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Analysis of airway mucociliary transport via Toll-like receptors pathway

Research Project

Project/Area Number 19K08600
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 InstitutionHamamatsu University School of Medicine

Principal Investigator

Fujisawa Tomoyuki  浜松医科大学, 医学部, 助教 (20402357)

Co-Investigator(Kenkyū-buntansha) 鈴木 哲朗  浜松医科大学, 医学部, 教授 (00250184)
須田 隆文  浜松医科大学, 医学部, 教授 (30291397)
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: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords線毛輸送系 / ウイルス感染 / 線毛運動 / Toll-like receptor / 生体防御 / 長時間作用性抗コリン薬 / ウイルス性気道感染 / 線毛輸送 / インフルエンザAウイルス / 粘液線毛輸送系 / 線毛機能 / TLR3 / インフルエンザウイルス / polyI:C / 線毛輸送能 / 線毛活性 / Toll様受容体 / 慢性気道疾患
Outline of Research at the Start

気管支拡張症,COPD,気管支喘息などの様々な慢性気道疾患において,粘膜線毛輸送系の障害が報告されており,これらの疾患の病態,とくに進展・増悪に重要な役割を果たしている.申請者は,気道上皮において,自然免疫応答で重要な役割を担うTLR (Toll-like receptor) のリガンドが粘液線毛輸送系に及ぼす影響を検討し,TLR3リガンドが遺伝子発現を介さずに粘液線毛輸送系を促進することを見出した.本研究では,TLR3を介した遺伝子発現に依存しない粘液線毛輸送系の促進機序を解明し,粘液線毛輸送系をターゲットにした慢性気道疾患の画期的な新規創薬に向けての基盤を築く.

Outline of Final Research Achievements

Mucociliary clearance is an airway defense mechanism that removes pathogens from the respiratory tract. However, the impact of innate immune response on mucociliary clearance remains unclear. To elucidate the mechanism of TLR-mediated promotion of mucociliary clearance, we focused on the TLR3 pathway and evaluated the effects of polyI:C and influenza A virus (IAV) infection on the promotion of ciliary activity and cilia-driven flow using murine tracheal tissue culture model. We found that polyI:C and IAV infection readily increased ciliary activity and cilia-driven flow via TLR3 activation. Mechanically, extracellular ATP release in response to TLR3 activation promotes ciliary activity through autocrine ATP-P2R loop.
We also analyzed the effects of long-acting muscarinic antagonists (LAMAs), therapeutics for asthma and COPD, on ciliary activity and cilia-driven flow. We found that the LAMAs, tiotropium and glycopyrronium, exerted a direct effect to enhance airway ciliary function.

Academic Significance and Societal Importance of the Research Achievements

今回の研究により,IAV感染において、気道上皮は線毛輸送系を促進して、気道の生体防御に寄与することが明らかとなった.この結果は,IAVだけでなくRNAウイルス全般(コロナウイルス,ライノウイルスなど),ひいては現在猛威を振うCOVID-19に対する気道の生体防御機構の解明に応用できる.さらに,メカニズムを詳細に解明することにより,線毛輸送系の促進をターゲットにした新たな創薬研究に発展させることが可能となる.
また,既存の治療薬であるLAMAの新規作用として,線毛機能促進作用を明らかにしたことは,慢性気道疾患における生体防御の観点から臨床的な意義は大きい.

Report

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

    (6 results)

All 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Influenza A virus enhances ciliary activity and mucociliary clearance via TLR3 in airway epithelium.2020

    • Author(s)
      Kamiya Y, Fujisawa T, Katsumata M, Yasui H, Suzuki Y, Karayama M, Hozumi H, Furuhashi K, Enomoto N, Nakamura Y, Inui N, Setou M, Ito M, Suzuki T, Ikegami K, Suda T.
    • Journal Title

      Respir Res.

      Volume: 21 Issue: 1 Pages: 282-282

    • DOI

      10.1186/s12931-020-01555-1

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Long Acting Muscarinic Antagonists Promote Ciliary Function in Airway Epithelium2021

    • Author(s)
      Katsumata M, Fujisawa T, Kamiya Y, Inoue Y, Hozumi H, Suzuki Y, Karayama M, Furuhashi K, Enomoto N, Nakamura Y, Inui N, Setou M, Ikegami K, Suda T
    • Organizer
      American Thoracic Society 2021 International Conference Virtual
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 長時間作用型抗コリン薬による線毛運動促進作用の解析.2021

    • Author(s)
      勝又峰生,藤澤朋幸,神谷陽輔,穗積宏尚,鈴木勇三,柄山正人,古橋一樹,榎本紀之,中村祐太郎,乾直輝,瀬藤光利,池上浩司,須田隆文
    • Organizer
      第61回日本呼吸器学会学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 長時間作用性抗コリン薬は気道上皮の線毛機能を促進する.2021

    • Author(s)
      勝又峰生,藤澤朋幸,神谷陽輔,穗積宏尚,鈴木勇三,柄山正人,古橋一樹,榎本紀之,中村祐太郎,乾直輝,瀬藤光利,池上浩司,須田隆文
    • Organizer
      第70回日本アレルギー学会学術大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] PolyI:C and Influenza A Virus Promote Mucociliary Clearance via TLR3 Pathway.2020

    • Author(s)
      Kamiya Y, Fujisawa T, Yasui H, Hozumi H, Karayama M, Suzuki Y, Furuhashi K, Enomoto N, Nakamura Y, Inui N, Setou M, Suzuki T, Ikegami K, Suda T
    • Organizer
      American Thoracic Society 2020 International Conference
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] TLR3リガンドによる粘液線毛輸送系の促進作用とその機序の解析2020

    • Author(s)
      神谷陽輔, 藤澤朋幸, 安井秀樹, 穗積宏尚, 柄山正人, 鈴木勇三, 古橋一樹, 榎本紀之, 中村祐太郎, 乾直輝, 瀬藤光利, 鈴木哲朗, 池上浩司, 須田隆文
    • Organizer
      第60回日本呼吸器学会学術講演会
    • Related Report
      2020 Research-status Report

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

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