Employing multi-omics to elucidate the hormetic response against oxidative stress exerted by nC60 on Daphnia pulex
2019
This study evaluated hormetic effect of oxidative stress exerted by fullerene crystals (nC₆₀) on Daphnia pulex, employing transcriptomics and metabolomics. D. pulex were exposed to various concentrations of nC₆₀ for 21 days. Hormetic effect of oxidative stress was most evident after 7 days, with markedly increased L-Glutathione (GSH) concentration and Superoxide Dismutase (SOD) activity at low doses of nC₆₀ exposure, and oppositely at high doses. The transcriptomics and metabolomics were used to elucidate the molecular mechanism underlying the hormesis in oxidative stress. There were significant alterations in major pathways involving oxidative stress and energy metabolism in D. pulex. Some important intermediates and the expression of their regulatory genes coincided with each other with first up-regulated and then down-regulated with the concentration increased, consistent with the hormesis description. The nC₆₀ interfered the TCA cycle of D. pulex. The synthesis of L-cysteine and glutamate was directly affected, and further disturbed the synthesis of GSH. This work is of great significance to provide the molecular-level evidence into the hormetic effect in oxidative stress of D. pulex exposed to nC₆₀.
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