亚砷酸钠诱导人膀胱上皮永生化细胞氧化损伤作用观察

摘要

目的 观察亚砷酸钠(NaAsO2)诱导人膀胱上皮永生化细胞(SV-HUC-1)氧化损伤作用.方法 以不同浓度NaAsO2[0(对照)、1、2、4、8、10μmol/L]对SV-HUC-1细胞染砷24 h,利用流式细胞仪检测细胞内活性氧(ROS)水平,采用酶联免疫吸附实验(EHSA法)检测细胞内硝基酪氨酸(NT)含量和细胞培养液中8-羟基脱氧鸟嘌呤核苷(8-OHdG)水平.结果 1、2、4、8、10 μmol/L染砷组SV-HUC-1细胞ROS水平(81.76±4.91、95.23±2.17、126.61±17.95、126.74±27.77、114.18±9.65)明显高于对照组(69.84±1.28,P＜ 0.05或＜ 0.01),ROS水平与染砷剂量呈显著正相关(r=0.818,P＜ 0.01).10 μmol/L染砷组SV-HUC-1细胞内NT含量[ (919.66±206.33)μg/L]显著高于对照组[(238.19±38.28) μg/L,P＜ 0.01],NT含量与染砷剂量呈显著正相关(r=0.617,P＜0.01).各组细胞培养液中8-OHdG含量比较,差异无统计学意义(F=2.127,P＞0.05).结论 NaAsO2能够引起SV-HUC-1细胞氧化损伤.%Objective To study the state of oxidative injury induced by sodium arsenite(NaAsO2) in SV-40-immortalized normal uroepithelial (SV-HUC-1 ) cells.Methods SV-HUC-1 cells were exposed to different concentrations of NaAsO2[0(control),1,2,4,8,10 μmol/L] for 24 h,intracellular reactive oxygen species (ROS) was determined by flow cytometry,and the content ofintracellular nitrotyrosine(NT) and the 8-Hydroxydeoxyguanosine (8-OHdG) levels of cell culture medium were detected by enzyme linked immunosorbent assay (ELISA).Results After 24 h treatment,ROS levels(81.76 ± 4.91,95.23 ± 2.17,126.61 ± 17.95,126.74 ± 27.77,114.18 ± 9.65) of SV-HUC-1 cells in the 1,2,4,8,10 μmol/L NaAsO2 exposure groups were significantly higher than those of the control group (69.84 ± 1.28,P ＜ 0.05 or ＜ 0.01 ),ROS levels and exposure dose were positively correlated significantly(r =0.818,P＜ 0.01); the content of NT in the 10 μmol/L NaAsO2 exposure group[(919.66 ± 206.33) μg/L] was significantly higher than that in the control group[ (238.19 ± 38.28)μg/L,P ＜ 0.01 ],NT content and dye concentrations of arsenic also had dose-response relationship (r =0.617,P ＜ 0.01); after 24 h the cells were treated with arsenic,no significant difference of 8-OHdG content in the culture medium was observed(F =2.127,P ＞ 0.05 ).Conclusion NaAsO2 can cause SV-HUC-1 cell oxidative damage.