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Fabrication and characterization of DDAB/PLA-alginate composite microcapsules as single-shot vaccine

Author:
Yang, Meiyang, Yang, Tingyuan, Jia, Jilei, Lu, Ting, Wang, Hailin, Yan, Xueying, Wang, Lianyan, Yu, Lian, Zhao, Yue
Source:
RSC advances 2018 v.8 no.24 pp. 13612-13624
ISSN:
2046-2069
Subject:
alginates, cell-mediated immunity, chronic hepatitis B, compliance, cytokines, developing countries, encapsulation, gels, hepatitis B antigens, immune response, immunoglobulin G, microparticles, nanoparticles, particle size, phosphates, polylactic acid, quaternary ammonium compounds, response surface methodology, secretion, sodium chloride, toxicity, vaccination, vaccines
Abstract:
The most effective method to reduce chronic hepatitis B virus infection is the universal implementation of vaccination. The commercial aluminum-based vaccines need multiple-injection protocols for complete protection resulting in poor compliance in developing countries. It is necessary to develop single-shot vaccine formulations. In this study, novel antigen-loaded DDAB/PLA (didodecyldimethylammonium bromide/poly(lactic acid)) nanoparticles (NPs)-alginate composite microcapsules were developed as a single-shot vaccine. The hepatitis B surface antigen (HBsAg)-loaded DDAB/PLA NPs were successfully encapsulated into alginate microcapsules by a modified spray-solidification technique. The response surface method was applied to optimize the preparation parameters employing encapsulation efficiency of HBsAg and particle size of microcapsules as response variables. The antigen-loaded DDAB/PLA NPs-alginate composite microcapsules were prepared under these optimal conditions: the size of composite microcapsules was 24.25 μm, the Span value was 1.627, and the encapsulation efficiency of HBsAg was 68.4%. The obtained microcapsules were spherical gel microparticles with excellent dispersity and narrow size distributions. In vitro release profile indicated a slow release rate of encapsulated HBsAg especially in phosphate buffered saline solution. The microcapsules showed little toxicity in vivo. This vaccine delivery system could induce stronger immune responses by a single shot, which exhibited much higher cytokine secretion levels closely related to cellular immunity and comparable IgG titers to the traditional aluminum-adjuvanted vaccine with three shots.
Agid:
6182958