Electrical properties of gap junction channels in guinea-pig ventricular cell pairs revealed by exposure to heptanol

Electrical properties of gap junction channels in guinea-pig ventricular cell pairs revealed by exposure to heptanol
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接触庚醇揭示豚鼠心室细胞对间隙连接通道的电特性

DOI:
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发表时间:
1989
期刊:
Pflügers Archiv
影响因子:
--
通讯作者:
R. Weingart
R. Weingart
中科院分区:
--
文献类型:
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作者:
A. Rüdisüli;R. Weingart

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从成年豚鼠脑室中分离细胞对,研究间隙连接通道的电学特性。实验包括双电压钳法和全细胞密闭式记录。庚醇以剂量依赖的方式降低细胞内电流In。在完全解耦之前,In显示波动,提示门控通道的操作。在3 mM庚醇存在下,In表现出由单通道自发打开和关闭引起的量子步骤。通道的iv -关系为线性关系(范围为±95 mV)。对电流记录的分析表明,单通道电导γn:平均值= 37 pS;γ - n对非结膜电位不敏感(范围:−90 ~ +10 mV)。移液液中3mm的ATP4−对γ - n没有影响,6mm的ATP4−对γ - n的影响较小,6mm的ATP+0.1 mM的cAMP−对γ - n的影响较大。通道从闭合状态到打开状态的转变是可变的(视时间常数范围:2.5-32 ms,平均值:11 ms)。
Cell pairs were isolated from adult guinea pig ventricles to study the electrical properties of gap junction channels. The experiments involved a double voltage-clamp approach and whole-cell, tight-seal recording. Heptanol decreased the intracellular current, In, in a dose-dependent fashion. Before complete uncoupling, In showed fluctuations suggesting the operation of gated channels. In the presence of 3 mM heptanol, In showed quantal steps arising from spontaneous opening and closing of single channels. The IV-relationship of the channels was linear (range: ±95 mV). Analysis of current records revealed the following singlechannel conductances, γn: Mean value = 37 pS; median value = 33 pS. γn was insensitive to the non-junctional membrane potential (range: −90 to +10 mV). 3 mM ATP4− in the pipette solution had no effects on γn, 6 mM ATP4− produced a small decrease, and 6 mM ATP+0.1 mM cAMP− an increase in γn. Channel transitions from closed to open state were variable (range of apparent time constants: 2.5–32 ms; mean: 11 ms).
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影响因子: --
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