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首页> 外文期刊>Neuron >Postfusional control of quantal current shape.
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Postfusional control of quantal current shape.

机译:电流后形状的融合后控制。

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摘要

Whether glutamate is released rapidly, in an all-or-none manner, or more slowly, in a regulated manner, is a matter of debate. We analyzed the time course of excitatory postsynaptic currents (EPSCs) at glutamatergic neuromuscular junctions of Drosophila and found that the decay phase of EPSCs was protracted to a variable extent. The protraction was more pronounced in evoked and spontaneous quantal EPSCs than in action potential-evoked multiquantal EPSCs; reduced in quantal EPSCs from endophilin null mutants, which maintain release via kiss-and-run; and dependent on synaptotagmin isoform, calcium, and protein phosphorylation. Our data indicate that glutamate is released from individual synaptic vesicles for milliseconds through a fusion pore. Quantal glutamate discharge time course depends on presynaptic calcium inflow and the molecular composition of the release machinery.
机译:谷氨酸究竟以全有或全无的方式释放,还是以受控的方式释放得更慢,这是一个有争议的问题。我们分析了果蝇的谷氨酸能神经肌肉交界处的兴奋性突触后电流(EPSCs)的时间过程,发现EPSCs的衰变阶段变长。在诱发和自发的定量EPSC中,这种倾向比在动作电位诱发的多量子EPSC中更明显。减少了来自内啡肽无效突变体的定量EPSC,它们通过接吻运行而释放;并取决于突触结合素亚型,钙和蛋白质的磷酸化。我们的数据表明,谷氨酸通过融合孔从单个突触囊泡中释放了毫秒。谷氨酸释放的时间过程取决于突触前钙的流入和释放机制的分子组成。

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