Abstract
We used immunocytochemical and fluorometric techniques to show that gill cells of two marine invertebrates, the crab Neohelice granulata (osmoregulator) and the clam Mesodesma mactroides (osmoconformer), increase the expression of membrane transporters [Na(+)/K(+)-ATPase and aquaporin (AQP1)] after whole-animals exposure (96h) to sublethal concentrations of copper in water of salinity 30ppt, when both clams and crabs are isosmotic with respect to the environmental medium. A plausible interpretation of our findings is that this increased expression in membrane transporters may serve as an attempt to ameliorate the deleterious effects of copper on the mechanisms involved in ion and volume regulation in gill cells.
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