Cited by 100Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsTreatment of Major Depression

Independent Expression of Synaptic and Morphological Plasticity Associated with Long-Term Depression

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Wang, Xiao-bin, Yang, Yunlei, Zhou, Qiang·2007·The Journal of Neuroscience

Abstract

Physiological and morphological alterations occur with long-term synaptic modifications, such as long-term potentiation (LTP) and long-term depression (LTD), but whether these two processes are independent or interactive is unclear. It is also unknown whether or how morphological modifications, like spine remodeling, may contribute to physiological modifications, such as trafficking of glutamate receptors which underlies, at least partially, the expression of LTP and LTD. In this study, we monitored spine size and synaptic responses simultaneously using combined two photon time-lapse imaging with patch-clamp recording in acute hippocampal slices. We show that spine shrinkage and LTD can occur independently of each other. We further show that changes in spine size are unrelated to trafficking of AMPA receptors (AMPARs) under various conditions: constitutive trafficking of AMPARs, insulin-induced internalization of AMPARs, or lateral movement of AMPARs to extrasynaptic sites. Induction of LTD of NMDA receptor-mediated responses (NMDAR-LTD) is associated with spine shrinkage. Nonetheless, NMDAR-LTD and spine shrinkage diverge in the downstream signaling events, and can occur independently of each other. Thus, spine shrinkage is not caused by or required for trafficking of glutamate receptors. In a broader sense, there is a clear dissociation between physiological and morphological expression of LTD. However, inhibition of actin depolymerization blocked the expression of LTD, suggesting that morphologically silent actin remodeling may be involved in the physiological expression of LTD and different subpopulations of actin filaments undergo changes during LTD.

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Crossref · 10.1523/jneurosci.2015-07.2007

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  • The triggering of LTD is associated with the shrinkage of dendritic spines and perhaps even their disappearance.

    “Conversely, the triggering of LTD is associated with the shrinkage of dendritic spines and perhaps even their disappearance (Na ¨gerl et al. 2004;Zhou et al. 2004;Wang et al. 2007;Kasai et al. 2010).”
  • Selective interference with the structural changes that accompany LTD does not affect the increase in synaptic strength, at least not in early stages, up to 1-2 hr following induction.

    “Moreover, selective interference with the structural changes that accompany LTD do not seem to affect the increase in synaptic strength, at least not in early stages, up to 1 -2 hr following induction (Fig. 4) (Wang et al. 2007;Redondo and Morris 2011).”

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Authors
Wang, X.-B., Yang, Y., & Zhou, Q.
Affiliations
Icahn School of Medicine at Mount Sinai (US)
Venue
The Journal of Neuroscience
Published
2007-11-07
Volume
27
Issue
45
Pages
12419-12429
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2054856866
Cited by
100
References
13
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 4 · 2020: 5 · 2019: 2 · 2018: 7 · 2017: 4 · 2016: 8 · 2015: 2 · 2014: 9 · 2013: 3 · 2012: 6
FWCI
4.78
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ellison Medical Foundation
  • Whitehall Foundation
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
long-term depression, synaptic plasticity, dendritic spine morphology, AMPA receptor trafficking, actin cytoskeleton remodeling, hippocampus, patch-clamp recording
MeSH terms
Animals, Animals, Newborn, Gene Expression Regulation, Neuronal Plasticity, Synapses, Rats, Sprague-Dawley, Long-Term Synaptic Depression, Rats

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