Lévay G, Bodell W J
Brain Tumor Research Center of the Department of Neurological Surgery, School of Medicine, University of California, San Francisco 94143-0806, USA.
Biochem Biophys Res Commun. 1996 May 6;222(1):44-9. doi: 10.1006/bbrc.1996.0695.
We have investigated the influence of peroxides on DNA adduct formation in HL-60 cells treated with polyphenolic metabolites of benzene. Treatment of HL-60 cells with 50 microM hydroquinone (HQ), 500 microM catechol (CAT) or 200 microM 1,2,4-benzenetriol (BT) resulted in adduct levels of 0.27, 0.21 and 0.21 x 10(-7), respectively. Addition of 50-250 microM H2O2 or 250 microM cumene hydroperoxide to HL-60 cells increased DNA adduct formation 2.7-10-fold following treatment with HQ or CAT but had no effect on adduct formation by BT. Treatment of HL-60 cells with the combinations of HQ plus either BT or phorbol myristate acetate (PMA) potentiated DNA adduct formation by 2.5-4-fold. Significant elevations of cellular H2O2 levels occurred after treatment of HL-60 cells with either PMA, CAT or BT. These results indicate that cellular levels of H2O2 regulate the peroxidase dependent activation of benzene metabolites to form DNA adducts.
