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Related Experiment Videos

Dopamine modulates release from corticostriatal terminals.

Nigel S Bamford1, Siobhan Robinson, Richard D Palmiter

  • 1Department of Neurology, University of Washington, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 29, 2004
PubMed
Summary

Dopamine deficiency causes hypersensitive D2 receptors on corticostriatal terminals, affecting neurotransmission. This leads to altered responses to stimulants unless dopamine is replenished with l-dopa.

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Area of Science:

  • Neuroscience
  • Neuropharmacology
  • Cellular Biology

Background:

  • Striatal function relies on dopamine modulation of neurotransmission.
  • Dopamine D2 receptors on corticostriatal terminals regulate excitation.
  • Dopamine depletion impacts striatal circuit activity.

Purpose of the Study:

  • To investigate the effects of dopamine depletion on corticostriatal activity and D2 receptor sensitivity.
  • To determine if dopamine deficiency alters corticostriatal terminal morphology or glutamate density.
  • To assess the functional consequences of dopamine deficiency on striatal neurotransmission.

Main Methods:

  • Utilized FM1-43 dye and multiphoton confocal microscopy in dopamine-deficient (DD) and reserpine-treated mouse models.
  • Assessed corticostriatal terminal kinetics via FM1-43 destaining.

Related Experiment Videos

  • Employed electron microscopy, immunogold labeling, and microdialysis to evaluate morphology, glutamate density, and extracellular glutamate levels.

    • Main Results:

    • Dopamine depletion led to hypersensitive corticostriatal D2 receptors, indicated by enhanced quinpirole-induced depression of FM1-43 destaining at lower doses.
    • DD mice showed no response to amphetamine or cocaine-induced dopamine release without l-dopa pretreatment.
    • Morphological analysis revealed normal corticostriatal terminals and glutamate density, with normal basal extracellular striatal glutamate levels in DD mice.

    Conclusions:

    • Dopamine deficiency results in morphologically intact corticostriatal terminals exhibiting hypersensitive D2 receptors.
    • Altered D2 receptor sensitivity contributes to functional changes in striatal neurotransmission following dopamine depletion.
    • Restoration of dopamine levels with l-dopa can normalize responses to dopaminergic stimulants.