PMID: 2492209Feb 15, 1989Paper

Fate of 7,12-dimethylbenz(a)anthracene in the mouse mammary gland during initiation and promotion stages of carcinogenesis in vitro

Cancer Research
S K DasM R Banerjee

Abstract

Metabolic conversion and distribution of the products of 7,12-dimethylbenz(a)anthracene (DMBA) were analyzed in the mouse mammary cell transformation model in organ culture. In order to determine the levels of uptake of DMBA, the glands were exposed to the transforming dosage of the procarcinogen (7.8 microM, 20 microCi/ml) for 24 h, and the level of uptake was determined to be 8 x 10(4) cpm/mg of tissue. Subsequently, the glands were incubated in DMBA-free medium, and distribution of the radioactivity in DNA and in the acid-insoluble materials was measured. Data showed that, in addition to the 24-h DMBA treatment period, the initiation stage extends for another 3 h when the incubation is continued in DMBA-free medium. A saturation level of uptake of [3H]DMBA into the whole gland was observed at 12 h, while DMBA was continually metabolized with the products being bound to DNA and to the acid-insoluble fractions throughout the entire incubation period with or without DMBA. The three major adducts identified were anti-DMBA-3,4-diol-1,2-epoxide (DMBADE):deoxyguanosine, syn-DMBADE:deoxyadenosine, and anti-DMBADE:deoxyadenosine. Qualitatively the adduct profiles remained similar. However, with the additional 3-h incubation in DMBA-f...Continue Reading

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