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Effect of 5-HT depletion by MDMA on hyperthermia and Arc mRNA induction in rat brain

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Abstract

Rationale

3,4-Methylenedioxymethamphetamine (MDMA) administration to rats produces an acute hyperthermic response and induces localised neuronal activation, which can be visualised via expression of immediate-early genes. The pharmacological and anatomical basis of these effects are unclear. At high doses, MDMA also causes selective neurotoxicity at serotonergic nerve terminals.

Objective

We investigated the effect of 5-hydroxytryptamine (5-HT) depletion on the acute hyperthermic response to MDMA and the pattern of neuronal excitation indicated by Arc (activity-regulated cytoskeleton associated gene) in naive rats and following administration of MDMA at a neurotoxic dose.

Methods

Expression of Arc mRNA was investigated by in situ hybridisation histochemistry using 35S-labelled oligonucleotide probe.

Results

MDMA induced a significant hyperthermia together with increased Arc mRNA expression in cortical regions, caudate-putamen and CA1 hippocampus but not hypothalamus. At 21 days after a neurotoxic dose of MDMA, brain 5-HT and 5-HIAA levels were significantly reduced by 21–32%. In these animals, both the hyperthermic response and the pattern and extent of Arc mRNA expression induced by a subsequent dose of MDMA were unaltered. However, basal Arc expression was significantly increased in cortical regions and CA1 hippocampus.

Conclusion

We conclude that the acute hyperthermic response induced by MDMA is not attenuated by moderate depletion of 5-HT, further questioning mediation via a serotonergic mechanism. Arc mRNA induction by MDMA exhibits highly localised expression, which is not altered following 5-HT depletion. However, following a neurotoxic dose of MDMA, basal expression of Arc is increased, particularly in cortex and CA1, suggesting that mechanisms underlying synaptic plasticity might also be modified.

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Authors and Affiliations

  1. School of Pharmacy, De Montfort University, Leicester , LE1 9BH, UK

    Thomas J. R. Beveridge, Annis O. Mechan, Tyra S. C. Zetterstrom, A. Richard Green & J. Martin Elliott

  2. Department of Pharmacology, University of Oxford, Oxford , OX1 3QT, UK

    Marie Sprakes & Qi Pei

  3. Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157-1083, USA

    Thomas J. R. Beveridge

  4. Department of Neurology, Johns Hopkins University School of Medicine, 5501 Hopkins Bayview Circle, Baltimore, MD 21224, USA

    Annis O. Mechan

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  1. Thomas J. R. Beveridge
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  2. Annis O. Mechan
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  3. Marie Sprakes
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  4. Qi Pei
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  5. Tyra S. C. Zetterstrom
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  7. J. Martin Elliott
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Correspondence to J. Martin Elliott.

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Beveridge, T.J.R., Mechan, A.O., Sprakes, M. et al. Effect of 5-HT depletion by MDMA on hyperthermia and Arc mRNA induction in rat brain. Psychopharmacology 173, 346–352 (2004). https://doi.org/10.1007/s00213-003-1753-y

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  • DOI: https://doi.org/10.1007/s00213-003-1753-y

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