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SPATIAL LEARNING WITHOUT NMDA RECEPTOR-DEPENDENT LONG-TERM POTENTIATION

机译:没有NMDA受体长期依赖的空间学习

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摘要

HIPPOCAMPAL lesions impair spatial learning in the watermaze(1). Drugs that antagonize N-methyl-D-aspartate (NMDA)-receptor activity, which is required for long-term potentiation (LTP) at various hippocampal synapses(2-4), block LTP and impair watermaze learning(4-6). This has led to the hypothesis that NMDA receptors, through their involvement in LTP, may be necessary for spatial(4-11) and other forms of learning(12,13). We examined this hypothesis using NPC17742 (2R,4R,5S-2-amino-4,5-(1,2-cyclohexyl)-7-phosphonoheptano acid), a potent and specific antagonist of NMDA receptors(14-17). Here we report that NPC17742 completely blocked dentate gyrus LTP but did not prevent normal spatial learning in rats that had been made familiar with the general task requirements by non-spatial pretraining. Although these results do not rule out a contribution of NMDA-mediated dentate LTP to spatial learning, they indicate that this form of LTP is not required for normal spatial learning in the watermaze. [References: 28]
机译:HIPPOCAMPAL病变损害了水迷宫中的空间学习(1)。拮抗N-甲基-D-天冬氨酸(NMDA)受体活性的药物是各种海马突触的长期增强(LTP)所需的药物(2-4),会阻断LTP并损害水迷宫学习(4-6)。这导致了这样一个假设,即NMDA受体通过参与LTP,可能对于空间(4-11)和其他形式的学习(12,13)是必需的。我们使用NPC17742(2R,4R,5S-2-氨基-4,5-(1,2-环己基)-7-膦基庚酸)(NMDA受体的一种有效且特异性的拮抗剂)检验了这一假设(14-17)。在这里,我们报道NPC17742完全阻断了齿状回LTP,但是并没有阻止已经通过非空间预训练熟悉一般任务要求的大鼠的正常空间学习。尽管这些结果并不排除NMDA介导的齿状LTP对空间学习的贡献,但它们表明这种形式的LTP对于水迷宫中的正常空间学习而言不是必需的。 [参考:28]

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