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Contribution of platelet-activating receptor CLEC-2 in the pathogenesis of cancer-associated thrombosis.

Research Project

Project/Area Number 20K17374
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 54010:Hematology and medical oncology-related
Research InstitutionUniversity of Yamanashi

Principal Investigator

Shirai Toshiaki  山梨大学, 大学院総合研究部, 助教 (50710381)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords血小板 / CLEC-2 / 癌関連血栓症
Outline of Research at the Start

癌は血小板や凝固系を活性化させて致死的な血栓症を引き起こす。血栓症は癌患者の2番目の死因であり、その予防・治療は重要な課題である。しかしながら、既存の抗血小板薬や抗凝固薬は出血の副作用があるため、新たな治療法が期待されている。本研究では、我々が同定した血小板活性化受容体CLEC-2の癌関連血栓症の病態形成における機能についてマウスモデルを用いて明らかにし、CLEC-2が癌関連血栓症の治療標的になるか調査する。

Outline of Final Research Achievements

Three cancer cell lines (LLC, Pan02, MC-38) were transplanted into mice. Immunohistological analysis revealed abundant podoplanin-positive cancer-associated fibroblasts (CAFs) in tumors. Extracellular vesicles (EVs) isolated from cultured CAFs from LLC tumors revealed the presence of podoplanin in the EVs and that CAF-EVs activate platelets in a CLEC-2-dependent manner.
Plasma podoplanin levels were elevated in LLC-bearing mice. In a model of femoral vein thrombosis induced by ferric chloride injury, CAF-EVs administration and LLC tumorigenesis shortened the vascular occlusion time. Antibody-induced CLEC-2 depletion inhibited the exacerbating effects of CAF-EVs and tumor in venous thrombosis.

Academic Significance and Societal Importance of the Research Achievements

CLEC-2は血小板・巨核球にほぼ特異的に発現している。そのリガンドのポドプラニンは正常状態では血管内に存在しない。したがって、CLEC-2の止血機能への寄与は非常に小さく、実際にCLEC-2欠損マウスは出血傾向を示さない。しかし腫瘍が形成されると、癌細胞やCAFsからポドプラニンが発現し、細胞間相互作用あるいはEVsによってCLEC-2依存的な血小板活性化を惹起する。すなわち、ポドプラニン/CLEC-2はCAT特異的な血栓形成機序である。すなわち、抗CLEC-2療法は、従来の抗血小板薬よりも安全に使用できる抗CAT戦略と考えられる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2022

All Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Presentation] 血小板活性化受容体CLEC-2と癌関連血栓症の病態2022

    • Author(s)
      白井俊光, 井上克枝
    • Organizer
      第54回日本動脈硬化学会総会・学術集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 癌関連線維芽細胞はCLEC-2/PDPNを介して癌関連血栓症を増悪させる2022

    • Author(s)
      白井俊光, 佐々木知幸, 築地長治, 大石沙織, 横森良平, 髙野勝弘, 井上克枝
    • Organizer
      第44回日本血栓止血学会学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Cancer-associated fibroblasts promote venous thrombosis through C-type lectin-like receptor 2/podoplanin in 3LL lung cancer mouse model2022

    • Author(s)
      Toshiaki Shirai, Tomoyuki Sasaki, Nagaharu Tsukiji, Saori Oishi, Ryohei Yokomori, Katsuhiro Takano, Katsue Suzuki-Inoue
    • Organizer
      ISTH2022 Congress
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 癌関連線維芽細胞はCLEC-2/PDPNを介して癌関連血栓症を増悪させる2022

    • Author(s)
      白井俊光
    • Organizer
      日本血栓止血学会学術集会2022
    • Related Report
      2021 Research-status Report
  • [Presentation] Cancer-associated fibroblasts promote venous thrombosis through C-type lectin-like receptor 2/podoplanin in 3LL lung cancer mouse model2022

    • Author(s)
      白井俊光
    • Organizer
      国際血栓止血学会学術集会2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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