Voltage-gated ion channel superfamily (VGIC)

Voltage-gated sodium, potassium, and calcium channels are the primary members of the voltage-gated ion channel (VGIC) superfamily, which are critical for the generation and propagation of electrical signals in excitable cells such as neurons and myocytes [1][2]. These channels are transmembrane proteins that open their ion-selective pores in response to changes in the membrane potential, allowing specific ions to flow down their electrochemical gradients [1]. Voltage-gated sodium channels (Nav) initiate the rapid depolarization phase of the action potential, while voltage-gated potassium channels (Kv) are responsible for the repolarization phase and maintaining the resting membrane potential [2][3]. Voltage-gated calcium channels (Cav) serve as essential links between electrical excitation and intracellular signaling, triggering processes like muscle contraction, neurotransmitter release, and gene expression [1][3]. Because of their fundamental roles, these channels are major therapeutic targets for a wide range of drugs, including local anesthetics, anti-epileptics, anti-arrhythmics, and antihypertensives [3]. Dysfunctions in these channels, often due to genetic mutations, lead to various channelopathies such as epilepsy, cardiac arrhythmias (e.g., Long QT syndrome), and periodic paralysis [2].

Other names

Voltage-dependent ion channelsVoltage-gated sodium channels (Nav)Voltage-gated potassium channels (Kv)Voltage-gated calcium channels (Cav)VGSCsVGKCsVGCCs

Drugs targeting these channels typically act as pore blockers, gating modifiers, or allosteric modulators to either inhibit or enhance ion conductance, thereby altering cellular excitability and signaling [1][3].