Regulatory role of voltage-gated Na+ channel β subunits in sensory neurons

Mohamed Chahine, Michael E. O'Leary

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Voltage-gated sodium Na+ channels are membrane-bound proteins incorporating aqueous conduction pores that are highly selective for sodium Na+ ions. The opening of these channels results in the rapid influx of Na+ ions that depolarize the cell and drive the rapid upstroke of nerve and muscle action potentials. While the concept of a Na+-selective ion channel had been formulated in the 1940s, it was not until the 1980s that the biochemical properties of the 260-kDa and 36-kDa auxiliary β subunits (β1, β2) were first described. Subsequent cloning and heterologous expression studies revealed that the α subunit forms the core of the channel and is responsible for both voltage-dependent gating and ionic selectivity. To date, 10 isoforms of the Na+ channel α subunit have been identified that vary in their primary structures, tissue distribution, biophysical properties, and sensitivity to neurotoxins. Four β subunits (β14) and two splice variants (β1A, β1B) have been identified that modulate the subcellular distribution, cell surface expression, and functional properties of the α subunits. The purpose of this review is to provide a broad overview of β subunit expression and function in peripheral sensory neurons and examine their contributions to neuropathic pain.

Original languageEnglish (US)
Article numberArticle 70
JournalFrontiers in Pharmacology
Volume2 NOV
StatePublished - 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Pharmacology (medical)


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