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Molecular and Cellular Biochemistry

, Volume 234, Issue 1, pp 317–326 | Cite as

Soluble metals as well as the insoluble particle fraction are involved in cellular DNA damage induced by particulate matter

  • Ad M. Knaapen
  • Tingming Shi
  • Paul J.A. Borm
  • Roel P.F. Schins
Article

Abstract

Exposure to ambient particulate matter has been reported to be associated with increased rates of lung cancer. Previously we showed that total suspended particulate matter (PM) induces oxidative DNA damage in epithelial lung cells. The aim of the present study was to further investigate the mechanism of PM-induced DNA damage, in which soluble iron-mediated hydroxyl radical (OH) formation is thought to play a crucial role. Using electron spin resonance (ESR) we showed that PM suspensions as well as their particle-free, water-soluble fractions can generate OH in the presence of hydrogen peroxide (H2O2), an effect which was abrogated by both deferoxamine and catalase. In addition, PM was also found to induce the OH-specific DNA lesion 8-hydroxydeoxyguanosine (8-OHdG) in the presence of H2O2 as assessed by dot-blot analysis of calf thymus DNA using an 8-OHdG antibody. In human alveolar epithelial cells (A549), both PM suspensions and the particle-free soluble fraction elicited formation of DNA strand breaks (comet-assay). Unlike the acellular DNA assays, in epithelial cells the DNA-damaging capacity of the particle suspensions appeared to be stronger than that of their corresponding particle-free filtrates. In conclusion, our findings demonstrate that the water-soluble fraction of PM elicits DNA damage via transition metal-dependent OH formation, implicating an important role of H2O2. Moreover, our data indicate that direct 'particle' effects contribute to the genotoxic hazard of ambient particulate matter in lung target cells.

DNA strand breaks epithelial lung cells Fenton reaction hydrogen peroxide hydroxyl radicals particulate matter 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Ad M. Knaapen
    • 1
  • Tingming Shi
    • 1
  • Paul J.A. Borm
    • 1
  • Roel P.F. Schins
    • 1
  1. 1.Particle Research CoreResearch Institute for Environmental Health (IUF)DüsseldorfGermany

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