Co-exposure of the organic nanomaterial fullerene C₆₀ with benzo[a]pyrene in Danio rerio (zebrafish) hepatocytes: Evidence of toxicological interactions

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• 作者：Josencler L. Ribas Ferreira ; Mar铆a Noelia Lonn茅 ; Thiago A. Fran莽a ; Naiana R. Maximilla ; Thiago H. Lugokenski ; Patr铆cia G. Costa ; Gilberto Fillmann ; F茅lix A. Antunes Soares ; Fern ; o R. de la Torre ; Jos茅 Mar铆a Monserrat
• 关键词：Nanotoxicology ; BaP ; Synergistic effect ; Delivery ; GST
• 刊名：Aquatic Toxicology
• 出版年：February, 2014
• 年：2014
• 卷：147
• 期：Complete
• 页码：76-83
• 全文大小：2278 K

文摘

Compounds from the nanotechnology industry, such as carbon-based nanomaterials, are strong candidates to contaminate aquatic environments because their production and disposal have exponentially grown in a few years. Previous evidence shows that fullerene C₆₀, a carbon nanomaterial, can facilitate the intake of metals or PAHs both in vivo and in vitro, potentially amplifying the deleterious effects of these toxicants in organisms. The present work aimed to investigate the effects of fullerene C₆₀ in a Danio rerio (zebrafish) hepatocyte cell lineage exposed to benzo[a]pyrene (BaP) in terms of cell viability, oxidative stress parameters and BaP intracellular accumulation. Additionally, a computational docking was performed to investigate the interaction of the fullerene C₆₀ molecule with the detoxificatory and antioxidant enzyme 蟺GST. Fullerene C₆₀ provoked a significant (p < 0.05) loss in cellular viability when co-exposed with BaP at 0.01, 0.1 and 1.0 渭g/L, and induced an increase (p < 0.05) in BaP accumulation in the cells after 3 and 4 h of exposure. The levels of reactive oxygen species (ROS) in the cells exposed to BaP were diminished (p < 0.05) by the fullerene addition, and the increase of the GST activity observed in the BaP-only treated cells was reduced to the basal levels by co-exposure to fullerene. However, despite the potential of the fullerene molecule to inhibit 蟺 GST activity, demonstrated by the computational docking, the nanomaterial did not significantly (p > 0.05) alter the enzyme activity when added to GST purified extracts from the zebrafish hepatocyte cells. These results show that fullerene C₆₀ can increase the intake of BaP into the cells, decreasing cell viability and impairing the detoxificatory response by phase II enzymes, such as GST, and this latter effect should be occurring at the transcriptional level.