Neuroprotective effects of phenylethanoid glycosides in an in vitro model of Alzheimer's disease.

The present study aimed to investigate the neuroprotective effects of phenylethanol glycosides (PhGs) on H2O2- and β-amyloid peptide (Aβ)1-42-induced injury of PC12 cells as an in vitro model of Alzheimer's disease (AD). The optimal induction conditions were established through screening of various incubation times and concentrations. PC12 cells were treated with 0.5 µM Aβ1-42 and H2O2 in the presence of PhGs for 24 h and the cell viability was then evaluated by an MTT assay; lactate dehydrogenase (LDH) release and malondialdehyde (MDA) content were also measured. The optimal conditions for establishing the AD model were the treatment of PC12 cells with 0.5 µM Aβ1-42 for 48 h, or with 25 µM H2O2 dissolved in DMEM with PBS. PhGs at concentrations of 5, 25 and 50 µg/ml increased the viability and decreased LDH and MDA release by PC12 cells injured with Aβ1-42 or H2O2. In conclusion, the model of Aβ1-42- and H2O2-induced PC12 cell injury was successfully established. PhGs were shown to have a significant neuroprotective effect against Aβ1-42- or H2O2-induced cell injury.