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Céramiques phosphocalciques fonctionnalisées : étude des propriétés de surface par méthodes spectroscopiques

Abstract : This work is ascribed within the framework of the development of osteoinductive biomaterials for the repair large bone defects. It is a contribution to the understanding of the physical and chemical interactions between phosphocalcic ceramics and two proteins of interest: fibronectin (Fn), a cell adhesion protein, and Vascular Endothelial Growth Factor (VEGF) which is involved in vascularisation and improvement of bone formation.Fibronectin/bioceramic physical interactions were studied by force spectroscopy to evaluate the influence of the topography and the chemical composition of phosphocalcic ceramics made of hydroxyapatite (HA), silicated hydroxyapatite (SiHA) and carbonated hydroxyapatite (CHA) on fibronectin adhesion. The results obtained in terms of force cartography do not indicate any impact of the polished ceramics chemistry on the surface distribution and intensity of adhesion forces. However, these forces are more intense at the level of the grain boundaries of unpolished ceramics, highlighting an influence of the topography modulated by the chemical composition.The protocol for functionalisation by VEGF consists of three steps: silanisation, addition of SM(PEG)6 and immobilisation of VEGF. VEGF/bioceramic chemical interactions were studied mainly by Raman imaging in order to follow the successive steps of the functionalisation by VEGF of the polished surface of ceramics made of hydroxyapatite (HA) and carbonated hydroxyapatite (CHA). This approach allowed to map the surface chemical changes and to point out the spatial distribution as well as the preferential reactions between the intermediate molecules and VEGF depending of the substrate.
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Nadia El Felss. Céramiques phosphocalciques fonctionnalisées : étude des propriétés de surface par méthodes spectroscopiques. Matériaux. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0109⟩. ⟨tel-02101232⟩

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