咪达唑仑、盐酸戊乙奎醚对小鼠学习记忆的影响

目的观察咪达唑仑、盐酸戊乙奎醚单用、合用对小鼠学习记忆的影响。方法80只昆明(KM)小鼠分层随机区组设计,分为咪达唑仑(1mg.kg-1,midazolan,Mid)组、盐酸戊乙奎醚(0.2mg.kg-1,penehyclidine hydrochloride,Pen)组、咪达唑仑+盐酸戊乙奎醚(1mg.kg-1Mid+0.2mg.kg-1Pen,Mid+Pen)组及生理盐水(10ml.kg-1,NS)组,每组20只;每组再随机分为测试记忆获得组和巩固组,每组10只。采用避暗实验,以训练前/后给药分别评估药物对小鼠记忆获得或巩固的影响。比较各组避暗实验训练后d1、2、3、4、5、6和7测验所得的潜伏期和错误次数。结果①Mid单用或与Pen合用对记忆的获得和巩固均有抑制作用;②Mid合用Pen与Mid单用相比,不加重对记忆获得的抑制,而明显加重对记忆巩固的抑制,且合用比单用抑制记忆时间长。结论Mid和Pen联合使用,对小鼠学习记忆产生明显影响。

Effects of midazolam, penehyclidine hydrochloride on learning and memory of mice

Aim To investigate the effects of midazolam and penehyclidine hydrochloride on learning and memory function of mice.Methods According to stratified random block design,80 KM mice were divided into 4 groups:midazolam 1 mg·kg-1(group M,n=20),penehyclidine hydrochloride 0.2 mg·kg-1(group P,n=20),midazolam 1 mg·kg-1+penehyclidine hydrochloride 0.2 mg·kg-1(group M+P,n=20)and control group(group NS,n=20),and 20 mice in every group were divided randomly into exper-iments of testing memory acquisition(n=10)and memory consolidation(n=10)further.To evaluate the behavioral alteration with these agents,a step-through passive avoidance test was used.Mice were administrated agents before training section for testing memory acquisition,and administrated agents immediately after training section for testing memory consolidation.The step-through latencies and the number of errors on 1,2,3,4,5,6 and 7 day after the training were recorded.Results Midazolam impaired memory acquisition and consolidation when administrated alone or in combination with penehyclidine hydrochloride.Administration of midazolam combinated with penehyclidine hydrochloride did not worsen the effect on memory acquisition,but worsen the effect on memory consolidation obviously.Furthermore,administration of midazolam combinated with penehyclidine hydrochloride impaired memory function persisting longer than that of administration of midazolam alone.Conclusion Administration of midazolam and penehyclidine hydrochloride would result in inhibiting learning and memory function of mice.