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<dc:title xml:lang="en">Characterization of therapeutic proteins by capillary electrophoresis (CE) coupled to mass spectrometry (MS)</dc:title>
<dcterms:alternative xml:lang="fr">Caractérisation de protéines thérapeutiques par électrophorèse capillaire (CE) couplée à la spectrométrie de masse (MS)</dcterms:alternative>
<dc:subject xml:lang="fr">Electrophorèse capillaire</dc:subject>
<dc:subject xml:lang="fr">Spectrométrie de masse</dc:subject>
<dc:subject xml:lang="fr">Anticorps monoclonaux</dc:subject>
<dc:subject xml:lang="fr">Glycosylations</dc:subject>
<dc:subject xml:lang="fr">Modification post-traductionnelles</dc:subject>
<dc:subject xml:lang="fr">Anticorps monoclonaux conjugués à un principe actif</dc:subject>
<dc:subject xml:lang="en">Capillary electrophoresis</dc:subject>
<dc:subject xml:lang="en">Mass spectrometry</dc:subject>
<dc:subject xml:lang="en">Monoclonal antibodies</dc:subject>
<dc:subject xml:lang="en">Glycosylation</dc:subject>
<dc:subject xml:lang="en">Post-translational modifications</dc:subject>
<dc:subject xml:lang="en">Antibodies drug conjugates</dc:subject>
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<tef:elementdEntree autoriteExterne="027880966" autoriteSource="Sudoc">Anticorps monoclonaux</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les anticorps monoclonaux (mAbs) sont des glycoprotéines complexes possédant de nombreuses micro-hétérogénéités qui peuvent influencer leur efficacité dans l’organisme. Il est par conséquent nécessaire de développer des méthodes analytiques robustes, sensibles et spécifiques pour les caractériser avec la plus grande précision. L’objectif de cette thèse a été de développer des méthodes analytiques permettant la caractérisation fine et à différents niveaux d’un anticorps monoclonal, le cetuximab, ainsi qu’un anticorps monoclonal conjugués à un principe actif, le brentuximab vedotin, sur des couplages direct ou indirect de l’électrophorèse capillaire et la spectrométrie de masse. Dans une première partie, une approche middle-up protéomique du cetuximab a été réalisé sur le couplage indirect CZE-UV/MALDI-MS afin de séparer et caractériser les variants de charges du fragment F/2 et F(ab)’2 ainsi que la caractérisation top-down des fragments Fc/2. Ensuite une nouvelle stratégie indirecte CZE-UV/nanoESI-MS a été développée pour permettre la caractérisation fine de ce mAbs partiellement digéré. Enfin un couplage direct par CESI-MS a été développé pour permettre l’analyse rapide et précise du cetuximab middle-up. Dans une deuxième partie, la combinaison d’analyse de mAbs d’intact, middle-up et bottom-up protéomique a été réalisée sur le couplage CZE-UV/nanoESI-MS et CESI-MS. Cela a permis la caractérisation à différent niveau du brentuximab vedotin. Cette méthodologie a permis l’analyse du DAR, l’identification de fragments conjugués, la caractérisation simultanée de la séquence complète de l’anticorps, d’un grand nombre de modifications post-traductionnelles, la caractérisation des peptides conjugués ainsi que l’identification d’ions diagnostiques du principe actif.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Monoclonal antibodies (mAbs) are highly complex glycoproteins having a lot of micro-heterogeneities which can influence their effectiveness. As a consequence, it is necessary to develop robust analytical methods, sensitive and specific to characterize them with high accuracy. The purpose of this thesis was to develop analytical methods allowing the multi-level characterization of monoclonal antibody (cetuximab), and antibody drug conjugates (brentuximab vedotin), using on-online or off-line capillary electrophoresis – mass spectrometry coupling. In the first section, a middle-up proteomic approach of cetuximab was carried out using Off-line CZE-UV/MALDI-MS coupling to separate and to characterize Fc/2 and F(ab)’2 charge variants. A top-down characterization of Fc/2 fragments was also employed. Then a new strategy off-line CZE-UV/nanoESI-MS was used to allow the characterization of this partially digest mAbs. Finally, an online coupling by CESI-MS was developed to allow the fast and accurate analysis of middle-up cetuximab. In a second part, the combination of intact, middle-up and bottom-up proteomic carried out on CZE-UV/nanoESI-MS and CESI coupling allowed the most exhaustive characterization of brentuximab vedotin. This methodology allowed the analyze of DAR, the identification of fragments drug conjugates, the simultaneous characterization of the complete structure of antibody, a significant number of post-translational modifications, all peptides drug conjugates and the identification of diagnostic ions.</dcterms:abstract>
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