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Development of novel treatment for fulminant myocarditis focusing on immune checkpoint molecules

Research Project

Project/Area Number 19K23843
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0803:Pathology, infection/immunology, and related fields
Research InstitutionNagoya University

Principal Investigator

Hiraiwa Hiroaki  名古屋大学, 医学部附属病院 循環器内科, 病院助教 (10844904)

Project Period (FY) 2019-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords劇症型心筋炎 / リンパ球性心筋炎 / 免疫チェックポイント分子 / PD-1, PD-L1 / 活性化T細胞 / 予後 / PD-1 PD-L1 / PD-1 reporter systemの構築
Outline of Research at the Start

心筋炎は未だ救命率の低い致死的疾患であり予防・治療法の確立は社会的ニーズが高い。一方、その臨床像は幅広く、発症や劇症化に至るメカニズムについて詳細は明らかでないため、薬物治療も確立されていないのが現状である。本研究は免疫チェックポイント分子であるPD-1(Programmed cell death 1)およびPD-L1(Programmed cell death-ligand 1)の発現が心筋炎の発症や劇症化進展に関与しているかどうかを検証することで、心筋炎に対する免疫応答を介した特異的な治療法の開発へ繋げることを目指した研究である。

Outline of Final Research Achievements

This study investigated the relationship between T cell markers and PD-L1 expression in myocardial tissue and the prognosis of patients with fulminant lymphocytic myocarditis (FM). We analyzed 16 FM patients and found that the number of CD8+ T cells and CD8+/CD4+ T cell ratio were significantly higher in the group with cardiac events (composite of cardiac death and left ventricular assist device implantation). Additionally, the number of FoxP3+ T cells was higher in the cardiac event group, and PD-L1 expression in myocardial cells was also higher in the same group. Kaplan-Meier survival analysis revealed that high CD8+ T cell count or high PD-L1 expression in the myocardium could be poor prognostic factors in FM. Combining the expression of CD8+ T cells and PD-L1 could potentially help stratify the risk of cardiac events in FM. This study provides new insights into the mechanism and prognosis of fatal FM, which could aid in the development of new treatment strategies in the future.

Academic Significance and Societal Importance of the Research Achievements

リンパ球性劇症型心筋炎(FM)は致死的な疾患であり、劇症化メカニズムや治療開発に対する社会的ニーズが非常に高い。本研究では、T細胞プロファイルおよび免疫チェックポイント分子であるPD-1およびPD-L1の発現に注目した。結果、FM患者のうち、CD8陽性T細胞数およびCD8陽性/CD4陽性T細胞比が高い群で予後が悪いこと、PD-L1高発現群やCD8高値-PD-L1高発現群で生存率が低く、CD8陽性T細胞とPD-L1の発現を組み合わせることで、予後層別化が可能であることを示した。本研究の結果は、FM患者の予後を予測するための新たな知見を提供し、将来的に新たな治療戦略の開発に役立つことが期待される。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (2 results)

All 2020

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

  • [Journal Article] Fulminant myocarditis with myositis of ocular and respiratory muscles2020

    • Author(s)
      Hiraiwa H, Furusawa K, Kazama S, Kimura Y, Shibata N, Arao Y, Oishi H, Kato H, Kuwayama T, Yamaguchi S, Kondo T, Sawamura A, Morimoto R, Okumura T, Murohara T.
    • Journal Title

      Nagoya Journal of Medical Science

      Volume: 82 Issue: 3 Pages: 585-593

    • DOI

      10.18999/nagjms.82.3.585

    • NAID

      120006881559

    • ISSN
      2186-3326
    • URL

      https://nagoya.repo.nii.ac.jp/records/30428

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fulminant Myocarditis with Myositis of Ocular and Respiratory Muscles: A Case Report2020

    • Author(s)
      Hiroaki Hiraiwa, Kenji Furusawa, Shingo Kazama, Yuki Kimura, Naoki Shibata, Yoshihito Arao, Hideo Oishi, Hiroo Kato, Tasuku Kuwayama, Shogo Yamaguchi, Toru Kondo, Akinori Sawamura, Ryota Morimoto, Takahiro Okumura, Toyoaki Murohara
    • Journal Title

      Nagoya Journal of Medical Science

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed

URL: 

Published: 2019-09-03   Modified: 2024-01-30  

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