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Absence of genotoxicity following pulmonary exposure to metal oxides of copper, tin, aluminum, zinc, and titanium in mice

  • 0National Research Centre for the Working Environment, Copenhagen Ø, Denmark.
Environmental and Molecular Mutagenesis +

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October 12, 2024

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October 12, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Occupational exposure to metal oxide nanomaterials showed no significant genotoxicity in mice, except for a minor increase in liver DNA damage with copper oxide (CuO). This study provides crucial data for workplace risk assessment of these nanoparticles.

Area Of Science

  • Environmental Health
  • Nanotoxicology
  • Occupational Safety

Background

  • Inhalation of metal oxide nanoparticles in workplaces necessitates understanding their hazardous effects for risk assessment.
  • Previous studies suggest potential genotoxicity of nanomaterials, requiring further investigation.

Purpose Of The Study

  • To investigate the genotoxic potential of various metal oxide nanomaterials following pulmonary exposure.
  • To assess reactive oxygen species (ROS) production and DNA damage in mice exposed to occupationally relevant doses.

Main Methods

  • Mice were intratracheally instilled with copper oxide (CuO), tin oxide (SnO2), aluminum oxide (Al2O3), zinc oxide (ZnO), titanium dioxide (TiO2), and carbon black at specific doses.
  • Acellular and intracellular ROS production were measured.
  • Genotoxicity, specifically DNA strand breaks, was assessed using the comet assay in lung and liver tissues at 1 and 28 days post-exposure.

Main Results

  • Copper oxide (CuO) and carbon black were potent ROS generators, followed by titanium dioxide (TiO2).
  • Aluminum oxide (Al2O3), zinc oxide (ZnO), and tin oxide (SnO2) showed low ROS generation.
  • No significant genotoxicity was observed in lung or liver tissues, except for a slight increase in liver DNA damage at the highest CuO dose.

Conclusions

  • Occupationally relevant doses of the tested metal oxide nanomaterials did not induce significant genotoxicity in mice.
  • The findings contribute valuable data for the risk assessment of metal oxide nanoparticles in occupational settings.
  • CuO demonstrated the highest potential for ROS generation and a minor genotoxic effect in the liver.

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