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<dc:title xml:lang="fr">Synthèse de nanoparticules hybrides de type coeur-coquille à visées théranostiques</dc:title>
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<dc:subject xml:lang="fr">Nanoparticules</dc:subject>
<dc:subject xml:lang="fr">Théranostique</dc:subject>
<dc:subject xml:lang="fr">Cœur-coquille</dc:subject>
<dc:subject xml:lang="fr">Oxyde de fer</dc:subject>
<dc:subject xml:lang="fr">Silice mésoporeuse</dc:subject>
<dc:subject xml:lang="fr">Nanocapsule d’HSA</dc:subject>
<dc:subject xml:lang="fr">Albumine</dc:subject>
<dc:subject xml:lang="fr">IRM</dc:subject>
<dc:subject xml:lang="fr">Hyperthermie magnétique</dc:subject>
<dc:subject xml:lang="fr">Délivrance contrôlée de médicaments</dc:subject>
<dc:subject xml:lang="en">Nanoparticles</dc:subject>
<dc:subject xml:lang="en">Theranostic</dc:subject>
<dc:subject xml:lang="en">Core-shell</dc:subject>
<dc:subject xml:lang="en">Iron oxide</dc:subject>
<dc:subject xml:lang="en">Mesoporous silica</dc:subject>
<dc:subject xml:lang="en">HSA nanocapsule</dc:subject>
<dc:subject xml:lang="en">Albumin</dc:subject>
<dc:subject xml:lang="en">MRI</dc:subject>
<dc:subject xml:lang="en">Magnetic hyperthermia</dc:subject>
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<tef:elementdEntree autoriteExterne="034762590" autoriteSource="Sudoc">Matériaux hybrides</tef:elementdEntree>
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<tef:vedetteRameauNomCommun>
<tef:elementdEntree autoriteExterne="027355217" autoriteSource="Sudoc">Matériaux poreux</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027654281" autoriteSource="Sudoc">Sérum-albumine</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="16129748X" autoriteSource="Sudoc">Théranostique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le but de ce travail de thèse a été de synthétiser de nouveaux nano-objets pour le diagnostic et le traitement du cancer. Ainsi, nous avons développé des nanoparticules hybrides constituées d'un noyau inorganique recouvert d'une couche organique de sérum albumine humaine (HSA). Le noyau inorganique est un composite constitué d'un cœur d'oxyde de fer (IO) et d'une coquille de silice mésoporeuse (MS). L’IO permet, grâce à ses propriétés magnétiques, le diagnostic par imagerie par résonance magnétique (IRM) et la thérapie par hyperthermie magnétique (HM), tandis que les porosités de la MS permettent l’encapsulation de médicaments pour la chimiothérapie. La taille des pores de la coquille MS a été modulée afin d’augmenter le taux d’encapsulation en médicament et la taille du cœur d’IO a été ajustée pour améliorer les propriétés d’HM et d'IRM. L'utilisation d’un revêtement final d’HSA en tant que gatekeeper pour la délivrance de médicaments contrôlée par action enzymatique a également été étudiée. En parallèle, des nanocapsules d’HSA chargées en médicament ont été synthétisées. Enfin, les activités biologiques de ces nanoparticules ont été testées sur différentes lignées cellulaires cancéreuses.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The aim of this PhD work was to synthesize and test new nano-objects for the diagnosis and treatment of cancer. For this purpose, we developed hybrid nanoparticles made of an inorganic core surrounded by a human serum albumin (HSA) organic coating. The inorganic core is a composite by itself as it is made of an iron oxide core (IO) surrounded by a mesoporous silica (MS) shell. The IO core ensures, through its magnetic properties, diagnosis by magnetic resonance imaging (MRI) and therapy by magnetic hyperthermia, whereas the MS shell allows the loading of anticancer drugs for chemotherapy within its porosities. The pore sizes of the silica shell were modulated to enhance the drug loading content and the IO core size was also tuned to improve magnetic hyperthermia as well as T2 MRI imaging properties of the final core-shell system. The use of a thick shell of HSA as gatekeeper for controlled drug delivery triggered by its degradation with proteases was also studied. In parallel the synthesis of drug loaded HSA nanocapsules using MS as sacrificial template was performed. Finally, the biological activities of these nanoparticles were tested on various cancer cell lines.</dcterms:abstract>
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