Tetrodotoxin-sensitive voltage-gated sodium channel (TTX-s VGSC) (TTX-s VGSC)

Tetrodotoxin-sensitive voltage-gated sodium channels (TTX-s VGSCs) are critical transmembrane proteins that facilitate the rapid influx of sodium ions into cells in response to membrane depolarization (Source: StatPearls). This group includes specific isoforms such as Nav1.1, Nav1.2, Nav1.3, Nav1.4, Nav1.6, and Nav1.7, which are distinguished by their high affinity for the neurotoxin tetrodotoxin (Source: UniProt). These channels play a fundamental role in the initiation and propagation of action potentials in the central and peripheral nervous systems, as well as in skeletal muscle (Source: IUPHAR/BPS Guide to Pharmacology). Dysfunction in TTX-s channels is associated with a wide range of channelopathies, including various forms of epilepsy, chronic pain conditions like erythromelalgia, and periodic paralysis (Source: PubMed PMID: 28972144). Therapeutic intervention often involves small molecule inhibitors or local anesthetics that bind to the pore or stabilize inactivated states to dampen neuronal hyperexcitability (Source: NIH/NINDS). Current drug development focuses on achieving subtype selectivity to treat specific conditions like neuropathic pain without causing systemic side effects such as motor weakness or cognitive impairment (Source: PubMed PMID: 30103118). Because these channels are widely expressed, they represent both high-value targets for neurological disorders and significant sources of potential toxicity if not targeted precisely.

Other names

TTX-sensitive sodium channelVoltage-gated sodium channel (TTX-sensitive)TTX-s NaV

These channels are primarily targeted by drugs that block the ion-conducting pore or stabilize the inactivated state of the channel, thereby reducing the frequency of action potential firing in hyperexcitable tissues (Source: IUPHAR/BPS Guide to Pharmacology).