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• W1612835954 abstract "Selenium contamination in the aquatic environment can produce severe toxic effects to fish. The mammalian sulfhydryl-containing enzyme, delta-aminolevulinate dehydratase (delta-ALA-D), is inhibited after exposure to organic and inorganic forms of selenium. In the present study, the inhibitory effect of (PhSe)2, (BuSe)2, and Na2SeO3 on the activity of fish hepatic and gill delta-ALA-D was investigated and compared with the rat liver enzyme. Results indicated that delta-ALA-D activity varied considerably depending on the tissue, selenium form, and species considered. For fish (liver and gill), the IC50 values for delta-ALA-D inhibition by (PhSe)2, (BuSe)2, and Na2SeO3 were 274 and 76, 985 and 693, and 386 and 902 microM, respectively. For rat liver these values were 7, 10, and 5 microM, respectively. In contrast, fish and rat subcellular fractions similarly increased the oxidative effect of (PhSe)2 toward sulfhydryl groups from DTT. These catalytic properties of subcellular fractions from fish and rat liver were abolished by heat treatment. Taking into account that aquatic organisms can be in contact with higher concentrations of selenium for longer periods of time and accumulate more selenium than terrestrial animals, it is reasonable to suppose that fish delta-ALA-D can be a potential target for organic and inorganic selenium forms present in aquatic contaminated environments. From an ecotoxicological point of view, our results suggest a link between selenium-induced anemia signs in fish and the sensitivity of fish delta-ALA-D to selenium in natural habitats." @default.
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• W1612835954 date "2005-05-01" @default.
• W1612835954 modified "2023-09-23" @default.
• W1612835954 title "Organic and inorganic forms of selenium inhibited differently fish (Rhamdia quelen) and rat (Rattus norvergicus albinus) δ-aminolevulinate dehydratase" @default.
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• W1612835954 doi "https://doi.org/10.1016/j.envres.2004.07.011" @default.
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