Effects of Lignans from Schisandra chinensis Rattan Stems against Aβ-Induced Memory Impairment in Rats and Neurotoxicity in Primary Neuronal Cells.

Oxidative stress, which is caused by Amyloid-β deposition in brain, plays an important role in Alzheimer's disease. In this study, we found that lignans from rattan stems (rsSCH-L) could reduce the escape latency and the distance travelled by the Aβ injected rats while the crossing platform time was enhanced in the Morris water maze test. Further research demonstrated that lignans from rsSCH-L attenuated Aβ-induced neuronal cell injury by increasing the content of SOD and GSH-Px and decreasing the levels of LDH, ROS, and MDA. Moreover, rsSCH-L also inhibited the apoptosis of primary neuronal cells. The mechanisms of the apoptosis were related with the downregulation of caspase-3, caspase-8, Bax, and upregulation of Bcl-2. Taken together, the results show that rsSCH-L can improve cognitive ability in vivo. Meanwhile rsSCH-L exhibit a neuroprotective environment against oxidative stress and apoptosis in vitro. Therefore, rsSCH-L may be a potential therapeutic agent for this neurodegenerative disease.