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目的:研究乙苯染毒后耳蜗毛细胞株（HEI-OC1）细胞增殖及氧化指标的变化。方法:于2019年7至12月，设置乙苯浓度分别为0、30、60、90、300、600、900 μmol/L和3、6、9、10 mmol/L，共11个浓度组，用CCK-8法测定乙苯染毒24 h后HEI-OC1细胞增殖活性；以0、1、2、4、8、16、32、64 mmol/L乙苯处理细胞24 h，计算乙苯的半数抑制浓度。用0、6、9和12 mmol/L乙苯染毒HEI-OC1细胞24 h后，测定细胞内丙二醛（MDA）含量、超氧化物歧化酶（SOD）和谷胱甘肽过氧化物酶（GSH-Px）活力。结果:与0 mmol/L浓度组比较，6、9、12 mmol/L浓度HEI-OC1细胞存活率明显降低（n P<0.01）。乙苯对HEI-OC1细胞的半数抑制浓度为12.86 mmol/L（n R2=99.05）。不同浓度组（0、6、9、12 mmol/L）乙苯处理HEI-OC1细胞24 h，MDA含量、SOD和GSH-Px活力差异均有统计学意义（n F=65.11、6.48、22.85，n P<0.05）；与0 mmol/L浓度组比较，9、12 mmol/L浓度组HEI-OC1细胞MDA含量明显升高，12 mmol/L浓度组SOD活力明显降低，6、12 mmol/L浓度组GSH-Px活力明显降低，差异均有统计学意义（n P<0.05）。n 结论:乙苯可以抑制HEI-OC1细胞增殖，引起细胞氧化损伤。“,”Objective:To study the changes of proliferation and oxidation indexes of Cochlear hair cell line (HEI-OC1 cells) exposed to ethylbenzene.Methods:From July to December 2019, 11 groups with ethylbenzene concentrations of 0, 30, 60, 90, 300, 600, 900 μmol/L and 3, 6, 9, 10 mmol/L, were used to determine the proliferation activity of HEI-OC1 cells exposed to ethylbenzene for 24 hours, and the cells were treated with 0, 1, 2, 4, 8, 16, 32, 64 mmol/L ethylbenzene for 24 hours, then the 50% inhibitory concentration of ethylbenzene was calculated. After HEI-OC1 cells were exposed to 0, 6, 9 and 12 mmol/L ethylbenzene for 24 hours, the malondialdehyde (MDA) content, superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities were measured.Results:Compared with 0 mmol/L concentration group, the survival rate of HEI-OC1 cells at 6, 9, 12 mmol/L concentration was significantly decreased (n P<0.01) . The 50% inhibitory concentration of ethylbenzene on HEI-OC1 cells was 12.86 mmol/L (n R2=99.05) . There were significant differences in SOD and GSH-Px activity in HEI-OC1 cells treated with ethylbenzene at different concentrations (0, 6, 9, 12 mmol/L) for 24 hours (n F=65.11, 6.48, 22.85, n P<0.05) . Compared with 0 mmol/L concentration group, the MDA content of HEI-OC1 cells was significantly increased in 9 and 12 mmol/L concentration groups, the SOD activity was significantly decreased in 12 mmol/L concentration group, and the GSH-Px activity was significantly decreased in 6 and 12 mmol/L concentration groups.n Conclusion:Ethylbenzene can inhibit the proliferation of HEI-OC1 cells and cause oxidative damage.