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Related Experiment Videos

Transporters buffer synaptically released glutamate on a submillisecond time scale

J S Diamond1, C E Jahr

  • 1The Vollum Institute, Oregon Health Sciences University, Portland, Oregon 97201, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 15, 1997
PubMed
Summary
This summary is machine-generated.

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Glutamate transporters in the brain play a crucial role in clearing neurotransmitters from the synaptic cleft. This study reveals that these transporters act as buffers, managing glutamate levels during synaptic events.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Biology

Background:

  • Synaptic transmission relies on precise regulation of neurotransmitter concentrations.
  • Glutamate transporters are key in clearing the excitatory neurotransmitter glutamate from the synaptic cleft.
  • Understanding transporter function is vital for comprehending synaptic signaling and potential neurological disorders.

Purpose of the Study:

  • To investigate the role of glutamate transporters in clearing free glutamate from the synaptic cleft in rat CA1 hippocampal neurons.
  • To quantify the impact of transporters on glutamate dynamics during synaptic events.
  • To elucidate the buffering capacity of transporters in maintaining synaptic homeostasis.

Main Methods:

  • Utilized cultured rat CA1 hippocampal neurons on glial microislands.

Related Experiment Videos

  • Employed the AMPA receptor antagonist kynurenate (KYN) to probe glutamate dynamics.
  • Measured the replacement of KYN by glutamate during synaptic responses.
  • Used D,L-threo-beta-hydroxyaspartic acid (THA) and Li+ to block transporters.
  • Developed a detailed kinetic model of the AMPA receptor to analyze glutamate transients.

    • Main Results:

    • KYN dissociation from AMPA receptors and replacement by glutamate indicated transmitter presence in the cleft.
    • Blocking transporters with THA or Li+ further slowed mEPSC rise time in the presence of KYN.
    • Kinetic modeling demonstrated that transporters significantly influence early glutamate transients (first few hundred microseconds).
    • Transporter blockade effects were replicated by altering simulated glutamate transients, suggesting a buffering role.

    Conclusions:

    • Glutamate transporters significantly impact synaptic glutamate concentrations within the initial phase of a synaptic response.
    • The observed effects suggest that transporters act as buffers, not just clearance mechanisms, for synaptic glutamate.
    • This buffering action is crucial for regulating synaptic transmission and preventing excitotoxicity.