title: Resveratrol inhibits aggregation of platelets from high-risk cardiac patients with aspirin resistance.
abstract: Up to 20% of serious vascular events in high-risk vascular patients is attributable to a failure of aspirin (ASA) to suppress platelet aggregation. Resveratrol is a cardioprotective phytoestrogen that can inhibit platelet aggregation in animal models. We hypothesized that resveratrol can also inhibit aggregation of platelets from ASA-resistant (ASA-R) patients. Thus, platelet-rich plasma was isolated from ASA-sensitive (ASA-S) and ASA-R patients (aspirin resistance was defined as higher-than-expected aggregation to collagen and epinephrine [>/=40%] after oral treatment with 100 mg/d ASA). Aggregation to adenosine diphosphate (ADP; 5 and 10 mumol/L), collagen (2 mug/mL), and epinephrine (10 mumol/L) in the absence and presence of resveratrol (10 mol/L) was measured by optical aggregometry. Maximal aggregation to 5 mumol/L ADP was only slightly affected by resveratrol. Similar results were obtained using 10 mumol/L ADP. Maximal aggregation of ASA-R platelets to collagen was significantly decreased by resveratrol, whereas resveratrol had only marginal effects in ASA-S platelets. Similar results were obtained with epinephrine as well. Collectively, resveratrol effectively inhibited collagen- and epinephrine-induced aggregation of platelets from ASA-R patients, which may contribute to its cardioprotective effects in high-risk cardiac patients.
authors.affiliation: State Hospital for Cardiology, Balatonfured, Hungary.
authors.forename: Gyorgyi
authors.initials: G
authors.lastname: Stef
authors.forename: Anna
authors.initials: A
authors.lastname: Csiszar
authors.forename: Kenneth
authors.initials: K
authors.lastname: Lerea
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Ungvari
authors.forename: Gabor
authors.initials: G
authors.lastname: Veress
mesh_terms: D000328:Adult; D000368:Aged; D001241:Aspirin / Q000494:pharmacology*; D004351:Drug Resistance; D005260:Female; D006331:Heart Diseases / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D000077185:Resveratrol; D013267:Stilbenes / Q000494:pharmacology*
chemical_list: D010975:Platelet Aggregation Inhibitors; D013267:Stilbenes; D000077185:Resveratrol; D001241:Aspirin