title: Influence of the exposure way and the time of sacrifice on the effects induced by a single dose of pure Cylindrospermopsin on the activity and transcription of glutathione peroxidase and glutathione-S-transferase enzymes in Tilapia (Oreochromis niloticus).
abstract: Cylindrospermopsin is a cyanobacterial toxin frequently implicated in cyanobacterial blooms that is approaching an almost cosmopolitan distribution pattern. Moreover, the predominant extracellular availability of this cyanotoxin makes it particularly likely to be taken up by a variety of aquatic organisms including fish. Recently, Cylindrospermopsin has shown to alter the activity and gene expression of some of the glutathione related enzymes in tilapias (Oreochromis niloticus), but little is known about the influence of the route of exposure and the time of sacrifice after a single exposure to Cylindrospermopsin on these biomarkers. With this aim, tilapias were exposed by gavage or by intraperitoneal injection to a single dose of 200 μg kg(-1) bw of pure Cylindrospermopsin and after 24h or 5d they were sacrificed. The activity and relative mRNA expression by real-time PCR of antioxidant enzymes glutathione peroxidase and soluble glutathione-S-transferases (sGST) and the sGST protein abundance by Western blot analysis were evaluated in liver and kidney. Results showed differential responses in dependence on the variables considered with a higher toxicity with the intraperitoneal exposure and with 5d as time of sacrifice.
authors: Area of Toxicology, Profesor García González 2, 41012 Seville, Spain.
authors: Daniel
authors: D
authors: Gutiérrez-Praena
authors: Angeles
authors: A
authors: Jos
authors: Silvia
authors: S
authors: Pichardo
authors: María
authors: M
authors: Puerto
authors: Ana M
authors: AM
authors: Cameán
mesh_terms: D000470:Alkaloids; D000818:Animals; D001427:Bacterial Toxins; D023681:Cichlids / Q000235:genetics / Q000378:metabolism*; D000458:Cyanobacteria / Q000378:metabolism*; D000087522:Cyanobacteria Toxins; D004789:Enzyme Activation / Q000187:drug effects*; D029941:Fish Proteins / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects; D005979:Glutathione Peroxidase / Q000235:genetics / Q000378:metabolism*; D005982:Glutathione Transferase / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D014158:Transcription, Genetic / Q000187:drug effects; D014498:Uracil / Q000031:analogs & derivatives* / Q000378:metabolism; D014871:Water Microbiology
chemical_list: D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; D029941:Fish Proteins; D012333:RNA, Messenger; C089595:cylindrospermopsin; D014498:Uracil; D005979:Glutathione Peroxidase; D005982:Glutathione Transferase