RÉSUMÉ
@#Abstract: Objective - To investigate the effect of betulin on the cognition and emotion of rats with chronic aluminum induced Methods dementia and its influence on the expression of inflammatory factors in amygdala. The specific pathogen free female - - SD rats were randomly divided into control group, model group, intervention control group, low dose group and high dose group, with 10 rats in each group. The rats in the later four groups were given with 100 mg/kg body weight and 10.0 g/L aluminum chloride solution by gavage, while the rats in the control group were gavaged with the same volume of distilled water, once a day for 60 days. The rat model of dementia caused by chronic aluminum exposure was established. The rats in the intervention - - control group were given donepezil hydrochloride (0.5 g/L) by gavage, the rats in the low dose and high dose groups were given betulin (20.0 and 60.0 g/L) by gavage, and the rats in the control and model groups were given the same volume of distilled water - by gavage, once a day for four weeks. Anxiety like behavior was evaluated by Y maze new arm test and elevated cross maze test. - The depression like behavior was evaluated by forced swimming test. The amygdala of rats was isolated, and the expression of - - phosphorylated Tau (p Tau) protein andcell derived factor 1 (SDF 1), C X C chemokine receptor (CXCR) 3, CXCR4 and interferon inducible protein 10 (IP 10) was Results detected by Western blotting. In the behavioral experiments, the residence time in the new arm and the percentage of P P time in the open arm of the model group decreased (all <0.05), while the cumulative immobility time increased ( <0.05) compared with the control group. The residence time in the new arm and the percentage of time in the open arm increased in the - - P intervention control group, low dose group and high dose group (all <0.05), while the cumulative immobility time decreased (all P<0.05) compared with the model group. The residence time in the new arm and the percentage of time in the open arm increased - - P P in the low dose group and the high dose group (all <0.05), while the accumulated immobility time decreased (all <0.05) compared with the intervention control group. The residence time in the new arm and the percentage of time in the open arm P P - - increased (all <0.05), while the accumulated immobility time decreased ( <0.05) in the high dose group compared with the low - - - - - dose group. The relative expression of p Tau, βAPP, IL 1, IL 6, IL 8, CXCR3 and IP 10 increased, while the relative expression - P - of SDF 1 and CXCR4 decreased in the model group compared with the control group (all <0.05). The relative expression of p - - - - - Tau, βAPP, IL 1, IL 6, IL 8, IP 10 and CXCR3 decreased, while the relative expression of SDF 1 and CXCR4 increased in the - - P intervention control group, low dose group and high dose group compared with the model group (all <0.05). The relative - - - - - P - expression of p Tau, βAPP, IL 1, IL 6, IL 8, IP 10 and CXCR3 decreased (all <0.05), while the relative expression of SDF 1 - - and CXCR4 increased in the intervention control group, low dose group and high dose group compared with the intervention P Conclusion control group (all <0.05). Betulin can protect cognitive function and improve mood in chronic aluminum - exposure induced dementia model rats. The mechanism may be related to inhibiting the production of inflammatory factors and - chemokines in the amygdala of rats, thereby inhibiting the synthesis of p Tau protein and βAPP protein. βamyloid precursor protein (βAPP) was detected by immunohistochemistry. The