閉塞性心不全における内皮酸化窒素合成酵素解離の機能的影響
Lana J Dixon1, David R Morgan, Sinead M Hughes
1Department of Therapeutics and Pharmacology, Queen's University Belfast, 97 Lisburn Rd, Belfast BT9 7BL, Northern Ireland.
Circulation
|April 1, 2003
まとめ
血小板内皮酸化窒素合成酶 (eNOS) の解離は,閉塞性心不全 (CCF) で発生し,血管の拡張を阻害し,酸化窒素 (NO) の生成を減少させます. この機能障害は,CCF患者の心血管合併症に寄与する.
科学分野:
- 心血管研究 循環器科の研究
- バイオケミストリー バイオケミストリー
- 生理学 生理学とは
背景:
- 閉塞性心不全 (CCF) は,内皮媒介性血管拡張 (EMVD) の障害と関連しています.
- 超酸化物 (O2*-) と内皮の酸化窒素合成酵素 (eNOS) の解離との相互作用による酸化窒素 (NO) の生物利用性の低下は,CCFに関連しています.
- eNOSの解離は,NO.の代わりにO2*-の生成につながります.
研究 の 目的:
- CCF患者におけるeNOS解離の機能的影響を調査する.
- 血小板におけるO2*-およびNOの生成をex-vivoモデルとして調査する.
- CCFにおけるeNOS解離と血管拡張器応答の障害を相関させるため.
主な方法:
- O2*-とNO生産を評価するために,区画化されたex-vivoモデルとして使用された血小板.
- eNOS活性とO2*-生成を評価するために,Nomega-Nitro-L-Arginineメチルエステル (L-NAME) を投与しました.
- 静脈閉塞プレシスモグラフィーを用いて,エンドセリウム依存および独立の血管拡張反応を測定した.
主要な成果:
- 18人のCCF患者のうち9人のeNOS解離が特定され,L-NAME投与時にO2*-の生産が減少したことが証明されました.
- 血小板由来のNOの生成は,eNOSと結合されたグループと比較して,eNOSと結合されていないCCF群で有意に低かった.
- eNOS解離を受けた患者は,内皮依存および内皮依存の血管拡張反応が著しく低下した.
結論:
- この研究は,ヒトCCFにおける血小板eNOS解離の最初の証拠を示しています.
- CCFにおけるeNOSの解離は,血小板のNO生成の減少と関連しています.
- CCF患者における血管拡張機能障害は,eNOS酵素解離と相関しています.
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