Effects of environmental anoxia and different periods of reoxygenation on oxidative balance in gills of the estuarine crab Chasmagnathus granulata.
We investigated the effects of anoxia (8 h) and different periods of reoxygenation (20 and 40 min) on the oxidative balance in anterior and posterior gills of the crab Chasmagnathus granulata. Enzyme activity of catalase and GST was increased in the gills of the animals submitted to anoxia, and SOD activity was decreased. These enzymes returned approximately to control levels during the anoxia recovery time. These results demonstrated enzyme activities change with variations in environmental oxygen levels. The posterior gills showed a higher antioxidant enzyme activity than anterior gills. In the gills, there were no changes in the non-enzymatic antioxidant system (TRAP) during anoxia. On the other hand, during anoxia recovery, an increase of TRAP in both gills was observed. Anoxia does not change lipid peroxidation (TBARS) in the gills. During anoxia recuperation, an increase in levels of TBARS was observed. Thus the results demonstrate that C. granulata has a similar strategy of preparation for oxidative stress as observed in other intertidal species, enabling the crabs to survive in an environment with extreme variations in physical and chemical characteristics, such as salt marshes.
de Oliveira
Ubirajara O
UO
Laboratório de Metabolismo e Endocrinologia Comparada, Brazil.
da Rosa Araújo
Alex Sander
AS
Belló-Klein
Adriane
A
da Silva
Roselis S M
RS
Kucharski
Luiz Carlos
LC
D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D003386:Brachyura / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D004781:Environmental Exposure; D005880:Gills / Q000201:enzymology*; D005982:Glutathione Transferase / Q000378:metabolism; D000860:Hypoxia / Q000378:metabolism*; D015227:Lipid Peroxidation; D008297:Male; D018384:Oxidative Stress; D010100:Oxygen / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D000975:Antioxidants; D017382:Reactive Oxygen Species; D017392:Thiobarbituric Acid Reactive Substances; D002374:Catalase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D010100:Oxygen