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The insertion allele at the angiotensin I—Converting enzyme gene locus is associated with insulin resistance

Plasma angiotensin I—converting enzyme (ACE) levels are genetically predetermined and are correlated with a deletion (D) insertion (I) polymorphism at the ACE gene locus. A subset of diabetic patients are noted to have elevated ACE levels. Treatment with ACE inhibitors has been shown to improve insulin sensitivity in both diabetic and nondiabetic subjects. We examined the relationship of D I polymorphism and insulin sensitivity in 24 glucose-tolerant subjects by an oral glucose tolerance test (OGTT) and glucose clamps. Subjects with the I allele had higher insulin levels at 90 minutes (515 ± 69 v 250 ± 43 pmol/L, P = .008) and higher insulin area under the curve (56,200 ± 8,148 v 33,300 ± 8,114, P = .022) after glucose challenge compared with subjects without the I allele. During the euglycemic clamp, subjects with the I allele require less glucose infusion to maintain euglycemia than subjects without the I allele (5.343 ± 0.743 v 8.944 ± 1.272 mg/kg/min, P = .020). We conclude that the I allele is associated with insulin resistance in glucose-tolerant and normotensive African-Americans. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metabolism Elsevier

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