Potassium channel in vascular smooth muscle

Potassium channels in vascular smooth muscle are a diverse family of ion channels that play a central role in controlling vascular tone, blood vessel diameter, and blood pressure by regulating the membrane potential of vascular smooth muscle cells[1][2][4][5][6]. At least five classes are recognized: large-conductance Ca²⁺-activated (BKCa), intermediate/small conductance Ca²⁺-activated (IKCa/SKCa), voltage-gated (KV), ATP-sensitive (KATP), inward rectifier (Kir), and tandem two-pore (K2P) channels[2][6][1]. Their activation leads to K⁺ efflux, membrane hyperpolarization, closure of voltage-dependent Ca²⁺ channels, and vasodilation, while their inhibition results in membrane depolarization, increased Ca²⁺ influx, and vasoconstriction[4][2][1]. These channels are thus fundamental regulators of vascular reactivity and blood pressure and are implicated in a range of disease states including hypertension, atherosclerosis, diabetes, and vascular proliferative disorders[2][5][4]. Potassium channels are validated therapeutic targets, with pharmacological openers (e.g., minoxidil, diazoxide, pinacidil) and blockers (e.g., glibenclamide, 4-AP, tetraethylammonium) in clinical or investigative use for cardiovascular and other indications[2][3][7]. Targeting these channels carries the risk of dysregulated vascular tone and arrhythmias due to shared channel subtypes among tissues[3][4][2].

Other names

Vascular smooth muscle potassium channelVSM potassium channelVascular K⁺ channelVSMC potassium channelVascular K⁺ ion channel

Channel activation causes membrane hyperpolarization, closure of voltage-dependent calcium channels, decreased intracellular Ca²⁺, and vasodilation; Channel inhibition causes membrane depolarization, opening of calcium channels, increased Ca²⁺ influx, and vasoconstriction; Proliferation control through modulation of membrane potential and signaling pathways