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<dc:title xml:lang="fr">Développement de nouveaux hydrogels injectable à base de chitosane pour la délivrance sous-cutanée de protéines</dc:title>
<dcterms:alternative xml:lang="en">Development of novel injectable chitosan-based hydrogels for the subcutaneous delivery of proteins</dcterms:alternative>
<dc:subject xml:lang="fr">Hydrogel</dc:subject>
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<dc:subject xml:lang="fr">Anticorps monoclonal</dc:subject>
<dc:subject xml:lang="fr">Conjugués anticorps-médicament</dc:subject>
<dc:subject xml:lang="fr">Délivrance de médicaments</dc:subject>
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<dc:subject xml:lang="en">Monoclonal antibody</dc:subject>
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<tef:elementdEntree autoriteExterne="031730620" autoriteSource="Sudoc">Chitosane</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027880966" autoriteSource="Sudoc">Anticorps monoclonaux</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les progrès de la médecine ont permis, en oncologie, la transition des cytotoxiques non ciblés vers les anticorps monoclonaux (mAbs), puis des conjugués anticorps-médicament (ADCs), qui associent la puissance de la chimiothérapie à la spécificité de l'anticorps. Ces molécules restent néanmoins limitées à une administration intraveineuse, du fait de leur cytotoxicité. La voie sous-cutanée bénéficierait au confort du patient comme à l’ensemble de la chaîne hospitalière. La seule technologie actuellement validée repose sur la hyaluronidase recombinante (rHuPH20), dont les limites et la tolérance ne permettent pas d'y transposer un ADC vésicant.Ce projet de thèse aborde cette problématique à travers deux preuves de concept : le trastuzumab (mAb) et le trastuzumab-emtansine (ADC). Ces travaux vont de la caractérisation jusqu’aux études précliniques in vivo, d’un hydrogel de chitosane administrable par voie sous-cutanée, fonctionnalisé par le DOTAGA ou par un dérivé de l'acide tartrique. Ces greffages modifient les propriétés physico-chimiques du chitosane, ouvrant la voie à un contrôle sur mesure de la délivrance du composé chargé.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Advances in medicine have shifted oncology away from untargeted cytotoxics towards monoclonal antibodies (mAbs), and more recently towards antibody-drug conjugates (ADCs), which pair the potency of chemotherapy with the specificity of an antibody. However, these molecules remain confined to intravenous administration because of their cytotoxicity. A subcutaneous route would benefit patient comfort as much as the wider hospital chain. The only technology validated to date relies on recombinant hyaluronidase (rHuPH20), whose limitations and tolerability profile rule out its extension to a vesicant ADC.This thesis addresses that gap through two proofs of concept, trastuzumab (mAb) and trastuzumab emtansine (ADC). The work runs from characterisation through to in vivo preclinical studies of a subcutaneously injectable chitosan hydrogel, functionalised either with DOTAGA or with a tartaric acid derivative. These graftings alter the physicochemical and gelation properties of chitosan, opening the way to tailored control over the release of the loaded compound.</dcterms:abstract>
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