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- W4239704418 abstract "Abstract Background Neospora caninum causes infections in a wide range of intermediate hosts and remains a threatening disease worldwide because of the lack of effective drugs and vaccines. Our previous studies demonstrated that N. caninum 14-3-3 protein (Nc14-3-3), which is included in N. caninum extracellular vesicles (NEVs), can induce effective immune responses and stimulate cytokine expression in mouse peritoneal macrophages. However, whether Nc14-3-3 has a protective effect and its mechanisms are poorly understood.MethodsHere, we evaluated immune responses and protective effects of Nc14-3-3 against 2×10 7 Nc-1 tachyzoites. Antibody (IgG, IgGl and IgG2a) levels and Th1-type (IFN-γ and IL-12) and Th2-type (IL-4 and IL-10) cytokines in mouse serum; survival rates; survival time; and parasite burdens were detected.ResultsIn the present study, the immunostimulatory effect of Nc14-3-3 was confirmed, as it triggered Th1-type cytokine (IFN-γ and IL-12) production in mouse serum two weeks after the final immunization. Moreover, the immunization of C57BL/6 mice with Nc14-3-3 induced high IgG antibody levels and significant increases in CD8 + T lymphocytes in the spleens of mice, indicating that a significant cellular immune response was induced. Mouse survival rates and survival times were significantly prolonged after immunization survival rates were 40% for Nc14-3-3 immunization and 60% for NEV immunization, while mice that received GST, PBS, or blank control all died at 13, 9, and 8 days after intraperitoneal N. caninum challenge. In addition, qPCR analysis indicated that there was a lower parasite burden and milder pathological changes in the mice immunized with Nc14-3-3.ConclusionsOur data demonstrate the vaccination of mice with Nc14-3-3 elicits both cellular and humoural immune responses and provides partial protection against acute neosporosis. Thus, Nc14-3-3 could be an effective antigen candidate for vaccine development for neosporosis." @default.
- W4239704418 created "2022-05-12" @default.
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- W4239704418 date "2020-12-01" @default.
- W4239704418 modified "2023-10-11" @default.
- W4239704418 title "Protective Immunity Against Neospora Caninum Infection Induced by 14-3-3 Protein in Mice" @default.
- W4239704418 doi "https://doi.org/10.21203/rs.3.rs-114643/v1" @default.
- W4239704418 hasPublicationYear "2020" @default.
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