Authors: M von Eynatten P M Lepper D Liu K Lang M Baumann P P Nawroth A Bierhaus K A Dugi U Heemann B Allolio P M Humpert
Publish Date: 2007/07/18
Volume: 50, Issue: 9, Pages: 1930-1937
Abstract
Retinolbinding protein 4 RBP4 has recently been reported to be associated with insulin resistance and the metabolic syndrome This study tested the hypothesis that RBP4 is a marker of insulin resistance and the metabolic syndrome in patients with type 2 diabetes or coronary artery disease CAD or in nondiabetic control subjects without CADSerum RBP4 was measured in 365 men 126 with type 2 diabetes 143 with CAD and 96 control subjects and correlated with the homeostasis model assessment of insulin resistance index HOMAIR components of the metabolic syndrome and lipoprotein metabolism RBP4 was detected by ELISA and validated by quantitative Western blottingRBP4 concentrations detected by ELISA were shown to be strongly associated with the results gained in quantitative Western blots There were no associations of RBP4 with HOMAIR or HbA1c in any of the groups studied In patients with type 2 diabetes there were significant positive correlations of RBP4 with total cholesterol LDLcholesterol VLDLcholesterol plasma triacylglycerol and hepatic lipase activity In patients with CAD there were significant associations of RBP4 with VLDLcholesterol plasma triacylglycerol and hepatic lipase activity while nondiabetic control subjects without CAD showed positive correlations of RBP4 with VLDLcholesterol and plasma triacylglycerolRBP4 does not seem to be a valuable marker for identification of the metabolic syndrome or insulin resistance in male patients with type 2 diabetes or CAD Independent associations of RBP4 with proatherogenic lipoproteins and enzymes of lipoprotein metabolism indicate a possible role of RBP4 in lipid metabolism
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