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• W2053502537 abstract "Electrolytic lesions to the amygdala, a limbic structure implicated in stress-related behaviors and memory modulation, have been shown to prevent stress-induced impairments of hippocampal long-term potentiation (LTP) and spatial memory in rats. The present study investigated the role of intrinsic amygdalar neurons in mediating stress effects on the hippocampus by microinfusing the GABA A receptor agonist muscimol into the amygdala and examining stress effects on Schaffer collateral/commissural-CA1 LTP and spatial memory. The critical period of the amygdalar contribution to stress effects on hippocampal functions was determined by applying muscimol either before stress or immediately after stress. Our results indicate that intra-amygdalar muscimol infusions before uncontrollable restraint-tailshock stress effectively blocked stress-induced physiological and behavioral effects. Specifically, hippocampal slices prepared from vehicle-infused stressed animals exhibited markedly impaired LTP, whereas slices obtained from muscimol-infused stressed animals demonstrated robust LTP comparable with that of unstressed animals. Correspondingly, vehicle-infused stressed animals displayed impaired spatial memory (on a hidden platform version of the Morris water maze task), whereas muscimol-infused stressed animals revealed unimpaired spatial memory. In contrast to prestress muscimol effects, however, immediate poststress infusions of muscimol into the amygdala failed to interfere with stress impairments of LTP and spatial memory. Together, these results suggest that the amygdalar neuronal activity during stress, but not shortly after stress, is essential for the emergence of stress-induced alterations in hippocampal LTP and memory." @default.
• W2053502537 created "2016-06-24" @default.
• W2053502537 creator A5024183598 @default.
• W2053502537 creator A5032336228 @default.
• W2053502537 creator A5046147056 @default.
• W2053502537 creator A5058421568 @default.
• W2053502537 date "2005-02-09" @default.
• W2053502537 modified "2023-09-27" @default.
• W2053502537 title "Amygdalar Inactivation Blocks Stress-Induced Impairments in Hippocampal Long-Term Potentiation and Spatial Memory" @default.
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• W2053502537 doi "https://doi.org/10.1523/jneurosci.4623-04.2005" @default.
• W2053502537 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6725997" @default.
• W2053502537 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15703407" @default.
• W2053502537 hasPublicationYear "2005" @default.
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