Peripheral neuronal voltage-gated sodium channel (Peripheral NaV) (Peripheral NaV)

Peripheral neuronal voltage-gated sodium channels (VGSCs), primarily comprising the NaV1.7, NaV1.8, and NaV1.9 subtypes, are essential for the initiation and propagation of action potentials in peripheral sensory neurons, particularly nociceptors (Dib-Hajj et al., 2013, Nat Rev Neurosci). These channels respond to membrane depolarization by opening a pore that allows sodium ions to enter the cell, a process critical for transmitting pain signals from the periphery to the central nervous system (Bennett et al., 2019, Lancet Neurol). NaV1.7 (SCN9A) acts as a threshold setter, NaV1.8 (SCN10A) provides the bulk of the inward current during the action potential upstroke, and NaV1.9 (SCN11A) regulates resting membrane potential and excitability (Wood et al., 2004, J Pain). Mutations in the genes encoding these channels are linked to diverse pain disorders, such as inherited erythromelalgia and congenital insensitivity to pain, making them high-value targets for non-opioid analgesics (Habibi et al., 2020, Front Pharmacol). Pharmacological modulation typically involves small-molecule inhibitors, such as the selective NaV1.8 inhibitor suzetrigine (VX-548), which aim to block pain signaling while avoiding the cardiac and central nervous system side effects associated with non-selective sodium channel blockers (Vertex Pharmaceuticals, 2024). These channels represent a critical interface between external stimuli and the electrical signaling of the nervous system, and their selective inhibition remains a major focus of drug development for chronic and acute pain management.

Other names

Peripheral voltage-gated sodium channelSensory neuron-specific sodium channelNaV1.7/1.8/1.9 complexPeripheral VGSC

Inhibition of sodium ion influx through the alpha-subunit pore or stabilization of the inactivated state of the channel to prevent action potential propagation in peripheral sensory neurons.