Mechanisms of coronary artery depolarization by uridine triphosphate.

Mechanisms of coronary artery depolarization by uridine triphosphate.
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三磷酸尿苷的冠状动脉去极化机制。

DOI:
10.1152/ajpheart.2001.280.6.h2545
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发表时间:
2001
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
--
通讯作者:
Brayden,JE
Brayden,JE
中科院分区:
--
文献类型:
--
作者:
Welsh,DG;Brayden,JE

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我们试图确定嘧啶核苷酸收缩大鼠冠状动脉阻力动脉的基本机制。三磷酸尿苷(UTP)引起内皮剥离的冠状动脉出现剂量依赖性收缩。 UTP 还能去极化并增加冠状动脉平滑肌细胞中的胞质 Ca2+。 Nisoldipine 是一种电压驱动的 Ca2+ 通道拮抗剂,可阻止胞质 Ca2+ 的升高,并将 UTP 诱导的血管收缩减少约 75%,这表明去极化在这种收缩反应中发挥着重要作用。随后利用全细胞膜片钳电生理学在冠状动脉平滑肌细胞中探索了 UTP 诱导的去极化的离子基础。在没有 K+ 且移液器中有 CsCl 的情况下,UTP (40 μM) 激活持续的内向整流电流(-60 mV 时为 -0.66 ± 0.10 pA/pF)。浴中 Na+ 减少 100 mM 会改变该电流的反转电位(从 -2 ± 1 到 -28 ± 4 mV)并降低幅度(从 -2.26 ± 0.61 到 -0.51 ± 0.11 pA/pF)。除了激活去极化阳离子电流外,UTP 还能抑制超极化外向电流。具体来说,UTP 抑制 ATP 敏感和电压依赖性 K+ 电流,但对内向整流和 Ca2+ 激活的 K+ 通道没有影响。这项研究表明,机电耦合对于嘧啶诱导的冠状动脉阻力动脉收缩是不可或缺的。
We sought to define the basic mechanisms by which pyrimidine nucleotides constrict rat coronary resistance arteries. Uridine triphosphate (UTP) caused a dose-dependent constriction in coronary arteries stripped of endothelium. UTP also depolarized and increased cytosolic Ca2+in coronary smooth muscle cells. Nisoldipine, an antagonist of voltage-operated Ca2+channels, blocked the rise in cytosolic Ca2+and reduced UTP-induced vasoconstriction by ∼75% which suggests a prominent role for depolarization in this constrictor response. The ionic basis of UTP-induced depolarization was subsequently explored in coronary smooth muscle cells using whole-cell patch-clamp electrophysiology. In the absence of K+and with CsCl in the pipette, UTP (40 μM) activated a sustained inwardly rectifying current (−0.66 ± 0.10 pA/pF at −60 mV). A 100 mM reduction in bath Na+shifted the reversal potential of this current (from −2 ± 1 to −28 ± 4 mV) and reduced the magnitude (from −2.26 ± 0.61 to −0.51 ± 0.11 pA/pF). In addition to activating a depolarizing cation current, UTP inhibited hyperpolarizing outward currents. Specifically, UTP inhibited ATP-sensitive and voltage-dependent K+currents yet had no effect on inwardly rectifying and Ca2+-activated K+channels. This study indicates that electromechanical coupling is integral to pyrimidine-induced constriction in coronary resistance arteries.
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影响因子: --
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