Mitigation in Multiple Effects of Graphene Oxide Toxicity in Zebrafish Embryogenesis Driven by Humic Acid

• Published in: Environmental science & technology 2015-08, Vol.49 (16), p.10147-10154
• Main Authors: Chen, Yuming, Ren, Chaoxiu, Ouyang, Shaohu, Hu, Xiangang, Zhou, Qixing
• Format: Article
• Language: English
• Subjects: Animals; Chorion - drug effects; Chorion - ultrastructure; Danio rerio; Embryo, Nonmammalian - drug effects; Embryo, Nonmammalian - metabolism; Embryonic Development - drug effects; Environmental science; Freshwater; Graphene; Graphite - chemistry; Graphite - toxicity; Humic Substances - analysis; Mitochondria - drug effects; Mitochondria - metabolism; Mitochondria - ultrastructure; Nanomaterials; Nanostructures - chemistry; Oxidative stress; Oxidative Stress - drug effects; Toxicity; Zebrafish; Zebrafish - embryology
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/acs.est.5b02220

Graphene oxide (GO) is a widely used carbonaceous nanomaterial. To date, the influence of natural organic matter (NOM) on GO toxicity in aquatic vertebrates has not been reported. During zebrafish embryogenesis, GO induced a significant hatching delay and cardiac edema. The intensive interactions of GO with the chorion induces damage to chorion protuberances, excessive generation of •OH, and changes in protein secondary structure. In contrast, humic acid (HA), a ubiquitous form of NOM, significantly relieved the above adverse effects. HA reduced the interactions between GO and the chorion and mitigated chorion damage by regulating the morphology, structures, and surface negative charges of GO. HA also altered the uptake and deposition of GO and decreased the aggregation of GO in embryonic yolk cells and deep layer cells. Furthermore, HA mitigated the mitochondrial damage and oxidative stress induced by GO. This work reveals a feasible antidotal mechanism for GO in the presence of NOM and avoids overestimating the risks of GO in the natural environment.