Abstract
We tested the hypothesis that carvedilol, a beta-adrenoceptor and alpha-adrenoceptor antagonist with potent antioxidant property, could inhibit tumor necrosis factor-alpha (TNF-alpha)-induced endothelial adhesiveness to human mononuclear cells (MNCs), an early sign of atherogenesis. Circulating MNCs were isolated from the peripheral blood of healthy subjects. Compared with control condition, pretreatment of carvedilol (10 micromol/L for 18 hours) or probucol (5 micromol/L for 18 hours), but not propanolol, prazosin, or both propanolol and prazosin significantly decreased TNF-alpha-stimulated adhesiveness of cultured human aortic endothelial cells (HAECs) to MNCs. Carvedilol inhibited TNF-alpha-stimulated endothelial vascular cell adhesion molecule-1 (VCAM-1) and E-selectin (66.0+/-2.0% and 55.60+/-1.0% of control, P<0.05, respectively) expression, whereas probucol inhibited only VCAM-1 expression (79.0+/-5.0% of control, P<0.05). Propanolol, prazosin, or both did not alter the expression of adhesion molecules. Further, pretreatment with carvedilol significantly inhibited TNF-alpha-stimulated intracellular reactive oxygen species (ROS) production and the activation of redox sensitive nuclear factor kappa B and activator protein-...Continue Reading
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