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• W4361948927 abstract "<div>Abstract<p><b>Purpose:</b> Sensitive to apoptosis gene (SAG; also known as RBX2 or ROC2) was originally cloned as a redox-inducible antioxidant protein and was later characterized as a RING component of SCF E3 ubiquitin ligases. SAG overexpression inhibits apoptosis induced by many stimuli both <i>in vitro</i> and <i>in vivo</i>. SAG mRNA was overexpressed in human lung tumor tissues with a correlation to poor patient survival. To investigate whether SAG serves as an anticancer target, we determined the effect of SAG silencing on cell proliferation, survival, and radiosensitivity.</p><p><b>Experimental Design:</b> SAG protein expression in human tumors was evaluated by immunohistochemical staining using tumor tissue arrays. SAG expression in cancer cells was knocked down by siRNA silencing. The anticancer effects of SAG silencing were evaluated by <i>in vitro</i> assays for cell growth and survival and by an <i>in vivo</i> orthotopic xenograft tumor model. Radiosensitization by SAG silencing of human cancer cells was determined by clonogenic survival assay. Apoptosis induction was evaluated by fluorescence-activated cell sorting analysis, caspase-3 activation assay, and Western blotting of apoptosis-associated proteins.</p><p><b>Results:</b> SAG was overexpressed in multiple human tumor tissues compared with their normal counterparts. SAG silencing selectively inhibited cancer cell proliferation, suppressed <i>in vivo</i> tumor growth, and sensitized radiation-resistant cancer cells to radiation. Mechanistically, SAG silencing induced apoptosis with accumulation of NOXA, whereas SAG overexpression reduced NOXA levels and shortened NOXA protein half-life.</p><p><b>Conclusions:</b> The findings showed that SAG E3 ubiquitin ligase plays an essential role in cancer cell proliferation and tumor growth and may serve as a promising anticancer and radiosensitizing target. Clin Cancer Res; 16(3); 814–24</p></div>" @default.
• W4361948927 created "2023-04-05" @default.
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• W4361948927 date "2023-03-31" @default.
• W4361948927 modified "2023-10-18" @default.
• W4361948927 title "Data from Validation of SAG/RBX2/ROC2 E3 Ubiquitin Ligase as an Anticancer and Radiosensitizing Target" @default.
• W4361948927 doi "https://doi.org/10.1158/1078-0432.c.6517776.v1" @default.
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