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• W2972707862 abstract "Sigma-1 receptor (S1R) regulates reactive oxygen species (ROS) accumulation via nuclear factor erythroid 2-related factor 2 (NRF2), which plays a vital role in ferroptosis. Sorafenib is a strong inducer of ferroptosis but not of apoptosis. However, the mechanism of sorafenib-induced ferroptosis in hepatocellular carcinoma (HCC) remains unclear. In this study, we found for the first time that sorafenib induced most of S1Rs away from nucleus compared to control groups in Huh-7 cells, and ferrostatin-1 completely blocked the translocation. S1R protein expression, but not mRNA expression, in HCC cells was significantly up-regulated by sorafenib. Knockdown of NRF2, but not of p53 or hypoxia-inducible factor 1-alpha (HIF1α), markedly induced S1R mRNA expression in HCC cells. Inhibition of S1R (by RNAi or antagonists) increased sorafenib-induced HCC cell death in vitro and in vivo. Knockdown of S1R blocked the expression of glutathione peroxidase 4 (GPX4), one of the core targets of ferroptosis, in vitro and in vivo. Iron metabolism and lipid peroxidation increased in the S1R knockdown groups treated with sorafenib compared to the control counterpart. Ferritin heavy chain 1 (FTH1) and transferrin receotor protein 1 (TFR1), both of which are critical for iron metabolism, were markedly up-regulated in HCC cells treated with erastin and sorafenib, whereas knockdown of S1R inhibited these increases. In conclusion, we demonstrate that S1R protects HCC cells against sorafenib and subsequent ferroptosis. A better understanding of the role of S1R in ferroptosis may provide novel insight into this biological process." @default.
• W2972707862 created "2019-09-19" @default.
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• W2972707862 date "2019-09-10" @default.
• W2972707862 modified "2023-10-11" @default.
• W2972707862 title "Sigma‐1 receptor protects against ferroptosis in hepatocellular carcinoma cells" @default.
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• W2972707862 doi "https://doi.org/10.1111/jcmm.14594" @default.
• W2972707862 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6815844" @default.
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• W2972707862 hasPublicationYear "2019" @default.
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