Endocytic trafficking and recycling maintain a pool of mobile surface AMPA receptors required for synaptic potentiation.

Endocytic trafficking and recycling maintain a pool of mobile surface AMPA receptors required for synaptic potentiation.
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DOI:
10.1016/j.neuron.2009.05.025
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发表时间:
2009-07-16
期刊:
影响因子:
16.2
通讯作者:
Choquet, Daniel
Choquet, Daniel
中科院分区:
医学1区
文献类型:
--
作者:
Petrini, Enrica Maria;Lu, Jiuyi;Cognet, Laurent;Lounis, Brahim;Ehlers, Michael D.;Choquet, Daniel

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在兴奋性突触中,突触后内吞区(EZ)与突触后致密区(PSD)相邻,介导表面AMPA受体(AMPAR)的网格蛋白依赖性内吞作用,作为受体再循环或降解的第一步。然而,受体再循环是否影响AMPAR的侧向扩散,以及EZ是否对突触增强的表达很重要仍然是未知的。在这里,我们证明了存在的EZ和AMPAR回收保持一个大池的移动的AMPAR在突触。此外,我们发现,突触增强是伴随着AMPAR的积累和固定在突触导致他们的胞吐和稳定在PSD。EZ从突触后区域的位移通过阻断AMPAR再循环而损害突触增强的表达。因此,受体再循环对于维持表面AMPAR的移动的群体是至关重要的,所述表面AMPAR可以被递送到突触以增加突触强度。
At excitatory glutamatergic synapses, postsynaptic endocytic zones (EZs), which are adjacent to the postsynaptic density (PSD), mediate clathrin-dependent endocytosis of surface AMPA Receptors (AMPAR) as a first step to receptor recycling or degradation. However, it remains unknown if receptor recycling influences AMPARs lateral diffusion, and if EZs are important for the expression of synaptic potentiation. Here we demonstrate that the presence of both EZs and AMPAR recycling maintain a large pool of mobile AMPARs at synapses. In addition, we find that synaptic potentiation is accompanied by an accumulation and immobilization of AMPARs at synapses resulting from both their exocytosis and stabilization at the PSD. Displacement of EZs from the postsynaptic region impairs the expression of synaptic potentiation by blocking AMPAR recycling. Thus receptor recycling is crucial for maintaining a mobile population of surface AMPARs which can be delivered to synapses for increases in synaptic strength.
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期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
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