Tribulus terrestris Ameliorates Oxidative Stress-Induced ARPE-19 Cell Injury through the PI3K/Akt-Nrf2 Signaling Pathway
EE-TT significantly reduced the ROS activity while increasing SOD activity in H2O2-treated ARPE-19 cells. ARPE-19 cells were pretreated with or without 1 mM H2O2 for 24 h, followed by a 24 h exposure to ethanol extracts of Tribulus terrestris (EE-TT): (a) The intracellular ROS activities were measured and analyzed by a flow cytometer. ROS activity of each sample was presented by the mean of fluorescence intensity (MFI) of DCF; (b) The activities of intracellular SOD were measured by a SOD activity assay kit. The SOD levels were normalized against per milligram protein. (c) Comparison of total antioxidant capacity of EE-TT and Trolox (an analogue of vitamin E, a positive antioxidant control). All data are shown as ().,, vs. the samples of control group (nontreated cells); #,##,### vs. H2O2 only treated group.
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