Combined cytotoxicity and genotoxicity of a marine toxin and seafood contaminant metal ions (chromium and cadmium)

Environmental Toxicology
Ghada Souid-MensiEdmond E Creppy

Abstract

Algal bloom with consequent production of marine toxins contaminating bivalves is increasing in costal regions worldwide because of sea water quality worsening. Contamination of seafood by diarrheic shellfish poisoning toxins (DSP) together with metals is frequently reported, a phenomenon not fully explained yet. In this context, metal ions were assayed in clams collected from the banned area of Boughrara, Tunisia, contaminated by Gymnodinium and other algae such as Dinophysis sp, accumulated by these bivalves. The presence of toxic metals ions such as Chromium (Cr) and Cadmium (Cd) in meat, shells, and water released by the clams prompted us to experiment in Caco-2 intestinal cell line toxic effects of these heavy metals ions in combination with okadaic acid, one DSP present in clams to assess the potential global toxicity. Cr and Cd produce additive effects in (i) reactive oxygen species production, (ii) cytotoxicity as assessed by the mitochondrial activity testing method (MTT test), and (iii) DNA lesions evaluated by agarose gel electrophoresis and acridine orange staining. Exaggerated DNA fragmentation is observed, suggesting an overloading of repair capacity of Caco-2 cells. The apoptosis suggested by a DNA fragment sizin...Continue Reading

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Citations

Jun 29, 2011·Journal of Toxicology and Environmental Health. Part a·Fernanda Flórez-BarrósJuan Fernández-Tajes
Feb 19, 2013·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Fangbin CaoFeibo Wu
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Jan 21, 2015·Journal of Environmental Quality·Wendan XiaoTingqiang Li

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