INTRODUCTION: This study aimed to characterize the in vitro effect of EV-077, a compound that antagonises the binding of prostanoids and isoprostanes to the thromboxane receptor (TP) and inhibits the thromboxane synthase (TS), on platelet aggregation of patients with type-2 diabetes and coronary artery disease (CAD) on chronic aspirin treatment. The effect of EV-077 on 8-iso-PGE(2)-mediated TP receptor contraction of human arteries was also investigated. MATERIALS AND METHODS: Fifty-two type-2 diabetics with CAD on chronic aspirin (100mg) treatment were studied. Arachidonic acid-induced platelet aggregation was measured by impedance aggregometry in platelet-rich plasma (PRP) and whole blood anticoagulated with hirudin, and by light transmission aggregometry in citrate-anticoagulated PRP following 10-min in vitro exposure to EV-077 (100nmol/l) or control. The effect of EV-077 was measured on isometric contraction of 24 human umbilical arteries induced by isoprostane 8-iso-PGE(2). RESULTS: Arachidonic acid (1mmol/l) induced substantial aggregation in hirudin-anticoagulated whole blood (63±4AU), which was significantly reduced by in vitro exposure to EV-077 (38±3AU, P<0.001). Virtually no arachidonic acid-induced aggregation in citrate-anticoagulated or hirudin-anticoagulated PRP was observed. EV-077 potently, competitively and reversibly inhibited TP mediated contraction of umbilical arteries by 8-iso-PGE(2) (P<0.01). CONCLUSIONS: Aspirin did not completely inhibit arachidonic acid-induced platelet aggregation in whole blood from type-2 diabetics with CAD. This aggregation is likely induced by prostanoids and/or isoprostanes produced by leukocytes, because it was significantly reduced by EV-077. The TP receptor-mediated contraction of human arteries induced by isoprostane 8-iso-PGE(2) was effectively inhibited by EV-077.
EV-077 in vitro inhibits platelet aggregation in type-2 diabetics on aspirin / K.S. Sakariassen, E.A. Femia, F.M. Daray, G.M. Podda, C. Razzari, M. Pugliano, A.E. Errasti, A.R. Armesto, W. Nowak, P. Alberts, J. Meyer, A.S. Sorensen, M. Cattaneo, R P. Rothlin. - In: THROMBOSIS RESEARCH. - ISSN 0049-3848. - 130:5(2012 Nov), pp. 746-752.
|Titolo:||EV-077 in vitro inhibits platelet aggregation in type-2 diabetics on aspirin|
FEMIA, ETI ALESSANDRA (Secondo)
CATTANEO, MARCO NATALE (Penultimo)
|Parole Chiave:||Arterial contraction; Isoprostane 8-iso-PGE2; Platelet aggregation; Prostanoids; Thromboxane receptor (TP); Thromboxane synthase (TS)|
|Settore Scientifico Disciplinare:||Settore MED/09 - Medicina Interna|
|Data di pubblicazione:||nov-2012|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.thromres.2012.08.309|
|Appare nelle tipologie:||01 - Articolo su periodico|