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Titolo:
3,4-Methylenedioxymethamphetamine induces monoamine release, but not toxicity, when administered centrally at a concentration occurring following a peripherally injected nenrotoxic dose
Autore:
Esteban, B; OShea, E; Camarero, J; Sanchez, V; Green, AR; Colado, MI;
Indirizzi:
Univ Complutense, Fac Med, Dept Farmacol, Madrid 28040, Spain Univ Complutense Madrid Spain 28040 , Dept Farmacol, Madrid 28040, Spain De Montfort Univ, Sch Pharm & Pharmaceut Sci, Leicester LE1 9RH, Leics, England De Montfort Univ Leicester Leics England LE1 9RH LE1 9RH, Leics, England
Titolo Testata:
PSYCHOPHARMACOLOGY
fascicolo: 3, volume: 154, anno: 2001,
pagine: 251 - 260
Fonte:
ISI
Lingua:
ENG
Soggetto:
P-CHLOROAMPHETAMINE; MDMA ECSTASY; METHYLENEDIOXYMETHAMPHETAMINE ECSTASY; SEROTONERGIC TOXICITY; NERVE-TERMINALS; 5-HT NEURONS; RAT; BRAIN; DEGENERATION; DIZOCILPINE;
Keywords:
3,4-methylenedioxymethamphetamine microdialysis; 5-hydroxytryptamine; neurotoxicity; hyperthermia; dopamine; 5,7-dihydroxytryptamine;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Colado, MI Univ Complutense, Fac Med, Dept Farmacol, Madrid 28040, Spain Univ Complutense Madrid Spain 28040 acol, Madrid 28040, Spain
Citazione:
B. Esteban et al., "3,4-Methylenedioxymethamphetamine induces monoamine release, but not toxicity, when administered centrally at a concentration occurring following a peripherally injected nenrotoxic dose", PSYCHOPHAR, 154(3), 2001, pp. 251-260

Abstract

Rationale: There is good evidence that 3,4methylenedioxyme thamphetamine (MDMA)-induced neurotoxicity results from free radical formation. However, it is unclear whether it is the presence of MDMA or a metabolite in the brain that initiates this process. Objective: We wished to measure the concentration of MDMA in the brain following peripheral administration of neurotoxic doses and examine the effect on acute monoamine release and the subsequent neurotoxic loss in 5-hydroxytryptamine (5-HT) content when a high concentration of MDMA was infused into cerebral tissue. Methods: Selectively placed microdialysis probes were used to determine both the concentration of MDMA in the brain following peripheral injection and the degree of 5-HT release. Monoamines in dialysate and tissue were measured with standard HPLC techniques. Results: MDMA, administered intraperitoneally, at doses of 10 and 15 mg/kg, which produce neurodegeneration, resulted in an estimated cerebralextracellular concentration of MDMA of 11 and 20 muM, respectively. When MDMA (100-400 muM) was perfused through a selectively placed microdialysis probe it dose-dependently increased 5-HT release in the hippocampus and dopamine release in the striatum. Seven days after perfusion of MDMA the concentration of 5-HT and its metabolite, 5-hydroxyindoleacetic acid was unchanged in the ipsilateral side of the brain of normothermic rats and also in thebrains of animals made hyperthermic to mimic the acute effect of MDMA given peripherally. In contrast, perfusion with 5,7-dihydroxytryptamine (400 muM) markedly decreased the cerebral 5-HT content. A second probe, also placed in the hippocampus at a distance of 1 mm from the main probe, revealed that during the per fusion of MDMA (400 muM) the estimated extracellular concentration of MDMA in the hippocampus was between 10.4 and 19.5 muM, i.e. inthe range of concentrations observed after systemic injection of neurotoxic doses of MDMA. Conclusions: These data demonstrate that MDMA when injected directly into the brain produces 5-HT release but no neurotoxicity, suggesting that it must be metabolised peripherally in order to produce compounds that induce free radical formation and neurotoxicity in the brain.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 00:43:24