Relationship between BDE 209 metabolites and thyroid hormone levels in rainbow trout (Oncorhynchus mykiss).
Decabromodiphenyl ether (BDE 209), the primary component in a commonly used flame retardants, has recently been shown to be metabolized by organisms. In the present study, juvenile rainbow trout (Oncorhynchus mykiss) were exposed to BDE 209 at five nominal gradient concentrations from 50 to 1000 ng/g wet weight for 21 days via a single intraperitoneal injection. Then the liver, kidney and blood samples were collected to analyze for its debrominated, hydroxylated and methoxylated metabolites. The relationships between levels of BDE 209 metabolites in different tissues and thyroid hormone (TH) levels in plasma were evaluated. The results showed that BDE 209 could be metabolized into debrominated BDEs, methoxylated BDEs (MeO-BDEs) and hydroxylated BDEs (OH-BDEs). Levels of these three metabolites were tissue-dependent. The TH levels, including total thyroxine (TT(4)), free thyroxine (FT(4)), total triiodothyronine (TT(3)) and free triiodothyronine (FT(3)) in plasma, were significantly affected by BDE 209 metabolism. However, only FT(4) levels showed a negative correlation with MeO-BDE and OH-BDE metabolites, among which the correlation between FT(4) and OH-BDEs was the most significant.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Chenglian
C
Feng
Yiping
Y
Xu
Gaofeng
G
Zhao
Jinmiao
J
Zha
Fengchang
F
Wu
Zijian
Z
Wang
D000818:Animals; D055768:Halogenated Diphenyl Ethers / Q000097:blood / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity*; D007668:Kidney / Q000737:chemistry; D008099:Liver / Q000737:chemistry; D017686:Oncorhynchus mykiss / Q000378:metabolism / Q000502:physiology*; D013963:Thyroid Hormones / Q000097:blood; D014874:Water Pollutants, Chemical / Q000097:blood / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity*
D055768:Halogenated Diphenyl Ethers; D013963:Thyroid Hormones; D014874:Water Pollutants, Chemical; C010902:decabromobiphenyl ether