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人間の冠動脈血管運動制御における内生ブラジキニンの役割
Circulation
|December 15, 1995
まとめ
固有のブラジキニンは,正常な条件下でヒトの冠動脈の直径と血流の調節に重要な役割を果たします. ブラジキニンB2受容体を遮断すると,流量依存の膨張が著しく減少し,血管運動制御におけるその重要性を強調します.
科学分野:
- 心血管生理学 心血管の生理学
- 薬理学 薬理学とは
背景:
- ブラジキニンはB2受容体を通して作用する血管拡張剤であり,酸化窒素とプロスタサイクリンの放出に影響を与えます.
- 人間の冠動脈動脈制御におけるその役割は,以前は調査されていなかった.
研究 の 目的:
- 人間の冠動脈循環における血管運動制御に対する内在的なブラジキニンの貢献を調査する.
主な方法:
- 選択的なブラジキニンB2受容体アンタゴニスト (HOE 140) を左主冠動脈に15人の患者で投与した.
- 定量的な血流とドップラー線を用いて,心臓の冠動脈反応を評価した.
- HOE140前後に評価されたフロー依存の膨張とアセチルコリン反応.
主要な成果:
- HOE 140は,重要な血管収縮を引き起こし,血管抵抗を増加させながら,光の領域と冠動脈の血流を減少させました.
- ブラジキニンB2受容体阻害後の流量依存の膨張は23.4%から3.9%に減少した.
- アセチルコリン誘発反応は変化せず,ブラジキニンの特定の関与を示唆した.
結論:
- この研究は,ヒトの冠動脈血管運動の調節における内生性ブラジキニンの役割に関する最初の証拠を提供します.
- ブラディキニンは,ベースおよびフロー刺激条件下で,抵抗および上心冠動脈の両方の正常な血管運動反応に不可欠です.
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