Methadone metabolism by early gestational age placentas

Todd Lewis Hieronymus, Tatiana Nanovskaya, Sujal V. Deshmukh, Ricardo Vargas, Gary Hankins, Mahmoud Ahmed

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The objective of this study was to identify the enzyme that metabolizes methadone in preterm placentas. Microsomal fractions were obtained from preterm (17 to 34 weeks) placentas (36 total; 12 per each gestational age group) and their activity in metabolizing methadone to 2-ethylidene-1,5-dimethyl-3,3- diphenylpyrrolidine (EDDP) was determined. The enzyme catalyzing the reaction was identified by using chemical inhibitors selective for various cytochrome P450 isozymes and monoclonal antibodies raised against them. The metabolism of methadone by microsomes revealed saturation kinetics. Methadone was N-demethylated to EDDP by aromatase. The affinity of methadone to aromatase (apparent Km) did not change with gestation, but the activity of the enzyme ( Vmax) increased and varied widely between individual placentas. Aromatase/CYP19 is the placental enzyme metabolizing methadone during pregnancy. The variability in enzyme activity among individuals should be reflected by the concentration of methadone in the fetal circulation and might be one of the factors affecting the incidence and intensity of neonatal abstinence syndrome.

Original languageEnglish (US)
Pages (from-to)287-294
Number of pages8
JournalAmerican Journal of Perinatology
Volume23
Issue number5
DOIs
StatePublished - Jul 2006

Fingerprint

Methadone
Placenta
Gestational Age
Aromatase
Enzymes
Neonatal Abstinence Syndrome
Pregnancy
Microsomes
Cytochrome P-450 Enzyme System
Isoenzymes
Age Groups
Monoclonal Antibodies
Incidence

Keywords

  • Human placental aromatase/CYP19
  • Methadone maintenance programs
  • Pregnancy

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Obstetrics and Gynecology

Cite this

Methadone metabolism by early gestational age placentas. / Hieronymus, Todd Lewis; Nanovskaya, Tatiana; Deshmukh, Sujal V.; Vargas, Ricardo; Hankins, Gary; Ahmed, Mahmoud.

In: American Journal of Perinatology, Vol. 23, No. 5, 07.2006, p. 287-294.

Research output: Contribution to journalArticle

Hieronymus, Todd Lewis ; Nanovskaya, Tatiana ; Deshmukh, Sujal V. ; Vargas, Ricardo ; Hankins, Gary ; Ahmed, Mahmoud. / Methadone metabolism by early gestational age placentas. In: American Journal of Perinatology. 2006 ; Vol. 23, No. 5. pp. 287-294.
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