张 婷/陈 倩/汤树生/靳 溪/邹家杰/刘凤英/张 /肖希龙
(中国农业大学动物医学院药理和毒理教研室, 北京 100193)
Olaquindox weakened the antioxidant system in human hepatoma G2 cells
ZHANG Ting, CHEN Qian, TANG Shu_sheng, JIN Xi, ZOU Jia_jie, LIU Feng_ying, ZHANG Shen, XIAO Xi_long
(Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agriculture University, Beijing 100193, China)
【摘要】 目的: 观察喹乙醇对人肝癌细胞(HepG2)抗氧化系统的影响,探讨喹乙醇诱导HepG2细胞氧化性损伤的机制。 方法: 分别将0、200、400、800 μg/ml的喹乙醇作用于HepG2细胞24 h后,检测各组细胞内抗氧化酶/物的变化;另设800 μg/ml的喹乙醇作用于HepG2细胞3 h后,再用超氧化物歧化酶(SOD)(100 μg/ml)、过氧化氢酶(CAT)(100 μg/ml)及 SOD(100 μg/ml)+CAT(100 μg/ml)分别作用细胞3 h的各实验组,采用分子探针2’,7’_二氯荧光黄双乙酸盐(2,7_dichlorodihydrofluorescein diacetate, DCFDA)检测各组处理后细胞内活性氧含量的变化。 结果: 不同浓度的喹乙醇作用HepG2细胞24 h后,细胞总ATPase、Na+K+-ATPase 及 Ca2+Mg2+-ATPase 和细胞内SOD、谷胱甘肽(GSH)及谷胱甘肽过氧化物酶(GSH_PX)活性随喹乙醇浓度的升高而下降(P<0.05或P<0.01),且具有一定的剂量_效应关系,细胞内CAT活性较对照组下降(P<0.01),但无剂量_效应关系,而细胞内丙二醛(MDA)水平随喹乙醇浓度的升高而增加(P<0.05或P<0.01),且呈一定的剂量_效应关系。经喹乙醇(800 μg/ml)处理细胞后,再分别用CAT、SOD 及 SOD+CAT处理的各组,其ROS含量与单纯喹乙醇(800 μg/ml)组相比分别减少80%(P<0.01)、40%及95%(P<0.01)。 结论: 喹乙醇可使体外培养HepG2细胞的抗氧化系统受到一定的破坏,且产生的ROS形式以H2O2为主。
【关键词】 喹乙醇; 超氧化物歧化酶; 过氧化氢酶; 谷胱甘肽; 三磷酸腺苷酶; 活性氧
中图分类号: Q256,S859.83 文献标识码: A 文章编号: 1004-616X(2010)05-0361-05
【ABSTRACT】 OBJECTIVE: To investigate the effect of olaquindox on the antioxidant system in human hepatoma G2(HepG2) cells. METHODS: HepG2 cells were treated with 0, 200, 400 and 800 μg/ml olaquindox in 24 h. The activities of superoxide dismutase(SOD) and catalase(CAT), the level of malondialdehyde(MDA), the activities of glutathione (GSH) and glutathione peroxidase (GSH_PX), Na+K+_ATPase and Ca2+Mg2+-ATPase were measured. SOD or CAT, and the combination of SOD+CAT were incubated for 3 h with olaquindox_treated HepG2 cells. The levels of reactive oxygen species (ROS) were evaluated by 2, 7_dichlorodihydrofluorescein diacetate(DCFDA). RESULTS: Olaquindox decreased the levels of T_ATPase, Na+K+-ATPase and Ca2+Mg2+-ATPase, SOD,GSH ,GSH_PX, in HepG2 cells(P<0.05 or P<0.01), with a dose_response relationship. After HepG2 cells were treated with olaquindox, the activity of CAT was decreased when compared with the control(P<0.01). Olaquindox led to a dose_dependent increase in the level of MDA(P<0.05 or P<0.01). While HepG2 cells were treated with olaquindox (800 μg/ml), CAT,SOD and SOD+CAT reduced ROS about 80% ,40%and 95%, respectively(P<0.01). CONCLUSION: Olaquindox disrupted the antioxidant system in HepG2 cells. Our results indicated that olaquindox_induced HepG2 cells predominantly generated H2O2, which could be scavenged by CAT.
【KEY WORDS】 olaquindox; superoxide dismutase; catalase; glutathione; ATPase; reactive oxygen species
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收稿日期: 2010-03-25; 修订日期: 2010-05-13
基金项目: 长江学者和创新团队发展计划 (IRT0866)
作者简介: 张 婷 (1984- ),女,山西交城人,硕士,研究方向:分子与细胞毒理学。
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