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<dc:title xml:lang="fr">Sénescence, remodelage tissulaire et membranaire, risque thrombotique au cours de la fibrillation auriculaire</dc:title>
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<dc:subject xml:lang="fr">Fibrillation atriale</dc:subject>
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<dc:subject xml:lang="en">Thrombogenicity</dc:subject>
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<dcterms:abstract xml:lang="fr">Nos travaux montrent qu’au cours de la fibrillation atriale (FA), les microparticules (MP) reflètent et contribuent à un état d’hypercoagulabilité et pro-inflammatoire. Leurs concentrations similaires dans les deux oreillettes de patients en FA témoignent d’une absence de différence de statut pro-thrombotique entre ces deux cavités cardiaques. Au cours des procédures d’ablation de FA, les concentrations de MP évoluent parallèlement à l’augmentation de l’activation cellulaire et plaquettaire. Nous avons également montré dans l'altération tissulaire des oreillettes en FA, l'importance de la sénescence qui évolue avec la progression du trouble du rythme. Nous avons caractérisé un modèle cellulaire de sénescence réplicative de cellules endothéliales auriculaires de porc permettant d'identifier l'apparition d'un phénotype pro-thrombotique, pro-inflammatoire, pro-adhésif et de mieux comprendre la physiologie de la cellule endothéliale atriale sénescente et le rôle majeur du système rénine-angiotensine dans ces mécanismes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Our data evidence that during atrial fibrillation (AF), microparticles (MP) contribute to an enhanced hypercoagulable and pro-inflammatory state. Similar concentrations of MP measured in left and right atria of AF patients highlight the absence of chamber-specific enhanced thrombogenic status. During AF ablation procedures, MP concentrations progress in parallel with cell and platelet activation. We also showed that AF progression is strongly related to human atrial senescence burden pointing toward a possible network that links in human atrium, senescence burden, endothelial dysfunction, thrombogenicity and atrial remodeling. We also developed a model of left atrium endothelial cell replicative senescence providing compelling evidences indicating that atrial endothelial senescence promotes thrombogenicity, inflammation and proteolysis. These data underline the major role of renin-angiotensin system in endothelial atrial cell senescence.</dcterms:abstract>
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