Cited by 53Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsTreatment of Major Depression

Synaptic modifications at the CA3–CA1 synapse after chronic AMPA receptor blockade in rat hippocampal slices

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Mateos, José María, Lüthi, Andreas, Savic, Natasa, Stierli, Beat, Streit, Peter, Gähwiler, Beat H., McKinney, R. Anne·2007·The Journal of Physiology

Abstract

Maintenance of dendritic spines, the postsynaptic elements of most glutamatergic synapses in the central nervous system, requires continued activation of AMPA receptors. In organotypic hippocampal slice cultures, chronic blockade of AMPA receptors for 14 days induces a substantial loss of dendritic spines on CA1 pyramidal neurons. Here, using serial section electron microscopy, we show that loss of dendritic spines is paralleled by a significant reduction in synapse density. In contrast, we observed an increased number of asymmetric synapses onto the dendritic shaft, suggesting that spine retraction does not inevitably lead to synapse elimination. Functional analysis of the remaining synapses revealed that hippocampal circuitry compensates for the anatomical loss of synapses by increasing synaptic efficacy. Moreover, we found that the observed morphological and functional changes were associated with altered bidirectional synaptic plasticity. We conclude that continued activation of AMPA receptors is necessary for maintaining structure and function of central glutamatergic synapses.

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Authors
Mateos, J. M., Lüthi, A., Savic, N., Stierli, B., Streit, P., Gähwiler, B. H., & McKinney, R. A.
Affiliations
  • Friedrich Miescher Institute (CH)
  • University of Zurich (CH)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2007-05-04
Volume
581
Issue
1
Pages
129-138
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1601226735
Cited by
53
References
46
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 2 · 2017: 4 · 2016: 3 · 2015: 4 · 2014: 5 · 2013: 4 · 2012: 6
FWCI
1.85
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
AMPA receptor blockade, dendritic spines, CA3-CA1 synapses, hippocampus, synaptic density, synaptic efficacy, bidirectional synaptic plasticity, glutamatergic synapses, synaptic pruning, pyramidal neurons
MeSH terms
Animals, Cells, Cultured, Dendritic Cells, Electrophysiology, Hippocampus, Synaptic Transmission, Neuronal Plasticity, Quinoxalines, Synapses, Receptors, N-Methyl-D-Aspartate, Pyramidal Cells, Receptors, AMPA, Excitatory Amino Acid Antagonists, Excitatory Postsynaptic Potentials, Rats

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