Differential expression of tetrodotoxin-resistant sodium channels Na v1.8 and Nav1.9 in normal and inflamed rats

Richard E. Coggeshall, Simon Tate, Susan M. Carlton

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


In an attempt to understand mechanisms underlying peripheral sensitization of primary afferent fibers, we investigated the presence of the tetrodotoxin-resistant Na+ channel subunits Nav1.8 (SNS) and Nav1.9 (SNS2) on axons in digital nerves of normal and inflamed rat hindpaws. In normal animals, 14.3% of the unmyelinated and 10.7% of the myelinated axons labeled for the Nav1.8 subunit. These percentages significantly increased in 48 h inflamed animals to 22.0% (1.5-fold increase) and 57.5% (6-fold increase) for unmyelinated and myelinated axons, respectively. In normal animals, Nav1.9 labeled 9.9% of the unmyelinated and 2.1% of the myelinated axons and following inflammation, the proportion of Na v1.9-labeled unmyelinated axons significantly decreased to 3.0% with no change in the proportion of labeled myelinated axons. These data indicate that Nav1.8 and Nav1.9 subunits are transported to the periphery in normal animals and are differentially regulated during inflammation. The massive increase in Nav1.8 expression in myelinated axons suggests that these may contribute to peripheral sensitization and inflammatory hyperalgesia.

Original languageEnglish (US)
Pages (from-to)45-48
Number of pages4
JournalNeuroscience Letters
Issue number1-2
StatePublished - Jan 23 2004


  • Nociception
  • Pain
  • Primary afferent
  • Tetrodotoxin-resistant sodium channel

ASJC Scopus subject areas

  • Neuroscience(all)


Dive into the research topics of 'Differential expression of tetrodotoxin-resistant sodium channels Na <sub>v</sub>1.8 and Na<sub>v</sub>1.9 in normal and inflamed rats'. Together they form a unique fingerprint.

Cite this