Article (Scientific journals)
Environmental factors affecting thyroid function of wild sea bass (Dicentrarchus labrax) from European coasts
Schnitzler, Joseph; Klaren, Peter; Bouquegneau, Jean-Marie et al.
2012In Chemosphere
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Keywords :
Dicentrarchus labrax; Thyroid hormone metabolism; Persistent organic pollutants
Abstract :
[en] 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 (T4) and triiodothyronine (T3) 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 T4–T3 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.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Schnitzler, Joseph ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Klaren, Peter
Bouquegneau, Jean-Marie ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Das, Krishna  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Language :
English
Title :
Environmental factors affecting thyroid function of wild sea bass (Dicentrarchus labrax) from European coasts
Publication date :
2012
Journal title :
Chemosphere
ISSN :
0045-6535
eISSN :
1879-1298
Publisher :
Elsevier Science, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
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