Document Detail

Mephedrone does not damage dopamine nerve endings of the striatum, but enhances the neurotoxicity of methamphetamine, amphetamine, and MDMA.
MedLine Citation:
PMID:  23205838     Owner:  NLM     Status:  MEDLINE    
Mephedrone (4-methylmethcathinone) is a β-ketoamphetamine stimulant drug of abuse with close structural and mechanistic similarities to methamphetamine. One of the most powerful actions associated with mephedrone is the ability to stimulate dopamine (DA) release and block its re-uptake through its interaction with the dopamine transporter (DAT). Although mephedrone does not cause toxicity to DA nerve endings, its ability to serve as a DAT blocker could provide protection against methamphetamine-induced neurotoxicity like other DAT inhibitors. To test this possibility, mice were treated with mephedrone (10, 20, or 40 mg/kg) prior to each injection of a neurotoxic regimen of methamphetamine (four injections of 2.5 or 5.0 mg/kg at 2 h intervals). The integrity of DA nerve endings of the striatum was assessed through measures of DA, DAT, and tyrosine hydroxylase levels. The moderate to severe DA toxicity associated with the different doses of methamphetamine was not prevented by any dose of mephedrone but was, in fact, significantly enhanced. The hyperthermia caused by combined treatment with mephedrone and methamphetamine was the same as seen after either drug alone. Mephedrone also enhanced the neurotoxic effects of amphetamine and 3,4-methylenedioxymethamphetamine on DA nerve endings. In contrast, nomifensine protected against methamphetamine-induced neurotoxicity. As mephedrone increases methamphetamine neurotoxicity, the present results suggest that it interacts with the DAT in a manner unlike that of other typical DAT inhibitors. The relatively innocuous effects of mephedrone alone on DA nerve endings mask a potentially dangerous interaction with drugs that are often co-abused with it, leading to heightened neurotoxicity.
Mariana Angoa-Pérez; Michael J Kane; Denise I Briggs; Dina M Francescutti; Catherine E Sykes; Mrudang M Shah; David M Thomas; Donald M Kuhn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2013-01-08
Journal Detail:
Title:  Journal of neurochemistry     Volume:  125     ISSN:  1471-4159     ISO Abbreviation:  J. Neurochem.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-22     Completed Date:  2013-05-13     Revised Date:  2014-04-02    
Medline Journal Info:
Nlm Unique ID:  2985190R     Medline TA:  J Neurochem     Country:  England    
Other Details:
Languages:  eng     Pagination:  102-10     Citation Subset:  IM    
Copyright Information:
© 2012 International Society for Neurochemistry.
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MeSH Terms
Amphetamine / toxicity*
Corpus Striatum / drug effects,  metabolism,  ultrastructure
Dopamine / metabolism*
Drug Synergism
Fever / chemically induced,  physiopathology
Methamphetamine / analogs & derivatives*,  toxicity*
Mice, Inbred C57BL
N-Methyl-3,4-methylenedioxyamphetamine / toxicity*
Nerve Endings / drug effects*,  metabolism
Psychotropic Drugs / toxicity*
Grant Support
Reg. No./Substance:
0/Psychotropic Drugs; 44RAL3456C/Methamphetamine; 8BA8T27317/mephedrone; CK833KGX7E/Amphetamine; KE1SEN21RM/N-Methyl-3,4-methylenedioxyamphetamine; VTD58H1Z2X/Dopamine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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