Synthèse de nanoparticules superparamagnétiques biofonctionnalisées pour la thérapie anticancéreuse et étude de complexes hybrides nanostructurés par microcalorimétrie
Auteur / Autrice : | Jérémie Courtois |
Direction : | Jean-François Berret |
Type : | Thèse de doctorat |
Discipline(s) : | Matière condensée et Interfaces |
Date : | Soutenance en 2012 |
Etablissement(s) : | Paris 7 |
Mots clés
Mots clés contrôlés
Résumé
In the field of the biomedical applications of the superparamagnetic iron oxide nanoparticles, this PhD work presents the synthesis and the characterization of 10 nm maghemite nanoparticles biofunctionalized by peptides which have a specific interaction with cancer cells. The nanoparticles are firstly coated with poly(sodium acrylate) oligomer chains to stabilize them in biological media. Then, the peptide is covalently coupled to the carboxylate functions of the coating. Biofunctionalized nanoparticles are intended to the targeting of prostatic and pancreatic cancer cells in in vitro and in vivo experiments. Secondly, the poly(sodium acrylate) coated nanoparticles spontaneously form 100 nm colloidal complexes when mixed with cationic polyelectrolyte bloc / neutral bloc copolymers. These complexes can potentially find an interest in biomedicine, especially in magnetic resonance imaging. In this work, the thermodynamic of this electrostatic complexation is studied by microcalorimetry using the isothermal titration calorimetry technique. This leads to a better understanding of the mechanism of the reaction and of the relation between the formulation and structure of colloidal species obtained.