Glial ankyrins facilitate paranodal axoglial junction assembly

Kae Jiun Chang, Daniel R. Zollinger, Keiichiro Susuki, Diane L. Sherman, Michael A. Makara, Peter J. Brophy, Edward C. Cooper, Vann Bennett, Peter J. Mohler, Matthew N. Rasband

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Neuron-glia interactions establish functional membrane domains along myelinated axons. These include nodes of Ranvier, paranodal axoglial junctions and juxtaparanodes. Paranodal junctions are the largest vertebrate junctional adhesion complex, and they are essential for rapid saltatory conduction and contribute to assembly and maintenance of nodes. However, the molecular mechanisms underlying paranodal junction assembly are poorly understood. Ankyrins are cytoskeletal scaffolds traditionally associated with Na+ channel clustering in neurons and are important for membrane domain establishment and maintenance in many cell types. Here we show that ankyrin-B, expressed by Schwann cells, and ankyrin-G, expressed by oligodendrocytes, are highly enriched at the glial side of paranodal junctions where they interact with the essential glial junctional component neurofascin 155. Conditional knockout of ankyrins in oligodendrocytes disrupts paranodal junction assembly and delays nerve conduction during early development in mice. Thus, glial ankyrins function as major scaffolds that facilitate early and efficient paranodal junction assembly in the developing CNS.

Original languageEnglish (US)
Pages (from-to)1673-1681
Number of pages9
JournalNature Neuroscience
Volume17
Issue number12
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

ASJC Scopus subject areas

  • General Neuroscience

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