Although a number of p53 target genes have been identified, the mechanisms of p53-dependent activities that determine cellular survival or death are still not fully understood. Here we report isolation of a novel p53 target gene, designated p53-inducible cell-survival factor (p53CSV). p53CSV contains a p53-binding site within its second exon and the reduction of expression by small interfering RNA enhanced apoptosis, whereas overexpression protected cells from apoptosis caused by DNA damage. p53CSV is induced significantly when cells have a low level of genotoxic stresses, but not when DNA damage is severe. p53CSV can modulate apoptotic pathways through interaction with Hsp70 that probably inhibits activity of apoptosis protease activating factor-1. Our results imply that under specific conditions of stress, p53 regulates transcription of p53CSV and that p53CSV is one of the important players in the p53-mediated cell survival.
Pubmed ID: 15735003 RIS Download
Mesh terms: Amino Acid Sequence | Apoptotic Protease-Activating Factor 1 | Caspase 9 | Caspase Inhibitors | Caspases | Cell Line, Tumor | Cell Survival | DNA Damage | Enzyme Activation | Gene Expression Regulation, Neoplastic | HCT116 Cells | HSP70 Heat-Shock Proteins | Humans | Intracellular Signaling Peptides and Proteins | Molecular Sequence Data | Proteins | Tumor Suppressor Protein p53
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