Cited by 286Schizophrenia research and treatmentNeuroscience and Neuropharmacology ResearchAmino Acid Enzymes and Metabolism

The glutamate hypothesis of schizophrenia: evidence from human brain tissue studies

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Hu, Wei, MacDonald, Matthew L., Elswick, Daniel E., Sweet, Robert A.·2015·Annals of the New York Academy of Sciences

Abstract

A number of studies have indicated that antagonists of the N ‐methyl‐ d ‐aspartate subtypes of glutamate receptors can cause schizophrenia‐like symptoms in healthy individuals and exacerbate symptoms in individuals with schizophrenia. These findings have led to the glutamate hypothesis of schizophrenia. Here we review the evidence for this hypothesis in postmortem studies of brain tissue from individuals affected by schizophrenia, summarizing studies of glutamate neuron morphology, of expression of glutamate receptors and transporters, and of the synthesizing and metabolizing enzymes for glutamate and its co‐agonists. We found consistent evidence of morphological alterations of dendrites of glutamatergic neurons in the cerebral cortex of subjects with schizophrenia and of reduced levels of the axon bouton marker synaptophysin. There were no consistent alterations of mRNA expression of glutamate receptors, although there has been limited study of the corresponding proteins. Studies of the glutamate metabolic pathway have been limited, although there is some evidence that excitatory amino acid transporter‐2, glutamine synthetase, and glutaminase have altered expression in schizophrenia. Future studies would benefit from additional direct examination of glutamatergic proteins. Further advances, such as selective testing of synaptic microdomains, cortical layers, and neuronal subtypes, may also be required to elucidate the nature of glutamate signaling impairments in schizophrenia.

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  • De novo mutations are enriched in the 244 genes with case-control P<0.01, with limited or no signal in remaining genes.

    “Using Poisson rate tests based on expected mutation rate27, we found these de novo mutations are enriched for the 244 genes with P < 0.01 in our case-control analysis (Figure S13, Table S5), with limited or no signal in the remaining genes in the genome (Figure 1D).”

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Authors
Hu, W., MacDonald, M. L., Elswick, D. E., & Sweet, R. A.
Affiliations
  • West Virginia University (US)
  • University of Pittsburgh (US)
Corresponding author
Sweet, Robert A.
Venue
Annals of the New York Academy of Sciences
Publisher
Wiley
Published
2014-10-14
Volume
1338
Issue
1
Pages
38-57
ISSN
  • 0077-8923 (ISSN-L)
  • 1749-6632
OpenAlex
W1924382915
Cited by
286
References
184
Citations by year
2026: 18 · 2025: 22 · 2024: 42 · 2023: 21 · 2022: 31 · 2021: 23 · 2020: 24 · 2019: 21 · 2018: 19 · 2017: 33 · 2016: 16 · 2015: 15 · 2012: 1
FWCI
2.94
Type
journal article
Language
en
Open access
Locations
  • Annals of the New York Academy of Sciences (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (MH071533, MH103204, MH16804)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
NMDA receptor antagonists, glutamatergic neurons, dendritic morphology, synaptophysin, glutamate receptors, GLT-1, glutamine synthetase, glutaminase, glutamate metabolism, cerebral cortex, postmortem brain, synaptic dysfunction
MeSH terms
Brain, Female, Humans, Male, RNA, Messenger, Schizophrenia, Receptors, Glutamate, Glutamic Acid

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