Back to Search
Start Over
Sensitive biomarker responses of the shrimp Palaemonetes argentinus exposed to chlorpyrifos at environmental concentrations: Roles of alpha-tocopherol and metallothioneins.
- Source :
-
Aquatic toxicology (Amsterdam, Netherlands) [Aquat Toxicol] 2016 Oct; Vol. 179, pp. 72-81. Date of Electronic Publication: 2016 Aug 24. - Publication Year :
- 2016
-
Abstract
- The aim of this study was to evaluate the toxic effects of chlorpyrifos (CPF) at environmental concentrations on the shrimp Palaemonetes argentinus, a South American native species. Organisms were exposed to environmentally relevant concentrations of CPF (from 3.5 to 94.5ngCPFL(-1)) at laboratory conditions for 96h. A wide battery of biochemical responses including bioaccumulation, damage and defense biomarkers were measured in cephalothorax and abdomen of shrimp. The concentration of CPF was below the detection limit of the method in both body sectors (8ngCPFg(-1)ww), probably indicating fast biotransformation of the parental compound. Our results showed that CPF exposure inhibits acetylcholinesterase activity from 3.5ngCPFL(-1), a concentration below the suggested Argentinean guidelines for the protection of aquatic biota. Moreover, oxidative stress was evidenced by increased H2O2 content and increased levels of TBARs and carbonyl groups in proteins. The induction of antioxidant enzymes like catalase, glutathione S-transferase and glutathione peroxidase seems not be sufficient to prevent oxidative damages. In addition, the mobilization of α-tocopherol from abdomen to cephalothorax was observed and reported for the first time in non-reproductive condition. Likewise, a strong diminution of metallothioneins occurred in cephalothorax from the lowest CPF concentration while induction occurred from the same treatment in abdomen as an oxidative stress response. Finally, significant correlation between Integrated Biomarker Response values and exposure concentrations suggest the usefulness of P. argentinus as bioindicator of CPF exposure at concentrations as low as environmental ones.<br /> (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Subjects :
- Animals
Antioxidants metabolism
Catalase metabolism
Environmental Exposure
Glutathione Peroxidase metabolism
Glutathione Transferase metabolism
Hydrogen Peroxide metabolism
Oxidative Stress drug effects
Palaemonidae metabolism
Water Pollutants, Chemical chemistry
Biomarkers metabolism
Chlorpyrifos toxicity
Insecticides toxicity
Metallothionein metabolism
Palaemonidae drug effects
Water Pollutants, Chemical toxicity
alpha-Tocopherol metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1514
- Volume :
- 179
- Database :
- MEDLINE
- Journal :
- Aquatic toxicology (Amsterdam, Netherlands)
- Publication Type :
- Academic Journal
- Accession number :
- 27588703
- Full Text :
- https://doi.org/10.1016/j.aquatox.2016.08.014