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Elucidating Leptospira interrogans strategies to disassemble the junctional complex

Research Project

Project/Area Number 21H02732
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionUniversity of the Ryukyus

Principal Investigator

TOMA Claudia  琉球大学, 医学(系)研究科(研究院), 准教授 (40325832)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2023: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2021: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywordsレプトスピラ / 尿細管上皮細胞 / 細胞間接着装置 / 上皮細胞
Outline of Research at the Start

レプトスピラ症は、病原性レプトスピラによって引き起こされる人獣共通感染症である。レプトスピラ症は急性熱性疾患であり、軽症型から黄疸・出血症状・多臓器不全などを伴う重症型まで臨床症状には多様性がある。レプトスピラ症の抗菌薬による早期治療は効果的であるが、抗菌薬使用による副作用が問題となっており、新たな治療法の開発が求められている。
細胞間接着装置は、上皮細胞シートのバリアとして働き、臓器機能の維持にも重要である。本研究では、細胞間接着装置の破壊がどのような分子を介して行われているかを明らかにし、レプトスピラの標的臓器への移行を遮断するための新たな治療法への分子基盤構築を目指す。

Outline of Final Research Achievements

Leptospira interrogans disseminates hematogenously to reach the target organs by disrupting the epithelial apical junctional complex (AJC). E-cadherin is a transmembrane protein of the AJCs and is critical for maintaining AJC organization and epithelial tissue barrier function. We have reported that L. interrogans induces E-cadherin endocytosis and cytoskeletal rearrangement during AJC disassembly. In this study, we combine proteomic and imaging analysis with chemical inhibition studies to demonstrate that disrupting the AJCs of epithelial cells involves the degradation of E-cadherin scaffolding proteins, p0071 and p120-catenin. The degradation of these proteins is achieved by co-opting the lysosomal and the ubiquitin proteasome system of the host cell. The degradation of p0071 and p120-catenin induced the decreased E-cadherin membrane localization, thus, this strategy may allow L. interrogans to disassemble AJCs
and disseminate through the body efficiently.

Academic Significance and Societal Importance of the Research Achievements

本研究でレプトスピラは宿主真核細胞のタンパク質分解系をハイジャックすることによって、p0071とp120-カテニンを分解し、細胞間接着装置が破壊されることを明らかにした。本研究で得られた新規知見は、レプトスピラ症の病態形成メカニズムの理解に寄与し、本感染症を制御するためには、複数の経路が抑制可能であることがわかった。
レプトスピラがどのように宿主真核細胞のタンパク質分解系を利用するかを明らかになることによって、必須細菌因子や細胞内伝達経路を阻止し、レプトスピラ症を制御できる新たな治療法の開発が期待できる。

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 Other

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

  • [Journal Article] Degradation of p0071 and p120-catenin during adherens junction disassembly by Leptospira interrogans2023

    • Author(s)
      Tokumon Romina、Sebastian Isabel、Humbel Bruno M.、Okura Nobuhiko、Yamanaka Hidenori、Yamashiro Tetsu、Toma Claudia
    • Journal Title

      Frontiers in Cellular and Infection Microbiology

      Volume: 13 Pages: 01-19

    • DOI

      10.3389/fcimb.2023.1228051

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Analysis of human clinical and environmental Leptospira to elucidate the eco-epidemiology of leptospirosis in Yaeyama, subtropical Japan2022

    • Author(s)
      Sato Yukuto、Hermawan Idam、Kakita Tetsuya、Okano Sho、Imai Hideyuki、Nagai Hiroto、Kimura Ryosuke、Yamashiro Tetsu、Kajita Tadashi、Toma Claudia
    • Journal Title

      PLOS Neglected Tropical Diseases

      Volume: 16 Issue: 3 Pages: e0010234-e0010234

    • DOI

      10.1371/journal.pntd.0010234

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Disassembly of the apical junctional complex during the transmigration of Leptospira interrogans across polarized renal proximal tubule epithelial cells2021

    • Author(s)
      Sebastian I, Okura N, Humbel BM, Xu J, Hermawan I, Matsuura C, Hall M, Takayama C, Yamashiro T, Nakamura S, Toma C
    • Journal Title

      Cellular Microbiology

      Volume: 印刷中 Issue: 9 Pages: 1-17

    • DOI

      10.1111/cmi.13343

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] レプトスピラによる宿主細胞の蛋白質分解系のハイジャック2023

    • Author(s)
      トクモン ・ロミナ、セバスティアン・イサベル、ホンベル・ブルーノ、 大倉 信彦、山城 哲、トーマ・クラウディア
    • Organizer
      第59回レプトスピラ・シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] Degradation of p120-catenin proteins during leptospiral disruption of the junctional complex2023

    • Author(s)
      Tokumon R., Sebastian I, Yamashiro T., & Toma C.
    • Organizer
      96th Annual Meeting of Japanese Society for Bacteriology
    • Related Report
      2022 Annual Research Report
  • [Presentation] Elucidating Leptospira interrogans strategies to disassemble the junctional complex.2022

    • Author(s)
      Tokumon R., Oonishi M., Sebastian I., Yamashiro T., & Toma C.
    • Organizer
      58th Annual Meeting of the Japanese Leptospirosis Research Conference
    • Related Report
      2022 Annual Research Report
  • [Presentation] Leptospira interrogans strategies for Junctional Complex disassembling.2022

    • Author(s)
      Tokumon R, Sebastian I, Yamashiro T, & Toma C.
    • Organizer
      Kyushu Microbial Research Forum 2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] Leptospira interrogans induces decrease of proteins involved in junction stabilization2022

    • Author(s)
      Romina Tokumon, Isabel Sebastian, Yuta Hashimoto, Tetsu Yamashiro, Claudia Toma
    • Organizer
      第95回日本細菌学会総会
    • Related Report
      2021 Annual Research Report
  • [Remarks] 病原細菌がヒトの細胞をハイジャックし、細胞同士を引き剥がすことが判明

    • URL

      https://www.u-ryukyu.ac.jp/news/49178/

    • Related Report
      2023 Annual Research Report
  • [Remarks] 世界遺産・西表島における「レプトスピラ症」の病原体を 土壌培養と環境DNAから総合分析

    • URL

      https://www.u-ryukyu.ac.jp/news/32817/

    • Related Report
      2022 Annual Research Report
  • [Remarks] 病原細菌が臓器を壊して感染する仕組みを解明~レプトスピラ症の新しい予防・治療法開発に期待~

    • URL

      https://www.u-ryukyu.ac.jp/news/22330/

    • Related Report
      2021 Annual Research Report

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

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