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  • Title: [Immunity and EGFPC3 expression of recombinant attenuated salmonella typhimurium carrying plasmid pcDNA3s and EGFPC3 in mice].
    Author: Fang XX, Wang DM, Shi YH, LE GW, Bai XP, Liu JW.
    Journal: Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi; 2007 Apr; 23(4):299-302. PubMed ID: 17428380.
    Abstract:
    AIM: To study the immune characterization of HBsAg DNA recombinant attenuated salmonella typhimurium vaccine and the expression of enhanced green fluorescence protein gene pEGFPC3 in mice. METHODS: Plasmid pcDNA3s and pEGFPC3 was transformed into attenuated salmonella typhimurium SL8786 by electricity instrument to construct recombinant vaccine SL8786/EGFPC3 and SL8786/pcDNA3s. Mice were immunized with the recombinant vaccine and the quantity of anti-HBs antibody in the sera was measured by time resolved fluorescence immunoassay(TRFIA), While the cytotoxocity of CTL was measured by LDH release assay. RESULTS: It produced strong specificity CTL response after taking SL8786/pcDNA3s orally to mice and anti-HBs was highest in 11 weeks. EGFPC3 expression in two mice spleen cells was detected by flow cytometry(FCM). EGFP masculine ratio is 19.20% and 17.36% respectively. but SL8786/pcDNA3 in two mice spleens cell EGFP masculine ratio only is 1.95% and 1.63%. The mice was taken SL8786/EGFPC3 orally after three weeks, fluorescence expression in its liver, spleen, kidney, chest gland, duodenum, muscle, etc. were observed. CONCLUSION: HBV DNA vaccine can induce specific cellular and humoral immune responses in vivo in mice by oral. Recombinant attenuated salmonella typhimurium SL8786/EGFPC3 we constructed. It has green fluorescence expression in mice's partial organization, and it offers a model for research gene engineering vaccine.
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