Abstract
ATP-sensitive K+ channels (KATP) are inwardly-rectifying potassium channels, broadly expressed throughout the body. KATP is regulated by adenine nucleotides, characteristically being activated by falling ATP and rising ADP levels thus playing an important physiological role by coupling cellular metabolism with membrane excitability. The hetero-octameric channel complex is formed of 4 pore-forming inward rectifier Kir6.x subunits (Kir6.1 or Kir6.2) and 4 regulatory sulfonylurea receptor subunits (SUR1, SUR2A, or SUR2B). These subunits can associate in various tissue-specific combinations to form functional KATP channels with distinct electrophysiological and pharmacological properties. KATP channels play many important physiological roles and mutations in channel subunits can result in diseases such as disorders of insulin handling, cardiac arrhythmia, cardiomyopathy, and neurological abnormalities. The tissue-specific expression of KATP channel subunits coupled with their rich and diverse pharmacology makes KATP channels attractive therapeutic targets in the treatment of endocrine and cardiovascular diseases.
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Acknowledgement
This work was supported by the British Heart Foundation (RG/15/15/31742) and The National Institute for Health Research Barts Cardiovascular Biomedical Research. The authors have no conflicts of interest to declare.
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Li, Y., Aziz, Q., Tinker, A. (2021). The Pharmacology of ATP-Sensitive K+ Channels (KATP). In: Gamper, N., Wang, K. (eds) Pharmacology of Potassium Channels. Handbook of Experimental Pharmacology, vol 267. Springer, Cham. https://doi.org/10.1007/164_2021_466
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