Genotoxic Testing of Titanium Dioxide Nanoparticles in Far Eastern Mussels, Mytilus Trossulus

Document Type : Original Research Paper


1 V.I. Il’icev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia

2 A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia


Manufactured nanoparticles (NP) have caused extreme concern about their ecotoxicological effects on the marine systems. In this study, we investigated the biological effects (oxidative stress and genotoxic response) of TiO2-NP at predicted environmental relevant concentrations (0.2 mg/l and 1 mg/l) on marine mussel Mytilus trossulus a dominant member of the far eastern coastal community. The results of the experiment revealed that TiO2-NP when suspended in seawater, formed agglomerates ranging from 400 nm to several μm in diameter. However, TiO2-NP caused obviously oxidative damage on the mussel as evidenced by the significant elevated levels of malondialdehyde (MDA) in the gill and digestive gland. The genotoxic potential of TiO2-NP was assessed by comet assay, which detect primary DNA damage. The gill and digestive gland cells showed significantly enhanced DNA damage for both concentrations of TiO2-NP compared to the control group. These results propose that the TiO2-NP are entering the marine coastal waters can cause genotoxic effect on mollusks and comet assay can be successfully applied as an effective tool for risk assessment of NP on the marine invertebrates. The findings of this study demonstrate that the aggregation of TiO2-NP does not reduced of NP ecotoxicity, but only changes the biological responses.


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