The pharmacokinetics and liver metabolism of N-hydroxy-3,4-methylenedioxyamphetamine (N-OH MDA) in rats

Life Sci. 1994;54(26):PL519-24. doi: 10.1016/0024-3205(94)00726-8.

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.

MeSH terms

  • 3,4-Methylenedioxyamphetamine / analogs & derivatives*
  • 3,4-Methylenedioxyamphetamine / metabolism
  • 3,4-Methylenedioxyamphetamine / pharmacokinetics
  • Animals
  • Biotransformation
  • Half-Life
  • In Vitro Techniques
  • Liver / metabolism*
  • Male
  • Metabolic Clearance Rate
  • Rats
  • Rats, Sprague-Dawley

Substances

  • 3,4-Methylenedioxyamphetamine
  • N-hydroxy-1-(3,4-methylenedioxyphenyl)-2-aminopropane