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• W2019966704 abstract "Ions of metals such as mercury, cadmium and copper are known to exhibit a high affinity for thiol groups and may therefore severely disturb many metabolic functions in the cell. The aim of the present study was to identify the most sensitive changes of thiol metabolism induced by the addition of low concentrations of metal ions in order to elucidate the mechanisms of metal-toxicity. The effects on thiol metabolism by copper ions seemed to differ from that of mercury and cadmium ions. Copper ions exhibited mainly two effects that were different from those of mercury and cadmium ions. They lowered the reduced fractions of thiols and increased the release of homocysteine into the medium, whereas mercury and cadmium ions mainly influenced the metabolism of glutathione by increasing its synthesis. Even 0.1 micromol/l of copper ions increased the release of homocysteine in HeLa cell lines. An increased cellular concentration of glutathione and an increased release of glutathione into the medium were observed after addition of mercury and cadmium ions at a concentration of 1 micromol/l, which is just above the toxicity limit in human blood. The different cell lines varied in some respects in their response to the addition of metal ions. Cadmium ions had no effect on thiol metabolism in endothelial cell lines, and copper ions did not significantly increase the release of homocysteine into the medium in hepatoma cell lines. Furthermore, the metabolism of thiols during basal conditions (without the addition of metal ions) differed somewhat in the three cell lines investigated. One example is the low amount of extracellular glutathione in hepatoma cell lines, which probably was due to its rapid degradation to cysteinylglycine by gamma-glutamyl-transpeptidase." @default.
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• W2019966704 date "1998-04-01" @default.
• W2019966704 modified "2023-10-18" @default.
• W2019966704 title "Alterations of thiol metabolism in human cell lines induced by low amounts of copper, mercury or cadmium ions" @default.
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• W2019966704 doi "https://doi.org/10.1016/s0300-483x(98)00016-x" @default.
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