[Protective effects of paeoniflorin against aBETA25-35-induced oxidative stress in PC12 cells]

To investigate the neuroprotective effects and mechanism of paeoniflorin on Abeta25-35-induced oxidative stress in PC12 cells.

The proliferation of induced PC12 cells were investigated by the MTT method. The leakage rate of lactate dehydrogenase (LDH), the intracellular content of malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were also measured. The changes of the intracellular reactive oxygen species (ROS) level and the mitochondrial membrane potential (MMP) were investigated by flow cytometry using DCFH-DA and Rh123 staining. The protein expression of HO-1, Cyt C and cleaved Caspase-3 was detected by Western blot.

The results showed that paeoniflorin at different doses (5, 10, 20 micromol . L-1) could increase the cell viability and activities of antioxidant enzyme (GSH-Px, SOD and HO-1), prevent LDH release and lipid peroxidation (MDA) production, decrease the level of intracellular ROS, increase MMP, inhibit the release of cytochrome c from the mitochondria and attenuate activation of Caspase-3.

Paeoniflorin can protect PC12 cells from Abeta25-35 oxidative stress injuries. The mechanism may be related to its antioxidant action and inhibition of mitochondria-mediated caspase signaling pathways.