Submembranous cytoskeletons stabilize nodes of Ranvier

Experimental Neurology
Keiichiro SusukiMatthew N Rasband

Abstract

Rapid action potential propagation along myelinated axons requires voltage-gated Na(+) (Nav) channel clustering at nodes of Ranvier. At paranodes flanking nodes, myelinating glial cells interact with axons to form junctions. The regions next to the paranodes called juxtaparanodes are characterized by high concentrations of voltage-gated K(+) channels. Paranodal axoglial junctions function as barriers to restrict the position of these ion channels. These specialized domains along the myelinated nerve fiber are formed by multiple molecular mechanisms including interactions between extracellular matrix, cell adhesion molecules, and cytoskeletal scaffolds. This review highlights recent findings into the roles of submembranous cytoskeletal proteins in the stabilization of molecular complexes at and near nodes. Axonal ankyrin-spectrin complexes stabilize Nav channels at nodes. Axonal protein 4.1B-spectrin complexes contribute to paranode and juxtaparanode organization. Glial ankyrins enriched at paranodes facilitate node formation. Finally, disruption of spectrins or ankyrins by genetic mutations or proteolysis is involved in the pathophysiology of various neurological or psychiatric disorders.

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Citations

Oct 22, 2016·Neuroscience Research·Ryan B GriggsKeiichiro Susuki
Jun 23, 2019·Experimental Biology and Medicine·Beata MachnickaAleksander F Sikorski
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Jul 12, 2020·Nature Reviews. Neurology·Catherine LubetzkiAnne Desmazières

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