• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Pathological roles of brain-infiltrating T cells at an early stage of Alzheimer's disease

Research Project

Project/Area Number 21K15473
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49070:Immunology-related
Research InstitutionKeio University

Principal Investigator

Ohyagi Masaki  慶應義塾大学, 医学部(信濃町), 特任助教 (70882497)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords神経免疫 / 神経炎症 / 認知症疾患 / 神経変性疾患 / 細胞免疫
Outline of Research at the Start

アルツハイマー病(AD)患者の脳では、アミロイドβやリン酸化tauの脳内凝集が特徴的な病理変化であり、病変部位には活性化したグリア細胞に加え、種々のT細胞の浸潤が認められる。従来の脳内炎症研究の多くは、活性化グリア細胞を中心に進められており、免疫応答において抗原特異的に働く脳内T細胞の関与については未だ明らかでない。本研究では、脳内のアミロイド病理において浸潤T細胞が担う役割を明確にし、その分子病態と制御機構を解析することで、脳浸潤T細胞と神経細胞やグリア細胞との関係性を解明する。さらに脳浸潤T細胞の自己抗原の同定など新たな知見の創出や革新的な治療戦略への導出を目指す。

Outline of Final Research Achievements

Growing evidence has suggested a critical role for neuroinflammation and immune dysfunction in Alzheimer's disease (AD). In addition to microglia, the innate immune cells in the brain, adaptive immune cells also face phenotypic alternation on AD progression. In this study using a mouse mode of AD, we demonstrated that clonally expanded CD8 T cells exhibit protective functions at an early stage of amyloid pathology; however, they inhibit amyloid plaque accumulation in the late phase of AD progression. Single-cell transcriptomic analysis revealed that brain CD8 T cells modify disease-associated microglia phenotypes through chemokine-signaling pathways, and impact amyloid pathology dependent on T cell receptor clonotypes.

Academic Significance and Societal Importance of the Research Achievements

近年、AD患者脳や脳脊髄液中でオリゴクローナルに増殖するCD8陽性T細胞が着目されているが、その病理学的意義についてはアミロイド病理に促進的あるいは抑制的いずれの報告もあり定まっていない。本研究により、アミロイド病態の病期に応じて脳浸潤CD8陽性T細胞は多様な作用を発揮し、アミロイド病理の進行に関与していることが明らかとなった。今後CD8陽性T細胞の機能修飾によるADの疾患修飾治療を検討する際には、患者の病期に応じた個別化治療戦略が必要と考えられる。

Report

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

    (5 results)

All 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (4 results)

  • [Journal Article] T cells in the brain inflammation.2023

    • Author(s)
      Yoshimura A, Ohyagi M, Ito M.
    • Journal Title

      Adv Immunol.

      Volume: 157 Pages: 29-58

    • DOI

      10.1016/bs.ai.2022.10.001

    • ISBN
      9780443193286
    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Clonally expanded CD8 T cells at an early stage of β-amyloid pathology2023

    • Author(s)
      Masaki Ohyagi, Minako Ito, Akihiko Yoshimura
    • Organizer
      The 46th Annual Meeting of the Japanese Neuroscience Society
    • Related Report
      2023 Annual Research Report
  • [Presentation] Clonally expanded CD8 T cells at an early stage of beta-amyloid pathology2023

    • Author(s)
      Masaki Ohyagi, Mana Iizuka-koga, Minako Ito, Akihiko Yoshimura
    • Organizer
      64th Annual Meeting of the Japanese Society of Neurology
    • Related Report
      2023 Annual Research Report
  • [Presentation] Peripheral Lipopolysaccharides Challenge Aggravates β-amyloid Pathology in App knock-in Mouse Model2022

    • Author(s)
      Masaki Ohyagi
    • Organizer
      第63回日本神経学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Clonally expanded CD8+ T cells in early phase of β-amyloid pathology in Alzheimer’s disease model mouse2022

    • Author(s)
      Masaki Ohyagi, Minako Ito, Akihiko Yoshimura
    • Organizer
      第51回日本免疫学会学術集会
    • Related Report
      2022 Research-status Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi