Abstract
Objectives
To produce and deliver Helicobacter pylori lipoprotein Lpp20 via using Lactococcus lactis with aim of developing an efficient way to use this protective antigen in vaccine formulation.
Results
An engineered L. lactis strain carrying the lpp20 gene from H. pylori was constructed. The inducible expression of Lpp20 in L. lactis was detected as a 20 kDa intracellular protein by SDS-PAGE. Lpp20 constituted 10 % of the L. lactis cellular proteins. The expression product was highly immunoreactive, as demonstrated by western blot assays using mouse anti-H. pylori sera. Animal experimentation showed that oral vaccination with the engineered strain excited significantly elevated levels of serum Lpp20-specific IgG antibodies in BALB/c mice (P < 0.05).
Conclusions
This report presents the first efficient expression and delivery of whole Lpp20 protein to the immunization sites by using L. lactis, demonstrating an efficient utilization mode of Lpp20 in anti-H. pylori vaccination.
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Acknowledgments
This study was funded by the Henan Innovation Center of Molecular Diagnosis and Laboratory Medicine (XTCX-2015-ZD2) and the China Postdoctoral Science Foundation (No. 200801273).
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Supplementary Table 1—Plasmid vectors and bacterial strains used.
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Zhang, R., Peng, X., Duan, G. et al. An engineered Lactococcus lactis strain exerts significant immune responses through efficient expression and delivery of Helicobacter pylori Lpp20 antigen. Biotechnol Lett 38, 2169–2175 (2016). https://doi.org/10.1007/s10529-016-2209-x
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DOI: https://doi.org/10.1007/s10529-016-2209-x