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Metabolism of a disulfiram metabolite, S-methyl N,N-diethyldithiocarbamate, by flavin monooxygenase in human renal microsomes.
Drug Metab Dispos. 2001 Feb; 29(2):127-32.DM

Abstract

S-Methyl N,N-diethyldithiocarbamate (MeDDC), a metabolite of the alcohol deterrent disulfiram, is converted to MeDDC sulfine and then S-methyl N,N-diethylthiocarbamate sulfoxide, the proposed active metabolite in vivo. Several isoforms of CYP450 and to a lesser extent flavin monooxygenase (FMO) metabolize MeDDC in the liver. The human kidney contains FMO1 and several isoforms of CYP450, including members of the CYP3A, CYP4A, CYP2B, and CYP4F subfamilies. In this study the metabolism of MeDDC by the human kidney was examined, and the enzymes responsible for this metabolism were determined. MeDDC was incubated with human renal microsomes from five donors or with insect microsomes containing human FMO1, CYP4A11, CYP3A4, CYP3A5, or CYP2B6. MeDDC sulfine was formed at 5 microM MeDDC by renal microsomes at a rate of 210 +/- 50 pmol/min/mg of microsomal protein (mean +/- S.D., n = 5) and by FMO1 at 7.6 +/- 0.2 nmol/min/nmol (n = 3). Oxidation of 5 microM MeDDC was negligible by all CYP450 tested (< or =0.03 nmol/min/nmol). Inhibition of FMO by methimazole or heat diminished MeDDC sulfine formation 75 to 89% in renal microsomes. Inhibition of CYP450 in renal microsomes by N-benzylimidazole or antibody to the CYP450 NADPH reductase had no effect on MeDDC sulfine production. Benzydamine N-oxidation, a probe for FMO activity, correlated with MeDDC sulfine formation in renal microsomes (r = 0.951, p = 0.013). The K(M) values for MeDDC sulfine formation by renal microsomes and recombinant human FMO1 were 11 and 15 microM, respectively. These results demonstrate a role for the kidney and FMO1 in the metabolism of MeDDC in humans.

Authors+Show Affiliations

Pike MG
Clinical Pharmacology Unit, Department of Pharmacology, Mayo Clinic/Foundation, Guggenheim 6, 200 First St. SW, Rochester, MN 55905, USA. pike.mary@mayo.edu
Mays DC
No affiliation info available
Macomber DW
No affiliation info available
Lipsky JJ
No affiliation info available

MeSH

Chromatography, High Pressure LiquidCytochrome P-450 Enzyme InhibitorsCytochrome P-450 Enzyme SystemDitiocarbEnzyme InhibitorsHumansImidazolesIsoenzymesKidneyKineticsMicrosomesNADPOxygenasesSpectrophotometry, Ultraviolet

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

11159801

Citation

Pike, M G., et al. "Metabolism of a Disulfiram Metabolite, S-methyl N,N-diethyldithiocarbamate, By Flavin Monooxygenase in Human Renal Microsomes." Drug Metabolism and Disposition: the Biological Fate of Chemicals, vol. 29, no. 2, 2001, pp. 127-32.
Pike MG, Mays DC, Macomber DW, et al. Metabolism of a disulfiram metabolite, S-methyl N,N-diethyldithiocarbamate, by flavin monooxygenase in human renal microsomes. Drug Metab Dispos. 2001;29(2):127-32.
Pike, M. G., Mays, D. C., Macomber, D. W., & Lipsky, J. J. (2001). Metabolism of a disulfiram metabolite, S-methyl N,N-diethyldithiocarbamate, by flavin monooxygenase in human renal microsomes. Drug Metabolism and Disposition: the Biological Fate of Chemicals, 29(2), 127-32.
Pike MG, et al. Metabolism of a Disulfiram Metabolite, S-methyl N,N-diethyldithiocarbamate, By Flavin Monooxygenase in Human Renal Microsomes. Drug Metab Dispos. 2001;29(2):127-32. PubMed PMID: 11159801.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Metabolism of a disulfiram metabolite, S-methyl N,N-diethyldithiocarbamate, by flavin monooxygenase in human renal microsomes. AU - Pike,M G, AU - Mays,D C, AU - Macomber,D W, AU - Lipsky,J J, PY - 2001/2/13/pubmed PY - 2001/3/27/medline PY - 2001/2/13/entrez SP - 127 EP - 32 JF - Drug metabolism and disposition: the biological fate of chemicals JO - Drug Metab Dispos VL - 29 IS - 2 N2 - S-Methyl N,N-diethyldithiocarbamate (MeDDC), a metabolite of the alcohol deterrent disulfiram, is converted to MeDDC sulfine and then S-methyl N,N-diethylthiocarbamate sulfoxide, the proposed active metabolite in vivo. Several isoforms of CYP450 and to a lesser extent flavin monooxygenase (FMO) metabolize MeDDC in the liver. The human kidney contains FMO1 and several isoforms of CYP450, including members of the CYP3A, CYP4A, CYP2B, and CYP4F subfamilies. In this study the metabolism of MeDDC by the human kidney was examined, and the enzymes responsible for this metabolism were determined. MeDDC was incubated with human renal microsomes from five donors or with insect microsomes containing human FMO1, CYP4A11, CYP3A4, CYP3A5, or CYP2B6. MeDDC sulfine was formed at 5 microM MeDDC by renal microsomes at a rate of 210 +/- 50 pmol/min/mg of microsomal protein (mean +/- S.D., n = 5) and by FMO1 at 7.6 +/- 0.2 nmol/min/nmol (n = 3). Oxidation of 5 microM MeDDC was negligible by all CYP450 tested (< or =0.03 nmol/min/nmol). Inhibition of FMO by methimazole or heat diminished MeDDC sulfine formation 75 to 89% in renal microsomes. Inhibition of CYP450 in renal microsomes by N-benzylimidazole or antibody to the CYP450 NADPH reductase had no effect on MeDDC sulfine production. Benzydamine N-oxidation, a probe for FMO activity, correlated with MeDDC sulfine formation in renal microsomes (r = 0.951, p = 0.013). The K(M) values for MeDDC sulfine formation by renal microsomes and recombinant human FMO1 were 11 and 15 microM, respectively. These results demonstrate a role for the kidney and FMO1 in the metabolism of MeDDC in humans. SN - 0090-9556 UR - https://www.unboundmedicine.com/medline/citation/11159801/Metabolism_of_a_disulfiram_metabolite_S_methyl_NN_diethyldithiocarbamate_by_flavin_monooxygenase_in_human_renal_microsomes_ DB - PRIME DP - Unbound Medicine ER -