An oral vaccine against CVA16 (Coxsackievirus A16) was developed by constructing a recombinant&lt;i&gt; Lactococcus lactis&lt;/i&gt;

Zaixue Jiang,Baimao Zhong,Xiaomei Lu,Xingui Tian

doi:10.4314/tjpr.v19i5.3

An oral vaccine against CVA16 (Coxsackievirus A16) was developed by constructing a recombinant<i> Lactococcus lactis</i>

Zaixue Jiang, Baimao Zhong + Show 2 more

Open Access

https://doi.org/10.4314/tjpr.v19i5.3

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Abstract

Purpose: To develop an oral vaccine against CVA16 (Coxsackievirus A16) by constructing a recombinant Lactococcus lactis that expresses VP1 from CVA16.Method: An oral CVA16 vaccine was prepared by expressing CVA16 VP1 protein with Lactococcus lactis. CVA16 VP1 gene was incorporated into a Lactobacillus expression vector, namely, pNZ8148, and then expressed in NZ9000, a food-grade lactic acid bacterium which serves as a carrier for oral vaccines.Results: There was statistically significant difference in CVA16-specific IgG antibody level between NZ9000-pNZ8148-CVA16-VP1 group (0.49 ± 0.05) and control group (0.05 ± 0.00) when the antiserum was diluted 1:10 (t = 19.84; p < 0.05). Furthermore, the level of CVA16-specific IgA antibody in NZ9000- pNZ8148-CVA16-VP1 group (0.17 ± 0.02) was significantly higher than in control group (0.05 ± 0.00) following antiserum dilution of 1:10 (t =12.08; p < 0.05).Conclusion: A CVA16 oral vaccine made from Lactobacillus elicits protective antibodies against CVA16. Thus, it is a potential as oral vaccine against CVA16 but further studies in vivo are required to ascertain its safety and effectiveness. Keywords: Coxsackievirus A16, Hand, foot and mouth disease, Lactococcus lactis, Oral vaccine, Enterovirus 71

Highlights

Enterovirus 71 (EV71) and coxsackievirus A16 (CVA16) are the main pathogens that hand-footcause and-mouth disease (HFMD) [1,2,3,4]
The results suggest that the oral vaccine induced antibodies against CVA16 via intestinal mucosal immunity
The plasmid pNZ8148-CVA16VP1 was transformed into NZ9000 Lactococcus lactis bacteria

Summary

Introduction

Enterovirus 71 (EV71) and coxsackievirus A16 (CVA16) are the main pathogens that hand-footcause and-mouth disease (HFMD) [1,2,3,4]. A small number of children may present severe symptoms such as aseptic meningitis and acute flaccid paralysis [5,6]. With the use of vaccines against EV71, the level of severe HFMD caused by EV71 is decreased in children [7,8]. There are still no available clinical vaccines for CVA16. Inactivated vaccine, the most frequently used type of vaccine, has been used against EV71 in the clinics [9]. Inactivated vaccines are associated with some disadvantages, one of which is that their immune

Results

Discussion

Conclusion