title: Microcystin-RR-induced accumulation of reactive oxygen species and alteration of antioxidant systems in tobacco BY-2 cells.
abstract: Microcystins are cyclic heptapeptide hepatoxins produced by cyanobacteria. It has been shown that microcystins have adverse effects on animals and on plants as well. Previous researches also indicated that microcystins were capable of inducing oxidative damage in animals both in vivo and in vitro. In this study, tobacco BY-2 suspension cell line was applied to examine the effects of microcystin-RR on plant cells. Cell viability and five biochemical parameters including reactive oxygen species (ROS), superoxide dismutase (SOD), catalase (CAT), glutathione peroxide (GPX) and peroxide dismutase (POD) were investigated when cells were exposed to 50mg/L microcystin-RR. Results showed that microcystin-RR evoked decline of the cell viability to approximately 80% after treating for 144 h. ROS levels, POD and GPX activities of the treated cells were gradually increased with a time dependent manner. Changes of SOD and CAT activities were also detected in BY-2 cells. After 168 h recovery, ROS contents, POD, GPX and CAT activities returned to normal levels. These results suggest that the microcystin-RR can cause the increase of ROS contents in plant cells and these changes led to oxidant stress, at the same time, the plant cells would improve their antioxidant abilities to combat mirocystin-RR induced oxidative injury.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China.
authors.forename: Liyan
authors.initials: L
authors.lastname: Yin
authors.forename: Jiaquan
authors.initials: J
authors.lastname: Huang
authors.forename: Wenming
authors.initials: W
authors.lastname: Huang
authors.forename: Dunhai
authors.initials: D
authors.lastname: Li
authors.forename: Gaohong
authors.initials: G
authors.lastname: Wang
authors.forename: Yongding
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D005979:Glutathione Peroxidase / Q000378:metabolism; D007202:Indicators and Reagents; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic / Q000633:toxicity*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism; D014026:Nicotiana / Q000166:cytology / Q000201:enzymology / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D007202:Indicators and Reagents; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; D017382:Reactive Oxygen Species; C063855:microcystin RR; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase