Cited by 184Neuroscience and Neuropharmacology ResearchAmino Acid Enzymes and MetabolismNeuroinflammation and Neurodegeneration Mechanisms

Extracellular glutamate: functional compartments operate in different concentration ranges

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Moussawi, Khaled, Riegel, Arthur, Nair, Satish, Kalivas, Peter W.·2011·Frontiers in Systems Neuroscience

Abstract

Extracellular glutamate of glial origin modulates glial and neuronal glutamate release and synaptic plasticity. Estimates of the tonic basal concentration of extracellular glutamate range over three orders of magnitude (0.02-20 μM) depending on the technology employed to make the measurement. Based upon binding constants for glutamate receptors and transporters, this range of concentrations translates into distinct physiological and pathophysiological roles for extracellular glutamate. Here we speculate that the difference in glutamate measurements can be explained if there is patterned membrane surface expression of glutamate release and transporter sites creating extracellular subcompartments that vary in glutamate concentration and are preferentially sampled by different technologies.

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Crossref · 10.3389/fnsys.2011.00094

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  • 50 μM and 1 mM glutamate approximately represent extrasynaptic and active synaptic glutamate levels, respectively.

    “Notably, 50 μM and 1 mM glutamate roughly estimate extrasynaptic and active synaptic glutamate levels, respectively”

    From Mechanisms of ketamine and its metabolites as antidepressants (2022) · cites this paper as Moussawi et al., 2011

    The Abstract says glutamate in the synaptic cleft exceeds 1 mM briefly after action-potential-mediated release, supporting the active-synaptic estimate. But it gives 0.02–30 μM for extracellular glutamate outside the cleft, while the section on in vivo measurements identifies a tonic pool of 1–5 μM; neither supports 50 μM as a rough extrasynaptic level. Page numbers are unavailable in our copy. (LLM, conf=0.91)

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Authors
Moussawi, K., Riegel, A., Nair, S., & Kalivas, P. W.
Affiliations
  • Medical University of South Carolina (US)
  • University of Missouri (US)
Corresponding author
Kalivas, Peter W.
Venue
Frontiers in Systems Neuroscience
Published
2011
Volume
5
Pages
94-94
ISSN
1662-5137 (ISSN-L)
OpenAlex
W2095780210
Cited by
184
References
101
Citations by year
2026: 10 · 2025: 11 · 2024: 6 · 2023: 13 · 2022: 20 · 2021: 16 · 2020: 14 · 2019: 25 · 2018: 15 · 2017: 15 · 2016: 12 · 2015: 11 · 2014: 6 · 2013: 6 · 2012: 4
FWCI
2.12
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Systems Neuroscience (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (DA015369)
  • National Institute on Drug Abuse (R37DA003906, R01DA012513, P50DA015369, R01DA003906, R01DA033342)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
extracellular glutamate, glutamate release, glutamate transporters, glutamate receptors, binding constant, synaptic plasticity, neuron-glia interactions

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