title: Oxidative stress in Laeonereis acuta (Polychaeta, Nereididae): environmental and seasonal effects.
abstract: Laeonereis acuta was seasonally collected in an industrially polluted site (P) and in an unpolluted site (UP) at the Patos Lagoon estuary (southern Brazil). Glutathione S-transferase (GST), superoxide dismutase (SOD) and catalase (CAT) activity (U/mg protein) was determined in five groups of worms from each site. Metallothionein (MT - mol GSH/g ww) and lipid peroxides content (LPO - nmoles of cumene hydroperoxide/g ww) were also measured. Annual mean values for CAT (UP=3.7+/-0.3; P=5.7+/-0.6), GST (UP=0.034+/-0.003; P=0.045+/-0.004) and MT (UP=0.15+/-0.02; P=0.23+/-0.03) were higher (p<0.05) in worms from the P site. In autumn, CAT activity was higher (p<0.05) in worms from the P site (7.6 +/- 1.3) than in those from the UP site (3.6 +/- 0.4). In summer, MT concentration was higher in worms from the P site (0.37 +/- 0.03) than in those from the UP site (0.19 +/- 0.01). No significant difference (p>0.05) in the LPO content was observed in worms from the different sites or collected in different seasons. These results indicate that worms from the polluted site showed higher antioxidant responses than those from the unpolluted site, sufficient to prevent oxidative damage in terms of LPO.
authors.affiliation: Departamento de Ciências Fisiológicas, Fundação Universidade Federal do Rio Grande, Rua Eng. Alfredo Huch 475, 96201-900, Rio Grande, RS, Brazil.
authors.forename: Laura A
authors.initials: LA
authors.lastname: Geracitano
authors.forename: José M
authors.initials: JM
authors.lastname: Monserrat
authors.forename: Adalto
authors.initials: A
authors.lastname: Bianchini
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D015415:Biomarkers; D001938:Brazil; D002374:Catalase / Q000096:biosynthesis; D004781:Environmental Exposure; D004790:Enzyme Induction / Q000187:drug effects; D005982:Glutathione Transferase / Q000096:biosynthesis; D015227:Lipid Peroxidation / Q000187:drug effects; D008668:Metallothionein / Q000096:biosynthesis; D018384:Oxidative Stress / Q000187:drug effects*; D011077:Polychaeta / Q000201:enzymology*; D012621:Seasons; D012623:Seawater; D013053:Spectrophotometry; D013482:Superoxide Dismutase / Q000096:biosynthesis; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D015415:Biomarkers; D014874:Water Pollutants, Chemical; D008668:Metallothionein; D002374:Catalase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase