Figure 6. Knockdown of GPX4 activates ferroptosis in thyroid cancer cells. Relative iron (A), GSH (B) and MDA (C) contents in FTC133 cells transfected with NC siRNA/siGPX4 after treatment with erastin. (D) Detection of lipid ROS levels in FTC133 cells transfected with NC siRNA/siGPX4 after treatment with erastin; scale bars: 50 μm. *p<0.05, **p<0.01.