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     <dc:title xml:lang="fr">Étude du rôle de la signalisation IL-2 dans l'activation et la différenciation des lymphocytes B in vivo chez la souris</dc:title>
     <dcterms:alternative xml:lang="en">Study of the role of IL-2 signaling in the activation and differentiation of B lymphocytes in vivo in mice</dcterms:alternative>
     <dc:subject xml:lang="fr">lymphocyte B</dc:subject><dc:subject xml:lang="fr">plasmocytes</dc:subject><dc:subject xml:lang="fr">différenciation</dc:subject><dc:subject xml:lang="fr">lymphocytes B régulateur</dc:subject><dc:subject xml:lang="fr">modèle murin</dc:subject><dc:subject xml:lang="fr">EAE</dc:subject><dc:subject xml:lang="fr">CLP</dc:subject>
     <dc:subject xml:lang="en">B cell</dc:subject><dc:subject xml:lang="en">plasma cell</dc:subject><dc:subject xml:lang="en">differentiation</dc:subject><dc:subject xml:lang="en">regulatory B cell</dc:subject><dc:subject xml:lang="en">mouse model</dc:subject><dc:subject xml:lang="en">EAE</dc:subject><dc:subject xml:lang="en">CLP</dc:subject>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="069191816">Plasmocytes</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="029791197">Lymphocytes B</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="241293138">Encéphalomyélite auto-immune expérimentale</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Mon projet de thèse s’inscrit dans la thématique générale du laboratoire qui vise à identifier les étapes critiques et molécules clés qui régissent le destin cellulaire des lymphocytes B. Lors d’une réponse immune, l’activation et la différenciation des lymphocytes B dépendent de l’intégration de signaux fournis par le microenvironnement. Parmi ces signaux, on trouve l’interleukine 2 (IL-2), cytokine récemment caractérisée par le laboratoire comme participant à la différenciation des lymphocytes B en plasmocytes in vitro. L’objectif de ma thèse a été d’évaluer le rôle physiologique de la signalisation IL-2 i) sur les réponses B effectrices (différenciation extrafolliculaire et réponse du centre germinatif), ii) sur les réponses B régulatrices (ontogénie et/ou fonctionnalité
des cellules B), à l'aide d'un nouveau modèle murin Il2rb KO généré au laboratoire. Nous montrons que la signalisation IL-2 module la balance B effecteurs/régulateurs (en faveur d’une réponse suppressive) dont l’équilibre est essentiel pour le maintien d’une réponse B protectrice dans le modèle animal de sclérose en plaques, l'encéphalomyélite auto immune expérimentale. En parallèle, mes travaux de thèse m’ont amené à travailler sur la dérégulation des réponses B dans le sepsis induit par ligature et ponction caecale chez la souris.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">My thesis project is part of a general theme of the laboratory that aims to identify the critical steps and key molecules that regulate B cell fate. During an immune response, the activation and differentiation of B cells depend on the integration of signals provided by the microenvironment. Among these signals is interleukin 2 (IL-2), a cytokine recently characterized by the lab as a signal for B cell differentiation into plasma cells in vitro. The objective of my thesis was to evaluate the physiological role of IL-2 signaling i) on effector B cell responses (extrafollicular differentiation and germinal center response), ii) on regulatory B cell responses (ontogeny and/or function of B cells) using a novel mice model, Il2rb KO, generated in the laboratory. We showed that IL-2 signaling modulates the effector/regulatory balance (in favor of a suppressive response), whose hemostasis is essential for the protective B cell response in the animal model of multiple sclerosis. In parallel, my thesis work led me to study the deregulation of B cell responses in sepsis induced with caecal ligation and puncture in mice.</dcterms:abstract>
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       <tef:nom>Gauthier</tef:nom>
       <tef:prenom>Juliette</tef:prenom>
       
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                            <tef:thesis.degree.discipline xml:lang="fr">Immunologie</tef:thesis.degree.discipline>
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