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<dc:title xml:lang="fr">Importance de la voie pro-oxydante AT1R/NADPH oxydase/SGLT1/2 dans les réponses pro-sénescentes, pro-inflammatoires et pro-fibrotiques des cellules endothéliales auriculaires et du tissu atrial humain : rôle potentiel dans la fibrillation auriculaire</dc:title>
<dcterms:alternative xml:lang="en">Importance of the AT1R/NADPH oxidase/SGLT1/2 pro-oxidant pathway in pro-senescent, pro-inflammatory and pro-fibrotic responses of atrial endothelial cells and human atrial tissues : potential role in atrial fibrillation</dcterms:alternative>
<dc:subject xml:lang="fr">Facteurs de coagulation</dc:subject>
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<dc:subject xml:lang="fr">Remodelage</dc:subject>
<dc:subject xml:lang="fr">Co-transporteur sodium-glucose</dc:subject>
<dc:subject xml:lang="fr">Dysfonction endothéliale</dc:subject>
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<dc:subject xml:lang="en">Coagulation factors</dc:subject>
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<dc:subject xml:lang="en">Sodium-glucose co-transporter</dc:subject>
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<dcterms:abstract xml:lang="fr">La fibrillation auriculaire est l'arythmie cardiaque la plus fréquente entraînant des complications cardiovasculaires telles qu'un accident vasculaire cérébral ischémique suite à la formation d'un thrombus dans l'oreillette gauche. Bien que les inhibiteurs du co-transporteur sodium-glucose2 (SGLT2i) aient montré des effets bénéfiques dans l'insuffisance cardiaque, l'expression et le rôle du SGLT2 dans les tissus cardiaques restent mal compris. Cette étude examine si le FXa, un facteur de coagulation, affecte la fonction des cellules endothéliales auriculaires et détermine les mécanismes sous-jacents. De plus, une approche translationnelle a été utilisée pour étudier ces mécanismes dans les appendices auriculaires droit (RAA) et gauche (LAA) chez l'homme. Nos résultats indiquent que le FXa favorise la sénescence et la dysfonction endothéliale favorisant le remodelage et la fibrose. Cet effet implique la voie pro-oxydante AT1R/NADPH oxydases/SGLT1/2. De plus, SGLT1 et 2 sont exprimés dans le RAA avec de faibles niveaux d'eNOS, des réponses pro-inflammatoires, pro-sénescentes et une fibrose. Ils se caractérisent par une augmentation du stress oxydatif activé par le système local de l'angiotensine, SGLT1/2 ou TNF-α. Ces réponses étaient plus élevées dans l'AAG que dans l'AAR, et dans l'AAG distal par rapport à l'AAG proximal.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Atrial fibrillation is the most common cardiac arrhythmia leading to cardiovascular complications such as ischemic stroke following the formation of thrombus in the left atrium. Although sodium-glucose co-transporter2 (SGLT2i) inhibitors have shown beneficial effects in heart failure, the expression and role of SGLT2 in cardiac tissues remain poorly understood. This study investigate whether FXa, a clotting factor, affects atrial endothelial cell function and to determine the underlying mechanisms. In addition, a translational approach was used to study these mechanisms in the right (RAA) and left (LAA) atrial appendages in human. Our results indicate that FXa promotes senescence and endothelial dysfunction promoting remodeling and fibrosis. This effect involves the AT1R/NADPH oxidases/SGLT1/2 pro-oxidant pathway. Furthermore, SGLT1 and 2 are expressed in the RAA with low eNOS levels, pro-inflammatory, pro-senescent responses and fibrosis. They are characterized by increased oxidative stress activated by the local angiotensin system, SGLT1/2 or TNF-α. These responses were higher in the LAA than in the RAA, and in the distal compared to the proximal LAA.</dcterms:abstract>
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