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
复制标题
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:
影响因子:
--
通讯作者:
R. Weingart
中科院分区:
文献类型:
--
作者:
A. Rüdisüli;R. Weingart
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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DOI:
10.1152/ajpheart.1988.254.1.h170
发表时间:
1988
期刊:
The American journal of physiology
影响因子:
--
作者:
Veenstra,RD;DeHaan,RL
通讯作者:
DeHaan,RL
DOI:
10.1126/science.2426781
发表时间:
1986
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Veenstra,RD;DeHaan,RL
通讯作者:
DeHaan,RL
DOI:
10.1073/pnas.84.14.4901
发表时间:
1987
影响因子:
11.1
作者:
Meda,P;Bruzzone,R;Chanson,M;Bosco,D;Orci,L
通讯作者:
Orci,L
DOI:
10.1073/pnas.83.15.5494
发表时间:
1986
影响因子:
11.1
作者:
Spray,DC;Saez,JC;Brosius,D;Bennett,MV;Hertzberg,EL
通讯作者:
Hertzberg,EL