title: Environmental factors affecting thyroid function of wild sea bass (Dicentrarchuslabrax) from European coasts.
abstract: Thyroid functional status of wild fish in relation with the contamination of their environment deserves further investigation. We here applied a multi-level approach of thyroid function assessment in 87 wild sea bass collected near several estuaries: namely the Scheldt, the Seine, the Loire, the Charente and the Gironde. Thyroxine (T(4)) and triiodothyronine (T(3)) concentrations in muscle were analyzed by radioimmunoassay. The activity of hepatic enzymes involved in extrathyroidal pathways of thyroid hormone metabolism, viz. deiodination, glucuronidation and sulfatation were analyzed. Last, follicle diameter and epithelial cell heights were measured. We observed changes that are predicted to lead to an increased conversion of T(4)-T(3) and lowered thyroid hormone excretion. The changes in the metabolic pathways of thyroid hormones can be interpreted as a pathway to maintain thyroid hormone homeostasis. From all compounds tested, the higher chlorinated PCBs seemed to be the most implicated in this perturbation.
authors.affiliation: Mare Centre, Laboratory for Oceanology B6c, Liège University, Liège, Belgium. joseph.schnitzler@ulg.ac.be
authors.forename: Joseph G
authors.initials: JG
authors.lastname: Schnitzler
authors.forename: Peter H M
authors.initials: PH
authors.lastname: Klaren
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Bouquegneau
authors.forename: Krishna
authors.initials: K
authors.lastname: Das
mesh_terms: D000818:Animals; D001492:Bass / Q000378:metabolism*; D005060:Europe; D007453:Iodide Peroxidase / Q000378:metabolism; D008099:Liver / Q000201:enzymology / Q000378:metabolism; D015999:Multivariate Analysis; D018482:Muscle, Skeletal / Q000378:metabolism; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000633:toxicity*; D011863:Radioimmunoassay; D015238:Sulfotransferases / Q000378:metabolism; D013961:Thyroid Gland / Q000187:drug effects / Q000378:metabolism*; D013974:Thyroxine / Q000378:metabolism; D036401:Toxicity Tests, Chronic; D014284:Triiodothyronine / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D014284:Triiodothyronine; D011078:Polychlorinated Biphenyls; D007453:Iodide Peroxidase; D015238:Sulfotransferases; D013974:Thyroxine