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<dc:title xml:lang="fr">Etudes des mécanismes cellulaires et moléculaires de la réponse immunitaire de type 2 dans la dermatite atopique</dc:title>
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<dcterms:abstract xml:lang="fr">Mon travail, lors de ma thèse, avait pour but d’étudier la différentiation des lymphocytes Tfh, ainsi que leur fonction et leur régulation dans la pathogenèse de la DA. Pour cela, j’ai utilisé un modèle murin précédemment établi au sein de notre laboratoire consistant en l’application topique de MC903 (un analogue de la vitamine D3) induisant la production de TSLP par les kératinocytes et, par conséquence, la réponse immunitaire Th2 et la pathogenèse de la DA. mon travail doctoral s’est porté sur la différentiation des lymphocytes Tfh, leur production cytokinique ainsi que la formation des centres germinatifs dans le contexte d’un modèle murin de DA induite par le MC903. Mes études ont démontré un rôle critique joué par TSLP dans la réponse Tfh et ont exploré le rôle potentiellement joué par les cellules dendritiques langerine+ et la signalisation OX40L dans le développement des réponses Tfh et de type 2. Ceci nous a permis d’approfondir nos connaissances concernant les mécanismes sous-tendant la réponse immunitaire de type 2 dans la pathogenèse de la DA. Dans la deuxième partie de ma thèse, nous avons examiné le rôle de MC903 dans la régulation de l’inflammation due au psoriasis, en utilisant un modèle de psoriasis induit par l’Aldara. Nous avons montré que MC903 inhibe l’axe 23/IL-17/IL-22 chez les souris souffrant de psoriasis. De plus, cette inhibition semblait être dose-dépendante. Nous avons en outre exploré le rôle de TSLP et VDR dans la médiation de cet effet dû au MC903.</dcterms:abstract>
<dcterms:abstract xml:lang="en">My thesis aimed at studying the Tfh cell differentiation, function and regulation in AD pathogenesis. To this aim, I employed our previously established AD mouse model in which MC903 (a vitamin D analog) topical treatment on the skin induces TSLP production bykeratinocytes, promotes Th2 cell response and drives the pathogenesis of AD. my thesis work investigated Tfh cell differentiation, its cytokine expression and germinal center formation using MC903-induced AD mouse model. By exploring the role of TSLP,Langerin+ DCs and OX40L signaling in Tfh cell differentiation and regulation, my study provides novel insights into the mechanisms underlying the type 2 immune response in AD pathogenesis. In the second part of my study, we examined the role of MC903 in regulating the psoriatic inflammation using Aldara-induced psoriasis model. We showed that MC903 inhibited IL-23/IL-17/IL-22 axis in mouse psoriasis. Moreover, this inhibition exhibited a dose-dependent manner. We further explored the role of TSLP and VDR in mediating such effect of MC903.</dcterms:abstract>
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