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Role of intestinal bacteria in the pathogenesis of autoimmune pancreatitis

Research Project

Project/Area Number 19K08468
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionKobe University

Principal Investigator

Inoue Jun  神戸大学, 医学部附属病院, 助教 (50631561)

Co-Investigator(Kenkyū-buntansha) 酒井 新  神戸大学, 医学部附属病院, 特定助教 (50792636)
児玉 裕三  神戸大学, 医学研究科, 教授 (80378687)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords自己免疫性膵炎 / 腸内細菌 / 腸管免疫 / 腸管免疫グロブリン
Outline of Research at the Start

自己免疫性膵炎(AIP)は血液中のIgG4抗体の上昇と、IgG4陽性形質細胞が膵臓に集まっているのが特徴であるが、病気が発症する機序は不明である。AIPの一部の患者で自己抗体が同定され、AIPはその発症に自己抗体が関与する疾患であるという概念(自分の抗体が自分の膵臓を攻撃する概念)が定着しつつある。しかしながら、AIPにおける自己抗体の形成メカニズムやその種類は明らかでない。この研究では、AIPにおける自己抗体の種類をスクリーニングし、それらの形成に腸内細菌がどのように関わっているかを解析する。

Outline of Final Research Achievements

Autoimmune pancreatitis (AIP) is an autoimmune-mediated pathology of unknown etiology characterized by elevated serum IgG4 levels. The purpose of this study is to analyze the state of intestinal immunity against intestinal bacteria in AIP and clarify its relationship with the pathology of AIP.
In this study, we analyzed the amount of each isotype of immunoglobulin secreted in the intestinal tract of AIP patients and clarified that the intestinal secretion of IgG4 is enhanced in AIP patients. Microbiome that bind to IgG4 abnormally secreted in the intestinal tract were isolated by MACS and FACA and analyzed by next-generation sequencing. In this study, changes in the state of intestinal immunity against microbiota in AIP were clarified, providing basic knowledge of the pathogenesis of AIP.

Academic Significance and Societal Importance of the Research Achievements

血清IgG4高値を特徴とした自己免疫的機序により起こる膵炎である自己免疫性膵炎(AIP)は、原因が不明であるため現時点で特異的な治療が存在しない。長期のステロイド治療による合併症や時に診断が困難な事などが問題となっており、メカニズム解明が重要である。本研究によりAIPにおける腸内細菌に対する腸管免疫の状態の変化が明らかとなり、AIPの病態解明につながる基礎的知見の一端となると考えられ社会的意義は大きいと考える。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (3 results)

All 2023 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results)

  • [Journal Article] Integrated analysis of tertiary lymphoid structures in relation to tumor-infiltrating lymphocytes and patient survival in pancreatic ductal adenocarcinoma2023

    • Author(s)
      Tanaka T, Masuda A, Inoue J, Hamada T, Ikegawa T, Toyama H, Sofue K, Shiomi H, Sakai A, Kobayashi T, Tanaka S, Nakano R, Yamada Y, Ashina S, Tsujimae M, Yamakawa K, Abe S, Gonda M, Masuda S, Inomata N, Uemura H, Kohashi S, Nagao K, Kanzawa M, Itoh T, Ueda Y, Fukumoto T, Kodama Y
    • Journal Title

      Journal of Gastroenterology

      Volume: 58 Issue: 3 Pages: 277-291

    • DOI

      10.1007/s00535-022-01939-8

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constitution of mucosa‐associated microbiota in the lower digestive tract does not change in early stage of non‐alcoholic fatty liver disease with fecal dysbiosis2022

    • Author(s)
      Asaji Naoki、Inoue Jun、Hayashi Hiroki、Tokunaga Eri、Shimamoto Yusaku、Kinoshita Masato、Tanaka Takeshi、Sakai Arata、Yano Yoshihiko、Ueda Yoshihide、Kodama Yuzo
    • Journal Title

      JGH Open

      Volume: 6 Issue: 10 Pages: 677-684

    • DOI

      10.1002/jgh3.12803

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comprehensive Analysis of Molecular Biologic Characteristics of Pancreatic Ductal Adenocarcinoma Concomitant with Intraductal Papillary Mucinous Neoplasm2022

    • Author(s)
      Tsujimae Masahiro、Masuda Atsuhiro、Inoue Jun et. al.
    • Journal Title

      Annals of Surgical Oncology

      Volume: 29 Issue: 8 Pages: 4924-4934

    • DOI

      10.1245/s10434-022-11704-z

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed

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Published: 2019-04-18   Modified: 2024-01-30  

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