NMDA processes mediate anterograde amnesia of contextual fear conditioning induced by hippocampal damage: immunization against amnesia by context preexposure.

NMDA processes mediate anterograde amnesia of contextual fear conditioning induced by hippocampal damage: immunization against amnesia by context preexposure.
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NMDA 过程介导海马损伤引起的情境恐惧调节的顺行性遗忘:通过情境预暴露对遗忘进行免疫。

DOI:
10.1037//0735-7044.108.1.19
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发表时间:
1994
影响因子:
1.9
通讯作者:
Fanselow,MS
Fanselow,MS
中科院分区:
医学4区
文献类型:
--
作者:
Young,SL;Bohenek,DL;Fanselow,MS

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大鼠海马损伤产生情境恐惧条件反射的逆行性和顺行性健忘症。本实验考察了情境条件反射的顺行性缺陷。在术后7天、14天或28天进行训练时,海马电解损伤产生的缺陷很明显,证实了健忘症的持久性。海马在情境条件反射中的作用可能与NMDA (n -甲基- d -天冬氨酸)受体介导的过程有关。NMDA海马损伤和海马内给予NMDA拮抗剂均产生顺行性遗忘。在海马体损伤前28天预先暴露于条件反射环境的动物免受损伤通常产生的缺陷。因此,海马体必须在预暴露期间形成上下文表征,随后存储在其他地方。一旦形成,这种情境表征就可以与无条件刺激联系起来。
Hippocampal lesions in rats produce both a retrograde and an anterograde amnesia of contextual fear conditioning. The present experiments examined the anterograde deficit in context conditioning. The deficit produced by electrolytic hippocampal lesions was apparent when training occurred on 7, 14, or 28 days following surgery, confirming the durability of the amnesia. The role of the hippocampus in context conditioning may be related to an NMDA (N-methyl-D-aspartate) receptor-mediated process. Both NMDA hippocampal lesions and intrahippocampal administration of an NMDA antagonist produced anterograde amnesia. Animals preexposed to the conditioning context 28 days prior to hippocampal lesioning were protected from the deficit normally produced by the lesions. Thus, the hippocampus must form a contextual representation during preexposure that is subsequently stored elsewhere. Once formed this representation of the context can be associated with an unconditional stimulus.
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