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Is regulatory B cell the cause of immunodeficiency in sepsis?: The relationship with PD-L1 expression

Research Project

Project/Area Number 19K18327
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 55060:Emergency medicine-related
Research InstitutionEhime University

Principal Investigator

Matsumoto Hironori  愛媛大学, 医学系研究科, 助教 (70772531)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords敗血症 / PD-L1 / IL-5 / 制御性B細胞 / IL-10
Outline of Research at the Start

敗血症の病態の一つの免疫抑制が注目されており、PD-1/PD-L1相互作用を抑制する抗体投与によるTリンパ球の免疫賦活の有効性も報告された。しかし、敗血症における免疫反応は詳細には把握されていない。本研究では、これまで敗血症研究においてはあまり着目されてこなかったB細胞に着目している。我々は、敗血症モデルマウスにおいて、超急性期にB細胞が激減する一方、IL-10産生性制御性B細胞のみは残存し、PD-L1を発現することを見出した。PD-L1/PD-1相互作用によるT細胞反応の抑制が、敗血症の予後悪化に結びつく免疫抑制状態の本態と見て、その病態解明や、抗PD-1抗体などの治療の有効性を見出したい。

Outline of Final Research Achievements

In recent years, the immunosuppressive state, one of the pathologies of sepsis, has been attracting attention, but the immune response in sepsis is not well understood in detail. Through animal experiments, we analyzed the dynamics of immune cells associated with sepsis and found that while B cells drastically decrease in the acute phase, only IL-10 producing regulatory B cells remain and express PD-L1. In the current study, IL-5 was found to be associated with survival rate, coagulation disorders, and bacterial clearance in the peritoneal cavity during the septic state. IL-5 production by Th2 and ILC-2 cells was confirmed in the peritoneal cavity; however, no correlation was observed between IL-5 and the expression of PD-1 and PD-L1.

Academic Significance and Societal Importance of the Research Achievements

近年、PD-1/PD-L1の相互作用を抑制し、T細胞の活性化抑制を阻止することよる免疫賦活療法が、癌治療で劇的な効果を上げ注目を浴びている。今回、敗血症におけるPD-1抗体の敗血症への応用を目的として、PD-1、PD-L1の発現との関連を中心とした、敗血症に特徴的な免疫応答を明らかとすることである。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (5 results)

  • [Journal Article] 急性病態における血液凝固線溶動態の解明と治療戦略の構築2021

    • Author(s)
      松本紘典
    • Journal Title

      炎症と免疫

      Volume: 29 Pages: 82-86

    • Related Report
      2021 Research-status Report 2020 Research-status Report
  • [Journal Article] ADAMTS13 activity decreases in the early phase of trauma associated with coagulopathy and systemic inflammation: a prospective observational study2021

    • Author(s)
      Matsumoto H, Takeba J, Umakoshi K, Kikuchi S, Ohshita M, Annen S, Moriyama N, Nakabayashi Y, Sato N, Aibiki M
    • Journal Title

      Thrombosis Journal

      Volume: 19 Issue: 1 Pages: 17-17

    • DOI

      10.1186/s12959-021-00270-1

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Perioperative coagulofibrinolytic responses in colorectal surgery patients without chemical thromboprophylaxis: a retrospective observational study2021

    • Author(s)
      Matsumoto H, Ishimaru K, Kikuchi S, Akita S, Yamamoto Y, Yoshida M, Koga S, Egi H, Watanabe Y
    • Journal Title

      Surgery Today

      Volume: - Issue: 6 Pages: 904-913

    • DOI

      10.1007/s00595-021-02393-4

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] B lymphocytopenia and Bregs in a not-to-die murine sepsis model.2020

    • Author(s)
      Umakoshi K, Choudhury ME, Nishioka R, Matsumoto H, Abe N, Nishikawa Y, Kikuchi S, Takeba J, Yano H, Yorozuya T, Sato N, Aibiki M, Tanaka J.
    • Journal Title

      Biochem Biophys Res Commun.

      Volume: 523 Issue: 1 Pages: 202-207

    • DOI

      10.1016/j.bbrc.2019.12.041

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 急性病態の凝固線溶動態とDIC2021

    • Author(s)
      松本紘典
    • Organizer
      DIC治療 Webセミナー (JB 日本血液製剤機構)
    • Related Report
      2021 Research-status Report
  • [Presentation] DICを説明できるようになろう2021

    • Author(s)
      松本紘典
    • Organizer
      ER ICU ASSISTセミナー (2) (旭化成ファーマ)
    • Related Report
      2021 Research-status Report
  • [Presentation] 重症COVID-19症例のFDP上昇時の凝固線溶活性の検討2021

    • Author(s)
      松本紘典
    • Organizer
      第49回日本救急医学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] 急性病態の凝固線溶動態とDIC2021

    • Author(s)
      松本紘典
    • Organizer
      DIC治療Webセミナー
    • Related Report
      2020 Research-status Report
  • [Presentation] 侵襲に対する急性期の病的凝固線溶反応指標としてのFDP2020

    • Author(s)
      松本紘典
    • Organizer
      日本救急医学会総会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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