Effects of arsenic (As) exposure on the antioxidant status of gills of the zebrafish Danio rerio (Cyprinidae).
In fishes, arsenic (As) is absorbed via the gills and is capable of causing disturbance to the antioxidant system. The objective of present study was to evaluate antioxidant responses after As exposure in gills of zebrafish (Danio rerio, Cyprinidae). Fish were exposed for 48 h to three concentration of As, including the highest As concentration allowed by current Brazilian legislation (10 microg As/L). A control group was exposed to tap water (pH 8.0; 26 degrees C; 7.20 mg O(2)/L). As exposure resulted in (1) an increase (p<0.05) of glutathione (GSH) levels after exposure to 10 and 100 microg As/L, (2) an increase of the glutamate cysteine ligase (GCL) activity in the same concentrations (p<0.05), (3) no significant differences in terms of glutathione reductase, glutathione-S-transferase and catalase activities; (4) a significantly lower (p<0.05) oxygen consumption after exposure to 100 microg As/L; (4) no differences in terms of oxygen reactive species generation and lipid peroxidation content (p>0,05). In the gills, only inorganic As was detected. Overall, it can be concluded that As affected the antioxidant responses increasing GCL activity and GSH levels, even at concentration considered safe by Brazilian legislation.
Ventura-Lima
Juliane
J
Programa de Pós-Graduação em Ciências Fisiológicas-Fisiologia Animal Comparada, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, Brazil.
de Castro
Micheli Rosa
MR
Acosta
Daiane
D
Fattorini
Daniele
D
Regoli
Francesco
F
de Carvalho
Leandro Machado
LM
Bohrer
Denise
D
Geracitano
Laura A
LA
Barros
Daniela Martí
DM
Marins
Luis F F
LF
da Silva
Rosane Souza
RS
Bonan
Carla Denise
CD
Bogo
Maurício Reis
MR
Monserrat
José M
JM
D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001151:Arsenic / Q000378:metabolism / Q000633:toxicity*; D005880:Gills / Q000187:drug effects / Q000378:metabolism*; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation; D010101:Oxygen Consumption / Q000187:drug effects; D015027:Zebrafish / Q000378:metabolism*
D000975:Antioxidants; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D005978:Glutathione; D001151:Arsenic