ロサルタンは高血圧のヒトにおけるブラジキニンのレベルを上昇させる
Duncan J Campbell1, Henry Krum, Murray D Esler
1St Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, Victoria 3065, Australia. dcampbell@svi.edu.au
Circulation
|January 19, 2005
まとめ
ロサルタンなどのアニオテンシン1型受容体阻害剤は,高血圧患者のブラジキニンのレベルを上昇させます. これは,それらの治療効果と血管腫のような副作用に寄与する可能性があります.
科学分野:
- 心血管薬理学について
- 高血圧の研究 高血圧の研究
- 腎臓生理学 腎臓生理学
背景:
- アンジオテンシン1型 (AT1) 受容体ブロッカーは高血圧の治療に使用されます.
- 動物とヒトの研究は,キニンがAT1受容体ブロッカー作用に作用することを示唆しています.
- AT1受容体ブロッカーのヒトキニンレベルへの影響は不明である.
研究 の 目的:
- 精性高血圧を有するヒトにおけるキニンおよびアンジオテンシンペプチドレベルに対するロサルタンおよびエプロサルタンの影響を調査する.
- AT1受容体ブロッカーの誘発によるペプチドプロファイルの変化の背後にある潜在的なメカニズムを探求する.
主な方法:
- ダブルブラインド,3期,3治療のクロスオーバー試験で,エッセンシャル高血圧の患者を対象とした.
- プラセボ,ロサルタン (50 mg OD),エプロサルタン (600 mg OD) の投与.
- 動脈血中のアンジオテンシン (Ang),ブラジキニン (BK),カリディンペプチドの測定 HPLCベースの放射性免疫測定を用いて.
主要な成果:
- ロサルタンは血中のブラジキニン (BK) 濃度 (二倍) を著しく増加させ,BK-1-7/BK-1-9比を55%減少させた.
- エプロサルタンは,ブラジキニンのレベルの変化に類似する傾向を示したが,カリディンのレベルは変化しなかった.
- 両薬ともAng I,Ang II,Ang−2-8) を増加させ,エプロサタンもAng−3−8) を増加させた.
- Ang-II/Ang IおよびAng-{1-7) /Ang I比の有意な減少が観察されたが,血のACE活性には影響はなかった.
結論:
- ロサルタンは,高血圧患者のブラジキニンのレベルを明らかに増加させる.
- ACEと中性エンドペプチダースによる代謝の低下は,おそらくブラジキニンの上昇に寄与する.
- ブラジキニンの増加は,AT1受容体阻害剤のクラス効果であり,治療作用を媒介し,潜在的に血管腫の副作用を引き起こす可能性があります.
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