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"Giovanni XXIII" Research Cancer Center, Institute of General Pathology [G. R., A. S., A. B., G. F., G. C., Q. Y., C. S., A. F., A. C.], and Institute of Hygiene [G. C.], Catholic University School of Medicine, 00168 Rome, Italy; Ufficio del Capo del Corpo Sanitario Aeronautico, 00185 Rome, Italy [V. L. G.]; and Division of Environmental Health Sciences, Columbia School of Public Health, New York, New York 10032 [R. M. S.]
Polycyclic aromatic hydrocarbon-DNA adducts were evaluated in oral cells from 98 healthy volunteers by an immunohistochemical method using a specific antiserum against benzo(a)pyrene-DNA adducts revealed by the immunoperoxidase reaction. Mean adduct content, determined as relative staining intensity by absorbance image analyzer, was significantly higher in the cells from tobacco smokers compared with nonsmokers (330 ± 98, n = 33 versus 286 ± 83, n = 64, respectively) with a P = 0.013 obtained by two-sample t test with equal variances. We found that in the smoker group, the PAH-DNA adduct content increases with the number of cigarettes. Thus, the relative staining intensity was 305 ± 105 in the group smoking 1–10 cigarettes/day (n = 16), 347 ± 77 in the 11–20 group (n = 14), and 386 ± 112 in the group smoking more than 20 cigarettes/day (n = 3; P = 0.03 by nonparametric test for trend). No significant association was detected between PAH-DNA adducts in oral cells and variables such as residential area, oral infections, alcohol or vitamin intake, grilled food consumption, and professional activity. This work confirms and extends previous data suggesting that this immunohistochemical method might be used as a valuable dosimeter of genotoxic damage in a carcinogen-exposed population, although further studies are needed to verify the applicability of the test in high-risk populations other than smokers.
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