The effect of acute or chronic administration of escitalopram on behavior of chronic-stressed mice / 中华行为医学与脑科学杂志

ABSTRACT

Objective To investigate the effect of acute or chronic administration of eseitalopram(ESC)on behavior of mice,which suffered from chronic unpredictable mild stress(CUMS).Methods Mice were exposured to CUMS for 8 weeks,then the behavior of mice were investigated every 2 weeks,and the effect of acute and chronic administration of escitalopram on behavior was compared.Results (1)The body weight of all stressed mice were lighter than control group(18.5±1.1)g from 2nd to 8th week(P＜0.01).After chronic administration of escitalopram,the body weight of cms+Cesc group(18.5±0.6)g were increased relative to other stressed groups(P＜0.01).(2)In open-field test for 15min,the total distance and central distance of stressed groups were further,and numbers of rear were more than control group(P＜0.05)from 2nd to 4th week,but then these indexes were decreased from 6th to 8th week(P＜0.05).After chronic administration,the total distance(57.4±11.0)m,central distance(12.0±3.0)m and numbers of rear(74.2±6.1)of cms+Cesc group increased(P＜0.05).(3)In sucrose preference test,the preference percentage of stressed groups was less than control group(P＜0.05)from 6th to 8th week at 8th week,the preference percentage of cms + Cesc group((79.0±2.7)%)was more than other stressed groups(P＜0.05).(4)In forced swimming test,compared with control group,immobility time of stressed groups became longer from 4th to 8th week..After chronic administration,immobility time of cms + Cesc group((124.7±8.00)s)was shorter than other stressed groups.(5)After acute administration,the behavior of cms + Aesc group was not different relative to pure stressed group(P＞0.05).Conclusion Chronic administration of escitalopram show up efficacy on depression behavior of CUMS mice,but acute administration is ineffective.