Anion modulation of calcium current voltage dependence and amplitude in salamander rods.

Anion modulation of calcium current voltage dependence and amplitude in salamander rods.
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蝾螈杆中钙电流电压依赖性和振幅的阴离子调制。

DOI:
10.1016/s0005-2736(99)00257-6
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发表时间:
2000
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Stella,SL
Stella,SL
中科院分区:
--
文献类型:
--
作者:
Thoreson,WB;Stella,SL

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用Hofmeist型阴离子研究了氯离子−置换对视杆细胞光感受器L钙电流的抑制和超极化激活漂移的作用。对IC的抑制基本上遵循Hofmeister序列:CL−=BR−<no−3<I−<Clo−4(Clo−4抑制最大)。阴离子诱导的超极化激活位移也遵循霍夫迈斯特序列:CL−<BR−<NO−3<I−<ClO−4(ClO−4引起最大的位移)。与Hofmeister序列的一致表明,这些效应是由于膜表面的阴离子相互作用造成的。Hofmeister阴离子在内向整流型阳离子电流(Ih)和外向型K+电流(Ik)的电压依赖性上也引起了类似的超极化漂移,这与阴离子对膜表面电位的影响引起超极化漂移的假设一致。硫酸盐和磷酸盐抑制了杆状ICA,磷酸盐引起明显的活化左移,表明这些阴离子被强烈吸附在膜上。由于生理电压范围和ICa激活曲线下部的重叠,负离子对幅度和激活的影响可能影响第一视网膜突触的突触传递。
Hofmeister anions were used to investigate the ability of Cl−replacement to produce inhibition and a hyperpolarizing activation shift in L-type Ca2+currents (ICa) of rod photoreceptors. Inhibition of ICalargely followed the Hofmeister sequence: Cl−=Br−<NO−3<I−<ClO−4(ClO−4caused the greatest suppression). Anion-induced hyperpolarizing activation shifts also followed the Hofmeister sequence: Cl−<Br−<NO−3<I−<ClO−4(ClO−4caused the largest shift). Agreement with the Hofmeister sequence suggests that these effects are due to anion interactions at the membrane surface. Hofmeister anions also caused similar hyperpolarizing shifts in the voltage dependence of inwardly rectifying cation currents (Ih) and outward K+currents (IK) consistent with the hypothesis that hyperpolarizing shifts arise from anion effects on membrane surface potential. Sulfate and phosphate inhibited rod ICaand phosphate caused a significant leftward activation shift suggesting these anions are strongly adsorbed to the membrane. Because of the overlap between the physiological voltage range and the lower part of the ICaactivation curve, anion effects on amplitude and activation may influence synaptic transmission at the first retinal synapse.
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