title: Assessment of the effects of orally administered ferrous sulfate on Oncopeltus fasciatus (Heteroptera: Lygaeidae).
abstract: Iron is an essential nutrient needed for multiple biological processes, but it is also an effective pro-oxidant in its reduced form. Environmental sources of iron toxic species include reduced soils from rice plantations, polluted natural areas from metal industry waste, or iron oxides used in soil bioremediation. Few studies have been conducted to assess the toxicity of iron species in insects. The present work aims to assess the oxidative stress effects of ferrous sulfate administered in drinking water after acute exposure (96 h) to adults of the insect model Oncopeltus fasciatus (Dallas). Mortality was higher in exposed groups and significantly associated with iron treatment (OR [95% CI]; 11.8 [6.1-22.7]). Higher levels of body iron content were found in insects exposed to ferrous sulfate, with an increase of 5-6 times with respect to controls. Catalase activity and lipid peroxidation (TBARS content), but not glutathione S-transferase activity, were significantly higher in exposed insects and significantly correlated with body iron content (Pearson coefficient of 0.68 and 0.74, respectively) and between them (0.78). The present work demonstrates that, despite the disruption in water and food intake caused by iron administration, this metal is accumulated by insect causing lipid peroxidation and eliciting an antioxidant response mediated by catalase.
authors.affiliation: Department of Cellular Biology, Functional Biology and Physical Anthropology, University of Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia, Spain.|Epidemiology and Environmental Health Joint Research Unit, FISABIO-UJI-UV, Valencia, Spain.|Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Valencia, Spain.
authors.forename: Amparo
authors.initials: A
authors.lastname: Ferrero
authors.affiliation: Department of Cellular Biology, Functional Biology and Physical Anthropology, University of Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia, Spain.
authors.forename: Amparo
authors.initials: A
authors.lastname: Torreblanca
authors.affiliation: Department of Cellular Biology, Functional Biology and Physical Anthropology, University of Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia, Spain. Maria.D.Garcera@uv.es.
authors.forename: María Dolores
authors.identifier: http://orcid.org/0000-0003-4264-8991
authors.initials: MD
authors.lastname: Garcerá
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D002374:Catalase / Q000378:metabolism; D005296:Ferrous Compounds; D020062:Heteroptera; D015227:Lipid Peroxidation / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects
chemical_list: D000975:Antioxidants; D005296:Ferrous Compounds; C020748:ferrous sulfate; D002374:Catalase
keywords: Catalase activity; Feeding behavior; Glutathione S-transferase activity; Iron; Lipid peroxidation; Oncopeltus fasciatus; Oxidative stress