Voltage-gated potassium channel (Kv channel) (Kv channel)

Voltage-gated potassium (Kv) channels are a diverse superfamily of transmembrane proteins that play a fundamental role in controlling the electrical excitability of cells [1]. They function by selectively conducting potassium ions across the cell membrane in response to changes in the membrane potential, primarily facilitating the repolarization phase of action potentials in neurons and muscle cells [2]. Beyond electrical signaling, these channels are involved in regulating cell volume, neurotransmitter release, and heart rate [3]. Dysfunction of Kv channels, often due to genetic mutations or autoantibodies, is linked to a variety of conditions known as channelopathies, including cardiac arrhythmias (such as Long QT Syndrome), epilepsy, and episodic ataxia [4]. Pharmacologically, they are significant targets; for instance, class III antiarrhythmics block specific Kv channels to prolong the cardiac action potential, while other modulators are used to treat multiple sclerosis and neuropathic pain [5]. However, the structural conservation across the Kv family presents a major challenge for drug development, as off-target inhibition—particularly of the hERG channel—can lead to life-threatening cardiac side effects [6]. Sources: [1] Gutman GA, et al. (2005). Pharmacological Reviews. PMID: 16330684. [2] StatPearls. (2023). Physiology, Potassium Channels. [3] Wulff H, et al. (2009). Nature Reviews Drug Discovery. PMID: 19949401. [4] Kim J. (2014). Journal of the Korean Neurological Association. [5] PubChem. (2024). Compound Summaries for Amiodarone and Fampridine. [6] Sanguinetti MC, Tristani-Firouzi M. (2006). Nature. PMID: 16554806.

Other names

Voltage-dependent potassium channelVoltage-gated K+ channelKvKCN familyPotassium voltage-gated channel

Drugs targeting these channels typically act as pore blockers to inhibit ion flow or as gating modifiers that shift the voltage-dependence of activation or inactivation [3, 5].