Surface-functionalized, pH-responsive poly(lactic-co-glycolic acid)-based microparticles for intranasal vaccine delivery: Effect of surface modification with chitosan and mannan - PubMed (original) (raw)
Surface-functionalized, pH-responsive poly(lactic-co-glycolic acid)-based microparticles for intranasal vaccine delivery: Effect of surface modification with chitosan and mannan
Ze Li et al. Eur J Pharm Biopharm. 2016 Dec.
Abstract
In the present study, surface-functionalized, pH-responsive poly(lactic-co-glycolic acid) (PLGA) microparticles were investigated for nasal delivery of hepatitis B surface Antigen (HBsAg). pH-responsive PLGA, chitosan modified PLGA (CS-PLGA), mannan modified PLGA (MN-PLGA), mannan and chitosan co-modified PLGA (MN-CS-PLGA) microparticles were prepared utilizing a double-emulsion method. Antigen was released rapidly from four types of microparticles at pH5.0 and pH 6.0, but slowly released at pH 7.4. Mannan and chitosan surface modification enhanced intracellular microparticle uptake by macrophages. Following intracellular macrophage antigen uptake, antigen release occurred in three different patterns: fast release from PLGA and MN-PLGA microparticles in endosomes/lysosomes, slow release from CS-PLGA microparticles in cytoplasm and a combination of fast release and slow release patterns from MN-CS-PLGA microparticles. Furthermore, chitosan coating modification increased the residence time of CS-PLGA and MN-CS-PLGA microparticles in the nasal cavity. In vivo immunogenicity studies indicated that MN-CS-PLGA microparticles induced stronger humoral and cell-mediated immune responses compared with PLGA, MN-PLGA and CS-PLGA microparticles. These results suggest that surface modification of pH-responsive PLGA microparticles with mannan and chitosan is a promising tool for nasal delivery of HBsAg.
Keywords: Antigen intracellular release; Chitosan; Intranasal vaccination; Mannan; PLGA microparticles; pH-responsive.
Copyright © 2016. Published by Elsevier B.V.
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