Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Toxicity mechanisms of ZnO UV-filters used in sunscreens toward the model cyanobacteria Synechococcus elongatus PCC7942

ABSTRACT: Zinc oxide (ZnO) nanoparticles are commonly used in sunscreens for their UV-filtering properties. Their growing use can lead to their release into ecosystems, raising question about their toxicity. Effects of these engineered nanomaterials (ENMs) on cyanobacteria, which are important primary producers involved in many biogeochemical cycles, are unknown. In this study, we investigated by several complementary approaches the toxicological effects of two marketed ZnO-ENMs (coated and uncoated) on the model cyanobacteria Synechococcus elongatus PCC 7942. It was shown that despite the rapid adsorption of ENMs on cell surface, toxicity is mainly due to labile Zn released by ENMs. Zn dissipates cell membrane potential necessary for both photosynthesis and respiration, and induces oxidative stress leading to lipid peroxidation and DNA damages. It leads to global downregulation of photosystems, oxidative phosphorylation, and transcription/translation machineries. This also translates into significant decrease of intracellular ATP content and cell growth inhibition. However, there is no major loss of pigments and even rather an increase in exposed cells compared to controls. A proposed way to reduce the environmental impact of Zn would be the improvement of the coating stability to prevent solubility of ZnO-ENMs.

ORGANISM(S): Synechococcus elongatus PCC 7942 = FACHB-805

PROVIDER: GSE102914 | GEO | 2019/06/05

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Differential Gene Expression in Daphnia magna Suggests Distinct Modes of Action and Bioavailability for ZnO nanoparticles and Zn ions

Project description:Zinc Oxide nanoparticles (ZnO NPs) are being rapidly developed for use in consumer products, wastewater treatment and chemotherapy providing several possible routes for ZnO NP exposure to humans and aquatic organisms. Recent studies have shown that ZnO NPs undergo rapid dissolution to Zn+2, but the relative contribution of Zn+2 to ZnO NP bioavailability and toxicity is not clear. Gene expression profiling of D. magna exposed to ZnO NPs or ZnSO4 at equitoxic concentrations demonstrated that the particles cause toxicity through a distinct mechanism compared with Zn+2. D. magna were also exposed to a SiO NPs as a particle control at equimolar concentrations. The SiO NPs resulted in few differentially expressed genes and there was very little overlap between the genes affected by the ZnO NPs and the SiO NPs, suggesting that ZnO NPs cause a distinct pattern of differentially expressed genes. In the ZnO NP exposures, effects were observed to genes involved in cytoskeletal transport, cellular respiration and reproduction. Three biomarker genes including a multi-cystatin, ferritin and a C1q containing gene were confirmed as differentially expressed in a specific pattern by ZnO NP and provide a suite of biomarkers for identifying environmental exposure to ZnO NP and differentiating between NP and ionic exposure. We exposed Daphnia magna to the 1/10 LC50 and LC25 of ZnO nanoparticles and Zn++ as ZnSO4 for 24-h. For each exposure condition, we performed 3 exposures and 2 technical replicates (as dye swap) for each exposure (6 microarrays total). All exposures were compared to a unexposed laboratory control

2010-12-31 | E-GEOD-22051 | biostudies-arrayexpress

Differential Gene Expression in Daphnia magna Suggests Distinct Modes of Action and Bioavailability for ZnO nanoparticles and Zn ions

2010-12-31 | GSE22051 | GEO

Expression data from mouse liver tissue from SKH:QS mice treated with commercially available sunscreens containing ZnO or TiO2 nanoparticles, or no nanoparticles

2016-07-26 | GSE84818 | GEO

Synechococcus elongatus PCC 7942 = FACHB-805

Project description:Toxicity mechanisms of ZnO UV-filters used in sunscreens toward the model cyanobacteria Synechococcus elongatus PCC7942

| PRJNA399267 | ENA

Expression data from mouse liver tissue from SKH:QS mice treated with commercially available sunscreens containing ZnO or TiO2 nanoparticles, or no nanoparticles

Project description:ZnO and TiO2 nanoparticles can elicit a range of perturbed cell responses in vitro. Exposure to topically applied sunscreens containing ZnO or TiO2 particles may or may not elicit a biological effect in mice. We aimed to compare the biological responses of immune-competent hairless mice receiving topical applications of commercially available sunscreens with or without metal oxide nanoparticles, with the responses of mice receiving no sunscreen. Commercially available sunscreens containing ZnO nanoparticles, a mixture of TiO2 nanoparticles and organic UVR filters, or only organic UVR filters were applied to the backs of SKH:QS mice weekly over 36 weeks, with or without subsequent exposure to 29 kJ/m2 UVR. After 36 weeks and 30 treatments, mice were sacrificed and liver tissue was harvested for RNA isolation and whole genome transcriptional profiling, comparing the expression profiles of treated mice with untreated mice.

2016-07-26 | E-GEOD-84818 | biostudies-arrayexpress

Expression data from mouse liver tissue from SKH:QS mice treated with 68ZnO sunscreens

2013-09-11 | GSE46568 | GEO

Expression data from human olfactory neurosphere derived cells (hONS) established from adult donors treated with coated and uncoated ZnO nanoparticles

Project description:ZnO nanoparticles can elicit a range of cytotoxic responses in different cells in vitro that may reflect either Zn2+ dissolution or nanoparticle-specific effects. Coating the ZnO nanoparticles may mitigate their cytotoxicity. We aimed to capture whole genome transcriptional profiles (up and down regulated) at time-points associated with distinct cytotoxic responses in cells treated with two types of uncoated (Nanosun, Z-COTE) or two types of coated (HP1, MAX) ZnO nanoparticles, compared to untreated cells. hONS cells were incubated with 25ug/ml ZnO nanoparticles (uncoated: Nanosun and Z-COTE; coated: MAX, HP1) for 2h and 6h and their expression profiles were compared to time-matched untreated cells.

2013-09-11 | E-GEOD-45322 | biostudies-arrayexpress

Expression data from mouse liver tissue from SKH:QS mice treated with 68ZnO sunscreens

Project description:ZnO nanoparticles can elicit a range of perturbed cell responses in vitro. Exposure to topically applied sunscreens containing ZnO particles may or may not elicit a biological effect in mice. We aimed to determine whether exposure to topically applied ZnO particles manufactured as either microparticles or nanoparticles could elicit a biological response in liver tissue isolated from treated mice, compared to the sunscreen formulation only or untreated mice. Sunscreens containing 68ZnO microparticles, 68ZnO nanoparticles or no metal oxide particles at all (formulation only) were applied to the backs of SKH:QS mice six times over four days. On the fifth day mice were sacrificed and liver tissue was harvested for RNA isolation and whole genome transcriptional profiling, comparing the expression profiles of treated mice with untreated mice. Two separate experiments were conducted, one using virgin mice and the other using pregnant mice (~17d gestation)

2013-09-11 | E-GEOD-46568 | biostudies-arrayexpress

The effect of CuO nanoparticles on gene expression patterns in Daphnia magna

Project description:There is still a lot of contradiction on whether metal ions are solely responsible for the observed the toxicity of ZnO and CuO nanoparticles to aquatic species. While most tests have studied nanoparticle effects at organismal levels (e.g. mortality, reproduction), effects at suborganismal levels may clarify the role of metal ions, nanoparticles and nanoparticle aggregates. In this study, the effect of ZnO, CuO nanoparticles and zinc, copper salts was tested on the gene expression levels in Daphnia magna. D. magna was exposed during 96 hours to 10% immobilization concentrations of all chemicals, after which daphnids were sampled for a differential gene expression analysis using microarray. When comparing the nanoparticle exposed daphnids (ZnO or CuO) to the metal salt exposed daphnids (zinc or copper salt), the microarray results showed no significantly differentially expressed genes. These results indicate that the toxicity of the tested ZnO and CuO nanoparticles to D. magna caused is solely caused by toxic metal ions. 4 replicate exposures of ZnO nanoparticles, ZnCl2, Blank (for Zn); 4 replicate exposures of CuO nanoparticles, CuCl2.2H2O, Blank (for Cu); Individual reference design with swapped dyes for zinc (e.g. ZnO-REFZn; REFZn-bl) and copper exposure (e.g. CuO-REFCu; REFCu-bl); Zinc reference sample is a mixture of equal aliquots of ZnO nanoparticle, ZnCl2 and blank; Copper reference sample is a mixture of equal aliquots of CuO nanoparticle, CuCl2.2H2O and blank

2014-03-01 | E-GEOD-54738 | biostudies-arrayexpress

The effect of ZnO nanoparticles on gene expression patterns in Daphnia magna

2014-03-01 | E-GEOD-54736 | biostudies-arrayexpress