[Frontiers in Bioscience E3, 1467-1474, June 1, 2011]
The A640G CYBA polymorphism associates with subclinical atherosclerosis in diabetes
Maria de Ujue Moreno1, Gorka San Jose1, Ana Fortuno1, Jose Luis Miguel-Carrasco1, Oscar Beloqui2, Javier Diez1,3, Guillermo Zalba1
1Division of Cardiovascular Sciences, Center for Applied Medical Research, University of Navarra, Spain, 2Department of Internal Medicine, University Clinic, University of Navarra, Spain, 3Department of Cardiology and Cardiovascular Surgery, University Clinic, University of Navarra, Spain
TABLE OF CONTENTS
Oxidative stress is implicated in diabetes. The NADPH oxidases are the main source of superoxide in phagocytic and vascular cells, and p22phox is a key subunit. Genetic variants of CYBA, the human p22phox gene, associate with cardiovascular disease. We investigated the association of the A640G polymorphism with diabetes and its impact on phagocytic NADPH oxidase-dependent superoxide production and subclinical atherosclerosis. We studied 1212 subjects in which clinical parameters including carotid intima-media thickness (cIMT) were assessed. The A640G polymorphism was genotyped by TaqMan probes. In 496 subjects, the NADPH oxidase-dependent superoxide production in peripheral blood mononuclear cells was assessed by chemiluminescence. The GG genotype prevalence was significantly higher in type 2 diabetic patients than in non-diabetic subjects. Peripheral blood mononuclear cells from diabetic GG patients presented higher NADPH oxidase-dependent superoxide production than those of diabetic AA/AG patients. Within the diabetic group, GG patients presented higher cIMT levels than AA/AG patients. The A640G CYBA polymorphism may be a marker of oxidative stress risk and may be indicative of subclinical atherosclerosis in type 2 diabetes.