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To compare with the effects of the GM-CSF and IL-2 used as adjuvants in the baculovirus vaccine, we used genetic engineering to construct the recombinant baculovirus rBV-LMI-F and with GM-CSF and IL-2 to immunized chickens. Then, we compared the concentration of the neutralizing antibody and cytokines to determine the immunostimulatory effects of GM-CSF and IL-2. GM-CSF induced higher levels of antibodies and cytokines in chickens at 28 d and 42 d post-vaccination. In conclusion, GM-CSF could elicit higher serum antibody and cytokines responses and improved the effects of Baculovirus vaccine.
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It has been shown that cytokines can act as molecular adjuvant to enhance the immune response induced by DNA vaccines, but it is unknown whether interleukin 33 (IL-33) can enhance the immunocontraceptive effect induced by DNA vaccines. In the present study, we explored the effects of murine IL-33 on infertility induced by Lagurus lagurus zona pellucida 3 (Lzp3) contraceptive DNA vaccine administered by the mucosal route. Plasmid pcD-Lzp3 and plasmid pcD-mIL-33 were encapsulated with chitosan to generate the nanoparticle chi-(pcD-Lzp3+pcD-mIL-33) as the DNA vaccine. Sixty female ICR mice, divided into 5 groups (n=12/group), were intranasally immunized on days 0, 14, 28, and 42. After intranasal immunization, the anti-LZP3-specific IgG in serum and IgA in vaginal secretions and feces were determined by ELISA. The results showed that chi-(pcD-Lzp3+pcD-mIL-33) co-immunization induced the highest levels of serum IgG, secreted mucosal IgA, and T cell proliferation. Importantly, mice co-immunized with chi-(pcD-Lzp3+pcD-mIL-33) had the lowest birth rate and mean litter size, which correlated with high levels of antibodies. Ovaries from infertile female mice co-immunized with chi-(pcD-Lzp3+pcD-mIL-33) showed abnormal development of ovarian follicles, indicated by atretic follicles and loss of oocytes. Our results demonstrated that intranasal delivery of the molecular adjuvant mIL-33 with chi-pcD-Lzp3 significantly increased infertility by enhancing both systemic and mucosal immune responses. Therefore, chi-(pcD-Lzp3+pcD-mIL-33) co-immunization could be a strategy for controlling the population of wild animal pests.
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Objective To investigate the cellular and humoral immune responses and protective effect induced by co-immunization with two multi-epitope combinant antigens. Methods Mice were co-im-munized with the muhi-epitope HCV-T and HCV-E1 antigens three times. Sera antibodies IgG, IgG1 and IgG2a were tested by ELISA. Spleens from BALB/c mice immunized were removed 10 days after the last im-munization. CTL activity was assessed using LDH cytotoxicity assay kit. IFN-γ- and IL-4-secreting cells were quantified using ELISPOT kit. Two weeks after the final immunization, the mice were challenged sub-cutaneously(s, c. ) at the back with 106 SP2/0-NS3 cells, and protective effect was observed. For therapy, 106 SP2/0-NS3 cells were implanted into the back of BALB/c mice. Seven days later, mice were immuniza-tion three times. Therapy effect was observed. Results Co-immunization with HCV-T and HCV-E1 induced high tiers of HCV-El-specific IgG, IgG1 and IgG2a antibodies, and high level of CTL activity. Synergistic effect in frequencies of both specific IFN-γ-secreting cells and IL-4-secreting cells was observed in mice co-immunized. Prophylactic as well as therapeutic administration of mT + mE1 in mice led to protecting mice against SP2/0-NS3 cells. These results suggested that mT + mE1 was potential as a prophylactic as well as therapeutic HCV vaccine. Conclusion Co-immunization with HCV-T + HCV-EI induced protective humor-al and cellular immune response. HCV-T + HCV-E1 was potential as a recombinant HCV vaccine.
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Objective To observe the specific cellular immune response induced by co-immunization of DNA vaccine of Mtb8.4 and plasmid encoding human interleukin 12(hIL-12)in mice.Methods Fifteen C57BL/6N mice were divided into following groups:Mtb8.4 gene vaccine plus plasmid of hIL-12,Mtb8.4 gene vaccine,BCG,empty vector alone and PBS.Mice were immunized intramuscularly in both hind limbs three times at the intervals of three weeks or once subcutaneously with 1?106 of viable M.bovis BCG Pasteur at the time of the first DNA immunization.The level of IFN-? in supernatant of spleno-lymphocyte cultures was measured by ELISA.CTL activities of spleno-lymphocyte were detected with LDH release assay.Results The levels of IFN-? and IL-2 in supernatant of spleno-lymphocyte cultures in the group of Mtb8.4 gene vaccine plus plasmid of hIL-12 were significantly higher than that of group of Mtb8.4 alone(P