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Metallothionein turnover, cytosolic distribution and the uptake of Cd by the green mussel Perna viridis
Ng, T.Y-T.; Rainbow, P.S.; Amiard-Triquet, C.; Amiard, J.C.; Wang, W.X. (2007). Metallothionein turnover, cytosolic distribution and the uptake of Cd by the green mussel Perna viridis. Aquat. Toxicol. 84(Spec. Issue 2): 153-161. dx.doi.org/10.1016/j.aquatox.2007.01.010
In: Aquatic Toxicology. Elsevier Science: Tokyo; New York; London; Amsterdam. ISSN 0166-445X, more
Peer reviewed article  

Also published as
  • Ng, T.Y-T.; Rainbow, P.S.; Amiard-Triquet, C.; Amiard, J.C.; Wang, W.X. (2007). Metallothionein turnover, cytosolic distribution and the uptake of Cd by the green mussel Perna viridis, in: Wood, C.M. et al. (Ed.) Proceedings of a Symposium: SETAC 27th Annual Meeting. A Tribute to Rick Playle: The interface of toxicology, physiology, and modeling in improving water quality regulations for metals, Montreal, Quebec, Canada, November 5-9, 2006. Aquatic Toxicology, 84(Spec. Issue 2): pp. 153-161, more

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Keywords
    Cadmium; Metallothioneins; Perna viridis (Linnaeus, 1758) [WoRMS]; ISEW, Hong Kong, Tolo Harbour; Marine

Authors  Top 
  • Ng, T.Y-T.
  • Rainbow, P.S.
  • Amiard-Triquet, C.
  • Amiard, J.C.
  • Wang, W.X.

Abstract
    We examined the relationship between Cd kinetics (uptake from solution and diet, and efflux), metallothionein turnover, and changes in the cytosolic distribution of accumulated Cd between protein fractions in the green mussel Perna viridis. We pre-exposed the mussels to 5, 20, 50 and 200 μg l−1 of Cd for 1 week and determined the biokinetics of Cd uptake and efflux in the mussels. The dietary assimilation efficiency of Cd increased by 2 times following exposure to 20–200 μg l−1 Cd, but the dissolved uptake rate was unchanged by pre-exposure to any Cd concentrations. The efflux rate of Cd was also similar among control and Cd pre-exposed mussels. The cytosolic distribution of Cd in the mussels that had been exposed to dissolved Cd, showed that besides metallothionein (7000–20,000 Da), high molecular weight proteins (>20,000 Da) were important for Cd binding and depuration. In general, the Cd pre-exposed mussels had higher metallothionein turnover with a higher metallothionein synthesis rate, but similar metallothionein breakdown rates as the control mussels. Metallothionein synthesis rate was correlated to the dietary assimilation of Cd, whereas metallothionein breakdown and Cd efflux rate were independent of each other. This study provides important new information for the role of metallothionein turnover on Cd kinetics in an aquatic invertebrate.

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