title: Influence of vitamin E on the antiplatelet effect of acetylsalicylic acid in human blood.
abstract: We analysed the in vitro interaction between acetylsalicylic acid and vitamin E on the principal antiplatelet sites of action of acetylsalicylic acid, i.e., platelet aggregation, prostanoid production in platelets and leukocytes, and nitric oxide synthesis. Aggregation was measured in whole blood and in platelet-rich plasma (PRP) with ADP, collagen or arachidonic acid as platelet inducers, and we measured the production of thromboxane B2, prostacyclin and nitric oxide. Vitamin E potentiated the antiplatelet effect of acetylsalicylic acid in both whole blood and PRP. In PRP induced with collagen the IC50 for acetylsalicylic acid alone was 339+/-11.26, and that of acetylsalicylic acid+vitamin E was 0.89+/-0.09 (P<0.05). Vitamin E did not enhance inhibition of platelet thromboxane production by acetylsalicylic acid. Vitamin E spared or even increased prostacyclin levels, and acetylsalicylic acid+vitamin E diminished the inhibition of prostacyclin synthesis by acetylsalicylic acid (IC50 acetylsalicylic acid alone=1.81+/-0.15 microM; IC50 acetylsalicylic acid+vitamin E= 12.92+/-1.10 microM, P<0.05). Vitamin E increased the effect of acetylsalicylic acid on neutrophil nitric oxide production 42-fold (P<0.05). We conclude that vitamin E potentiates the antiplatelet effect of acetylsalicylic acid in vitro, and thus merits further research in ex vivo studies.
authors: Department of Pharmacology and Therapeutics, School of Medecine, University of Málaga, Campus de Teatinos s/n, Málaga, Spain.
authors: J A
authors: JA
authors: González-Correa
authors: M M
authors: MM
authors: Arrebola
authors: A
authors: A
authors: Guerrero
authors: J
authors: J
authors: Muñoz-Marín
authors: D
authors: D
authors: Ruiz-Villafranca
authors: F
authors: F
authors: Sánchez de La Cuesta
authors: J P
authors: JP
authors: De La Cruz
mesh_terms: D000328:Adult; D016718:Arachidonic Acid / Q000494:pharmacology; D001241:Aspirin / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism; D002478:Cells, Cultured; D003094:Collagen / Q000494:pharmacology; D004357:Drug Synergism; D011464:Epoprostenol / Q000096:biosynthesis; D006801:Humans; D020128:Inhibitory Concentration 50; D007962:Leukocytes / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000096:biosynthesis; D010974:Platelet Aggregation; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D011453:Prostaglandins / Q000096:biosynthesis; D013929:Thromboxane B2 / Q000096:biosynthesis; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D010975:Platelet Aggregation Inhibitors; D011453:Prostaglandins; D014810:Vitamin E; D016718:Arachidonic Acid; D009569:Nitric Oxide; D013929:Thromboxane B2; D003094:Collagen; D011464:Epoprostenol; D001241:Aspirin