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Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans

Publication ,  Journal Article
Meyer, JN; Lord, CA; Yang, XY; Turner, EA; Badireddy, AR; Marinakos, S; Chilkoti, A; Wiesner, MR; Auffan, M
Published in: Aquatic Toxicol
2010

Silver nanoparticles (AgNPs) are frequently used as antimicrobials. While the mechanism(s) by which AgNPs are toxic are unclear, their increasing use raises the concern that release into the environment could lead to environmental toxicity. We characterized the physicochemical behavior, uptake, toxicity (growth inhibition), and mechanism of toxicity of three AgNPs with different sizes and polyvinylpyrrolidone (PVP) or citrate coatings to the nematode Caenorhabditis elegans. We used wild-type (N2) C. elegans and strains expected to be sensitive to oxidative stress (nth-1, sod-2 and mev-1), genotoxins (xpa-1 and nth-1), and metals (mtl-2). Using traditional and novel analytical methods, we observed significant aggregation and extra-organismal dissolution of silver, organismal uptake and, in one case, transgenerational transfer of AgNPs. We also observed growth inhibition by all tested AgNPs at concentrations in the low mg/L levels. A metallothionein-deficient (mtl-2) strain was the only mutant tested that exhibited consistently greater AgNP sensitivity than wild-type. Although all tested AgNPs were internalized (passed cell membranes) in C. elegans, at least part of the toxicity observed was mediated by ionic silver. Finally, we describe a modified growth assay that permits differentiation between direct growth-inhibitory effects and indirect inhibition mediated by toxicity to the food source.

Duke Scholars

Published In

Aquatic Toxicol

Publication Date

2010

Volume

100

Start / End Page

140 / 150

Related Subject Headings

  • Toxicology
  • Silver
  • Povidone
  • Potassium
  • Oxidative Stress
  • Metal Nanoparticles
  • Environmental Pollutants
  • Caenorhabditis elegans
  • Anti-Infective Agents
  • Animals
 

Citation

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Chicago
ICMJE
MLA
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Meyer, J. N., Lord, C. A., Yang, X. Y., Turner, E. A., Badireddy, A. R., Marinakos, S., … Auffan, M. (2010). Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans. Aquatic Toxicol, 100, 140–150.
Meyer, J. N., C. A. Lord, X. Y. Yang, E. A. Turner, A. R. Badireddy, S. Marinakos, A. Chilkoti, M. R. Wiesner, and M. Auffan. “Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans.” Aquatic Toxicol 100 (2010): 140–50.
Meyer JN, Lord CA, Yang XY, Turner EA, Badireddy AR, Marinakos S, et al. Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans. Aquatic Toxicol. 2010;100:140–50.
Meyer, J. N., et al. “Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans.” Aquatic Toxicol, vol. 100, 2010, pp. 140–50.
Meyer JN, Lord CA, Yang XY, Turner EA, Badireddy AR, Marinakos S, Chilkoti A, Wiesner MR, Auffan M. Intracellular uptake and associated toxicity of silver nanoparticles in Caenorhabditis elegans. Aquatic Toxicol. 2010;100:140–150.

Published In

Aquatic Toxicol

Publication Date

2010

Volume

100

Start / End Page

140 / 150

Related Subject Headings

  • Toxicology
  • Silver
  • Povidone
  • Potassium
  • Oxidative Stress
  • Metal Nanoparticles
  • Environmental Pollutants
  • Caenorhabditis elegans
  • Anti-Infective Agents
  • Animals