CAT and diabetic kidney disease: For example, the treatment of diabetic nephropathy with Tripterygium wilfordii polyglycosides may be related to increasing the activity of catalase (CAT) in serum and glutathione peroxidase (GSH-Px) in kidney tissue, reducing the content of malondialdehyde (MDA) in kidney tissue and the level of superoxide anion (O2 -) in serum, inhibiting oxidative stress, and enhancing the ability of antioxidation [86, 87].