Nodal sodium channel domain integrity depends on the conformation of the paranodal junction, not on the presence of transverse bands

Jack Rosenbluth*, Jeffrey L. Dupree, Brian Popko

*Corresponding author for this work

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Our understanding of the role that axoglial interactions play in node of Ranvier formation and maintenance remains incomplete. Previous studies of CNS myelinated fibers of CGT-null mice showed abnormalities in the arrangement of paranodal myelin loops and absence of a conspicuous component of the paranodal junction, the ridge-like intercellular transverse bands. Axolemmal sodium channel domains were largely preserved at nodes of Ranvier but displayed some abnormalities in form. Using a combination of freeze-fracture and immunocytochemical methods, we have found additional evidence documenting abnormalities in the size, shape, and location of axolemmal sodium channel clusters in CGT-null mice as well as evidence that these nodal abnormalities are complementary to the organization of paranodal myelin loops, despite the absence of transverse bands. We conclude that the differentiated form of the nodal axolemma and the distribution of axolemmal sodium channels depend on the conformation of paranodal axoglial contacts but not on the presence of transverse bands at the sites of contact.

Original languageEnglish (US)
Pages (from-to)318-325
Number of pages8
JournalGlia
Volume41
Issue number3
DOIs
StatePublished - Feb 1 2003

Keywords

  • CGT
  • Freeze-fracture
  • Myelin
  • Node of Ranvier
  • Paranodal junction
  • Sodium channel
  • Transverse bands

ASJC Scopus subject areas

  • Neurology
  • Cellular and Molecular Neuroscience

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