Small Changes in Ambient Temperature Cause Large Changes in 3,4-Methylenedioxymethamphetamine (MDMA)-Induced Serotonin Neurotoxicity and Core Body Temperature in the Rat
Jessica E. Malberg, Lewis S. Seiden
Journal of Neuroscience July 1, 1998 DOI: 10.1523/jneurosci.18-13-05086.1998 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Experimental study Peer reviewed |
|---|---|
| Population | Rats |
| Intervention | MDMA |
| Dose | 20 or 40 mg/kg |
| Duration | 2 weeks after MDMA treatment |
| Topics | MDMA Serotonin |
| Keywords | Neurotoxicity Core optical fiber Core temperature Pharmacology Anesthesia Composite material Biochemistry |
| Citations | 344 |
| Key findings | Ambient temperatures of 26–30°C produced hyperthermia and neurotoxicity in MDMA-treated rats, while temperatures of 20–24°C caused hypothermia and no neurotoxicity. |
Abstract
The amphetamine derivative 3,4-methylenedioxymethamphetamine (MDMA) is a drug of abuse and has been shown to be neurotoxic to 5-HT terminals in many species. MDMA-engendered neurotoxicity has been shown to be affected by both ambient temperature and core body temperature. We now report that small (2°C) changes in ambient temperature produce changes in core temperature in MDMA-treated rats, but the same changes in ambient temperature do not affect core temperature of saline-treated animals. Furthermore, increases in core temperature of MDMA-treated animals increase neurotoxicity. Rats were given MDMA (20 or 40 mg/kg) or saline and placed in an ambient temperature of 20, 22, 24, 26, 28, or 30°C using a novel temperature measurement apparatus that controls ambient temperature ±0.5°C. Two weeks after MDMA treatment, the rats were killed, and regional 5-HT and 5-hydroxyindole acetic acid levels were analyzed as a measure of neurotoxicity. Rats treated with MDMA at 20 and 22°C showed a hypothermic core temperature response. Treatment with MDMA at 28 and 30°C produced a hyperthermic response. At ambient temperatures of 20–24°C, neurotoxicity was not observed in the frontal cortex, somatosensory cortex, hippocampus, or striatum. At ambient temperatures of 26–30°C, neurotoxicity was seen and correlated with core temperature in all regions examined. These data indicate that ambient temperature has a significant affect on MDMA neurotoxicity, core temperature, and thermoregulation in rats. This finding has implications on both the temperature dependence of the mechanism of MDMA neurotoxicity and human use because fatal hyperthermia is associated with MDMA use in humans.
Comparable studies
Other preclinical and animal studies on MDMA, most cited first.
Citations in the library
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- Human psychopharmacology of Ecstasy (MDMA): a review of 15 years of empirical research Human Psychopharmacology: Clinical and Experimental December 1, 2001
- 3,4-Methylenedioxymethamphetamine (MDMA) neurotoxicity in rats: a reappraisal of past and present findings Psychopharmacology March 15, 2006
- Chronic tolerance to recreational MDMA (3,4-methylenedioxymethamphetamine) or Ecstasy Journal of Psychopharmacology 2005
- RETRACTED: Severe Dopaminergic Neurotoxicity in Primates After a Common Recreational Dose Regimen of MDMA ("Ecstasy") Science September 27, 2002
- MDMA (3,4-Methylenedioxymethamphetamine) or Ecstasy: The Neuropsychobiological Implications of Taking It at Dances and Raves Neuropsychobiology 2004
and 112 more in the library
Cites 24
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and 19 more in the library