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What does KATP stand for?

KATP stands for ATP-sensitive K+ channels

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Nicorandil is a hybrid ATP-sensitive K+ (KATP) channel opener and nicotinamide nitrate NO donor. Nicorandil selectively activates SUR2B- versus SUR2A-containing KATP channels. It enhances endothelial NO synthase expression and protects against ischemic ventricular arrhythmias. By activating potassium channels, and donating nitric oxide to activate the enzyme guanylate cyclase, Nicorandil causes activation of GMP leading to both arterial and venous vasodilatation.
5239. 1166. PMID 7502040.   ^ Seino S, Miki T (February 2003). "Physiological and pathophysiological roles of ATP-sensitive K+ channels". Prog. Biophys. Mol. Biol. 81 (2): 133–76.
Several voltage-dependent calcium channel (Cav) mRNAs and cyclic nucleotide-gated (CNG) proteins have been detected in sperm cell precursors. Furthermore, low-voltage-activated, dihydropyridine-sensitive 'T-type' channels and pharmacologically defined N- and R-type currents have been measured in spermatogenic cells. " The CatSper gene is unique because it codes for a single, 6-transmembrane-spanning repeat (like voltage-dependent K+ channels such as Kv, and yet its pore region and overall homology is closest to a single domain of the much larger 4-repeat Cav channels.
Reyes R, Duprat F, Lesage F, Fink M, Salinas M, Farman N, Lazdunski M (Nov 1998). "Cloning and expression of a novel pH-sensitive two pore domain K+ channel from human kidney". The Journal of Biological Chemistry 273 (47): 30863–9. doi:10. 1074/jbc. 273. 47.