Figure 4From: Effects of Coptis extract combined with chemotherapeutic agents on ROS production, multidrug resistance, and cell growth in A549 human lung cancer cellsEffects of COP and BER on MDR in A549 cells. Cells were treated with COP-L (1.6 μg/mL), COP-H (6.4 μg/mL), BER-L (0.5 μg/mL), or BER-H (4 μg/mL) for 24 h and harvested for dye retention determination. * P < 0.05 compared to control. Values are means ± SD of 4 independent assays.Back to article page