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- W2044134416 abstract "p53 is required for the induction of a G(1) and/or G(2) irreversible arrest after gamma irradiation (IR), whereas blocked DNA replication causes a p53-independent S-phase arrest. We have examined the response to p53 when DNA synthesis is blocked by hydroxyurea (HU) or aphidicolin or when DNA is damaged by gamma IR. Similarly to gamma IR, blocked DNA synthesis induces high levels of phosphorylated nuclear p53. Surprisingly, several (but not all) p53 transcriptional targets that are rapidly induced by gamma IR are weakly or not induced when DNA replication is blocked. Moreover, the p53 response to gamma IR is inhibited by pretreatment of cells with HU or aphidicolin, suggesting that blocked DNA replication prevents p53 from being fully active as a transcription factor. HU-induced stabilization of p53 neither requires functional ATM (ataxia telangiectasia mutated), nor interferes with the gamma IR-dependent activation of the ATM kinase. Thus, stalled replication forks activate kinases that modify and stabilize p53, yet act downstream of ATM to impair p53 transcriptional activity. The ramifications of this novel regulation of p53 are discussed." @default.
- W2044134416 created "2016-06-24" @default.
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- W2044134416 date "2001-01-23" @default.
- W2044134416 modified "2023-10-14" @default.
- W2044134416 title "From the Cover: p53 accumulates but is functionally impaired when DNA synthesis is blocked" @default.
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- W2044134416 doi "https://doi.org/10.1073/pnas.021282898" @default.
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