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Development of novel heart failure treatment targeting NADPH oxidase component p22phox

Research Project

Project/Area Number 22K16080
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53020:Cardiology-related
Research InstitutionNara Medical University

Principal Investigator

Nakada Yasuki  奈良県立医科大学, 医学部, 助教 (70812379)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords心不全 / NADPHオキシダーゼ / p22phox / 酸化ストレス / SERCA2a / 活性酸素
Outline of Research at the Start

心不全治療において様々な治療薬が出てきたものの,いまだに予後の悪い疾患であり,分子メカニズムに立脚したより有用な治療薬の開発が望まれている.申請者らは心筋細胞での活性酸素(ROS)の産生に関わるNADPHオキシダーゼ(NOX)の働きが,心不全の発症あるいは進展に寄与することを示してきた.今回,NOX構成因子である「p22phox」が,NOXの安定化だけでなく,心筋収縮を担う心筋筋小胞体Ca2+-ATPase(SERCA2a)の発現維持に関わることを示し,新たな心不全治療への展開を探る.

Outline of Final Research Achievements

We researched p22phox, which forms a heterodimer with NADPH oxidase (NOX), the main source of reactive oxygen species. We found that the expression of p22phox was significantly increased in heart samples from human heart failure patients compared to healthy subjects. In addition, cardiomyocyte-specific p22phox knockout mice showed reduced expression of myocardial sarcoplasmic/endoplasmic reticulum Ca2+-ATPase (SERCA2a), which plays a central role in cardiac contraction and relaxation, suggesting that p22phox is involved not only in stabilizing NOX but also in maintaining the expression of SERCA2a.

Academic Significance and Societal Importance of the Research Achievements

高齢化社会を迎えた日本において,心血管疾患による死亡は癌に次いで2番目に多く,そのなかでも心不全による死亡の割合が最も多くなっている.心不全患者に対する治療薬が様々開発されているものの,未だに予後不良な疾患のままであり,従来とは異なる視点から分子メカニズムを検討する必要がある.今回の研究では心不全におけるNADPHオキシダーゼファミリーの新たな機序の解明するものであり,新規の治療薬を開発に寄与する可能性がある.

Report

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

    (2 results)

All 2024 2022

All Presentation (2 results)

  • [Presentation] p22phox is a critical factor for the prevention of oxidation and stabilization of SERCA2a in the heart2024

    • Author(s)
      Allen Titus, Yasuki Nakada, Junichi Sadoshima
    • Organizer
      Basic Cardiovascular Sciences Scientific Sessions 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] 圧負荷におけるSERCA2aを介したp22phoxの心保護的な役割2022

    • Author(s)
      中田康紀
    • Organizer
      第26回日本心不全学会学術集会
    • Related Report
      2022 Research-status Report

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

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