The role of glutathione metabolism in tolerance of tobacco BY-2 suspension cells to microcystin-RR.
This study was undertaken to investigate the role of the glutathione-involved detoxifying mechanism in defending the tobacco BY-2 suspension cells against microcystin-RR (MC-RR). Analysis showed that exposure of the cells to different concentrations of MC-RR (0.1, 1 and 10 microg/mL) for 0-6 days resulted in a time and concentration-dependent decrease in cell viability and increase in reactive oxygen species (ROS) content. Reduced glutathione (GSH) and total glutathione (tGSH) content as well as glutathione reductase (GR), glutathione peroxidase (GPX) and glutathione-S-transferase (GST) activities significantly increased after 3-4 days exposure in the highest two concentration treated groups, while decreased until reaching the control values except for GPX at day 6. Oxidized glutathione (GSSG) content markedly increased compared with control in high concentration MC-RR treated group after 6 days exposure. The GSH/GSSG ratio was much higher than control in 10 microg/mL MC-RR treated group at day 4, but after 6 days exposure, the ratios in all treated groups were lower than that of the control group.
Huang
Wen Min
WM
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, PR China.
Xing
Wei
W
Li
Dun Hai
DH
Liu
Yong Ding
YD
D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D005978:Glutathione / Q000378:metabolism*; D019803:Glutathione Disulfide / Q000378:metabolism; D008387:Marine Toxins; D052998:Microcystins / Q000633:toxicity*; D018384:Oxidative Stress; D013535:Suspensions; D014026:Nicotiana / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism
D008387:Marine Toxins; D052998:Microcystins; D013535:Suspensions; C063855:microcystin RR; D005978:Glutathione; D019803:Glutathione Disulfide