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<dc:title xml:lang="fr">Voie de signalisation des androgènes, altérations génomiques et 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">Hormonothérapie</dc:subject>
<dc:subject xml:lang="fr">Récepteur des androgènes</dc:subject>
<dc:subject xml:lang="fr">Mutations</dc:subject>
<dc:subject xml:lang="fr">Angiogenèse</dc:subject>
<dc:subject xml:lang="fr">Hétérogénéité tumorale</dc:subject>
<dc:subject xml:lang="en">Prostate cancer</dc:subject>
<dc:subject xml:lang="en">Androgen receptor</dc:subject>
<dc:subject xml:lang="en">Hormone therapy</dc:subject>
<dc:subject xml:lang="en">Mutations</dc:subject>
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<dcterms:abstract xml:lang="fr">La voie de signalisation du récepteur des androgènes (RA) reste une cible thérapeutique privilégiée dans les cancers de la prostate (CaP). Ce travail de thèse a abordé trois thématiques : 1) l’identification et l’étude fonctionnelle des mutations du RA, 2) l’étude du lien existant entre les RA tronqués, résultant de mutations non-sens, et l’angiogenèse tumorale et 3) l’étude exploratoire de l’hétérogénéité tumorale dans les CaP. Au cours de la 1e partie, nous avons identifié 90 mutations du RA à l’aide d’un test fonctionnel chez la levure et émis des hypothèses concernant leur implication dans de potentiels mécanismes de résistance à l’hormonothérapie (HT). La 2e partie nous a permis de montrer un lien entre les variants tronqués et l’expression du VEGF-A, médiateur principal de l’angiogenèse. Enfin dans la dernière partie nous avons étudié, par approche de séquençage à haut-débit, l’hétérogénéité tumorale en fonction du temps et du stade de la maladie. L’ensemble du travail a permis une meilleure connaissance des altérations de la voie de signalisation du RA, leur rôle dans les étapes clés de la progression tumorale et l’évolution des anomalies génomiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The androgen receptor signaling pathway (AR) remains a prime therapeutic target in prostate cancer (PCa). This work focused on three topics: 1) the identification of AR mutations and their functional impact, 2) the assessment of a link between the truncated AR, resulting from nonsense mutations and tumor angiogenesis and 3) an exploratory study of tumor heterogeneity in PCa. In the first part, we identified 90 AR mutations using a yeast-based functional assay and speculated about their involvement in potential mechanisms to hormone therapy (HT) resistance. In the second part we assessed a link between the truncated AR and the overexpression of VEGF-A, the main proangiogenic factor. In the last part we investigated the tumor heterogeneity within the primary tumor and metastasis using a whole exome sequencing approach. This work leads to a better knowledge of the AR signaling pathway alterations, their role in the key steps of tumor progression and the evolution of genomic abnormalities.</dcterms:abstract>
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