Unknown,Transcriptomics,Genomics,Proteomics

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Comparisons of toxicogenomic responses in zebrafish (Danio rerio) exposed to different sized AgNPs: The impact of size on global gene expression profiles

ABSTRACT: To investigate the patterns of global gene expression profiles modulated by the different sized AgNPs and to differentiate their modes of toxicity, zebrafish (Danio rerio) will be exposed to the AgNPs (50, and 150nm) and used for microarray analysis by Agilent Zebrafish Oligo Microarray system. 334 genes overlaped between AgNPs and Ag+ treatments in a total of 7,538 differential expressed genes. Immune response, antigen processing and presentation, response to estradiol stimulus and regulation of RNA metabolic process are most significant GO terms enriched in genes up regulated by four treatments. Neuroactive ligand-receptor interaction pathway was enriched among AgNP 50nm and AgNP 150nm activated genes, and specifically induced by AgNP 50nm include cell cycle and Toll-like receptor signaling pathways. The zebrafish larvae (72hpf) was exposed to AgNPs for 96hour. And then after total RNA extration from the each samples, the AgNPs related gene expression profiles identified using Agilent Zebrafish Oligo Microarray. Significant alterations in gene expression were found for all treatments and many of the gene pathways connected.

ORGANISM(S): Danio rerio

SUBMITTER: Jinjong Bong

PROVIDER: E-GEOD-50718 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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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 Âµg/L of AgNO3 or 70 Âµg/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. 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. FHM were obtained from Aquatic Biosystems (Fort Collins, CO), held in aerated dechlorinated tap water and fed three times daily with ZeiglerÂ® AquaTox Feed Gardners, PA, USA). Fathead minnow females were exposed to either 4 Âµg/L of AgNO3 or 70 Âµg/L of PVP-AgNPs (Luna Innovations, Blackburn, VA) for 96h at 24Â°C Â± 1 with a 90% water change at 48 hours. Microarray analyses were performed on liver and brain.

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Comparisons of toxicogenomic responses in zebrafish (Danio rerio) exposed to different sized AgNPs: The impact of size on global gene expression profiles

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