Biliary excretion of pyrrolic metabolites of [14C]monocrotaline in the rat

M. W. Lame, A. D. Jones, D. Morin, H. J. Segall, Dennis W Wilson

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Abstract

The biliary excretion of amphoteric pyrroles was studied using in situ isolated rat liver preparations perfused in a recirculatory manner for 60 to 90 min with 14C-monocrotaline (40 μmol/120 ml of Krebs-Henseleit buffer). After 90 min, 20% of the administered 14C and an amount of pyrrole equivalent to 9 μmol of dehydroretronecine was recovered in the bile. Bile collected between 15 and 30 min contained the highest levels of 14C and pyrrolic metabolites. Isoelectric focusing (IEF) and electrophoretic separations on matrices of polyacrylamide and silica were used to isolate and estimate levels of pyrrolic conjugates. IEF and electrophoretic separations on silica revealed the presence of six pyrrole-positive metabolites. Reactions of monocrotaline pyrrole with glutathione produced three conjugates that had the same pI values as components found in bile. Electrophoretic separations on silica and polyacrylamide followed by reversed phase chromatography removed sufficient biliary matrix contaminants to permit identification of glutathione and cysteinyl-glycine conjugates of 6,7- dihydro-7-hydroxy-1-hydroxymethyl-5H-pyrrolizine and 1-formyl-7-hydroxy-6,7- dihydro-5H-pyrrolizine with fast atom bombardment MS/MS. This study revealed a complexity in the biliary pyrrolic excretion profile that had not previously been realized.

Original languageEnglish (US)
Pages (from-to)422-429
Number of pages8
JournalDrug Metabolism and Disposition
Volume23
Issue number3
StatePublished - 1995

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Monocrotaline
Pyrroles
Metabolites
Bile
Silicon Dioxide
Rats
Isoelectric Focusing
cysteinylglycine
Glutathione
Reverse-Phase Chromatography
Chromatography
Liver
Impurities
Atoms
Hepatobiliary Elimination
polyacrylamide
dehydroretronecine

ASJC Scopus subject areas

  • Pharmacology
  • Toxicology

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Biliary excretion of pyrrolic metabolites of [14C]monocrotaline in the rat. / Lame, M. W.; Jones, A. D.; Morin, D.; Segall, H. J.; Wilson, Dennis W.

In: Drug Metabolism and Disposition, Vol. 23, No. 3, 1995, p. 422-429.

Research output: Contribution to journalArticle

Lame, MW, Jones, AD, Morin, D, Segall, HJ & Wilson, DW 1995, 'Biliary excretion of pyrrolic metabolites of [14C]monocrotaline in the rat', Drug Metabolism and Disposition, vol. 23, no. 3, pp. 422-429.
Lame, M. W. ; Jones, A. D. ; Morin, D. ; Segall, H. J. ; Wilson, Dennis W. / Biliary excretion of pyrrolic metabolites of [14C]monocrotaline in the rat. In: Drug Metabolism and Disposition. 1995 ; Vol. 23, No. 3. pp. 422-429.
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