Authors: Ribas Ferreira, Josencler L.; Lonné, María Noelia; França, Thiago A.; Maximilla, Naiana R.; Lugokenski, Thiago H.; Costa, Patrícia G.; Fillmann, Gilberto; Soares, Félix A.; de la Torre, Fernando Roman; Monserrat, José María
Publication Date: 2013.
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 πGST. 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 μg/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 π 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.
Author affiliation: Ribas Ferreira, Josencler L.. Universidade Federal do Rio Grande do Sul; Brasil
Author affiliation: Lonné, María Noelia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Author affiliation: França, Thiago A.. Universidade Federal do Rio Grande do Sul; Brasil
Author affiliation: Maximilla, Naiana R.. Universidade Federal do Rio Grande do Sul; Brasil
Author affiliation: Lugokenski, Thiago H.. Universidade Federal de Santa Maria. Departamento de Química; Brasil
Author affiliation: Costa, Patrícia G.. Universidade Federal do Rio Grande do Sul; Brasil
Author affiliation: Fillmann, Gilberto. Universidade Federal do Rio Grande do Sul; Brasil
Author affiliation: Soares, Félix A.. Universidade Federal de Santa Maria. Departamento de Química; Brasil
Author affiliation: de la Torre, Fernando Roman. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina
Author affiliation: Monserrat, José María. Universidade Federal do Rio Grande do Sul; Brasil. Instituto Nacional de Ciência e Tecnologia de Nanomateriais de Carbono; Brasil
Repository: CONICET Digital (CONICET). Consejo Nacional de Investigaciones Científicas y Técnicas