ZEA、DON及其联合染毒对CTLL-2细胞因子分泌的影响

为研究镰刀菌毒素玉米赤霉烯酮（ZEA）、脱氧雪腐镰刀菌烯醇（DON）及其联合作用对动物免疫功能的影响，试验以CTLL-2细胞（细胞毒性T淋巴细胞株）为材料，用不同浓度的ZEA （0、5、10、20 μg/mL）、DON （0、0.5、1、2 μg/mL）及联合（空白组、5 μg/mL ZEA、0.5 μg/mL DON、5 μg/mL ZEA＋0.5 μg/mL DON）处理CTLL-2细胞48 h，采用ELISA法检测了细胞内及培养上清液中颗粒酶B （GZMB）、穿孔素（PFP）、干扰素γ（IFN-γ）和肿瘤坏死因子α（TNF-α）等细胞因子的含量。结果显示，ZEA、DON能够降低CTLL-2细胞胞内及培养上清液中PFP、GZMB、IFN-γ的浓度，增加TNF-α浓度，染毒组与对照组相比均有显著或极显著差异（P＜0.05；P＜0.01），且均呈剂量效应关系；ZEA、DON联合染毒表现为加性效应。结果表明，ZEA、DON及其联合作用可通过影响免疫细胞因子的分泌，降低免疫细胞杀伤活力，间接影响机体体液免疫和细胞免疫的负调节，从而导致动物机体免疫机能下降。

Effects of ZEA,DON and Their Combined Effects on the Secretion of Cytokines in CTLL-2 Cells

To analyze the effects of ZEA or/and DON on the immunologic function,CTLL-2 cell was used as experimental materials. After exposing the CTLL-2 cell to different concentrations of ZEA (0,5,10,20 μg/mL),DON (0,0.5,1,2 μg/mL) and ZEA+DON (blank group,5 μg/mL ZEA,0.5 μg/mL DON,5 μg/mL ZEA+0.5 μg/mL DON) for 48 h,the concentration of GZMB,PFP,IFN-γ and TNF-α in CTLL-2 cell and supernatant fluid were detected by ELISA method. The result showed that DON and ZEA could reduce the concentration of PFP,GZMB and IFN-γ in the CTLL-2 cells and the culture supernatant fluids,and increase the concentration of TNF-α. The intoxicated group had significant or extremely significant difference compared to control group (P <0.05;P <0.01),which showed the dose effect. The group exposed to the combined of ZEA and DON showed an additive effect. The result indicated that ZEA,DON and the two combined could reduce the killing activity of immunological cell by affecting the secretion of immunological cytokines, and indirectly affect the negative feedback regulation of humoral immunity and cellular immunity,which led to the decline of immune function in animals.