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Morphological effects in the mouse myocardium after methylenedioxymethamphetamine administration combined with loud
Marco Gesi1, Paola Lenzi, Paola Soldani
1Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy. m.gesi@anist.med.unipi.it
Abstract:
Early toxicity occurring during or immediately after 3,4-methylenedioxymethamphetamine (MDMA, or "ecstasy") administration has not been investigated in detail, although in humans it is responsible for marked side effects, and even death. Acute toxicity induced by MDMA produces rhabdomyolysis involving the myocardium (myocytolysis). Cardiac symptoms, such as tachycardia, hypertension, and arrhythmia, are present to a variable extent in humans abusing ecstasy. In most cases, this substance is abused in the presence of loud noise, which may affect the myocardium. Despite the frequency of the concomitant exposure to ecstasy and loud noise, and the similarities between the early side effects of these two agents, to our knowledge no study has investigated the role of loud noise in modulating MDMA toxicity. Therefore, in the present study, we evaluated whether cardiac effects of MDMA administration following a typical "binging" pattern are enhanced by concomitant exposure to loud noise. We selected low doses of MDMA in order to avoid gross morphological alterations, or lesions detectable under light microscopy. The myocardial alterations observed were visible only at the ultrastructural level. We found a dramatic enhancement of alterations in the mouse heart upon MDMA administration during loud noise exposure. Remarkably, this enhancement was evident both as a decrease in the threshold dose of MDMA necessary to alter the myocardial ultrastructure, and as an increase in myocardial alterations produced by a higher dose of MDMA.
Insights
Loud noise significantly amplifies the cardiac toxicity of 3,4-methylenedioxymethamphetamine (MDMA, or "ecstasy"). This study reveals that noise exposure lowers the MDMA dose needed to damage heart tissue and intensifies damage at higher doses.
Area of Science:
- Cardiovascular Toxicology
- Neuropharmacology
- Environmental Health
Background:
- Early toxicity of 3,4-methylenedioxymethamphetamine (MDMA) is understudied, despite causing severe side effects and death.
- MDMA-induced acute toxicity involves myocardial rhabdomyolysis and cardiac symptoms like tachycardia and hypertension.
- MDMA is often abused in environments with loud noise, a potential cardiac stressor.
Purpose of the Study:
- To investigate if loud noise exposure enhances MDMA-induced cardiac toxicity.
- To evaluate the role of noise in modulating MDMA's effects on the myocardium.
- To assess cardiac alterations at the ultrastructural level using low MDMA doses.
Main Methods:
- Administered low doses of MDMA to mice to avoid gross morphological changes.
- Exposed mice to loud noise concurrently with MDMA administration.
- Analyzed myocardial alterations at the ultrastructural level using electron microscopy.
Main Results:
- Concomitant exposure to loud noise dramatically enhanced MDMA-induced cardiac alterations in mice.
- Loud noise decreased the threshold dose of MDMA required to induce ultrastructural myocardial damage.
- Higher doses of MDMA produced increased myocardial alterations when administered during noise exposure.
Conclusions:
- Loud noise significantly potentiates the cardiotoxic effects of MDMA.
- This synergistic toxicity occurs at the ultrastructural level, affecting myocardial integrity.
- Findings highlight the critical role of environmental factors in modulating drug toxicity.