Content of 8-hydroxy-2-deoxyguanosine in steroid receptor-positive and receptor-negative breast cancer cells.

摘要

The content of DNA damage marker 8-hydroxy-2-deoxyguanosine in 16 receptor-negative and 18 receptor-positive human breast neoplasms was measured by immunohistochemical methods. Positive staining was revealed in 81.3 and 50.0% samples of groups 1 and 2, respectively. The effect of arylhydrocarbon receptor agonist beta-naphthoflavone on the content of 8-hydroxy-2-deoxyguanosine and number of estrogen and progesterone receptors was evaluated in MCF-7 breast cancer cells. The degree of genotoxic damage significantly increased 1 h after combined treatment with estradiol and beta-naphthoflavone (in contrast to individual treatment) and remained practically unchanged in the follow-up period. According to the estrogen effect-switching phenomenon, genotoxic damage can contribute to the development of R(-)-breast cancer.