Assessment of the immunogenicity and protective efficiency of a novel dual-promoter DNA vaccine, harboring SAG1 and GRA7 genes, from RH strain of Toxoplasma gondii in BALB/c mice

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2019
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Abstract
Assessment of the immunogenicity and protective efficiency of a novel dual-promoter DNA vaccine, harboring SAG1 and GRA7 genes, from RH strain of Toxoplasma gondii in BALB/c mice Sara Ayazian Mavi,1 Mohammad Hossein Modarressi,2 Mehdi Mohebali,1,3 Saeedeh Shojaee,1 Hojjat Zeraati,4 Aref Teimouri,1,5 Hossein Keshavarz1,31Department of Medical Parasitology and Mycology, Tehran University of Medical Sciences, Tehran, Iran; 2Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran; 3Center for Research of Endemic Parasites of Iran, Tehran University of Medical Sciences, Tehran, Iran; 4Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; 5Students Scientific Research Center, Tehran University of Medical Sciences, Tehran, IranBackground: Toxoplasmosis, a protozoan parasitic disease caused by Toxoplasma gondii, has been a serious human and veterinary medicine problem with global distribution. In the current study, we assessed immunogenicity and protective efficiency of a novel dual-promoter DNA vaccine, harboring SAG1 and GRA7 genes, from RH strain of Toxoplasma gondii (T. gondii) with or without CpG-ODN as adjuvant in a murine model.Methods: BALB/c mice were immunized intramuscularly with pVitro-SAG1-GRA7 alone and pVitro-SAG1-GRA7 with CpG-ODN three times at three-week intervals. Enzyme-linked immunosorbent assay (ELISA) was used to assess total IgG, IgG1 and IgG2a antibodies and gamma interferon (IFN-γ) and interleukin-10 (IL-10) cytokines in mice sera. Four weeks post final vaccination, MTT assay and lethal challenge-infection with 1×103 tachyzoites of T. gondii RH strain were carried out to assess stimulation index (SI) and mice survival time, respectively.Results: The IgG levels in mice immunized with multicomponent vaccines, including pVitro-SAG1–GRA7 alone and pVitro-SAG1–GRA7 with CpG-ODN, were significantly higher than those in control mice or single-gene DNA-vaccinated ones (P
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Authors Sara Ayazian Mavi, Mohammad Hossein Modarressi, Mehdi Mohebali, Saeedeh Shojaee, Hojjat Zeraati, Aref Teimouri, Hossein Keshavarz
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Journal Infection and drug resistance
Year 2019
DOI
10.2147/IDR.S209270
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