ATP-sensitive inward-rectifier potassium channel 6.2 (Kir6.2) (Kir6.2)

The ATP-sensitive inward-rectifier potassium channel 6.2 (Kir6.2) is a critical pore-forming subunit of the K-ATP channel complex, primarily found in pancreatic beta cells, skeletal muscle, and the heart (UniProt: Q14654). It acts as a metabolic sensor by responding to the intracellular ATP/ADP ratio, thereby coupling cellular metabolism to membrane excitability (PubMed: 15505128). In the pancreas, an increase in ATP levels causes the Kir6.2 channel to close, which triggers membrane depolarization and the subsequent release of insulin (NCBI Gene: 3767). Mutations in the KCNJ11 gene, which encodes Kir6.2, are a major cause of permanent neonatal diabetes and congenital hyperinsulinism (PubMed: 17143310). This channel is the primary therapeutic target for sulfonylureas, which are used to treat type 2 diabetes by promoting channel closure and insulin secretion (StatPearls: NBK537105). Conversely, potassium-channel openers like diazoxide are used to manage hyperinsulinemia by keeping the channel open and preventing insulin release (PubChem: CID 3019).

Other names

KCNJ11Potassium channel, inwardly rectifying subfamily J member 11BIRIKATPHHF2MODY13TNDM3

Drugs act as channel blockers (sulfonylureas and meglitinides) to stimulate insulin secretion by inducing membrane depolarization, or as channel openers (diazoxide) to inhibit insulin secretion by hyperpolarizing the cell membrane (StatPearls: NBK537105).