Occurrence of a cytochrome P-450-containing mixed-function oxidase system in the pond snail, Lymnaea stagnalis

M Wilbrink, E J Groot, R Jansen, Y. de Vries, N P Vermeulen

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

1. The occurrence of an as yet unidentified cytochrome P-450 in the microsomal fraction of the digestive gland of the snail, Lymnaea stagnalis was studied. 2. Studies in vivo and in vitro (digestive gland homogenates or the 170,000g fraction) of the cytochrome P-450-mediated metabolism of substrates such as biphenyl, pentoxy- and ethoxy-resorufin and aminopyrine have been made. 3. Cytochrome P-450 concentration in the digestive gland calculated from CO-difference spectra was 0.30 +/- 0.05 nmol/g tissue. This amount was not increased either by phenobarbital or by 3-methylcholanthrene. 4. Aniline binding spectra resembled normal type II spectra, while type I model substrates such as hexobarbital and 2,2'-dichlorobiphenyl showed type II- or reversed type I-like spectra. 5. O-Deethylation of 7-ethoxyresorufin did not occur, but 7-pentoxyresorufin O-depentylation activity (80.4 +/- 28.6 pmol resorufin/g per hour) and aminopyrine N-demethylation activity (375 +/- 96 pmol formaldehyde/g per minute) were demonstrated. 6. 4-Hydroxybiphenyl was the major metabolite of biphenyl, while minor amounts of 2-hydroxybiphenyl were formed (in vivo: 63.7 nmol 4-hydroxybiphenyl and 3.33 nmol 2-hydroxybiphenyl per snail per 24 h, after an oral dose of 778.2 nmol biphenyl; in vitro 118 +/- 21 pmol and 21 +/- 9 nmol, respectively (digestive gland homogenate/mg protein, per hour). 7. The results indicate that the isoenzymes involved in the observed MFO activities resemble isoenzymes P-450b/e.

Original languageEnglish
Pages (from-to)223-33
Number of pages11
JournalXenobiotica
Volume21
Issue number2
DOIs
Publication statusPublished - Feb 1991

Keywords

  • Aminopyrine N-Demethylase
  • Aniline Compounds
  • Animals
  • Cytochrome P-450 CYP1A1
  • Cytochrome P-450 CYP2B1
  • Cytochrome P-450 Enzyme System
  • Digestive System
  • Hexobarbital
  • Hydroxylation
  • Lymnaea
  • Microsomes
  • Mixed Function Oxygenases
  • Oxidoreductases
  • Polychlorinated Biphenyls
  • Spectrophotometry
  • Substrate Specificity
  • Journal Article

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