Voltage-gated sodium channels – peripheral nerve fibers (VGSC (peripheral))

Voltage-gated sodium channels (VGSCs) located in peripheral nerve fibers are critical mediators of sensory signaling, particularly the transmission of pain [1][3]. The primary isoforms involved are Nav1.7, Nav1.8, and Nav1.9, which are predominantly expressed in the dorsal root ganglia and peripheral nociceptors [5][9]. These channels facilitate the rapid influx of sodium ions across the neuronal membrane, a process essential for the generation and propagation of action potentials [10]. Dysregulation or genetic mutations in these channels are directly linked to various pain syndromes, such as erythromelalgia and small fiber neuropathy [7][8]. Consequently, they represent a major therapeutic focus for the development of non-opioid analgesics aimed at treating chronic and neuropathic pain [4][6]. Pharmacological strategies include the use of non-selective local anesthetics like lidocaine and newer, subtype-selective inhibitors such as suzetrigine [4][14]. By specifically targeting peripheral isoforms, researchers aim to achieve potent pain relief while minimizing the central nervous system and cardiovascular side effects associated with broader sodium channel blockade [1][5].

Other names

Peripheral sodium channels [4]Nav1.7 [1]Nav1.8 [1]Nav1.9 [1]Sodium channel protein type 9 subunit alpha [3]Sodium channel protein type 10 subunit alpha [3]Sodium channel protein type 11 subunit alpha [3]SCN9A [3]SCN10A [3]SCN11A [3]PN1 [9]PN3 [9]NaN [9]

Inhibition of sodium ion influx through the channel pore, preventing neuronal depolarization and action potential firing in peripheral sensory neurons [1][5][10].