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The abused drug MDMA (Ecstasy) induces programmed death of human serotonergic cells
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.
Abstract:
The widely abused amphetamine analog 3,4-methylenedioxymethamphetamine (MDMA, also called "ecstasy") induces hallucination and psychostimulation, as well as long-term neuropsychiatric behaviors such as panic and psychosis. In rodents and monkeys, MDMA is cytotoxic to serotonergic neurons, but this is less clear with humans. Herein, MDMA was cytotoxic to human serotonergic JAR cells; it altered the cell cycle, increased G2/M phase arrest, and induced DNA fragmentation in a cycloheximide-sensitive way. This apoptosis was not observed in nonserotonergic human NMB cells. The stereospecific effect of amphetamines in JAR cells, and the key role of NO and dopamine in MDMA-induced apoptosis were determined. The relevancy of MDMA-induced cell death to drug users is discussed.
Insights
3,4-methylenedioxymethamphetamine (MDMA) causes human serotonin neuron death by altering cell cycles and DNA. This MDMA-induced apoptosis was specific to serotonergic cells, highlighting potential risks for drug users.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- 3,4-methylenedioxymethamphetamine (MDMA), or "ecstasy," is a widely abused amphetamine analog known for psychostimulant and hallucinogenic effects.
- MDMA is known to be cytotoxic to serotonergic neurons in animal models, but its effects on human neurons are less understood.
- Long-term neuropsychiatric effects, including panic and psychosis, are associated with MDMA abuse.
Purpose of the Study:
- To investigate the cytotoxicity of MDMA on human serotonergic neurons.
- To elucidate the mechanisms underlying MDMA-induced cell death in human serotonergic cells.
- To determine the role of specific signaling molecules in MDMA's neurotoxic effects.
Main Methods:
- Utilized human serotonergic JAR cells and nonserotonergic NMB cells for comparative studies.
- Analyzed cell cycle alterations, G2/M phase arrest, and DNA fragmentation.
- Investigated the involvement of nitric oxide (NO) and dopamine in the apoptotic process.
- Assessed the stereospecific effects of amphetamines on JAR cells.
Main Results:
- MDMA demonstrated cytotoxicity specifically towards human serotonergic JAR cells, but not nonserotonergic NMB cells.
- MDMA induced alterations in the cell cycle, leading to increased G2/M phase arrest and DNA fragmentation.
- The observed apoptosis was sensitive to cycloheximide, indicating an active cell death process.
- Nitric oxide and dopamine were identified as key players in MDMA-induced apoptosis.
- Stereospecific effects of amphetamines were observed in JAR cells.
Conclusions:
- MDMA induces apoptosis in human serotonergic neurons through mechanisms involving cell cycle disruption and DNA damage.
- The neurotoxic effects of MDMA are specific to serotonergic cells and are mediated by NO and dopamine pathways.
- Findings highlight the potential cellular basis for MDMA's adverse effects on the human nervous system and its relevance to drug users.