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<dc:title xml:lang="en">Study of interactions between endocrine and exocrine pancreas mediated by microparticles in cystic fibrosis : impact of infections and immunosuppressive drugs</dc:title>
<dcterms:alternative xml:lang="fr">Etude des interactions entre le pancréas endocrine et exocrine promus par les microparticules dans la mucoviscidose : impact des infections et des immunosuppresseurs</dcterms:alternative>
<dc:subject xml:lang="fr">Mucoviscidose</dc:subject>
<dc:subject xml:lang="fr">Inflammation</dc:subject>
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<dc:subject xml:lang="fr">Pancréas exocrine et endocrine</dc:subject>
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<dc:subject xml:lang="fr">Senescence</dc:subject>
<dc:subject xml:lang="fr">Apoptose</dc:subject>
<dc:subject xml:lang="en">Cystic fibrosis</dc:subject>
<dc:subject xml:lang="en">Inflammation</dc:subject>
<dc:subject xml:lang="en">Cystic fibrosis-related diabetes</dc:subject>
<dc:subject xml:lang="en">Exocrine and endocrine pancreas</dc:subject>
<dc:subject xml:lang="en">Microparticles</dc:subject>
<dc:subject xml:lang="en">Immunosuppressive drugs</dc:subject>
<dc:subject xml:lang="en">Senescence</dc:subject>
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<dcterms:abstract xml:lang="fr">Ce travail scientifique a abordé la problématique de la communication cellulaire entre le pancréas exocrine et endocrine dans la mucoviscidose. La contribution des infections pulmonaires chroniques et des traitements immunosuppresseurs sur la dégénerescence pancréatique a été aussi étudiée. Les résultats obtenus ont montré que le LPS disséminé par des infections récurrentes peut cibler les cellules pancréatiques exocrines, en conduisant à la formation des microparticules membranaires qui sont nuisibles pour la survie et le fonctionnement des cellules endocrines. Dans cette communication intercellulaire, la protéine CFTR est un médiateur essentiel de la sévérité des signaux délivrés par les microparticules et de la réponse cellulaire à l'inflammation du pancréas, en participant à l'équilibre de la sécrétion d'insuline des cellules endocrines. En outre, les données ont mis en évidence que l'administration prolongée d’immunosuppresseurs chez les patients greffés pourrait différemment induire l'apoptose de manière dépendante de la mitochondrie, cela en favorisant l'entrée des cellules en sénescence prématurée, un état métabolique du dysfonctionnement cellulaire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This scientific work tackled the issue of the communication between exocrine and endocrine pancreas in cystic fibrosis. Also, the contribution of recurrent lung infections and immunosuppressive therapy to the pancreatic cell degenerescence was studied in vitro. Results obtained showed that disseminated LPS released by recurrent infections could target pancreatic exocrine cells, leading to the formation of membrane microparticles that are deleterious for endocrine cell survival and function. In this intercellular cross-talk, CFTR is a critical mediator for the severity of the MP-delivered signals and for the pancreatic cell response to inflammation, also participating to the balance of insulin secretion of endocrine cells. Furthermore, data evidenced that long-term administration of immunosuppressive drugs in grafted patients may differently induce apoptosis in a mitochondrial-dependent fashion, possibly favoring cells to enter premature senescence, which is a metabolic state of cellular dysfunction.</dcterms:abstract>
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