Human Enterovirus 71 DNA Vaccine Constructs Containing 5’UTR with Complete Internal Ribosome Entry Site Sequence Stimulated Improved Anti-Human Enterovirus 71 Neutralizing Immune Responses

Abstract

Recent improvement in the technologies for efficient delivery of DNA vaccines has renewed interest in the DNA-based vaccines. Several DNA-based vaccines against human enterovirus 71 (EV71), the causative agent for hand, foot and mouth disease (HFMD) have been developed. Here we examined the potential of improving the vaccines by inserting the EV71 5’ untranslated region (5’ UTR) containing the full length internal ribosome entry site (IRES) sequence to the EV71 VP1-based DNA vaccine constructs. Four vaccine constructs designated as 5’ UTR-VP1/EGFP, VP1/EGFP, 5’ UTR-VP1/pVAX and VP1/pVAX, were designed using the pEGFP-N1 and pVAX-1 expression vectors, respectively. Transfection of Vero cells with the vaccine constructs with the 5’-UTR
(5’-UTR-VP1/EGFP and 5’ UTR-VP1/pVAX) resulted in higher percentages of cells expressing the recombinant
protein in comparison to cells transfected with vectors without the 5’-UTR (67% and 57%, respectively). Higher
IgG responses (29%) were obtained from mice immunized with the DNA vaccine construct with the full length 5’ UTR. The same group of mice when challenged with life EV71 produced significantly higher neutralizing antibody (NAb) titers (>5-fold). These results suggest that insertion of the EV71 5’ UTR sequence consisting of the full length IRES to the EV71 DNA vaccine constructs improved the efficacy of the constructs with enhanced
elicitation of the neutralizing antibody responses.

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N. Mat-Rahim and S. AbuBakar, "Human Enterovirus 71 DNA Vaccine Constructs Containing 5’UTR with Complete Internal Ribosome Entry Site Sequence Stimulated Improved Anti-Human Enterovirus 71 Neutralizing Immune Responses," World Journal of Vaccines, Vol. 4 No. 1, 2014, pp. 33-43. doi: 10.4236/wjv.2014.41006.

Conflicts of Interest

The authors declare no conflicts of interest.

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