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首页> 外文期刊>Neuron >Retromer mediates a discrete route of local membrane delivery to dendrites
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Retromer mediates a discrete route of local membrane delivery to dendrites

机译:Retromer介导了局部膜传递到树突的离散途径

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摘要

A fundamental and still largely unresolved question is how neurons achieve rapid delivery of selected signaling receptors throughout the elaborate dendritic arbor. Here we show that this requires a conserved sorting machinery called retromer. Retromer-associated endosomes are distributed within dendrites in ~2 μm intervals and supply frequent membrane fusion events into the dendritic shaft domain immediately adjacent to (<300 nm from) the donor endosome and typically without full endosome discharge. Retromer-associated endosomes contain β-adrenergic receptors as well as ionotropic glutamate receptors, and retromer knockdown reduces extrasynaptic insertion of adrenergic receptors as well as functional expression of AMPA and NMDA receptors at synapses. We propose that retromer supports a broadly distributed network of plasma membrane delivery to dendrites, organized in micron-scale axial territories to render essentially all regions of the postsynaptic surface within rapid diffusion distance of a local exocytic event.
机译:一个基本但仍未解决的问题是神经元如何在整个精心设计的树突状乔木中实现快速传递选定的信号受体。在这里,我们表明这需要一种称为Retromer的保守分拣机。与逆向异构体相关的内体以约2μm的间隔分布在树突中,并向与供体内体紧邻(<300 nm)的树突轴结构域提供频繁的膜融合事件,并且通常没有完全的内体放电。与后体相关的内体包含β-肾上腺素受体以及离子型谷氨酸受体,后体敲低可减少肾上腺素能受体的突触外插入以及突触中AMPA和NMDA受体的功能性表达。我们建议,retromer支持微米范围的轴向领土组织的质膜传递到树突的广泛分布的网络,以使突触后表面的基本上所有区域都在局部胞外事件的快速扩散距离内。

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