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Transgenic fluorescent zebrafish as tools to characterize prostaglandin EP4 receptor gene expression and to discover drug candidates for abdominal aorta aneurysm

Research Project

Project/Area Number 20K17730
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 55030:Cardiovascular surgery-related
Research InstitutionTokyo Medical University

Principal Investigator

TANIFUJI Shota  東京医科大学, 医学部, 助教 (50529245)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsゼブラフィッシュ / EP4 / 腹部大動脈瘤 / アンジオテンシンII / 薬剤スクリーニング / 疾患モデル動物 / プロスタグランディン受容体 / 弾性線維
Outline of Research at the Start

腹部大動脈瘤 (AAA) は、慢性炎症により弾性線維が破壊されて血管壁が脆くなり、瘤化して破裂に至る進行性の致死性疾患であるが、進行を抑制する薬物療法は存在しない。AAAで多く産生されるPGE2は病態進行に関与し、AAA組織で増加するPGE2受容体EP4のシグナル抑制が治療となり得る。本研究では、①EP4遺伝子発現を可視化できるゼブラフィッシュを用いて、EP4発現を誘導する化合物を探索し、発現制御の分子機序を解明する。②AAAモデルゼブラフィッシュを開発し、①で見出したEP4発現を抑制する薬剤の効果を検証する。本研究は、根本的治療法のないAAAの治療薬開発への貢献が期待される。

Outline of Final Research Achievements

The PGE receptor EP4 is distributed in various cells to maintain homeostasis. In abdominal aortic aneurysms (AAA), excessive EP4 expression has been implicated in the progression of the disease, but the mechanism of excessive EP4 expression is unknown. In this study, we aimed to elucidate the molecular mechanism of EP4 expression and to search for compounds that inhibit EP4 expression as a new treatment for AAA. We generated transgenic zebrafish in which EP4 gene expression could be visualized in vivo, and EGFP expression was confirmed. In addition, administration of angiotensin II(AngII) to transgenic zebrafish with visualized blood vessels resulted in a 1.2-fold increase in the dorsal aortic diameter compared to buffer-injected controls at 5 days post-fertilization. AngII-injected 2-month-old zebrafish did not show evidence of aortic expansion, but elastic fiber formation was partly attenuated with enhanced matrix metalloproteinase-2 expression.

Academic Significance and Societal Importance of the Research Achievements

本研究で作製したEP4-EGFPレポーターゼブラフィッシュは、現時点で唯一EP4発現をin vivoで可視化でき、時間依存的な定量が可能となった遺伝子改変ゼブラフィッシュである。In vivo解析により、生体内環境でEP4発現の亢進をもたらす機序が明らかになれば、AAA等の過剰なEP4シグナルが関与する疾患の病態の理解に貢献ができると期待される。加えてAngII投与ゼブラフィッシュは、稚魚での大動脈径の増大を指標とすることで、治療薬候補となる化合物を短期間にin vivoで絞り込むことが可能であるため、現在までに根本的治療法のないAAAに対する新規の治療法開発への貢献度は高いと考えられる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2023 2022 2021

All Presentation (4 results) (of which Invited: 1 results)

  • [Presentation] Angiotensin II-treated zebrafish as a new experimental model to study vascular elastic fiber formation2023

    • Author(s)
      Shota Tanifuji, Genri Kawahara, Takashi Nakamura, Saki Iida, Yukiko Hayashi, Utako Yokoyama
    • Organizer
      The 100th Annual Meeting of the Physiological Society of Japan
    • Related Report
      2022 Annual Research Report
  • [Presentation] ゼブラフィッシュにおけるアンジオテンシンIIの血管への作用の検討2022

    • Author(s)
      谷藤章太, 川原玄理, 中村隆, 飯田早紀, 林由起子, 横山詩子
    • Organizer
      第190回東京医科大学医学会総会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A novel zebrafish model of aortic aneurysm2022

    • Author(s)
      Shota Tanifuji, Genri Kawahara, Takashi Nakamura, Saki Iida, Yukiko K. Hayashi, Utako Yokoyama
    • Organizer
      The 99th Annual Meeting of the Physiological Society of Japan
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Development of a novel zebrafish model for aortic aneurysm2021

    • Author(s)
      Shota Tanifuji, Genri Kawahara, Saki Iida, Yukiko K. Hayashi, Utako Yokoyama
    • Organizer
      The Joint Meeting of the 126th Annual Meeting of the Japanese Association of Anatomists and the 98th Annual Meeting of the Physiological Society of Japan
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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