The expression of CYP1A, vitellogenin and zona radiata proteins in Atlantic salmon (Salmo salar) after oral dosing with two commercial PBDE flame retardant mixtures: absence of short-term responses.
The short-term effects of the commercial PBDE flame retardant mixtures Penta-BDE and cta-BDE on the expression of cytochrome P450 1A (CYP1A), vitellogenin (Vtg) and zona radiata proteins (Zrp) were investigated in juvenile salmon (Salmo salar). For this purpose, groups of fish were dosed twice (oral intake at days I and 4) with 10 and 50 mg/kg body weight of both commercial mixtures. The fishes were sacrificed at day 7 (n = 5 for each group) and 14 (n = 6 for each group), and blood, liver, fillet, and brain were collected. Blanks and positive controls were also part of the experiment. The expressions of Vtg, Zrp, and CYPIA were measured with several techniques (EROD, ELISA, Western, Northern and Slot Blot). The values in the groups of fish treated with Penta-BDE or Octa-BDE did not significantly differ from the reference group for any of the parameters tested. In contrast, the positive control groups treated with estradiol-17beta for Vtg and Zrp expression, and beta-naphthoflavone for CYP1A expression did show a significant response, indicating the potential sensitivity of the fishes for the parameters measured. Since the results of the chemical analyses showed concentrations of a number of PBDE congeners in liver, fillet, and brain that were about three orders of magnitude above those of fish from the North Sea, it is concluded that the short-term toxicity of both commercial PBDE mixtures for these endpoints was low.
Boon
J P
JP
Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Biogeochemistry and Toxicology, Texel. boon@nioz.nl
van Zanden
J J
JJ
Lewis
W E
WE
Zegers
B N
BN
Goksøyr
A
A
Arukwe
A
A
D000284:Administration, Oral; D000818:Animals; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis*; D004527:Egg Proteins / Q000096:biosynthesis*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D004958:Estradiol / Q000096:biosynthesis; D005411:Flame Retardants / Q000009:adverse effects*; D005786:Gene Expression Regulation; D055768:Halogenated Diphenyl Ethers; D006842:Hydrocarbons, Brominated / Q000009:adverse effects*; D007814:Larva / Q000502:physiology; D010647:Phenyl Ethers / Q000009:adverse effects*; D011075:Polybrominated Biphenyls; D020317:Salmo salar / Q000502:physiology*; D014819:Vitellogenins / Q000096:biosynthesis*; D014874:Water Pollutants, Chemical / Q000009:adverse effects*
D004527:Egg Proteins; D005411:Flame Retardants; D055768:Halogenated Diphenyl Ethers; D006842:Hydrocarbons, Brominated; D010647:Phenyl Ethers; D011075:Polybrominated Biphenyls; D014819:Vitellogenins; D014874:Water Pollutants, Chemical; C423083:zona radiata protein, fish; D004958:Estradiol; C086401:pentabromodiphenyl ether; D019363:Cytochrome P-450 CYP1A1