【摘要】 目的:探讨B细胞趋化因子(B-lymphocyte chemoattractant,BLC)对柯萨奇病毒B3融合基因疫苗pcDNA3/C3d3-sVP1免疫效果的影响。方法:将BALB/c小鼠随机分为4组,分别肌肉注射pcDNA3、pcDNA3/BLC、pcDNA3/C3d3-sVP1和含pcDNA3/BLC与pcDNA3/C3d3-sVP1的混合质粒,于免疫后不同时间检测小鼠血清的中和抗体滴度、特异性CTL杀伤活性;以LD50的CVB3病毒液感染已免疫小鼠,检测小鼠血中病毒滴度,观察存活情况以评价各种疫苗的免疫保护作用。结果:小鼠的中和抗体滴度随免疫次数增加而提高,混合组中和抗体滴度(42.17±1.43)和特异性CTL杀伤率(41.3%±3.51%)均明显高于pcDNA3/C3d3-sVP1组(P<0.05),而血中病毒滴度低于pcDNA3/C3d3-sVP1组;经致死量CVB3感染后,pcDNA3/BLC和pcDNA3/C3d3-sVP1混合免疫的小鼠生存率达44%,生存率高于其他各组。结论:BLC可显著提高C3d3-sVP1基因诱导的特异性免疫应答,增强基因疫苗对机体的免疫保护作用。更多还原

【Abstract】 Objective:To investigate the influence of B-lymphocyte chemoattractant on the immune response of CVB3 fusion gene vaccine pcDNA3/C3d3-sVP1.Methods:BALB/c mice were divided into 4 groups randomly,and injected intramuscularly with pcDNA3,pcDNA3/BLC,pcDNA3/C3d3-sVP1 and the combination with the plasmid pcDNA3/BLC and pcDNA3/C3d3-sVP1.At a certain time,they were measured for the titers for neutralizing antibodies,specific CTL cytotoxic activity.The protective efficacy of DNA vaccinations was evaluated by titers of blood viruses and survival rate.Results:The titers for antibodies increased with the time of inoculation.More specifically,the antibody titers(42.17±1.43) and the specific CTL cytotoxic activity(41.3%±3.51%) of the mice in the combination group were remarkably stronger than in the mice with pcDNA3/C3d3-sVP1(P<0.05),but the virus titers of blood was lower.After lethal CVB3 challenge,the protection of mice from death in the combination group with the plasmid pcDNA3/BLC and pcDNA3/C3d3-sVP1 was 44%.Survival curves indicated that the survive state of combination group was better than others.Conclusion:BLC can strongly enhance the specific immunity induced by C3d3-sVP1.更多还原