title: Biochemical responses induced by co-exposition to arsenic and titanium dioxide nanoparticles in the estuarine polychaete Laeonereis acuta.
abstract: The production and use of nanoparticles, as titanium dioxide (nanoTiO2) is growing exponentially in the last years and their release into aquatic environment seem be inevitable. Once into environment, this nanomaterial can interact with other contaminant, as arsenic, and to exert toxic effect in living organisms. So, the objective of present study was to evaluate if the co-exposure to nanoTiO2(1mg/L) can alter the As effect (nominal concentration of 50μg/L) in the estuarine polychaeta Laeonereis acuta after 48h of exposure. Were performed biochemical analyses such ROS production, enzymatic activities (GST, GR and GSTΩ), total antioxidant capacity against peroxyl radicals and damage to macromolecules (lipid and DNA), besides also were determined the accumulation of total arsenic and arsenic speciation in the worms. The results showed that co-exposure induced an increase in the ROS levels, decrease in total antioxidant capacity, increase in GR activity, and damage in lipid and DNA. Also, the co-exposure showed to affect the metabolization capacity of arsenic characterized by increase in dimethylated arsenic forms, a compound moderately toxic. So, these results suggest that the co-exposure to both contaminants is harmful to this species and the use of nanoTiO2to treatment of contaminated water by arsenic should be considered of a toxicological point of view.
authors.affiliation: Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande - FURG, Rio Grande, RS, Brazil; Programa de Pós-Graduação em Ciências Fisiológicas - Fisiologia Animal Comparada- FURG, Brazil. Electronic address: silvanamnu@gmail.com.
authors.forename: Silvana Manske
authors.initials: SM
authors.lastname: Nunes
authors.affiliation: Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande - FURG, Rio Grande, RS, Brazil; Programa de Pós-Graduação em Ciências Fisiológicas - Fisiologia Animal Comparada- FURG, Brazil.
authors.forename: Marcelo Estrella
authors.initials: ME
authors.lastname: Josende
authors.affiliation: Programa de Pós-Graduação em Química Tecnológica e Ambiental-FURG, Brazil.
authors.forename: Caroline Pires
authors.initials: CP
authors.lastname: Ruas
authors.affiliation: Programa de Pós-Graduação em Química Tecnológica e Ambiental-FURG, Brazil.
authors.forename: Marcos Alexandre
authors.initials: MA
authors.lastname: Gelesky
authors.affiliation: Programa de Pós-Graduação em Ciências da Saúde-FURG, Brazil.
authors.forename: Flávio Manoel Rodrigues da Silva
authors.initials: FM
authors.lastname: Júnior
authors.affiliation: Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131, Ancona, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Fattorini
authors.affiliation: Programa de Pós-Graduação em Ciências da Saúde-FURG, Brazil.
authors.forename: Francesco
authors.initials: F
authors.lastname: Regoli
authors.affiliation: Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande - FURG, Rio Grande, RS, Brazil; Programa de Pós-Graduação em Ciências Fisiológicas - Fisiologia Animal Comparada- FURG, Brazil; Programa de Pós-Graduação em Aquacultura-FURG, Brazil.
authors.forename: José Marìa
authors.initials: JM
authors.lastname: Monserrat
authors.affiliation: Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande - FURG, Rio Grande, RS, Brazil; Programa de Pós-Graduação em Ciências Fisiológicas - Fisiologia Animal Comparada- FURG, Brazil.
authors.forename: Juliane
authors.initials: J
authors.lastname: Ventura-Lima
mesh_terms: D000818:Animals; D001151:Arsenic / Q000008:administration & dosage / Q000633:toxicity*; D001669:Biochemical Phenomena / Q000187:drug effects / Q000502:physiology; D063366:Estuaries; D053758:Nanoparticles / Q000008:administration & dosage / Q000633:toxicity*; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology; D011077:Polychaeta / Q000187:drug effects* / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D014025:Titanium / Q000008:administration & dosage / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000008:administration & dosage / Q000633:toxicity*
chemical_list: D017382:Reactive Oxygen Species; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; D001151:Arsenic
keywords: Antioxidant responses; Arsenic; Invertebrates; Nanotoxicology; Oxidative stress; Titanium dioxide nanoparticles