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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Flores-Rojas, Nelida Cecilia Esterhuizen-Londt, Maranda Pflugmacher, Stephan |
| Description | Author Affiliation: Flores-Rojas NC ( Technische Universität Berlin, Department of Ecotoxicological Impact Research and Ecotoxicology, Ernst-Reuter-Platz 1, 10587 Berlin, Germany. Electronic address: n.floresrojas@mailbox.tu-berlin.de.); Esterhuizen-Londt M ( Technische Universität Berlin, Department of Ecotoxicological Impact Research and Ecotoxicology, Ernst-Reuter-Platz 1, 10587 Berlin, Germany. Electronic address: esterhuizen-londt@tu-berlin.de.); Pflugmacher S ( Technische Universität Berlin, Department of Ecotoxicological Impact Research and Ecotoxicology, Ernst-Reuter-Platz 1, 10587 Berlin, Germany. Electronic address: stephan.pflugmacher@tu-berlin.de.) |
| Abstract | Cylindrospermopsin toxicity and oxidative stress have been examined in aquatic animals, however, only a few studies with aquatic plants have been conducted focusing on the potential for bioaccumulation of cylindrospermopsin. The oxidative stress effects caused by cylindrospermopsin on macrophytes have not yet been specifically studied. The oxidative stress response of Lemna minor L. with exposure to cylindrospermopsin, was therefore tested in this study. The hydrogen peroxide concentration together with the activities of the antioxidant enzymes (catalase, peroxidase, glutathione reductase and glutathione S-transferase) were determined after 24h (hours) of exposure to varying concentrations (0.025, 0.25, 2.5 and 25µg/L) of cylindrospermopsin. Responses with longer exposure periods (48, 96, 168h) were tested only with exposure to 2.5 and 25µg/L cylindrospermopsin. Additionally, the content of the carotenoids was determined as a possible non-enzymatic antioxidant defence mechanism against cylindrospermopsin. The levels of hydrogen peroxide increased after 24h even at the lowest cylindrospermopsin exposure concentrations. Catalase showed the most representative antioxidant response observed after 24h and maintained its activity throughout the experiment. Catalase activity corresponded with the contents of hydrogen peroxide at 2.5 and 25µg/L cylindrospermopsin. The data suggest that glutathione S-transferase, glutathione reductase and the carotenoid content act together with catalase but are more sensitive to higher concentrations of cylindrospermopsin and after a longer exposure period (168h). The results indicate that cylindrospermopsin promotes oxidative stress in L. minor at concentrations of 2.5 and 25µg/L. However, L. minor has sufficient defence mechanisms in place against this cyanobacterial toxin. Even though L. minor exhibits the potential to managing and control cylindrospermopsin contamination in aquatic systems, further studies in tolerance limits to cylindrospermopsin, uptake and experiments with prolonged exposure periods of more than 7 days are required. |
| File Format | HTM / HTML |
| ISSN | 0166445X |
| Volume Number | 169 |
| e-ISSN | 18791514 |
| Journal | Aquatic Toxicology |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-12-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Toxicology Araceae Drug Effects Oxidative Stress Uracil Analogs & Derivatives Water Pollutants, Chemical Toxicity Enzymology Bacterial Toxins Carotenoids Analysis Enzyme Activation Hydrogen Peroxide Marine Toxins Microcystins Oxidoreductases Genetics Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Health, Toxicology and Mutagenesis Aquatic Science |
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