Objective:To investigate the effect of high dose insulin on the reactive oxygen species(ROS)expression in cultured human retinal pigment epithelial(RPE)cells under normal and high glucose condition.Methods: Human RPE cells were cultured in vitro and divided into four groups:control group(gluocose 5.6 mmol·L-1), high dose insulin group(gluocose 5.6mmol·L-1+insulin 104U·L-1), high glucose group(glucose 30 mmol·L-1), high dose insulin and high glucose group(gluocose 30mmol·L-1+insulin 104U·L-1).Then ROS changes were detected with flow cytometry.Results:Compared to the control,the ROS expression increased in treated groups (t=24.0,4.203,19.562 respectively,P<0.05).Conclusion:The higher expression of ROS in cultured human RPE cells by high dose insulin combined with high glucose may be one of the reasons of the deterioration of the diabetic retinopathy caused by intensive insulin therapy. |