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Striatal postsynaptic ultrastructural alterations following methylenedioxymethamphetamine administration.

F Fornai¹, M Gesi, P Lenzi

¹Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy. f.fornai@med.unipi.it

Annals of the New York Academy of Sciences

|July 10, 2002

Summary

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3,4-methylenedioxymethamphetamine (MDMA) causes unique ultrastructural changes in mouse striatal postsynaptic GABAergic cells. These alterations, characterized by ubiquitin-positive whorls, are the first observed postsynaptic effects of MDMA in the striatum.

Area of Science:

Neuroscience
Toxicology
Cell Biology

Background:

Amphetamine derivatives like methamphetamine (METH) and 3,4-methylenedioxymethamphetamine (MDMA) are known monoaminergic neurotoxins.
Their neurotoxicity involves dopamine release and oxidative stress, primarily affecting monoamine axons in the striatum.
Previous research has not identified postsynaptic alterations in the striatum following exposure to these compounds.

Purpose of the Study:

To investigate the ultrastructural effects of MDMA on intrinsic striatal neurons in mice.
To explore potential postsynaptic neurotoxic mechanisms of MDMA in the striatum.

Main Methods:

Administration of MDMA to mice.
Ultrastructural analysis of striatal neurons using electron microscopy.

Related Experiment Videos

Immunohistochemical staining for ubiquitin and synuclein.

Main Results:

MDMA administration induced distinct ultrastructural alterations in striatal postsynaptic GABAergic cells.
Observed alterations included the formation of neuronal inclusions shaped as whorls of concentric membranes.
These inclusions stained positive for ubiquitin but negative for synuclein.

Conclusions:

MDMA induces morphologic changes in striatal postsynaptic GABAergic neurons.
The identified ubiquitin-positive whorls represent the first ultrastructural evidence of postsynaptic effects of MDMA in the striatum.
These findings contribute to understanding the neurotoxic mechanisms of MDMA beyond axonal damage.