Phytomedicine 2019-Apr
Neuroprotective effects of a Rhodiola crenulata extract on amyloid-β peptides (Aβ1-42) -induced cognitive deficits in rat models of Alzheimer's disease.
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PURPOSE
To assess the protective effects of RCE on cognitive deficits and clarify its therapeutic mechanisms in Aβ1-42 -induced rat models of AD.STUDY DESIGN
RCE was prepared by freeze-drying technology. Their protective effects on Aβ1-42-induced rat models of AD and the preliminary therapeutic mechanisms were studied.RESULTS
RCE significantly increased the spontaneous alternation (F (6, 111) = 8.165, p < 0.001), prolonged the swimming time (F (6, 111) = 20.143, p < 0.001) and decreased the escape latency in rat models of AD. In addition, RCE significantly increased the acetylcholine (Ach) level and the choline acetyl transferase (ChAT) activity (F (6, 34) = 6.033, p < 0.001; F (6, 34) = 6.958, p < 0.001, respectively), repaired the damage of hippocampus neurons and prevented Aβ formation in the hippocampus in Aβ1-42 injected rats. Moreover, RCE increased the superoxide dismutase (SOD) activity and decreased the malondialdehyde (MDA) level in cortex of Aβ1-42 injected rats (F (6, 34) = 5.097, p < 0.01; F (6, 34) = 2.907, p < 0.05, respectively), significantly reduced the expressions of p-tau (ser396) and induced the expressions of p-GSK3β (ser9) in hippocampus (F (6, 34) = 15.297, p < 0.001; F (6, 34) = 9.652, p < 0.001, respectively).CONCLUSION
Our findings demonstrated that RCE significantly alleviated the learning and memory deficits in the Aβ1-42-induced rat models of AD. The mechanisms involved its protection effects against cholinergic system deficiency, oxidative stress damage and GSK3β activation. RCE may be a potential therapeutic medicine with multi-targets to prevent the progression of cognitive deterioration in AD.