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<dc:title xml:lang="en">Role of receptor activator of NF-kB ligand (RANKL) in adult lymph node homeostasis and identification of inhibitors</dc:title>
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<dc:subject xml:lang="fr">Ganglion lymphatique</dc:subject>
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<tef:elementdEntree autoriteExterne="114609519" autoriteSource="Sudoc">Ligand de RANK</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="114609527" autoriteSource="Sudoc.FMesh">Récepteur activateur du facteur nucléaire Kappa B</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le récepteur activateur de NF-κB (RANK), membre de la famille des récepteurs au TNF, est connu pour son rôle dans l’homéostasie de l’os, mais joue aussi un rôle important dans le système immunitaire. J’ai tout d’abord étudié des outils permettant de cibler RANK/RANKL. J’ai caractérisé et comparé l’activité biologique de deux anticorps anti-RANK. J’ai également criblé une librairie de petites molécules pour identifier des inhibiteurs de l’interaction RANK/RANKL. Dans une deuxième partie, je me suis intéressée au rôle du ligand de RANK (RANKL) dans l’homéostasie du ganglion lymphatique. RANKL joue un rôle dans la différenciation des ostéoclastes mais son rôle dans la différenciation d’autres macrophages n’a pas été étudié. Nous avons étudié des souris déficientes pour RANKL dans les cellules marginales réticulaires (MRC) qui expriment RANKL de manière constitutive dans le ganglion adulte. Nous avons observé une diminution de la population de macrophages sous-capsulaires (SSM). Nous avons également montré que les cellules endothéliales lymphatiques (LEC) expriment l’intégrine alpha 2b (ITGA2b) et que cette expression est sensible à la présence de RANKL.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The TNF-family member Receptor Activator of NF-κB (RANK) is known for its role in bone homeostasis and is increasingly recognized as a central player in immune regulation. Firstly I looked for new molecular tools to target RANK/RANKL axis. I characterized and compared the biological activity of two anti-RANK antibodies. Moreover, I screened the Prestwick Chemical Library® of small molecules in order to identify inhibitors of RANK/RANKL interaction. Secondly, I studied the effect of the RANK/RANKL axis in lymph node homeostasis. RANKL is known to promote osteoclast differentiation but whether it also plays a role in the differentiation of other macrophage subsets is not known. We addressed this question by conditionally deleting RANKL from marginal reticular stromal cells (MRCs) that constitutively express RANKL in the lymph node. We observed impaired differentiation of the subcapsular sinus macrophages (SSMs). We also studied lymph node lymphatic endothelial cells (LECs) and showed that integrin alpha 2b (ITGA2b) is expressed by a lymph node subset of LECs and its expression is sensitive to RANKL.</dcterms:abstract>
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