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Analysis of immunological mechanisms for persistent infection with Cryptococcus neoformans and its reactivation using a novel animal model

Research Project

Project/Area Number 21H02965
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 54030:Infectious disease medicine-related
Research InstitutionTohoku University

Principal Investigator

Kawakami Kazuyoshi  東北大学, 医学系研究科, 名誉教授 (10253973)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2023: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2021: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Keywordsクリプトコックス / 潜在性感染 / 内因性再燃 / 動物モデル / 免疫機序 / 潜伏感染 / メモリーT細胞
Outline of Research at the Start

世界のエイズ死因第2位のクリプトコックス髄膜炎は、潜伏感染後に再活性化することで発症するとの認識に変わりつつある。しかし、その詳細については未だ不明であり、適切な動物モデルを用いた研究が求められている。我々は、本真菌の主要なT細胞抗原を特異的に認識する受容体を高発現するトランスジェニックマウスを樹立し、本マウスを用いた潜伏感染・再活性化発症モデルの作製に成功している。本研究では、このモデルを用いることで、クリプトコックスの潜伏感染及び再活性化発症について解析し、その免疫機序を明らかにする。

Outline of Final Research Achievements

Recently, it has been considered that cryptococcosis may be developed by reactivation of latently infected Cryptococcus neoformans in lungs. In our previous study, we succeeded in creating a latent infection (LCNI) model using a transgenic mouse that highly expresses a cryptococcal-specific T cell antigen receptor. In the present study, we attempted to create an endogenous reactivation model by administering various immunosuppressants to this LCNI model. When fingolimod, a novel immunosuppressant, was administered to this model, an increase in the number of fungi in the lungs and a decrease in Th1 immune responses were observed. Using this model, we focused our analysis on effector T cells and memory T cells in the lungs to clarify the immune mechanisms leading from LCNI to endogenous reactivation.

Academic Significance and Societal Importance of the Research Achievements

近年、クリプトコックス症は潜在性感染後に免疫不全により内因性再燃すると考えられている。本研究では、我々が樹立した本真菌に特異的なT細胞受容体を高発現するトランスジェニックマウスを用いることで作製した潜在性感染モデルに免疫抑制剤を投与することで内因性再燃モデルの作製に成功した。今後、より詳細な免疫機序を明らかにすることで、臨床的に重要なクリプトコックス髄膜炎の発症病態の解明に迫ることができるものと期待される。

Report

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

    (11 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (5 results) (of which Invited: 2 results) Book (2 results)

  • [Journal Article] PAMPs and Host Immune Response in Cryptococcal Infection2022

    • Author(s)
      Ko Sato, Kazuyoshi Kawakami
    • Journal Title

      Medical Mycology Journal

      Volume: 63 Issue: 4 Pages: 133-138

    • DOI

      10.3314/mmj.22.005

    • ISSN
      2185-6486, 2186-165X
    • Year and Date
      2022-10-31
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Immune System to Cryptococcal Infection and Immune Dysfunction Leading to Putative Endogenous Reactivation2022

    • Author(s)
      笠松 純, 川上和義
    • Journal Title

      Nihon Ishinkin Gakkai Zasshi

      Volume: 63 Issue: 3 Pages: 47-58

    • DOI

      10.11534/ishinkin.22.005

    • ISSN
      2434-5229, 2434-5237
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deficiency of lung-specific claudin-18 leads to aggravated infection with Cryptococcus deneoformans through dysregulation of the microenvironment in lungs2021

    • Author(s)
      Sato K, Matsumoto I, Suzuki K, Tamura A, Shiraishi A, Kiyonari H, Kasamatsu J, Yamamoto H, Miyasaka T, Tanno D, Miyahara A, Zong T, Kagesawa T, Oniyama A, Kawamura K, Kitai Y, Umeki A, Kanno E, Tanno H, Ishii K, Tsukita S, Kawakami K
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 21110-21110

    • DOI

      10.1038/s41598-021-00708-6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of Dectin-2 in the Phagocytosis of Cryptococcus neoformans by Dendritic Cells2021

    • Author(s)
      Kitai Yuki、Sato Ko、Tanno Daiki、Yuan Xiaoliang、Umeki Aya、Kasamatsu Jun、Kanno Emi、Tanno Hiromasa、Hara Hiromitsu、Yamasaki Sho、Saijo Shinobu、Iwakura Yoichiro、Ishii Keiko、Kawakami Kazuyoshi
    • Journal Title

      Infection and Immunity

      Volume: 89 Issue: 10 Pages: 1-10

    • DOI

      10.1128/iai.00330-21

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] クリプトコックス潜伏感染モデルにおけるFingolimod (FTY720) 投与による内因性再燃の免疫機序の解明2023

    • Author(s)
      吉田美智子,中畑那奈,篠宮岳志,佐藤隼人,佐藤 光,菅野恵美,丹野寛大,石井恵子,川上和義
    • Organizer
      第97回日本感染症学会総会・学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Immunological mechanism for reactivated cryptococcosis in persistently infected mice after treatment with FTY720.2022

    • Author(s)
      Michiko Yoshida, Nana Nakahata, Takeshi Shinomiya, Hayato Sato, Ko Sato, Jun Kasamatsu, Emi Kanno, Hiromasa Tanno, Keiko Ishii, Kazuyoshi Kawakami
    • Organizer
      第51回日本免疫学会学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 潜在性感染からの内因性再燃機序:クリプトコックス感染モデルを用いた解析2021

    • Author(s)
      川上和義
    • Organizer
      第95回日本感染症学会総会・学術講演会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Host immune response to fungal infection2021

    • Author(s)
      Sato K, Kawakami K
    • Organizer
      第65回日本医真菌学会総会・学術集会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Poly(I:C)をアジュバントとしたクリプトコックス酸化鉄ナノ粒子ワクチンによるTh1型抗体産生の誘導2021

    • Author(s)
      篠宮岳志, 梅木彩, 野末彩文, 佐藤光, 笠松純, 石井恵子, 川上和義
    • Organizer
      第95回日本感染症学会総会・学術講演会
    • Related Report
      2021 Annual Research Report
  • [Book] Mouse model of latent cryptococcal infection and reactivation. In: Anti-Fungal Immunity, Methods in Molecular Biology (Ed. Drummond, R.).2023

    • Author(s)
      Ko Sato, Kazuyoshi Kawakami
    • Publisher
      Springer-Verlag New York Inc.
    • Related Report
      2022 Annual Research Report
  • [Book] Adoptive transfer of Cryptococcus neoformans-specific CD4 T-cells to study anti-fungal lymphocyte responses in vivo. In: Anti-Fungal Immunity, Methods in Molecular Biology (Ed. Drummond, R.).2023

    • Author(s)
      Man Shun Fu, Kazuyoshi Kawakami K, Rebecca Drummond
    • Publisher
      Springer-Verlag New York Inc.
    • Related Report
      2022 Annual Research Report

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

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