The Cellular and Genomic Response of Dopaminergic Neurons (N27) to Commericial “Capped” Nanosilver
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ABSTRACT:
ORGANISM(S): Rattus norvegicus
PROVIDER: GSE48087 | GEO | 2013/06/20
SECONDARY ACCESSION(S): PRJNA208894
REPOSITORIES: GEO
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Project description:Global gene expression indicated that N27 neurons exposed to each nanoAg material (1.0 ppm, 18 hr) responded primarily to PVP coated nanoAg of both sizes with affected pathways largely associated with mitochondrial dysfunction (PVP 75 nm nanoAg) and Nrf-2 mediated oxidative stress (PVP 10 nm nanoAg) pathways. N27 rat dopaminergic neurons were exposed to non-cytoxic (0.5-5.0 ppm) concentrations of nanoAg of different sizes (10 nm, 75 nm) and “cappings” (PVP, citrate).
2013-06-20 | E-GEOD-48087 | biostudies-arrayexpress
Project description:This study uses the RBEC4 cell model to examine if nanosilver of different sizes (10nm and 75nm) and cappings (citrate and polyvinylpyrrolidone(PVP)) affect its cellular permeability and genomic response. RBEC4 cells (95% confluent) were screeened for changes in gene expression after 18 hour exposure to 1.0 ppm of PVP or citrate coated nanosilver particles at 10 or 75 nanometer sizes. Analysis indicated that the cellular transcription profile alter by nanosilver 10nm+PVP was distinct from it 75nm counterpart and both sizes of citrate-coated particles.
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Project description:This study uses the RBEC4 cell model to examine if nanosilver of different sizes (10nm and 75nm) and cappings (citrate and polyvinylpyrrolidone(PVP)) affect its cellular permeability and genomic response.
2013-05-31 | GSE47543 | GEO
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Project description:Applications for silver nanomaterials in consumer products are rapidly expanding, creating an urgent need for toxicological examination of the exposure potential and ecological effects of silver nanoparticles (AgNPs). The integration of genomic techniques into environmental toxicology has presented new avenues to develop exposure biomarkers and investigate the mode of toxicity of novel chemicals. In the present study we used a 15k oligonucleotide microarray for Daphnia magna, a freshwater crustacean and common indicator species for toxicity, to differentiate between particle specific and ionic silver toxicity and to develop exposure biomarkers for citrate-coated and PVP-coated AgNPs. Gene expression profiles revealed that AgNO3 and AgNPs have distinct expression profiles suggesting different modes of toxicity. However, the gene expression profiles of the different coated AgNPs were similar revealing similarities in the cellular effects of these two particles. Major biological processes disrupted by the AgNPs include protein metabolism and signal transduction. In contrast, AgNO3 caused a downregulation of developmental processes, particularly in sensory development. Metal responsive and DNA damage repair genes were induced by the PVP AgNPs, but not the other treatments. In addition, two specific biomarkers were developed for the environmental detection of PVP AgNPs; although further verification under different environmental conditions is needed. We exposed Daphnia magna to the 1/10 LC50 and LC25 of citrate coated and PVP-coated Ag nanoparticles and Ag+ as AgNO3 for 24-h. For each exposure condition, we performed 6 replicate exposures with 5 individuals in each. All exposures were compared to a unexposed laboratory control.
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2013-11-01 | E-GEOD-46520 | biostudies-arrayexpress
Project description:Nanoparticles are compounds of emerging concern with largely unknown risks for human and ecological health. It is crucial to evaluate their potential biological impact to prevent unintended adverse effects on human health and the environment. We analyzed the transcriptional effects of polyvinylpyrrolidone-coated silver nanoparticles (PVP-AgNPs) and silver nitrate (AgNO3) on the fathead minnow (Pimephales promelas) to understand their potential toxicity and adverse outcomes. We also tested the feasibility of the fathead minnow as an alternative species to elucidate potential adverse effects on humans. Fathead minnow females were exposed to either 4 µg/L of AgNO3 or 70 µg/L of PVP-AgNPs for 96h. Microarray analyses were performed on liver and brain. Functional analysis identified potential toxicity pathways and molecular initiating events (MIEs) that were confirmed with functional assays. Data suggested that AgNO3 and PVP-AgNPs had both common and distinct transcriptional effects. The nanoparticles were linked to neurotoxicity and oxidative stress, and identified as a dopamine receptor antagonist. Silver nitrate was also identified as a potential neurotoxicant and was confirmed as adrenergic and cannabinoid receptors antagonist. While silver nitrate and PVP-AgNPs were both potential neurotoxicants, they appeared to act through different MIEs. Fathead minnow is a promising alternative species to elucidate potential adverse effects of relevance to human health.
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