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首页> 外文期刊>Neuron >Subunit-specific NMDA receptor trafficking to synapses.
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Subunit-specific NMDA receptor trafficking to synapses.

机译:亚单位特异性NMDA受体运输到突触。

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摘要

To elucidate mechanisms controlling the number and subunit composition of synaptic NMDA-Rs in hippocampal slice neurons, the NR1, NR2A, and NR2B subunits were optically and electrophysiologically tagged. The NR2 subunit directs delivery of receptors to synapses with different rules controlling NR2A and NR2B. Synaptic incorporation of NR2B-containing receptors is not limited by synaptic transmission nor enhanced by increased subunit expression. NR2A-containing receptors whose expression normally increases with age replace synaptic NR2B-containing receptors. Replacement is enhanced by increased NR2A expression and requires synaptic activity. Surprisingly, spontaneously released transmitter acting on synaptic NMDA-Rs is sufficient for replacement and reduces NMDA-R responses. Thus, as with AMPA-Rs, synaptic trafficking of NMDA-Rs is tightly regulated and has subunit-specific rules with functionally important consequences.
机译:为了阐明控制海马片神经元中突触NMDA-R数量和亚基组成的机制,对NR1,NR2A和NR2B亚基进行了光学和电生理学标记。 NR2亚基指导受体递送至具有控制NR2A和NR2B的不同规则的突触。含有NR2B的受体的突触掺入不受突触传递的限制,也不受亚单位表达增加的增强。其表达通常随年龄增加的含NR2A受体取代了含突触的NR2B受体。 NR2A表达增加可增强置换作用,并且需要突触活性。令人惊讶地,作用于突触NMDA-R的自发释放的递质足以替代并减少NMDA-R响应。因此,与AMPA-R一样,NMDA-R的突触运输受到严格监管,并具有亚基特异性规则,在功能上具有重要意义。

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