Urinary acetylated metabolites and N-acetyltransferase-2 genotype in human subjects treated with a para-phenylenediamine-containing oxidative hair dye

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
Gerhard J NohynekHerve Toutain

Abstract

In the organism of mammals, important detoxification pathways of arylamines are catalysed by N-acetyltransferase 2 (NAT2). A recent case-control epidemiology study suggested that human NAT2 slow acetylators exposed to oxidative hair dyes may be at greater risk to develop bladder cancer. We therefore profiled urinary [(14)C]-metabolites and NAT2 genotype in eight human subjects following treatment with a dark-shade oxidative hair dye containing [(14)C]-para-phenylenediamine (PPD). Genotyping identified three subjects as slow, and five subjects as intermediate NAT2 acetylators. Within 24 h after treatment, the study subjects excreted a mean total of 0.43+/-0.24% of the applied [(14)C] in the urine, where five different metabolites were found. The major urinary metabolites were concluded to be N-mono-acetylated and N,N'-diacetylated PPD. They were present in all urine samples and amounted to 80-95% of the total urinary [(14)C]. Another metabolite, possibly a glucuronic acid conjugate, was found in 6/8 urine samples at 5-13% of the total urinary [(14)C]. All metabolites appeared to be related to PPD, no evidence of the presence of high-molecular weight dye-intermediates or corresponding metabolites was found. The metabolite profile...Continue Reading

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