uPAR欠乏がTGFβ1媒介の線維性改造を誘発し,心周血管状の微環境を形成する
Yulia Goltseva1, Zoya Tsokolaeva2,3, Irina Beloglazova2
1National Medical Research Centre of Cardiology named after academician E.I. Chazov, Moscow, 121552, Russian Federation. YDgoltseva@cardio.ru.
Stem cell research & therapy
|February 14, 2026
まとめ
ウロキナーゼプラズミノゲンアクティベーター受容体 (uPAR) の喪失は,周周微環境を混乱させ,TGFβ1信号伝達を増幅することによって,心筋線維症を悪化させます. これは,PARを線維性心疾患の潜在的な治療標的として強調しています.
科学分野:
- 心血管生物学 心血管生物学
- 線維症の研究 線維症の研究
- 病気の分子メカニズム
背景:
- 心筋線維症は,内皮機能不全と血管周微環境損傷に関連した主要な健康問題です.
- ウロキナーゼプラズミノゲンアクティベーター受容体 (uPAR) は血管再構成と線維症において重要な役割を果たしますが,心臓線維症のメカニズムにおけるその役割は不明です.
- この研究では,心血管周微環境の繊維性改造におけるUPARの役割を調査しています.
研究 の 目的:
- uPAR欠乏が心周血管微環境における線維性改造に寄与するメカニズムを解明する.
- 心臓細胞におけるUPAR発現の特徴と,プロフィブロティックシグナル伝達への影響について.
主な方法:
- マウスハートにおけるUPAR発現をマッピングするために,単細胞RNA配列と免疫光染色を行う.
- 心球体 (CSs) とCRISPR/Cas9で生成されたプラウールのノックアウト線維芽細胞 (FBs) を用いた実験室内モデリング.
- TGFβ1の刺激により,プロファイブロティック活性化が誘発され,その後,ウェスタン・ブロッティングによるECMの堆積,細胞の変容,およびセクレトームのプロファイリングの分析が行われます.
主要な成果:
- uPARは,心周血管ニッチの内皮細胞 (ECs) とFBsによって発現します.
- CSのUPAR欠乏は,活性TGFβ1の増加,インテグリン機能の低下,および秘密体の変化をもたらし,ECMの堆積を促進し,ECの生存能力を低下させた.
- プラウルのノックアウトFBでは,TGFβ1媒介のAktシグナル伝達とECMの堆積が強化され,UPARの役割が確認されました.
結論:
- uPAR欠乏症は,心血管周微環境の線維性改造を誘発する.
- uPARの喪失は,TGFβ1媒介の線維性反応を悪化させる.
- uPARは心臓線維症を緩和する潜在的な治療目標として浮上しています.
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