点があることが明らかとなった。特にモチリンは哺乳類において消化管運動調節のみが知られており、生体における新たな生理的役割が示唆された。

Report

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

    (9 results)

All 2020 2019 2018 2017

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Identification of pheasant ghrelin and motilin and their actions on contractility of the isolated gastrointestinal tract2020

    • Author(s)
      Zhang Shuangyi、Okuhara Yuji、Iijima Mio、Takemi Shota、Sakata Ichiro、Kaiya Hiroyuki、Teraoka Hiroki、Kitazawa Takio
    • Journal Title

      General and Comparative Endocrinology

      Volume: 285 Pages: 113294-113294

    • DOI

      10.1016/j.ygcen.2019.113294

    • NAID

      120007193495

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Regulation of Gastrointestinal Motility by Motilin and Ghrelin in Vertebrates.2019

    • Author(s)
      Kitazawa T, Kaiya H.
    • Journal Title

      Front Endocrinol (Lausanne)

      Volume: 10 Pages: 278-278

    • DOI

      10.3389/fendo.2019.00278

    • NAID

      120006901037

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural determination, distribution, and physiological actions of ghrelin in the guinea pig.2018

    • Author(s)
      Okuhara Y, Kaiya H, Teraoka H, Kitazawa T.
    • Journal Title

      Peptides

      Volume: 99 Pages: 70-81

    • DOI

      10.1016/j.peptides.2017.11.010

    • NAID

      120006798167

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Peripherally injected ghrelin and leptin reduce food hoarding and mass gain in the coal tit (Periparus ater).2018

    • Author(s)
      Henderson LJ, Cockcroft RC, Kaiya H, Boswell T, Smulders TV.
    • Journal Title

      Proc Biol Sci.

      Volume: 285 Issue: 1879 Pages: 1879-1879

    • DOI

      10.1098/rspb.2018.0417

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ghrelin, corticosterone and the resumption of migration from stopover, an automated telemetry study.2018

    • Author(s)
      Eikenaar C, Hessler S, Ballstaedt E, Schmaljohann H, Kaiya H.
    • Journal Title

      Physiol Behav.

      Volume: 194 Pages: 450-455

    • DOI

      10.1016/j.physbeh.2018.06.036

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Does motilin peptide regulate gastrointestinal motility of zebrafish? An in vitro study using isolated intestinal strips.2017

    • Author(s)
      Kitazawa T, Yoshida M, Teraoka H, Kaiya H.
    • Journal Title

      General and Comparative Endocrinology

      Volume: 印刷中 Pages: 15-23

    • DOI

      10.1016/j.ygcen.2017.02.014

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] メダカにおけるグレリン-モチリン系とそれら受容体の特徴づけ2019

    • Author(s)
      砂田沙也加、石原美穂、中町智哉、松田恒平、今野紀文、海谷啓之
    • Organizer
      第44回日本比較内分泌学会 埼玉大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 両生類においてグレリンは摂食調節に関与するか2017

    • Author(s)
      海谷啓之、寒川賢治、宮里幹也
    • Organizer
      第88回日本動物学会
    • Related Report
      2017 Research-status Report
  • [Presentation] Current knowledge of ghrelin in amphibians2017

    • Author(s)
      Hiroyuki Kaiya, Kenji Kangawa, Mikiya Miyazato
    • Organizer
      グレリン国際シンポジウム
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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

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