Cited by 268Ion channel regulation and functionNeuroscience and Neuropharmacology ResearchIon Transport and Channel Regulation

Neurofascin assembles a specialized extracellular matrix at the axon initial segment

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Hedstrom, Kristian L., Xu, Xiaorong, Ogawa, Yasuhiro, Frischknecht, Renato, Seidenbecher, Constanze I., Shrager, Peter, Rasband, Matthew N.·2007·The Journal of Cell Biology

Abstract

Action potential initiation and propagation requires clustered Na+ (voltage-gated Na+ [Nav]) channels at axon initial segments (AIS) and nodes of Ranvier. In addition to ion channels, these domains are characterized by cell adhesion molecules (CAMs; neurofascin-186 [NF-186] and neuron glia–related CAM [NrCAM]), cytoskeletal proteins (ankyrinG and βIV spectrin), and the extracellular chondroitin-sulfate proteoglycan brevican. Schwann cells initiate peripheral nervous system node formation by clustering NF-186, which then recruits ankyrinG and Nav channels. However, AIS assembly of this protein complex does not require glial contact. To determine the AIS assembly mechanism, we silenced expression of AIS proteins by RNA interference. AnkyrinG knockdown prevented AIS localization of all other AIS proteins. Loss of NF-186, NrCAM, Nav channels, or βIV spectrin did not affect other neuronal AIS proteins. However, loss of NF-186 blocked assembly of the brevican-based AIS extracellular matrix, and NF-186 overexpression caused somatodendritic brevican clustering. Thus, NF-186 assembles and links the specialized brevican-containing AIS extracellular matrix to the intracellular cytoskeleton.

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Authors
Hedstrom, K. L., Xu, X., Ogawa, Y., Frischknecht, R., Seidenbecher, C. I., Shrager, P., & Rasband, M. N.
Affiliations
  • UConn Health (US)
  • University of Rochester Medicine (US)
  • Leibniz Institute for Neurobiology (DE)
Venue
The Journal of Cell Biology
Published
2007-08-20
Volume
178
Issue
5
Pages
875-886
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2159315879
Cited by
268
References
45
Citations by year
2026: 4 · 2025: 8 · 2024: 12 · 2023: 10 · 2022: 11 · 2021: 12 · 2020: 15 · 2019: 18 · 2018: 15 · 2017: 15 · 2016: 10 · 2015: 20 · 2014: 17 · 2013: 21 · 2012: 20
FWCI
5.96
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
National Institute of Neurological Disorders and Stroke (R01NS017965, NS 044916, NS 17965, R01NS044916, R37NS044916)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
neurofascin 186, axon initial segment, extracellular matrix assembly, brevican, chondroitin sulfate proteoglycans, ankyrin-G, βIV-spectrin, nodes of Ranvier, Schwann cells, adhesion molecules, cytoskeletal anchoring, action potential generation, RNAi knockdown
MeSH terms
Animals, Axons, Cells, Cultured, Cytoskeleton, Extracellular Matrix, Hippocampus, Nerve Growth Factors, Nerve Tissue Proteins, Chondroitin Sulfate Proteoglycans, Ranvier's Nodes, Recombinant Fusion Proteins, RNA, Spectrin, Sodium Channels, Cell Adhesion Molecules, Ankyrins, RNA Interference, Lectins, C-Type, Rats, Brevican

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