期刊
MACROMOLECULAR BIOSCIENCE
卷 21, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mabi.202000375
关键词
chitosan; hepatitis E; immunogenicity; nanoparticles; oral vaccine
资金
- National Natural Science Foundation of China [31770998]
- Southeast University Key Project for Scientific Research and Training [201841027]
The study focused on developing oral vaccine nanoparticles using truncated capsid protein p146 for hepatitis E (HE) and utilized chitosan nanoparticles as a mucosal delivery system. The produced CS/p146 NPs exhibited stable dispersion, near-spherical shape with optimal size, high encapsulation efficiency, and low cytotoxicity with sustained-release effects. Immunogenicity experiments in mice showed that CS/p146 NPs induced higher antigen-specific systemic and mucosal immune responses compared to purified p146, highlighting their potential as HE oral vaccine candidates.
In a continuous effort to develop effective vaccines against hepatitis E (HE), oral vaccine nanoparticles using the truncated capsid protein p146 (aa460-605) are formulated and characterized. To improve the immunogenicity of p146, chitosan nanoparticles (CSNPs) are used as a mucosal delivery system. Next, the physical-chemical properties, cytotoxic effects in vitro, and immunogenicity in mice of the produced NPs are analyzed. The results show that the produced CS/p146 NPs are stable and well dispersive and display a near-spherical shape with a mean size of 200-300 nm. The findings also demonstrate high encapsulation efficiency (65-73.9%) and loading capacity (27.7-67.5%) of the formulated nanoparticles. Further, the CS/p146 NPs exhibit low cytotoxicity and an obvious sustained-release effect in vitro. Immunogenicity experiments in mice indicate that CS/p146 NPs can induce antigen-specific systemic and mucosal immune responses higher than the purified p146 do. Besides, the expression levels and mRNA transcription of Interleukin (IL)-4 in spleen cells of CS/p146 NPs-immunized mice are higher than those of p146, indicating that a Th2-mediated cellular immune response is activated by the CS/p146 NPs. Overall, the synthesized CS/p146 NPs display promising properties as a potential HE oral vaccine candidate.
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