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- W2099579977 abstract "Abstract A monomethylated selenium metabolite, called methylseleninic acid (MSA), has recently been shown to cause global thiol redox modification of proteins. These changes represent a form of cellular stress due to protein misfolding or unfolding. An accumulation of aberrantly folded proteins in the endoplasmic reticulum (ER) triggers a defined set of transducers to correct the defects or commit the cells to apoptosis if the rescue effort is exhausted. Treatment of PC-3 human prostate cancer cells with MSA was found to induce a number of signature ER stress markers: (a) the survival/rescue molecules such as phosphorylated protein kinase–like ER-resident kinase (phospho-PERK), phosphorylated eukaryotic initiation factor-2α (phospho-eIF2α), glucose-regulated protein (GRP)-78, and GRP94; and (b) the apoptotic molecules such as caspase-12, caspase-7, and CAAT/enhancer binding protein homologous protein or growth arrest DNA damage-inducible gene 153 (CHOP/GADD153). Additional evidence suggested that CHOP/GADD153 might be an important transcription factor in apoptosis induction by MSA. In general, a higher concentration of MSA was required to elicit the apoptotic markers compared with the rescue markers. The apoptotic markers increased proportionally with the dose of MSA, whereas the rescue markers failed to keep pace with the increasing challenge from MSA. GRP78 is the rheostat of the ER stress transducers. In GRP78-overexpressing cells, the ability of MSA to up-regulate phospho-PERK, phospho-eIF2α, GRP94, caspase-12, caspase-7, and CHOP/GADD153 was significantly muted. A generous supply of GRP78 would allow cells to cope better with ER stress, thereby improving the odds for survival and negating the commitment to apoptotic death. The present study thus provides strong evidence to support an important role of ER stress response in mediating the anticancer effect of selenium." @default.
- W2099579977 created "2016-06-24" @default.
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- W2099579977 date "2005-10-01" @default.
- W2099579977 modified "2023-10-16" @default.
- W2099579977 title "Endoplasmic Reticulum Stress Signal Mediators Are Targets of Selenium Action" @default.
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- W2099579977 doi "https://doi.org/10.1158/0008-5472.can-05-2016" @default.
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