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Induction of DNA breakage and suppression of DNA synthesis by the OH radical generated in a Fenton-like reaction.

The effect of the OH radical, generated in a Fenton-like reaction, on DNA structure and function was studied in a monkey kidney cell line (Vero). DNA single strand breaks were detected following exposure to 10- 100 microM concentrations of H2O2 on ice. These breaks were repaired very rapidly, and addition of the poly (ADP-ribose) transferase inhibitor, 3-aminobenzamide, resulted in an accumulation of breaks. DNA synthesis was inhibited at concentrations as high as 1- 30 mM, this effect also being reversible in approximately 60 min. 3-aminobenzamide did not affect the rate of DNA synthesis inhibition by H2O2.