Psychopharmacology

, Volume 221, Issue 2, pp 329–339

Age-dependent effects of chronic fluoxetine treatment on the serotonergic system one week following treatment

  • Valentine Bouet
  • Anne Klomp
  • Thomas Freret
  • Marzena Wylezinska-Arridge
  • Jordi Lopez-Tremoleda
  • François Dauphin
  • Michel Boulouard
  • Jan Booij
  • Willy Gsell
  • Liesbeth Reneman
Original Investigation

DOI: 10.1007/s00213-011-2580-1

Cite this article as:
Bouet, V., Klomp, A., Freret, T. et al. Psychopharmacology (2012) 221: 329. doi:10.1007/s00213-011-2580-1

Abstract

Rationale

Selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine are increasingly used for the treatment of depression in children. Limited data are, however, available on their effects on brain development and their efficacy remains debated. Moreover, previous experimental studies are seriously hampered in their clinical relevance.

Objectives

The aim of the present study was to investigate putative age-related effects of a chronic treatment with fluoxetine (5 mg/kg, either orally or i.p. for 3 weeks, 1 week washout) using conventional methods (behavioral testing and binding assay using [123I]β-CIT) and a novel magnetic resonance imaging (MRI) approach.

Methods

Behavior was assessed, as well as serotonin transporter (SERT) availability and function through ex vivo binding assays and in vivo pharmacological MRI (phMRI) with an acute fluoxetine challenge (10 mg/kg oral or 5 mg/kg i.v.) in adolescent and adult rats.

Results

Fluoxetine caused an increase in anxiety-like behavior in treated adult, but not adolescent, rats. On the binding assays, we observed increased SERT densities in most cortical brain regions and hypothalamus in adolescent, but not adult, treated rats. Finally, reductions in brain activation were observed with phMRI following treatment, in both adult and adolescent treated animals.

Conclusion

Collectively, our data indicate that the short-term effects of fluoxetine on the 5-HT system may be age-dependent. These findings could reflect structural and functional rearrangements in the developing brain that do not occur in the matured rat brain. phMRI possibly will be well suited to study this important issue in the pediatric population.

Keywords

Fluoxetine Brain development 5-HT Behavior phMRI 

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Valentine Bouet
    • 1
  • Anne Klomp
    • 2
  • Thomas Freret
    • 1
  • Marzena Wylezinska-Arridge
    • 3
  • Jordi Lopez-Tremoleda
    • 3
  • François Dauphin
    • 1
  • Michel Boulouard
    • 1
  • Jan Booij
    • 4
  • Willy Gsell
    • 3
  • Liesbeth Reneman
    • 2
    • 5
  1. 1.Groupe Mémoire et Plasticité comportementale (GMPc)Université de Caen Basse-NormandieCaenFrance
  2. 2.Radiology DepartmentAcademic Medical Center, Brain Imaging CenterAmsterdamThe Netherlands
  3. 3.Faculty of MedicineBiological Imaging Center, MRC Clinical Sciences Centre, Imperial College of LondonLondonUK
  4. 4.Nuclear Medicine DepartmentAcademic Medical Center, Brain Imaging CenterAmsterdamThe Netherlands
  5. 5.Department of Radiology, G1-241Academic Medical CenterAmsterdamThe Netherlands

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