Transient sodium current at subthreshold voltages: activation by EPSP waveforms.

Transient sodium current at subthreshold voltages: activation by EPSP waveforms.
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亚阈值电压处的瞬态钠电流:EPSP波形激活。

DOI:
10.1016/j.neuron.2012.08.033
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发表时间:
2012-09-20
期刊:
影响因子:
16.2
通讯作者:
Bean BP
Bean BP
中科院分区:
医学1区
文献类型:
--
作者:
Carter BC;Giessel AJ;Sabatini BL;Bean BP

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河豚毒素(TTX)敏感的钠通道在动作电位期间携带大的瞬态电流,也携带“持续”钠电流,这是一种在亚阈值电压下存在的非灭活TTX敏感电流。我们在37°C和接近生理的离子条件下研究了分离的小脑浦肯野神经元和海马CA1神经元的阈下钠电流门控。出乎意料的是,在这两种细胞类型中,亚阈值电压下的小电压步进激活了瞬态钠电流和持久电流的重要组成部分。阈下epsp样波形也激活了大量的瞬态钠电流,但ipsp样波形主要涉及持久钠电流,只有少量额外的瞬态成分。在亚阈值电压下激活瞬态和持久钠电流会产生epsp的放大,epsp对去极化速率敏感,并且可以帮助解释峰值阈值对去极化速率的依赖,正如之前在体内观察到的那样。
Tetrodotoxin (TTX)-sensitive sodium channels carry large transient currents during action potentials and also “persistent” sodium current, a non-inactivating TTX-sensitive current present at subthreshold voltages. We examined gating of subthreshold sodium current in dissociated cerebellar Purkinje neurons and hippocampal CA1 neurons, studied at 37 °C with near-physiological ionic conditions. Unexpectedly, in both cell types small voltage steps at subthreshold voltages activated a substantial component of transient sodium current as well as persistent current. Subthreshold EPSP-like waveforms also activated a large component of transient sodium current, but IPSP-like waveforms engaged primarily persistent sodium current with only a small additional transient component. Activation of transient as well as persistent sodium current at subthreshold voltages produces amplification of EPSPs that is sensitive to the rate of depolarization and can help account for the dependence of spike threshold on depolarization rate, as previously observed in vivo.
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