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乙醇对心脏乙酰胆硷激活的钾通道的作用 被引量:6

The effects of ethanol on acetylcholine activated potassium current of the heart
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摘要 乙醇是心脏抑制剂 ,有明显的降低心肌收缩的作用。神经递质乙酰胆硷 (ACh)调节心脏功能的最重要的离子通道是经鸟苷酸调节蛋白 (G蛋白 )的 βγ亚单位而激活的毒蕈碱型钾通道 (IK,ACh)。作者采用全细胞膜片钳的方法观察了豚鼠心房肌细胞乙酰胆硷激活的钾通道及乙醇对其影响。乙醇对 IK,ACh的抑制呈剂量依赖性效应 ,灌注之后可使 ACh激活的 IK,ACh速率减慢 ,峰值下降。乙醇可抑制 IK,ACh,从而影响副交感神经对心脏的调节作用。 Ethanol is a cardiac depress and it can inhibit the contraction of cardiac muscles. Acetylcholine (ACh) released from parasympathetic nerves binds to muscarinic (M 2) ACh receptor (mAChR) in the heart and this leads to the activation of muscarinic K + channel via the βγ subunit of a G protein. The muscarinic K + channel (I K,ACh ) in guinea pig atrial cells and the effect of an alcohol (ethanol) on I K,ACh were investigated using the whole cell patch clamp technique. Ethanol depressed I K,ACh in a dosedependent manner and ethanol slowed activation of I K,ACh and reduced peak I K,ACh . The decrease of I K,ACh by ethanol may impair parasympathetic control of the heart.
出处 《心脏杂志》 CAS 2000年第1期1-3,共3页 Chinese Heart Journal
基金 国家自然科学基金!( No.3 9870 3 3 4 ) 国家教委留学回国人员启动基金 世川医学奖学金同学会科研启动基金!( No.0 2 5 )资助项目
关键词 乙醇 心脏 离子通道 乙酰胆硷 alcohol, ethyl heart ion channels acetylcholine
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参考文献12

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同被引文献58

  • 1陈炳伟,李玉明.酒精对心血管系统离子通道的影响[J].心血管病学进展,2005,26(B08):24-26. 被引量:6
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