Potassium channel, inwardly rectifying subfamily J member 15 (KCNJ15)

Potassium channel, inwardly rectifying subfamily J member 15 (KCNJ15), also known as Kir4.2, is an integral membrane protein that forms an inward-rectifier potassium channel. It is primarily responsible for allowing potassium ions to flow into cells, maintaining the resting membrane potential and regulating potassium homeostasis in multiple tissues including the kidney, pancreas, stomach, liver, lung, and retina[1][2][3][6]. Kir4.2 channels are notable for their sensitivity to intracellular magnesium, pH, and extracellular potassium concentration, with channel activity largely regulated by these factors. The protein participates in several key biological processes such as glucose-stimulated insulin secretion, histamine-stimulated acid production, cell migration (electrotaxis), and immune defense mechanisms[4][5][6]. Dysregulation or mutation of KCNJ15/Kir4.2 has been implicated in a wide range of diseases, including metabolic disorders (diabetes), neurological diseases (epilepsy, Alzheimer’s), various cancers, kidney disease, and impaired retinal function[1][4][6]. Although direct pharmacological targeting of Kir4.2 is limited, its physiological and pathological significance make it a potential therapeutic target, with caution advised regarding potential electrolyte and organ system disruption when modulating its activity[4][6].

Other names

Kir4.2Kir1.3IRKKATP-sensitive inward rectifier potassium channel 15Potassium inwardly rectifying channel subfamily J member 15Potassium voltage-gated channel subfamily J member 15

Channel blockade (potential mechanism for drugs/compounds that would inhibit the inward potassium current, but no specific clinical drugs currently) Modulation of trafficking or expression (mutational impact, experimental polyamine blockers)