151. Escherichia coli -Derived Outer Membrane Vesicles Deliver Galactose-1-Phosphate Uridyltransferase and Yield Partial Protection against Actinobacillus pleuropneumoniae in Mice.
- Author
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Quan K, Zhu Z, Cao S, Zhang F, Miao C, Wen X, Huang X, Wen Y, Wu R, Yan Q, Huang Y, Ma X, Han X, and Zhao Q
- Subjects
- Actinobacillus Infections pathology, Actinobacillus pleuropneumoniae immunology, Actinobacillus pleuropneumoniae pathogenicity, Adjuvants, Immunologic, Animals, Antibodies, Bacterial, Bacterial Outer Membrane Proteins immunology, Bacterial Vaccines genetics, Cell Proliferation, Cytokines metabolism, Disease Models, Animal, Escherichia coli genetics, Female, Immunity, Cellular, Immunity, Humoral, Immunoglobulin G, Lethal Dose 50, Lung pathology, Lymphocytes, Mice, Mice, Inbred BALB C, Neutrophils pathology, Protein Engineering, Recombinant Fusion Proteins genetics, Recombinant Fusion Proteins immunology, UTP-Hexose-1-Phosphate Uridylyltransferase genetics, UTP-Hexose-1-Phosphate Uridylyltransferase metabolism, Vaccination, Actinobacillus Infections immunology, Actinobacillus Infections prevention & control, Actinobacillus pleuropneumoniae drug effects, Bacterial Vaccines immunology, Escherichia coli metabolism, Immunization, Protein Transport immunology, UTP-Hexose-1-Phosphate Uridylyltransferase immunology
- Abstract
In our previous studies, we have identified several in vivo-induced antigens and evaluated their potential as subunit vaccine candidates in a murine model, in which the recombinant protein GalT showed the most potent immunogenicity and immunoprotective efficacy against Actinobacillus pleuropneumoniae . To exploit a more efficient way of delivering GalT proteins, in this study, we employed the widely studied E. coli outer membrane vesicles (OMVs) as a platform to deliver GalT protein and performed the vaccine trial using the recombinant GalT-OMVs in the murine model. Results revealed that GalT-OMVs could elicit a highly-specific, IgG antibody titer that was comparable with the adjuvant GalT group. Significantly higher lymphocyte proliferation and cytokines secretion levels were observed in the GalT-OMVs group. 87.5% and 50% of mice were protected from a lethal dose challenge using A. pleuropneumoniae in active or passive immunization, respectively. Histopathologic and immunohistochemical analyses showed remarkably reduced pathological changes and infiltration of neutrophils in the lungs of mice immunized with GalT-OMVs after the challenge. Taken together, these findings confirm that OMVs can be used as a platform to deliver GalT protein and enhance its immunogenicity to induce both humoral and cellular immune responses in mice.
- Published
- 2018
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