The objective of this study is to investigate the relationship between DNA adducts and micronuclei in the skin of mice treated with a model polycyclic aromatic hydrocarbon and an aromatic amine (Benzo(a)pyrene BaP, 4-Aminobiphenyl 4-ABP). Both these compounds are significant occupational and environmental pollutants.
The specific aims will involve the following: 1. Determine the major DNA adducts formed in mouse skin by topical application of BaP and 4-ABP. This will be accomplished by using 32P- postlabeling techniques. 2. Determine chromosomal damage in mouse skin, as measured by micronuclei frequencies. A monolayer of cells, from exposed and control animals will be grown on cover slips/microscope slides. Approximately 1000 micronuclei will be scored/slide. 3. Establish dose response relationships between DNA adducts and micronuclei frequencies using standard statistical procedures. 4. Evaluate the mechanisms of clastogenicity using cytokinesis-blocked (i.e. binucleated cells. In addition, centromere specific antibodies will be used. This study will be the first to determine the interactions between DNA adducts and micronuclei in the skin, a target organ for many occupational carcinogens. The use of a skin specific carcinogen, BaP, and a carcinogen 4-ABP which does not affect the skin will allow us to investigate whether genetic lesions are formed at lower levels by 4ABP or whether the 4-ABP adducts are formed and subsequently repaired. This design will also allow us to test the hypothesis that it is specific metabolism which is responsible for aromatic amine carcinogenicity.

Agency
National Institute of Health (NIH)
Institute
National Institute for Occupational Safety and Health (NIOSH)
Type
Small Research Grants (R03)
Project #
1R03OH002880-01
Application #
3431237
Study Section
Safety and Occupational Health Study Section (SOH)
Project Start
1991-09-30
Project End
1993-09-29
Budget Start
1991-09-30
Budget End
1992-09-29
Support Year
1
Fiscal Year
1991
Total Cost
Indirect Cost
Name
University of Cincinnati
Department
Type
Schools of Medicine
DUNS #
City
Cincinnati
State
OH
Country
United States
Zip Code
45221