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• W2678384227 abstract "ATP-sensitive K+ channels (K(ATP) channels) play an important role in glucose homeostasis. A single nucleotide polymorphism (SNP) in the Kir6.2 subunit causes a point mutation of Glu23 to lysine and reduces the ATP sensitivity of pancreatic K(ATP) channels. The SNP found in 58% of Caucasians accounts for 15% of type 2 diabetes. Here we show evidence for dysregulations of muscular K(ATP) channels with the E23K variation. We were particularly interested in the channel modulation by intracellular protons, as pH changes widely and frequently in skeletal muscles. Surprisingly, we found that the defect of the E23K variant was more related to pH than ATP. A level of intracellular acidification seen during exercise not only activated the E23K channel more readily than the wild type, but also relieved the channel inhibition by ATP, leading to a vast increase in the channel open-state probability by approximately sevenfold at pH 6.8 over the wild-type channel at pH 7.4. Considering the reduction in sarcolemmal excitability, muscle fatigue, and impairment of muscular glucose uptake found previously by genetically disrupting K(ATP) channels, it is likely that the E23K variant in muscular K(ATP) channels affects systemic glucose homeostasis and poses an important risk factor for type 2 diabetes and obesity." @default.
• W2678384227 created "2017-06-30" @default.
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• W2678384227 date "2005-05-01" @default.
• W2678384227 modified "2023-09-27" @default.
• W2678384227 title "Single Nucleotide Polymorphisms in KATP Channels" @default.
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• W2678384227 doi "https://doi.org/10.2337/diabetes.54.5.1592" @default.
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