Role of state-dependency in memory impairment induced by acute administration of midazolam in mice

详细信息	查看全文 | 推荐本文 |

• 作者：Leandro Sanday^a ; ¹ ; Karina A. Zanin^a ; ^b ; ¹ ; Camilla L. Patti^a ; ^b ; Sergio Tufik^b ; Roberto Frussa-Filho^a ; ^b ; ^{frussa.farm@epm.br}
• 关键词：PM-DAT ; plus-maze discriminative avoidance task ; Av and NAv ; aversive and non-aversive enclosed arms ; respectively ; %Tav ; percent time spent in the Av ; %TO ; percent time spent in the open arms
• 刊名：Progress in Neuro-Psychopharmacology and Biological Psychiatry
• 出版年：2012
• 期刊代码：222_02785846
• 类别：med
• 出版时间：27 April, 2012
• 卷：37
• 期：1
• 页码：1-7
• 文件大小：399 K

摘要

Although the memory deficits produced by pre-training benzodiazepines administration have been extensively demonstrated both in humans and in animal studies, there is considerable controversy about the involvement of the state-dependency phenomenon on benzodiazepines-induced anterograde amnesia. The present study aimed to characterize the role of state-dependency on memory deficits induced by the benzodiazepine midazolam (MID) in mice submitted to the plus-maze discriminative avoidance task (PM-DAT). This animal model concomitantly evaluates learning and retention of discriminative avoidance task, exploratory habituation as well as anxiety-like behavior and motor activity. Mice received 2 mg/kg MID before training and/or before testing in the PM-DAT. Pre-training (but not pre-test) MID administration impaired the retention of the discriminative avoidance task, which was not counteracted by a subsequent pre-test administration of this drug, thus refuting the role of state-dependency. Conversely, the pre-training administration of MID also led to an impairment of the habituation of exploration in the PM-DAT (an animal model of non-associative memory). This habituation deficit was state-dependent since it was absent in pre-training plus pre-test MID treated mice. Concomitantly, MID pre-training administration induced anxiolytic effects and diminished the aversive effectiveness of the aversive stimuli of the task, leading to an impairment of the acquisition of the discriminative avoidance task. Our findings suggest that pre-training benzodiazepine administration can impair the retention of different types of memory by producing specific deleterious effects on learning or by inducing state-dependent memory deficits.