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• W2029705149 abstract "The p53-transcriptional target TP53INP1 is a potent stress-response protein promoting p53 activity. We previously showed that ectopic overexpression of TP53INP1 facilitates cell cycle arrest as well as cell death. Here we report a study investigating cell death in mice deficient for TP53INP1. Surprisingly, we found enhanced stress-induced apoptosis in TP53INP1-deficient cells. This observation is underpinned in different cell types in vivo (thymocytes) and in vitro (thymocytes and MEFs), following different types of injury inducing either p53-dependent or -independent cell death. Nevertheless, absence of TP53INP1 is unable to overcome impaired cell death of p53-deficient thymocytes. Stress-induced ROS production is enhanced in the absence of TP53INP1, and antioxidant NAC complementation abolishes increased sensitivity to apoptosis of TP53INP1-deficient cells. Furthermore, antioxidant defenses are defective in TP53INP1-deficient mice in correlation with ROS dysregulation. Finally, we show that autophagy is reduced in TP53INP1-deficient cells both at the basal level and upon stress. Altogether, these data show that impaired ROS regulation in TP53INP1-deficient cells is responsible for their sensitivity to induced apoptosis. In addition, they suggest that this sensitivity could rely on a defect of autophagy. Therefore, these data emphasize the role of TP53INP1 in protection against cell injury." @default.
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• W2029705149 date "2011-09-15" @default.
• W2029705149 modified "2023-10-18" @default.
• W2029705149 title "Absence of Tumor Suppressor Tumor Protein 53-Induced Nuclear Protein 1 (TP53INP1) Sensitizes Mouse Thymocytes and Embryonic Fibroblasts to Redox-Driven Apoptosis" @default.
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• W2029705149 doi "https://doi.org/10.1089/ars.2010.3553" @default.
• W2029705149 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21235351" @default.
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