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<dc:title xml:lang="en">Role of salivary gland epithelial cells in the differentiation and activation of T lymphocytes in primary Sjögren's syndrome</dc:title>
<dcterms:alternative xml:lang="fr">Etude du rôle des cellules épithéliales des glandes salivaires dans la différenciation et l'activation des lymphocytes T au cours du Syndrome de Sjögren primitif</dcterms:alternative>
<dc:subject xml:lang="fr">Syndrome de Sjögren primitif</dc:subject>
<dc:subject xml:lang="fr">Cellules épithéliales salivaires</dc:subject>
<dc:subject xml:lang="fr">Lymphocytes T folliculaires</dc:subject>
<dc:subject xml:lang="fr">OX40/OX40L</dc:subject>
<dc:subject xml:lang="en">Primary Sjögren's syndrome</dc:subject>
<dc:subject xml:lang="en">Salivary gland epithelial cells</dc:subject>
<dc:subject xml:lang="en">Follicular helper T cells</dc:subject>
<dc:subject xml:lang="en">OX40/OX40L</dc:subject>
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<tef:elementdEntree autoriteExterne="027457877" autoriteSource="Sudoc">Maladies des glandes salivaires</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le syndrome de Sjögren primitif (SJp) est une pathologie auto-immune caractérisée par une sécheresse occulobuccale, un infiltrat lymphocytaire des glandes salivaires, ainsi qu'une production d'auto-anticorps. Les cellules épithéliales salivaires (SGEC) des patients atteints de SSp expriment les molécules impliquées dans les réponses immunitaires et jouent le rôle des cellules présentatrices d’antigènes. Les lymphocytes T folliculaires (LTf) jouent un rôle important en activant les lymphocytes B via la sécrétion d’interleukine (IL)-21. Une augmentation de la proportion de LTf est observée dans le sang des patients ayant un SJp. Nous avons fait l’hypothèse que les SGECs des patients pouvaient induire la différenciation des lymphocytes T naïfs (LTn) en LTf. Nous avons montré que les SGECs sont capables d’induire la différenciation des LTn en LTf via des facteurs solubles tel l’IL-6. La sécrétion d’IL-21 par les LTf nécessite un contact cellulaire impliquant en partie ICOSL.La voie de costimulation OX40/OX40L est impliquée dans plusieurs maladies autoimmunes. Les polymorphismes d’OX40L sont une prédisposent au SJp. Nous avons étudié le rôle pathogène de la voie OX40/OX40L chez les patients SJp. Notre résultats ont montrés une surexpression d’OX40L et d’OX40 dans les glandes salivaires des patients atteint de SJp. Les cocultures des LTn avec les SS SGECs ou contrôle SGECs augmentent l'expression d’OX40 par les LT. Les SS SGECs favorisent la survie et la prolifération des LT via la voie d’OX40/OX40L. Ces résultats démontrent l'implication d’OX40 et d’OX40L dans la pathogénie du SJp et confirment le rôle important des SGECs dans l’épithelite auto-immune du SJp.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The primary Sjögren's syndrome (pSS) is an autoimmune disease characterized by dry mouth and dry eyes. Salivary gland epithelial cells (SGECs) of patients with pSS express the molecules involved in immune responses and act as antigen presenting cells. Follicular helper T cells (Tfh) secrete IL-21 whose augmented secretion is a hallmark of several autoimmunediseases. Here we investigated whether SGECs were capable to induce Tfh differentiation. We report that IL-6 and ICOSL expression by SGECs contributes to naïve CD4+ T differentiation into Tfh cells, as evidenced by their acquisition of a specific phenotype, characterized by Bcl-6, ICOS and CXCR5 expression and IL-21 secretion, but also but by their main functional feature: the capacity to enhance B lymphocytes survival. OX40/OX40L interaction is a pivotal costimulatory pathway. Polymorphisms of OX40L are involved in the genetic predisposition to pSS. We therefore investigated the pathogenic role of OX40/OX40L pathway in pSS. We demonstrated that the proportion of circulating CD4+ T cells expressing OX40 was elevated in patients with pSS and correlated with systemic disease activity. In salivary glands of patients with pSS, epithelial cells overexpressed OX40L and the expression of OX40L and OX40 was respectively evidenced on infiltrating B and T cells. Coculture of T cells with SGECs increased the expression of OX40 by CD4+ T cells promoted T cell survival and proliferation through OX40/OX40L interaction. These studies demonstrate emphasizes unknown pathogenic roles of SGECs and suggests that Tfh, IL-21 and OX40L might be therapeutic targets in pSS.</dcterms:abstract>
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