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Analysis of bacterial strategies that counteract host defense cross-talk

Research Project

Project/Area Number 21H02728
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionTokyo Medical and Dental University

Principal Investigator

Ashida Hiroshi  東京医科歯科大学, 大学院医歯学総合研究科, 准教授 (10535115)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2022: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2021: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords腸管病原菌 / エフェクター / 細胞死 / 炎症 / 赤痢菌 / caspase-8 / apoptosis / necroptosis / pyroptosis / 病原細菌 / 自然免疫応答
Outline of Research at the Start

生体は感染早期に病原細菌の感染を感知し、自然免疫応答を誘導することで感染を効果的に阻止する。これに対し、多くの腸管病原菌はIII型分泌装置を通じて複数のエフェクターを宿主細胞内に分泌し、自然免疫応答を抑制する。興味深いことに、宿主側も病原細菌の自然免疫抑制を感知し、別の生体防御機構をバックアップとして発動させる「生体防御クロストーク」を有している。しかし、生体防御クロストークに関する知見は乏しく、それに対抗する病原細菌の生存戦略も未解明である。
そこで本研究では、腸管病原菌感染における宿主生体防御クロストーク発動機構とそれに対抗する病原細菌の感染戦略を解明する。

Outline of Final Research Achievements

In this study, we have identified bacterial strategy that counteracts host defense crosstalk. EPEC delivers effector to prevent necroptosis, while it becomes a cue to trigger pyroptosis. To counteract this, EPEC delivers another effector F and prevents pyroptosis. In addition, Shigella effector O downregulates host inflammatory responses, while induces apoptosis. To counteract effector O-triggered apoptosis, Shigella delivers OspC1 effector and prevents apoptosis. In conclusion, we found that enteric bacterial pathogens prevent host defense crosstalk through spatiotemporal regulation by effectors.

Academic Significance and Societal Importance of the Research Achievements

本研究では、腸管病原菌感染における生体防御クロストーク発動機構とそれに対する腸管病原菌の感染戦略を解明した。本研究により得られた知見は未だ未解明な点が多い腸管病原菌の感染機構解明に寄与した。また、腸管病原菌による新たな感染戦略を標的とする創薬・ワクチン開発へとつながることが期待される。

Report

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

    (12 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 7 results,  Open Access: 5 results) Presentation (3 results) (of which Invited: 3 results) Book (2 results)

  • [Journal Article] D-amino Acids Ameliorate Experimental Colitis and Cholangitis by Inhibiting Growth of Proteobacteria: Potential Therapeutic Role in Inflammatory Bowel Disease2023

    • Author(s)
      Umeda Satoko、 Sujino Tomohisa、、、Shiomi Daisuke、Ashida Hiroshi、Kanai Takanori
    • Journal Title

      Cellular and Molecular Gastroenterology and Hepatology

      Volume: 16 Issue: 6 Pages: 1011-1031

    • DOI

      10.1016/j.jcmgh.2023.08.002

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The gut microbiota-induced kynurenic acid recruits GPR35-positive macrophages to promote experimental encephalitis2023

    • Author(s)
      Miyamoto Kentaro、Sujino Tomohisa、...、Kanai Takanori
    • Journal Title

      Cell Reports

      Volume: 42 Issue: 8 Pages: 113005-113005

    • DOI

      10.1016/j.celrep.2023.113005

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] <i>Fusobacterium nucleatum</i> infection activates the noncanonical inflammasome and exacerbates inflammatory response in DSS‐induced colitis2023

    • Author(s)
      Boonyaleka Kotchakorn、Okano Tokuju、Iida Tamako、Leewananthawet Anongwee、Sasai Miwa、Yamamoto Masahiro、Ashida Hiroshi、Suzuki Toshihiko
    • Journal Title

      European Journal of Immunology

      Volume: 53 Issue: 11 Pages: 1-13

    • DOI

      10.1002/eji.202350455

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Inflammasome-triggered IL-18 controls skin inflammation in the progression of Buruli ulcer2023

    • Author(s)
      Suzuki Toshihiko、Boonyaleka Kotchakorn、Okano Tokuju、Iida Tamako、Yoshida Mitsunori、Fukano Hanako、Hoshino Yoshihiko、Iwakura Yoichiro、Ablordey Anthony S.、Ashida Hiroshi
    • Journal Title

      PLOS Pathogens

      Volume: 19 Issue: 11 Pages: e1011747-e1011747

    • DOI

      10.1371/journal.ppat.1011747

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of low oxygen concentration on activation of inflammation by Helicobacter pylori2021

    • Author(s)
      Adiza Abass, Tokuju Okano, Kotchakorn Boonyaleka, RyoKinoshita-Daitoku, Shoji Yamaoka, Hiroshi Ashida, Toshihiko Suzuki
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 560 Pages: 179-185

    • DOI

      10.1016/j.bbrc.2021.04.123

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A bacterial small RNA regulates the adaptation of Helicobacter pylori to the host environment2021

    • Author(s)
      Kinoshita-Daitoku, R., Kiga, K., Miyakoshi, M. et al.
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 2085-2085

    • DOI

      10.1038/s41467-021-22317-7

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Pancreatic glycoprotein 2 is a first line of defense for mucosal protection in intestinal inflammation2021

    • Author(s)
      Kurashima Yosuke、Kigoshi Takaaki、Murasaki Sayuri、Arai Fujimi、Shimada Kaoru、Seki Natsumi、Kim Yun-Gi、Hase Koji、Ohno Hiroshi、Kawano Kazuya、Ashida Hiroshi、Suzuki Toshihiko、Morimoto Masako、Saito Yukari、Sasou Ai、Goda Yuki、Yuki Yoshikazu、Inagaki Yutaka、Iijima Hideki、Suda Wataru、Hattori Masahira
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 1067-1067

    • DOI

      10.1038/s41467-021-21277-2

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 赤痢菌による宿主細胞死制御機構の解明2023

    • Author(s)
      芦田 浩、鈴木 敏彦
    • Organizer
      第166回日本獣医学会学術集会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 腸管病原菌による宿主細胞死制御機構の解明2023

    • Author(s)
      芦田 浩、鈴木 敏彦
    • Organizer
      第34回日本生体防御学会学術総会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 腸管病原菌による宿主細胞死制御機構の解明2022

    • Author(s)
      芦田 浩、鈴木 敏彦
    • Organizer
      第34回微生物シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Book] 月刊「細胞」,54(10)2022

    • Author(s)
      芦田 浩、鈴木 敏彦
    • Total Pages
      4
    • Publisher
      ニューサイエンス社
    • Related Report
      2022 Annual Research Report
  • [Book] 炎症と免疫2022

    • Author(s)
      岩澤 茉莉絵、芦田 浩、鈴木 敏彦、笹川 千尋
    • Total Pages
      5
    • Publisher
      先端医学社
    • Related Report
      2021 Annual Research Report

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

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