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首页> 外文期刊>Neuron >Postsynaptic positioning of endocytic zones and AMPA receptor cycling by physical coupling of dynamin-3 to Homer.
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Postsynaptic positioning of endocytic zones and AMPA receptor cycling by physical coupling of dynamin-3 to Homer.

机译:突触后定位的内吞区和AMPA受体循环,通过将dynamin-3与Homer物理偶联。

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摘要

Endocytosis of AMPA receptors and other postsynaptic cargo occurs at endocytic zones (EZs), stably positioned sites of clathrin adjacent to the postsynaptic density (PSD). The tight localization of postsynaptic endocytosis is thought to control spine composition and regulate synaptic transmission. However, the mechanisms that situate the EZ near the PSD and the role of spine endocytosis in synaptic transmission are unknown. Here, we report that a physical link between dynamin-3 and the postsynaptic adaptor Homer positions the EZ near the PSD. Disruption of dynamin-3 or its interaction with Homer uncouples the PSD from the EZ, resulting in synapses lacking postsynaptic clathrin. Loss of the EZ leads to a loss of synaptic AMPA receptors and reduced excitatory synaptic transmission that corresponds with impaired synaptic recycling. Thus, a physical link between the PSD and the EZ ensures localized endocytosis and recycling by recapturing and maintaining a proximate pool of cycling AMPA receptors.
机译:AMPA受体和其他突触后货物的内吞作用发生在胞吞区(EZ),网格蛋白的稳定位置邻近突触后密度(PSD)。突触后内吞的紧密定位被认为可以控制脊柱成分并调节突触传递。但是,尚不清楚将EZ定位在PSD附近的机制以及脊柱内吞作用在突触传递中的作用。在这里,我们报告说,dynamin-3和突触后适配器荷马之间的物理链接将EZ定位在PSD附近。 dynamin-3的破坏或与Homer的相互作用使PSD与EZ脱钩,导致突触缺乏突触后网格蛋白。 EZ的丧失导致突触AMPA受体的丧失和兴奋性突触传递的减少,这与受损的突触循环有关。因此,PSD和EZ之间的物理联系可通过重新捕获和维持循环的AMPA受体池来确保局部内吞和再循环。

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