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Erschienen in: Brain Structure and Function 1/2014

01.01.2014 | Original Article

Comparative dynamics of MAPK/ERK signalling components and immediate early genes in the hippocampus and amygdala following contextual fear conditioning and retrieval

verfasst von: Besnard Antoine, Laroche Serge, Caboche Jocelyne

Erschienen in: Brain Structure and Function | Ausgabe 1/2014

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Abstract

Over the past few years multiple studies have attempted to uncover molecular signatures of memory reconsolidation when compared to consolidation. In the present study we used immunocytochemical detection of the MAPK/ERK1/2 pathway, to track activated neuronal circuits in the hippocampus and amygdala recruited during the consolidation and reconsolidation of a contextual fear conditioning (CFC) memory. We report selective differences in magnitude and temporal dynamics of activated ERK1/2 signalling in different subregions of these two structures between the post-training and post-retrieval periods, except in the dentate gyrus, where the patterns of activation were similar. We then focused on this brain area to dissect out the patterns of downstream ERK1/2 signalling components, including the phosphorylation of MSK-1 and histone H3 on ser10, along with the induction of the Immediate Early Genes (IEGs) Arc/Arg3.1, c-Fos and Zif268/Egr1 following CFC training and retrieval. We found that the completion of the nucleosomal response as well as the induction of IEGs shorter during the reconsolidation period as compared to consolidation. Our results shed new light on the cellular mechanisms underlying the consolidation and reconsolidation processes engaged following CFC training and retrieval and further extend the notion that memory reconsolidation is not mechanistically a repetition of consolidation. In addition, we provide evidence that the strength of a previously established CFC memory is characterized by distinct patterns of ERK1/2 activation in different hippocampal and amygdalar subfields upon CFC memory recall. Our results emphasize the differences between consolidation and reconsolidation processes in relation to contextual fear memories.
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Metadaten
Titel
Comparative dynamics of MAPK/ERK signalling components and immediate early genes in the hippocampus and amygdala following contextual fear conditioning and retrieval
verfasst von
Besnard Antoine
Laroche Serge
Caboche Jocelyne
Publikationsdatum
01.01.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Brain Structure and Function / Ausgabe 1/2014
Print ISSN: 1863-2653
Elektronische ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-013-0505-y

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