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Recombinant Lactococcus lactis co-expressing OmpH of an M cell-targeting ligand and IBDV-VP2 protein provide immunological protection in chickens
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Recombinant Lactococcus lactis co-expressing OmpH of an M cell-targeting ligand and IBDV-VP2 protein provide immunological protection in chickens
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Recombinant Lactococcus lactis co-expressing OmpH of an M cell-targeting ligand and IBDV-VP2 protein provide immunological protection in chickens
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Journal Article
Recombinant Lactococcus lactis co-expressing OmpH of an M cell-targeting ligand and IBDV-VP2 protein provide immunological protection in chickens
2018
Overview
•In our study, we expressed the IBDV antigenic VP2 protein in the cytoplasm of food-grade L. lactis NZ3900 with pNZ8149.•To enhance antigen delivery, we targeted gut M cells for antigen presentation.•The results of this study indicate r-L. lactis expressing foreign protein is a highly specific antigen expression and delivery system that can be used to induce the high level of neutralizing antibodies in immunized animals.
Infectious bursal disease virus (IBDV) is a highly contagious disease that results in enormous economic losses in the global poultry sector. Lactic acid bacteria are an appealing vehicle for the safe and effective delivery of heterologous protein antigens. Oral administration of the commensal bacterium Lactococcus lactis expressing recombinant fusion proteins has been used to elicit mucosal and systemic immune responses. In this study, a Lactococcus lactis NZ3900 strain co-expressing the outer membrane protein (Omp) H of the microfold (M) cell-targeting ligand and the viral capsid protein (VP)2 antigen of IBDV was genetically engineered, and its immunopotentiating capacity as an oral and injected vaccine in chickens was evaluated. Western blotting analysis demonstrated that VP2-OmpH was expressed in the cytoplasm of cells and had high immunoreactivity. An in vivo study showed that in the absence of any adjuvant, the recombinant L. lactis VP2-OmpH strain stimulated the immune response and protected against very virulent IBDV challenge in 100% and 80% of chickens immunized by injection and oral administration, respectively. Moreover, the antiviral neutralizing antibody titers induced by injection administration were higher than those induced by oral administration. Mucosal secretory IgA titers induced by oral administration were higher than those induced by injection administration. These results suggested that the recombinant L. lactis VP2-OmpH strain is a promising candidate vaccine to prevent IBDV infection.
