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Elucidation of the Mechanism of Mitochondrial DNA Release Mediated by Iron Metabolism in Idiopathic Pulmonary Fibrosis

Research Project

Project/Area Number 21K08214
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53030:Respiratory medicine-related
Research InstitutionNihon University

Principal Investigator

MIZUMURA Kenji  日本大学, 医学部, 兼任講師 (20761688)

Co-Investigator(Kenkyū-buntansha) 権 寧博  日本大学, 医学部, 教授 (80339316)
丸岡 秀一郎  日本大学, 医学部, 准教授 (80599358)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords特発性肺線維症 / 鉄代謝 / ミトコンドリアDNA / タバコ煙 / 線維化
Outline of Research at the Start

特発性肺線維症は肺の線維化を特徴とし、予後不良であるが、治療法は限られている。加齢や喫煙が危険因子であり、肺胞上皮の損傷と、それに続く修復過程における上皮細胞が間葉系細胞へと分化するプロセス(上皮間葉転換) が病態として提唱されているが不明な点が多い。本研究では、進行する肺の線維化を制御する情報伝達物質としてミトコンドリアDNA(mtDNA)に着目し、鉄代謝によるmtDNAの細胞外放出メカニズムと線維化について解明し、臨床応用への研究基盤を確立することを目的としている。

Outline of Final Research Achievements

In this study, we focused on mtDNA as a second messenger in the control of pulmonary fibrosis, aiming to elucidate the mechanism by which iron metabolism mediates the extracellular release of mtDNA and its implications for fibrosis. We demonstrated that the iron metabolism pathway regulates the release of mtDNA from alveolar epithelial cells induced by cigarette smoke. The extracellular mtDNA acts on alveolar epithelial cells, enhancing the production of critical inflammatory cytokines such as IL-6 and IL-8, which are important in the pathophysiology of pulmonary fibrosis. In vivo, our findings suggest that the iron metabolism pathway regulates the development of pulmonary fibrosis. These results clarify the mechanism by which the iron metabolism pathway regulates pulmonary fibrosis through the release of mtDNA induced by cigarette smoke.

Academic Significance and Societal Importance of the Research Achievements

特発性肺線維症は肺の線維化を特徴とし, 予後不良であるが, 治療法は限られている. 本研究は, 肺線維化の新たなメカニズムとして鉄代謝とmtDNAに着目し, 診断と治療応用への研究基盤を確立することを目的とした. 本研究により, タバコ煙によるmtDNA放出を介した肺の線維化を, 鉄代謝経路が制御するメカニズムが明らかとなった. 肺線維症の病態形成において, mtDNAの細胞外放出が肺の線維化に関わり, 鉄代謝がその病態生理に中心的な役割を果たしている考えられ, 鉄代謝経路の制御は, 新たな特発性肺線維症の治療薬やバイオマーカーの開発につながる可能性がある.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

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

  • [Journal Article] Iron-Dependent Mitochondrial Dysfunction Contributes to the Pathogenesis of Pulmonary Fibrosis2022

    • Author(s)
      Takahashi Mai、Mizumura Kenji、Gon Yasuhiro、Shimizu Tetsuo、Kozu Yutaka、Shikano Sotaro、Iida Yuko、Hikichi Mari、Okamoto Shinichi、Tsuya Kota、Fukuda Asami、Yamada Shiho、Soda Kaori、Hashimoto Shu、Maruoka Shuichiro
    • Journal Title

      Frontiers in Pharmacology

      Volume: 12 Pages: 643980-643980

    • DOI

      10.3389/fphar.2021.643980

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] タバコ煙曝露による気道上皮細胞からのミトコンドリアDNA放出機構の解明2023

    • Author(s)
      水村賢司、神津悠、鹿野壮太郎、佐久間麻衣、引地麻梨、藤原大士、黒澤雄介、曽田香織、丸岡秀一郎、權寧博
    • Organizer
      第63回日本呼吸器学会学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The mechanism of cigarette smoke-induced mitochondrial DNA release in pulmonary epithelial cell2021

    • Author(s)
      Kenji Mizumura, Mai Takahashi, Mari Hikichi, Shiho Yamada, Asami Fukuda, Yusuke Kurosawa, Kaori Soda, Shuichiro Maruoka and Yasuhiro Gon
    • Organizer
      THE 25th Congress of the Asian Pacific Society of Respirology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Iron-dependent mitochondrial dysfunction contributes to the pathogenesis of pulmonary fibrosis2021

    • Author(s)
      Kenji Mizumura, Mai Takahashi, Shuichiro Maruoka, Tetsuo Shimizu, Yutaka Kozu, Sotaro Shikano, Yuko Iida, Mari Hikichi, Shinichi Okamoto, Kota Tsuya, Asami Fukuda, Shiho Yamada, Kaori Soda, Shu Hashimoto, and Yasuhiro Gon
    • Organizer
      THE 25th Congress of the Asian Pacific Society of Respirology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mitochondria in COPD2021

    • Author(s)
      Kenji Mizumura,Augustine. M.K. Choi,Shu Hashimoto,Yasuhiro Gon
    • Organizer
      THE 25th Congress of the Asian Pacific Society of Respirology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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