Abstract
Selenium is increasingly recognized as a versatile anticarcinogenic agent. Its protective functions cannot be solely attributed to the action of glutathione peroxidase. Instead, selenium appears to operate by several mechanisms, depending on dosage and chemical form of selenium and the nature of the carcinogenic stress. In a major protective function, selenium is proposed to prevent the malignant transformation of cells by acting as a “redox switch” in the activation-inactivation of cellular growth factors and other functional proteins through the catalysis of oxidation-reduction reactions of critical SH groups or SS bonds. The growth-modulatory effects of selenium are dependent on the levels of intracellular GSH and the oxygen supply. In general, growth inhibition is achieved by the Se-mediated stimulation of cellular respiration. Selenium appears to inhibit the replication of tumor viruses and the activation of oncogenes by similar mechanisms. However, it may also alter carcinogen metabolism and protect DNA against carcinogen-induced damage. In additional functions of relevance to its anticarcinogenic activity, selenium acts as an acceptor of biogenic methyl groups, and is involved in the detoxification of metals and of certain xenobiotics. In its interactions with transformed cells at higher concentrations, it may induce effects ranging from metabolic and phenotypical changes, and partial renormalization to selective cytotoxicity owing to reversible or irreversible inhibition of protein and DNA synthesis. Selenium also has immunopotentiating properties. It is required for optimal macrophage and NK cell function. Its protective effects are influenced by synergistic and antagonistic dietary and environmental factors. The latter include a variety of toxic heavy metals and xenobiotic compounds, but they are also influenced by essential elements, such as zinc. The exposure to antagonistic factors must be minimized for the full expression of its anticarcinogenic potential.
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Schrauzer, G.N. Selenium. Biol Trace Elem Res 33, 51–62 (1992). https://doi.org/10.1007/BF02783992
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DOI: https://doi.org/10.1007/BF02783992