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Effects of ambient temperature on the relative reinforcing strength of MDMA using a choice procedure in monkeys

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Abstract

Rationale

3,4-Methylenedioxymethamphetamine (MDMA, ecstasy) is frequently used in hot environments, such as rave parties. Studies in laboratory animals have shown that ambient temperature can alter the behavioral and neurochemical effects of MDMA.

Objective

To examine the influence of ambient temperature on the relative reinforcing strength of MDMA and reinstatement of behavior previously maintained by MDMA is the objective of the study.

Methods

The effects of cool (18°C), room (24°C), and warm (31°C) temperatures were examined when MDMA was available under a concurrent fixed-ratio 30 schedule of MDMA (saline, 0.03–0.3 mg/kg/injection) and food choice in rhesus monkeys (n = 5). During saline substitutions, the effect of noncontingent MDMA (0.03–0.3 mg/kg) on response allocation was examined at each ambient temperature.

Results

At room temperature, MDMA choice increased as a function of dose, such that food was preferred over a low MDMA dose (0.03 mg/kg/injection), whereas higher doses were preferred over food. Elevating the ambient temperature significantly increased the relative reinforcing strength of 0.03 mg/kg/injection MDMA, and lowering the ambient temperature significantly attenuated the choice of 0.1 mg/kg/injection MDMA. Noncontingent injections of MDMA administered before a session in which saline was the alternative to food dose-dependently increased injection-lever responding; this effect was not influenced by ambient temperature.

Conclusions

These results suggest that ambient temperature can affect the relative reinforcing strength of MDMA, but not MDMA-induced reinstatement. Furthermore, these results suggest environmental strategies for decreasing the reinforcing strength of MDMA.

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Acknowledgements

We appreciate the insightful comments and statistical assistance of Linda Porrino and Beth Reboussin. This research was supported by the National Institute on Drug Abuse grants DA-06634 (MAN) and DA-020281 (MLB).

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Author notes

  1. Matthew L. Banks

    Present address: Division of Neuroscience, Yerkes National Primate Research Center, Emory University, Atlanta, GA, 30329, USA

Authors and Affiliations

  1. Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, USA

    Matthew L. Banks, Paul W. Czoty & Michael A. Nader

  2. Department of Pharmaceutical and Biomedical Sciences, Raabe College of Pharmacy, Ohio Northern University, Ada, OH, 45810, USA

    Jon E. Sprague

  3. Department of Radiology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, USA

    Michael A. Nader

Authors
  1. Matthew L. Banks
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  2. Jon E. Sprague
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  3. Paul W. Czoty
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  4. Michael A. Nader
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Correspondence to Michael A. Nader.

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Banks, M.L., Sprague, J.E., Czoty, P.W. et al. Effects of ambient temperature on the relative reinforcing strength of MDMA using a choice procedure in monkeys. Psychopharmacology 196, 63–70 (2008). https://doi.org/10.1007/s00213-007-0932-7

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  • DOI: https://doi.org/10.1007/s00213-007-0932-7

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