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Early loss of dopaminergic terminals in striosomes after MDMA administration to mice
Noelia Granado1, Isabel Escobedo, Esther O'Shea
1Instituto Cajal, Consejo Superior de Investigaciones Científicas, CSIC, Madrid 28002, Spain.
Abstract:
The amphetamine analogue 3,4-methylenedioxymethamphetamine (MDMA or "Ecstasy") is a popular drug of abuse which causes different neurotoxic effects in the mouse compared with the rat. In mice, MDMA produces damage to striatal dopamine terminals, having little long-term effects on serotonin (5-HT) containing neurons. A relevant feature of the striatum is its striosome/matrix compartmental organization; defined by different connexions, and functions. In this study we examined the long-term effect induced by MDMA on tyrosine hydroxylase (TH) and dopamine transporter (DAT) immunoreactivity in the striosomes and matrix compartments of mouse striatum. Mice given MDMA showed significant reductions in TH and DAT immunostaining in striatum compared with control animals. Interestingly, this effect was considerably more pronounced in striosomes than in the matrix. These data provide the first evidence that striosomes and matrix compartments of the mouse striatum have differential vulnerability to MDMA and that the long-term neurotoxicity induced by MDMA in mice is primarily associated with a loss of striosomal dopamine fibres.
Insights
3,4-methylenedioxymethamphetamine (MDMA) causes long-term neurotoxicity in mice, primarily damaging dopamine fibers in the striosomes of the striatum. This effect is more pronounced in striosomes than in the matrix, indicating differential vulnerability.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- 3,4-methylenedioxymethamphetamine (MDMA), known as "Ecstasy", is a widely abused amphetamine analogue.
- MDMA exhibits distinct neurotoxic effects in mice versus rats.
- In mice, MDMA primarily damages striatal dopamine terminals with minimal long-term impact on serotonin neurons.
Purpose of the Study:
- To investigate the long-term effects of MDMA on dopamine system markers.
- To examine MDMA's impact on the striosome and matrix compartments of the mouse striatum.
- To determine if these compartments exhibit differential vulnerability to MDMA neurotoxicity.
Main Methods:
- Mice were administered MDMA.
- Immunohistochemistry was used to assess tyrosine hydroxylase (TH) and dopamine transporter (DAT) immunoreactivity.
- Staining was quantified in the striosome and matrix compartments of the striatum.
Main Results:
- MDMA administration led to significant reductions in both TH and DAT immunostaining in the mouse striatum compared to controls.
- The reduction in TH and DAT immunoreactivity was markedly more pronounced within the striosomes than in the matrix compartment.
- These findings highlight a differential vulnerability of striatal compartments to MDMA.
Conclusions:
- The study provides the first evidence of differential vulnerability between striosomes and matrix compartments in the mouse striatum following MDMA exposure.
- Long-term neurotoxicity of MDMA in mice is predominantly linked to the loss of dopamine fibers within the striosomal compartment.
- This compartmental specificity is crucial for understanding MDMA's neurotoxic mechanisms.
