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Journal of Applied Microbiology, Vol.119, No.4, 1196-1205, 2015
Enterovirus71 virus-like particles produced from insect cells and purified by multistep chromatography elicit strong humoral immune responses in mice
Aims: The study aims to develop a novel multistep chromatographic purification process for human enterovirus71 virus-like particles (VLPs) produced from insect cells (Sf9) infected with recombinant baculovirus. Methods and Results: Sf9 cells were maintained in the Wave Bioreactor system 20/50, and harvested when the viability decreased to 75% after infected with Bac-P1-3CD at the multiplicity of infection (MOI) of 1. After sonication and centrifugation, EV71 VLPs were purified with Capto (TM) Core 700, Capto (TM) adhere and Capto (TM) butyl. The purity was then determined by SDS-PAGE, Western blotting and high-performance liquid chromatography (HPLC), while the diameter of purified EV71 VLPs was analysed by Dynamic Light Scattering (DLS) and Transmission electron microscopy (TEM). Immunization of BALB/c mice and serum collection were performed after contamination analysis, and neutralization antibodies were then analysed by pseudovirus-based microneutralization assay. Results showed that these purified EV71 VLPs can be successfully purified with similar to 31.52% yield and >95% purity. They could elicit stronger neutralization antibodies in mice compared with those produced from formalin-inactivated EV71 virus. Conclusions: Our results demonstrated that EV71 VLPs can be purified with the multistep chromatographic protocol. Significance and Impact of the Study: This work presents a novel multistep chromatographic technique, an effective way of purifying EV71 VLPs with high purity. This purification process can thus serve as foundation for further development of industrial-scale production process of EV71 VLP vaccine candidates.