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<dc:title xml:lang="fr">Caractérisation phénotypique et fonctionnelle du compartiment stromal des organes lymphoïdes au cours du lupus</dc:title>
<dcterms:alternative xml:lang="en">Phenotypic and functional characterization of the stromal compartment in lymphoid organs during systemic lupus erythematosus</dcterms:alternative>
<dc:subject xml:lang="fr">Ganglions lymphatiques</dc:subject>
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<dcterms:abstract xml:lang="fr">Les cellules stromales (CS) constituent l’architecture des organes lymphoïdes secondaires, tels que les ganglions lymphatiques (GL). Elles jouent un rôle essentiel dans le transport des antigènes, la régulation des cellules immunitaires ainsi que la tolérance périphérique. Sur le site d’une inflammation chronique, l’infiltration de cellules immunitaires peut conduire à la formation de structures lymphoïdes ectopiques fonctionnelles appelées Organes Lymphoïdes Tertiaires (OLT). Dans le Lupus Erythémateux Disséminé, une maladie auto-immune systémique, ces OLT participent aux réponses immunitaires locales et sont associés à la néphrite lupique. Cependant, le rôle des CS reste à déterminer dans les GL et les OLT au cours de la pathologie.La caractérisation phénotypique des principales sous-populations de CS, dans les GL drainant les reins des souris NZB/W (modèle murin spontané de lupus), met en lumière le rôle de support de la réponse inflammatoire par le stroma. Nos données obtenues par cytométrie en flux ainsi que par séquençage d’ARN des CS mettent en évidence des modifications quantitatives et qualitatives associées à la maladie. L’analyse des OLT rénaux révèle un compartiment stromal fonctionnel potentiellement impliqué dans le maintien des réponses immunitaires locales. Notre étude présente les CS comme des acteurs de la réponse auto-immune et ouvre la voie vers de nouvelles pistes de recherche fondamentale et thérapeutiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Stromal cells (SC) form the architectural network of secondary lymphoid organs, such as lymph nodes (LN). They play an essential role in antigen transport, immune cell regulation, and peripheral tolerance. At the site of chronic inflammation, immune cell infiltrates can lead to the formation of functional ectopic lymphoid structures called Tertiary Lymphoid Organs (TLO). In Systemic Lupus Erythematosus (SLE) (an autoimmune disease) these TLO participate in local immune responses and are associated with lupus nephritis. However, the role of SC in LN and TLO remains to be elucidated in SLE. The phenotypical characterization of the three major SC subsets in kidney-draining LN in NZB/W mice (a spontaneous mouse model of lupus) highlights the supportive role of SC in the inflammatory response. Flow cytometry analyses and transcriptomic profiles of the SC reveal quantitative and qualitative changes associated with the disease. Analysis of renal TLO shows a functional stromal compartment, potentially involved in the maintenance of local immune responses. Our study depicts SC as contributors to the autoimmune response and paves the way for new fundamental research and therapeutic approaches in SLE.</dcterms:abstract>
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