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OBJECTIVE—Neuropeptide Y is a potent vasoconstrictor thought to enhance the development of atherosclerosis. The leucine 7 to proline 7 (Leu7Pro) polymorphism, located in the signal peptide part of the human preproneuropeptide Y, has been associated with serum lipid levels, intima-media thickness of the common carotid arteries, and diabetic retinopathy in type 2 diabetic patients. Therefore, we investigated the impact of the Leu7Pro polymorphism on diabetic nephropathy, cardiovascular risk factors, and cardiovascular disease in type 1 diabetic patients. RESEARCH DESIGN AND METHODS—A total of 996 patients from the Finnish Diabetic Nephropathy study were studied in a case-control, cross-sectional study. The carrier frequency of the Pro7 substitution was 13% in the entire study population. RESULTS—The Pro7 substitution was more common in patients with proteinuria than in those with a normal albumin excretion rate (16 vs. 11%, P &amp;lt; 0.05). Patients with the Pro7 allele had worse glycemic control (HbA1c 8.8 vs. 8.5%, P &amp;lt; 0.005), more coronary heart disease (CHD) (14 vs. 8%, P &amp;lt; 0.05), and higher serum triglycerides (1.65 vs. 1.35 mmol/l, P &amp;lt; 0.005) than patients with the wild-type genotype. There were no differences in the plasma neuropeptide Y levels between the patients with Pro7 compared with those with the wild-type genotype. The Leu7Pro polymorphism was independently associated with HbA1c (P &amp;lt; 0.001), proteinuria (P &amp;lt; 0.01), and CHD (P &amp;lt; 0.01) in multiple regression analyses. CONCLUSIONS—We conclude that the Leu7Pro polymorphism may contribute to the genetic susceptibility to diabetic nephropathy and CHD in type 1 diabetic patients, possibly by influencing glycemic control and triglycerides.

diabetes care

Leucine 7 to Proline 7 Polymorphism in the Preproneuropeptide Y Is Associated With Proteinuria, Coronary Heart Disease, and Glycemic Control in Type 1 Diabetic Patients