圧力誘発マトリックスメタルプロテインアゼ-9は,早期高血圧の再構築に寄与する
Stéphanie Lehoux1, Catherine A Lemarié, Bruno Esposito
1INSERM U541, Hôpital Lariboisière, 41 boulevard de la Chapelle, 75010 Paris, France. lehoux@larib.inserm.fr
Circulation
|February 18, 2004
まとめ
高血圧は,マトリックス金属タンパク質酵素 (MMPs) を活性化することによって,血管構造を変化させます. MMP-9は,早期の高血圧性血管改造と血管の伸縮性に不可欠です.
科学分野:
- 心血管生物学 心血管生物学
- 血管再建 (Remodeling) について
- 細胞外マトリックスダイナミクス
背景:
- 高血圧は,細胞外マトリックス組成の変化を含む,血管壁の構造的変化を引き起こす.
- これらの高血圧性血管変化の背後にある正確なメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- 血管壁の高圧に対する血管壁の反応におけるマトリックス金属タンパク質酵素 (MMPs) の役割を調査する.
- MMP-2とMMP-9の圧力誘発性血管改造に対する特定の貢献を解明する.
主な方法:
- マウスの頸動脈の臓器培養は,異なる内圧 (10,80,150mmHg) の下で行われました.
- ジェラチンジモグラフィーと免疫ヒストケミストリーは,MMP-2とMMP-9の活性と局所性を評価する.
- 血管の伸縮性を評価するために圧力-直径関係の測定.
- MMP-9欠乏性マウスを用いた研究とMMP-9の薬理学的阻害.
主要な成果:
- 高圧 (150 mm Hg) は,大動脈におけるMMP-2とMMP-9の活性を著しく増加させた.
- 高圧は,より大きな血管拡張性を誘発し,これはMMPの活性化と関連しており,MMPの阻害によって防止されました.
- MMP-9欠乏したマウスは,MMP-2の活性が維持されているにもかかわらず,圧力の誘発による縮性がなくなりました.
結論:
- マトリックスメタルプロテインアース-9 (MMP-9) は,高血圧性血管改造の初期段階において重要な役割を果たします.
- MMP-9は,高血圧への反応として観察される血管張りの圧力依存の増加に不可欠です.
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