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<dc:title xml:lang="fr">Le Cluster Mir-17-92, rôle dans la régulation de la réponse inflammatoire au cours de la polyarthrite rhumatoïde</dc:title>
<dcterms:alternative xml:lang="en">The cluster Mir-17-92, role in the regulation of inflammatory response in rheumatoid arthritis</dcterms:alternative>
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<dc:subject xml:lang="fr">Immunité innée</dc:subject>
<dc:subject xml:lang="fr">Toll-like receptor</dc:subject>
<dc:subject xml:lang="fr">Polyarthrite rhumatoïde</dc:subject>
<dc:subject xml:lang="fr">Synoviocytes</dc:subject>
<dc:subject xml:lang="fr">Régulation</dc:subject>
<dc:subject xml:lang="fr">Cluster miR-17~92</dc:subject>
<dc:subject xml:lang="fr">Réponse inflammatoire</dc:subject>
<dc:subject xml:lang="en">Rheumatoid arthritis</dc:subject>
<dc:subject xml:lang="en">Autoimmune disease</dc:subject>
<dc:subject xml:lang="en">MiRNA</dc:subject>
<dc:subject xml:lang="en">Toll-like receptor</dc:subject>
<dc:subject xml:lang="en">Fibroblast-like synoviocytes</dc:subject>
<dc:subject xml:lang="en">Cluster miR-17~92</dc:subject>
<dc:subject xml:lang="en">Inflammatory response</dc:subject>
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<dcterms:abstract xml:lang="fr">La polyarthrite rhumatoïde (PR) est la maladie auto-immune la plus fréquente d’une prévalence de 1%. Les cellules résidentes de la cavité synoviale, les fibroblast-like synoviocytes (FLS), sont des acteurs majeurs de la PR. Leur activation par des récepteurs de l’immunité innée participe à l’acquisition d’un phénotype agressif menant à la destruction ostéo-articulaire. Dans cette étude, nous avons évalué le rôle régulateur de miARN sur les voies de signalisation des Toll-like receptors (TLR). L’activation de TLR2 et de TLR4 dans les FLS induit la diminution de l’expression de plusieurs miARN, dont miR-19a et b (miR-19), alors que TLR2 est surexprimé. Nous avons pu ainsi montrer que miR-19 régule Tlr2 et que la transfection de mir-19 dans les FLS activés induit une diminution de l’expression de TLR2 et de la synthèse d’IL-6 et de MMP-3. Mir-19 appartient au cluster miR-17~92, dont l’expression est abaissée dans les FLS. Il code pour 6 miARN dont miR-20a. miR-20a est également sous-régulé après activation de TLR2 et TLR4 dans les FLS et les THP-1. Nous avons montré que miR-20a régule directement l’expression d’Ask1, impliquée et surexprimée après activation de TLR4. La transfection de miR-20a in vitro nous a permis de montrer que miR-20a contrôle l’expression d’ASK1 et induit une inhibition de la synthèse de cytokines majeures de la PR dans les FLS et les THP-1. Des résultats équivalents ont été obtenus ex vivo chez la souris. Ces travaux ont permis d’identifier dans les FLS rhumatoïdes des miARN anti-inflammatoires dont la baisse d’expression permet une augmentation de l’expression de TLR2 et d’ASK1. Ces miARN pourraient donc constituer de nouvelles cibles thérapeutiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Rheumatoid arthritis (RA) is the most frequently autoimmune disease with a prevalence of 1%. Resident cells of joints, the fibroblast-like synoviocytes (FLS), act as key players in RA. Their activation through Pattern-recognition receptors leads to an aggressive phenotype, leading in the osteo-articular destruction of the joints. In this study, we aimed to discuss the link between Toll-like receptors (TLR) and miRNA pathway. We established the down-regulation of a few miRNA when FLS were activated through TLR2 and TLR4, including miR-19a and miR-19b (miR-19). We showed that miR-19 regulates directly Tlr2 and that transfection of miR-19 mimics leads to a decrease of IL-6 and MMP-3 synthesis in FLS. miR-19 belongs to the cluster miR-17~92, which is also down-regulated in activated FLS. This primary transcript encodes for 6 miRNA, including miR-20a, which is also down regulated upon TLR2 and TLR4 activation in FLS and further in THP-1, a monocyte cell-line. Then, we validated the predicted regulation of miR-20a on Ask1, an important kinase involved in TLR4 pathway. The transfection of miR-20a mimics in vitro represses ASK1 expression and inhibits several major cytokines in RA both in FLS and THP-1. Further, we confirmed these results on ex vivo experiments on peritoneal macrophages. These works allowed us to identify new anti-inflammatory miRNA that are downregulated and allow overexpression of TLR2 and ASK1 in RA FLS. These results open new experiments on in vivo models. All together, these data give new insights for identify new therapeutics in RA.</dcterms:abstract>
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