Cisplatine : une vieille molécule pour de nouveaux défis. : développement d’une prodrogue macromoléculaire multifonctionnelle applicable au traitement local du glioblastome

Abstract : Glioblastoma is the most frequent and aggressive primary malignant tumor of the central nervous system with a gloomy prognosis. Local infusion of cisplatin within the brain parenchyma exhibited promising results in preclinical models. Nanovectorization of anticancer agents even promotes the concentration of their therapeutic efficiency on their target. Anchorage ofimaging moieties on such smart drug delivery systems further enables the non-invasive monitoring of their biodistribution within the damaged tissue by magnetic resonance imaging (MRI). From this perspective, a biocompatible amphiphilic triblock copolymer was synthesized by successive ring-opening polymerizations from a polyethylene oxide (PEO). After micellization in water, gadolinium complexes were grafted to the PEO corona and the carboxylate functions located at the surface of the micelle’s core were able to cross-link with cisplatin. A stable nano-sized macromolecular prodrug was therefore recovered. Relaxomety measurements at a high magnetic field confirmed the intrinsic potential of these hybrid nanoparticles as alternative MRI contrast agents. Besides, cisplatin vectorization allowed for substantially increasing the accumulation of platinum compounds in two human glioblastoma cell lines as well as the subsequent formation of DNA adducts in comparison with the free drug. Biological mechanisms below this study raise the question whether critical alternative targets of platinum derivatives might exist, thus undermining the old-established paradigm that defines DNA as the ultimate target of cisplatin.
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Hélène Lajous. Cisplatine : une vieille molécule pour de nouveaux défis. : développement d’une prodrogue macromoléculaire multifonctionnelle applicable au traitement local du glioblastome. Médecine humaine et pathologie. Université d'Angers; Université de Liège, 2018. Français. ⟨NNT : 2018ANGE0046⟩. ⟨tel-02178362⟩

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