title: The pharmacokinetics and liver metabolism of N-hydroxy-3,4-methylenedioxyamphetamine (N-OH MDA) in rats.
abstract: The metabolism and disposition of N-hydroxy-3,4-methylenedioxyamphetamine (N-OH MDA) was studied by utilizing rat liver slices as well as by intravenous pharmacokinetic studies in rats. In the liver slice experiments, N-OH MDA (16 micrograms/ml) was incubated with rat liver slices and the disappearance of N-OH MDA and the appearance of MDA were observed over 2 hours. Drug and metabolites were assayed by a reverse phase high performance liquid chromatographic procedure including a C8 column and UV detection. N-OH MDA disappeared from the plasma at an apparent first-order rate with a t1/2 of 36.3 +/- 8.4 min. By the end of 2 hours, approximately 85% of the N-OH MDA was biotransformed to MDA. Following placement of jugular cannulas in rats, a dose of 15 mg/kg of N-OH MDA was administered intravenously. With rapid blood sampling, a t1/2 of 0.86 +/- 0.12 min was observed for N-OH MDA. A total body clearance of 9.09 +/- 2.06 L/hr/kg and a volume of distribution of 0.184 +/- 0.022 L/kg were noted. Plasma concentrations of MDA were observed after the N-OH MDA dose to rats. The MDA t1/2 after N-OH MDA dosing was 1.68 +/- 0.29 hours with peak plasma concentrations at 8 min. No other major metabolites could be detected in liver slice, plasma, or urine samples. Both sets of studies demonstrate the rapid conversion of N-OH MDA to MDA in rats.
authors.affiliation: Department of Pharmacal Sciences, School of Pharmacy, Auburn University, Alabama 36849-5503.
authors.forename: W R
authors.initials: WR
authors.lastname: Ravis
authors.forename: A K
authors.initials: AK
authors.lastname: Valaer
authors.forename: D
authors.initials: D
authors.lastname: Brzozowski
authors.forename: C R
authors.initials: CR
authors.lastname: Clark
mesh_terms: D015104:3,4-Methylenedioxyamphetamine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000493:pharmacokinetics; D000818:Animals; D001711:Biotransformation; D006207:Half-Life; D066298:In Vitro Techniques; D008099:Liver / Q000378:metabolism*; D008297:Male; D008657:Metabolic Clearance Rate; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D015104:3,4-Methylenedioxyamphetamine; C062690:N-hydroxy-1-(3,4-methylenedioxyphenyl)-2-aminopropane