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Role of histone methylation modifications in the pathogenesis of nonalcoholic fatty liver disease.

Research Project

Project/Area Number 21K15989
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Nakatsuka Takuma  東京大学, 医学部附属病院, 助教 (50772042)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords非アルコール性脂肪性肝疾患 / 脂肪肝 / エピゲノム異常 / ヒストン修飾 / ヒストンメチル化 / G9a / NAFLD / エピジェネティクス
Outline of Research at the Start

非アルコール性脂肪性肝疾患(NAFLD)は極めて有病率の高い生活習慣病の1つであるが、有効な薬物治療がなく新規創薬につながる病態解明が望まれる。
エネルギー代謝を担う遺伝子発現制御にはエピジェネティック機構が関与するが、ヒストンH3の9番目リシン(H3K9)のメチル化修飾は脂質代謝に関連した遺伝子発現制御に寄与することが知られる。我々はH3K9メチル化酵素G9aに着目し、マウスモデルを用いた検討の結果、G9aが脂肪肝形成に深く関与する可能性を見出した。本研究はG9a阻害によるNAFLD治療の可能性を追求し、NAFLDに対するエピゲノム医薬創出の橋渡しとなる成果を得ることを目的とする。

Outline of Final Research Achievements

Numerous epigenomic modifications have been established to contribute to the development of hepatic steatosis. Our study employed mice harboring a liver-specific knock out (KO) of the histone methyltransferase G9a, and our findings indicate a decrease in the formation of fatty liver in G9a-KO hepatic tissues upon exposure to a high-fat diet (HFD). Furthermore, these G9a-KO mice exhibited enhanced weight gain and improved insulin sensitivity. Through an comprehensive gene expression analysis of mouse liver samples, we observed alterations in a subset of genes regulated by transcription factors associated with lipid metabolism, PPAR, LXR, and RXR, within the G9a-KO livers during HFD intake. Notably, the expression of Cd36, a pivotal mediator of fatty acid uptake into hepatocytes, was found to be reduced in G9a-KO livers, thereby suggesting its potential involvement in the amelioration of hepatic steatosis.

Academic Significance and Societal Importance of the Research Achievements

非アルコール性脂肪性肝疾患は世界中で増加しており健康保健上の大きな問題となっているが、未だ有効な薬物療法が存在しない。生活習慣病を含む様々な病態にエピゲノム異常が関与することが知られているが、本研究の成果によりエピゲノム修飾因子のひとつであるヒストンメチル化酵素G9aが脂肪肝形成やインスリン抵抗性に重要な役割を担うことが明らかとなった。G9a阻害剤により脂肪肝の病態進展を抑制できる可能性があり、脂肪肝に対する新規創薬のたーでっととなることが期待される。

Report

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

    (4 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results)

  • [Journal Article] Development and prognosis of hepatocellular carcinoma in patients with diabetes2023

    • Author(s)
      Nakatsuka Takuma、Tateishi Ryosuke
    • Journal Title

      Clinical and Molecular Hepatology

      Volume: 29 Issue: 1 Pages: 51-64

    • DOI

      10.3350/cmh.2022.0095

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Agile scores are a good predictor of liver-related events in patients with NAFLD2023

    • Author(s)
      Nakatsuka Takuma、Tateishi Ryosuke、Sato Masaya、Fujishiro Mitsuhiro、Koike Kazuhiko
    • Journal Title

      Journal of Hepatology

      Volume: - Issue: 3 Pages: e126-e127

    • DOI

      10.1016/j.jhep.2023.02.029

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Risk stratification of hepatocellular carcinoma after hepatitis C virus eradication in patients with compensated advanced chronic liver disease in Japan2022

    • Author(s)
      Nakatsuka Takuma、Tateishi Ryosuke、Nakagomi Ryo、Minami Tatsuya、Koike Kazuhiko
    • Journal Title

      Journal of Hepatology

      Volume: 3 Issue: 2 Pages: 138-138

    • DOI

      10.1016/j.jhep.2022.03.002

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Changing clinical management of NAFLD in Asia2021

    • Author(s)
      Nakatsuka Takuma、Tateishi Ryosuke、Koike Kazuhiko
    • Journal Title

      Liver International

      Volume: 8 Issue: 9 Pages: 15046-15046

    • DOI

      10.1111/liv.15046

    • Related Report
      2021 Research-status Report
    • Peer Reviewed

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Published: 2021-04-28   Modified: 2024-01-30  

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