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<dc:title xml:lang="fr">Thérapie photodynamique pour le traitement des carcinomes épidermoïdes de la tête et du cou : étude des mécanismes moléculaires de photosensibilisants à base de ruthénium</dc:title>
<dcterms:alternative xml:lang="en">Photodynamic therapy for the treatment of head and neck squamous cell carcinomas : study of the molecular mechanisms of ruthenium-based photosensitizers</dcterms:alternative>
<dc:subject xml:lang="fr">Carcinomes épidermoïdes de la tête et du cou</dc:subject>
<dc:subject xml:lang="fr">Thérapie photodynamique</dc:subject>
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<dc:subject xml:lang="fr">Stress du réticulum endoplasmique</dc:subject>
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<dc:subject xml:lang="fr">Morts cellulaires</dc:subject>
<dc:subject xml:lang="en">Head and neck squamous cell carcinomas</dc:subject>
<dc:subject xml:lang="en">Photodynamic therapy</dc:subject>
<dc:subject xml:lang="en">Ruthenium</dc:subject>
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<dcterms:abstract xml:lang="fr">Les carcinomes épidermoïdes de la tête et du cou (CETEC) sont des cancers fréquents et de mauvais pronostic avec une survie globale à 5 ans inférieure à 50%. La thérapie photodynamique (PDT) est une alternative thérapeutique consistant en l’injection systémique d’un photosensibilisant (PS) dont la toxicité est localement activée par illumination de la tumeur. A travers l’étude de deux PS à base de ruthénium (Ru1 et Ru2), nous avons mis en évidence l’efficacité anti-tumorale in vitro de ces deux PS dans des lignées de CETEC, avec des IC50 &lt; 1µM après activation à la lumière. Nos résultats montrent que Ru1 et Ru2 sont deux capables d’induire in vitro des marqueurs de l’autophagie, de la ferroptose et de la mort cellulaire immunogène. Cependant, alors que Ru1 semble induire une apoptose tolérogène, caspase-7 dépendante et corrélée avec l’induction d’un stress du réticulum endoplasmique, Ru2 ne semble pas ou peu induire ces mécanismes mais induit une immunogénicité in vivo. L’ensemble de nos résultats mettent en avant la complexité des mécanismes impliqués dans la phototoxicité de ces PS et la nécessité d’analyses plus approfondies avant leur transfert en clinique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Head and neck squamous cell carcinomas (HNSCC) are frequent cancers with a poor prognosis, and a 5-year overall survival below 50%. Photodynamic therapy (PDT) is a therapeutic alternative involving the systemic injection of a photosensitizer (PS) whose toxicity is locally activated by tumor illumination. Through the study of two ruthenium-based PS (Ru1 and Ru2), we have demonstrated the in vitro anti-tumor efficacy of these two PS in HNSCC cell lines, with IC50 &lt; 1µM after light activation. Our results show that Ru1 and Ru2 are both capable of inducing markers of autophagy, ferroptosis and immunogenic cell death in vitro. However, whereas Ru1 appears to induce a tolerogenic, caspase-7-dependent apoptosis correlated with the induction of endoplasmic reticulum stress, Ru2 appears to induce little or none of these mechanisms but induces immunogenicity in vivo. Taken together, our results highlight the complexity of the mechanisms involved in the phototoxicity of these PS and the need for further analysis before their transfer to the clinic.</dcterms:abstract>
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