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Carcinogenesis, Vol 18, 2205-2208, Copyright © 1997 by Oxford University Press

ARTICLES

DNA adducts in human nasal mucosa and white blood cells from smokers and non-smokers

C Zhao, A Georgellis, S Flato, L Palmberg, E Thunberg and K Hemminki
Karolinska Institute, Center for Nutrition and Toxicology, NOVUM, Huddinge, Sweden.

The goal of the present study was to measure the levels of DNA adducts in human nasal mucosa cells and in total white blood cells in relation to smoking. DNA was isolated from samples of 20 healthy volunteers (six smokers and 14 non-smokers). The levels of DNA adducts were measured by 32P-postlabelling assay. In smokers the mean DNA adduct levels were 3.3 and 17.0 adducts/10(8) nucleotides in total white blood cells and nasal mucosa cells respectively. The corresponding values in non-smokers were 2.0 and 6.8 adducts/10(8) nucleotides. The mean adduct level was significantly higher in nasal mucosa cells than in total white blood cells both in smokers and non-smokers. The mean adduct levels in smokers' nasal mucosa cells were significantly higher than those in non- smokers. Thus the nasal mucosa cells constituted a sensitive tissue for the determination of cigarette smoking induced DNA adducts. Combining the sensitivity of the 32P-postlabelling assay with the specificity of the nasal mucosa to the airborne chemical exposures, the DNA adduct analysis from human nasal mucosa cells represents a method of choice in the assessment of exposure to airborne carcinogens.
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