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Investigation of exhaustion-inducing factors and the mechanisms of exhaustion in canine chimeric antigen receptor T cells

Research Project

Project/Area Number 22K15018
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 42020:Veterinary medical science-related
Research InstitutionAzabu University

Principal Investigator

Yoshimoto Sho  麻布大学, 獣医学部, 学振研究員 (70909168)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
KeywordsCAR-T細胞 / T細胞の疲弊 / 免疫チェックポイント分子 / PD-1/PD-L1 / がん免疫 / がん / イヌ / 遺伝子改変 / 腫瘍 / 共抑制分子
Outline of Research at the Start

がんは、ヒトとイヌの主要な死亡原因である。進行がんに対しても有効な治療法の開発が望まれており、近年がん免疫療法の一つであるキメラ抗原受容体発現T(CAR-T)細胞療法への注目が高まっている。
しかし、CAR-T細胞は一部の血液がん患者において優れた治療効果を示したものの、固形がんを中心に他のがん種で十分な治療効果は未だ確認されていない。
本研究では、他のがん種でも有効なCAR-T細胞療法の開発に向け、CAR-T細胞の治療効果を減弱する要因の一つとして考えられるCAR-T細胞の疲弊のメカニズムの一端を明らかにする。

Outline of Final Research Achievements

The aim of this study was to elucidate the mechanisms of CAR-T cell exhaustion, which reduces the therapeutic efficacy of CAR-T cell therapy. To induce CAR-T cell exhaustion, canine CAR-T cells were repeatedly stimulated with target antigens, and the process leading to exhaustion was evaluated. Our study revealed that canine CAR-T cells expressed exhaustion-related markers, accompanied by a gradual decline in their proliferation and cytotoxic abilities, ultimately resulting in functional impairment. Additionally, it was found that PD-L1-expressing cells contribute to the dysfunction of canine CAR-T cells and that PD-1 signal inhibition alleviates the suppression of CAR-T cell function caused by PD-L1. These findings provide insights into the mechanisms of canine CAR-T cell exhaustion.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、イヌCAR-T細胞の疲弊の誘導に成功し、免疫チェックポイント分子の発現変化や機能不全に陥るまでの過程を明らかにしたことである。また、PD-1シグナル阻害がイヌCAR-T細胞の機能不全や疲弊に与える影響についても明らかにできた。これらは、CAR-T細胞療法の改善策を検討するための重要な知見である。社会的意義としては、CAR-T細胞の疲弊を防ぐ新たな戦略を提示したことで、イヌおよびヒトのがん患者に対するCAR-T細胞の治療効果の向上が期待されることである。特に、難治性がんの治療において、CAR-T細胞療法の適用範囲を拡大し、治療効果を最大化するための手がかりとなる研究である。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (4 results)

All 2024 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] ペンシルベニア大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Development and pharmacokinetic assessment of a fully canine anti-PD-1 monoclonal antibody for comparative translational research in dogs with spontaneous tumors2023

    • Author(s)
      Yoshimoto Sho、Chester Nicholas、Xiong Ailian、Radaelli Enrico、Wang Hong、Brillantes Marc、Gulendran Gayathri、Glassman Patrick、Siegel Don L.、Mason Nicola J.
    • Journal Title

      mAbs

      Volume: 15 Issue: 1 Pages: 2287250-2287250

    • DOI

      10.1080/19420862.2023.2287250

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] A PD-1/CD28 chimeric switch receptor augments canine chimeric antigen receptor T cell function against PD-L1 expressing target cells2024

    • Author(s)
      Sho Yoshimoto, Antonia Rotolo, Kay Foos, Lauren Olnenick, Satoshi Takagi, Nicola J. Mason
    • Organizer
      World Veterinary Cancer Congress 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Developing and evaluating CAR-T cells for use in canine cancer patients to inform human clinical translation2022

    • Author(s)
      Yoshimoto S, Kasper B, Rotolo A, Nakagawa T, Takagi S, Mason NJ
    • Organizer
      第81回 日本癌学会学術総会
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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