DNA polymerase beta imbalance increases apoptosis and mutagenesis induced by oxidative stress

FEBS Lett. 2001 Sep 14;505(2):229-32. doi: 10.1016/s0014-5793(01)02834-4.


Oxidative stress has been proposed to be one of the major causes leading to the accumulation of mutation that is associated with the initiation and progression of cancers. Elevated expression of DNA polymerase beta, an event found in many human tumors, has been shown to generate a mutator phenotype. Here, we demonstrated that overexpression of DNA polymerase beta strengthens the mutagenicity of oxidative damages, concomitantly with a higher cellular sensitivity and increased apoptosis. Deregulated expression of DNA polymerase beta could represent a predisposition factor for mutagenic effects of oxidative stress and thus have implication in the generation and/or evolution of cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis*
  • CHO Cells
  • Cricetinae
  • DNA Polymerase beta / metabolism*
  • Dose-Response Relationship, Drug
  • Hydrogen Peroxide / metabolism
  • Mutagenesis*
  • Mutation
  • Oxidative Stress*
  • Oxygen / metabolism
  • Phenotype
  • Reactive Oxygen Species / metabolism
  • Time Factors
  • Transfection


  • Reactive Oxygen Species
  • Hydrogen Peroxide
  • DNA Polymerase beta
  • Oxygen