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<dc:title xml:lang="fr">Caractérisation de l'axe intégrine α5β1/protéine p53 dans les gliobastomes humains : application à une thérapie ciblée anti-tumorale</dc:title>
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<dcterms:abstract xml:lang="fr">Les intégrines sont des protéines transmembranaires, formées d’une sous-unité α et d’une sous-unité β, qui sont impliquées dans de nombreuses caractéristiques du cancer. Mes travaux de thèses ont montré que l’axe intégrine α5β1/AKT est impliqué dans la résistance à l’apoptose des cellules de glioblastome et dans leur migration. L’inhibition fonctionnelle de l’intégrine α5β1 associée à la réactivation de p53 sensibilise les cellules de glioblastome à l’apoptose. Mes résultats ont mis en évidence que les protéines anti-apoptotiques PEA-15 et Survivine sont deux intervenants majeurs dans cette résistance à l’apoptose. La migration dépendante de l’intégrine α5β1 implique la β-caténine. Les résultats obtenus par ce travail de thèse, donnent, par conséquent, des arguments supplémentaires en faveur de l’implication de l’intégrine α5β1 dans l’agressivité des glioblastomes. Ces résultats permettent également de proposer de nouvelles cibles thérapeutiques ainsi que des biomarqueurs pertinents pour stratifier les patients potentiellement répondeurs à une stratégie anti-intégrine.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Integrins are αβ membrane localised protein heterodimers involved in numerous hallmarks of cancer. My PhD thesis showed that the integrin α5β1/AKT axis is implicated in glioblastoma cells resistance to apoptosis and migration. The inhibition of α5β1 integrin oncogenic pathway sensitizes glioma cells to p53-reactivation dependent apoptotic cues. My results showed that PEA-15 and Survivin are two anti-apoptotic proteins involved in the resistance to apoptosis. α5β1 integrin dependent migration involves the β-catenin pathway. My results confirm that α5β1 integrin has to be considered as an important player in glioblastoma aggressiveness and resistance to therapy. The results of my thesis also suggest new therapeutic targets and pertinent biomarkers for glioblastoma patient stratification.</dcterms:abstract>
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