[en] The in vitro inhibitory effect of SR 27417, an antagonist of the platelet-activating factor (PAF) receptor, on PAF-induced platelet aggregation was studied in blood collected from seven healthy Friesien calves. Inhibitory effects of SR 27417 were determined at thirteen different concentrations (0.1-400 nM) by using the dose-response curves of PAF on calf platelet aggregation. In the presence of SR 27417, the maximal slopes of aggregation (%/min) induced by low and high concentrations of PAF were significantly different from the control values obtained without an antagonist at p < or = 0.05 and p < or = 0.01 respectively. In vitro PAF-induced calf platelet aggregation was dose-dependently inhibited by SR 27417. The drug inhibited PAF-induced platelet aggregation in a competitive reversible manner (pA2 = 10.46 +/- 2.36 mol x L(-1)). In conclusion, the results of our study showed that addition of SR 27417 to bovine platelet in vitro inhibits PAF-induced platelet aggregation. [fr] Effet inhibiteur in vitro du SR 27417, un puissant antagoniste du récepteur du facteur d'activation plaquettaire sur l'agrégation des plaquettes induite par le PAF chez le bovin. L'effet inhibiteur in vitro du SR 27417, un antagoniste du récepteur du facteur d'activation plaquettaire (PAF) induite par le PAF sur l'agrégation plaquettaire a été étudiée dans le sang prélevé des sept veaux sains de race Frisonne. L'effet inhibiteur du SR 27417 a été déterminé avec treize concentrations différentes (0,1 - 400 nM) en utilisant les courbes dose-effet du PAF sur l'agrégation plaquettaire des veaux. En présence du SR 27417, la pente d'agrégation maximale de la courbe ( concentrations du PAF ont été significativement différentes des valeurs de base ( et respectivement). L'agrégation des plaquettes induites par le PAF a été inhibée in vitro par le SR 27417 d'une manière dépendante de la dose. Le médicament a inhibé in vitro l'agrégation induite par le PAF des plaquettes chez le bovin de façon compétitive et réversible (pA2 = 10.46 2.36 molL-1). En conclusion, les résultats de notre étude montrent in vitro que l'addition du SR 27417 aux plaquettes chez le bovin inhibe l'agrégation plaquettaire induite par le PAF.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Bastos da Silva, Miriam
Delaunois, Annie ; Université de Liège - ULiège > Faculté de Médecine Vétérinaire > Laboratoire de Pharmacologie et toxicologie
Gustin, Pascal ; Université de Liège - ULiège > Faculté de Médecine Vétérinaire > Laboratoire de Pharmacologie et Toxicologie
Godeau, Jean-Marie ; Université de Liège - ULiège > Faculté de Médecine Vétérinaire > Laboratoire de Biologie Clinique
Lekeux, Pierre ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie
Language :
English
Title :
In Vitro Inhibitory Effect of SR 27417, a Potent Platelet-Activating Factor (PAF) Receptor Antagonist, on the PAF-Induced Bovine Platelet Aggregation
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