Reference : Metallothioneins in Marine Mammals
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Metallothioneins in Marine Mammals
Das, Krishna mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie >]
Debacker, Virginie mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie >]
Bouquegneau, Jean-Marie mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie - Doyen de la Faculté des Sciences >]
Cellular and Molecular Biology
Yes (verified by ORBi)
[en] metallothioneins ; marine mammals ; metals
[en] Metallothioneins (MTs) have been detected in livers and kidneys of 10 marine mammals species (Pinnipeds and Odontocetes). Characterization of renal MTs of striped dolphin has shown that the protein has two isoforms (MT-1 and MT-2) with a molecular weight estimated around 6,800. MT concentrations also vary widely in marine mammals tissues (from 58 to 1,200 microg x g(-1) ww) underlying the numerous parameters involved: physiological status, pregnancy, age, diet. The participation of this protein in metal detoxification has been investigated since high levels of cadmium (Cd) and mercury (Hg) have been measured in livers and kidneys of marine mammals. It has been suggested that those animals can mitigate at least in part, the toxic effects of Cd and Hg through binding to MTs. The percentage of the cytosolic Cd bound to MTs can reach almost 100%. On the contrary, the percentage of hepatic and renal Hg bound to MT is very low (generally less than 10%) and this metal is mainly associated with selenium (HgSe) under a detoxified form in the insoluble fraction of the tissues. MTs appear to play a minor role in the binding and detoxification of Hg by marine mammals. On the contrary, close and dynamic interactions occur between Cd and MTs. Cytosolic MTs appear as a potential short term way of detoxification of Cd accumulated from diet. Long-term detoxification would imply a sequestration of the metal under a precipitated form (e.g. in lysosomes).
Centre Interfacultaire de Recherches en Océanologie - MARE
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Service public fédéral de Programmation Police scientifique ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals ; Students ; General public

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