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Primary aromatic amines: their N-oxidative bioactivation

P Hlavica1, I Golly, M Lehnerer

  • 1Walther-Straub-Institut für Pharmokologie und Toxikologie, Universität München, Germany.

Human & Experimental Toxicology
|August 1, 1997
PubMed
Summary

Mammalian cells activate primary aromatic amines through various pathways, including cytochrome P450 and flavin-containing monooxygenases. Different tissues and conditions, like light exposure, influence these metabolic activation processes.

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Area of Science:

  • Biochemistry
  • Toxicology
  • Cell Biology

Background:

  • Primary aromatic amines undergo diverse metabolic activation pathways in mammalian cells.
  • Cytochrome P450 enzymes and flavin-containing monooxygenases are key players in N-oxidative metabolism.
  • Other enzymes like hemoglobin and peroxidases, as well as non-enzymatic processes, also contribute to amine activation.

Purpose of the Study:

  • To elucidate the various pathways involved in the metabolic activation of primary aromatic amines in mammalian cells.
  • To understand the role of different enzymes and conditions in arylamine metabolism.
  • To explain tissue-specific differences in susceptibility to the biological actions of primary aromatic amines.

Main Methods:

  • Review of existing literature on mammalian cell pathways for primary aromatic amine activation.

Related Experiment Videos

  • Analysis of enzymatic mechanisms including cytochrome P450, flavin-containing monooxygenases, hemoglobin, and peroxidases.
  • Consideration of non-enzymatic, light-induced reactions.

    • Main Results:

    • N-oxidative mixed-function turnover is primarily mediated by cytochrome P450 superfamily.
    • Flavin-containing monooxygenases catalyze reactions for a limited subset of amines forming imine tautomers.
    • Hemoglobin exhibits both monooxygenase-like and peroxygenase activity towards cytotoxic and carcinogenic arylamines.
    • Peroxidative transformations by prostaglandin H synthase, myeloperoxidase, and lactoperoxidase are dominant in extrahepatic tissues.
    • Non-enzymatic photolysis and lipid-derived radical attack contribute to amine conversion under irradiation.

    Conclusions:

    • Mammalian cells employ a complex network of enzymatic and non-enzymatic pathways for primary aromatic amine activation.
    • Tissue-specific expression of enzymes and environmental factors like light significantly influence arylamine metabolism.
    • Understanding these diverse activation routes is crucial for explaining differential susceptibility to the toxicological effects of aromatic amines.