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• W2058173263 abstract "Endoplasmic reticulum (ER) stress occurs in poorly perfused tissues and activates the p53 isoform p53/47 to promote G2 arrest via 14-3-3σ. This contrasts with the p21CDKN1A-dependent G1 arrest caused by p53 following DNA damage. It is not known how cells respond to conditions when both pathways are activated. Here we show that p53/47 prevents p53-induced p21 transcription during ER stress and that both isoforms repress p21 mRNA translation. This prevents p21 from promoting COP1-mediated 14-3-3σ degradation and leads to G2 arrest. DNA damage does not result in p53-dependent induction of p21 during ER stress and instead results in an increase in p53-induced apoptosis. This illustrates how p53 isoforms target an intrinsic balance between the G1 and G2 checkpoints for cell cycle coordination and demonstrates an ER stress-dependent p53 pathway that suppresses p21 and lowers the apoptotic threshold to genotoxic drugs. DNA damage arrests the cell cycle in G1. Mlynarczyk et al.show that endoplasmic reticulum stress impairs DNA damage-induced p21 expression in favour of 14-3-3s-mediated G2 arrest by activating the p53 isoform p53/47, resulting in increased apoptosis in cells exposed to both stressors." @default.
• W2058173263 created "2016-06-24" @default.
• W2058173263 creator A5013133434 @default.
• W2058173263 creator A5063622901 @default.
• W2058173263 date "2014-10-08" @default.
• W2058173263 modified "2023-10-01" @default.
• W2058173263 title "Endoplasmic reticulum stress sensitizes cells to DNA damage-induced apoptosis through p53-dependent suppression of p21CDKN1A" @default.
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• W2058173263 doi "https://doi.org/10.1038/ncomms6067" @default.
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