Metallothionein mRNA induction is correlated with the decrease of DNA strand breaks in cadmium exposed zebra mussels

Type Article
Date 2014-05
Language English
Author(s) Vincent-Hubert Francoise1, Chatel Amelie1, Gourlay-France Catherine1
Affiliation(s) 1 : IRSTEA, Unite Rech Hydrosyst & Bioprocedes, F-92761 Antony, France.
Source Mutation Research-genetic Toxicology And Environmental Mutagenesis (1383-5718) (Elsevier Science Bv), 2014-05 , Vol. 766 , P. 10-15
DOI 10.1016/j.mrgentox.2014.03.006
WOS© Times Cited 6
Keyword(s) Benzo[a]pyrene, Cadmium, Metallothionein, Aryl hydrocarbon receptor, Antioxidant enzymes, RT-qPCR
Abstract We have previously shown that cadmium (Cd) and Benzo[a]pyrene (BaP) induced early DNA damages in zebra mussels, and that the level of DNA strand breaks (SB) returned to a basal level after 3 days of exposure to Cd. The aim of the present study was to go further in the mechanisms of Cd and BaP detoxification. For that purpose, expression of genes encoding for metallothionein (MT), Aryl Hydrocarbon Receptor (AHR), P-gP, catalase, glutathione S-transferase and Heat shock protein 70 (HSP70) proteins have been measured using RT-qPCR. Data reported here show that Cd is a strong inducer of MT and HSP70 genes, and that BaP is a strong inducer of P-gP and AHR genes. Exposure to Cd and BaP resulted in moderate changes in antioxidant enzymes mRNA. Since the increase of MT mRNA occured when the DNA SB level returned to its basal level, we can suggest that MT is implicated in cadmium detoxification.
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