Potassium channel subfamily K (K2P)

Potassium channel subfamily K (K2P) members, also known as two-pore domain potassium channels, are a distinct family of ion channels responsible for leak or background potassium currents that stabilize the resting membrane potential (Enyedi & Czirják, 2010, Physiol Rev). Unlike other potassium channels, K2P channels possess four transmembrane segments and two pore-forming loops per subunit, typically functioning as dimers (Goldstein et al., 2005, Pharmacol Rev). They play a critical role in regulating the excitability of neurons, cardiomyocytes, and smooth muscle cells by responding to diverse physiological stimuli, including pH changes, mechanical stretch, temperature, and lipids (Feliciangeli et al., 2015, Pflugers Arch). Dysregulation of K2P channels is implicated in various pathologies, such as chronic pain, depression, cardiac arrhythmias, and pulmonary hypertension (Schmidt et al., 2012, Cardiovasc Res). Pharmacologically, these channels are notable targets for volatile anesthetics and are being explored for the development of novel analgesics and antidepressants (Bayliss & Barrett, 2008, Trends Pharmacol Sci). Their unique structure and gating mechanisms offer opportunities for selective modulation, although achieving high specificity remains a significant therapeutic challenge (Wulff et al., 2009, Nat Rev Drug Discov).

Other names

Two-pore domain potassium channelsKCNK channelsBackground potassium channels4-transmembrane-domain 2-pore-domain potassium channels

Drugs targeting K2P channels primarily act as either activators (openers) to hyperpolarize the cell membrane and reduce cellular excitability, or as inhibitors (blockers) to depolarize the membrane and increase excitability (Renigunta et al., 2015, Pflugers Arch).