実験的な動脈硬化症におけるミネラルコルチコイド受容体アンタゴニズム
Sanjay Rajagopalan1, Damon Duquaine, Steven King
1Department of Internal Medicine, University of Michigan, Ann Arbor, Mich, USA. srajagop@ umich.edu
Circulation
|May 8, 2002
まとめ
セレクティブアルドステロン受容体アンタゴニスト (SARA) は,血管内皮機能を改善し,早期動脈硬化症における酸化ストレスを軽減します. ミネラロコルチコイド受容体 (MR) を阻害すると,抗動脈硬化作用の可能性が示されます.
科学分野:
- 心血管研究 循環器科の研究
- エンドクリノロジー エンドクリノロジー
- 薬理学 薬理学とは
背景:
- アルドステロンは,アンジオテンシンIIの血管作用に作用する.
- ミネラルコルチコイド受容体 (MR) は,血管系で局所的に発現すると仮定されています.
- 初期の動脈硬化には,内皮機能不全が伴う.
研究 の 目的:
- 血管系における局所的なミネラルコルチコイド受容体 (MR) 発現を調査する.
- 選択性アルドステロン受容体アンタゴニスト (SARA) が早期動脈硬化で内皮機能を改善するかどうかを判断する.
主な方法:
- ニュージーランドのウサギは,高コレステロールの食事を与えられ,SARA (エプレレノン) またはプラセボを6週間投与された.
- 評価された超酸化物生成,NADH/NADPH酸化酵素活性,および血管のリラックス反応.
- MR発現を検出するために,リアルタイムの逆転写酵素-ポリメラーゼ連鎖反応を利用した.
主要な成果:
- SARAは,超脂血症ウサギのスーパーオキシド生成の増加と酸化酵素活性低下を正常化させた.
- SARAは,アセチルコリンへの内皮に依存したリラクゼーションを改善し,正常レベルに近づきました.
- ミネラルコルチコイド受容体 (MR) 発現は,高脂血症ウサギの大動脈で検出されました.
結論:
- ミネラロコルチコイド受容体 (MR) 抗は,内皮機能を改善し,食事誘発性動脈硬化症における酸化ストレスを軽減します.
- アルドステロンをその受容体を阻害することによって標的化することは,潜在的抗動脈硬化作用を示しています.
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