Metallothionein response to cadmium and zinc exposures compared in two freshwater bivalves, Dreissena polymorpha and Corbicula fluminea |
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Authors: | Véronique Marie Patrice Gonzalez Magalie Baudrimont Jean-Paul Bourdineaud Alain Boudou |
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Institution: | (1) Laboratoire d’Ecophysiologie et Ecotoxicologie des Systèmes Aquatiques (LEESA), Université Bordeaux 1/UMR CNRS 5805, Place du Dr Peyneau, 33120, Arcachon, France |
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Abstract: | Metallothionein (MT) response to cadmium (Cd) and zinc (Zn) bioaccumulation after single or combined direct exposure was compared
in two freshwater bivalves, Dreissena polymorpha (zebra mussel) and Corbicula fluminea (Asiatic clam). Bivalves were exposed to 0.133 μM Cd and/or 15.3 μM Zn, with metal and MT concentrations analysed in the
whole soft body after 1, 3, 10 and 24 days of exposure and compared with controls. Results showed significant increase in
MT concentrations in both species exposed to Cd and Cd+Zn with a higher accumulation of the protein compared to the control
in D. polymorpha for nevertheless similar Cd levels accumulated with time. Exposure to Zn alone led to a significant increase in MT concentrations
only in C. fluminea, whereas there was a lack of MT gene induction in the zebra mussels which was confirmed by MT mRNA quantification in gills
(RT-PCR). Mussel mortality after 10 days of exposure to Zn and Cd + Zn is discussed with regard to detoxification mechanisms,
which include metallothioneins. |
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Keywords: | metallothionein freshwater bivalves cadmium zinc gene expression |
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