Uncoupling Protein-2 Negatively Regulates Insulin Secretion and Is a Major Link between Obesity, ?? Cell Dysfunction, and Type 2 Diabetes
摘要：
beta cells sense glucose through its metabolism and the resulting increase in ATP, which subsequently stimulates insulin secretion. Uncoupling protein-2 (UCP2) mediates mitochondrial proton leak, decreasing ATP production. In the present study, we assessed UCP2's role in regulating insulin secretion. UCP2-deficient mice had higher islet ATP levels and increased glucose-stimulated insulin secretion, establishing that UCP2 negatively regulates insulin secretion. Of pathophysiologic significance, UCP2 was markedly upregulated in islets of ob/ob mice, a model of obesity-induced diabetes. Importantly, ob/ob mice lacking UCP2 had restored first-phase insulin secretion, increased serum insulin levels, and greatly decreased levels of glycemia. These results establish UCP2 as a key component of beta cell glucose sensing, and as a critical link between obesity, beta cell dysfunction, and type 2 diabetes.
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关键词：
Animals Mice, Knockout Humans Mice Mice, Obese Islets of Langerhans Disease Models, Animal Body Weight Diabetes Mellitus Diabetes Mellitus, Type 2
DOI：
10.1016/S0092-8674(01)00378-6
被引量：
年份：
2001
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