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心筋梗塞における誘導性酸化窒素合成酵素の選択的調節
S M Wildhirt1, H Suzuki, D Horstman
1Department of Cardiac Surgery, Ludwig-Maximilians University, Munich, Germany. wildhirt@hch.med.uni-muenchen.de
Circulation
|October 7, 1997
まとめ
SMTによる誘導性酸化窒素合成酵素 (iNOS) の選択的阻害により,心筋梗塞後の心臓機能と血流が改善される. これは,iNOSが心臓発作後の心臓機能不全に寄与することを示唆しています.
科学分野:
- 心血管科学 心血管科学
- 薬理学 薬理学とは
- バイオケミストリー バイオケミストリー
背景:
- 誘導性酸化窒素合成酵素 (iNOS) は,心臓疾患で活性化されます.
- iNOSの増加した活動は,心筋梗塞後の左心室機能不全に寄与する可能性があります.
研究 の 目的:
- 心筋梗塞後の左心室機能不全における iNOS活性の増加の役割を調査する.
- 選択的なiNOS阻害が心臓の機能と血流に与える影響を評価する.
主な方法:
- ニュージーランドのウサギのオスは心筋梗塞を患った.
- 動物は塩水,S-メチルイソチオウレア硫酸塩 (SMT) (選択的なiNOS阻害剤),またはN-オメガ) -ニトロ-L-アルギニン (L-NNA) (非選択的なiNOS阻害剤) を投与した.
- 測定には,NOS活性,血NOx,cGMP,血動力学,および様々な時間点における心筋血流が含まれていました.
主要な成果:
- 心筋梗塞は,iNOSの活動,心臓のNOxの生成,およびcGMPのレベルが上昇したが,cNOSは変化しなかった.
- 発作により左心室機能が低下 (LVEDP増加,dP/dt減少) し,心筋血流が低下した.
- SMTは選択的にiNOSを阻害し,左心室の機能を改善し,心筋血流を増加させ,L-NNAはより広範な阻害効果を持ち,アウトカムを悪化させた.
結論:
- インパクト後の誘発されたiNOS活動は,マイナスのイノトロピー効果を発揮し,心筋機能不全に貢献します.
- SMTによる選択的なiNOS阻害は,心臓のパフォーマンスと心筋の血流を改善します.
- iNOSの活動をターゲットにすることは,急性心筋梗塞の有益な治療戦略である可能性があります.
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