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<dc:title xml:lang="en">Impact of tenascin-C on anti-tumor immunity in a breast tumor progression model</dc:title>
<dcterms:alternative xml:lang="fr">Impact de la ténascine-C sur l’immunité anti-tumorale dans un modèle de progression tumoral mammaire</dcterms:alternative>
<dc:subject xml:lang="fr">Microenvironnement tumoral</dc:subject>
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<dc:subject xml:lang="fr">Tenascine-C</dc:subject>
<dc:subject xml:lang="fr">Matrice extracellulaire</dc:subject>
<dc:subject xml:lang="fr">Lymphocytes CD8 infiltrant la tumeur</dc:subject>
<dc:subject xml:lang="fr">NKG2D</dc:subject>
<dc:subject xml:lang="en">Tumor immune microenvironment</dc:subject>
<dc:subject xml:lang="en">Tenascin-C</dc:subject>
<dc:subject xml:lang="en">Extracellular matrix</dc:subject>
<dc:subject xml:lang="en">CD8 tumor infiltrating lymphocytes</dc:subject>
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<dcterms:abstract xml:lang="fr">La ténascine-C (TNC) est une protéine matricielle favorisant la progression tumorale et le développement de métastases, et son expression élevée chez les patients atteints de cancer est corrélée à un mauvais pronostic. Durant ma thèse j’ai étudié l’impact de la TNC sur l’immunité anti-tumorale en utilisant le modèle murin MMTV-NeuNT et le modèle de greffe orthotopique syngénique de cellules cancéreuses mammaires NT193. Nos résultats ont montré que la TNC empêche une action efficace de la réponse anti-tumorale en séquestrant les lymphocytes T CD8+ dans les réseaux de matrice, ceci en faisant intervenir la voie de signalisation CXCL12/CXCR4. L’inhibition de CXCR4 permet l’infiltration des lymphocytes T CD8+ dans la niche tumorale et augmente le nombre de cellules cancéreuses en apoptose menant ainsi à une régression tumorale. D’autre part, l’établissement d’une nouvelle lignée de cellules tumorales mammaires nous a permis de montrer que la TNC peut également avoir un rôle opposé et favoriser le rejet des cellules tumorales dans la phase initiale du développement tumoral post greffe. Les mécanismes sous-jacents restent cependant à être élucider. Enfin, nos premiers résultats sur cette lignée cellulaire montre que la TNC induit l’expression de NKG2DL dans cette lignée suggérant ainsi que la TNC a un lien avec l’axe NKG2D/NKG2DL dont l’impact sur le développement tumoral reste à établir.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Tenascin-C is an extracellular matrix protein promoting tumor progression and metastasis development, and its expression in cancer patients correlates with poor prognosis. During my thesis I studied the impact of TNC on anti-tumor immunity using the MMTV-NeuNT mouse model and a syngeneic orthotopic grafting model based on the NT193 breast cancer cell line. Our results showed that TNC impairs the anti-tumor immune response by sequestrating CD8+ T lymphocytes in the tumor matrix tracks involving CXCL12/CXCR4 signaling. Inhibition of CXCR4 enables the infiltration of CD8+ T lymphocytes into the tumor cell nest and increases tumor cell death. Moreover, the establishment of a novel breast cancer cell line enabled us to show that TNC can also have an opposite effect inducing tumor cell rejection in the early phase of tumor development after engraftment. The underlying mechanisms remain to be elucidated. Finally, our first results show that TNC regulates NKG2DL in this new cancer cell line suggesting that TNC has a link with the NKG2D/NKG2DL whose impact on tumor development has to be further studied.</dcterms:abstract>
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