Proteomic responses to silver nanoparticles vary with the fungal ecotype

Barros, Diana Cláudia Martins Costa; Pradhan, Arunava; Pascoal, Cláudia; Cássio, Fernanda

doi:10.1016/j.scitotenv.2019.135385

Cited by 19 publications

(34 citation statements)

References 46 publications

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“…The same is applicable to Ag-NPs where some studies show a similar toxicity mechanism to Ag + through the disruption of Na regulation (Kwok et al, 2016), while others show that due to low dissolution of metal ions from the Ag-NPs, the toxicity is attributed mainly to their nano form (Batista et al, 2017;Clark et al, 2018). The latter hypothesis is supported by results from aquatic microbes, where proteomic profiles of microbes exposed to Ag-NPs and Ag + largely differ, suggesting distinct cellular targets and mechanisms of toxicity (Barros et al, 2020). In our study, dissolution of Ag ions from Ag-NPs in the medium without organisms was low and was even lower in the presence of organisms, reaching concentrations near to Ag + EC 50 values.…”

Section: Discussionmentioning

confidence: 93%

Effects of metal nanoparticles on freshwater rotifers may persist across generations

2020

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Nanotechnology has become one of the fastest growing industries in the current century because nanomaterials (NMs) are present in an ever-expanding range of consumer products increasing the chance of their release into natural environments. In this study, the impacts of two metal nanoparticles (Ag-NPs and CuO-NPs) and their equivalent ionic forms (Ag + and Cu 2+ ) were assessed on the lentic freshwater rotifer Brachionus calyciflorus and on its ability to adapt and recover through generations. In our study, Ag-NPs and CuO-NPs inhibited the rotifer population growth rate and caused mortality at low concentrations (< 100 μg L − 1 ). Ag-NPs and CuO-NPs decreased in the medium when organisms were present (48 h exposure: 51.1 % and 66.9 %, respectively), similarly Ag + and Cu 2+ also decreased from medium in presence of the organisms (48 h: 35.2 % and 47.3 %, respectively); although the metal concentrations removed from the medium were higher for nanoparticles than metal ions, metal ions showed higher effects then their respective nanoparticle forms. Rotifer populations exposed for 4 generations to the toxicants were able to recover the population growth rate, but some rotifers showed developmental delay and inability to reproduce even after the removal of the toxicants. Intracellular accumulation of reactive oxygen species as well as plasma membrane damage were found in the rotifers at concentrations corresponding to EC 10 (Ag-NPs = 1.7 μg L -1 , Ag + = 4.5 μg L -1 , CuO-NPs = 46.9 μg L -1 , Cu 2+ = 35 μg L -1 ) of the population growth rate. Our results showed, for the first time, that effects of metal nanoparticles and metal ions on rotifer populations may persist along several generations. This should be taken into account when assessing risks of metal nanoparticles in freshwaters.

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Section: Discussionmentioning

confidence: 93%

Effects of metal nanoparticles on freshwater rotifers may persist across generations

2020

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“…The activities of antioxidant enzymes from the ascorbate-glutathione cycle play active role in cellular defense against reactive oxygen species (ROS), preventing the cellular damage and maintaining the cellular redox homeostasis (Ayer et al 2014); hence our results reinforce the role of these enzymes as early warning biomarkers of oxidative stress induced by EMNs (nano-CuO: Pradhan et el. 2015b; nano-Ag: Barros et al 2019a;Barros et al 2019b). In our study, metal oxide nanoparticles significantly induced the activities of CAT, GPx and GST in microbial decomposer communities at ≥ 0.5 mg L -1 .…”

Section: Discussionmentioning

confidence: 99%

“…In our study, the effects of ENMs on feeding rate via contaminated leaves were more pronounced than via contaminated water, which was probably due to the decreased quality and palatability of the chestnut leaves after 21 days of exposure to the ENMs. The exposure to ENMs might have led to high adsorption and accumulation of metals and/or nanoparticles to leaves (Pradhan et al 2012) and aquatic fungi (Barros et al 2019b). Indeed, an earlier study on trophic transfer of nano-TiO2 in freshwaters demonstrated that, comparing to aqueous exposure, the dietary intake could constitute the main route of ENM exposure to higher trophic levels (Zhu et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs?

Pradhan

Fernandes

Martins

et al. 2021

Science of The Total Environment

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“…9.2), such as warming, drought events, eutrophication, persistent and emergent contaminants. Some data already exist on the role of fungal ecotypes to maintain ecological functions under stress (e.g., metal stress, Fernandes et al, 2011) and the biological mechanisms underlying stress responses based on proteomics (e.g., metal nanoparticles, Barros et al, 2020). These data suggest that microbial populations and communities can adapt to stressors following the pollution-induced community tolerance (Tlili et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Linking Microbial Decomposer Diversity to Plant Litter Decomposition and Associated Processes in Streams

Pascoal

Fernandes

Seena

et al. 2021

The Ecology of Plant Litter Decomposition in Stream Ecosystems

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The physiology, biochemistry and diversity of aquatic microbial decomposers have been largely investigated in low-order streams. However, some aspects still need further attention to better ascertain how microbial decomposer diversity can ensure ecosystem processes and services, particularly under the challenges posed by global environmental change. Aquatic microbial decomposers play a key role in processing plant litter in streams by degrading the most recalcitrant compounds and facilitating nutrient and energy transfer to higher trophic levels. Among microbial decomposers, fungi, particularly aquatic hyphomycetes, play a fundamental role at the early stages of plant litter decomposition, while the relevance of bacteria increases at the late stage of the decomposition. High-throughput sequencing and metagenomic techniques open new avenues towards a more comprehensive understanding of microbial decomposer ecology. This chapter provides a general overview

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Proteomic responses to silver nanoparticles vary with the fungal ecotype

Cited by 19 publications

References 46 publications

Effects of metal nanoparticles on freshwater rotifers may persist across generations

Effects of metal nanoparticles on freshwater rotifers may persist across generations

Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs?

Linking Microbial Decomposer Diversity to Plant Litter Decomposition and Associated Processes in Streams

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