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<dc:title xml:lang="en">In vitro evaluation of hypoxia-targeting molecules combined with chemoradiotherapy to overcome hypoxia-induced resistance in glioblastoma</dc:title>
<dcterms:alternative xml:lang="fr">Etude in vitro de molécules ciblant l’hypoxie en combinaison avec la chimioradiothérapie pour contrer la résistance induite par l’hypoxie dans le glioblastome</dcterms:alternative>
<dc:subject xml:lang="fr">Glioblastome</dc:subject>
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<dc:subject xml:lang="fr">Inhibiteurs de HIF-2α</dc:subject>
<dc:subject xml:lang="fr">PT2385</dc:subject>
<dc:subject xml:lang="fr">Belzutifan</dc:subject>
<dc:subject xml:lang="fr">Réoxygénation</dc:subject>
<dc:subject xml:lang="fr">Radiothérapie FLASH</dc:subject>
<dc:subject xml:lang="en">Glioblastoma</dc:subject>
<dc:subject xml:lang="en">Hypoxia</dc:subject>
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<dcterms:abstract xml:lang="fr">Le glioblastome est la tumeur cérébrale maligne primaire la plus agressive avec un pronostic défavorable. L’hypoxie chronique favorise la progression et la résistance aux traitements du glioblastome, justifiant le développement de stratégies thérapeutiques ciblant l’hypoxie. Nous avons montré que l’inhibition in vitro de HIF-2α par PT2385 ou le Belzutifan, associée à la chimioradiothérapie, réduisait significativement la fraction de survie et augmentait les cassures double brin dans des lignées cellulaires de glioblastome. Aucune altération du cycle cellulaire, de la migration ou du niveau de MSH6 n’a été observée. Par ailleurs, la réoxygénation induite par l’encapsulation liposomale du trans-sodium crocétinate a permis de d’augmenter la disponibilité en oxygène sur une période étendue in vitro, réduisant significativement la survie clonogénique et augmentant les cassures double brin de l’ADN avec la chimioradiothérapie. Enfin, nous avons validé la génération de rayons X de haute énergie à ultra-haut débit de dose avec un Rhodotron® TT300, permettant une future validation biologique de l’effet FLASH.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Glioblastoma is the most aggressive primary malignant brain tumor with a poor prognosis. Chronic tumor hypoxia promotes progression and therapy resistance, making hypoxia-targeted strategies a critical therapeutic focus. We demonstrated that in vitro inhibition of HIF-2α with PT2385 or Belzutifan, in combination with chemoradiotherapy, significantly reduced the surviving fraction and increased double-strand breaks in glioblastoma cell lines. Further analysis did not reveal changes in cell cycle, migration or MSH6 protein levels under the triple combination. Additionally, reoxygenation using a liposomal encapsulation of trans-sodium crocetinate increased oxygen availability over prolonged periods in vitro, thereby significantly decreasing the surviving fraction and increasing double-stand breaks combined with chemoradiotherapy. Further investigations showed no significant modulation of the cell cycle or superoxide anion levels with the same combination. Finally, we demonstrated the generation of ultra-high dose rate high-energy X-rays using a Rhodotron® TT300, enabling future biological validation of the FLASH effect.</dcterms:abstract>
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