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Increased anxiety and "depressive" symptoms months after MDMA ("ecstasy") in rats: drug-induced hyperthermia does not predict long-term outcomes

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Abstract

Rationale

There is some uncertainty whether the acute hyperthermia caused by MDMA (ecstasy) plays a significant role in determining the long-term neurotoxic effects on brain 5-HT systems and associated changes in mood and behaviour.

Objective

The present study assessed whether long-term behavioural and cognitive changes seen in MDMA-treated rats are affected by hyperthermia at the time of drug administration.

Method

Male Wistar rats were treated with MDMA (4×5 mg/kg i.p. over 4 h on 2 consecutive days) or vehicle at either a high ambient temperature (28°C) or a low ambient temperature (16°C). Eight to 18 weeks later, rats were tested in behavioural measures of anxiety (social interaction and emergence tests), a test of cognition (object recognition test) and the forced swim test of depression. At the conclusion of behavioural testing the rats were killed and their brains analysed using HPLC.

Results

MDMA treatment caused a clear and consistent hyperthermia at 28°C and hypothermia at 16°C. Months later, rats pre-treated with MDMA at either 16 or 28°C displayed increased anxiety in the social interaction and emergence tests and reduced escape attempts and increased immobility in the forced swim test. MDMA pre-treatment was also associated with poorer memory on the object recognition test, but only in rats given the drug at 28°C. Rats pre-treated with MDMA showed loss of 5-HT in the hippocampus, striatum, amygdala and cortex, regardless of body temperature at the time of dosing. However, 5-HIAA loss in the amygdala and hippocampus was greater in rats pre-treated at 28°C. Dopamine in the striatum was also depleted in rats given MDMA.

Conclusions

These results indicate that hyperthermia at the time of dosing with MDMA is not necessary to produce subsequent 5-HT depletion and anxiety in rats. They also extend previous findings of long-term effects of brief exposure to MDMA in rats to include apparent "depressive" symptoms in the forced swim model.

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Acknowledgements

This work was supported by an NH&MRC grant to Iain S. McGregor and Glenn E. Hunt. We are grateful to Geoffrey van der Plasse for technical assistance and to Darek Figa and Debbie Brookes for animal care.

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Authors and Affiliations

  1. School of Psychology, University of Sydney, Sydney, 2006 NSW, Australia

    Iain S. McGregor, Clint G. Gurtman, Kirsten C. Morley, Kelly J. Clemens & Jennifer L. Cornish

  2. Department of Psychology, University of Maastricht, Maastricht, The Netherlands

    Arjan Blokland

  3. Department of Pharmacology, University of Sydney, Sydney, 2006 NSW, Australia

    Kong M. Li

  4. Department of Psychological Medicine, University of Sydney, Concord Hospital, Sydney, 2139 NSW, Australia

    Glenn E. Hunt

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  1. Iain S. McGregor
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  2. Clint G. Gurtman
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  3. Kirsten C. Morley
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  4. Kelly J. Clemens
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  5. Arjan Blokland
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  7. Jennifer L. Cornish
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  8. Glenn E. Hunt
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Correspondence to Iain S. McGregor.

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McGregor, I.S., Gurtman, C.G., Morley, K.C. et al. Increased anxiety and "depressive" symptoms months after MDMA ("ecstasy") in rats: drug-induced hyperthermia does not predict long-term outcomes. Psychopharmacology 168, 465–474 (2003). https://doi.org/10.1007/s00213-003-1452-8

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  • DOI: https://doi.org/10.1007/s00213-003-1452-8

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