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Study on mechanisms of exacerbation of tissue fibrogenesis by NOX4-derived reactive oxygen species

Research Project

Project/Area Number 19K07326
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48030:Pharmacology-related
Research InstitutionKyoto Prefectural University of Medicine

Principal Investigator

Katsuyama Masato  京都府立医科大学, 医学(系)研究科(研究院), 准教授 (60315934)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords活性酸素種 / NADPHオキシダーゼ / 組織線維化 / 活性酸素
Outline of Research at the Start

NOX4/NADPHオキシダーゼが産生する活性酸素種(ROS)は組織線維化の増悪因子のひとつであるが、その産生機構と下流のシグナルについては未解明の点が多い。そこで本研究では、
A)組織線維化に関与するROSの供給源のひとつと考えられる「NOX4のN末端スプライスバリアントNOX4A」のROS産生亢進機構の解明
B)TGF-β共役受容体endoglinの安定化を介して線維化シグナルを増幅すると考えられる「NOX4によるatypical protein kinase C(aPKC)の活性抑制」機構の解明
C)NOX4由来ROSが線維化増悪転写因子FOXM1を活性化する可能性の検証
に取り組み、組織線維化増悪サイクルを断ち切る新たな治療法の開発への応用を目指す。

Outline of Final Research Achievements

It is well known that NOX4/NADPH oxidase is induced at mRNA levels by TGF-β and is involved in fibrogenesis. In human lung fibroblasts transfected with siRNAs against NOX4, levels of endoglin, a co-receptor of TGF-β receptor, were decreased at protein levels compared with those in control siRNA-transfected cells. Smad binding element-dependent transcriptional activation by TGF-β was suppressed by RNA interference against NOX4. These results suggest that feedforward regulations to exacerbate tissue fibrogenesis exist between NOX4 and endoglin of which functional expression seems to be maintained by NOX4-derived reactive oxygen species.

Academic Significance and Societal Importance of the Research Achievements

組織線維化は不可逆的な変化であり、根治可能な薬物療法は現在のところ存在しない。NOX4は活性酸素種(ROS)を産生するNADPHオキシダーゼの触媒サブユニットの一分子種であり、NOX4が産生するROSは組織線維化に重要な役割を果たすが、その分子機構は未解明の点が多い。本研究では「TGF-β→NOX4の発現誘導→エンドグリンの機能的発現維持→TGF-βシグナルの増強」という線維化増悪サイクルの存在が示唆された。新たな抗線維化薬の開発のための基礎的知見となるものと考えている。

Report

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

    (1 results)

All 2022

All Presentation (1 results)

  • [Presentation] NOX研究の歴史と阻害薬開発の動向2022

    • Author(s)
      勝山真人
    • Organizer
      第95回 日本薬理学会年会
    • Related Report
      2021 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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