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Functional impairment of the vascular endothelium is an early event in the development of atherosclerosis, and soluble adhesion molecules in plasma are regarded as an indicator of the endothelial damage in diabetes mellitus. We compared the soluble vascular adhesion molecule levels in the patients with diabetic nephropathy in concerning with plasma 7-ketocholesterol levels, which is major cholesterol auto-oxidation products. Average value of plasma VCAM-1 in 31 patients with type 2 diabetes mellitus was 297.6+/-10.2 ng/ml (mean+/-SE), and the value was significantly higher than that in 8 age-matched healthy controls (231.9+/-15.0 ng/ml). Among the 31 diabetic patients, the group with macroalbuminuria (n = 8) had the higher levels of plasma VCAM-1 (349.5+/-26.0 ng/ml) than the levels in the group with normoalbuminuria (n=15; 280.6+/-12.3 ng/ml). The levels of plasma 7-ketocholesterol in diabetes (26.9+/-1.5 ng/ml) or the patients with macroalbuminuria (31.4+/-3.3 ng/ml) were significantly higher than the control (22.5+/-1.8 ng/ml). The level of soluble VCAM-1 showed significant correlation between the values of 7-ketocholesterol (r=0.42, p=0.024), TC (r=0.42, p=0.014) and LDL-C (r=0.38, p=0.044). However no correlation was demonstrated with HbA1c nor creatinine level. We conclude that soluble VCAM-1 in plasma may be an indicator of oxidative stress and vascular injury in diabetic nephropathy.

Plasma Levels of Soluble Vascular Adhesion Molecule-1 and Cholesterol Oxidation Product in Type 2 Diabetic Patients with Nephropathy