EGCG ameliorating learning and memory impairment in APP/PS1 mice by inhibiting p75 NTR pathway / 中国药理学通报

Aim To investigate whether EGCG treat-ment ameliorates cognitive deficits in APP/PS1 trans-genic mice and, whether it has the ameliorating effect of p75 NTR signaling to neuronal apoptosis in the hippo-campus of APP/PS1 mice. Methods Morris water maze test and locomotivity test were used to predict be-havioral changes; further TUNEL staining and Fluoro-Jade B staining were applied to confirm the neuronal apoptosis and neuronal degeneration;Western blot was employed to detect protein expression levels of p75 NTR signaling in the hippocampus of APP/PS1 mice. Re-sults EGCG treatment dramatically ameliorated the cognitive impairments, and inhibited the neuronal ap-optosis in the APP/PS1 mice. Moreover, EGCG treat-ment dramatically inhibited the p75 NTR signaling by de-creasing the p75ICD expression, JNK2 phosphorylation, and cleaved-caspase 3 expression. Conclusion EGCG treatment dramatically ameliorates the cognitive impairments, and inhibits the neuronal apoptosis by in-hibiting the p75NTR signaling.

Effects of Stilbene-glycoside on Learning and Memory Ability and Neurotrophic Factor of Brain Aging Model Mice Induced by D-galactose / 中国药房

OBJECTIVE:To observe the effect of2,3,5,4'-tetrahydroxy stilbene—2—?—D—glycoside(TSG)on learning and memory ability and neurotrophic factors of dementle model mice induced by D-galactose.METHODS:The mice were randomly divided into normal control,D-galatose model,VitE positive control,TSG low dose(0.033g/kg),TSG medium dose(0.1g/kg),TSG high dose(0.3g/kg)groups.The mice of various therapy groups excluding the normal Control group were in?jected with D-galactose(D-gal)solution s.c.(50mg/kg/day)over a60-day period,while normal control was injected with saline.At the same time,therapy groups were given TSG and positive control VitE(0.08g/kg)a day,and all therapy groups were administered by intragastrically for60days.Then all mice of different groups were tested with Morris water maze test,and five mice of each group were killed and the expression of nerve growth factor(NGF)and neurotrophin-3(NT-3)was determined with immunohistochemistry method.RESULTS:Injection of D-galactose for2months induced the learning and memory dysfunction of mice,and abated NGF and NT-3expression in hippocampal neurons.TSG improved the learning and memory ability of D-gal model mice,promoted NGF and NT-3expression in hippocampal neurons.CONCLUSION:SG can improve memory ability obviously and may prevent and cure dementia disease such as AD.