FORMATION OF 7-HYDROXYMETHYL-12-METHYLBENZ(A)ANTHRACENE-DNA ADDUCTS FROM 7,12-DIMETHYLBENZ(A)ANTHRACENE IN MOUSE EPIDERMIS

  • 1 January 1983
    • journal article
    • research article
    • Vol. 43  (9) , 4221-4226
Abstract
The formation of DNA adducts from [3H]-7-hydroxymethyl-12-methylbenz(a)anthracene (7-OHM-12-MBA) and [3H]-7,12-dimethylbenz(a)anthracene (DMBA) in the epidermis of Sencar mice was analyzed. Comparison of Sephadex LH-20 chromatographic profiles of DNA samples isolated from mice treated with DMBA or 7-OHM-12-MBA suggested that the DMBA-treated animals contained DNA adduct(s) derived from the further metabolism of 7-OHM-12-MBA. Further analysis of DNA samples from DMBA-treated mice by high-pressure liquid chromatography demonstrated the presence of 5 DNA adducts which were chromatographically indistinguishable from the DNA adducts formed in 7-OHM-12-MBA-treated mice. Epidermal homogenates were utilized to catalyze the covalent binding of [3H]DMBA and [3H]-7-OHM-12-MBA to calf thymus DNA in vitro. Under conditions of limiting concentrations of [3H]DMBA, the majority of the DNA adducts formed chromatographed in regions where 7-OHM-12-MBA-DNA adducts eluted. A major DMBA-DNA adduct formed in this in vitro system eluted with the same retention time as did the major 7-OHM-12-MBA-DNA adduct formed in mouse skin in vivo. These results when coupled with the in vivo data suggest that 7-OHM-12-MBA is an intermediate for at least some of the binding of DMBA to epidermal DNA in Sencar mice.

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