Related Experiment Videos
Morphine withdrawal aggression: modification with D1 and D2 receptor agonists
1Department of Psychology, Tufts University, Medford, MA 02155.
Psychopharmacology
|January 1, 1992
Summary
Morphine withdrawal impacts behavior, but dopamine D1 and D2 receptors play distinct roles. D1 receptor stimulation specifically reduces aggression during withdrawal, suggesting independent control of behaviors.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Morphine withdrawal in rodents causes increased aggression and motor disturbances.
- Altered dopaminergic activity is implicated, but the roles of D1 and D2 receptor subtypes are not fully understood.
Purpose of the Study:
- To investigate the differential roles of dopamine D1 and D2 receptors in modulating aggressive and motor behaviors during morphine withdrawal.
Main Methods:
- Male Swiss-Webster mice underwent morphine or placebo pellet implantation followed by withdrawal.
- Dopamine D1 agonist (SKF 38393) and D2 agonist (quinpirole) were administered.
- Aggressive behaviors (resident-intruder test) and motor activities (walking, rearing) were assessed.
Main Results:
- SKF 38393 reduced aggression in both placebo and morphine-withdrawn mice without significantly altering motor activity.
- Quinpirole reduced aggression in both groups but also decreased motor activity, indicating less specificity.
- Pretreatment with SKF 38393 maintained aggression in withdrawn mice while not affecting quinpirole's motor effects.
Conclusions:
- Dopamine D1 and D2 receptors differentially regulate aggressive and motor behaviors during morphine withdrawal.
- D1 receptor stimulation appears particularly important for controlling aggressive behaviors in this context.
- Findings support the hypothesis of independent neural control mechanisms for aggressive and motor behaviors.