Arylamine N-acetyltransferases (Nats) catalyze the acetylation of the extracyclic nitrogen of hydrazines and aromatic amines including the tobacco smoke carcinogen 4-aminobiphenyl (4AB). Two genes NAT I and NAT 2 each exhibit polymorphisms that result in variations in enzyme activities. Associations of NAT genes and susceptibility to smoking-related urinary bladder cancer have been reported. However, the involvement of one or both NAT genes, interactions between the two genes and genetic-environmental interactions are not fully understood. The overall goal is to investigate these relationships in genetically-defined mice. The hypothesis to be tested is that susceptibility to aromatic amine genotoxicity is associated with tissue specific expression of specific combinations of NAT I and NAT 2 genotypes.
The specific aims are 1) to identify variants of mouse Nat 1; 2) to create a controllable knockout of Nat I and Nat 2; 3) to over-express Nat I and/or Nat 2 in a particular tissue using tissue specific promoters in transgenic mice; 4) to evaluate Nat 1 and Nat 2 expression in transgenic and knockout mice and 5) to detect 4AB-DNA adducts in mice genetically defined at Nat I and/or Nat 2. The controllable knockout without hepatic Nat genes will be achieved using the Cre-loxP system to knockout the gene then crossing the mice with the """"""""floxed"""""""" knockout to albumin promoter Cre transgenic mice. Transgenic animals over-expressing either or both Nat genes will also be developed. An albumin promoter will allow targeting of over-expression to liver. Mice differing in Nat genes will be exposed to 4AB and DNA adducts measured in target and non-target tissue using a monoclonal antibody and immunohistochemistry. These studies will show whether 4AB genotoxicity is modulated by Nat expression. The results will provide insight into genetic regulation of susceptibility to a carcinogen found in tobacco smoke.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
5R01ES010047-03
Application #
6382328
Study Section
Alcohol and Toxicology Subcommittee 4 (ALTX)
Program Officer
Packenham, Joan P
Project Start
1999-09-01
Project End
2003-08-31
Budget Start
2001-09-01
Budget End
2002-08-31
Support Year
3
Fiscal Year
2001
Total Cost
$216,771
Indirect Cost
Name
University of Arizona
Department
Pharmacology
Type
Schools of Pharmacy
DUNS #
City
Tucson
State
AZ
Country
United States
Zip Code
85721
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