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Elucidation of disease mechanism of LMNA-mutant dilated cardiomyopathy focusing on chromatin remodeling and DNA damage response

Research Project

Project/Area Number 19K17515
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53020:Cardiology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ito Masamichi  東京大学, 医学部附属病院, 特任助教 (70794642)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords特発性拡張型心筋症 / iPS細胞 / LMNA変異 / 心不全 / 拡張型心筋症 / 病態解明 / ラミン変異 / 網羅的遺伝子発現解析 / エピゲノム解析 / ラミン / DNA損傷 / エピゲノム
Outline of Research at the Start

ラミン遺伝子(LMNA)変異は、進行性で薬物療法不応の拡張型心筋症(DCM)を引き起こすが、病態に根差した治療法や発症予防法は開発されていない。本研究ではLMNA変異を有する拡張型心筋症(DCM)患者から作成したiPS細胞由来心筋細胞と、相同点変異をノックインしたマウスの個体心臓を用い、①メカニカルストレス応答過程でのエピゲノム変化、②DNA損傷修復の変化を明らかにしながら解析を行う。それらの結果を統合することで「ラミン遺伝子(LMNA)の変異はなぜ心機能低下を引き起こすのか」を明らかにし、治療薬開発に資する分子基盤を同定する。

Outline of Final Research Achievements

In this study, in order to elucidate the pathogenesis of LMNA-mutated dilated cardiomyopathy, which has a poor prognosis and for which there is no cure, we generated iPS cells from the patients with LMNA mutation and differentiated them into cardiomyocytes. We found that LMNA mutant cardiomyocytes showed phenotypic abnormalities such as enhanced DNA damage response and abnormal electrical activity. Furthermore, comprehensive gene expression analysis of these cells showed decreased expression of muscle contractile fibers, suggesting impaired myocardial maturation. Furthermore, analysis of the epigenome, a regulatory system for gene expression, suggested that the expression of a group of target molecules of the transcription factor TEAD1 was reduced in LMNA-mutant myocardium. These findings may lead to understanding of the pathogenesis of DCM and the development of new therapies.

Academic Significance and Societal Importance of the Research Achievements

我々はこれまでの先行研究で、DNA損傷蓄積と心機能低下の因果関係を示してきた。今回用いた患者由来iPS心筋細胞を用い、心筋細胞のDNA損傷を軽減する化合物をスクリーニングすることで新たなDCMの治療候補化合物を同定できる可能性がある。
また、今回の結果はTEAD1の標的遺伝子群の発現低下が心筋細胞の成熟化障害に関与している可能性を示唆しており、TEAD1遺伝子導入によって心筋細胞の成熟化誘導が可能であれば、心不全進行過程で見られる心筋細胞の幼若化を抑えることで、新しい心不全治療法を提唱できる可能性がある。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019 Other

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

  • [Journal Article] Fibroblast-Cardiomyocyte Interaction in Pediatric Restrictive Cardiomyopathy2021

    • Author(s)
      Sato T, Ito M
    • Journal Title

      Circulation Journal

      Volume: 85 Issue: 5 Pages: 687-689

    • DOI

      10.1253/circj.CJ-21-0100

    • NAID

      130008028989

    • ISSN
      1346-9843, 1347-4820
    • Year and Date
      2021-04-23
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Titin Truncation Variant in Dilated Cardiomyopathy2021

    • Author(s)
      Ito M, Morita H
    • Journal Title

      International Heart Journal

      Volume: 62 Issue: 2 Pages: 221-223

    • DOI

      10.1536/ihj.21-053

    • NAID

      130008007423

    • ISSN
      1349-2365, 1349-3299
    • Year and Date
      2021-03-30
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Trends and Limitations in the Assessment of the Contractile Properties of Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes From Patients With Dilated Cardiomyopathy2020

    • Author(s)
      Ito M, Nomura S, Morita H, Komuro I.
    • Journal Title

      Front Cardiovasc Med.

      Volume: 7 Pages: 154-154

    • DOI

      10.3389/fcvm.2020.00154

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Construction of a Screening System for Therapeutic Candidate Compounds for Dilated Cardiomyopathy Using iPS cell-derived Cardiomyocytes2021

    • Author(s)
      Masamichi Ito Seitaro Nomura, Hiroyuki Morita, Issei Komuro
    • Organizer
      第85回 日本循環器学会学術集会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Exploring drug candidates for LMNA-mutant dilated cardiomyopathy2019

    • Author(s)
      Masamichi Ito
    • Organizer
      The 3rd JCS Council Forum on BCVR
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 東京大学医学部附属病院循環器内科>研究部門>疾患iPS研究グループ

    • URL

      https://cardiovasc.m.u-tokyo.ac.jp/study/ips/about

    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2022-01-27  

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