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• W2013864706 abstract "In normal cells, p53 protein is maintained at low levels, but the levels increase after stress or inappropriate growth signals to coordinate growth arrest or apoptosis. Human mammary epithelial cells (HMECs) are unusual in that they exhibit two phases of growth. The second growth phase, referred to as post-selection, follows a period of temporary growth arrest and is characterized by the absence of p16INK4a (also known as CDK4I and p16-INK4a) expression. Previously, we observed that post-selection HMECs have elevated levels of p53. Exogenous p16INK4a expression decreased levels of both p53 transcript and protein, and this effect was inhibited by nutlin-3a, indicating that p16INK4a can regulate p53 expression by affecting both p53 transcription and Mdm2-dependent degradation of p53. The p53 in post-selection HMECs was wild type and, as expected, increased p53 expression was associated with elevated p21WAF1/CIP1 and Mdm2 levels; the p53 response to DNA damage seemed normal. Despite elevated levels of wild-type p53 and p21WAF1/CIP1, post-selection cells grew more rapidly than their pre-selection HMEC precursors. We found that the post-selection HMECs contain a truncated Mdm2 protein (p60), which presumably lacks the p53 ubiquitylation domain. We propose that the increased levels of p53 in post-selection HMECs are due to the presence of an Mdm2 fragment that binds p53 but does not result in its degradation." @default.
• W2013864706 created "2016-06-24" @default.
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• W2013864706 date "2009-08-15" @default.
• W2013864706 modified "2023-09-25" @default.
• W2013864706 title "Normal human mammary epithelial cells proliferate rapidly in the presence of elevated levels of the tumor suppressors p53 and p21WAF1/CIP1" @default.
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• W2013864706 doi "https://doi.org/10.1242/jcs.044107" @default.
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