微小隐孢子虫重组BCG疫苗免疫保护作用观察

目的研究微小隐孢子虫重组BCG疫苗的免疫保护作用。方法 100只BALB/c小鼠随机分为4组,BCG组免疫BCG,载体组免疫含PMV262质粒的BCG(BCG-PMV262),实验组免疫rBCG-CP15/60-23(各组均为每鼠尾静脉注射0.1mL,接种物浓度均为106细菌/mL),对照组每鼠尾静脉注射0.05mol/LpH7.2PBS0.1mL。免疫后,每组分别随机选6只小鼠检测其血清抗体和脾细胞培养液中的CD4+、CD8+以及细胞因子水平,各组剩余小鼠进行攻击实验。结果 rBCG-CP15/60-23能诱发小鼠产生细胞免疫和体液免疫反应,小鼠血清抗体水平于免疫后2周逐渐升高,与BCG组和载体组差异显著(P均<0.01);实验组CD4+T细胞增殖明显,CD4+/CD8+比值显著升高(P<0.05);脾细胞培养液中白细胞介素2(IL-2)、IL-12、γ干扰素(IFN-γ)均有不同程度的升高,实验组IFN-γ和IL-2含量与对照组和BCG组差异显著(P均<0.05),IL-12水平组间差异无统计学意义(P>0.05)。各组小鼠经隐孢子虫卵囊攻击感染后,实验组小鼠卵囊排泄数量减少40%～60%,初始排卵囊时间延长2d,卵囊持续排出时间缩短5d;组间差异有统计学意义(P<0.05)。结论微小隐孢子虫重组BCG-CP15/60-23疫苗免疫小鼠后,能产生良好的免疫保护作用。

Observations on immunoprotection of recombinant BCG vaccine of Cryptosporidium parvum

To investigate the immunoprotection of the recombinant BCG vaccine of Cryptosporidium parvum (C. parvum),100 BALB/c mice were divided into 4 groups randomly and injected with rBCG-CP15/60-23 (experiment group),BCG (BCG group),BCG-PMV262 (vector group) and PBST (control group),respectively. Then the levels of CD+4,CD+8 and cytokines in supernatant as well as the splenocytes of IgG in serum were detected. Mice in each group were challenged with C. parvum for further observation. Results showed that rBCG-CP15/...