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- W2626249972 abstract "Toxoplasma gondii, an obligatory intracellular protozoan, can cause serious public health problems and economic losses worldwide. Two novel dense granule proteins (GRA17 and GRA23) were recently identified as T. gondii-secreted proteins which are localized to the parasitophorous vacuole membrane (PVM) and can mediate the movement of small molecules between the host cell and parasitophorous vacuole (PV). In the present study, we evaluated the protective immunity induced by DNA vaccination with genes encoding GRA17 and GRA23 against acute toxoplasmosis in mice. Eukaryotic expressing plasmids pVAX-TgGRA17 and pVAX-TgGRA23 were constructed. Then, BALB/c mice were intramuscularly immunized with pVAX-TgGRA17, pVAX-TgGRA23, or pVAX-TgGRA17 + pVAX-TgGRA23 followed by challenge infection with the highly virulent RH strain of T. gondii. The specific immune responses and protective efficacy against T. gondii were examined by cytokine and serum antibody measurements, lymphocyte proliferation assays, flow cytometry of lymphocytes and the survival time after challenge. Our results showed that mice immunized with pVAX-TgGRA17, pVAX-TgGRA23, or pVAX-TgGRA17 + pVAX-TgGRA23 induced specific humoral and cellular responses, with higher level of IgG antibody, increased levels of Th1-type cytokines IFN-γ and IL-12 (p70), and CD3+CD4+CD8− and CD3+CD8+CD4− T cells, as well as prolonged survival time (9.1 ± 0.32 days for pVAX-TgGRA17, 10.8 ± 0.79 days for pVAX-TgGRA23, and 12.6 ± 2.55 days for pVAX-TgGRA17 + pVAX-TgGRA23) compared to the blank control (7.11 ± 0.33 days), PBS control (7.22 ± 0.44 days), and pVAX I control (7.11 ± 0.33 days). These results demonstrated that both TgGRA17 and TgGRA23 are potential vaccine candidates, TgGRA23 has a better immunogenicity, and co-immunization of pVAX-TgGRA17 and pVAX-TgGRA23 induces better protective efficacy." @default.
- W2626249972 created "2017-06-23" @default.
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- W2626249972 date "2017-08-01" @default.
- W2626249972 modified "2023-09-24" @default.
- W2626249972 title "Evaluation of protective immunity induced by DNA vaccination with genes encoding Toxoplasma gondii GRA17 and GRA23 against acute toxoplasmosis in mice" @default.
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- W2626249972 doi "https://doi.org/10.1016/j.exppara.2017.06.002" @default.
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