Antioxidant activity of resveratrol in endotoxin-stimulated blood platelets

Resveratrol (3,4',5-trihydroxystilbene) is a natural molecule with antioxid ant action. It is also considered to be a molecule with antiplatelet, antic ancer and anti-inflammatory action. The effects of trans-resveratrol on the reactive oxygen species (ROS) generation and thiobarbituric acid-reactive substances (TBARS) in blood platelets induced by endotoxin (lipopolysacchar ide, LPS) or thrombin were studied in vitro. The production of superoxide r adicals (O-2(.)-) and other reactive oxygen species (H2O2, singlet oxygen, and organic radicals) in the presence of resveratrol was measured by a chem iluminescence method in resting blood platelets and platelets stimulated by LPS (0.3 mug/10(8) platelets) or thrombin (2.5 U/10(8) platelets). We have shown that resveratrol (6.25-100 mug/ml) inhibits chemiluminescence and ge neration of O-2(.)- in blood platelets. It has an inhibitory effect on the production of ROS and TBARS in platelets caused by LPS or thrombin.