Postsynaptic density protein 95(PSD-95) ,the most abundant and significant synapse scaffolding protein at excitatory synapses ,is a hallmark of synaptic function. Proteins palmitoylation is one of the important post-translational modifications ,which is occurred more frequently in the nervous system than in other organs. Palmitoylation-dependent regulation of PSD-95 has become a research hotspot in the fields of neuroplasticity and neuropsychiatric diseases.

Objective:To investigate the effects of cattle encephalon glycoside and ignotin(CEGI)on the expression of glial fibrillary acidic protein(GFAP)and neuronal nuclear antigen(NeuN)in the brain of APP/PS1 model mice of Alzheimer's disease.Methods:A total of 36 5-month-old APP/PS1 dual-transgenic model mice were randomly divided into 3 groups: the model group(normal saline 6.6 ml·kg -1·d -1), CEGI group(CEGI 6.6 ml·kg -1·d -1)and donepezil group(donepezil 2 mg·kg -1·d -1), with 12 in each group.Twelve C57BL/6J mice of the same age were used as the normal control group.All mice were given drugs for 6 weeks consecutively.Brain tissue was collected for immunohistochemical staining to detect the expression of amyloid β-protein(Aβ), GFAP and NeuN, which were then analyzed quantitatively. Results:The results of immunohistochemical staining indicated that levels of Aβ and GFAP were higher and levels of NeuN were lower in the model group than in the normal control group(0.147±0.068% vs.0%, 61.750±22.020 vs.26.000±4.598, 0.021±0.002 vs.0.032±0.003, P<0.05). Levels of Aβ and GFAP were lower and levels of NeuN were higher in the CEGI group and the donepezil group than in the model group(0.058±0.055 % vs.0.057±0.045 %, 38.250±5.418 vs.36.130±5.963, 0.029±0.004 vs.0.027±0.003, P<0.05). There was no significant difference in the expression of Aβ, GFAP and NeuN between the CEGI group and the donepezil group( P>0.05). Conclusions:CEGI has multi-target neuroprotective effects via down-regulating the expression of Aβ and GFAP and up-regulating the expression of NeuN.