Abstract
Heavy metals can lead to osmotic stress by disrupting the regulation of sodium ion in aquatic organisms. In this study, gene expression patterns and enzymatic activities of Na+/K+-ATPase in the monogonont rotifer, Brachionus koreanus were measured after exposure to different Cd (7.5, 15, and 30 mg/L), and Pb (0.1, 0.5, and 1.0 mg/L), respectively. As results, a significant increase in Bk Na+/K+-ATPase activity was observed after exposure to Cd and Pb in a concentration-dependent manner. Bk Na +/K +-ATPase mRNA level was significantly upregulated in the Cd-exposed group, whereas its level was reduced in the Pb-exposed group. These findings indicate that heavy metals could induce osmotic stress in B. koreanus, and Na+/K+-ATPase may be involved in cellular ho-meostasis in response to heavy metal exposure. This study is helpful for the understanding of the molecular mode of action of B. koreanus in response to heavy metals.
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