Abstract

ABSTRACT Microcystins (MC) produced by several cyanobacteria are potent hepatotoxins, whereas the toxicokinetics and subsequent detrimental effects ofMCare not fully understood in marine bivalves. In this study, the accumulation and depuration pattern of MC-Leucine-Arginine (MC-LR) along with the antioxidant response were investigated in the gill tissue of Pacific oyster Crassostrea gigas and blue mussel Mytilus edulis exposed to 0.1, 1, 10, and 20 µg L-1 MC-LR for 7 days. Time- and concentration-dependent accumulation and depuration of MC-LR were observed in the gill tissue during the exposure and depuration phases. The values for maximum accumulation of MC-LR and malondialdehyde content were statistically significant (P < 0.05) at the end of exposure (day 7) to 20 µg L-1 MC-LR for both the bivalves, and at the beginning of the depuration period when M. edulis and C. gigas were exposed to 10 and 20 µg L-1, respectively. A significant level of glutathione (GSH) was detected in M. edulis in response to 20 ...

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