title: Toxicological effects induced by the nanomaterials fullerene and nanosilver in the polychaeta Laeonereis acuta (Nereididae) and in the bacteria communities living at their surface.
abstract: Fullerene (nC60) and nanosilver (nAg) are nanomaterials with bactericide properties. The increments in their use raise questions about their potential environmental impacts, including estuarine ones. The polychaete Laeonereis acuta (Nereididae) secretes mucus that is colonized by bacteria communities. We analyzed the antioxidant and oxidative damage responses of anterior, middle and posterior region of L. acuta and bacteria communities after nC60 or nAg exposure during 24 h. Molecular analysis showed a prevalence of Vibrio genera in the communities. Bacteria biomass was lowered in worms exposed to 1.0 mg/L of nAg. nC60 reduced total antioxidant capacity of bacteria from worms exposed to 0.1 mg/L. Worms anterior region presented lower antioxidant capacity after exposure to 1.0 mg nC60/L, and the same was observed in the posterior region of worms exposed to 1.0 mg nAg/L. Lipid peroxidation was reduced in the anterior region of worms exposed to nC60 and the opposite was observed in the posterior region.
authors.affiliation: Instituto de Ciências Biológicas (ICB), Universidade Federal do Rio Grande - FURG, Rio Grande, Brazil.
authors.forename: Bianca Fell
authors.initials: BF
authors.lastname: Marques
authors.forename: Lucas Freitas
authors.initials: LF
authors.lastname: Cordeiro
authors.forename: Luiza Wilges
authors.initials: LW
authors.lastname: Kist
authors.forename: Maurício Reis
authors.initials: MR
authors.lastname: Bogo
authors.forename: Gerardo
authors.initials: G
authors.lastname: López
authors.forename: Gisela
authors.initials: G
authors.lastname: Pagano
authors.forename: Diana Tomazi
authors.initials: DT
authors.lastname: Muratt
authors.forename: Leandro Machado
authors.initials: LM
authors.lastname: de Carvalho
authors.forename: Irene Clemes
authors.initials: IC
authors.lastname: Külkamp-Guerreiro
authors.forename: José M
authors.initials: JM
authors.lastname: Monserrat
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000633:toxicity*; D000975:Antioxidants / Q000378:metabolism; D018533:Biomass; D037741:Fullerenes / Q000633:toxicity*; D015227:Lipid Peroxidation; D053768:Metal Nanoparticles / Q000633:toxicity*; D018384:Oxidative Stress / Q000187:drug effects; D011077:Polychaeta / Q000187:drug effects* / Q000382:microbiology; D011157:Population Dynamics; D012834:Silver / Q000737:chemistry / Q000378:metabolism / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D000900:Anti-Bacterial Agents; D000975:Antioxidants; D037741:Fullerenes; D014874:Water Pollutants, Chemical; D012834:Silver
keywords: Bacteria communities; Fullerene; Nanosilver; Nanotoxicology; Polychaete