PMID:9792801

Citation	Gladyshev, VN, Factor, VM, Housseau, F and Hatfield, DL (1998) Contrasting patterns of regulation of the antioxidant selenoproteins, thioredoxin reductase, and glutathione peroxidase, in cancer cells. Biochem. Biophys. Res. Commun. 251:488-93
Abstract	There is strong evidence that selenium protects against certain human cancers, but the underlying mechanism is unknown. Glutathione peroxidase (GPX1) and thioredoxin reductase (TR), the most abundant antioxidant selenium-containing proteins in mammals, have been implicated in this protection. We analyzed the expression of TR and GPX1 in the following model cancer systems: (1) liver tumors in TGFalpha/c-myc transgenic mice; (2) human prostate cell lines from normal and cancer tissues; and (3) p53-induced apoptosis in a human colon cancer cell line. TR was induced while GPX1 was repressed in malignancies relative to controls in transgenic mice and prostate cell lines. In the colon cell line, p53 expression resulted in elevated GPX1, but repressed TR. The data indicate that TR and GPX1 are regulated in a contrasting manner in the cancer systems tested and reveal the p53-dependent regulation of selenoprotein expression. The data suggest that additional studies on selenoprotein regulation in different cancers are required to evaluate future implementation of selenium as a dietary supplement in individuals at risk for developing certain cancers.
Links	PubMed Online version:10.1006/bbrc.1998.9495
Keywords	Animals; Apoptosis; Carcinoma, Hepatocellular/enzymology; Carcinoma, Hepatocellular/genetics; Cell Line; Colonic Neoplasms/enzymology; Colonic Neoplasms/genetics; Enzyme Induction; Epithelial Cells/enzymology; Gene Expression Regulation, Enzymologic; Gene Expression Regulation, Neoplastic; Genes, myc; Glutathione Peroxidase/biosynthesis; Glutathione Peroxidase/genetics; Humans; Liver Neoplasms/enzymology; Liver Neoplasms/genetics; Male; Mice; Mice, Inbred CBA; Mice, Transgenic; Prostate/enzymology; Prostatic Neoplasms/enzymology; Prostatic Neoplasms/genetics; Proto-Oncogene Proteins c-myc/genetics; Proto-Oncogene Proteins c-myc/physiology; Thioredoxin-Disulfide Reductase/biosynthesis; Thioredoxin-Disulfide Reductase/genetics; Transcription, Genetic; Transforming Growth Factor alpha/genetics; Transforming Growth Factor alpha/physiology; Tumor Cells, Cultured; Tumor Suppressor Protein p53/metabolism
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