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- W2044200375 abstract "The stress protein hsp70 is part of the intracellular alarm and repair system which enables organisms to counteract negative effects of toxicants on protein integrity. Under long-term selection pressure exerted by environmental pollution, in particular heavy metals, this system may be expected to play a major role in the course of local, microevolutionary events leading to the acquisition of toxicant resistance. Seven clones of Daphnia magna from different geographical regions were characterized regarding their sensitivity to Cd, their hsp70 expression, and Cd accumulation. In an acute immobilisation assay, the tested clones showed remarkable differences in their sensitivity to Cd. The highest EC50 values by far were obtained for the clone displaying lowest hsp70 expression. In general, hsp70 levels reflected the order of sensitivity to Cd among the seven clones reciprocally. Clonal variations in sensitivity and hsp70 expression could not be related to differential accumulation of Cd, though. In summary, the association of stress insensitivity with low hsp70 induction which has been exemplarily reported for populations of different invertebrates under strong selection pressure could be affirmed for a largely parthenogenetic species for the first time. Furthermore, our observation has serious consequences for the interpretation of toxicological assays using a single D. magna clone solely." @default.
- W2044200375 created "2016-06-24" @default.
- W2044200375 creator A5031429415 @default.
- W2044200375 creator A5053145199 @default.
- W2044200375 date "2009-08-01" @default.
- W2044200375 modified "2023-10-08" @default.
- W2044200375 title "Cadmium tolerance in seven Daphnia magna clones is associated with reduced hsp70 baseline levels and induction" @default.
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- W2044200375 doi "https://doi.org/10.1016/j.aquatox.2009.06.006" @default.
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