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• W2036744888 abstract "Biodegradable micro- or nanoparticles with surface adsorbed antigens represent a promising method for in vivo delivery of vaccines. Most vaccines, licensed or under development, are based on combined delivery of multiple antigens. Thus, we investigated the feasibility of combining two vaccine antigens, HIV-1 p24 and gp120 proteins, on the surface of surfactant-free anionic PLA nanoparticles obtained by an improved solvent diffusion method. The analysis of adsorption isotherms has shown that both proteins had similar and high affinities for the nanoparticles. Coadsorption of p24 and gp120 onto the same PLA particle was evidenced by sandwich ELISA, using antibodies directed against one protein for particle capture and the other one for detection. To assess structural integrity, the antigenicity of free and PLA-adsorbed antigens was compared by competition ELISA, using a set of 6 anti-p24 and 7 anti-gp120 antibodies, as well as soluble CD4. The antigenicity of proteins on the nanoparticle surface was well preserved, adsorbed either individually or in combination. Furthermore, both antigens maintained their immunogenicity, since high antibody titres (106 for p24 and 105 for gp120) were elicited in mice with monovalent and divalent PLA formulations. Taken together our results show that development of multivalent vaccines based on anionic PLA nanoparticles is possible. Moreover, coadsorption of a ligand for cell-specific targeting or of an immunostimulatory molecule will further extend the field of application of delivery systems based on charged micro- and nanoparticles." @default.
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• W2036744888 date "2006-09-01" @default.
• W2036744888 modified "2023-10-18" @default.
• W2036744888 title "Coadsorption of HIV-1 p24 and gp120 proteins to surfactant-free anionic PLA nanoparticles preserves antigenicity and immunogenicity" @default.
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• W2036744888 doi "https://doi.org/10.1016/j.jconrel.2006.07.006" @default.
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