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Menadione-induced Cytotoxicity Is Associated With Protein Thiol Oxidation And Alteration In Intracellular Ca2+ Homeostasis.
D. D. Di Monte, G. Bellomo, H. Thor, P. Nicotera, S. Orrenius
Published 1984 · Biology, Medicine
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The toxicological implications of alterations in intracellular thiol homeostasis during menadione metabolism have been investigated using freshly isolated rat hepatocytes. A strict correlation between depletion of protein sulfhydryl groups and loss of cell viability was observed. Loss of protein thiols preceded cell death, and occurred more rapidly in cells with decreased levels of reduced glutathione. Depletion of protein thiols was also associated with inhibition of Ca2+ efflux from the cells and perturbation of intracellular Ca2+ homeostasis. It is proposed that the oxidative stress induced by menadione metabolism in isolated hepatocytes results in the depletion of both soluble and protein thiols, and that the latter effect is critically associated with a perturbation of Ca2+ homeostasis and loss of cell viability.
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