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<dc:title xml:lang="fr">Expression ectopique du gène homéotique Cdx2 dans les pathologies du système digestif</dc:title>
<dcterms:alternative xml:lang="en">Ectopic expression of the homeotic gene Cdx2 in digestive pathologies</dcterms:alternative>
<dc:subject xml:lang="fr">Cdx2</dc:subject>
<dc:subject xml:lang="fr">Métaplasie intestinale</dc:subject>
<dc:subject xml:lang="fr">Cancer</dc:subject>
<dc:subject xml:lang="fr">Trans-différenciation</dc:subject>
<dc:subject xml:lang="en">Cdx2</dc:subject>
<dc:subject xml:lang="en">Intestinal metaplasia</dc:subject>
<dc:subject xml:lang="en">Cancer</dc:subject>
<dc:subject xml:lang="en">Transdifferenciation</dc:subject>
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<tef:elementdEntree autoriteExterne="084173378" autoriteSource="Sudoc">Métaplasie</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="199625220" autoriteSource="Sudoc.FMesh">Facteurs de transcription CDX2</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le facteur de transcription homéotique CDX2 est spécifiquement exprimé dans l’épithélium intestinal où il maintient l’identité, contrôle l’homéostasie et exerce une fonction suppresseur de tumeurs. Chez l’homme, une expression ectopique (hors de l’intestin) de CDX2 peut survenir, dans les métaplasies intestinales d’organes digestifs, considérées comme pré-cancéreuses. Ce travail de thèse visait à étudier les conséquences physiopathologiques de l’expression ectopique de CDX2. Nous avons développé et validé un modèle murin d’induction conditionnelle de CDX2 dans plusieurs organes digestifs. Nos résultats montrent que cette expression est dépendante du contexte cellulaire, et induit des métaplasies intestinales seulement dans l’estomac et le pancréas. Ces métaplasies n’évoluent pas spontanément en cancer. Cependant, CDX2 sensibilise ces lésions métaplasiques à l’apparition de tumeurs intestinales dans l’estomac placé dans un contexte où le gène Apc est muté. Globalement, ces résultats montrent que CDX2 est essentiel au développement de métaplasies intestinales mais n’exercerait pas de fonction oncogénique en situation ectopique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The intestine-specific homeotic transcription factor CDX2 is required throughout life for intestinal homeostasis, the maintenance of intestinal identity and has tumor suppressor activity. In Human, ectopic expression of the gene Cdx2 is observed in several digestive organs as in intestinal metaplasia which is considered as pre-cancerous lesion. This work aimed to investigate the pathophysiological consequences and molecular mechanisms of ectopic expression of CDX2. We created and validated a conditional murine model of CDX2 induction in several digestive organs. Ectopic CDX2 causes intestinal metaplasias only in the stomach and the pancreas which do not spontaneously evolve to cancer, depending on cellular context. However, CDX2 promotes intestinal carcinogenesis in complete intestinal metaplasia of the stomach. Collectively, these results show that CDX2 is essential for the development of intestinal metaplasia but has no oncogenic function in ectopic situation.</dcterms:abstract>
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