title: Toxic effects of erythromycin, ciprofloxacin and sulfamethoxazole exposure to the antioxidant system in Pseudokirchneriella subcapitata.
abstract: We tested antioxidant responses of the green microalga Pseudokirchneriella subcapitata exposed to different concentrations of the three antibiotics erythromycin (ETM), ciprofloxacin (CPF) and sulfamethoxazole (SMZ). Measurements included the level of lipid peroxidation, the total antioxidative capacity and three major antioxidant mechanisms: the ascorbate-glutathione cycle, the xanthophyll cycle and the enzyme activities of catalase (CAT), superoxide dismutase (SOD), guaiacol glutathione peroxidase (GPX) and glutathione-S-transferase (GST). Three antibiotics significantly affect the antioxidant system of P. subcapitata, but in different ways the alga was more tolerant to CPF and SMZ exposures than to ETM exposure. ETM caused reductions in AsA and GSH biosynthesis, ascorbate-glutathione cycle, xanthophylls cycle and antioxidant enzyme activities. The toxicity of CPF seems to be mainly overcome via induction of the ascorbate-glutathione cycle and CAT, SOD and GPX activities, while the toxicity of SMZ on the photosynthetic apparatus is predominantly reduced by the xanthophyll cycle and GST activity.
authors.affiliation: Department of Ecology, Jinan University, Guangzhou 510632, China.
authors.forename: Xiang-Ping
authors.initials: XP
authors.lastname: Nie
authors.forename: Bin-Yang
authors.initials: BY
authors.lastname: Liu
authors.forename: Hui-Juan
authors.initials: HJ
authors.lastname: Yu
authors.forename: Wei-Qiu
authors.initials: WQ
authors.lastname: Liu
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Yang
mesh_terms: D000900:Anti-Bacterial Agents / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D000460:Chlorophyta / Q000187:drug effects* / Q000378:metabolism; D002939:Ciprofloxacin / Q000633:toxicity*; D004917:Erythromycin / Q000633:toxicity*; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D013420:Sulfamethoxazole / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical; D002939:Ciprofloxacin; D004917:Erythromycin; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D005978:Glutathione; D013420:Sulfamethoxazole