Dissociable effects of monoamine reuptake inhibitors on distinct forms of impulsive behavior in rats

• Published in: Psychopharmacology 2012-01, Vol.219 (2), p.313-326
• Main Authors: Baarendse, Petra J. J., Vanderschuren, Louk J. M. J.
• Format: Article
• Language: English
• Subjects: Adrenergic Uptake Inhibitors - pharmacology; Adrenergic Uptake Inhibitors - therapeutic use; Affective disorders; Amphetamine; Amphetamine - pharmacology; Amphetamine - therapeutic use; Animal behavior; Animals; Animals, Outbred Strains; Antidepressants; Atomoxetine Hydrochloride; Attention deficit hyperactivity disorder; Biomedical and Life Sciences; Biomedicine; Choice Behavior - drug effects; citalopram; Citalopram - pharmacology; Citalopram - therapeutic use; Dopamine; Dopamine Uptake Inhibitors - pharmacology; Dopamine Uptake Inhibitors - therapeutic use; Dose-Response Relationship, Drug; Drug abuse; Drug addiction; Drug delivery; impulsive behavior; Impulsive Behavior - drug therapy; Inhibitor drugs; Intertrial interval; Male; Mental disorders; Mental illness; monoamines; Neurosciences; Neurotransmission; Neurotransmitters; Noradrenaline; Norepinephrine; Original Investigation; Personality; Pharmacology/Toxicology; Piperazines - pharmacology; Piperazines - therapeutic use; Propylamines - pharmacology; Propylamines - therapeutic use; Psychiatry; Psychopharmacology; Rats; Reaction Time - drug effects; Reaction time task; Reinforcement; Response time; Rodents; Serial Learning - drug effects; Serotonin; Serotonin Uptake Inhibitors - pharmacology; Serotonin Uptake Inhibitors - therapeutic use; Time Factors
• ISSN: 0033-3158; 1432-2072
• DOI: 10.1007/s00213-011-2576-x

Rationale High levels of impulsivity are a core symptom of psychiatric disorders such as ADHD, mania, personality disorders and drug addiction. The effectiveness of drugs targeting dopamine (DA), noradrenaline (NA) and/or serotonin (5-HT) in the treatment of impulse control disorders emphasizes the role of monoaminergic neurotransmission in impulsivity. However, impulsive behavior is behaviorally and neurally heterogeneous, and several caveats remain in our understanding of the role of monoamines in impulse control. Objectives This study aims to investigate the role of DA, NA and 5-HT in two main behavioral dimensions of impulsivity. Methods The effects of selective DA (GBR12909; 2.5–10 mg/kg), NA (atomoxetine; 0.3–3.0 mg/kg) and 5-HT (citalopram; 0.3–3.0 mg/kg) reuptake inhibitors as well as amphetamine (0.25–1.0 mg/kg) were evaluated on impulsive action in the five-choice serial reaction time task (5-CSRTT) and impulsive choice in the delayed reward task (DRT). In the 5-CSRTT, neuropharmacological challenges were performed under baseline and long intertrial interval (ITI) conditions to enhance impulsive behavior in the task. Results Amphetamine and GBR12909 increased impulsive action and perseverative responding and decreased accuracy and response latency in the 5-CSRTT. Atomoxetine increased errors of omission and response latency under baseline conditions in the 5-CSRTT. Under a long ITI, atomoxetine also reduced premature and perseverative responding and increased accuracy. Citalopram improved impulse control in the 5-CSRTT. Amphetamine and GBR12909, but not citalopram or atomoxetine, reduced impulsive choice in the DRT. Conclusions Elevation of DA neurotransmission increases impulsive action and reduces impulsive choice. Increasing NA or 5-HT neurotransmission reduces impulsive action.