Industrial compounds such as methylene chloride, dibromoethane, and butadiene are known carcinogens in rodents. These compounds are activated by conjugation with glutathione (GSH) and cause mutations in DNA by forming DNA adducts. The intermediates of this reaction are believed to be glutathione conjugates formed by glutathione S- transferases (GSTs). This proposal compares the ability of rat, human, and bacterial GSTs to form mutagenic DNA adducts with GSH conjugates in the presence of different haloalkanes and butadiene diepoxide. The proposed research will examine the genotoxicity of these compounds, the mechanism of activation by GST, the stability of the compounds, and the DNA adducts formed. The Ames test will be used to determine the mutagenicity of the various compounds when GST is being expressed in Salmonella typhuurium. Recombinant GSTs from human, rat and bacterial sources will be purified and used for in vitro assays to determine the mechanism of DNA adduct formation. Chemically synthesized intermediates of the GSH activation reaction will be tested for stability under various conditions and oligonucleotides will be used to test the formation of DNA adducts.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32CA080376-03
Application #
6377025
Study Section
Special Emphasis Panel (ZRG2-SSS-1 (01))
Program Officer
Lohrey, Nancy
Project Start
2001-03-03
Project End
Budget Start
2001-03-03
Budget End
2001-07-31
Support Year
3
Fiscal Year
2001
Total Cost
$17,812
Indirect Cost
Name
Vanderbilt University Medical Center
Department
Biochemistry
Type
Schools of Medicine
DUNS #
004413456
City
Nashville
State
TN
Country
United States
Zip Code
37212
Guengerich, F Peter; McCormick, W Andrew; Wheeler, James B (2003) Analysis of the kinetic mechanism of haloalkane conjugation by mammalian theta-class glutathione transferases. Chem Res Toxicol 16:1493-9
Wheeler, J B; Stourman, N V; Armstrong, R N et al. (2001) Conjugation of haloalkanes by bacterial and mammalian glutathione transferases: mono- and vicinal dihaloethanes. Chem Res Toxicol 14:1107-17
Wheeler, J B; Stourman, N V; Thier, R et al. (2001) Conjugation of haloalkanes by bacterial and mammalian glutathione transferases: mono- and dihalomethanes. Chem Res Toxicol 14:1118-27