Journal
DIABETES
Volume 51, Issue -, Pages S363-S367Publisher
AMER DIABETES ASSOC
DOI: 10.2337/diabetes.51.2007.S363
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E23K, a common polymorphism in the pore-forming subunit K(IR)6.2 of pancreatic beta-cell ATP-sensitive K+ (K-ATP) channels, is functionally relevant and thus might play a major role in the pathophysiology of common type 2 diabetes. In this study, We show that in the simultaneous presence of activatory and inhibitory nucleotides, the polymorphism exerts opposite effects on the potencies of these modulators: channel opening through nucleoside diphosphates is facilitated, whereas sensitivity toward inhibition through ATP is slightly decreased. The results support the conclusion that E23K predisposes to type 2 diabetes by changing the channel's response to physiological variation of cytosolic nucleon tides, resulting in K-ATP overactivity and discrete. inhibition of insulin release.
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