Proteomic evaluation of citrate-coated silver nanoparticles toxicity in Daphnia magna
Loading...
Files
Accepted Version
Date
2014-01
Authors
Rainville, Louis-Charles
Carolan, Darragh
Varela, Ana Coelho
Doyle, Hugh
Sheehan, David
Journal Title
Journal ISSN
Volume Title
Publisher
The Royal Society of Chemistry
Published Version
Abstract
Recent decades have seen a strong increase in the promise and uses of nanotechnology. This is correlated with their growing release in the environment and there is concern that nanomaterials may endanger ecosystems. Silver nanoparticles (AgNPs) have some of the most varied applications, making their release into the environment unavoidable. In order to assess their potential toxicity in aquatic environments, the acute toxicity of citrate-coated AgNPs to Daphnia magna was measured and compared to that of AgNO3. AgNPs were found to be ten times less toxic by mass than silver ions, and most of this toxicity was removed by ultracentrifuging. At the protein level, the two forms of silver had different impacts. Both increased protein thiol content, while only AgNP increased carbonyl levels. In 2DE of samples labelled for carbonyls, no feature was significantly affected by both compounds, indicating different modes of toxicity. Identified proteins showed functional overlap between the two compounds: vitellogenins (vtg) were present in most features identified, indicating their role as a general stress sensor. In addition to vtg, hemoglobin levels were increased by the AgNP exposure while 14-3-3 protein (a regulatory protein) carbonylation levels were reduced by AgNO3. Overall, this study confirms the previously observed lower acute toxicity of AgNPs, while demonstrating that the toxicity of both forms of silver follow somewhat different biologic pathways, potentially leading to different interactions with natural compounds or pollutants in the aquatic environment.
Description
Keywords
Analytical toxicology of nanoparticles , Nanoparticle toxicity , Silver nitrate toxicity , Citrate-coated AgNP
Citation
RAINVILLE, L.-C., CAROLAN, D., VARELA, A. C., DOYLE, H. & SHEEHAN, D. 2014. Proteomic evaluation of citrate-coated silver nanoparticles toxicity in Daphnia magna. Analyst, 139, 1678-1686. doi: 10.1039/C3AN02160B
Link to publisher’s version
Copyright
© The Royal Society of Chemistry 2014. Reproduced by permission of The Royal Society of Chemistry.