Abstract
Resveratrol (3,4',5-trihydroxystilbene) has been reported to have a variety of anti-inflammatory, anti-carcinogenic, anti-fungal and anti-platelet effects. It occurs naturally in different medicinal plants. Recently, resveratrol and other related phenolic compounds including trans -3,3',5,5'-tetrahydroxy-4'-methoxystilbene and yuccaols A and C were isolated from the bark of Yucca schidigera . The aim of the present study was to evaluate in vitro the effects of these compounds on platelet aggregation induced by thrombin and ADP. Pretreatment of platelets with resveratrol or other tested phenolics (1-25 w g/ml) slightly reduced platelet aggregation stimulated by 5 w M ADP ( P < 0.05) or 10 w M ADP ( P < 0.005). The comparison of the inhibitory effects of tested compound in thrombin-induced platelet aggregation revealed that phenolic showed even stronger antiplatelet actions than resveratrol. These compounds also had an inhibitory effect on the thrombin-induced enzymatic platelet lipid peroxidation determined as the level of thiobarbituric acid reactive substances.
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