Psychopharmacology

, Volume 215, Issue 2, pp 257–266 | Cite as

Pharmacological characterization of social isolation-induced hyperactivity

  • Katrine Fabricius
  • Lone Helboe
  • Anders Fink-Jensen
  • Gitta Wörtwein
  • Björn Steiniger-Brach
Original Investigation

Abstract

Rationale

Social isolation (SI) of rats directly after weaning is a non-pharmacological, non-lesion animal model based on the neurodevelopmental hypothesis of schizophrenia. The model causes several neurobiological and behavioral alterations consistent with observations in schizophrenia.

Objectives

In the present study, we evaluated if isolated rats display both a pre-pulse inhibition (PPI) deficit and hyperactivity. Furthermore, the sensitivity of SI hyperactivity to antipsychotic was evaluated.

Methods

Rats were socially isolated or group-housed for 12 weeks starting on postnatal day 25. In one batch of animals, the PPI and hyperactivity response were repeatedly compared. Furthermore, we investigated the robustness of the SI-induced hyperactivity by testing close to 50 batches of socially isolated or group-housed rats and tested the sensitivity of the assay to first- and second-generation antipsychotics, haloperidol, olanzapine, and risperidone, as well as the group II selective metabotrobic glutamate receptor agonist (LY404039).

Results

Socially isolated rats showed a minor PPI deficit and a robust increase in hyperactivity compared with controls. Furthermore, SI-induced hyperactivity was selectively reversed by all antipsychotics, as well as the potential new antipsychotic, LY404039.

Conclusion

SI-induced hyperactivity was more pronounced and robust, as compared with SI-induced PPI deficits. Furthermore, SI-induced hyperactivity might be predictive for antipsychotic efficacy, as current treatment was effective in the model. Finally, using LY404039, a compound in development against schizophrenia, we have shown that the hyperactivity assay is sensitive to potential novel mechanisms of action. Thus, SI-induced hyperactivity might be a robust and novel in vivo screening assay of antipsychotic efficacy.

Keywords

Social isolation Hyperactivity Pre-pulse inhibition Antipsychotic Metabotrobic glutamate receptor mGLUR Schizophrenia 

Notes

Acknowledgments

We sincerely thank technician Ditte Bekker-Jensen and senior technician Vibeke Nielsen H. Lundbeck A/S, Department of In Vivo Neuropharmacology, for performing the locomotor activity studies on the repeated tested cohort and performing the PPI study.

Funding

The work presented is part of a PhD work funded by the Neurocluster scholarship at the Faculty of Health and Science, University of Copenhagen, Denmark.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Katrine Fabricius
    • 1
    • 4
  • Lone Helboe
    • 2
  • Anders Fink-Jensen
    • 3
    • 4
  • Gitta Wörtwein
    • 3
    • 4
  • Björn Steiniger-Brach
    • 1
  1. 1.Department of Synaptic Transmission2H. Lundbeck A/S, Synaptic TransmissionValbyDenmark
  2. 2.Department of Neurodegeneration2H. Lundbeck A/S, NeurodegenerationValbyDenmark
  3. 3.Laboratory of Neuropsychiatry, Mental Health Services Copenhagen, The Capital Region of DenmarkUniversity of CopenhagenCopenhagenDenmark
  4. 4.Faculty of Health SciencesCopenhagenDenmark

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