Cited by 267Treatment of Major DepressionNeuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on Behavior

An excitatory synapse hypothesis of depression

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Thompson, Scott M., Kallarackal, Angy J., Kvarta, Mark D., Van Dyke, Adam M., LeGates, Tara A., Cai, Xiang·2015·Trends in Neurosciences

Abstract

Depression is a common cause of mortality and morbidity, but the biological bases of the deficits in emotional and cognitive processing remain incompletely understood. Current antidepressant therapies are effective in only some patients and act slowly. Here, we propose an excitatory synapse hypothesis of depression in which chronic stress and genetic susceptibility cause changes in the strength of subsets of glutamatergic synapses at multiple locations, including the prefrontal cortex (PFC), hippocampus, and nucleus accumbens (NAc), leading to a dysfunction of corticomesolimbic reward circuitry that underlies many of the symptoms of depression. This hypothesis accounts for current depression treatments and suggests an updated framework for the development of better therapeutic compounds.

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Crossref · 10.1016/j.tins.2015.03.003

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  • Stronger excitatory neurotransmission, especially via AMPARs, appears to be a shared requirement for antidepressant efficacy across classical and rapid-acting drugs.

    “It appears that increased strength of excitatory neurotransmission, in particular involving AMPARs, represents a common downstream target that is necessary for antidepressant efficacy among classical and rapid-acting antidepressants (Alt et al., 2006; Gould et al., 2019; Thompson et al., 2015).”

    From Mechanisms of ketamine and its metabolites as antidepressants (2022) · cites this paper as Thompson et al., 2015

    The Formal statement of the excitatory synapse hypothesis (page unavailable) calls restoration of excitatory synaptic strength critical for both conventional antidepressants and ketamine. The Ketamine and NMDAR antagonists section says ketamine loses its antidepressant effect without functional AMPARs. The SSRIs section links their therapeutic effects to potentiated excitation, but does not establish that AMPAR involvement is necessary for classical antidepressants. (LLM, conf=0.86)

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  • The patterns observed in human patients are consistent with the premise that neuronal and molecular plasticity deficits may feed forward to impairments in the coordinated function of prefrontal and limbic regions, resulting in impaired PFC regulation and unchecked stimulus-driven responses to salient negative stimuli.

    “Collectively, these patterns observed in human patients are consistent with the premise that neuronal and molecular plasticity deficits may feed forward to impairments in the coordinated function of prefrontal and limbic regions 66 , resulting in impaired PFC regulation and unchecked stimulus-driven responses to salient negative stimuli.”

    From Neuroplasticity in cognitive and psychological mechanisms of depression: an integrative model (2020) · cites this paper as [66]

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  • Stress-induced structural changes in the PFC contribute to the pathophysiology of neuropsychiatric conditions.

    “Although stress-induced structural changes in the PFC are equally important in their contribution to the pathophysiology of neuropsychiatric conditions [256–262]”

    From Development of prefrontal cortex (2022) · cites this paper as [259]

    The Prefrontal Cortex section reports that chronic stress causes PFC dendritic atrophy and spine loss in animal models, while the Stress and depression section links reduced PFC volume in depressed patients to pathophysiology. The paper supports the claim in the context of depression, but does not establish its broader application to neuropsychiatric conditions generally or that PFC changes are “equally important” relative to other changes. (LLM, conf=0.84)

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  • Conventional antidepressants including selective serotonin reuptake inhibitors, ketamine, and brain stimulation may alleviate depression by acting on excitatory brain systems.

    “Conventional antidepressant therapeutics including selective serotonin reuptake inhibitors (SSRIs) or non-typical therapeutics, including ketamine and brain stimulation, may alleviate depression symptoms by acting on excitatory brain systems (33).”
  • Stress-induced dysfunction in forebrain excitatory transmission led to the excitatory synaptic transmission hypothesis of depression.

    “Stress-induced dysfunction in forebrain excitatory transmission has led to the development of the excitatory synaptic transmission hypothesis of depression (22, 32, 33).”

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Authors
Thompson, S. M., Kallarackal, A. J., Kvarta, M. D., Van Dyke, A. M., LeGates, T. A., & Cai, X.
Affiliations
  • University of Maryland, Baltimore (US)
  • Southern Illinois University Carbondale (US)
Corresponding author
Thompson, Scott M.
Venue
Trends in Neurosciences
Publisher
Elsevier BV
Published
2015-05
Volume
38
Issue
5
Pages
279-294
ISSN
0166-2236 (ISSN-L)
OpenAlex
W2088861514
Cited by
265
References
203
Citations by year
2026: 5 · 2025: 17 · 2024: 23 · 2023: 34 · 2022: 23 · 2021: 33 · 2020: 29 · 2019: 28 · 2018: 20 · 2017: 22 · 2016: 17 · 2015: 14
FWCI
3.05
Type
journal article
Language
en
Open access
Locations
  • Trends in Neurosciences (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (2t32ns063391-21)
  • National Institute of Mental Health (R01MH086828)
  • National Institute of General Medical Sciences (T32GM008181, T32GM092237)
  • National Institute of Neurological Disorders and Stroke (T32NS007375, T32-NS063391)
Topics
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
depression, glutamatergic synapses, chronic stress, genetic susceptibility, prefrontal cortex, hippocampus, nucleus accumbens, antidepressant treatment, synaptic plasticity
MeSH terms
Animals, Antidepressive Agents, Brain, Depression, Humans, Synapses, Excitatory Postsynaptic Potentials

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