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Metabolism and DNA adduct formation are critical in cancer induction by NNK. The investigators goal is to understand whether the observed ethnic/racial differences in lung cancer incidence are due to variations in NNK metabolism. The investigators overall hypothesis is that cancer susceptibility relates to carcinogen dose and to the balance between carcinogen metabolic activation and detoxification. The investigators propose to test this hypothesis via investigation of potential differences in NNK metabolic activation and detoxification in African American and European American smokers.
Lung cancer is the most common cause of cancer death in the United States, with the annual number of cases estimated at 162,460 deaths per year. It is more prevalent in African Americans as compared to European Americans. Cigarette smoking causes up to 90% of lung cancer, being the major risk factor in both African Americans and European Americans.
Tobacco-specific nitrosamines (TSNA) are among the most significant carcinogens in tobacco products. Multiple international studies clearly document the occurrence of substantial amounts of these carcinogens in both unburned tobacco and tobacco smoke. One of the most prevalent of these compounds, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), is present in both unburned tobacco and cigarette smoke, and is a remarkably effective lung carcinogen in laboratory animals, inducing lung tumors in rodents independent of the route of administration. 4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), a metabolite of NNK, is also a pulmonary carcinogen. NNK has been classified by the International Agency for Research on Cancer as a Group 1 carcinogen (carcinogenic to humans). Consistent with this, 2 recent studies by our group have demonstrated that levels of NNAL in serum or urine are related to lung cancer in smokers.
Our primary aim is to conduct a comprehensive analysis of urinary biomarkers of NNK metabolic activation and detoxification in African American and European American smokers. We hypothesize that, after adjustment for smoking level, the relative contribution of the biomarkers of NNK metabolic activation to the total amount of NNK metabolites will be higher in African Americans as compared to European Americans. Our secondary aim is to measure in exfoliated oral mucosa cells of African American and European American smokers DNA adducts formed as a result of NNK metabolic activation. The results of these measurements will offer a direct measure of NNK-induced DNA damage in smokers, and will be critical to an understanding of the balance between the urinary excretion of NNK metabolites and the extent of NNK DNA binding. We hypothesize that African Americans will have in the DNA of their oral mucosa cells higher levels of NNK-derived DNA adducts as compared to European Americans. Finally, we will investigate the relationship between levels of NNK-derived DNA adducts measured in oral mucosa cells and the rates of repair of these adducts in cultured lymphocytes from our subjects. These measurements will allow us to evaluate more fully the role of variations in NNK metabolism in the observed differences in lung cancer risk between European American and African American smokers. We expect that that African Americans will have lower capacity to repair NNK-induced DNA damage as compared to European Americans, and this will correlate with higher levels of NNK-derived buccal DNA adducts.
Observational Model: Cohort, Time Perspective: Prospective
University of Minnesota
Not yet recruiting
National Institute on Drug Abuse (NIDA)
Published on BioPortfolio: 2014-08-27T03:12:23-0400
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Tumors or cancer of the LUNG.
Malignant neoplasm arising from the epithelium of the BRONCHI. It represents a large group of epithelial lung malignancies which can be divided into two clinical groups: SMALL CELL LUNG CANCER and NON-SMALL-CELL LUNG CARCINOMA.
Nuclear phosphoprotein encoded by the p53 gene (GENES, P53) whose normal function is to control CELL PROLIFERATION and APOPTOSIS. A mutant or absent p53 protein has been found in LEUKEMIA; OSTEOSARCOMA; LUNG CANCER; and COLORECTAL CANCER.
A heterogeneous aggregate of at least three distinct histological types of lung cancer, including SQUAMOUS CELL CARCINOMA; ADENOCARCINOMA; and LARGE CELL CARCINOMA. They are dealt with collectively because of their shared treatment strategy.
A form of highly malignant lung cancer that is composed of small ovoid cells (SMALL CELL CARCINOMA).
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. During DNA sequencing, the bases of a small fragment of DNA are sequentially identified from signals emitted as each fragment is re-synthesized from a ...
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