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<dc:title xml:lang="en">Impact of empagliflozin on endothelial dysfunction and impaired myocardial contractility in Takotsubo Syndrome (catecholamine-induced myocardial stunning) : role of the SGLT2/NADPH oxidase pathway</dc:title>
<dcterms:alternative xml:lang="fr">Impact de l'empagliflozine sur le dysfonctionnement endothélial et l'altération de la contractilité myocardique dans le syndrome de Takotsubo (Sidération myocardique induite par les catécholamines) : rôle de la voie SGLT2/NADPH oxydase</dcterms:alternative>
<dc:subject xml:lang="fr">Syndrome de Takotsubo</dc:subject>
<dc:subject xml:lang="fr">Empagliflozine</dc:subject>
<dc:subject xml:lang="fr">SGLT2</dc:subject>
<dc:subject xml:lang="fr">Stress oxydatif</dc:subject>
<dc:subject xml:lang="fr">Dysfonction endothélial</dc:subject>
<dc:subject xml:lang="fr">Inflammation</dc:subject>
<dc:subject xml:lang="fr">NADPH oxydase</dc:subject>
<dc:subject xml:lang="fr">Cardiomyopathie induite par le stress</dc:subject>
<dc:subject xml:lang="en">Takotsubo syndrome</dc:subject>
<dc:subject xml:lang="en">Empagliflozin</dc:subject>
<dc:subject xml:lang="en">SGLT2</dc:subject>
<dc:subject xml:lang="en">Oxidative stress</dc:subject>
<dc:subject xml:lang="en">Endothelial dysfunction</dc:subject>
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<dc:subject xml:lang="en">NADPH oxidase</dc:subject>
<dc:subject xml:lang="en">Stress-induced cardiomyopathy</dc:subject>
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<dcterms:abstract xml:lang="fr">Le syndrome de Takotsubo (STT) est une cardiomyopathie aiguë induite par le stress, associée à un dysfonctionnement myocardique transitoire, au stress oxydatif, à l’inflammation et au dysfonctionnement endothélial. Cette étude a évalué les effets cardioprotecteurs de l’empagliflozine, un inhibiteur du SGLT2, dans un modèle expérimental de STT induit par l’isoprotérénol chez le rat, ainsi que dans des approches translationnelles ex vivo utilisant du plasma de patients atteints de STT. L’isoprotérénol a provoqué une altération de la fonction cardiaque, une augmentation du stress oxydatif, de l’inflammation et du remodelage pro-fibrotique, particulièrement au niveau apical du ventricule gauche. Le prétraitement par empagliflozine a amélioré la fonction cardiaque, réduit la production d’espèces réactives de l’oxygène, diminué l’inflammation et préservé la fonction endothéliale. Ces résultats suggèrent que l’inhibition du SGLT2 pourrait représenter une stratégie thérapeutique prometteuse dans le syndrome de Takotsubo.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Takotsubo syndrome (TTS) is an acute stress-induced cardiomyopathy characterized by transient left ventricular dysfunction associated with oxidative stress, inflammation, and endothelial dysfunction. This study investigated the cardioprotective effects of empagliflozin, an SGLT2 inhibitor, in an isoproterenol-induced rat model of TTS and in ex vivo translational experiments using plasma from patients with acute TTS. Isoproterenol induced systolic and diastolic dysfunction, increased oxidative stress, inflammation, endothelial activation, and pro-fibrotic remodeling, predominantly in the apical region of the left ventricle. Empagliflozin pre-treatment improved cardiac function, preserved endothelial and microvascular function, reduced reactive oxygen species production, attenuated inflammatory and pro-fibrotic signaling, and decreased macrophage infiltration. Mechanistic analyses identified the AT1R/NADPH oxidase/SGLT2 pathway, mitochondrial dysfunction, and inflammatory signaling as key contributors to myocardial injury. These findings suggest that SGLT2 inhibition may represent a promising therapeutic strategy for Takotsubo syndrome by limiting oxidative stress, inflammation, and adverse cardiac remodeling.</dcterms:abstract>
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