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<dc:title xml:lang="fr">Mécanismes physiopathologiques des manifestations auto-immunes au cours de la leucémie lymphoïde chronique : rôle de ZAP-70</dc:title>
<dcterms:alternative xml:lang="en">Autoimmune phenomena pathogenesis in chronic lymphocytic leukemia : the role of ZAP-70</dcterms:alternative>
<dc:subject xml:lang="fr">Leucémie lymphoïde chronique</dc:subject>
<dc:subject xml:lang="fr">Cytopénie auto-immune</dc:subject>
<dc:subject xml:lang="fr">ZAP-70</dc:subject>
<dc:subject xml:lang="fr">Lymphocyte B</dc:subject>
<dc:subject xml:lang="en">Chronic lymphocytic leukemia</dc:subject>
<dc:subject xml:lang="en">Autoimmune cytopenia</dc:subject>
<dc:subject xml:lang="en">ZAP-70</dc:subject>
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<tef:elementdEntree autoriteExterne="028213173" autoriteSource="Sudoc">Autoimmunité</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029791197" autoriteSource="Sudoc">Lymphocytes B</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="032681151" autoriteSource="Sudoc">Tyrosine kinases</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="040734811" autoriteSource="Sudoc.FMesh">Syndromes lymphoprolifératifs</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La leucémie lymphoïde chronique (LLC) est particulièrement associée aux cytopénies auto-immunes (AIC). L’expression de ZAP-70 dans la LLC est un facteur pronostique,due à une forte signalisation par le BCR. Nous décrivons une nouvelle population B normale (LyBn) qui exprime ZAP-70. Ces LyBn ZAP-70+ ne semble pas appartenir à une sous-population LyB particulière, et elles n’ont pas un phénotype activé. L’expression de ZAP-70 dans les LyB naïves suggère que ce phénomène est précoce. Il y a une bonne corrélation dans le niveau de ZAP-70 entre les LyBn et les LyB de LLC. Les LyBn ZAP-70+ ont été retrouvé dans tous les cas de AIC associée à la LLC.L’analyse des anticorps monoclonaux prévenant de LyB ZAP-70+ et des souris ZAP-70KI, réalisés pendant ce travail, définiront les conséquences de la surexpression de ZAP-70 dans les LyB dans la pathogénèse de l’auto-immunité et de la lymphoprolifération.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Chronic lymphocytic leukemia (CLL) is particularly associated with autoimmune cytopenia (AIC). The expression of ZAP-70 in CLL cells is a prognostic factor, through increased BCR signaling. We described a novel normal B cell population (LyBn) that expresses ZAP-70. ZAP-70+ LyBn do not seem to belong to a certain subset of B cells, nor seem to have an activated phenotype. The presence of ZAP-70 in the naïve B cell subset suggests that this is an early process, which probably occurs before malignant transformation. There is a good correlation in the level of ZAP-70 expression, between normal B cells and CLL B cells. We found a significant percentage of ZAP-70+ LyBn in all AIC-associated CLLs. Analysis of monoclonal antibodies and of conditional ZAP-70KI mouse model synthesized in this work will clarify the consequences of aberrant ZAP-70 expression in B cells on autoimmunity and lymphoproliferation.</dcterms:abstract>
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