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Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...

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Extracellular glutamate: functional compartments operate in different concentration ranges.

Khaled Moussawi1, Arthur Riegel, Satish Nair

  • 1Department of Neurosciences, Medical University of South Carolina Charleston, SC, USA.

Frontiers in Systems Neuroscience
|January 26, 2012
PubMed
Summary

Glial glutamate release influences brain cell communication and synaptic plasticity. Differences in measured extracellular glutamate concentrations may arise from patterned membrane expression creating distinct microenvironments, impacting physiological roles.

Keywords:
cystine–glutamate exchangegliaglutamateglutamate uptakemGluRsynapse

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Extracellular glutamate, originating from glial cells, plays a crucial role in modulating both glial and neuronal glutamate release.
  • This extracellular glutamate significantly impacts synaptic plasticity, a key mechanism for learning and memory.
  • Current estimates for basal extracellular glutamate concentrations vary widely (0.02-20 μM) depending on measurement technology.

Purpose of the Study:

  • To explore the reasons behind the wide discrepancies in measured extracellular glutamate concentrations.
  • To propose a model explaining how different measurement technologies might yield varying results.
  • To link these concentration differences to distinct physiological and pathophysiological roles of extracellular glutamate.

Main Methods:

  • Review of existing literature on extracellular glutamate measurement techniques.
  • Analysis of binding constants for glutamate receptors and transporters.
  • Hypothetical modeling of patterned membrane surface expression of glutamate release and transporter sites.

Main Results:

  • The wide range of reported extracellular glutamate concentrations suggests variability in measurement approaches.
  • Binding affinities of receptors and transporters indicate that different glutamate levels elicit distinct cellular responses.
  • A proposed model suggests that patterned expression creates localized extracellular subcompartments with unique glutamate concentrations.

Conclusions:

  • Discrepancies in extracellular glutamate measurements can be attributed to the spatial organization of release and transport mechanisms.
  • These localized variations in glutamate concentration within extracellular subcompartments are likely preferentially sampled by different technologies.
  • Understanding these microenvironmental differences is critical for accurately assessing the physiological and pathophysiological significance of extracellular glutamate.