Cited by 84Treatment of Major DepressionTryptophan and brain disordersNeuroscience and Neuropharmacology Research

Role of glutamate receptors and glial cells in the pathophysiology of treatment-resistant depression

Kim, Yong-Ku, Na, Kyoung-Sae·2016·Progress in Neuro-Psychopharmacology and Biological Psychiatry

Abstract

Treatment-resistant depression (TRD) causes substantial socioeconomic burden. Although a consensus on the definition of TRD has not yet been reached, it is certain that classic monoaminergic antidepressants are ineffective for TRD. One decade ago, many researchers found ketamine, an N-methyl-d-aspartate receptor (NMDAR) antagonist, to be an alternative to classic monoaminergic antidepressants. The major mechanisms of action of ketamine rapidly induce synaptogenesis in the brain-derived neurotrophic factor (BDNF) pathway. Although excessive glutamatergic neurotransmission and consequent excitotoxicity were considered a major cause of TRD, recent evidence suggests that the extrasynaptic glutamatergic receptor signal pathway mainly contributes to the detrimental effects of TRD. Glial cells such as microglia and astrocytes, early life adversity, and glucocorticoid receptor dysfunction participate in complex cross-talk. An appropriate reuptake of glutamate at the astrocyte is crucial for preventing 'spill-over' of synaptic glutamate and binding to the extrasynaptic NMDA receptor. Excessive microglial activation and the inflammatory process cause astrocyte glutamatergic dysfunction, which in turn activates microglial function. Early life adversity and glucocorticoid receptor dysfunction result in vulnerability to stress in adulthood. A maladaptive response to stress leads to increased glutamatergic release and pro-inflammatory cytokines, which then activate microglia. However, since the role of inflammatory mediators such as pro-inflammatory cytokines is not specific for depression, more disease-specific mechanisms should be identified. Last, although much research has focused on ketamine as an alternative antidepressant for TRD, its long-lasting effectiveness and adverse events have not been rigorously demonstrated. Additionally, evidence suggests that substantial brain abnormalities develop in ketamine abusers. Thus, more investigations for ketamine and other novel glutamatergic agents are needed.

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Crossref · 10.1016/j.pnpbp.2016.03.009

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Authors
Kim, Y.-K., & Na, K.-S.
Affiliations
  • Korea University Ansan Hospital (KR)
  • Gachon University Gil Medical Center (KR)
Corresponding author
Na, Kyoung-Sae
Venue
Progress in Neuro-Psychopharmacology and Biological Psychiatry
Publisher
Elsevier BV
Published
2016-10
Volume
70
Pages
117-126
ISSN
0278-5846 (ISSN-L)
OpenAlex
W2332640807
Cited by
84
References
167
Citations by year
2026: 7 · 2025: 10 · 2024: 13 · 2023: 7 · 2022: 6 · 2021: 2 · 2020: 9 · 2019: 9 · 2018: 15 · 2017: 4 · 2016: 2
FWCI
1.14
Type
journal article
Language
en
Open access
closed
Locations
  • Progress in Neuro-Psychopharmacology and Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
treatment-resistant depression, glutamate receptors, extrasynaptic NMDA receptors, microglia, astrocytes, brain-derived neurotrophic factor, ketamine, glutamatergic neurotransmission, excitotoxicity, childhood adversity, inflammatory cytokines, neuroinflammation, stress response, glutamate uptake, antidepressant mechanism
MeSH terms
Animals, Humans, Neuroglia, Receptors, Glutamate, Depressive Disorder, Treatment-Resistant

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