Endothelin activation of an inwardly rectifying K+ current in atrial cells.

Endothelin activation of an inwardly rectifying K+ current in atrial cells.
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内皮素激活心房细胞内向整流 K 电流。

DOI:
10.1161/01.res.69.1.250
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发表时间:
1991
影响因子:
20.1
通讯作者:
Kim,D
Kim,D
中科院分区:
医学1区
文献类型:
--
作者:
Kim,D

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包括心脏在内的各种组织表达内皮素的特异性结合位点。据报道,内皮素可能通过特定受体来增加心肌的收缩力。内皮素与心房组织的特异性结合特别高。在本研究中使用的自发收缩的大鼠心房细胞中,内皮素的所有三种亚型(内皮素-1、内皮素-2 和内皮素-3)均降低了搏动速率,并导致电压钳位的全细胞内向整流 K+ 电流增加。 Endothelin-3 是最有效的异构体,其对搏动速率和 K+ 电流的影响在低至 100 pM(Kd,约 1 nM)的浓度下就存在。心房细胞没有超极化激活电流(起搏器电流)If。在切除的由内而外的斑块中,内皮素的所有三种亚型均激活了一组 K+ 通道,其动力学特性与乙酰胆碱(毒蕈碱)激活的 K+ 通道相同,并且这是 GTP 依赖性的。内皮素未能降低经百日咳毒素处理的细胞的搏动速率或引发 K+ 电流。这些结果表明,内皮素通过激活内向整流毒蕈碱 K+ 通道而具有有效的负变时作用,因此可能是心脏功能的重要调节剂。
Various tissues including heart express specific binding sites for endothelin. Endothelins have been reported to increase the force of contraction of cardiac muscle, presumably via specific receptors. Specific binding of endothelin to atrial tissue is particularly high. In spontaneously contracting rat atrial cells used in this study, all three isoforms of endothelin (endothelin-1, endothelin-2, and endothelin-3) decreased the rate of beating and caused an increase in inwardly rectifying K+ current in voltage-clamped whole cells. Endothelin-3 was the most potent isoform, and its effects on beating rate and K+ current were present at a concentration as low as 100 pM (Kd, approximately 1 nM). the atrial cells did not have the hyperpolarization-activated current (the pacemaker current), If. In excised inside-out patches, all three isoforms of endothelin activated a population of K+ channels with kinetic properties identical to those of acetylcholine (muscarinic)-activated K+ channels, and this was GTP dependent. Endothelin failed to decrease the beating rate or to elicit the K+ current in pertussis toxin-treated cells. These results indicate that endothelin has a potent negatively chronotropic effect by activation of the inwardly rectifying, muscarinic K+ channel and therefore could be an important regulator of heart function.
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