Pretreatment with mixed-function oxidase inducers increases the sensitivity of the hepatocyte/DNA repair assay
✍ Scribed by J. G. Shaddock; R. H. Heflich; D. C. McMillan; J. A. Hinson; D. A. Casciano
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 752 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0893-6692
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✦ Synopsis
A recent National Toxicology Program evaluation indicates that the rat hepatocyte/DNA repair assay has a high false-negative rate and that it is insensitive to some genotoxic hepatocarcinogens as well as other species and organ-specific carcinogens. In this study, we examined whether the sensitivity of the hepatocyte/DNA repair assay might be increased through animal pretreatment with various hepatic mixed-function oxidose inducers, i.e., Aroclor 1254, phenobarbital, and 3,3',4,4'-tetrachloroazobenzene (TCAB). The effects on unscheduled DNA synthesis (UDS), a measure of DNA damage and repair, were studied in cultures exposed to known and/or potential carcinogens that had been evaluated as negative or questionable or that produced conflicting results with hepatocytes isolated from uninduced animals. 4,4'-Oxydianiline, 1 -nitropy-rene, and TCAB produced con-centration-dependent increases in UDS in hepatocytes from rats pretreated with Aralor 1254. 4,4'-Oxydianiline and TCAB also induced a dose-dependent increase in DNA repair in hepatocytes from rats pretreated with phenobarbital, whereas 1 -nitropyrene was negative. 4,4'-Methylenedianiline produced a marginal response, and 3,3',4,4'-tetrachloroazoxybenzene (TCAOB) was negative in Aroclor-and phenobarbital-induced hepatocytes; however, TCAOB, as well as TCAB, produced concentration-dependent increases in UDS in TCAB-induced hepatocytes. These data indicate that the limited sensitivity to chemical carcinogens displayed by the hepatocyte/DNA repair assay may be increased by using hepatocytes isolated from animals exposed to hepatic mixed-function oxidase inducers.