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

Development of diagnostic and therapeutic approach for vulnerable atherosclerotic plaques focusing on near infrared autofluorescent particles

Research Project

Project/Area Number 22K20911
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0903:Organ-based internal medicine and related fields
Research InstitutionNiigata University

Principal Investigator

Ikegami Ryutaro  新潟大学, 医歯学系, 助教 (20815360)

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不安定プラーク / 分子イメージング / 泡沫化マクロファージ / 自家蛍光 / 血管内イメージング / リソソーム / マクロファージ / 炎症性サイトカイン
Outline of Research at the Start

安定狭心症に対する経皮的冠動脈形成術は生命予後を改善しないことが報告され、冠動脈プラークの破綻リスクに応じた新しい治療パラダイムの創出が望まれている。近赤外線自家蛍光法(NIRAF)を用いた血管内イメージングは、不安定プラークの診断に有用であることが報告されているが、不安定プラークが自家蛍光を発するメカニズムや病態的意義は十分に解明されていない。本研究では、不安定プラークに存在する自家蛍光粒子の発生メカニズムと病態的意義を明らかにすることでNIRAFの診断的意義を確立し、自家蛍光の抑制を糸口とした新しいアプローチの動脈硬化治療法の開発を目指す。

Outline of Final Research Achievements

This study explored the mechanism of autofluorescence generation in vulnerable plaque using autofluorescence-generating cells prepared by adding oxidised LDL to cultured macrophages. Autofluorescence-generating macrophages demonstrated lysosomal dysfunction. Autofluorescence was shown to be enhanced by lysosome function inhibitors and attenuated by lysosome activating drugs. The results indicate that autofluorescence in foamy macrophages is due to a disruption of cellular homeostasis associated with lysosomal dysfunction, and that autofluorescence in plaques reflects the localization of necrotic core relating to dysfunctional macrophages that are headed towards cell death.

Academic Significance and Societal Importance of the Research Achievements

不安定プラークの診断法の開発は冠動脈疾患の大きなアンメットニーズである。米国で開発中である血管内分子イメージングデバイスNIRAF-OCTは、不安定プラークから発生する自家蛍光を検出しプラークの脆弱性を診断するというものであり、今後の臨床応用が期待されている。本研究は、不安定プラーク内に存在する泡沫化マクロファージがリソソーム機能不全を起こし細胞死に至る過程で自家蛍光を発生させていることを明らかとした。自家蛍光はプラーク不安定化に重要な壊死性コアの形成を反映していると考えられ、NIRAF-OCTによる自家蛍光検出の診断的意義を確立することができた。

Report

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

    (7 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Coronary Aneurysm after Excimer Laser Catheter Ablation and Plain Balloon Angioplasty for Chronic Total Occlusion in a Patient with Kawasaki Disease2024

    • Author(s)
      Hoyano Makoto、Ozaki Kazuyuki、Kubota Naoki、Yoneyama Shintaro、Okubo Takeshi、Ikegami Ryutaro、Inomata Takayuki
    • Journal Title

      Internal Medicine

      Volume: 63 Issue: 20 Pages: 2801-2806

    • DOI

      10.2169/internalmedicine.3210-23

    • ISSN
      0918-2918, 1349-7235
    • Year and Date
      2024-10-15
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ultrathin-strut versus thin-strut stent healing and outcomes in preclinical and clinical subjects2024

    • Author(s)
      Ikegami Ryutaro、Piao Zhonglie、Iglesias Juan F.、Pilgrim Thomas、Ha Khanh、McCarthy Jason R.、Castellanos Maria I.、Kassab Mohamad B.、Albagdadi Mazen S.、Mauskapf Adam、Spicer Graham、Kandzari David E.、Edelman Elazer R.、Libby Peter、Heg Dik、Joner Michael、Tearney Guillermo J.、Jaffer Farouc A.
    • Journal Title

      EuroIntervention

      Volume: 20 Issue: 10 Pages: e669-e680

    • DOI

      10.4244/eij-d-23-00563

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Efficacy of Proprotein Convertase Subtilisin/Kexin Type 9 Inhibitor Treatment for Repeated In-stent Restenosis in a Coronary Artery2023

    • Author(s)
      Akiyama Takumi、Ozaki Kazuyuki、Takano Toshiki、Yoneyama Shintaro、Kubota Naoki、Okubo Takeshi、Ikegami Ryutaro、Hoyano Makoto、Yanagawa Takao、Inomata Takayuki
    • Journal Title

      Internal Medicine

      Volume: 62 Issue: 22 Pages: 3361-3365

    • DOI

      10.2169/internalmedicine.1609-23

    • ISSN
      0918-2918, 1349-7235
    • Year and Date
      2023-11-15
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Angioscopic Findings of Calcification in Saphenous Vein Graft2023

    • Author(s)
      Yoneyama Shintaro、Kubota Naoki、Ozaki Kazuyuki、Okubo Takeshi、Ikegami Ryutaro、Hoyano Makoto、Inomata Takayuki
    • Journal Title

      Circulation Journal

      Volume: 87 Issue: 11 Pages: 1705

    • DOI

      10.1253/circj.CJ-23-0421

    • ISSN
      1346-9843, 1347-4820
    • Year and Date
      2023-10-25
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Serum Apolipoprotein-A2 Levels are a Stronger Predictor of the Residual Cardiovascular Event Risk After Percutaneous Coronary Intervention2024

    • Author(s)
      秋山琢洋、池上龍太郎、久保田直樹、米山晋太郎、高野俊樹、大久保健志、保屋野真、尾崎和幸、猪又孝元
    • Organizer
      第88回日本循環器学会学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Serum Apolipoprotein-A2 Levels are a Stronger Predictor of the Residual Cardiovascular Event Risk after Percutaneous Coronary Intervention2023

    • Author(s)
      Takumi Akiyama, Ikegami Ryutaro, Naoki Kubota, Toshiki Takano, Shintaro Yoneyama, Takeshi Okubo, Makoto Hoyano, Kazuyuki Ozaki, Takayuki Inomata
    • Organizer
      American Heart Association annual meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Near-Infrared autofluorescence in atherosclerosis generated by oxidized lipid associated with lysosome dysfunction2022

    • Author(s)
      池上龍太郎
    • Organizer
      第87回日本循環器学会学術集会
    • Related Report
      2022 Research-status Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi