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Psychopharmacology

, Volume 225, Issue 3, pp 531–542 | Cite as

Chronic cannabinoid exposure reduces phencyclidine-induced schizophrenia-like positive symptoms in adult rats

  • Maria Sabrina Spano
  • Liana Fattore
  • Francesca Cadeddu
  • Walter Fratta
  • Paola Fadda
Original Investigation

Abstract

Rationale

Chronic cannabis use can induce psychotic states that resemble schizophrenia. Yet, schizophrenic patients often smoke cannabis as a form of self-medication to counter the aversive symptoms of schizophrenia. We recently demonstrated an ameliorating effect of cannabinoid self-administration (SA) on negative and cognitive schizophrenia-like symptoms induced experimentally by the non-competitive N-methyl-d-aspartate receptor antagonist phencyclidine (PCP). Whether cannabinoid SA alleviates or exacerbates schizophrenia-like positive symptoms is still unclear.

Objectives

This follow-up study aimed to evaluate the effect of self-administered cannabinoid on PCP-induced schizotypic positive symptoms in adult rats.

Methods

Male rats were trained to self-administer either the cannabinoid CB1 receptor agonist WIN 55,212-2 (WIN; 12.5 μg/kg/infusion) or its vehicle (Veh) intravenously. The effects of acute and chronic intermittent intraperitoneal administration of PCP (2.5 mg/kg) on motor parameters were then tested in Veh-SA and WIN-SA.

Results

Cannabinoid SA significantly attenuated the psychotomimetic effects of PCP exposure observed in control rats. Following acute PCP administration, WIN-SA animals displayed more frequent rearing and lower anxiety-like profile than Veh-SA rats. WIN-SA rats also exhibited lower behavioural sensitisation to chronic PCP treatment as demonstrated by reduced hyperlocomotion in response to an acute PCP challenge. In addition, parallel experiments performed in experimenter-administered rats that received WIN at comparable SA doses confirmed the ameliorating effects of cannabinoid exposure on PCP-induced schizotypic behaviours, indicating that motivational effects were not responsible for the ameliorative effects of cannabinoids.

Conclusions

Our results indicate that cannabis may exert protective effects on positive schizotypic symptoms in adult animals such as hypermotility and anxiety state.

Keywords

Cannabinoids PCP Schizophrenia Self-administration Psychosis Locomotor activity Anxiety Comorbidity Abuse 

Notes

Acknowledgments

This study was supported by funds (PRIN 2005) from the Italian Ministry of University and Scientific Research (MIUR). The authors are grateful to Dr. Barbara Tuveri for animal care and technical assistance.

Conflict of interest

None.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Maria Sabrina Spano
    • 1
  • Liana Fattore
    • 1
    • 2
  • Francesca Cadeddu
    • 3
  • Walter Fratta
    • 2
    • 3
  • Paola Fadda
    • 2
    • 3
  1. 1.CNR Neuroscience InstituteNational Research CouncilMonserrato (Cagliari)Italy
  2. 2.Centre of Excellence “Neurobiology of Dependence”University of CagliariMonserrato (Cagliari)Italy
  3. 3.Division of Neuroscience and Clinical Pharmacology, Department of Biomedical SciencesUniversity of Cagliari (Cittadella Universitaria of Monserrato)Monserrato (Cagliari)Italy

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