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Establishment of a Novel Periodontal Therapy Based on the Action of Immune Checkpoint Molecule (CTLA-4)

Research Project

Project/Area Number 22K21071
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0907:Oral science and related fields
Research InstitutionTokyo Dental College

Principal Investigator

Koyachi Saki  東京歯科大学, 歯学部, 非常勤講師 (90962134)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords歯周病 / CTLA-4 / 歯槽骨吸収 / 破骨細胞 / 免疫チェックポイント / 破骨細胞分化 / 歯周炎
Outline of Research at the Start

本研究では,破骨細胞分化におけるシグナル伝達経路を制御し,Lipopolysaccharide誘発性骨吸収を調節することが報告されている脱リン酸化酵素,PP2Aに着目し,CTLA-4がどの様な機構で破骨細胞分化の調整にかかわるのかを詳細に解析する。またin vivoでは,CD80/86非存在下においてもCTLA-4が他の経路を介して骨吸収に影響を及ぼす可能性があることを踏まえ,CD80/86-/-マウスを用い,CTLA-4投与後の歯周組織の動態を評価する。また,治療法確立へのアプローチとして,歯周炎マウスモデルへのCTLA-4-Ig局所投与を行い,歯周組織や他の骨格へ及ぼす影響を評価する。

Outline of Final Research Achievements

The aim of this study was to investigate the detailed mechanism of CTLA-4 regulation of osteoclast differentiation. RANKL and CTLA-4-Ig were added to RAW264.7 cells, which are osteoclast progenitor cells, and the effects of CTLA-4-Ig on NF-κB activation were evaluated by Western blot analysis. The expression of osteoclast differentiation markers was measured by qRT-PCR, and the number of osteoclast-like cells was evaluated by TRAP staining. In the PP2A siRNA group, no suppression of Cathepsin K or Trap expression was observed upon addition of CTLA-4-Ig. The number of osteoclast-like cells tended to increase in the PP2A siRNA group compared to the control siRNA group.
This suggests that regulation of the NF-κB pathway and PP2A expression is one of the mechanisms by which CTLA-4-Ig suppresses osteoclast differentiation.

Academic Significance and Societal Importance of the Research Achievements

我々はこれまでに,免疫チェックポイント分子の一つである細胞傷害性Tリンパ球関連抗原4 (CTLA-4) が破骨細胞分化を抑制し,歯周炎マウスモデルにおける歯槽骨吸収量を減少させることを明らかにした。本研究はそのメカニズムを解明することを目的とし,成果としてNF-κB 経路とPP2A 発現の調節が,CTLA-4-Ig による破骨細胞分化抑制メカニズムの一つであることが示唆された。本申請研究から得られた知見は,歯周炎における歯槽骨吸収メカニズム解明の一助となり,新たな歯周治療の開発基盤となり得ると考えられる。

Report

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

    (1 results)

All 2022

All Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] The potential mechanism of CTLA-4-Ig-mediated osteoclast differentiation2022

    • Author(s)
      Saki Nakane-Koyachi, Kentaro Imamura, Tasuku Murakami, Rio Hisanaga, Kazuyuki Ishihara, Atsushi Saito
    • Organizer
      第108回アメリカ歯周病学会共催日本臨床歯周病学会・日本歯周病学会2022大会
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-09-01   Modified: 2025-01-30  

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