To determine the intracellular levels of ROS, DCFH-DA was utilized. AGS cells were plated in 6-well plates and grown to 60% confluence. AGS cells were treated with 3 µM BQ or OQ for 3, 6, 12 or 24 h. Cells were harvested, stained with 10 µM DCFH-DA for 30 min at 37°C, washed twice with PBS, and then immediately analyzed by flow cytometry (Beckman Coulter, Inc.). ROS levels were analyzed using CytExpert software 2.0 (Beckman Coulter, Inc.).
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