心筋梗塞患者の循環中の微粒子は,内皮機能不全を引き起こします.
C M Boulanger1, A Scoazec, T Ebrahimian
1INSERM U541, IFR-Circulation, Service de Cardiologie, Hôpital Lariboisière, Paris, France. cboulang@infobiogen.fr
Circulation
|November 28, 2001
まとめ
心筋梗塞 (MI) の患者からの微粒子は,酸化窒素経路に影響することによって,血管機能を損なう. これらの循環する微粒子は,心筋梗塞後の血管運動機能不全を説明する可能性がある.
科学分野:
- 心血管生物学 心血管生物学
- 内皮機能の機能について
- マイクロ粒子生物学
背景:
- 循環膜微粒子は,非発血性および心筋梗塞 (MI) の両方の患者に存在します.
- これらの微粒子が内皮に依存する反応に与える影響は,まだ完全に解明されていない.
研究 の 目的:
- 心臓発作患者の循環中の微粒子が,内皮に依存する血管応答に及ぼす影響を調査する.
- 非発血性 (NI) 患者からの微粒子が同様の効果を持っているかどうかを判断するために.
主な方法:
- ネズミの大動脈の環は,無傷の内皮とNIおよびMI患者のマイクロ粒子をインキュベートしました.
- アセチルコリンとイオノミシンの内皮に依存したリラクゼーションを測定した.
- また,エンドセリウム独立のリラクゼーションとエンドセリウム酸化窒素合成酵素 (eNOS) 発現も評価した.
主要な成果:
- MI患者の微粒子は,アセチルコリンとイオノミシンに対する内皮に依存したリラクゼーションを著しく低下させた.
- NI患者からのマイクロ粒子は,これらのリラックスに影響を与えませんでした.
- この障害は酸化窒素経路と関連しており,抗炎症剤やスーパーオキシードディスミュータゼ模倣剤の影響を受けなかった.
結論:
- MI患者の循環中の微粒子は,内皮の酸化窒素 (NO) 伝導経路を選択的に損なう.
- これらの微粒子は,MI後の患者で観察される血管運動機能障害に寄与する可能性があります.
- この機能不全は,大きな阻害のない動脈でも起こり得る.
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