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首页> 外文期刊>Neuron >Control of presynaptic function by a persistent Na(+) current.
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Control of presynaptic function by a persistent Na(+) current.

机译:通过持续的Na(+)电流控制突触前功能。

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摘要

Little is known about ion channels that regulate the graded, subthreshold properties of nerve terminals. Using the calyx of Held, we demonstrate here a large presynaptic persistent Na(+) current with unusually hyperpolarized activation voltage. This feature allowed the current to determine both the resting potential and resting conductance of the nerve terminal. Calyces express presynaptic glycine receptors whose activation depolarizes the synapse. We found that activation of the persistent Na(+) current was an essential component in the response to glycine. This Na(+) current originated at or very close to the terminal and was sustained even after trains of large spike-like depolarizations. Because Na(+) channels also underlie the presynaptic action potential, we conclude that their action both triggers and modulates exocytosis through control of presynaptic membrane voltage.
机译:关于调节神经末梢的分级,亚阈值特性的离子通道知之甚少。使用Held的花萼,我们在这里展示了具有异常超极化激活电压的大突触前持续Na(+)电流。此功能允许电流确定神经末梢的静息电位和静息电导。花萼表达突触前的甘氨酸受体,其活化使突触去极化。我们发现持久性Na(+)电流的激活是对甘氨酸反应的重要组成部分。 Na(+)电流起源于或非常接近末端,即使经过一系列大的尖峰状去极化后仍持续存在。由于Na(+)通道也位于突触前动作电位的基础上,因此我们得出结论,它们的动作既可以通过控制突触前膜电压来触发并调节胞吐作用。

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