为了构建新型弓形虫DNA疫苗并鉴定,试验以弓形虫SAG1作为疫苗候选抗原,融合小鼠树突状细胞(DC)表面分子DEC-205的单链抗体(single chain antibody fragment against DEC-205,scFv DEC-205),构建可表达弓形虫速殖子的表面抗原SAG1和scFvD...为了构建新型弓形虫DNA疫苗并鉴定,试验以弓形虫SAG1作为疫苗候选抗原,融合小鼠树突状细胞(DC)表面分子DEC-205的单链抗体(single chain antibody fragment against DEC-205,scFv DEC-205),构建可表达弓形虫速殖子的表面抗原SAG1和scFvDEC-205-SAG1的DNA质粒,对该质粒进行酶切鉴定,同时用该质粒对真核细胞进行转染,对目标蛋白的表达情况进行鉴定。结果表明:经电泳、双酶切及测序证实目的基因大小与实际相符,重组质粒pVAX1-scFvDEC205-SAG1构建成功;经Western-blot和细胞免疫荧光试验证实重组质粒pVAX1-scFvDEC205-SAG1可成功表达目的蛋白。说明成功构建重组DNA疫苗pVAX1-scFvDEC205-SAG1并在体外表达。展开更多
To characterize the immune response induced by SAG1 encoding plasmid combined with IL 2 gene adjuvant in mice and to assess the protective effect of this vaccination against toxoplasmosis Methods Mice were co inje...To characterize the immune response induced by SAG1 encoding plasmid combined with IL 2 gene adjuvant in mice and to assess the protective effect of this vaccination against toxoplasmosis Methods Mice were co injected intramuscularly with plasmid encoding Toxoplasma gondii SAG1 plus murine IL 2 expression vector at a dose of 100 μg Booster immunizations were employed 2 more times at 3 week interval As controls, mice were inoculated with PBS or empty plasmid pcDNA3 Humoral and cellular responses were assayed using ELISA for the determination of Ab, Ab isotype and IFN γ, as well as IL 4 To detect the integration and dissemination of DNA in the injected mice, PCR and in situ hybridization were performed All mice were then infected with highly virulent RH tachyzoites of Toxoplasma gondii intraperitoneally Results Significant increases in specific IgG levels were observed in mice after immunization three times with SAG1 expression plasmid With respect to the IgG isotype, co inoculation of IL 2 expression plasmid enhanced the level of IgG2a and the production of IFN γ Challenging mice by vaccinating with combined plasmids with RH tachyzoites resulted in prolonged survival Conclusion Humoral and cytokine responses elicited by SAG1 DNA immunization can be modulated by co inoculation with IL 2 expression plasmid The use of DNA vaccine in combination with an appropriate cytokine gene to prevent T gondii infection warrants further investigation展开更多
文摘为了构建新型弓形虫DNA疫苗并鉴定,试验以弓形虫SAG1作为疫苗候选抗原,融合小鼠树突状细胞(DC)表面分子DEC-205的单链抗体(single chain antibody fragment against DEC-205,scFv DEC-205),构建可表达弓形虫速殖子的表面抗原SAG1和scFvDEC-205-SAG1的DNA质粒,对该质粒进行酶切鉴定,同时用该质粒对真核细胞进行转染,对目标蛋白的表达情况进行鉴定。结果表明:经电泳、双酶切及测序证实目的基因大小与实际相符,重组质粒pVAX1-scFvDEC205-SAG1构建成功;经Western-blot和细胞免疫荧光试验证实重组质粒pVAX1-scFvDEC205-SAG1可成功表达目的蛋白。说明成功构建重组DNA疫苗pVAX1-scFvDEC205-SAG1并在体外表达。
基金Supported by Shandong Provincial Natural Science Fund (No. ZR2009CM079)the Science and Technology Development Program of Shandong Province (No. 2006GG3202045)the Program for Changjiang Scholars and Innovative Research Team in Universities (No. IRT0723)~~
文摘To characterize the immune response induced by SAG1 encoding plasmid combined with IL 2 gene adjuvant in mice and to assess the protective effect of this vaccination against toxoplasmosis Methods Mice were co injected intramuscularly with plasmid encoding Toxoplasma gondii SAG1 plus murine IL 2 expression vector at a dose of 100 μg Booster immunizations were employed 2 more times at 3 week interval As controls, mice were inoculated with PBS or empty plasmid pcDNA3 Humoral and cellular responses were assayed using ELISA for the determination of Ab, Ab isotype and IFN γ, as well as IL 4 To detect the integration and dissemination of DNA in the injected mice, PCR and in situ hybridization were performed All mice were then infected with highly virulent RH tachyzoites of Toxoplasma gondii intraperitoneally Results Significant increases in specific IgG levels were observed in mice after immunization three times with SAG1 expression plasmid With respect to the IgG isotype, co inoculation of IL 2 expression plasmid enhanced the level of IgG2a and the production of IFN γ Challenging mice by vaccinating with combined plasmids with RH tachyzoites resulted in prolonged survival Conclusion Humoral and cytokine responses elicited by SAG1 DNA immunization can be modulated by co inoculation with IL 2 expression plasmid The use of DNA vaccine in combination with an appropriate cytokine gene to prevent T gondii infection warrants further investigation
