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Related Experiment Videos

Behavioral evidence for midbrain dopamine depolarization inactivation.

P P Rompré1, R A Wise

  • 1Department of Psychology, Concordia University, Montreal, Que., Canada.

Brain Research
|January 16, 1989
PubMed
Summary

High doses of morphine and pimozide (a neuroleptic) caused reward behavior to cease by inactivating dopamine systems. This dopamine system inactivation was reversible, suggesting clinical relevance.

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Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Neurobiology

Background:

  • Morphine and neuroleptics modulate dopamine systems.
  • Dopamine pathways are crucial for reward-based behaviors.
  • Previous research suggests neuroleptics can inhibit dopamine cell activity.

Purpose of the Study:

  • To investigate the effects of high-dose morphine and pimozide on reward behavior.
  • To test the hypothesis that dopamine system inactivation underlies behavioral deficits.
  • To explore the role of ventral tegmental area (VTA) modulation in reversing these deficits.

Main Methods:

  • Administered high doses of ventral tegmental morphine and systemic pimozide to animals.
  • Measured bar-pressing behavior for brainstem stimulation as an indicator of reward.

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  • Utilized electrophysiological recordings to assess dopamine cell firing.
  • Administered ventral tegmental muscimol to observe effects on behavior and dopamine activity.

    • Main Results:

    • High-dose morphine and pimozide completely abolished bar-pressing behavior for reward.
    • Electrophysiological data supported the hypothesis of dopamine system inactivation by both agents.
    • Ventral tegmental muscimol reinstated both dopamine cell firing and the suppressed reward behavior.

    Conclusions:

    • High doses of morphine and pimozide induce behavioral deficits through depolarization inactivation of the dopamine system.
    • This inactivation phenomenon is reversible and confirmed by muscimol's effects.
    • Dopamine system inactivation is behaviorally significant and may have clinical implications.