Altered Connectivity in Depression: GABA and Glutamate Neurotransmitter Deficits and Reversal by Novel Treatments
Open accessAbstract
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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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)
Experimental — accuracy not yet measuredFindings 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)
Experimental — accuracy not yet measuredA 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 measuredChronic 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.
Experimental — accuracy not yet measuredDysregulation 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)
Experimental — accuracy not yet measured
Altered connectivity and disruptions in E/I balance contribute to the core pathophysiology of major depressive disorder.
“These findings align with previous reports indicating altered connectivity [13] and disruptions in E/I balance contribute to the core pathophysiology of major depressive disorder [28, 31, 32].”
From A nucleus accumbens-projecting prefrontal cortex circuit underlies chronic social stress-induced depression-like behaviors (2026) · cites this paper as [13]
Approximately one-third of depressed patients fail to remit even after four adequate therapeutic trials.
“Approximately one-third of depressed patients fail to remit, even after four adequate therapeutic trials [3].”
From Pharmacotherapies Targeting GABA-Glutamate Neurotransmission for Treatment-Resistant Depression (2023) · cites this paper as [3]
Multiple SNPs in BDNF-associated regions have been associated with treatment response to ketamine and SSRIs in some patient populations, and BDNF knockout mice show reduced responsiveness to such therapies.
“Moreover, multiple SNPs in BDNF-associated regions have been associated with treatment response to ketamine and selective serotonin reuptake inhibitors (SSRIs) in some patient populations. BDNF knockout mice also show reduced responsiveness to such therapies [3,49].”
From Pharmacotherapies Targeting GABA-Glutamate Neurotransmission for Treatment-Resistant Depression (2023) · cites this paper as [3]
Alterations in BDNF activity may contribute to the acute regional volumetric decreases associated with MDD/TRD.
“It is suggested that alterations in BDNF activity may contribute to the acute regional volumetric decreases associated with MDD/TRD [3].”
From Pharmacotherapies Targeting GABA-Glutamate Neurotransmission for Treatment-Resistant Depression (2023) · cites this paper as [3]
BDNF levels are reduced in postmortem hippocampal and PFC samples of patients with MDD.
“Brain-derived neurotrophic factor (BDNF) levels, a primary driver of neuroplasticity and glutamate modulation, are reduced in postmortem hippocampal and PFC samples of patients with MDD.”
From Pharmacotherapies Targeting GABA-Glutamate Neurotransmission for Treatment-Resistant Depression (2023) · cites this paper as [3]
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Neuroplasticity in cognitive and psychological mechanisms of depression: an integrative model
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“Newer treatments are focusing on restoring the glutamate and GABAergic neurotransmission balance (151).”
BackgroundMolecular pathways of major depressive disorder converge on the synapse
Fries, G. R., Saldana, V. A., Finnstein, J., & Rein, T. (2023) · Molecular Psychiatry · doi:10.1038/s41380-022-01806-1 · Cited by 504 · see citing works
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Self-citationGABA interneurons are the cellular trigger for ketamine's rapid antidepressant actions
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“…of action for alcohol and benzodiazepines, extensively studied in relation to alcohol dependence 35,36 and candidate gene for psychiatric disorders 37,38 ), neuronal growth regulator 1 ( NEGR1 ; associated with intelligence and educational attainment 39,40 ) and paired basic amino acid cleaving…”
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Self-citationNeurosteroids as novel antidepressants and anxiolytics: GABA-A receptors and beyond
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Molecular mechanisms underlying the antidepressant actions of arketamine: beyond the NMDA receptor
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The stressed synapse 2.0: pathophysiological mechanisms in stress-related neuropsychiatric disorders
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Self-citationBDNF signaling during the lifetime of dendritic spines
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Antidepressant actions of ketamine engage cell-specific translation via eIF4E
Aguilar-Valles, A., De Gregorio, D., Matta-Camacho, E., Eslamizade, M. J., Khlaifia, A., Skaleka, A., Lopez-Canul, M., Torres-Berrio, A., Bermudez, S., Rurak, G. M., et al. (2021) · Nature · doi:10.1038/s41586-020-03047-0 · Cited by 144 · see citing works
Molecular Mechanisms of Psilocybin and Implications for the Treatment of Depression
Ling, S., Ceban, F., Lui, L. M. W., Lee, Y., Teopiz, K. M., Rodrigues, N. B., Lipsitz, O., Gill, H., Subramaniapillai, M., Mansur, R. B., et al. (2022) · CNS Drugs · doi:10.1007/s40263-021-00877-y · Cited by 127 · see citing works
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The molecular pathophysiology of depression and the new therapeutics
Tian, H., Hu, Z., Xu, J., & Wang, C. (2022) · MedComm · doi:10.1002/mco2.156 · Cited by 122 · see citing works
Ketamine modulates fronto-striatal circuitry in depressed and healthy individuals
Mkrtchian, A., Evans, J. W., Kraus, C., Yuan, P., Kadriu, B., Nugent, A. C., Roiser, J. P., & Zarate, C. A. (2021) · Molecular Psychiatry · doi:10.1038/s41380-020-00878-1 · Cited by 110 · see citing works
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How does the tea L-theanine buffer stress and anxiety
Wang, L., Brennan, M., Li, S., Zhao, H., Lange, K. W., & Brennan, C. (2022) · Food Science and Human Wellness · doi:10.1016/j.fshw.2021.12.004 · Cited by 80 · see citing works
Glutamatergic Modulators for Major Depression from Theory to Clinical Use
McIntyre, R. S., & Jain, R. (2024) · CNS Drugs · doi:10.1007/s40263-024-01114-y · Cited by 69 · see citing works
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Reduced inhibition in depression impairs stimulus processing in human cortical microcircuits
Yao, H. K., Guet-McCreight, A., Mazza, F., Moradi Chameh, H., Prevot, T. D., Griffiths, J. D., Tripathy, S. J., Valiante, T. A., Sibille, E., & Hay, E. (2022) · Cell Reports · doi:10.1016/j.celrep.2021.110232 · Cited by 55 · see citing works
Neurobiology of the rapid-acting antidepressant effects of ketamine: impact and opportunities
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“BDNF knockout mice also show reduced responsiveness to such therapies [3,49].”
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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)
- PMC
- PMC6450409
- 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
- bronze
- doi.org
- Licence
- 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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