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首页> 外文期刊>Neuron >Neurofascins are required to establish axonal domains for saltatory conduction.
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Neurofascins are required to establish axonal domains for saltatory conduction.

机译:需要神经纤维蛋白来建立轴突域以进行盐分传导。

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摘要

Voltage-gated sodium channels are concentrated in myelinated nerves at the nodes of Ranvier flanked by paranodal axoglial junctions. Establishment of these essential nodal and paranodal domains is determined by myelin-forming glia, but the mechanisms are not clear. Here, we show that two isoforms of Neurofascin, Nfasc155 in glia and Nfasc186 in neurons, are required for the assembly of these specialized domains. In Neurofascin-null mice, neither paranodal adhesion junctions nor nodal complexes are formed. Transgenic expression of Nfasc155 in the myelinating glia of Nfasc-/- nerves rescues the axoglial adhesion complex by recruiting the axonal proteins Caspr and Contactin to the paranodes. However, in the absence of Nfasc186, sodium channels remain diffusely distributed along the axon. Our study shows that the two major Neurofascins play essential roles in assembling the nodal and paranodal domains of myelinated axons; therefore, they are essential for the transition to saltatory conduction in developing vertebrate nerves.
机译:电压门控性钠通道集中在Ranvier结节旁的髓鞘神经中,旁侧结节旁是腋窝神经胶质结。这些必需的淋巴结和旁淋巴结域的建立是由形成髓鞘的神经胶质细胞决定的,但机制尚不清楚。在这里,我们显示了这些特殊域的组装需要神经胶质蛋白的两个同工型,神经胶质中的Nfasc155和神经元中的Nfasc186。在无神经链球蛋白的小鼠中,既没有形成旁淋巴结粘连,也没有形成淋巴结复合物。 Nfasc155在Nfasc-/-神经的有髓胶质细胞中的转基因表达通过将轴突蛋白Caspr和Contactin募集到腹节旁来拯救轴突粘附复合体。但是,在缺少Nfasc186的情况下,钠通道仍沿轴突分散地分布。我们的研究表明,两种主要的神经乳链球蛋白在组装髓鞘轴突的淋巴结和淋巴结中起着至关重要的作用。因此,它们对于发育中的脊椎动物神经向盐传导的过渡至关重要。

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