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<dc:title xml:lang="fr">Identification et caractérisation de nouveaux mécanismes moléculaires et cellulaires dépendant de la Ténascine-C et impliqués dans l'agressivité du cancer du sein</dc:title>
<dcterms:alternative xml:lang="en">Elucidating novel molecular and cellular mechanisms in Tenascin-C dependent breast cancer aggressiveness</dcterms:alternative>
<dc:subject xml:lang="fr">Cancer</dc:subject>
<dc:subject xml:lang="fr">Sein</dc:subject>
<dc:subject xml:lang="fr">Métastases pulmonaires</dc:subject>
<dc:subject xml:lang="fr">Matrice extracellullaire</dc:subject>
<dc:subject xml:lang="fr">Ténascine</dc:subject>
<dc:subject xml:lang="en">Cancer</dc:subject>
<dc:subject xml:lang="en">Breast</dc:subject>
<dc:subject xml:lang="en">Lung metastasis</dc:subject>
<dc:subject xml:lang="en">Extracellular matrix</dc:subject>
<dc:subject xml:lang="en">Tenascin</dc:subject>
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<tef:elementdEntree autoriteExterne="040835804" autoriteSource="Sudoc.FMesh">Ténascine</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La Ténascine-C (TNC) est une molécule de la matrice extracellulaire qui est anormalement surexprimée dans entre autres, le cancer du sein. Le but principal de ma thèse était de mieux comprendre les différentes contributions de la TNC, durant l’établissement et progression des cancers mammaires. Mes résultats acquis avec le modèle transgénique NeuNT soutiennent fortement la notion que la TNC exerce des rôles pléiotropiques et cruciaux à la fois à des stades précoces et à des stades ultimes de la progression tumorale mammaire. D'autre part, j’ai développé de nouvelles lignées cellulaires cancéreuses mammaires syngéniques à partir des deux modèles transgéniques. En utilisant des modèles murins et des approches in vitro, mon travail de doctorat a permis de mettre en lumière différentes contributions importantes de la TNC au cours de la carcinogenèse mammaire. Les analyses encore en cours permettront rapidement de mieux cerner les mécanismes moléculaires et cellulaires mis en jeu en aval de la TNC et impliqués dans la progression tumorale mammaire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The microenvironment, which comprises the extracellular matrix (ECM), plays instrumental roles during tumor formation and progression. Tenascin-C (TNC) is a major ECM component highly expressed in breast cancer, correlating with poor prognosis, tamoxifen resistance and lung metastasis formation. TNC exerts pleiotropic effects by promoting tumor cell survival, proliferation and invasion as well as angiogenesis , inflammation and metastasis. The main goal of my thesis was to try to comprehensively understand the several contributions of TNC during breast cancer establishment and progression to metastatic disease. My analyses revealed that the absence of TNC does not affect breast tumorigenesis in the MMTV-PyMT breast cancer mouse model, confirming a previous study. More interestingly, using the MMTV-NeuNT model, we show that TNC promotes primary tumor initiation and lung metastatic colonization. In the lung, TNC increases of cancer cell survival in intravascular metastases and promotes their progression. Additionally, we established breast cancer cell lines from MMTV-PyMT and MMTV-NeuNT mouse models that grow in vitro and are tumorigenic when re-Implanted in syngeneic, fully immuno-Competent mice. In this work we had shown that TNC participates in tumor initiation and in lung metastasis colonization in an ErbB2-Driven transgenic breast cancer mouse model. The established cell lines are alternative tools useful for in vivo and in vitro studies in breast cancer research.</dcterms:abstract>
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