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Influence of genetic susceptibility on the urinary excretion of 8-hydroxydeoxyguanosine of firefighters

Title
Influence of genetic susceptibility on the urinary excretion of 8-hydroxydeoxyguanosine of firefighters
Authors
Hong Y.-C.Park H.-S.Ha E.-H.
Ewha Authors
하은희
SCOPUS Author ID
하은희scopus
Issue Date
2000
Journal Title
Occupational and Environmental Medicine
ISSN
1351-0711JCR Link
Citation
vol. 57, no. 6, pp. 370 - 375
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Objectives - Oxidative DNA damage has been implicated in carcinogenesis. The DNA damage can be assessed from the urinary excretion of the DNA-repair product 8-hydroxydeoxyguanosine (8-OH-dG). The factors were investigated that influenced the excretion of urinary 8-OH-dG in 78 firefighters. Methods - 53 Out of 78 firefighters were exposed to fire within 5 days of the study and 25 were not. 8-OH-dG was measured by ELISA and the distribution of the genotypes of CYP1A1, CYP2E1, GSTM1, and GSTT1 was measured by polymerase chain reaction. Results - The homozygous wild type frequencies of CYP1A1 MspI, CYP1A1 ileval, CYP2E1, GSTM1, and GSTT1 were 31.5%, 56.2%, 60.3%, 50.7%, and 53.4%, respectively. The geometric mean of urinary 8-OH-dG was 14.1 ng/mg creatinine in more active firefighters and 12.3 ng/mg creatinine in non-exposed and less active subjects. Significantly increased concentrations of urinary 8-OH-dG were found to be associated with cigarette smoking, and 14% of the variation of 8-OH-dG was explained by cigarettes smoked per day. The CYP1A1 MspI, CYP1A1 ile-val, GSTM1, and GSTT1 genetic polymorphisms were not found to be significantly associated with the urinary excretion of 8-OH-dG. However, the subjects carrying the CYP2E1 mutant type excreted higher concentrations of 8-OH-dG and there was a marginally significant interaction of GSTT1 with firefighting activity. Multiple regression analysis confirmed that smoking was the strongest predictor of excretion of 8-OH-dG. Age, body mass index, and firefighting activity were not significant predictive factors for urinary 8-OH-dG. Conclusion - Smoking and CYP2E1 gene polymorphism may be important factors in carcinogenesis and the GSTT1 positive genotype may be a genetic susceptibility factor in firefighters who are exposed regularly to various chemical carcinogens.
DOI
10.1136/oem.57.6.370
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의학전문대학원 > 의학과 > Journal papers
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