Figure 4

CeO2 NP suppress intracellular ROS production induced by UVA radiation. HSFs were treated, washed, and stained as mentioned in the Materials and Methods section. ROS levels in HSF cells were measured by a flow cytometer (A) and an inverted fluorescence microscope (B) labelled with DCFH-DA for 30 min at 37 °C. Scale bar = 10 µm.