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Innate immune receptors recognizing RNA as regulating ILC2 function related with pathogensis of asthma

Research Project

Project/Area Number 22K16165
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53030:Respiratory medicine-related
Research InstitutionThe University of Tokyo

Principal Investigator

Takashi Ishii  東京大学, 保健・健康推進本部, 助教 (30803118)

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: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords気管支喘息 / 自然免疫 / RNA / ILC2 / House dust mite / 自然免疫系 / 2型自然リンパ球
Outline of Research at the Start

気管支喘息の病態解明は進んできているが、DNAやRNAのような核酸を認識する自然免疫に関わる受容体の観点からは未解明部分が多く存在する。
2型自然リンパ球 (ILC2)はアレルギー性炎症を起こす細胞として近年同定された後、肺や気道にも存在し気管支喘息病態に深く関与する知見が蓄積されている。一方で核酸認識受容体のILC2の発現、機能制御に関しては未解明となっている。
本研究ではRNA認識受容体であるMDA5、RIG-I-MAVSに焦点を当て、その発現の制御と機能、認識する核酸の種類、気管支喘息病態への関与を解明する事、創薬候補としての検証を目的とする。

Outline of Final Research Achievements

In this study, we focused on MDA5 and RIG-I (RLRs), cytoplasmic RNA recognition receptors, whose expression in ILC2 has been suggested by existing databases. Our aim was to elucidate their functions, recognized ligands, and involvement in the pathogenesis of bronchial asthma using a mouse model, as well as to assess their potential as drug candidates. The results indicated that MDA5 plays a protective role in a house dust mite-induced bronchial asthma model. Additionally, it was suggested that MDA5 contributes to the difference in response activity to ligands potentially derived from in vivo reactivity with IL-33 in ILC2. We will continue to investigate the protective mechanisms of RLRs in bronchial asthma and the roles of exogenous/endogenous nucleic acids in ILC2.

Academic Significance and Societal Importance of the Research Achievements

本研究では気管支喘息の病態における自然免疫受容体のMDA5やRIG-I(RLRs)に焦点を当て、気管支喘息病態への関与をマウス生体モデルを用いて解明する事、特に気管支喘息病態に重要な細胞集団の一つである2型自然リンパ球(ILC2)に着目してRLRsの役割を検証した。
結果としてはMDA5がマウスの発気管支喘息モデルにおいて保護的な役割を持つこと、またILC2においてもMDA5による制御が示唆された。今後特にMDA5の気管支喘息における保護的機序の解明やILC2における詳細な役割を検討する事で、気管支喘息の新規治療候補の土台の一つとなりうる意義がある。

Report

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

    (3 results)

All 2024 2022

All Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] RNA認識自然免疫受容体MDA5の気管支喘息病態への関与2024

    • Author(s)
      石井崇史, 鈴川真穂, 成田知也, 村上祐輔, 熊野恵城, 鹿毛秀宣
    • Organizer
      第73回日本アレルギー学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The RNA sensor MDA5 regulates inflammatory and profibrotic responses of Immune Cells In Bleomycin-induced Lung Fibrosis2024

    • Author(s)
      Takashi Ishii Masahumi Horie Hirokazu Urushiyama Yusuke Murakami Tomoya Narita Naomi Yamashita Keiki Kumano Akira Saito Hidenori Kage1
    • Organizer
      the 64th Annual Meeting of the Japanese Respiratory Society
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] RNA-recognizing immune sensor regulates bleomycin-induced activation of macrophages, lymphocytes, and neutrophils and subsequent lung fibrosis2022

    • Author(s)
      Takashi Ishii Yusuke MurakamiTomoya Narita Takahide Nagase Naomi Yamashita
    • Organizer
      APSR 2022 Congress in Seoul
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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

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