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Toxicity of differently sized and charged silver nanoparticles to yeast Saccharomyces cerevisiae BY4741: a nano-biointeraction perspective.
Nanotoxicology. 2019 10; 13(8):1041-1059.N

Abstract

In the current study, we evaluated the modulatory effects of size and surface coating/charge of AgNPs on their toxicity to a unicellular yeast Saccharomyces cerevisiae BY4741 - a fungal model. For that, the toxicity of a set of 10 and 80 nm citrate-coated (negatively charged) and branched polyethylenimine (bPEI) coated (positively charged) AgNPs was evaluated in parallel with AgNO3 as ionic control. Yeast cells were exposed to different concentrations of studied compounds in deionized water for 24 h at 30 °C and evaluated for the viability by the post-exposure colony-forming ability. Particle-cell interactions were assessed by SEM, TEM and confocal laser scanning microscopy (CLSM) in the reflection mode. AgNPs toxicity to yeast was size and charge-dependent: 24-h IC50 values ranged from 0.04 (10nAg-bPEI) up to 8.3 mg Ag/L (80nAg-Cit). 10 nm AgNPs were 5-27 times more toxic than 80 nm AgNPs and bPEI-AgNPs 8-44 times more toxic than citrate-AgNPs. SEM and TEM visualization showed that bPEI-AgNPs but not citrate-AgNPs adsorbed onto the yeast cell's surface. However, according to CLSM all the studied AgNPs, whatever the size and coating, ended up within the yeast cell. Toxicity of citrate-AgNPs was largely explained by the dissolved Ag ions but the bPEI-AgNPs showed mainly particle-driven effects leading to the cellular internalization and/or to more pronounced dissolution of AgNPs in the close vicinity of the cell wall. Therefore, the size, and especially the coating/charge of AgNPs can be efficiently used for the design of new more efficient antifungals.

Authors+Show Affiliations

Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics , Tallinn , Estonia.Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics , Tallinn , Estonia.Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics , Tallinn , Estonia.Department of Earth and Environmental Sciences, Research Centre POLARIS, University of Milano-Bicocca , Milano , Italy.Department of Earth and Environmental Sciences, Research Centre POLARIS, University of Milano-Bicocca , Milano , Italy.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31107118

Citation

Kasemets, Kaja, et al. "Toxicity of Differently Sized and Charged Silver Nanoparticles to Yeast Saccharomyces Cerevisiae BY4741: a Nano-biointeraction Perspective." Nanotoxicology, vol. 13, no. 8, 2019, pp. 1041-1059.
Kasemets K, Käosaar S, Vija H, et al. Toxicity of differently sized and charged silver nanoparticles to yeast Saccharomyces cerevisiae BY4741: a nano-biointeraction perspective. Nanotoxicology. 2019;13(8):1041-1059.
Kasemets, K., Käosaar, S., Vija, H., Fascio, U., & Mantecca, P. (2019). Toxicity of differently sized and charged silver nanoparticles to yeast Saccharomyces cerevisiae BY4741: a nano-biointeraction perspective. Nanotoxicology, 13(8), 1041-1059. https://doi.org/10.1080/17435390.2019.1621401
Kasemets K, et al. Toxicity of Differently Sized and Charged Silver Nanoparticles to Yeast Saccharomyces Cerevisiae BY4741: a Nano-biointeraction Perspective. Nanotoxicology. 2019;13(8):1041-1059. PubMed PMID: 31107118.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Toxicity of differently sized and charged silver nanoparticles to yeast Saccharomyces cerevisiae BY4741: a nano-biointeraction perspective. AU - Kasemets,Kaja, AU - Käosaar,Sandra, AU - Vija,Heiki, AU - Fascio,Umberto, AU - Mantecca,Paride, Y1 - 2019/06/20/ PY - 2019/5/21/pubmed PY - 2020/4/22/medline PY - 2019/5/21/entrez KW - Silver nanoparticles KW - cell structure KW - confocal and electron microscopy KW - toxicity SP - 1041 EP - 1059 JF - Nanotoxicology JO - Nanotoxicology VL - 13 IS - 8 N2 - In the current study, we evaluated the modulatory effects of size and surface coating/charge of AgNPs on their toxicity to a unicellular yeast Saccharomyces cerevisiae BY4741 - a fungal model. For that, the toxicity of a set of 10 and 80 nm citrate-coated (negatively charged) and branched polyethylenimine (bPEI) coated (positively charged) AgNPs was evaluated in parallel with AgNO3 as ionic control. Yeast cells were exposed to different concentrations of studied compounds in deionized water for 24 h at 30 °C and evaluated for the viability by the post-exposure colony-forming ability. Particle-cell interactions were assessed by SEM, TEM and confocal laser scanning microscopy (CLSM) in the reflection mode. AgNPs toxicity to yeast was size and charge-dependent: 24-h IC50 values ranged from 0.04 (10nAg-bPEI) up to 8.3 mg Ag/L (80nAg-Cit). 10 nm AgNPs were 5-27 times more toxic than 80 nm AgNPs and bPEI-AgNPs 8-44 times more toxic than citrate-AgNPs. SEM and TEM visualization showed that bPEI-AgNPs but not citrate-AgNPs adsorbed onto the yeast cell's surface. However, according to CLSM all the studied AgNPs, whatever the size and coating, ended up within the yeast cell. Toxicity of citrate-AgNPs was largely explained by the dissolved Ag ions but the bPEI-AgNPs showed mainly particle-driven effects leading to the cellular internalization and/or to more pronounced dissolution of AgNPs in the close vicinity of the cell wall. Therefore, the size, and especially the coating/charge of AgNPs can be efficiently used for the design of new more efficient antifungals. SN - 1743-5404 UR - https://www.unboundmedicine.com/medline/citation/31107118/Toxicity_of_differently_sized_and_charged_silver_nanoparticles_to_yeast_Saccharomyces_cerevisiae_BY4741:_a_nano_biointeraction_perspective_ L2 - https://www.tandfonline.com/doi/full/10.1080/17435390.2019.1621401 DB - PRIME DP - Unbound Medicine ER -