ATP-Sensitive Potassium Channel (Vascular Smooth Muscle) (K_ATP channel)

ATP-sensitive potassium channels (K_ATP channels) are present in vascular smooth muscle cells and play a crucial role in regulating vascular tone, blood flow, and the response to both pharmacological and endogenous vasodilators. These channels act as metabolic sensors that couple the cell’s metabolic state to membrane excitability by responding to intracellular levels of ATP and ADP. The Kir6.1/SUR2B combination forms the dominant K_ATP channel subtype in this tissue. Activation of these channels causes membrane hyperpolarization, leading to vasodilation. Dysfunction is linked to hypertension and impaired response to vasodilators.

Other names

Vascular smooth muscle KATP channelKir6.1/SUR2B channel

Activation leads to membrane hyperpolarization, reduced calcium influx, and vasodilation. Inhibition leads to membrane depolarization and vasoconstriction.