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1Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy. f.fornai@med.unipi.it
Abstract:
The psychostimulant 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy") is an amphetamine derivative that is widely abused. In previous studies, depending on the animal species, neurotoxicity has been demonstrated for either serotonin (5-HT) or/and dopamine (DA) nerve endings. These studies focused on the basal ganglia circuitry; however, in humans chronic abuse of MDMA often results in neurological symptoms that last after MDMA withdrawal and are not related to the extrapyramidal system such as electroencephalographic (EEG) abnormalities and cognitive impairment. These alterations might be due to the concomitant intake of other illicit compounds, the consequence of MDMA-induced hyperthermia, or to a primary neurotoxicity directed to extrastriatal regions. These observations call for a more in-depth analysis on the potential involvement of brain areas outside the basal ganglia in the toxic effects induced primarily by MDMA. In the present study, we treated C57Black mice chronically (25 days) with daily injections of MDMA (2.5 mg/kg). During treatments, mice were monitored in order to detect behavioral modifications, and epidural electrodes were installed to perform EEG recording. Behavioral data showed a sensitization as measured by locomotor activity, which related to progressive and long-lasting EEG changes and neuronal degeneration within the hippocampus.
Insights
Chronic 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy") abuse in mice caused long-lasting electroencephalographic (EEG) changes and neuronal damage in the hippocampus, indicating extrastriatal neurotoxicity beyond the basal ganglia.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy") is a widely abused psychostimulant.
- Previous studies primarily focused on MDMA's neurotoxicity in the basal ganglia, affecting serotonin (5-HT) and dopamine (DA) nerve endings.
- Human MDMA abuse is linked to persistent neurological symptoms, including EEG abnormalities and cognitive deficits, suggesting extrastriatal effects.
Purpose of the Study:
- To investigate the potential neurotoxic effects of MDMA on brain areas outside the basal ganglia.
- To analyze MDMA's impact on electroencephalographic (EEG) activity and neuronal integrity in extrastriatal regions.
Main Methods:
- C57Black mice were chronically treated with MDMA (2.5 mg/kg daily for 25 days).
- Behavioral modifications, including locomotor activity, were monitored.
- Epidural electrodes were implanted for electroencephalographic (EEG) recording.
Main Results:
- MDMA treatment led to behavioral sensitization, evidenced by increased locomotor activity.
- Progressive and long-lasting changes in EEG recordings were observed.
- Neuronal degeneration was identified within the hippocampus, an extrastriatal brain region.
Conclusions:
- Chronic MDMA administration induces neurotoxicity in extrastriatal regions, specifically the hippocampus.
- Observed EEG abnormalities and neuronal degeneration correlate with behavioral sensitization.
- Findings suggest MDMA's neurotoxic effects extend beyond the basal ganglia, contributing to persistent neurological symptoms.
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