ABSTRACT
OBJECTIVE： To study the improvement effects of Lanqian buccal tablets on scopolamine-induced learning and memory impairment of mice. METHODS： The mice were randomly divided into blank group （normal saline）， model group （normal saline）， positive group （Donepezil hydrochloride tablets， 1.52 mg/kg） and Lanqian buccal tablets high-dose， medium-dose and low-dose groups （800， 400， 200 mg/kg）， with 14 mice in each group. Once a day， 30 days after continuous intragastric administration， except for blank group， other groups were intraperitioneal injected scopolamine hydrobromide 3 mg/kg to induce learning and memory impairment model. After modeling， the learning and memory ability of mice were evaluated with step through test （latency， mistake times of entering darkroom as indexes） and Morris water maze （the time of going up on the platform， the times of crossing the platform， swimming time in target quadrant as indexes）. The levels of Ach， ChAT， AchE， SOD and MDA in cerebral tissue of mice were determined. RESULTS： Compared with blank group， latency， the times of crossing the platform， swimming time in target quadrant， the levels of ChAT， Ach and SOD were shortened or decreased significantly in model group （P＜0.05 or P＜0.01）， while mistake times of entering darkroom， the time of going up on the platform， the levels of AchE and MDA were extended or rised significantly （P＜0.01）. Compared with model group， latency （except for Lanqian buccal tablet low-dose group）， the times of crossing the platform， swimming time in target quadrant， the levels of ChAT， Ach and SOD were extended or rised significantly in positive group and Lanqian buccal tablet groups （P＜0.05 or P＜0.01）. The mistake times of entering darkroom （except for Lanqian buccal tablet low-dose group）， the time of going up on the platform （except for Lanqian buccal tablet low-dose group） and the levels of AchE and MDA （except for Lanqian buccal tablet medium-dose and low-dose group） were shortened or decreased significantly （P＜0.05 or P＜0.01）. CONCLUSIONS： Lanqian buccal tablet can improve scopolamine-induced learning and memory impairment of mice by increasing the levels of ChAT， Ach and SOD and decreasing the levels of AchE and MDA.