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Related Experiment Videos

Cannabinoids decrease corticostriatal synaptic transmission via an effect on glutamate uptake.

Timothy M Brown1, Jonathan M Brotchie, Stephen M Fitzjohn

  • 1School of Biological Sciences, University of Manchester, Manchester, M13 9PT, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 6, 2003
PubMed
Summary
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Cannabinoid CB1 receptor activation in the brain’s striatum reduces glutamate release and uptake. This mechanism impacts motor control by modulating synaptic transmission via metabotropic glutamate receptors.

Area of Science:

  • Neuroscience
  • Neuropharmacology

Background:

  • Cannabinoid CB1 receptors modulate motor control via the basal ganglia.
  • CB1 receptor activation is known to reduce glutamatergic synaptic transmission.

Purpose of the Study:

  • To investigate the role of CB1 receptors in regulating glutamate release and uptake in the rat striatum.
  • To elucidate the mechanism by which CB1 receptor activation affects corticostriatal synaptic transmission.

Main Methods:

  • Utilized rat striatal slices to measure [3H]glutamate release and uptake.
  • Examined the effects of CB1 receptor activation and glutamate uptake inhibition on corticostriatal synaptic transmission.
  • Investigated the involvement of metabotropic glutamate receptors (mGluRs) in these processes.

Related Experiment Videos

Main Results:

  • CB1 receptor activation significantly reduced both glutamate release and uptake in striatal slices.
  • Inhibition of glutamate uptake mimicked the effects of CB1 receptor activation on synaptic transmission.
  • Both CB1 receptor activation and glutamate uptake inhibition mutually occluded each other's effects, indicating a shared pathway.
  • The observed synaptic depression was dependent on the activation of metabotropic glutamate receptors.

Conclusions:

  • CB1 receptor activation in the striatum decreases glutamate transporter activity.
  • This decrease leads to increased synaptic cleft glutamate, activating presynaptic mGluRs.
  • Presynaptic mGluR activation subsequently reduces glutamate release, thereby modulating corticostriatal synaptic transmission and motor control.