Platelet aggregation and flow cytometry analysis of canine platelet rich plasma

Le but de cette etude etait d'evaluer la faisabilite d'une analyse par cytometrie en flux pour etudier les fonctions et l'agregation des plaquettes chez le chien. Pour cela, l'expression de la P-selectine (CD62P) en tant qu'antigene plaquettaire a ete analysee par cytometrie en flux et l'agregation plaquettaire a ete mesuree par une methode turbidimetrique durant l'activation des plaquettes par des doses croissantes (2.5, 7.5 et 10 μM) d'adenosine 5' diphosphate (ADP). L'agregation plaquettaire a ete proportionnelle a la dose utilisee d'ADP et la cytometrie de flux a revele que l'expression membranaire de la P-selectine par les plaquettes augmentait significativement en fonction du temps d'exposition et de la dose d'ADP pour atteindre un plateau au bout de 180 - 300 secondes avec les 2 plus fortes doses d'ADP (7.5 et 10 μM). En parallele, les criteres d'analyse morphologique ont permis d'observer un accroissement de la population de plaquettes activees et/ou sous forme de micro agregats. Par consequent, l'analyse par cytometrie de flux permet effectivement la detection des stades precoces de l'agregation plaquettaire chez le chien.

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