华支睾吸虫成虫抗原和排泄分泌产物对T细胞的作用研究

目的观察华支睾吸虫成虫抗原(Crude antigen,CA)、排泄/分泌产物(excretory-secretory products,ESPs)对T细胞的作用。方法体外分离小鼠骨髓细胞诱导分化为未成熟骨髓树突状细胞(immature DC,iDC);磁珠分选仪分选小鼠脾脏细胞的初始CD4+T细胞;流式细胞术检测DC、CD4+T细胞的纯度;抗原刺激DC细胞,实验分为PBS阴性对照组,LPS阳性对照组,CA和ESPs刺激组;负载抗原后的DC细胞与分选的CD4+T细胞共培养72h;Real time-PCR检测T-bet、GATA3mRNA的相对表达量;ELISA检测细胞培养上清中IFN-γ、IL-4细胞因子的表达量。结果与PBS组相比,ESPs刺激组Tbet、GATA3mRNA表达水平升高(P0.05),而CA刺激组T-bet、GATA3 mRNA表达水平差异不显著;与PBS组相比,ESPs刺激组细胞因子IFN-γ、IL-4的含量均升高(P0.05),CA刺激组仅IFN-γ的分泌增高(P0.05),IL-4无明显变化。结论 CA可能诱导宿主产生Th1型免疫应答,ESPs可能诱导宿主产生Th1型、Th2型免疫应答。

Effects of crude antigen and excretory-secretory products of Clonorchis sinensis on T cells

We investigated the roles of the crude antigen(CA) of Clonorchis sinensis and excretory secretory products (ESPs) in the polarization of Th1 and Th2 cells.Bone marrow-derived cells were generated from BALB/c mice and isolated into immature DCs;immature DCs were then treated with either CA (CA stimulated group),ESPs (ESPs stimulated group),LPS (positive control group) or PBS (negative control group) for 24 hours.Then the CD4+T cells were isolated from mouse spleen by using anti mouse-CD4 Microbeads,and further cocultured with stimulated DCs for another 72 hours.The purities of DCs and CD4+ T cells were evaluated by flow cytometry and the expressing levels of T-bet mRNA and GATA-3 mRNA were detected by real-time PCR.ELISA was used to detect the levels of IFN-γ and IL-4 cytokines in the supernatant.mRNA levels of T-bet and GATA-3 in the ESPs group were higher than those in PBS-stimulated group (P＜0.05).The concentrations of IFN-γ and IL-4 cytokines in the culture were increased in the ESPs group,compared with PBS stimulated group(P＜0.05).IFN-γ but not IL-4 was increased in CA group (P＜0.05).The results implied that CA might play a role in Th1 type immune response,and ESPs likely play roles in both Th1 and Th2 immune responses.