Cited by 1,026Treatment of Major DepressionNeuroscience and Neuropharmacology ResearchStress Responses and Cortisol

Altered Connectivity in Depression: GABA and Glutamate Neurotransmitter Deficits and Reversal by Novel Treatments

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Duman, Ronald S., Sanacora, Gerard, Krystal, John H.·2019·Neuron

Abstract

The mechanisms underlying the pathophysiology and treatment of depression and stress-related disorders remain unclear, but studies in depressed patients and rodent models are beginning to yield promising insights. These studies demonstrate that depression and chronic stress exposure cause atrophy of neurons in cortical and limbic brain regions implicated in depression, and brain imaging studies demonstrate altered connectivity and network function in the brains of depressed patients. Studies of the neurobiological basis of the these alterations have focused on both the principle, excitatory glutamate neurons, as well as inhibitory GABA interneurons. They demonstrate structural, functional, and neurochemical deficits in both major neuronal types that could lead to degradation of signal integrity in cortical and hippocampal regions. The molecular mechanisms underlying these changes have not been identified but are thought to be related to stress induced excitotoxic effects in combination with elevated adrenal glucocorticoids and inflammatory cytokines as well as other environmental factors. Transcriptomic studies are beginning to demonstrate important sex differences and, together with genomic studies, are starting to reveal mechanistic domains of overlap and uniqueness with regards to risk and pathophysiological mechanisms with schizophrenia and bipolar disorder. These studies also implicate GABA and glutamate dysfunction as well as immunologic mechanisms. While current antidepressants have significant time lag and efficacy limitations, new rapid-acting agents that target the glutamate and GABA systems address these issues and offer superior therapeutic interventions for this widespread and debilitating disorder.

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Crossref · 10.1016/j.neuron.2019.03.013

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  • Repeated stress decreases BDNF expression in limbic and cortical brain regions, notably the hippocampus and PFC.

    “Repeated stress decreases the expression of BDNF in limbic and cortical brain regions, notably the hippocampus and PFC 4,5,22 .”

    From Neuroplasticity in cognitive and psychological mechanisms of depression: an integrative model (2020) · cites this paper as [22]

    The “GABA alterations in MDD and stress” section says stress reduces BDNF and reports that chronic stress lowers certain BDNF mRNA isoforms, in context of findings about the PFC. The “Stress and neurotrophic factors” section reports lower BDNF in the hippocampus and PFC of people with depression, but does not establish that repeated stress caused the hippocampal decrease. Page numbers are unavailable in our copy. (LLM, conf=0.84)

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  • Findings in mood disorders reveal alterations at the levels of intracellular signaling, gene expression, neurotrophic factors, neurogenesis, neuroinflammation, excitatory and inhibitory neurotransmission, and synaptic number and function in several brain regions implicated in depression.

    “These findings reveal alterations at the levels of intracellular signaling, gene expression, neurotrophic factors, neurogenesis, neuroinflammation, excitatory and inhibitory neurotransmission, and synaptic number and function, and have been described in several brain regions implicated in depression 13-22 .”

    From Neuroplasticity in cognitive and psychological mechanisms of depression: an integrative model (2020) · cites this paper as [22]

    The sections on stress and neurotrophic factors, genetics, and glutamate alterations describe changes in signaling, gene expression, BDNF, excitatory and inhibitory neurotransmission, and synapses in depression-related brain regions (pages unavailable). The copy does not establish altered neurogenesis, and its discussion of neuroinflammation is limited to a genetic association and proposed inflammatory mechanisms rather than a demonstrated alteration. (LLM, conf=0.86)

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  • A single dose of ketamine increases BDNF release and stimulates mTORC1 signaling, leading to increased levels of synaptic proteins (GluR1, PSD95, synapsin 1) and increased number and function of synapses in the PFC.

    “A single dose of ketamine increases BDNF release and stimulates mTORC1 signaling, which leads to increased levels of synaptic proteins (i.e., GluR1, PSD95, and synapsin 1) and increased number and function of synapses in the PFC 4,22,35 .”

    From Neuroplasticity in cognitive and psychological mechanisms of depression: an integrative model (2020) · cites this paper as [22]

    The “Novel antidepressants treatments that influence glutamate” section (page unavailable) says ketamine-induced synapse formation depends on BDNF release and mTORC1 signaling, and that a single dose increases synaptic protein levels and the number and function of mPFC synapses. It names GluA1, but does not name PSD95 or synapsin 1 among the proteins increased; the synapse findings described are from rodent studies. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Chronic stress disrupts key neurotransmitter systems, alters neuronal connectivity, and disturbs synaptic network activity, leading to dysregulated excitatory glutamatergic signaling, impaired dopaminergic transmission, and altered inhibitory GABAergic signaling in specific brain regions.

    “Concurrently, chronic stress disrupts key neurotransmitter systems, alters neuronal connectivity, and disturbs synaptic network activity, leading to, for example, dysregulated excitatory glutamatergic signaling, impaired dopaminergic transmission, and altered inhibitory GABAergic signaling in specific brain regions [4,24,29,35,36,37].”

    From Comparative Analysis of HPA-Axis Dysregulation and Dynamic Molecular Mechanisms in Acute Versus Chronic Social Defeat Stress (2025) · cites this paper as [37]

    Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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  • Dysregulation of mPFC activity, particularly within L5 projection neurons, is implicated in the pathophysiology of depression through clinical imaging and preclinical models.

    “Dysregulation of mPFC activity—particularly within layer 5 (L5) projection neurons—has been implicated in the pathophysiology of depression through both clinical imaging studies and preclinical models [12–14].”

    From A nucleus accumbens-projecting prefrontal cortex circuit underlies chronic social stress-induced depression-like behaviors (2026) · cites this paper as [13]

    The paper’s ‘Structural and functional connectivity alterations in depression’ section reports abnormal PFC connectivity in clinical imaging studies. Its ‘Glutamate alterations in MDD and stress’ section reports that chronic stress reduces dendritic branching in mPFC layer V pyramidal neurons. These passages support the broad link, but the imaging findings do not establish activity changes specifically in L5 projection neurons, and the layer V preclinical finding concerns neuronal structure rather than measured activity. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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Authors
Duman, R. S., Sanacora, G., & Krystal, J. H.
Affiliations
Yale University (US)
Corresponding author
Duman, Ronald S.
Venue
Neuron
Publisher
Elsevier BV
Published
2019-04
Volume
102
Issue
1
Pages
75-90
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2933289315
Cited by
1,026
References
175
Citations by year
2026: 137 · 2025: 173 · 2024: 175 · 2023: 146 · 2022: 153 · 2021: 130 · 2020: 93 · 2019: 19
FWCI
12.72
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIMH (MH045481, MH093897)
  • NIAAA Center for the Translational Neuroscience of Alcohol (P50AA12870)
  • CT Department of Mental Health and Addiction Services
  • Yale-New Haven Health
  • Yale Center for Clinical Investigation (UL1 RR024139)
  • U.S. Department of Veterans Affairs
Topics
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
depression, chronic stress, GABAergic interneurons, glutamatergic neurons, neural network connectivity, excitotoxicity, glucocorticoids, inflammatory cytokines, sex differences, rapid-acting antidepressants, hippocampus, cortical atrophy, schizophrenia, bipolar disorder, immune mechanisms
MeSH terms
Animals, Antidepressive Agents, Brain, Cerebral Cortex, Depressive Disorder, gamma-Aminobutyric Acid, Hippocampus, Humans, Interneurons, Ketamine, Synaptic Transmission, Neurons, Sex Factors, Glutamic Acid

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