Erzhi Pills Ameliorate Cognitive Dysfunction and Alter Proteomic Hippocampus Profiles Induced by D-galactose and Aβ Injection in Ovariectomized Alzheimer's Disease Model Rats
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Context: Erzhi pills are a classic Chinese medicine prescription, but their effects on Alzheimer's disease (AD) are not clear.
Objective: The protective effects of Erzhi pills in AD rats and their potential mechanisms were investigated.
Materials And Methods: An AD rat model was established by ovariectomy combined with d-galactose and Aβ injection. Rats were randomly divided into five groups: sham-operated, model, oestradiol valerate (0.80 mg/kg), Erzhi pills high-dose (1.50 g/kg), and Erzhi pills low-dose (0.75 g/kg). Learning and memory abilities were evaluated with the Morris water maze test, oestrogen levels with an ELISA kit, and hippocampal neuron morphology and Nissl bodies in the cytoplasm with H&E and Nissl staining. The expression of ERβ, Aβ, and p-tau was determined by immunohistochemistry. Nano LC-LTQ-Orbitrap Proteomics determined potential targets and related signalling pathways. Western blotting was used to detect the expression of the related proteins.
Results: Erzhi pills (1.5, 0.75 g/kg) markedly reduced escape latencies on the MWM, increased numbers of platform crossings, numbers of neurons, Nissl bodies, oestrogen levels (100.18, 43.04 pg/mL), and ERβ-positive cells (57.42, 39.83); Aβ (18.85, 36.83)- and p-tau (14.42, 29.71)-positive cells were significantly decreased. Proteomics identified more than 100 differentially expressed proteins involved in 48 signalling pathways, five of which are involved in the PI3K/Akt signalling pathway. Western blotting showed decreased expression of GSK3β and Bad, while Akt, PI3K, 14-3-3, Bcl-xl, and Bcl-2 were upregulated.
Discussion And Conclusion: Erzhi pills may serve as a potential agent for AD therapeutics by improving learning and memory.
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