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首页> 外文期刊>Neuron >Multiple roles of calcium ions in the regulation of neurotransmitter release.
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Multiple roles of calcium ions in the regulation of neurotransmitter release.

机译:钙离子在调节神经递质释放中的多种作用。

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摘要

The intracellular calcium concentration ([Ca(2+)]) has important roles in the triggering of neurotransmitter release and the regulation of short-term plasticity (STP). Transmitter release is initiated by quite high concentrations within microdomains, while short-term facilitation is strongly influenced by the global buildup of "residual calcium." A global rise in [Ca(2+)] also accelerates the recruitment of release-ready vesicles, thereby controlling the degree of short-term depression (STD) during sustained activity, as well as the recovery of the vesicle pool in periods of rest. We survey data that lead us to propose two distinct roles of [Ca(2+)] in vesicle recruitment: one accelerating "molecular priming" (vesicle docking and the buildup of a release machinery), the other promoting the tight coupling between releasable vesicles and Ca(2+) channels. Such coupling is essential for rendering vesicles sensitive to short [Ca(2+)] transients, generated during action potentials.
机译:细胞内钙浓度([Ca(2+)])在触发神经递质释放和调节短期可塑性(STP)中起重要作用。递质的释放是由微区中相当高的浓度引起的,而短期促进则受到“残留钙”的整体积累的强烈影响。 [Ca(2+)]的全球上升还加速了释放型囊泡的募集,从而控制了持续活动期间的短期抑郁症(STD)程度,以及在休息期间囊泡池的恢复。我们调查的数据,使我们提出[Ca(2+)]在囊泡募集中的两种不同作用:一种加速“分子引发”(囊泡对接和释放机制的建立),另一种促进可释放囊泡之间的紧密结合。和Ca(2+)通道。这种耦合对于使囊泡对动作电位期间产生的短[Ca(2+)]瞬变敏感至关重要。

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