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• W2933254992 abstract "The radiosensitivity of the normal intestinal epithelium is the major limiting factor for definitive radiotherapy against abdominal malignancies. Radiosensitizers, which can be used without augmenting radiation toxicity to normal tissue, are still an unmet need. Inhibition of proteosomal degradation is being developed as a major therapeutic strategy for anticancer therapy as cancer cells are more susceptible to proteasomal inhibition-induced cytotoxicity compared with normal cells. Auranofin, a gold-containing antirheumatoid drug, blocks proteosomal degradation by inhibiting deubiquitinase inhibitors. In this study, we have examined whether auranofin selectively radiosensitizes colon tumors without promoting radiation toxicity in normal intestine.The effect of auranofin (10 mg/kg i.p.) on the radiation response of subcutaneous CT26 colon tumors and the normal gastrointestinal epithelium was determined using a mouse model of abdominal radiation. The effect of auranofin was also examined in a paired human colonic organoid system using malignant and nonmalignant tissues from the same patient.Both in the mouse model of intestinal injury and in the human nonmalignant colon organoid culture, auranofin pretreatment prevented radiation toxicity and improved survival with the activation of p53/p21-mediated reversible cell-cycle arrest. However, in a mouse model of abdominal tumor and in human malignant colonic organoids, auranofin inhibited malignant tissue growth with inhibition of proteosomal degradation, induction of endoplasmic reticulum stress/unfolded protein response, and apoptosis.Our data suggest that auranofin is a potential candidate to be considered as a combination therapy with radiation to improve therapeutic efficacy against abdominal malignancies." @default.
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• W2933254992 date "2019-08-01" @default.
• W2933254992 modified "2023-10-10" @default.
• W2933254992 title "Auranofin Protects Intestine against Radiation Injury by Modulating p53/p21 Pathway and Radiosensitizes Human Colon Tumor" @default.
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• W2933254992 doi "https://doi.org/10.1158/1078-0432.ccr-18-2751" @default.
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