Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Distribution of Urethane and Its Binding to DNA, RNA, and Protein in SENCAR and BALB/c Mice Following Oral and Dermal Administration.
Author Fossa, A. A. ; Baird, W. M. ; Carlson, G. P. ;
CORP Author Purdue Univ., Lafayette, IN.;Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1985
Report Number EPA-R-809744; EPA/600/J-85/401;
Stock Number PB86-200862
Additional Subjects Urethane ; Toxicology ; Deoxyribonucleic acids ; Ribonucleic acids ; Binding ; Mice ; Laboratory animals ; Proteins ; Metabolism ; Reprints ; Tumorigenesis
Library Call Number Additional Info Location Last
NTIS  PB86-200862 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 22p
In the initiation-promotion (I/P) assay for mouse skin tumorigenesis the initiating activity of various compounds is dependent upon both route of administration and strain of mouse tested. Urethane produces 3-fold more skin papillomas per mouse when administered orally than dermally in Sencar mice. To examine the biochemical basis for route and strain differences in the I/P assay, the binding of 14-C-urethane to DNA, RNA, and protein in mice susceptible (Sencar) and relatively resistant (Balb/c) to tumorigenesis by the protocol was determined. Binding of 14-C-urethane (0.062 mg/g body weight, 50 uCi/20 g body weight) to DNA, RNA and protein 6 hours after oral administration varied with tissue (liver > stomach > skin = lung) but not with strain. Binding to DNA in skin, lung and stomach, RNA in stomach and protein in stomach and liver after 48 hours was significantly higher in Sencar than in Balb/c. Dermal application of 14-C-urethane resulted in several fold higher binding to liver DNA of Sencar mice than Balb/c mice. Forty-eight hours after dermal application, significantly higher levels of 14-C-urethane remained bound to skin DNA, RNA and protein Balb/c mice, although all values were lower than at 6 hours after treatment.