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TitleEnzymatic biomarkers can portray nanoCuO-induced oxidative and neuronal stress in freshwater shredders
Author(s)Pradhan, Arunava
Silva, Carla O.
Silva, Carlos J. R.
Pascoal, Cláudia
Cássio, Fernanda
Dose-Response Relationship, Drug
Fresh Water
Glutathione Peroxidase
Glutathione Reductase
Metal Nanoparticles
Oxidative Stress
Stress, Physiological
Superoxide Dismutase
Toxicity Tests
Water Pollutants, Chemical
Oxidative and neuronal stress
Freshwater invertebrate shredder
Issue date28-Sep-2016
JournalAquatic Toxicology
CitationArunava Pradhan, Carla O. Silva, Carlos Silva, Cláudia Pascoal, Fernanda Cássio, Enzymatic biomarkers can portray nanoCuO-induced oxidative and neuronal stress in freshwater shredders, Aquatic Toxicology, 180 (2016) 227-235
Abstract(s)Commercial applications of nanometal oxides have increased concern about their release into natural waters and consequent risks to aquatic biota and the processes they drive. In forest streams, the invertebrate shredder Allogamus ligonifer plays a key role in detritus food webs by transferring carbon and energy from plant litter to higher trophic levels. We assessed the response profiles of oxidative and neuronal stress enzymatic biomarkers in A. ligonifer after 96h exposure to nanoCuO at concentration ranges <LC30. To better understand the contribution of ionic form in nanoCuO-induced stress, Cu2+ released from nanoCuO was quantified and the enzymatic responses to Cu2+ exposure at similar effective concentrations were compared. The highest activities of superoxide dismutase (SOD), glutathione peroxidase (GPx) and glutathione reductase (GR) were observed at concentrations <LC5. The enzymatic activities decreased at effective concentrations between LC10 and LC30. GR activity remained higher than in control at all concentrations. The activity of glutathione S-transferase (GST) increased whereas that of catalase (CAT) decreased at concentrations between LC10 and LC30. The response patterns suggested that antioxidant enzymes could prevent oxidative stress at low concentrations (<LC10) of nanoCuO, thereby contributing to the survival of A. ligonifer. At concentrations between LC10 and LC30, effects of nanoparticulate or released ionic copper on enzyme activities were concentration-dependent, and led to oxidative stress and even to animal death. The activity of acetylcholinesterase (AChE) was strongly inhibited even at concentrations <LC10, suggesting neuronal stress in A. ligonifer.
DescriptionSupplementary data associated with this article can be found, in the online version, at:
Publisher version
AccessRestricted access (Author)
Appears in Collections:CDQuim - Artigos (Papers)

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