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Uncovering the Pathogenesis of Selective Insulin Resistance through FoxO1 and PPARA Regulation

Research Project

Project/Area Number 22K16422
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 54040:Metabolism and endocrinology-related
Research InstitutionChiba University

Principal Investigator

Kitamoto Takumi  千葉大学, 医学部附属病院, 助教 (90916173)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords糖尿病 / 脂質異常症 / インスリン抵抗性 / 肥満 / FoxO1 / PPARA / Foxo1 / 2型糖尿病 / 糖産生 / PPARα
Outline of Research at the Start

2型糖尿病は、膵β細胞からのインスリン分泌不全とインスリン作用障害により生じる慢性高血糖を主徴とする代謝性疾患である。肝細胞のインスリン作用障害時に惹起される高血糖は、インスリンシグナル下流で活性制御を受ける転写因子FoxO1をノックアウト(KO)することで正常化する。しかし、その全体像は技術的な問題から未解明であった。本研究は申請者グループが近年明らかにした成果(Kitamoto et al. PNAS, 2021)に基づき、インスリンシグナル下流にある糖代謝制御特異的な標的遺伝子を特定することを目的とする。そして、選択的インスリン感受性改善薬の創薬基盤を築くことを大きな目標として掲げる。

Outline of Final Research Achievements

In this study, the transcription factors FoxO1 and PPARα synergistically suppress hepatic glycogenesis and enhance insulin sensitivity. Luciferase assays using the G6pc gene showed that both transcription factors synergistically regulate glyconeogenesis in the presence of cAMP/Dex. Co-immunoprecipitation confirmed that both transcription factors do not bind directly to each other, suggesting that they bind individually to the same binding region. Experiments using hepatocyte-specific FoxO1/PPARα knockout mice showed that both transcription factors synergistically suppress glucose metabolism even under insulin resistance.

Academic Significance and Societal Importance of the Research Achievements

本研究は、糖代謝とインスリン感受性の制御におけるFoxO1とPPARαの相乗効果を初めて明らかにし、糖尿病治療の新たな分子標的を示唆する。この成果は、選択的インスリン抵抗性のメカニズム解明に寄与し、糖尿病治療法の開発における重要な一歩となる可能性がある。また、インスリン感受性の改善に向けた新たなアプローチを提供し、社会的に糖尿病患者のQOL向上に貢献することが期待される。

Report

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

    (7 results)

All 2024 2023

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results)

  • [Journal Article] Diabetes treatment by conversion of gut epithelial cells to insulin‐producing cells2024

    • Author(s)
      Accili Domenico、Talchai Shivatra C、Bouchi Ryotaro、Lee April Yun‐Kyoung、Du Wen、Kitamoto Takumi、McKimpson Wendy M、Belvedere Sandro、Lin Hua V
    • Journal Title

      Journal of Diabetes Investigation

      Volume: 9999 Issue: 7 Pages: 9999-9999

    • DOI

      10.1111/jdi.14175

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Unraveling the mysteries of hepatic insulin signaling: deconvoluting the nuclear targets of insulin2023

    • Author(s)
      Kitamoto Takumi、Accili Domenico
    • Journal Title

      Endocrine Journal

      Volume: 70 Issue: 9 Pages: 851-866

    • DOI

      10.1507/endocrj.EJ23-0150

    • ISSN
      0918-8959, 1348-4540
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Deconvolution of the Hepatic Nuclear Target of Insulin to Investigate Selective Insulin Sensitizer2023

    • Author(s)
      Takumi Kitamoto, and Domenico Accili
    • Journal Title

      Endocrine Journal

      Volume: in press

    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Deciphering the pathogenesis of aberrant hepatic gluconeogenesis and lipid synthesis orchestrated by FoxO1 and PPARα’2024

    • Author(s)
      Takumi Kitamoto
    • Organizer
      Seoul Symposium on Obesity and Diabetes 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 肝代謝遺伝子転写ロジックから紐解く選択的インスリン抵抗性の病態解明2023

    • Author(s)
      北本 匠、Diana Kuo、岡部篤史、金田篤志、Domenico Accili、横手幸太郎
    • Organizer
      第58回日本臨床分子医学会学術集会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] インスリン標的遺伝子におけるエンハンサー拡散異常を介した肝糖産生及び脂質合成異常の病態形成モデル2023

    • Author(s)
      Takumi Kitamoto, Diana Kuo, Atsushi Okabe, Atsushi Kaneda, Domenico Accili
    • Organizer
      第66回日本糖尿病学会年次学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Deciphering the pathogenesis of aberrant hepatic gluconeogenesis and lipid synthesis orchestrated by FoxO1 and PPARα2023

    • Author(s)
      Takumi Kitamoto, Hitoshi Watanabe, Yasutaka Miyachi, Makoto Miyabayashi, Rito Nakamura, Domenico Accili, Yoshiro Maezawa, Koutaro Yokote
    • Organizer
      27th Adiposcience Symposium
    • Related Report
      2023 Annual Research Report
    • Invited

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Published: 2022-04-19   Modified: 2025-01-30  

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