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Psychopharmacology

, Volume 203, Issue 4, pp 753–762 | Cite as

Running wheel activity is sensitive to acute treatment with selective inhibitors for either serotonin or norepinephrine reuptake

  • Martin Weber
  • Sonja Talmon
  • Ilka Schulze
  • Christine Boeddinghaus
  • Gerhard Gross
  • Hans Schoemaker
  • Karsten M. Wicke
Original Investigation

Abstract

Rationale

Most antidepressants (AD) directly or indirectly enhance the serotonergic tone in the CNS. Since the serotonin system is involved in both, the modulation of mood and motor behavior, it was reasoned that these drugs might also interfere with running wheel activity (RWA), a form of positively motivated motor behavior, which might be linked to pathological states like obsessive–compulsive disorder (OCD).

Objectives

We used RWA to characterize ADs from all major classes. Effects on RWA were compared to effects on general locomotor activity (LOC) to control for unspecific effects on general locomotion.

Methods

Two hours before lights-off, mice were treated with either vehicle or one of the following AD: the selective serotonin reuptake inhibitors (SSRIs) citalopram (3–10 mg/kg), paroxetine (1–10 mg/kg) and fluoxetine (2–6.6 mg/kg), the selective norepinephrine reuptake inhibitor (SNRI) reboxetine (1–10 mg/kg), the monoamine oxidase (MAO) inhibitors tranylcypromine (1–3 mg/kg) and moclobemide (3–10 mg/kg), and the tricyclic ADs desipramine and imipramine (10–30 mg/kg, each). LOC and RWA were measured after lights-off.

Results

At the highest dose tested, all ADs, with the exception of the MAO inhibitors, significantly reduced RWA. Both tricyclics inhibited RWA only at doses that similarly affected LOC. In contrast, all SSRI and reboxetine inhibited RWA at doses that left LOC unaffected.

Conclusions

SSRI and the SNRI reboxetine inhibit RWA at doses not suppressing LOC. RWA may represent a simple behavioral readout of positively motivated behavior that merits further attention for psychopharmacology.

Keywords

Antidepressants SSRI Reboxetine Locomotion Tricyclics MAO inhibitor Running wheel Serotonin OCD 

Abbreviations

AD

antidepressant

LOC

general locomotor activity

MAO

monoamine oxidase

OCD

obsessive–compulsive disorder

RWA

running wheel activity

SNRI

selective norepinephrine reuptake inhibitor

SSRI

selective serotonin reuptake inhibitor

Notes

Acknowledgments

The authors thank Helga Buschbacher and Andrea Egly for help with the experiments, Ulrich Benz, Werner Gabel, and Martin Heinrich for technical support and Anton Bespalov and Marcel van Gaalen for helpful discussion.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Martin Weber
    • 1
    • 2
  • Sonja Talmon
    • 1
    • 3
  • Ilka Schulze
    • 1
    • 4
  • Christine Boeddinghaus
    • 1
    • 5
  • Gerhard Gross
    • 1
  • Hans Schoemaker
    • 1
  • Karsten M. Wicke
    • 1
  1. 1.Neuroscience ResearchLudwigshafenGermany
  2. 2.Department of PsychiatryUCSD School of MedicineLa JollaUSA
  3. 3.Evotec Neurosciences GmbHHamburgGermany
  4. 4.Stiftung Tierärztliche Hochschule HannoverHannoverGermany
  5. 5.LudwigshafenGermany

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