Genotoxicity of ferric oxide nanoparticles in Raphanus sativus: Deciphering the role of signaling factors, oxidative stress and cell death

J Environ Sci (China). 2016 Sep:47:49-62. doi: 10.1016/j.jes.2015.12.037. Epub 2016 Apr 18.

Abstract

We have studied the genotoxic and apoptotic potential of ferric oxide nanoparticles (Fe2O3-NPs) in Raphanus sativus (radish). Fe2O3-NPs retarded the root length and seed germination in radish. Ultrathin sections of treated roots showed subcellular localization of Fe2O3-NPs, along with the appearance of damaged mitochondria and excessive vacuolization. Flow cytometric analysis of Fe2O3-NPs (1.0mg/mL) treated groups exhibited 219.5%, 161%, 120.4% and 161.4% increase in intracellular reactive oxygen species (ROS), mitochondrial membrane potential (ΔΨm), nitric oxide (NO) and Ca(2+) influx in radish protoplasts. A concentration dependent increase in the antioxidative enzymes glutathione (GSH), catalase (CAT), superoxide dismutase (SOD) and lipid peroxidation (LPO) has been recorded. Comet assay showed a concentration dependent increase in deoxyribonucleic acid (DNA) strand breaks in Fe2O3-NPs treated groups. Cell cycle analysis revealed 88.4% of cells in sub-G1 apoptotic phase, suggesting cell death in Fe2O3-NPs (2.0mg/mL) treated group. Taking together, the genotoxicity induced by Fe2O3-NPs highlights the importance of environmental risk associated with improper disposal of nanoparticles (NPs) and radish can serve as a good indicator for measuring the phytotoxicity of NPs grown in NP-polluted environment.

Keywords: Apoptosis; DNA damage; Ferric oxide nanoparticles; Nanotoxicity; Oxidative stress; Phytotoxicity.

MeSH terms

  • Catalase / metabolism
  • Cell Death
  • DNA Damage
  • Environmental Monitoring / methods
  • Environmental Pollutants / toxicity*
  • Ferric Compounds / toxicity*
  • Glutathione / metabolism
  • Lipid Peroxidation / drug effects
  • Metal Nanoparticles / toxicity*
  • Mutagenicity Tests
  • Mutagens / toxicity*
  • Oxidative Stress
  • Raphanus
  • Reactive Oxygen Species / metabolism
  • Superoxide Dismutase / metabolism

Substances

  • Environmental Pollutants
  • Ferric Compounds
  • Mutagens
  • Reactive Oxygen Species
  • ferric oxide
  • Catalase
  • Superoxide Dismutase
  • Glutathione