Voltage-gated sodium channel (neuronal subtype) (Nav (for general voltage-gated sodium channel); specific neuronal subtypes include Nav1.1, Nav1.2, Nav1.3, Nav1.6, etc.)

Voltage-gated sodium channels (VGSCs) are transmembrane ion channels essential for action potential initiation and propagation in excitable cells, including neurons. Neuronal subtypes such as Nav1.1, Nav1.2, Nav1.3, and Nav1.6 are especially abundant in the central nervous system and are fundamental for generating and conducting electrical impulses. These channels open in response to membrane depolarization, allowing Na⁺ influx that leads to rapid depolarization, and then quickly inactivate, ensuring directional nerve signaling. Hundreds of mutations in genes encoding neuronal VGSCs are implicated in epilepsy and other hyperexcitability disorders. VGSCs are prominent therapeutic targets for anticonvulsants, analgesics, and local anesthetics, which typically inhibit channel function by blocking ion flow or modulating channel gating. Because VGSCs are crucial for rapid and robust neuronal communication, drugs targeting them must balance therapeutic inhibition with preservation of normal CNS and cardiac function to avoid dose-limiting toxicity.

Other names

voltage-dependent sodium channelsodium channel alpha subunit (brain/neuronal)VGSCVDSCNaVneuronal sodium channel

Blockade of sodium ion conduction through pore inhibition (inhibitors like tetrodotoxin, local anesthetics) - Use-dependent channel blockage (antiepileptics, some antiarrhythmics) - Altered channel inactivation or gating properties