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Rat-liver Microsomal Metabolism of 2-halogenated 4-methylanilines

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Boeren, S. Tyrakowska, B. Vervoort, J. Dehoffman, E. Teunis, K. Rietjens, IMCM.

1. Rat liver microsomal metabolism of 2-fluoro-, 2-chloro- and 2-bromo-4-methylaniline was investigated using h.p.l.c. Metabolites identified include products from side-chain C-hydroxylation (benzyl alcohols and benzaldehydes) and N-hydroxylation (hydroxylamines and nitroso derivatives). Aromatic ring hydroxylation was not a major reaction pathway. 2. A new type of microsomal metabolite was detected which was identified as a secondary amine, i.e. a halogenated N-(4'-aminobenzyl)-4-methylaniline. 3. In addition to these products azoxy, azo and hydrazo derivatives were formed. 4. Benzyl alcohols and halogenated N-(4'-aminobenzyl)-4-methylanilines were the major microsomal metabolites for all three 2-halogenated 4-methylanilines. 5. Quantification of the metabolite patterns demonstrated an influence of the type of halogen substituent on the rate of microsomal metabolism. The rate of side-chain C-hydroxylation increases in the order 2-fluoro-4-methylaniline < 2-chloro-4-methylaniline < 2-bromo-4-methylaniline. 6. The rate of N-hydroxylation increases from 2-bromo-4-methylaniline < 2-fluoro-4-methylaniline < 2-chloro-4-methylaniline. That 2-chloro-4-methylaniline is N-hydroxylated to a larger extent is in accordance with its greater mutagenicity, twice that of 2-bromo-4-methylaniline.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 1992
Language Anglais
Journal information "Xenobiotica : the fate of foreign compounds in biological systems" - Vol. 22, no. 12, p. 1403-1423 (1992)
Peer reviewed yes
Publisher Taylor & Francis Ltd (London)
issn 0049-8254
e-issn 1366-5928
Publication status Publié
Affiliation UCL
Links
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Bibliographic reference Boeren, S. ; Tyrakowska, B. ; Vervoort, J. ; Dehoffman, E. ; Teunis, K. ; et. al. Rat-liver Microsomal Metabolism of 2-halogenated 4-methylanilines. In: Xenobiotica : the fate of foreign compounds in biological systems, Vol. 22, no. 12, p. 1403-1423 (1992)
Permanent URL http://hdl.handle.net/2078.1/49938