Failures to reconsolidate memory in a mouse model of Alzheimer's disease.

Failures to reconsolidate memory in a mouse model of Alzheimer's disease.
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DOI:
10.1016/j.nlm.2009.05.001
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发表时间:
2009-10
影响因子:
2.7
通讯作者:
Ohno, Masuo
Ohno, Masuo
中科院分区:
心理学4区
文献类型:
--
作者:
Ohno, Masuo

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先前的研究已经证明,在阿尔茨海默病(AD)的动物模型中,空间、背景和痕迹条件记忆的形成受损,这与AD中认知下降的第一个迹象包括难以获得新信息或记忆形成的观察结果一致。越来越多的证据表明,记忆提取是一个动态的过程,在这个过程中,储存的信息再次变得不稳定,需要重新稳定下来。然而,人们对这个被称为记忆再巩固的过程在AD动物模型中是如何受到影响的知之甚少。本研究旨在使用情境恐惧条件反射来比较过表达人类APP和PS1的转基因小鼠中记忆形成和随后的再巩固过程的变化,所述转基因小鼠具有5个家族性AD突变(5XFAD模型)。结果清楚地表明,认知功能障碍开始发生,主要是因为5XFAD小鼠的背景学习或记忆形成水平降低,但随着疾病的进一步发展,由于再巩固不足而导致的额外的检索依赖性逆行性遗忘会加剧认知功能障碍。
Previous studies have demonstrated that the formation of spatial, contextual and trace conditioning memories are impaired in animal models of Alzheimer’s disease (AD), consistent with the observations that the first sign of cognitive decline in AD includes difficulties in the acquisition of new information or memory formation. Evidence is accumulating that memory retrieval is a dynamic process in which stored information becomes labile again and needs to be restabilized. However, it is poorly understood how this process referred to as memory reconsolidation is affected in animal models of AD. The present study was designed to use contextual fear conditioning to compare the changes in memory formation and subsequent reconsolidation processes in transgenic mice that overexpress human APP and PS1 harboring five familial AD mutations (5XFAD model). The results clearly demonstrate that cognitive dysfunction starts to occur primarily as reduced levels of contextual learning or memory formation in 5XFAD mice, but it is exacerbated by additional retrieval-dependent retrograde amnesia due to deficient reconsolidation as disease further develops.
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