The effects of rosiglitazone, a peroxisome proliferator-activated receptor-gamma agonist, on markers of endothelial cell activation, C-reactive protein, and fibrinogen levels in non-diabetic coronary artery disease patients.

OBJECTIVES We sought to assess the effect of rosiglitazone on markers of endothelial cell activation and acute-phase reactants in non-diabetic patients with coronary artery disease (CAD). BACKGROUND Inflammation plays a key role in all stages of atherosclerosis and in the genesis of acute coronary syndromes. Rosiglitazone, a peroxisome proliferator-activated receptor gamma agonist, is used in the treatment of type 2 diabetes mellitus, and previous data suggest that it may have anti-inflammatory effects on atherosclerosis. METHODS Patients with stable, angiographically documented CAD without diabetes mellitus were investigated. Patients were randomized in a double-blind manner to receive treatment with placebo or rosiglitazone (4 mg/day for 8 weeks followed by 8 mg/day for 4 weeks) for 12 weeks. Eighty-four patients completed the study. Fasting glucose, insulin, lipid profile, markers of endothelial activation, and inflammatory markers were measured at baseline and after 12 weeks. RESULTS Rosiglitazone treatment resulted in a significant reduction in E-selectin (p = 0.03), von Willebrand factor (p = 0.007), C-reactive protein (p < 0.001), fibrinogen (p = 0.003) and the homeostasis model of insulin resistance index (p = 0.02), compared with placebo. Significant elevations in low-density lipoprotein and triglyceride levels were observed in the rosiglitazone group (p < 0.01). Within the rosiglitazone-treated group, reductions in C-reactive protein and von Willebrand factor were significantly correlated with a reduction in insulin resistance. CONCLUSIONS Rosiglitazone significantly reduces markers of endothelial cell activation and levels of acute-phase reactants in CAD patients without diabetes. Potential underlying mechanisms include insulin sensitization and direct modification of transcription within the vessel wall.