DNA damage as an intermediate biomarker in intervention studies

Area of Science:

• Biomarkers of Exposure and Disease
• Environmental Health Sciences
• Molecular Epidemiology

Background:

• DNA adducts serve as crucial biomarkers indicating exposure to chemical carcinogens from environmental, lifestyle, or occupational sources.
• Sensitive assays for measuring DNA damage in humans are vital for advancing intervention studies and understanding disease mechanisms.

Purpose of the Study:

• To evaluate the role of DNA adducts as markers of exposure to chemical carcinogens.
• To investigate the modulation of DNA adducts through antioxidant interventions.
• To summarize existing intervention studies on oxidative DNA damage and aromatic DNA adducts.

Main Methods:

• Utilizing enzyme-linked immunosorbent assay (ELISA) and quantitative immunohistochemistry for immunologic detection of DNA adducts.
• Measuring polycyclic aromatic hydrocarbon (PAH)-DNA adducts, 4-aminobiphenyl DNA adducts, and oxidative DNA damage (8-oxo-deoxyguanosine).
• Analyzing DNA adducts in blood mononuclear cells, oral cells, and bladder cells from subjects receiving antioxidants or placebo.

Main Results:

• Elevated polycyclic aromatic hydrocarbon (PAH)-DNA adducts were observed in foundry/coke oven workers, individuals with high air pollution exposure, and smokers.
• An inverse relationship between serum antioxidants and PAH-DNA adducts was found in smokers, supporting antioxidant intervention studies.
• Published intervention studies demonstrate that DNA adducts can be modulated by interventions.

Conclusions:

• DNA adducts are reliable indicators of exposure to various chemical carcinogens.
• Interventions, such as antioxidant supplementation, show potential in modulating DNA adduct levels.
• Measuring DNA adducts provides valuable mechanistic data for supporting larger-scale epidemiological and intervention studies.