Sodium channel protein subunit alpha (NaV alpha) (NaV alpha)

Voltage-gated sodium channel (NaV) alpha subunits are large, pore-forming transmembrane proteins essential for the generation and propagation of action potentials in excitable cells (Catterall, 2000, Neuron). In peripheral neurons, the specific isoforms NaV1.7, NaV1.8, and NaV1.9 are predominantly expressed and serve as critical regulators of nociceptive (pain) signaling (Dib-Hajj et al., 2013, Nat Rev Neurosci). These channels open in response to membrane depolarization, allowing an influx of sodium ions that further depolarizes the cell, a process vital for transmitting sensory information from the periphery to the spinal cord (Bennett et al., 2014, Lancet Neurol). Mutations in the genes encoding these subunits, such as SCN9A, are linked to severe pain disorders, including inherited erythromelalgia and congenital insensitivity to pain (Cox et al., 2006, Nature). Because of their localized expression and central role in pain pathways, peripheral NaV alpha subunits are primary targets for analgesic drug development (Wood et al., 2004, J Physiol). Therapeutic strategies include non-selective local anesthetics like lidocaine and newer, isoform-selective inhibitors like suzetrigine, which aim to block sodium conductance and reduce neuronal hyperexcitability without affecting the central nervous system or cardiac function (Jones et al., 2024, N Engl J Med).

Other names

Voltage-gated sodium channel alpha subunitVGSC alpha subunitPeripheral sodium channelSCN9ASCN10ASCN11ANaV1.7NaV1.8NaV1.9

Inhibition of sodium ion conductance through the alpha subunit pore, preventing membrane depolarization and the propagation of action potentials in peripheral sensory neurons.