Cited by 518Autism Spectrum Disorder ResearchGenetics and Neurodevelopmental DisordersNeuroscience and Neuropharmacology Research

Postmortem brain abnormalities of the glutamate neurotransmitter system in autism

Purcell, A. E., Jeon, O. H., Zimmerman, A. W., Blue, M. E., Pevsner, J.·2001·Neurology

Abstract

BACKGROUND: Studies examining the brains of individuals with autism have identified anatomic and pathologic changes in regions such as the cerebellum and hippocampus. Little, if anything, is known, however, about the molecules that are involved in the pathogenesis of this disorder. OBJECTIVE: To identify genes with abnormal expression levels in the cerebella of subjects with autism. METHOD: Brain samples from a total of 10 individuals with autism and 23 matched controls were collected, mainly from the cerebellum. Two cDNA microarray technologies were used to identify genes that were significantly up- or downregulated in autism. The abnormal mRNA or protein levels of several genes identified by microarray analysis were investigated using PCR with reverse transcription and Western blotting. alpha-Amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid (AMPA)- and NMDA-type glutamate receptor densities were examined with receptor autoradiography in the cerebellum, caudate-putamen, and prefrontal cortex. RESULTS: The mRNA levels of several genes were significantly increased in autism, including excitatory amino acid transporter 1 and glutamate receptor AMPA 1, two members of the glutamate system. Abnormalities in the protein or mRNA levels of several additional molecules in the glutamate system were identified on further analysis, including glutamate receptor binding proteins. AMPA-type glutamate receptor density was decreased in the cerebellum of individuals with autism (p < 0.05). CONCLUSIONS: Subjects with autism may have specific abnormalities in the AMPA-type glutamate receptors and glutamate transporters in the cerebellum. These abnormalities may be directly involved in the pathogenesis of the disorder.

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Crossref · 10.1212/wnl.57.9.1618

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  • Only a limited number of studies have shown altered mRNA expression for glutamate receptors and transporters in brain.

    “However, to date there have been only a limited number of studies showing altered expression of mRNA for glutamate receptors and transporters in brain [154, 155].”
  • Transcriptional studies of ASD post-mortem brains have been limited by paucity of available tissue, making them underpowered to identify reproducible pathways with statistical rigour.

    “More transcriptional studies of ASD post-mortem brains have been limited by the paucity of available tissue, which has made them underpowered to identify reproducible pathways with statistical rigour92–95.”
  • Themes across ASD post-mortem studies include increased expression of immune-microglial genes and decreased expression of synaptic genes in cerebral cortex.

    “Nevertheless, some themes have emerged across studies, including the increased expression of immune-microglial genes and the decreased expression of synaptic genes in the cerebral cortex.”

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Authors
Purcell, A. E., Jeon, O. H., Zimmerman, A. W., Blue, M. E., & Pevsner, J.
Affiliations
Kennedy Krieger Institute (US)
Venue
Neurology
Published
2001-11-13
Volume
57
Issue
9
Pages
1618-1628
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2122550040
Cited by
518
References
39
Citations by year
2026: 13 · 2025: 10 · 2024: 15 · 2023: 28 · 2022: 26 · 2021: 28 · 2020: 26 · 2019: 17 · 2018: 25 · 2017: 19 · 2016: 31 · 2015: 31 · 2014: 26 · 2013: 24 · 2012: 35
FWCI
4.89
Type
journal article
Language
en
Open access
closed
Locations
  • Neurology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (MH.NS 31862)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (N01-HD-8-3284, HD24061, P30HD024061)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
autism spectrum disorder, AMPA receptors, NMDA receptor, cerebellum, GLAST, aberrant gene expression, glutamate transporters, receptor density, caudate-putamen, prefrontal cortex, postmortem brain
MeSH terms
Adult, Autistic Disorder, Autoradiography, Brain Chemistry, Cerebellum, Child, Child, Preschool, Female, Humans, Male, Synaptic Transmission, RNA, Messenger, Gene Expression, Receptors, N-Methyl-D-Aspartate, Receptors, AMPA, Glutamic Acid, Oligonucleotide Array Sequence Analysis, Excitatory Amino Acid Transporter 1, Excitatory Amino Acid Transporter 2

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