32Postabelling analysis of urinary mutagens from smokers of black tobacco implicates 2-amino-1-methyl-6-phnylimidazo[4,5-b]pyridine (PhIP) as a major DNA-damaging agent
- 1 April 1991
- journal article
- research article
- Published by Oxford University Press (OUP) in Carcinogenesis: Integrative Cancer Research
- Vol. 12 (4) , 713-717
- https://doi.org/10.1093/carcin/12.4.713
Abstract
When mutagens extracted from the urine of two smokers of black tobacco were reacted with DNA in vitro in the presence of a metabolic activation system, several DNA adducts were detected by 32P-postlabelling analysis. Some of these adducts were also visible, but only faintly, on the autoradiogram for a non-smoker's urine. DNA adducts produced in vitro by 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline or 2-amino-1-methyl-6-phenlimidazo[3,5-b]pyridine could not account for the adduct pattern produced by the urinary mutagens. However, three or four 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)-related DNA adducts were present among the five or six adducts observed for smokers in the autoradiograms of urinary mutagen-adducted nucleotides. Mutagenicity testing combined with HPLC fractionation of urinary extracts also supported the patlabelling data which implicates PhIP as a mutagen in the urine of smokers of black tobacco.Keywords
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