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Author(s): Felix Carvalho
Maria Elisa Soares
Eduarda Fernandes
Fernando Remiao
Marcia Carvalho
Jose Alberto Duarte
Ricardo Pires das Neves
Maria de Lourdes Pereira
Maria de Lourdes Bastos
Title: Repeated administration of d-amphetamine results in a time-dependent and dose-independent sustained increase in urinary excretion of p-hydroxyamphetamine in mice
Issue Date: 2007
Abstract: The biotransformation of d-amphetamine into p-hydroxyamphetamine (HA) by cytochrome P450 occurs in several species besides humans. The extent of HA excretion varies among species and the oxidative pathway involved in this biotransformation is reported to be implicated in the toxic effects of d-amphetamine. The aim of this study was to evaluate the influence of dose and repeated administration of d-amphetamine on the urinary excretion of d-amphetamine and HA in mice. Charles River Caesarian Derived (CD)-1 mice, kept in metabolic cages, were treated with d-amphetamine (5, 10 and 20mg/kg, i.p., daily, for 14days). Urine was collected at 24 hr intervals and analyzed by HPLC for the quantification of d-amphetamine and HA. Urinary excretion of damphetamine increased in a dose dependent manner, the urinary levels being fairly constant after the 4th day. On the other hand the urinary excretion of HA increased during the whole time of d-amphetamine dosing and was not dose dependent. Cortical tubule degeneration was observed for the two higher doses, which may explain the HA excretion pattern, although inhibition of cytochrome P450 (CYP) after high d-amphetamine dosing may also be involved.
Subject: Medicina básica
Basic medicine
Scientific areas: Ciências médicas e da saúde::Medicina básica
Medical and Health sciences::Basic medicine
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FADEUP - Artigo em Revista Científica Internacional
FFUP - Artigo em Revista Científica Internacional

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