Establishment of the mimetic aging effect in mice caused by D-galactose.

We successfully established an oxidant damage of mimetic aging model using mice induced by D-galactose, and the mimetic aging model is relative to free radical and the accumulation of waste substances in metabolism. The animals were divided into 3 groups: (1) phosphate-buffered saline (PBS); (2) 1% D-galactose; (3) 5% D-galactose by subcutaneous injection every day. After 45 days, mice treated with D-galactose showed a significant increase in the malondialdehyde (MDA), total antioxidant status (TAS) and a decrease in superoxide dismutase (SOD) in the blood compared with the PBS group. In the brain, the D-galactose treated mice exhibited a higher level MDA and a lower level SOD activity. In the liver, only the 5% D-galactose group indicated a significant increase in MDA. By reference to the oxidative biomarkers in blood, brain and liver, we have confirmed the reliability of the mimetic aging model.