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Analysis of autoimmune dysregulation caused by changes in intestinal microbiota due to environmental factors

Research Project

Project/Area Number 20K07428
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49030:Experimental pathology-related
Research InstitutionJuntendo University

Principal Investigator

Hayakawa Kunihiro  順天堂大学, 大学院医学研究科, 准教授 (00573007)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords自己免疫疾患 / 腸内細菌叢 / 環境要因 / 免疫寛容
Outline of Research at the Start

通常、私たちは様々な環境要因に曝露されて生活している。このような環境要因はアレルギー疾患のみならず、自己免疫疾患の発症や悪化に寄与することが示唆されている。本研究では、代表的な自己免疫疾患である全身性エリテマトーデスを対象とし、環境要因によって腸内細菌叢の変化が起こり、その結果として、通常は反応しない自己成分を認識する、自己寛容破綻起こす機序の解明を行う。このような免疫システムのかく乱機序の一端を解明し、外来成分や内因性分に対する過剰応答を抑制するなど応用することで、様々な免疫疾患への新たな予防・治療戦略の提唱が期待できる。

Outline of Final Research Achievements

This study investigated whether chronic activation of TLR7 signaling alters the intestinal environment and contributes to subsequent autoimmune responses. Changes in the intestinal microbiota were observed one week after the initiation of TLR7 agonist stimulation, peaking at two weeks. A metagenomic analysis was attempted, but the changes were dependent on the individual prior to stimulation, thus the details could not be elucidated specific bacterial species changes. Furthermore, we attempted to reduce the intestinal microbiota by administering antibiotics and protect the intestinal epithelial barrier, and examined the impact on autoantibody production. However, no changes were observed in autoantibody production. These results suggest that TLR7 signal activation alters the intestinal microbiota, but it is not yet clear whether this change is directly associated with autoimmune diseases.

Academic Significance and Societal Importance of the Research Achievements

本研究では、慢性的なTLR7シグナル活性化が腸内細菌叢を変化させることを明らかにし、ウイルス感染症等が腸内細菌叢を変化させることが示唆された。さらに、その変化が自己免疫疾患と関連しているかを検証したが、その関連性は明確ではなかった。しかし、この点を解明することは、自己免疫疾患の発症メカニズムを理解し、治療法を開発する上で重要である。また、腸内細菌叢の変化は個体によって異なるため、腸内細菌叢をターゲットとした治療戦略は、個々の患者に合わせた個別化医療として検討する必要がある。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (12 results)

All 2024 2022 2021 2020 Other

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (5 results) Remarks (2 results)

  • [Journal Article] Exposure of female NZBWF1 mice to imiquimod-induced lupus nephritis at an early age via a unique mechanism that differed from spontaneous onset2022

    • Author(s)
      Hayakawa Kunihiro、Fujishiro Maki、Yoshida Yuko、Kataoka Yuko、Sakuma Shota、Nishi Takuya、Ikeda Keigo、Morimoto Shinji、Takamori Kenji、Sekigawa Iwao
    • Journal Title

      Clinical and Experimental Immunology

      Volume: uxac012 Issue: 1 Pages: 33-46

    • DOI

      10.1093/cei/uxac012

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Type 1 interferon suppresses expression and glucocorticoid induction of glucocorticoid-induced leucine zipper (GILZ)2022

    • Author(s)
      Dankers Wendy、Northcott Melissa、Bennett Taylah、D’Cruz Akshay、Sherlock Rochelle、Gearing Linden J.、Hertzog Paul、Russ Brendan、Miceli Iolanda、Scheer Sebastian、Fujishiro Maki、Hayakawa Kunihiro、Ikeda Keigo、Morand Eric F.、Jones Sarah A.
    • Journal Title

      Frontiers in Immunology

      Volume: 13 Pages: 1034880-1034880

    • DOI

      10.3389/fimmu.2022.1034880

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Metformin repositioning in rheumatoid arthritis2021

    • Author(s)
      Matsuoka Yuki、 Morimoto Shinji、 Fujishiro Maki、 Hayakawa Kunihiro、 Kataoka Yuko、 Suzuki Satoshi、 Ikeda Keigo、 Takamori Kenji、 Yamaji Ken、 Tamura Naoto
    • Journal Title

      Clinical and Experimental Rheumatology

      Volume: 39 Pages: 763-768

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Social defeat stress exacerbates atopic dermatitis through downregulation of DNA methyltransferase 1 and upregulation of C?C motif chemokine receptor 7 in skin dendritic cells2020

    • Author(s)
      Yoshida Yuko、Hayakawa Kunihiro、Fujishiro Maki、Ikeda Keigo、Tsushima Hiroshi、Hirai Takuya、Kawasaki Mikiko、Tominaga Mitsutoshi、Suga Yasushi、Takamori Kenji、Watanabe Yoshifumi、Sekigawa Iwao、Morimoto Shinji
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 529 Issue: 4 Pages: 1073-1079

    • DOI

      10.1016/j.bbrc.2020.06.157

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Metformin repositioning in rheumatoid arthritis2020

    • Author(s)
      Matsuoka, Yuki; Morimoto, Shinji; Fujishiro, Maki; Hayakawa, Kunihiro; Kataoka, Yuko; Suzuki, Satoshi; Ikeda, Keigo; Takamori, Kenji; Yamaji, Ken; Tamura, Naoto
    • Journal Title

      Clinical and experimental rheumatology

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Analysis of the relationship between changes in the gut microbiota and the production of autoantibodies2024

    • Author(s)
      Kunihiro Hayakawa, Maki Fujishiro
    • Organizer
      第52回日本免疫学会学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 末梢血細胞分画変動及びB細胞内シグナルへの影響から検証したべリムマブの役割2022

    • Author(s)
      西卓也、藤城真樹、早川国宏、鈴木智、池田圭吾、森本真司、山路健、田村直人
    • Organizer
      第66回日本リウマチ学会総会・学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] マウス新生児期における肝臓由来FGF21の神経系への作用2022

    • Author(s)
      芳田祐子、及川茉那、早川国宏、渡辺恵史
    • Organizer
      日本薬学会 第142年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Imiquimod induced lupus nephritis in NZBWF1 mice is developed through a unique mechanism different from spontaneous onset.2021

    • Author(s)
      Hayakawa K, Fujishiro M, Yoshida Y, Kataoka Y, Sakuma S, Nishi T, Ikeda K, Morimoto S, Sekigawa I
    • Organizer
      第50回日本免疫学会学術集会
    • Related Report
      2021 Research-status Report
  • [Presentation] Modification by Liver-derived Fibroblast growth factor (FGF) 21 of the b-klotho protein (KLB) expression in the central nerve system.2021

    • Author(s)
      Yoshida Y, Oikawa M, Hayakawa K, Watanabe Y
    • Organizer
      第50回日本免疫学会学術集会
    • Related Report
      2021 Research-status Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/fct2007

    • Related Report
      2023 Annual Research Report
  • [Remarks] 順天堂大学大学院医学研究科環境医学研究所 研究紹介

    • URL

      https://research-center.juntendo.ac.jp/kankyo_igaku/research/g6/

    • Related Report
      2023 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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