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Toxicity Study of Zinc Oxide Nanoparticles in Cell Culture and in Drosophila melanogaster
Published on: September 19, 2019
Nano-CeO2 exhibits adverse effects at environmental relevant concentrations
Haifeng Zhang1, Xiao He, Zhiyong Zhang
1Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Key Laboratory of Nuclear Analytical Techniques, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, China.
Environmental Science & Technology
|March 25, 2011
Summary
Ceria nanoparticles (nano-CeO(2)) cause oxidative stress and shorten the lifespan of Caenorhabditis elegans, even at extremely low environmental concentrations. This study highlights the critical need for nanotoxicology research at relevant exposure levels.
Area of Science:
- Environmental Science
- Toxicology
- Nanotechnology
Background:
- Widespread applications of cerium oxide nanoparticles (nano-CeO(2)) raise concerns about their environmental and human health impacts.
- Nanoparticle toxicity assessments often overlook environmentally relevant concentrations.
Purpose of the Study:
- To investigate the in vivo toxic effects of nano-CeO(2) on Caenorhabditis elegans (C. elegans) at environmentally relevant concentrations (1 nM to 100 nM).
- To explore the underlying mechanisms of nano-CeO(2) toxicity.
Main Methods:
- Exposure of C. elegans to varying concentrations of 8.5 nm nano-CeO(2).
- Assessment of reactive oxygen species (ROS) accumulation and oxidative damage.
- Evaluation of lifespan changes in exposed nematodes.
- In vitro studies to determine the role of ROS catalysis in nano-CeO(2) toxicity.
Main Results:
- Nano-CeO(2) exposure led to increased ROS accumulation and oxidative damage in C. elegans.
- A significant decrease in mean nematode lifespan was observed, with a 12% reduction at 1 nM nano-CeO(2).
- In vitro results suggest nano-CeO(2)'s ability to catalyze ROS contributes to its toxicity.
Conclusions:
- Nano-CeO(2) exhibits adverse effects on C. elegans at very low, environmentally relevant concentrations.
- This is the first study demonstrating nanoparticle toxicity at the nanomolar level.
- Emphasizes the necessity of nanotoxicological studies using environmentally relevant concentrations to assess nanoparticle risks.
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