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<dc:title xml:lang="fr">Mécanisme et conséquences de la répression de DKK1 par la ténascine-C, une molécule du microenvironnement tumoral</dc:title>
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<dc:subject xml:lang="fr">Ténascine C</dc:subject>
<dc:subject xml:lang="fr">Voie de signalisation Wnt</dc:subject>
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<dc:subject xml:lang="en">Extracellular matrix</dc:subject>
<dc:subject xml:lang="en">Tenascin C</dc:subject>
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<dcterms:abstract xml:lang="fr">La Ténascine-C (TNC) est un composé majeur de la matrice extracellulaire tumorale et sa forte expression est directement corrélée à l’angiogenèse tumorale et au processus métastatique. Lors de ma thèse j’ai pu démontrer que la TNC dérégulait DKK1, un inhibiteur de la voie de signalisation Wnt et par ce biais augmentait l’activité de cette voie impliquée dans la cancérogenèse. La diminution de la formation des fibres de stress en présence de TNC est l’un des mécanismes majeurs qui contribue à la diminution de DKK1. L’activité de MKL1, facteur co-transcriptionnel de SRF et régulable par l’actine, s’avère diminuée en présence de TNC. Mes données indiquent que la fonction de MKL1 n’est peut-être pas le mécanisme majeur de la régulation de DKK1 par la statu de l’actine. D’autres facteurs, probablement liés aux fibres de stress d’actine pourraient être impliqués. L’augmentation de l’activité de la voie de signalisation Wnt, dépendante de DKK1, est probablement le mécanisme majeur par lequel la TNC active la progression tumorale. Cette étude a permis de mettre en évidence un nouveau mécanisme de régulation de DKK1 faisant intervenir l’intégrité du cytosquelette d’actine.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Tenascin-C (TNC) is a major component of the tumor specific extracellular matrix and its expression has been linked to tumor angiogenesis and metastasis. I demonstrated that TNC downregulates the expression of the Wnt signalling inhibitor DKK1 and by that enhances Wnt/-catenin signalling. Reduced stress fibre formation in the presence of TNC was identified as a major mechanism contributing to DKK1 downregulation. The activity of the actin-regulated SRF co-transcription factor MKL1 was found to be reduced in the presence of TNC. My results indicate that TNC-regulated MKL1 function maybe one, but not the major mechanism of DKK1 regulation by the actin status and that other factors, presumably regulated by actin stress fibres, are involved. Enhanced Wnt signalling activity downstream of TNC-induced DKK1 downregulation might be a major mechanism by which TNC promotes tumor progression. Furthermore, this study discovered a novel mechanism of regulating the Wnt inhibitor DKK1 by the integrity of the actin cytoskeleton.</dcterms:abstract>
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