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Identification of novel stromal cell tyep regulating body cavity immunity

Research Project

Project/Area Number 19K22531
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 49:Pathology, infection/immunology, and related fields
Research InstitutionOsaka University (2020-2022)
Kyoto University (2019)

Principal Investigator

Okabe Yasutaka  大阪大学, 免疫学フロンティア研究センター, 特任准教授(常勤) (50522124)

Project Period (FY) 2019-06-28 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords大網乳斑 / ストローマ細胞 / レチノイン酸 / ストローマ / 大網 / 体腔 / マクロファージ / リンパ球 / 中皮細胞
Outline of Research at the Start

腹腔は、腹膜で囲まれた閉鎖空間である。腹腔は単なる空所ではなく、多数の免疫細胞が局在することで独自の免疫コンパートメントを形成する。腹腔と循環系の間には常時、免疫細胞の交換が起こっているが、免疫細胞がどのようにして閉鎖空間である腹腔に流入し、そして腹腔外へと流出するのか、そのメカニズムは明らかにされていない。今回、腹腔の免疫細胞の移動を制御すると考えられる新規中皮細胞を同定した。本研究では、この中皮細胞を解析することで腹腔免疫細胞の移動メカニズムを明らかにする。

Outline of Final Research Achievements

Lymphoid clusters in visceral adipose tissue omentum, known as milky spots, play a central role in the immunological defense in the abdomen, whereas the mechanism regulating milky spot development and maturation are poorly understood. In this study, we identified a subset of fibroblastic reticular cells (FRCs) that are uniquely present in omental milky spots. These FRCs were characterized by the expression of retinoic acid converting enzyme, Aldh1a2, and endothelial cell marker, Tie2, in addition to canonical FRC-associated genes. Diphtheria toxin-mediated ablation of Aldh1a2+ FRCs resulted in the alteration in milky spot structure with a significant reduction in size and cellularity. Mechanistically, Aldh1a2+ FRCs regulated the display of chemokine CXCL12 on high endothelial venules (HEVs), which recruit blood-borne lymphocytes from circulation. We further found that Aldh1a2+ FRCs are required for the maintenance of peritoneal lymphocyte composition. These

Academic Significance and Societal Importance of the Research Achievements

本研究により、腹腔内の病原体侵入の監視・応答を担う大網乳斑に特異的に存在する新しいストローマ細胞が同定されたとともに、これまでほとんど明らかにされてこなかった大網乳斑の形成メカニズムの一端が解明された。これらの知見は、腹腔内感染症および致死性の敗血症のメカニズムの理解や治療法の開発へ繋がる可能性が期待される。

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

    (11 results)

All 2023 2022 2021 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (5 results) (of which Invited: 5 results) Book (1 results) Remarks (2 results)

  • [Journal Article] Aldh1a2 + fibroblastic reticular cells regulate lymphocyte recruitment in omental milky spots2023

    • Author(s)
      Yoshihara T., & Okabe Y.
    • Journal Title

      Journal of experimental medicine

      Volume: 220 Issue: 5

    • DOI

      10.1084/jem.20221813

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Macrophage plasticity in homeostasis and diseases2022

    • Author(s)
      Okabe Y.
    • Journal Title

      Rinsho Ketsueki

      Volume: 63 Issue: 5 Pages: 368-372

    • DOI

      10.11406/rinketsu.63.368

    • ISSN
      0485-1439, 1882-0824
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Immune Niche Within the Peritoneal Cavity2021

    • Author(s)
      Yasutaka Okabe
    • Journal Title

      Current Topics of Microbiology and Immunology

      Volume: 434 Pages: 123-134

    • DOI

      10.1007/978-3-030-86016-5_6

    • ISBN
      9783030860158, 9783030860165
    • Related Report
      2021 Research-status Report
  • [Presentation] Stromal-immune cell interaction in homeostasis formation of non-classical lymphoid organ2023

    • Author(s)
      Okabe Y.
    • Organizer
      第100回日本生理学学会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Regulation of Body Cavity Immunity2021

    • Author(s)
      Yasutaka Okabe
    • Organizer
      第73回日本細胞生物学会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Macrophage Plasticity in Homeostasis and Diseases2021

    • Author(s)
      Yasutaka Okabe
    • Organizer
      第83回日本血液学会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 免疫の『場』としての脂肪組織2019

    • Author(s)
      岡部泰賢
    • Organizer
      第40回 日本炎症・再生医学会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 境界から細胞社会を見る2019

    • Author(s)
      岡部泰賢
    • Organizer
      第6回 個体の中の細胞社会学ワークショップ
    • Related Report
      2019 Research-status Report
    • Invited
  • [Book] 炎症と免疫2021

    • Author(s)
      新庄記子、岡部泰賢
    • Total Pages
      4
    • Publisher
      先端医学社
    • Related Report
      2021 Research-status Report
  • [Remarks] お腹の中に免疫系が形成される仕組みを明らかに

    • URL

      https://resou.osaka-u.ac.jp/ja/research/2023/20230301_1

    • Related Report
      2022 Annual Research Report
  • [Remarks] Got milky spots?

    • URL

      https://www.asiaresearchnews.com/content/got-milky-spots

    • Related Report
      2022 Annual Research Report

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Published: 2019-07-04   Modified: 2024-01-30  

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