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<dc:title xml:lang="fr">Impact des altérations du récepteur des androgènes sur les voies de signalisation liées à la différenciation cellulaire et à la progression du cancer de la prostate</dc:title>
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<dc:subject xml:lang="fr">Cancer de la prostate</dc:subject>
<dc:subject xml:lang="fr">Variants constitutivement actifs du récepteur des androgènes</dc:subject>
<dc:subject xml:lang="fr">Transition Epithélio-Mésenchymateuse (EMT)</dc:subject>
<dc:subject xml:lang="fr">N-cadhérine</dc:subject>
<dc:subject xml:lang="fr">Régulation transcriptionnelle</dc:subject>
<dc:subject xml:lang="en">Prostate cancer (Pca)</dc:subject>
<dc:subject xml:lang="en">Constitutively active androgen receptor variants</dc:subject>
<dc:subject xml:lang="en">Epithelial-Mesenchymal Transition (EMT)</dc:subject>
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<tef:elementdEntree autoriteExterne="192696858" autoriteSource="Sudoc">Transition épithélio-mésenchymateuse</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La voie de signalisation du récepteur des androgènes (RA) est la principale cible thérapeutique des cancers de la prostate métastatiques. Toutefois, l'émergence de variants constitutivement actifs du RA dépourvus de leur partie C-terminale conduit à une résistance au traitement. Pendant ma thèse, j'ai montré que les variants du RA induisent une transition épithélio-mésenchymateuse (EMT) partielle, un phénomène observé lors de la progression tumorale. J'ai ensuite étudié les mécanismes conduisant à cette expression différentielle de marqueurs de l’EMT en me focalisant sur la N-cadhérine (CDH2). Le RA entier (AR-FL) et les variants du RA interagissent tous les deux au niveau des éléments de réponse aux androgènes dans l'intron1 de CDH2. Cependant, une augmentation du niveau d’acétylation des histones est observée uniquement avec les variants du RA. Mes données nous mène à un modèle où l'AR-FL réprimerait l'expression de CDH2 alors que les variants du RA induiraient son expression.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Androgen receptor (AR) pathway is the main therapeutic target for metastatic prostate cancer (Pca).However, the expression of AR variants lacking the carboxy-terminal end lowers therapy efficacy. During myphD, I showed that AR variants induce a partial epithelial-mesenchymal transition (EMT), a phenomenon observed during tumor progression. To understand the mode of action of AR variants, I explored the mechanisms leading to this differential expression of EMT markers focusing my research on N-cadherin(CDH2). While both the full length AR (AR-FL) and AR variants could interact with androgen response elements present in intron 1 of CDH2, I highlighted that they had opposite effects concerning histone modifications. Indeed, increased histone acetylation in this genomic region was observed only in the presence of AR variants. My data lead us to propose a model in which AR-FL represses CDH2 gene, while AR variants favor its expression.</dcterms:abstract>
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