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Effects of organophosphate flame retardants on Atlantic cod liver cells

ABSTRACT: Effects of organophosphate flame retardants on Atlantic cod liver cells

PROVIDER: PRJNA407769 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6048600.fastq.gz	Fastqsanger.gz
	SRR6048610.fastq.gz	Fastqsanger.gz
	SRR6048620.fastq.gz	Fastqsanger.gz
	SRR6048601.fastq.gz	Fastqsanger.gz
	SRR6048611.fastq.gz	Fastqsanger.gz

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Effects of organophosphate flame retardants on Atlantic cod liver cells

Project description:Organophosphorous flame retardants (PFRs) were first reported in the late 1970, and today they account for approximately 20 % of the total use of flame retardants in Europe. PFRs are found ubiquitously in the environment, including remote areas stretching from the Arctic to the Antarctic. Generally, similar levels of PFRs is observed between Arctic and more rural areas. The toxicity of PFRs varies depending on their chemical structure. The World Health Organization have reported LC50 values for mammals and aquatic organisms with high variation from 4.2 to 180 mg/L or 707 to 4700 mg/kg body weight, depending on substance and test species. However, little is known about the toxicity and physiological effects of PFRs to fish, particularly in the Arctic species. Hence, the objective of this study is to determine the effects of PFR exposure on hepatic gene expression patterns in Atlantic cod (Gadus morhua) using liver explants in vitro. Liver explants were exposed to 2-Ethylhexyl diphenyl phosphate (EHDPP), tris(2-chloroisopropyl)phosphate (TCPP), and a mixture of both EHDPP and TCPP for 0, 24 and 48 hours. Samples were analyzed for gene expresson profiling using RNAseq. RNAsequening results suggest that exposure to PFRs differentially expressed genes involved in xenobiotic metabolism. We did not observe any chemical-specific effects on gene expression patterns. However, temporal changes in gene expression were observed. Most of the differentially expressed genes (DE) in 24h exposed samples are related in xenobiotic metabolism, whereas in 48h samples DE genes belong to diverse physiological processes.

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Project description:In the North Sea and adjacent North Atlantic coastal areas fish experience relatively high levels of persistent organic pollutants. The aim of this study is to compare the mode of actions of environmentally relevant concentrations of halogenated compounds and their mixtures in Atlantic cod. Juvenile male cod were fed mixtures of chlorinated (PCBs, DDT analogs, chlordane, lindane and toxaphene), brominated (PBDEs) and fluorinated (Perfluorooctanesulfonate/PFOS) compounds for one month. One group received a mixture of all three compounds. Transcriptome analysis of liver samples was performed to identify the main affected pathways. Accumulated levels of chemicals in cod liver reflected concentrations found in wild fish. Pathway analysis revealed that the treatment effects by each of the three groups of chemicals (chlorinated, brominated and fluorinated) converged on activation of the unfolded protein response (UPR). The results of our transcriptomics analysis suggest that the UPR pathway is a sensitive common target of halogenated organic environmental pollutants

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