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<dc:title xml:lang="fr">Rôle des histones désacétylases dans la réponse aux chimiothérapies et dans l’immunogénicité du cancer gastrique</dc:title>
<dcterms:alternative xml:lang="en">Role of histone deacetylases in chemotherapy response and immunogenicity in gastric cancer</dcterms:alternative>
<dc:subject xml:lang="fr">Mort cellulaire immunogène</dc:subject>
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<dc:subject xml:lang="fr">Histone désacétylase</dc:subject>
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<dc:subject xml:lang="fr">Oxaliplatine</dc:subject>
<dc:subject xml:lang="fr">Cancer gastrique</dc:subject>
<dc:subject xml:lang="en">Immunogenic cell death</dc:subject>
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<dc:subject xml:lang="en">Histone deacetylase</dc:subject>
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<dcterms:abstract xml:lang="fr">Le cancer gastrique (CG) est un cancer agressif qui est principalement traité par des chimiothérapies à base de platine. Aux stades avancés et métastatiques, la survie à 5 ans est de 5,6%, soulignant l’importance d’identifier de nouveau biomarqueurs et d’améliorer la prise en charge des patients atteints de CG. Durant mon projet de thèse, j’ai montré qu’un inhibiteur des histones désacétylases (HDACi), le SAHA, pouvait induire, de manière synergique avec l’oxaliplatine, la mort des cellules de CG. J’ai démontré que le traitement combiné peut induire l’apoptose à travers l’expression de la protéine PD-L1, régulée par les facteurs HIF-2α et p53. J’ai également mis en évidence l’induction d’une mort cellulaire immunogène bona fide et l’activation de réponses immunitaires anti-tumorales par le traitement combiné, dans les cellules de CG. Ainsi, ce traitement semble favoriser la mort des cellules de CG à travers des mécanismes immunogènes et non-immunogènes. Ces travaux de thèse ont permis de mettre en évidence la capacité d’un HDACi, en combinaison avec l’oxaliplatine, à améliorer l’immunogénicité des cellules de CG. Ces résultats suggèrent que le traitement combiné pourrait améliorer la réponse des patients atteints de CG aux thérapies actuelles, notamment à l’immunothérapie.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Gastric cancer (GC) is an aggressive cancer that is mainly treated with platinum-based chemotherapies. At advanced and metastatic stages, the 5-year survival is 5.6%, highlighting the importance of identifying new biomarkers and improving the management of GC patients. During my thesis project, I showed that a histone deacetylase inhibitor (HDACi), SAHA, could synergistically induce GC cell death with oxaliplatin. I demonstrated that the combined treatment can induce apoptosis through the expression of PD-L1 protein, regulated by HIF-2α and p53 factors. I also demonstrated the induction of bona fide immunogenic cell death and the activation of anti-tumor immune responses by the combined treatment, in GC cells. Thus, this treatment seems to promote GC cell death through both immunogenic and non-immunogenic mechanisms. This thesis work demonstrated the ability of an HDACi, in combination with oxaliplatin, to enhance the immunogenicity of GC cells. These results suggest that the combined treatment may improve the response of GC patients to current therapies, including immunotherapy.</dcterms:abstract>
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