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Oxidative stress induced by titanium dioxide nanoparticles increases under seawater acidification in the thick shell mussel Mytilus coruscus

Artikel i vetenskaplig tidskrift
Författare X. Z. Huang
Z. K. Liu
Z. Xie
Samuel Dupont
W. Huang
F. L. Wu
H. Kong
L. P. Liu
Y. M. Sui
D. H. Lin
W. Q. Lu
M. H. Hu
Youji Wang
Publicerad i Marine Environmental Research
Volym 137
Sidor 49-59
ISSN 0141-1136
Publiceringsår 2018
Publicerad vid Sven Lovén centrum för marina vetenskaper
Institutionen för biologi och miljövetenskap
Sidor 49-59
Språk en
Länkar dx.doi.org/10.1016/J.marenvres.2018...
Ämnesord Nano-TiO2, pH, Gill, Digestive gland, Biochemical responses, trout oncorhynchus-mykiss, carp cyprinus-carpio, fresh-water fish, crassostrea-virginica, tio2 nanoparticles, aquatic environment, ocean, acidification, physiological energetics, engineered nanoparticles, ruditapes-philippinarum, Environmental Sciences & Ecology, Marine & Freshwater Biology, Toxicology
Ämneskategorier Miljövetenskap

Sammanfattning

Biochemical responses of the mussel Mytflrn coruscus exposed to different concentrations of titanium dioxide nanoparticles (nano-Ti0(2)) (0, 2.5, 10mgL(-1)) and two pH levels (pH 8.1 and pH 7.3) for 14 days. Mussel responses were also investigated after a 7 days recovery period (pH 8.1 and no nanoparticle). Exposure to nanoTi0(2) led changes in antioxidant indexes (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione (GSH)), biotransformation enzyme activity (GST) and malondialdehyde level (MDA) in gills and digestive glands. An increase in MDA level and a decrease in SOD and GSH activities were observed in gill of mussels exposed to 10 mg L-n1 nano-TiO2. This effect was more severe in mussels kept at pH 7.3 as compared to pH 8.1. A different response was observed in the digestive gland as SOD, CAT and GSH levels increased in mussels exposed to nano-TiO2. These contrasting results in digestive glands and gills were only evident at high concentration of nano-TiO2 and low pH. A 7 days recovery period was not sufficient to fully restore SOD, GPx, GST, GSH and MDA levels to levels before exposure to nano-TiO2 and low pH. Overall, our results confirmed that seawater acidification modulates effects of nanoparticles in mussels, and that gills are more sensitive to these stressors as compared with digestive glands.

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