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<dc:title xml:lang="fr">Étude de la transition endothélio-mésenchymateuse des cellules endothéliales intra-insulaires de souris et modulation pharmacologique : intérêt dans la greffe d'îlots pancréatiques</dc:title>
<dcterms:alternative xml:lang="en">Study of the endothelial-mesenchymal transition of murine intra-insular endothelial cells and pharmacological modulation : interest in pancreatic islet transplantation</dcterms:alternative>
<dc:subject xml:lang="fr">EndTM</dc:subject>
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<dcterms:abstract xml:lang="fr">La revascularisation des îlots greffés est déterminante pour le succès de la greffe. Le contact des îlots avec le sang de la veine porte induit une réaction inflammatoire précoce appelée IBMIR caractérisée par la production de cytokines pro-inflammatoires dans l'environnement des îlots. Une des réponses endothéliales au stress de l'ischémie et de l'IBMIR est la transition endothélio-mésenchymateuse (EndTM). Notre étude réside dans la caractérisation de l'EndTM et dans l’étude de l’effet protecteur du Dulaglutide sur l'endothélium intra-insulaire contre l'EndMT induite par les cytokines de l'IBMIR. Nos données indiquent une diminution progressive des marqueurs endothéliaux et l'acquisition de marqueurs mésenchymateux des cellules endothéliales accompagnée de la libération de microvésicules pro-inflammatoires. Le Dulaglutide exerce une cytoprotection contre les réponses induites par les cytokines de manière GLP-1R dépendante, ainsi que diminue l'effet proinflammatoire cytotoxique des MVs. Le Dulaglutide représente une potentielle thérapie adjuvante pour améliorer l’efficacité de la greffe d’îlots.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Revascularization of the transplanted islets is crucial for the success of the transplant. Islet contact with portalblood induces an early inflammatory response called IBMIR characterized by the production of pro-inflammatory cytokines. One of the endothelial responses to the ischemia and IBMIR is the endothelial-mesenchymal transition (EndMT). Our study lies in the characterization of EndMT and in the investigation of the protective effect of Dulaglutide on the intra-insular endothelium against IBMIR cytokine induced-EndMT. Our data indicate a progressive decrease in endothelial markers and acquisition of mesenchymal markers, accompanied by the release of proinflammatory microvesicles by endothelial cells. Dulaglutide exerts cytoprotection against cytokineinduced responses in a GLP-1R-dependent manner, as well as decreases the cytotoxic proinflammatory effect of MVs. Dulaglutide represents a potential adjuvant therapy to improve the efficacy of islet transplantation.</dcterms:abstract>
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