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Gene transcription, metabolite and lipid profiling in eco-indicator daphnia magna indicate diverse mechanisms of toxicity by legacy and emerging flame-retardants.

ABSTRACT: The use of chemical flame-retardants (FR) in consumer products has steadily increased over the last 30 years. Toxicity data exist for legacy FRs such as pentabromodiphenyl ether (pentaBDE), but less is known about effects of new formulations. To address this issue, the toxicity of seven FR chemicals and formulations was assessed on the freshwater crustacean Daphnia magna. Acute 48-h nominal LC50 values for penta- and octabromodiphenyl ether (pentaBDE, octaBDE), Firemaster 550 (FM550), Firemaster BZ-54 (BZ54), bis(2-ethylhexyl) tetrabromophthalate (BEH-TEBP), triphenyl phosphate (TPhP), and nonbrominated BEH-TEBP analog bis(2-ethylhexyl) phthalate (BEHP) ranged from 0.058 mg/L (pentaBDE) to 3.96 mg/L (octaBDE). mRNA expression, (1)H NMR-based metabolomic and lipidomic profiling at 1/10 LC50 revealed distinct patterns of molecular response for each exposure, suggesting pentaPBDE affects transcription and translation, octaBDE and BEH-TEBP affect glycosphingolipid biosynthesis and BZ54 affects Wnt and Hedgehog signal pathways as well as glycosaminoglycan degradation. Brominated components of FM550 (i.e., BZ54) were significantly higher in Daphnia after 48 h following 1/10 LC50 exposure. FM550 elicited significant mRNA changes at five concentrations across a range from 1/10^6 LC50 to 1/2 LC50. Analyses suggest FM550 impairs nutrient utilization or uptake in Daphnia.

ORGANISM(S): Daphnia magna

PROVIDER: GSE74736 | GEO | 2015/11/06

SECONDARY ACCESSION(S): PRJNA301365

REPOSITORIES: GEO

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Gene transcription, metabolite and lipid profiling in eco-indicator daphnia magna indicate diverse mechanisms of toxicity by legacy and emerging flame-retardants.

Project description:The use of chemical flame-retardants (FR) in consumer products has steadily increased over the last 30 years. Toxicity data exist for legacy FRs such as pentabromodiphenyl ether (pentaBDE), but less is known about effects of new formulations. To address this issue, the toxicity of seven FR chemicals and formulations was assessed on the freshwater crustacean Daphnia magna. Acute 48-h nominal LC50 values for penta- and octabromodiphenyl ether (pentaBDE, octaBDE), Firemaster 550 (FM550), Firemaster BZ-54 (BZ54), bis(2-ethylhexyl) tetrabromophthalate (BEH-TEBP), triphenyl phosphate (TPhP), and nonbrominated BEH-TEBP analog bis(2-ethylhexyl) phthalate (BEHP) ranged from 0.058 mg/L (pentaBDE) to 3.96 mg/L (octaBDE). mRNA expression, (1)H NMR-based metabolomic and lipidomic profiling at 1/10 LC50 revealed distinct patterns of molecular response for each exposure, suggesting pentaPBDE affects transcription and translation, octaBDE and BEH-TEBP affect glycosphingolipid biosynthesis and BZ54 affects Wnt and Hedgehog signal pathways as well as glycosaminoglycan degradation. Brominated components of FM550 (i.e., BZ54) were significantly higher in Daphnia after 48 h following 1/10 LC50 exposure. FM550 elicited significant mRNA changes at five concentrations across a range from 1/10^6 LC50 to 1/2 LC50. Analyses suggest FM550 impairs nutrient utilization or uptake in Daphnia. Seven flame retardant formulations and equal volume solvent (DMSO) controls for each; four exposed and three or four biological replicates per condition.

2015-11-06 | E-GEOD-74736 | biostudies-arrayexpress

Daphnia magna

Project description:1/10 LC50 metal exposures to Daphnia magna

| PRJNA95571 | ENA

Gene expression profiling in Daphnia magna, Part III: Uncovering Biomarkers for Metal and ORC exposures

Project description:To determine toxicant specific effects of Ordnance Related Compound (ORC) exposure we performed microarray hybridizations with RNA isolated from Daphnia magna following different ORC exposures at the 1/10 LC50. The gene expression profiles revealed toxicant specific gene expression profiles allowed for the identification of specific biomarkers of exposure. Keywords: ecotoxicogenomic exposure study We exposed Daphnia magna the 1/10 LC50 of different Ordnance Related Compounds (Cu, Zn, Pb, WO4, RDX, TNT, 2-ADNT, 2-ADNT, TNB, DNB, 2,4-DNT, and 2,6-DNT) for 24 hours. For each exposure condition, we performed 3 exposures and 2 technical replicates (as dye swap) for each exposure (6 microarrays total, except TNT and Cu). All exposures were compared to a unexposed laboratory control (MHRW media).

2010-05-18 | E-GEOD-13169 | biostudies-arrayexpress

Hepatic transcriptomic alterations for bis(2-ethylhexyl) tetrabromophthalate (TBPH) after 5-day exposure in rats

Project description:To identify liver transcripts differentially expressed due to treatment with bis(2-ethylhexyl) tetrabromophthalate (TBPH), we collected RNA from male Harlan Sprague Dawley rats exposed to 0, 0.07, 0.71, 7.06, 70.6 or 706 mg/kg TBPH, 5 days after exposure for animals 7 weeks of age. These samples were interrogated with the Affymetrix Rat Genome 230 2.0 GeneChip array. A total of 0,0,0,0, and 0 gene transcripts were differentially expressed due to TBPH treatment after exposure to 0.07, 0.71, 7.06, 70.6 or 706 mg/kg TBPH (false discovery rate (FDR) < 0.05).

2020-07-15 | GSE153365 | GEO

Gene expression profiling in Daphnia magna, Part III: Uncovering Biomarkers for Metal and ORC exposures

2008-10-16 | GSE13169 | GEO

Evaluation of chronic sublethal effects effects of the organophosphate flame retardant Tris(2-butoxyethyl)phosphate (TBEP) using Daphni magna transcriptomic response

Project description:The aim of this study was to measure chronic sublethal effects of the flame retardant Tris(2-butoxyethyl)phosphate (TBEP) on gene expression, associated protein activity and life-history endpoints (reproduction, development) in the freshwater crustacean Daphnia magna. We exposed <24h old D. magna neonates for 21 days to culture medium (control) and to 3 sublethal doses of TBEP: 14.7, 147 and 1470 M-BM-5g/L. Exposure doses were chosen from 48h acute toxicity testing and represent 1/10000, 1/1000 and 1/100 of the LC50, respectively. Each condition (control and the 3 different doses) were performed on 3 independant biological replicates, with 10 individuals each. We used a custom 15000 sequences D. magna microarray to measure transcriptional effect of each of the TBEP doses in comparison to unexposed controls. We exposed <24h old Daphnia magna to culture medium (unexposed controls) and 3 sublethal doses of TBEP (14.7M-BM-5g/L, 147M-BM-5g/L and 1470M-BM-5g/L) for 21 days. We used 3 biological replicates of 10 individuals for each condition.

2014-02-19 | E-GEOD-55132 | biostudies-arrayexpress

Hepatic transcriptomic alterations for tetrabromobisphenol A-bis(2,3-dibromopropyl ether) (TBBPA-DBPE) after 5-day exposure in rats

Project description:To identify liver transcripts differentially expressed due to treatment with tetrabromobisphenol A-bis(2,3-dibromopropyl ether) (TBBPA-DBPE), we collected RNA from male Harlan Sprague Dawley rats exposed to 0, 0.1, 0.94, 9.4, 94.3 or 943 mg/kg TBBPA.DBPE, 5 days after exposure for animals 7 weeks of age. These samples were interrogated with the Affymetrix Rat Genome 230 2.0 GeneChip array. A total of 0,0,0,0,0, and 0 gene transcripts were differentially expressed due to TBBPA.DBPE treatment after exposure to 0.1, 0.94, 9.4, 94.3 or 943 mg/kg TBBPA.DBPE (false discovery rate (FDR) < 0.05).

2020-07-15 | GSE153363 | GEO

Testicular dysgenesis syndrome and long-lasting epigenetic silencing of mouse sperm genes involved in the reproductive system after prenatal exposure to DEHP

Project description:Prenatal exposure to 300 mg/kg/day of bis(2-ethylhexyl)phthalate (D300) was administered to pregnant mice during embryonic days 9th to 19th, inducing a Testicular Dysgenesis Syndrome (TDS), observed in 100 days old F1 derived C57BL/6J males. A transcriptomic analysis was performed from spermatozoa produced by D300 mice compared with CTL. We used an adapted RNAseq method able to quantify all RNAs molecules independently of the 5’ and 3’ modifications.

2017-01-09 | GSE86837 | GEO

Gene expression profiles of Daphnia magna exposed to Cd at the 1/10 LC50

Project description:Cadmium (Cd) is a toxic metal causing sublethal and chronic effects in crustaceans. Omic technologies offer unprecedented opportunities to better understand modes of toxicity by providing a holistic view of the molecular changes underlying physiological disruption. We sought to use gene expression and metabolomic analyses to reveal the processes leading to chronic Cd toxicity in the indicator species, Daphnia magna, after a 24-h sublethal exposure (18 ug/L, corresponding to 1/10 LC50). We first confirmed that metabolites can be detected and identified in small volumes (~3-6 ul) of D. magna hemolymph using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and NMR spectroscopy. We then compared the altered metabolite levels from a mass spectrometry metabolomics study to differentially expressed genes identified by a D. magna 44k oligonucleotide microarray. Metabolomics identified several essential amino acids, nucleotides and fatty acids as decreased in D. magna hemolymph following Cd exposure. Transcriptional changes included decreased levels of digestive enzymes and increased expression of genes related to embryonic development. The integration of metabolomic and transcriptomic profiles, as well as incorporation of results from previous studies, has enabled construction of a conceptual model detailing how sublethal Cd disrupts energy reserves and reproduction resulting in chronic toxicity. Daphnia magna were exposed to 18 micrograms/L Cadmium sulfate for 24 hours. RNA was extracted and hybridized to a custom Daphnia magna microarray to determine genes differentially expressed by the treatment. Two treament experiment:Unexposed and Cd treatment, 6 replicates for each condition

2010-12-31 | E-GEOD-20218 | biostudies-arrayexpress

Sphingobium sp. SYK-6 treated with several carbon sources versus SEMP

Project description:Transcriptional profile of RNA extracted from Sphingobium sp. SYK-6 treated with 10 mM pinoresinol (PR), 10 mM acetovanillone (AV), 10 mM phenylcoumarane (PC), 10 mM vanillate (VA), 10 mM vanillin (VN), 10 mM protocatechuate (PCA), 10 mM fellulate (FA), 10 mM 5,5'- dehydrodivanillate (DDVA), 10 mM 1,2‐bis(4‐hydroxy‐3‐methoxyphehyl)‐1,3‐propanediol (B1), 10 mM syringate (SA), 10 mM guaiacylglycerol‐β‐guaiacyl ether (GGE) comparing RNA extracted from SYK-6 treated with SEMP (10 mM sucrose, 10 mM glutamate, 0.34 mM methionine, and 10 mM proline).

2019-07-23 | GSE134094 | GEO

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