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Viruses 2017, 9(11), 312; https://doi.org/10.3390/v9110312

Oral Delivery of Probiotics Expressing Dendritic Cell-Targeting Peptide Fused with Porcine Epidemic Diarrhea Virus COE Antigen: A Promising Vaccine Strategy against PEDV

1
College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China
2
College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
3
Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin 150030, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 22 September 2017 / Revised: 19 October 2017 / Accepted: 23 October 2017 / Published: 25 October 2017
(This article belongs to the Section Antivirals & Vaccines)
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Abstract

Porcine epidemic diarrhea virus (PEDV), an enteric coronavirus, is the causative agent of porcine epidemic diarrhea (PED) that damages intestinal epithelial cells and results in severe diarrhea and dehydration in neonatal suckling pigs with up to 100% mortality. The oral vaccine route is reported as a promising approach for inducing protective immunity against PEDV invasion. Furthermore, dendritic cells (DCs), professional antigen-presenting cells, link humoral and cellular immune responses for homeostasis of the intestinal immune environment. In this study, in order to explore an efficient oral vaccine against PEDV infection, a mucosal DC-targeting oral vaccine was developed using Lactobacillus casei to deliver the DC-targeting peptide (DCpep) fused with the PEDV core neutralizing epitope (COE) antigen. This probiotic vaccine could efficiently elicit secretory immunoglobulin A (SIgA)-based mucosal and immunoglobulin G (IgG)-based humoral immune responses via oral vaccination in vivo. Significant differences (p < 0.05) in the immune response levels were observed between probiotics expressing the COE-DCpep fusion protein and COE antigen alone, suggesting better immune efficiency of the probiotics vaccine expressing the DC-targeting peptide fused with PEDV COE antigen. This mucosal DC-targeting oral vaccine delivery effectively enhances vaccine antigen delivery efficiency, providing a useful strategy to induce efficient immune responses against PEDV infection. View Full-Text
Keywords: Lactobacillus; PEDV COE antigen; dendritic cell-targeting peptide; oral vaccine Lactobacillus; PEDV COE antigen; dendritic cell-targeting peptide; oral vaccine
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Wang, X.; Wang, L.; Huang, X.; Ma, S.; Yu, M.; Shi, W.; Qiao, X.; Tang, L.; Xu, Y.; Li, Y. Oral Delivery of Probiotics Expressing Dendritic Cell-Targeting Peptide Fused with Porcine Epidemic Diarrhea Virus COE Antigen: A Promising Vaccine Strategy against PEDV. Viruses 2017, 9, 312.

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