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Synaptic clustering of AMPA receptors by the extracellular immediate-early gene product Narp (see comments)

机译:细胞外即早基因产物Narp引起AMPA受体的突触聚集(见注释)

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摘要

Narp (neuronal activity-regulated pentraxin) is a secreted immediate-early gene (IEG) regulated by synaptic activity in brain. In this study, we demonstrate that Narp possesses several properties that make it likely to play a key role in excitatory synaptogenesis. Narp is shown to be selectively enriched at excitatory synapses on neurons from both the hippocampus and spinal cord. Overexpression of recombinant Narp increases the number of excitatory but not inhibitory synapses in cultured spinal neurons. In transfected HEK 293T cells, Narp interacts with itself, forming large surface clusters that coaggregate AMPA receptor subunits. Moreover, Narp-expressing HEK 293T cells can induce the aggregation of neuronal AMPA receptors. These studies support a model in which Narp functions as an extracellular aggregating factor for AMPA receptors.
机译:Narp(神经活性调节的五环素)是一种分泌的即刻早期基因(IEG),受大脑突触活性调节。在这项研究中,我们证明了Narp具有多种特性,使其有可能在兴奋性突触发生中发挥关键作用。 Narp被证明在海马和脊髓神经元的兴奋性突触中选择性富集。重组Narp的过表达增加了培养的脊髓神经元中兴奋性突触的数量,但没有抑制突触的数量。在转染的HEK 293T细胞中,Narp与其自身相互作用,形成大表面簇,这些表面簇共同聚集AMPA受体亚基。而且,表达Narp的HEK 293T细胞可以诱导神经元AMPA受体的聚集。这些研究支持其中Narp充当AMPA受体的细胞外聚集因子的模型。

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