焦炉逸散物致HL-60细胞急性损伤及机制研究

Mechanism of coke oven emissions-induced acute toxicity in HL-60 cells

目的建立焦炉逸散物(COE)对离体培养的人白血病细胞株HL-60细胞的染毒模型,探讨COE对血液细胞的急性毒性作用及机制。方法取对数生长期HL-60细胞,分别以终浓度为2.5、5.0、10.0、20.0 mg/L的COE染毒并培养24 h后,以CCK-8法检测细胞存活率,以乳酸脱氢酶释放法检测细胞毒性,以2',7'-二氯荧光素二乙酸酯荧光探针法和硝基蓝四氮唑染料法检测细胞活性氧(ROS)水平,以蛋白免疫印迹法检测核转录因子κB(NF-κB)信号通路蛋白表达情况。结果随着COE染毒剂量的增加,HL-60细胞毒性上升(P<0.01),细胞存活率下降(P<0.01),细胞内ROS水平下降(P<0.01),细胞外ROS水平上升(P<0.01),均呈剂量-效应关系。4个剂量组HL-60细胞p-IκBα和p-NF-κB p65蛋白相对表达水平均高于对照组(P<0.05),但均无剂量-效应关系。结论 COE可导致HL-60细胞急性损伤,呈剂量-效应关系;其作用机制可能与COE诱导HL-60细胞发生ROS释放与清除失衡,进而导致NF-κB信号通路活化有关。HL-60细胞可作为COE对血液细胞毒性分析的常用细胞模型。

Objective To establish the cell model using human leukemia cell line HL-60 for exposure of coke oven emissions（ COE） in vitro and to explore the mechanism of COE-induced acute toxicity in HL-60 cells. Methods HL-60 cells were collected in their logarithmic growth phase and cultured in medium that had final concentrations of COE in 2. 5,5. 0,10. 0 and 20. 0 mg / L for 24 hours. Cell survival rate was examined by CCK-8 assay. The cytotoxicity was evaluated using lactate dehydrogenase release assay. Reactive oxygen species（ ROS） production was determined by the 2＇,7＇-dichlorofluorescein diacetate and nitroblue tetrazolium method. The activation of nuclear factor-κB（ NF-κB） pathway was evaluated by western blot. Results With the increasing exposure concentrations of COE,the cytotoxicity of HL-60 cells increased（ P〈0. 01）,the cell survival rate decreased（ P〈0. 01）,intracellular ROS decreased（ P〈0. 01）,whereas extracellular ROS increased（ P〈0. 01）. These changes had a dose-effect relationship. The levels of phospho-nuclear factor-kappa B p65 and phospho-inhibitor of kappa Bα were higher in all the COE-treated cells compared with untreated cells（ P〈0. 05）,with no dose-effect relationship. Conclusion COE could cause acute toxicity in HL-60 cells in a doseeffect relationship. The mechanism may be related to the COE-induced in-balanced ROS release and removal,leading to the activation of NF-κB pathway. HL-60 cells can be used as a common cell line for COE hematotoxicity analysis.