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Gタンパク質に誘発されたカリウム電流I ((K,ACh) は,慢性心房細動患者において構成的に活性である

D Dobrev¹, A Friedrich, N Voigt

¹Department of Pharmacology and Toxicology, Medical Faculty, Dresden University of Technology, Dresden, Germany. dobrev@rcs.urz.tu-dresden.de

|December 7, 2005

まとめ

動脈動では,構成的に活性なアセチルコリン活性化カリウム電流 (I(K,ACh)) が,基礎内向整流器電流 (IK1) の増加に寄与する. このI ((K,ACh) をブロックすることは,心房細動に対する新しい治療戦略を提供することができる.

科学分野:

心臓病学心臓病学
電気生理学電気生理学
分子生物学は分子生物学である.

背景:

atrial fibrillation (AF) の背景内向直線電流 (IK1) の増加の基礎となる分子メカニズムは不明のままである.
本研究では,慢性AF (cAF) で観察される基礎伝導性の強化における構成的に活性なアセチルコリン (ACh) 活性化I(K,ACh) の潜在的な役割を調査しています.

研究の目的:

構成的に活性なアセチルコリン (ACh) 活性化されたI(K,ACh) が,慢性心房動 (cAF) の基礎伝導率の強化に寄与するかどうかを決定する.

主な方法:

全細胞および単一チャネルの電流は,シヌスリズム (SR) とcAFを有する患者の心房筋細胞で,電圧クラップ技術を使用して測定されました.
選択的I ((K,ACh) 阻害剤であるテルティアピンは,その抑制効果を評価するために使用されました.

主要な成果:

基礎全細胞電流は,SRと比較して,cAFにおいて有意に大きかった.
テルチアピンは,SRよりも,caFにおけるI,K,AChを阻害するより大きな効能を示し,caFにおけるターチアピンに敏感な基礎電流成分が大きいことを示した.
シングルチャネルの記録では,cAFにおける有力な構成活性I (K,ACh) が明らかになり,チャネル開く確率は増加した.

結論:

cAFにおけるベース・インバード・リクティファーのK+電流の増加は,増強されたIK1活動と構成的に活発なI (K,ACh) に起因する.
I(K,ACh) 阻害を標的とした治療は,心房動の管理に新たな治療アプローチを提示する可能性がある.

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