Cited by 173Neuroscience and Neuropharmacology ResearchTreatment of Major DepressionStress Responses and Cortisol

Overcoming the effects of stress on synaptic plasticity in the intact hippocampus: rapid actions of serotonergic and antidepressant agents

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Shakesby, Alison C., Anwyl, Roger, Rowan, Michael J.·2002·The Journal of Neuroscience

Abstract

Acute inescapable stress dramatically affects the inducibility of plasticity at glutamatergic synapses in the intact hippocampus. The present study examined the involvement of serotonergic mechanisms in mediating and modulating the block of long-term potentiation (LTP) in the CA1 area of anesthetized rats after exposure to an elevated platform stress. Fluoxetine and fenfluramine, agents that raise hippocampal extracellular 5-HT concentration, blocked the induction of LTP in nonstressed animals, thus mimicking the effect of stress. In contrast, (+/-)-tianeptine, a drug that decreases 5-HT levels, had no effect on LTP induction in nonstressed animals. Remarkably, (+/-) administration of tianeptine after the stress rapidly overcame the block of LTP induction without affecting baseline excitatory transmission. Consistent with a reduction of 5-HT levels being responsible for this effect of tianeptine, the (-) enantiomer, which is associated with the 5-HT uptake enhancing action of (+/-)-tianeptine, also caused a recovery of the induction of LTP in previously stressed animals, whereas the relatively inactive (+) enantiomer had no effect. Furthermore, fluoxetine prevented the effect of tianeptine in stressed animals. These findings show that antidepressants have rapid and powerful interactions with the mechanisms controlling the persistence of the block of LTP by inescapable stress.

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Crossref · 10.1523/jneurosci.22-09-03638.2002

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  • Dysfunction of synaptic plasticity with neuronal atrophy and cell death contributes to the pathophysiology of depression.

    “While synaptic plasticity is a well-known key mechanism in learning and memory (Dayan and Cohen, 2011;Kandel, 2001), unequivocal studies suggest that dysfunction of synaptic plasticity with neuronal atrophy and cell death contribute to the pathophysiology of depression and therapeutic response could be associated with overcoming this deficit (Duman and Aghajanian, 2012;Krystal et al., 2013;Shakesb”

    From Serotonin and neuroplasticity – Links between molecular, functional and structural pathophysiology in depression (2017) · cites this paper as Shakesby et al., 2002

    The LTP induction in stressed animals section reports that tianeptine restored hippocampal synaptic plasticity impaired by stress in rats. The Discussion connects hippocampal dysfunction to aspects of affective disorders and mentions stress-related dendritic atrophy, but it does not establish neuronal cell death or show that these changes cause depression. Page numbers were not available for these passages. (LLM, conf=0.84)

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Research works printed but not linked: 1

  1. [71]71. Wilde M, Penfield P (1995) Tianeptine. A review of its pharmacody- namic and pharmacokinetic properties, and therapeutic efficacy in depression and coexisting anxiety and depression. Drugs 49:411-439.

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Authors
Shakesby, A. C., Anwyl, R., & Rowan, M. J.
Affiliations
Trinity College Dublin (IE)
Venue
The Journal of Neuroscience
Published
2002-05-01
Volume
22
Issue
9
Pages
3638-3644
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2126689937
Cited by
173
References
75
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 3 · 2020: 1 · 2019: 1 · 2018: 6 · 2017: 8 · 2016: 3 · 2015: 13 · 2014: 10 · 2013: 8 · 2012: 4
FWCI
4.30
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • Health Research Board
  • Enterprise Ireland
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
stress, synaptic plasticity, long-term potentiation, hippocampus, CA1, serotonin, tianeptine, fluoxetine, fenfluramine, antidepressants, inescapable stress, glutamatergic synapses, enantiomers
MeSH terms
Animals, Antidepressive Agents, Corticosterone, Drug Antagonism, Electrodes, Implanted, Exercise Test, Fenfluramine, Fluoxetine, Hippocampus, Male, Neuronal Plasticity, Serotonin, Stress, Physiological, Synapses, Thiazepines, Rats, Wistar, Selective Serotonin Reuptake Inhibitors, Long-Term Potentiation, Serotonin Agents, Excitatory Postsynaptic Potentials, Rats

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