AIM:To develop a tumor DNA vaccine encoding a fusion protein of murine AFP and CTLA4,and to study its ability to induce specific CTL response and its protective effect against AFP-producing tumor.METHODS:Murine α-fet...AIM:To develop a tumor DNA vaccine encoding a fusion protein of murine AFP and CTLA4,and to study its ability to induce specific CTL response and its protective effect against AFP-producing tumor.METHODS:Murine α-fetoprotein (mAFP) gene was cloned from total RNA of Hepal-6 cells by RT-PCR.A DNA vaccine was constructed by fusion murine α-fetoprotein gene and extramembrane domain of murine CTLA4 gene.The DNA vaccine was identified by restriction enzyme analysis,sequencing and expression.EL-4 (mAFP) was developed by stable transfection of EL-4 cells with pmAFP.The frequency of cells producing IFN-γ in splenocytes harvested from the immunized mice was measured by ELISPOT.Mice immunized with DNA vaccine were inoculated with EL-4(mAFP) cells in back to observe the protective effect of immunization on tumor. On the other hand,blood samples were collected from the immunized mice to check the functions of liver and kidney.RESULTS:1.8kb mAFP cDNA was cloned from total RNA of Hepal-6 cells by RT-PCR.The DNA vaccine encoding a fusion protein of mAFP-CTLA4 was constructed and confirmed by restriction enzyme analysis,sequencing and expression.The expression of mAFP mRNA in EL-4 (mAFP) was confirmed by RT-PCR.The ELISPOT results showedthat the number of IFN-γ-producing cells in pmAFP-CTLA4 group was significantly higher than that in pmAFP,pcDNA3.1 and PBS group.The tumor volume in pmAFP-CTLA4 group was significantly smaller than that in pmAFP,pcDNA3.1 and PBS group, respectively. The hepatic and kidney functions in each group were not altered.CONCLUSION: AFP-CTLA4 DNA vaccine can stimulate potent specific CTL responses and has distinctive antitumor effect on AFP-producing tumor.The vaccine has no impact on the function of mouse liver and kidney.展开更多
Objective To study the effect of transforming growth factor-α (TGF-α) on early stage of embryo implantation.Methods Mouse blastocysts were cultured in vitro in medium containing various concentrations of TGF-α. Bla...Objective To study the effect of transforming growth factor-α (TGF-α) on early stage of embryo implantation.Methods Mouse blastocysts were cultured in vitro in medium containing various concentrations of TGF-α. Blastocyst implantation capacity was evaluated by calculating the percentage of embryos with attachment or outgrowth. Matrix metalloproteinases (MMPs) secretion of blastocysts was observed using gelatin zymography. Results There was no significant difference in the percentage of attachment between control and TGF-α treated groups, but the percentage of outgrowth of TGF-α treated groups was significantly higher than that of the control group after 24h culturing. Gelatin zymography showed that blastocysts cultured in TGF-α treated groups started secreting MMPs earlier than those in the control group.Conclusion TGF-α is involved in regulating the mouse embryo implantation process by promoting blastocyst outgrowth and secreting matrix matalloproteinases.展开更多
文摘AIM:To develop a tumor DNA vaccine encoding a fusion protein of murine AFP and CTLA4,and to study its ability to induce specific CTL response and its protective effect against AFP-producing tumor.METHODS:Murine α-fetoprotein (mAFP) gene was cloned from total RNA of Hepal-6 cells by RT-PCR.A DNA vaccine was constructed by fusion murine α-fetoprotein gene and extramembrane domain of murine CTLA4 gene.The DNA vaccine was identified by restriction enzyme analysis,sequencing and expression.EL-4 (mAFP) was developed by stable transfection of EL-4 cells with pmAFP.The frequency of cells producing IFN-γ in splenocytes harvested from the immunized mice was measured by ELISPOT.Mice immunized with DNA vaccine were inoculated with EL-4(mAFP) cells in back to observe the protective effect of immunization on tumor. On the other hand,blood samples were collected from the immunized mice to check the functions of liver and kidney.RESULTS:1.8kb mAFP cDNA was cloned from total RNA of Hepal-6 cells by RT-PCR.The DNA vaccine encoding a fusion protein of mAFP-CTLA4 was constructed and confirmed by restriction enzyme analysis,sequencing and expression.The expression of mAFP mRNA in EL-4 (mAFP) was confirmed by RT-PCR.The ELISPOT results showedthat the number of IFN-γ-producing cells in pmAFP-CTLA4 group was significantly higher than that in pmAFP,pcDNA3.1 and PBS group.The tumor volume in pmAFP-CTLA4 group was significantly smaller than that in pmAFP,pcDNA3.1 and PBS group, respectively. The hepatic and kidney functions in each group were not altered.CONCLUSION: AFP-CTLA4 DNA vaccine can stimulate potent specific CTL responses and has distinctive antitumor effect on AFP-producing tumor.The vaccine has no impact on the function of mouse liver and kidney.
文摘Objective To study the effect of transforming growth factor-α (TGF-α) on early stage of embryo implantation.Methods Mouse blastocysts were cultured in vitro in medium containing various concentrations of TGF-α. Blastocyst implantation capacity was evaluated by calculating the percentage of embryos with attachment or outgrowth. Matrix metalloproteinases (MMPs) secretion of blastocysts was observed using gelatin zymography. Results There was no significant difference in the percentage of attachment between control and TGF-α treated groups, but the percentage of outgrowth of TGF-α treated groups was significantly higher than that of the control group after 24h culturing. Gelatin zymography showed that blastocysts cultured in TGF-α treated groups started secreting MMPs earlier than those in the control group.Conclusion TGF-α is involved in regulating the mouse embryo implantation process by promoting blastocyst outgrowth and secreting matrix matalloproteinases.
