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Bioconcentration, metabolism and alterations of thyroid hormones of Tris (1, 3-dichloro-2-propyl) phosphate (TDCPP) in Zebrafish
Update time:2018-10-18 16:55:00   【 Font: Large  Medium Small


Tris(1,3-dichloro-2-propyl) phosphate (TDCPP) is an organophosphate widely used as a flame retardant, and has frequently been detected in the environment and biota. The present study investigates the bioconcentration and metabolism of TDCPP in fish. Zebrafish embryos (from 2 h post-fertilization) were exposed to TDCPP (0, 4, 20 and 100 μg/L) for six months. Exposure to TDCPP significantly induced phase I metabolic enzymes 7-ethoxyresorufin O-deethylase (EROD) and 7-methoxyresorufin O-demethylase (MROD) in fish. The mRNA expression of genes related to Phase I and II metabolic enzymes, such as cyp1a1, cyp1b1, cyp1c1 and ugt1ab were also significantly upregulated. Exposure to TDCPP significantly reduced plasma thyroxine (T4) and 3,5,3’-triiodothyronine (T3) levels in females. Chemicals analysis indicated significant levels of TDCPP and its metabolite, bis (1,3-dichloro-2-propyl) phosphate (BDCPP), in the liver. The present study reveals that exposure to low concentrations of TDCPP can cause bioconcentration in fish, and TDCPP can be readily metabolized in liver.

TDCPP; Bioconcentration and metabolism; Zebrafish; Thyroid hormones


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Source:Environmental toxicology and pharmacology      by Xu T, Wang Q, Shi Q, et al.
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