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Psychopharmacology

, Volume 213, Issue 2–3, pp 465–473 | Cite as

The anxiolytic-like effects of cannabidiol injected into the bed nucleus of the stria terminalis are mediated by 5-HT1A receptors

  • Felipe V. Gomes
  • Leonardo B. M. Resstel
  • Francisco S. Guimarães
Original Investigation

Abstract

Rationale

Cannabidiol (CBD) is a non-psychotomimetic compound from Cannabis sativa that induces anxiolytic-like effects in rodents and humans after systemic administration. Previous results from our group showed that CBD injection into the bed nucleus of the stria terminalis (BNST) attenuates conditioned aversive responses. The aim of this study was to further investigate the role of this region on the anxiolytic effects of the CBD. Moreover, considering that CBD can activate 5-HT1A receptors, we also verified a possible involvement of these receptors in those effects.

Methods

Male Wistar rats received injections of CBD (15, 30, or 60 nmol) into the BNST and were exposed to the elevated plus-maze (EPM) or to the Vogel conflict test (VCT), two widely used animal models of anxiety.

Results

CBD increased open arms exploration in the EPM as well as the number of punished licks in the VCT, suggesting an anxiolytic-like effect. The drug did not change the number of entries into the enclosed arms of the EPM nor interfered with water consumption or nociceptive threshold, discarding potential confounding factors in the two tests. Moreover, pretreatment with the 5-HT1A receptor antagonist WAY100635 (0.37 nmol) blocked the effects of CBD in both models.

Conclusions

These results give further support to the proposal that BNST is involved in the anxiolytic-like effects of CBD observed after systemic administration, probably by facilitating local 5-HT1A receptor-mediated neurotransmission.

Keywords

Cannabinoids Anxiety Serotonin receptor Rat Maze Limbic system Behavior Anxiolytic Animal model 

Notes

Acknowledgements

The authors thank THC Pharm for having kindly donated CBD; Ivanilda A.C. Fortunato and J.C. de Aguiar for technical support. FV Gomes has a CNPq MsC fellowship (130171/2009-3). This research was also supported by grants from FAPESP (2009/03187-9 and 2007/03685-3), CNPq (480550/2007-7 and 305996/2008-8), and FAEPA.

Conflicts of interest

The authors declare no conflicts of interest.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Felipe V. Gomes
    • 1
  • Leonardo B. M. Resstel
    • 1
  • Francisco S. Guimarães
    • 1
  1. 1.Department of Pharmacology, School of MedicineUniversity of São PauloRibeirão PretoBrazil

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