Acetylcholine induces Ca-dependent K currents in rabbit endothelial cells.

Acetylcholine induces Ca-dependent K currents in rabbit endothelial cells.
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乙酰胆碱在兔内皮细胞中诱导 Ca 依赖性 K 电流。

DOI:
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发表时间:
1990
期刊:
Japanese Journal of Pharmacology
影响因子:
--
通讯作者:
T. Sakai
T. Sakai
中科院分区:
--
文献类型:
--
作者:
T. Sakai

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用膜片钳技术研究了乙酰胆碱(ACh)对兔主动脉内皮细胞膜电位和电流的影响。ACh使内皮细胞膜超极化。用全细胞电压钳方法,ACh(10(-6)M)诱发一个外向电流,此电流可被阿托品(10(-6)M)阻断。哌仑西平(3 × 10(-7)M)或AF-DX 116(3 × 10(-6)M)对乙酰胆碱诱导的外向电流有轻微的抑制作用,同时应用这两种阻断剂可明显抑制外向电流。应用咖啡因(2 × 10(-2)M)、兰尼碱(10(-5)M)或肝素(10(-5)g/ml)可降低乙酰胆碱诱导的外向电流的幅度。用膜片钳技术记录的单通道电流显示,ACh打开一个Ca依赖性的K通道,单通道电流电导为9 pS。这些结果表明,M1和M2受体亚型存在于兔主动脉内皮细胞和ACh激活钙依赖性K通道通过释放钙从细胞内存储网站。此外,亚甲蓝抑制乙酰胆碱诱导的外膜外向电流。
Effects of acetylcholine (ACh) on the membrane potential and current recorded from endothelial cells dispersed from the rabbit aorta were investigated using the patch-clamp technique. ACh hyperpolarized the endothelial cell membrane. Using the whole-cell voltage-clamp procedure, ACh (10(-6) M) induced an outward current, and this current was blocked by atropine (10(-6) M). Application of either pirenzepine (3 x 10(-7) M) or AF-DX 116 (3 x 10(-6) M) slightly inhibited the ACh-induced outward current, and simultaneous application of these two blockers markedly inhibited the outward current. Application of caffeine (2 x 10(-2) M), ryanodine (10(-5) M) or heparin (10(-5) g/ml) reduced the amplitude of the ACh-induced outward current. A single-channel current recording using the patch-clamp technique revealed that ACh opens a Ca-dependent K-channel with a single-channel current conductance of 9 pS. These results indicate that both M1 and M2 receptor subtypes are present in endothelial cells of the rabbit aorta and that ACh activates the Ca-dependent K channel via release of Ca from intracellular store sites. In addition, methylene blue inhibited the ACh-induced outward current from the outside membrane.
DOI: --
发表时间: 1985-03
期刊: The Journal of pharmacology and experimental therapeutics
影响因子: --
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DOI: 10.1152/ajpcell.1987.253.3.c364
发表时间: 1987-09-01
影响因子: --
作者:
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通讯作者: MEISSNER, G
DOI: 10.1172/jci112536
发表时间: 1986-07-01
影响因子: 15.9
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MURAD, F
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DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Snyder,SH
肝素抑制血管平滑肌中鸟嘌呤核苷酸诱导的肌醇 1,4,5-三磷酸依赖性钙释放,但不抑制独立钙释放。
DOI: 10.1016/s0006-291x(88)81141-0
发表时间: 1988
影响因子: 3.1
作者:
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通讯作者: Somlyo,AP