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This study aims to investigate the neuroprotective effect of the rhizome of  Gastrodia elata  (GE) aqueous extract on beta-amyloid(A  β  )-induced toxicity  in vivo  and  in vitro . Transgenic  Drosophila  mutants with A  β  -induced neurodegeneration in pan-neuron and ommatidia were used to determine the efficacy of GE. The antiapoptotic and antioxidative mechanisms of GE were also studied in A  β  -treated pheochromocytoma (PC12) cells.  In vivo  studies demonstrated that GE (5 mg/g  Drosophila  media)-treated  Drosophila  possessed a longer lifespan, better locomotor function, and less-degenerated ommatidia when compared with the A  β  -expressing control (all  P  < 0.05).  In vitro  studies illustrated that GE increased the cell viability of A  β  -treated PC12 cells in dose-dependent manner, probably through attenuation of A  β  -induced oxidative and apoptotic stress. GE also significantly upregulated the enzymatic activities of catalase, superoxide dismutase, and glutathione peroxidase, leading to the decrease of reactive oxidation species production and apoptotic marker caspase-3 activity. In conclusion, our current data presented the first evidence that the aqueous extract of GE was capable of reducing the A  β  -induced neurodegeneration in  Drosophila , possibly through inhibition of apoptosis and reduction of oxidative stress. GE aqueous extract could be developed as a promising herbal agent for neuroprotection and novel adjuvant therapies for Alzheimer's disease.

The Aqueous Extract of Rhizome ofGastrodia elataProtectedDrosophilaand PC12 Cells against Beta-Amyloid-Induced Neurotoxicity