Amphetamines induce ubiquitin-positive inclusions within striatal cells.
The present study explores whether effects induced by amphetamine derivatives on striatal GABA cells might be connected with effects on dopamine (DA) metabolism. Methamphetamine (METH) and 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy") were administered to C57Black mice following a dosage regimen in which various doses of both drugs were injected i.p. at 2-h intervals. Neuronal inclusions produced under these experimental conditions were examined under electron microscopy. Drugs reducing DA availability prevented inclusion formation; conversely we observed that increasing DA synthesis or impairing physiological DA degradation enhanced the number of inclusions. The present study indicates that the presence of extracellular striatal DA is essential for the production of subcellular alterations induced by amphetamine derivatives. This is in line with a recent hypothesis connecting striatal DA release with degeneration of striatal GABA neurons.
Department of Human Morphology and Applied Biology, University of Pisa, Via Roma 55, Pisa, Italy.
F
F
Fornai
G
G
Lazzeri
P
P
Lenzi
M
M
Gesi
M
M
Ferrucci
P
P
Soldani
A
A
Pellegrini
L
L
Capobianco
A
A
De Blasi
S
S
Ruggieri
A
A
Paparelli
D018759:Adrenergic Uptake Inhibitors / Q000633:toxicity*; D000818:Animals; D002452:Cell Count; D003342:Corpus Striatum / Q000166:cytology*; D004298:Dopamine / Q000378:metabolism; D015259:Dopamine Agents / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D005968:Glutamate Decarboxylase / Q000378:metabolism; D002479:Inclusion Bodies / Q000187:drug effects*; D007527:Isoenzymes / Q000378:metabolism; D008297:Male; D008694:Methamphetamine / Q000633:toxicity*; D051379:Mice; D008810:Mice, Inbred C57BL; D008854:Microscopy, Electron; D018817:N-Methyl-3,4-methylenedioxyamphetamine / Q000633:toxicity; D009474:Neurons / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D025801:Ubiquitin / Q000032:analysis*
D018759:Adrenergic Uptake Inhibitors; D015259:Dopamine Agents; D007527:Isoenzymes; D025801:Ubiquitin; D008694:Methamphetamine; D005968:Glutamate Decarboxylase; C402565:glutamate decarboxylase 1; D018817:N-Methyl-3,4-methylenedioxyamphetamine; D004298:Dopamine