An ATP, calcium and voltage sensitive potassium channel in porcine coronary artery smooth muscle cells.

An ATP, calcium and voltage sensitive potassium channel in porcine coronary artery smooth muscle cells.
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猪冠状动脉平滑肌细胞中的 ATP、钙和电压敏感钾通道。

DOI:
10.1016/0006-291x(90)90703-p
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发表时间:
1990
影响因子:
3.1
通讯作者:
vanBreemen,C
vanBreemen,C
中科院分区:
生物学4区
文献类型:
--
作者:
Silberberg,SD;vanBreemen,C

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人们对平滑肌钾通道在防止缺血和缺氧损伤中所起的作用越来越感兴趣。因此,使用膜片钳技术的由内而外的变体在新鲜分散的猪冠状动脉平滑肌细胞中研究钾选择性通道。最丰富的钾通道在 5.4×140 mM K+ 梯度、0 mV 下的电导为 148 pS,并受细胞质 ATP (0.05–3.0 mM)、细胞质 Ca 2+ (0.1–10 μM) 和电压调节。 ATP 和 AMP-PNP (0.5 mM) 分别使通道打开的概率 (P 0) 降低了 87% 和 92%。添加 0.5 mM ADP 可以部分逆转这种抑制作用。 ADP 本身 (2 mM) 可使 P 0 降低 46%。因此,该通道似乎与 ATP 敏感通道和钙调节钾通道具有相同的特性,这增加了它在冠状动脉血流调节中发挥核心作用的可能性。
There is increasing interest in the roles played by potassium channels of smooth muscle in protecting against ischemic and anoxic insults. Hence, potassium-selective channels were studied in freshly dispersed porcine coronary artery smooth muscle cells using the inside-out variant of the patch-clamp technique. The most abundant potassium channel had a conductance of 148 pS in a 5.4 140 mM K+ gradient, at 0 mV, and was regulated by cytoplasmic ATP (0.05–3.0 mM), cytoplasmic Ca 2+(0.1–10 μM) and voltage. ATP and AMP-PNP (0.5 mM) reduced the probability of channel opening (P 0) by 87 and 92%, respectively. This inhibition was partially reversed by the addition of 0.5 mM ADP. ADP on its own (2 mM) reduced P 0 by 46%. It appears, therefore, that this channel shares properties with both the ATP-sensitive and the calcium-regulated potassium channels, raising the possibility that it plays a central role in the regulation of coronary blood flow.
Ca2+激活的K+通道及其在豚鼠taenia大肠杆菌平滑肌细胞中的功能作用。
DOI: 10.1085/jgp.94.5.833
发表时间: 1989-11
期刊: The Journal of general physiology
影响因子: --
作者:
Hu SL;Yamamoto Y;Kao CY
通讯作者: Kao CY
DOI: 10.1038/316736a0
发表时间: 1985
期刊: Nature
影响因子: 64.8
作者:
A. Spruce;N. Standen;P. Stanfield
通讯作者: P. Stanfield
DOI: 10.1016/0014-5793(86)81533-2
发表时间: 1986-11-10
期刊: FEBS LETTERS
影响因子: 3.5
作者:
KAKEI, M;KELLY, RP;ASHCROFT, FM
通讯作者: ASHCROFT, FM
DOI: 10.1016/0014-5793(86)81532-0
发表时间: 1986-11-10
期刊: FEBS LETTERS
影响因子: 3.5
作者:
DUNNE, MJ;PETERSEN, OH
通讯作者: PETERSEN, OH
DOI: 10.1016/0304-4165(87)90102-4
发表时间: 1987-08-13
期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
作者:
HARRISON, SM;BERS, DM
通讯作者: BERS, DM