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<dc:title xml:lang="en">Targeting the extracellular matrix molecule tenascin-C in breast cancer</dc:title>
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<dc:subject xml:lang="fr">Tenascin-C</dc:subject>
<dc:subject xml:lang="fr">Microenvironnement tumoral</dc:subject>
<dc:subject xml:lang="fr">Cancer du sein</dc:subject>
<dc:subject xml:lang="fr">TRAIL</dc:subject>
<dc:subject xml:lang="fr">Réponse immunitaire</dc:subject>
<dc:subject xml:lang="fr">Ciblage peptides</dc:subject>
<dc:subject xml:lang="en">Tenascin-C</dc:subject>
<dc:subject xml:lang="en">Tumor microenvironment</dc:subject>
<dc:subject xml:lang="en">Breast cancer</dc:subject>
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<dc:subject xml:lang="en">Immune response</dc:subject>
<dc:subject xml:lang="en">Targeting peptides</dc:subject>
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<dcterms:abstract xml:lang="fr">La ténascine-C (TNC) est une protéine de la matrice extracellulaire fortement exprimée dans le tissu tumoral. La TNC favorise la progression tumorale et les métastases et est corrélée à un mauvais pronostic. Dans cette thèse, j'ai étudié la régulation complexe du ligand de mort TRAIL par la TNC et le potentiel thérapeutique du peptide MAREMO MP5 dans le cancer du sein. Nos résultats ont révélé que les cellules cancéreuses ne meurent pas malgré l'expression de TRAIL et DR5. Le TRAIL endogène déclenche la phagocytose liée aux macrophages impliquant l'axe de signalisation TGFβ-CXCR4. Cependant, les effets bénéfiques de TRAIL sont abolis par la TNC via l'induction de la transition épithéliale-mésenchymateuse qui protège les cellules tumorales de la cytotoxicité de TRAIL et par une régulation à la baisse de l'expression de TRAIL via l'intégrine α9β1. Nous démontrons que le traitement des tumeurs avec le peptide MAREMO MP5 qui cible la TNC, bloque la croissance tumorale et la dissémination des cellules tumorales en empêchant plusieurs caractéristiques du cancer. Dans l'ensemble, notre étude a démontré que MP5 est un médicament prometteur qui peut avoir un effet anti-tumoral plus fort lorsqu'il est combiné avec le TRAIL exogène.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Tenascin-C (TNC) is an extracellular matrix protein highly expressed in tumor tissue. TNC promotes tumor progression and metastasis, correlating with poor prognosis. In this thesis, I investigated the intricate regulation of the death ligand TRAIL by TNC and the therapeutic potential of the MAREMO peptide MP5 in breast cancer. Our results revealed that cancer cells are not dying despite expressing TRAIL and DR5. Endogenous TRAIL triggers macrophages-related phagocytosis involving the TGFβ-CXCR4 signaling axis. But, the beneficial effects of TRAIL are abolished by TNC through the induction of epithelial-to-mesenchymal transition that protects the tumor cells from TRAIL cytotoxicity and, by downregulating TRAIL expression via integrin α9β1. We demonstrate that the treatment of tumors with the MAREMO peptide MP5 that is targeting TNC, blocks tumor growth and tumor cell dissemination by impeding several hallmarks of cancer. Altogether, our study demonstrates that MP5 is a promising drug which may have a stronger anti-tumor effect when combined with exogenous TRAIL.</dcterms:abstract>
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