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Impaired spatial working memory but spared spatial reference memory following functional loss of NMDA receptors in the dentate gyrus

B. Niewoehner, F. N. Single, Ø. Hvalby and 6 more

European Journal of Neuroscience · 2007

doi:10.1111/j.1460-9568.2007.05312.x

Abstract

Novel spatially restricted genetic manipulations can be used to assess contributions made by synaptic plasticity to learning and memory, not just selectively within the hippocampus, but even within specific hippocampal subfields. Here we generated genetically modified mice ( NR1 ΔDG mice) exhibiting complete loss of the NR1 subunit of the N ‐methyl‐ d ‐aspartate receptor specifically in the granule cells of the dentate gyrus. There was no evidence of any reduction in NR1 subunit levels in any of the other hippocampal subfields, or elsewhere in the brain. NR1 ΔDG mice displayed severely impaired long‐term potentiation (LTP) in both medial and lateral perforant path inputs to the dentate gyrus, whereas LTP was unchanged in CA3‐to‐CA1 cell synapses in hippocampal slices. Behavioural assessment of NR1 ΔDG mice revealed a spatial working memory impairment on a three‐from‐six radial arm maze task despite normal hippocampus‐dependent spatial reference memory acquisition and performance of the same task. This behavioural phenotype resembles that of NR1 ΔCA3 mice but differs from that of NR1 ΔCA1 mice which do show a spatial reference memory deficit, consistent with the idea of subfield‐specific contributions to hippocampal information processing. Furthermore, this pattern of selective functional loss and sparing is the same as previously observed with the global GluR‐A l ‐α‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazelopropionate receptor subunit knockout, a mutation which blocks the expression of hippocampal LTP. The present results show that dissociations between spatial working memory and spatial reference memory can be induced by disrupting synaptic plasticity specifically and exclusively within the dentate gyrus subfield of the hippocampal formation.

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