Primary cultures of RTE cells are exposed to carcinogens on Day 1, then morphologically altered epithelial foci are scored at Day 30. Tracheal epithelial cells are isolated from 8 to 12 weeks old male Fisher 344 rats and plated on collagen coated dishes. Initial cytotoxicity tests with the test chemopreventive agent are used to select appropriate concentration ranges for use in the transformation-inhibition assay. From the initial cytotoxicity test, the highest concentration which permits a CFE of 80% or greater compared to control is determined. This concentration and four half- log lower concentrations are included in the chemopreventive test assays. The attached cells are exposed to: media alone, solvent alone, benzo(a)pyrene alone, benzo(a)pyrene plus retinoic acid (or other positive control), or benzo(a)pyrene plus chemopreventive agent. At Day 2 the benzo(a)pyrene is removed and exposure to the chemopreventive agent, retinoic acid (or other positive control), or solvent continued. At 5-7 days three dishes per group are fixed and stained for cytotoxicity determination. At Day 30 all remaining cultures are fixed, stained, and morphologically altered foci scored. The transformation frequency of the various groups are determined. There are 25 chemopreventive agents to be evaluated by this assay.

Agency
National Institute of Health (NIH)
Institute
Division of Cancer Prevention And Control (NCI)
Type
Research and Development Contracts (N01)
Project #
N01CN085044-001
Application #
2893918
Study Section
Project Start
1998-06-30
Project End
1999-09-30
Budget Start
1998-11-05
Budget End
1999-09-30
Support Year
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Alion Science and Technology Corp
Department
Type
DUNS #
119162332
City
Durham
State
NC
Country
United States
Zip Code
27713