OBJECTIVE:To investigate the role of reactive oxygen species(ROS) in isoniazid(INH)-induced DNA damage in L-02 cells and the protection by quercetin.METHODS:L-02 cells were divided into several groups:blank control,INH(10 mmol/L),quercetin low dose(10 mmol/L INH +25 μmol/L quercetin) and high dose(10mmol/L INH +50 μmol/L quercetin).After cells were treated for 24 hours,DNA damage was detected by using the Comet test;ROS generation and mitochondrial membrane potential were evaluated by application of fluores...