ABSTRACT: 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 µg/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.
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.
Project description:Sublethal effects of the flame retardant intermediate hexachlorocyclopentadiene (HCCPD) on the gene expression and protein activity of Daphnia magna Reference sample is a composite of equal amounts of total RNA (500 ng each) from n=3 culture media controls and n=3 methanol controls
Project description:Sublethal effects of the flame retardant intermediate hexachlorocyclopentadiene (HCCPD) on the gene expression and protein activity of Daphnia magna Reference sample is a composite of equal amounts of total RNA (500 ng each) from n=3 culture media controls and n=3 methanol controls Two-condition experiment: controls (methanol and cell culture) and three sublethal doses of HCCPD (0.138 ug/L, 1.38 ug/L, 13.8 ug/L). Biological replicates: 3 replicates each group.
Project description:Tris(1,3-dichloro-2-propyl)phosphate is widely used in consumer products as a flame retardant. Humans are often exposed to this compound. However, the molecular mechanisms of the compound`s adverse effects are still unclear. We address the molecular and cellular mechanisms underlying tris(1,3-dichloro-2-propyl)phosphate effects on HeLa cells. Here RNA-Seq analysis was performed to identify distinct classes of up- or down-regulated genes and their connections to different metabolic pathways.
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.
Project description:Tricresyl Phosphate (TCP) is an organophosphate flame retardant currently on the market and used as a replacement for phased-out polybrominated diphenyl ethers. Toxicity information on this class of chemicals is inadequate. Herein, the NTP use short-term, in vivo transcriptomic studies to inform potential points of departure for TCP.
Project description:Isopropylated Phenol Phosphate (IPP) is an organophosphate flame retardant currently on the market and used as a replacement for phased-out polybrominated diphenyl ethers. Toxicity information on this class of chemicals is inadequate. Herein, the NTP use short-term, in vivo transcriptomic studies to inform potential points of departure for IPP.
Project description:Isodecyl Diphenyl Phosphate (IDDP) is an organophosphate flame retardant currently on the market and used as a replacement for phased-out polybrominated diphenyl ethers. Toxicity information on this class of chemicals is inadequate. Herein, the NTP use short-term, in vivo transcriptomic studies to inform potential points of departure for IDDP.
Project description:Triphenyl phosphate (TPHP) is an organophosphate flame retardant currently on the market and used as a replacement for phased-out polybrominated diphenyl ethers. Toxicity information on this class of chemicals is inadequate. Herein, the NTP use short-term, in vivo transcriptomic studies to inform potential points of departure for TPHP.
