SOD1 and type 2 diabetes mellitus: In addition, the antioxidant effect of FXC+UCMSCs was further verified in this experiment using cellular assay, and the results showed that FXC+UCMSCs-CM was able to reduce the MDA level and increase the activities of SOD and GSH-Px in the cellular supernatant, which further indicated that the protective effect of FXC+UCMSCs on T2DM was realized through antioxidant effect.