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The role of selective transport in neuronal protein sorting (see comments)

机译:选择性转运在神经元蛋白分选中的作用(见评论)

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摘要

To assess whether selective microtubule-based vesicle transport underlies the polarized distribution of neuronal proteins, we expressed green fluorescent protein- (GFP-) tagged chimeras of representative axonal and dendritic membrane proteins in cultured hippocampal neurons and visualized the transport of carrier vesicles containing these proteins in living cells. Vesicles containing a dendritic protein, transferrin receptor (TfR), were preferentially transported into dendrites and excluded from axons. In contrast, vesicles containing the axonal protein NgCAM (neuron-glia cell adhesion molecule) were transported into both dendrites and axons. These data demonstrate that neurons utilize two distinct mechanisms for the targeting of polarized membrane proteins, one (for dendritic proteins) based on selective transport, the other (for axonal proteins) based on a selectivity "filter" that occurs downstream of transport.
机译:若要评估是否选择性的基于微管的囊泡运输是神经元蛋白的极化分布的基础,我们在培养的海马神经元中表达了代表轴突和树突状膜蛋白的绿色荧光蛋白-(GFP-)标记的嵌合体,并可视化了包含这些蛋白的载体囊泡的运输在活细胞中。含有树突蛋白,转铁蛋白受体(TfR)的囊泡优先运输到树突中,并从轴突中排除。相反,含有轴突蛋白NgCAM(神经胶质细胞粘附分子)的囊泡既被运输到树突中,又被运输到轴突中。这些数据表明,神经元利用两种截然不同的机制靶向极化膜蛋白,一种针对选择性运输的树突状蛋白,另一种针对发生在运输下游的选择性“过滤器”(针对轴突蛋白)。

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