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<dc:title xml:lang="en">Role of RANKL in the differentiation of B cell associated stroma in secondary lymphoid organs</dc:title>
<dcterms:alternative xml:lang="fr">Rôle de RANKL dans la différenciation du stroma associé aux lymphocytes B dans les organes lymphoïdes secondaires</dcterms:alternative>
<dc:subject xml:lang="fr">RANKL</dc:subject>
<dc:subject xml:lang="fr">Ganglion lymphatique</dc:subject>
<dc:subject xml:lang="fr">MRC</dc:subject>
<dc:subject xml:lang="fr">Follicule B</dc:subject>
<dc:subject xml:lang="fr">CXCL13</dc:subject>
<dc:subject xml:lang="fr">TNFR1</dc:subject>
<dc:subject xml:lang="en">RANKL</dc:subject>
<dc:subject xml:lang="en">Lymph node</dc:subject>
<dc:subject xml:lang="en">MRC</dc:subject>
<dc:subject xml:lang="en">B cell follicle</dc:subject>
<dc:subject xml:lang="en">CXCL13</dc:subject>
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<tef:elementdEntree autoriteExterne="178143057" autoriteSource="Sudoc">RANKL</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029791197" autoriteSource="Sudoc">Lymphocytes B</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="040734706" autoriteSource="Sudoc">Tissu lymphoïde</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">RANKL (ligand du récepteur activateur de NF-KB) est un membre de la famille des TNF dont la signalisation passe par RANK et qui joue un rôle important dans la régulation immunitaire. Chez l'adulte, RANKL est exprimé constitutivement par des cellules réticulaires marginales (MRC) des ganglions lymphatiques. Comme les MRCs sont physiquement proches des lymphocytes B (LB) et ont été proposé d’être des précurseurs de cellules dendritiques folliculaires (FDC), RANKL pourrait jouer un rôle dans la différenciation du stroma associé aux LB et dans la réponse humorale. Afin de mieux comprendre la fonction de RANKL exprimé par les MRC, nous avons généré des souris déficitaires pour RANKL dans les cellules stromales. Nous avons constaté que la formation du follicule B était perturbée ainsi que le réseau FDC. Bien que RANKL ne soit pas requis pour la formation des MRC, il est nécessaire pour l'expression de la chimiokine CXCL13 par ces mêmes cellules. Parmi les TNFRSF dont la signalisation est requise pour l’expression de CXCL13 et la différenciation des FDC, le TNFR1 était significativement réduit dans les cellules stromales des souris dépourvues de RANKL stromal. Ainsi, RANKL pourrait constituer une nouvelle cible thérapeutique contre les immunopathologies des LB en agissant sur son stroma.</dcterms:abstract>
<dcterms:abstract xml:lang="en">RANKL (receptor activator of NF-κB ligand), a member of the TNF family that signals via RANK, plays an important role for immune regulation. In the adult, RANKL is constitutively expressed by marginal reticular cells (MRCs) of the lymph nodes. Because MRCs are positioned in close vicinity to B cells and may be precursors of follicular dendritic cells (FDCs), RANKL could play a role in the differentiation of B cell-associated stroma and the humoral immune response. In order to better understand the role of RANKL expressed by the MRCs, we generated mice with conditional RANKL deficiency in the stromal compartment. We found that the B cell follicle structure was disrupted and FDC network formation was reduced. Although RANKL was not required for MRC formation, it was necessary for the expression of B cell attracting chemokine CXCL13. Among the TNFRSF members known to control CXCL13 expression and FDC formation, we found that TNFR1 was significantly reduced in the RANKL cKO mice. Thus, RANKL may present a novel therapeutic strategy against B cell-mediated immunopathologies by acting on its stroma.</dcterms:abstract>
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