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The MK2 cascade regulates mGluR-dependent synaptic plasticity and reversal learning

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Privitera, Lucia, Hogg, Ellen L., Gaestel, Matthias, Wall, Mark J. and Corrêa, Sônia A. L. (2019) The MK2 cascade regulates mGluR-dependent synaptic plasticity and reversal learning. Neuropharmacology, 155 . pp. 121-130. doi:10.1016/j.neuropharm.2019.05.024 ISSN 0028-3908.

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Official URL: https://doi.org/10.1016/j.neuropharm.2019.05.024

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Abstract

The ability to either erase or update the memories of a previously learned spatial task is an essential process that is required to modify behaviour in a changing environment. Current evidence suggests that the neural representation of such cognitive flexibility involves the balancing of synaptic potentiation (acquisition of memories) with synaptic depression (modulation and updating previously acquired memories). Here we demonstrate that the p38 MAPK/MAPK-activated protein kinase 2 (MK2) cascade is required to maintain the precise tuning of long-term potentiation and long-term depression at CA1 synapses of the hippocampus which is correlated with efficient reversal learning. Using the MK2 knockout (KO) mouse, we show that mGluR-LTD, but not NMDAR-LTD, is markedly impaired in mice aged between 4 and 5 weeks (juvenile) to 7 months (mature adult). Although the amplitude of LTP was the same as in wildtype mice, priming of LTP by the activation of group I metabotropic receptors was impaired in MK2 KO mice. Consistent with unaltered LTP amplitude and compromised mGluR-LTD, MK2 KO mice had intact spatial learning when performing the Barnes maze task, but showed specific deficits in selecting the most efficient combination of search strategies to perform the task reversal. Findings from this study suggest that the mGluR-p38-MK2 cascade is important for cognitive flexibility by regulating LTD amplitude and the priming of LTP.

Item Type: Journal Article
Subjects: Q Science > QK Botany
Q Science > QP Physiology
R Medicine > RC Internal medicine
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Protein kinases , Depression, Mental, Neuroplasticity, Long-term synaptic depression
Journal or Publication Title: Neuropharmacology
Publisher: Elsevier
ISSN: 0028-3908
Official Date: 1 September 2019
Dates:
DateEvent
1 September 2019Published
23 May 2019Available
18 May 2019Accepted
Volume: 155
Page Range: pp. 121-130
DOI: 10.1016/j.neuropharm.2019.05.024
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 22 May 2019
Date of first compliant Open Access: 23 May 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDUniversity of Bradfordhttp://dx.doi.org/10.13039/100010329
200646/Z/16/ZWellcome Trusthttp://dx.doi.org/10.13039/100010269
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