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Related Experiment Videos

Indirect dopamine agonists effects on despair test: dissociation from hyperactivity

J M Vaugeois1, D Pouhé, F Zuccaro

  • 1Unité de Neuropsychopharmacologie Expérimentale, URA CNRS 1969, Institut Fédératif de Recherches Multidisciplinaires sur les Peptides, Faculté de Médecine et Pharmacie de Rouen, Saint-Etienne du Rouvray, France.

Pharmacology, Biochemistry, and Behavior
|May 1, 1996
PubMed
Summary
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Both dexamphetamine and GBR 12783 increase mouse activity. Dopamine D2 receptors, not D1, mediate antidepressant-like effects in the behavioral despair test, independent of locomotion.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Dopamine plays a crucial role in regulating motor activity and mood.
  • Understanding the specific dopamine receptor subtypes involved in antidepressant effects is essential for developing targeted therapies.

Purpose of the Study:

  • To investigate the roles of dopamine D1 and D2 receptors in the antidepressant-like effects of indirect dopamine agonists.
  • To determine if the locomotor-stimulating effects are necessary for the anti-immobility effects.

Main Methods:

  • Mice were treated with dexamphetamine or GBR 12783 (a dopamine reuptake inhibitor).
  • Locomotor activity and behavioral despair (forced swimming test) were assessed.
  • The effects of dopamine D1 (SCH 23390) and D2 (haloperidol) receptor antagonists were evaluated.

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Main Results:

  • Both dexamphetamine and GBR 12783 increased locomotion and reduced immobility in the behavioral despair test.
  • Dopamine D1 receptor antagonist SCH 23390 blocked the locomotor effects but not the anti-immobility effects.
  • Dopamine D2 receptor antagonist haloperidol blocked both locomotor and anti-immobility effects of dexamphetamine, but only anti-immobility effects of GBR 12783.

Conclusions:

  • Indirect dopamine agonists exert antidepressant-like effects in the behavioral despair test independently of locomotor stimulation.
  • These effects are mediated by the stimulation of dopamine D2 receptors, not D1 receptors.