Photo-induced toxicity and oxidative stress responses in Tigriopus japonicus exposed to nitro-polycyclic aromatic hydrocarbons and artificial light
| Autor: | Katsutoshi Ito, Toshimitsu Onduka, Kazunori Fujii, Mana Ito, Kazuhiko Mochida, Jiro Koyama, Daisuke Ojima |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Environmental Engineering Light Health Toxicology and Mutagenesis 010501 environmental sciences medicine.disease_cause 01 natural sciences Gas Chromatography-Mass Spectrometry Copepoda 03 medical and health sciences chemistry.chemical_compound medicine Animals Environmental Chemistry Ecotoxicology Polycyclic Aromatic Hydrocarbons 0105 earth and related environmental sciences chemistry.chemical_classification Reactive oxygen species Pyrenes Public Health Environmental and Occupational Health General Medicine General Chemistry Nitro Compounds Ascorbic acid Pollution Oxidative Stress 030104 developmental biology Solubility chemistry 1-Nitropyrene Environmental chemistry Toxicity Pyrene Reactive Oxygen Species Phototoxicity Water Pollutants Chemical Oxidative stress |
| Zdroj: | Chemosphere. 169:596-603 |
| ISSN: | 0045-6535 |
| Popis: | Photo-induced toxicity is an important phenomenon in ecotoxicology because sunlight reaches many organisms in their natural habitats. To elucidate whether sunlight enhances the toxicity of nitro-polycyclic aromatic hydrocarbons (nitro-PAHs), the acute toxicities of 10 nitro-PAHs and the related compound 1-nitropyrene (1-NP) to Tigriopus japonicus were assessed in darkness or under light conditions. In addition, the relationships among the toxicity of 1-NP to T. japonicus, lighting condition, and the concentration of reactive oxygen species (ROS) formed were investigated in the presence or absence of the ROS scavenger ascorbic acid in the test solutions. Light irradiation increased the toxicity of all tested nitro-PAHs except 1,5-dinitronaphthalene. Among the compounds tested, 1-NP was the most phototoxic: it was more than 1000 times more toxic under the light conditions than in darkness. In contrast, at the same light levels, pyrene was not phototoxic. Light irradiation induced the generation of ROS in the 1-NP exposure groups, and the immobilization rate of T. japonicus increased with the amount of ROS produced. The addition of ascorbic acid to the test solutions suppressed both the generation of ROS and the light-induced immobilization of T. japonicus. To accurately assess the ecotoxicologic risk of nitro-PAHs, their overall photo-induced toxicity must be considered. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect