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• W2126264311 endingPage "83" @default.
• W2126264311 startingPage "975" @default.
• W2126264311 abstract "Normal human cells in culture become senescent after a limited number of population doublings. Senescent cells display characteristic changes in gene expression, among which is a repression of the ability to induce the c-fos gene. We have proposed a two-stage model for cellular senescence in which the mortality stage 1 (M1) mechanism can be overcome by agents that bind both the product of the retinoblastoma susceptibility gene (pRB)-like pocket proteins and p53. In this study we determined whether the repression of c-fos at M1 was downstream of the p53 or pRB-like arms of the M1 mechanism. We examined c-fos expression during the entire lifespan of normal human fibroblasts carrying E6 (which binds p53), E7 (which binds pRB), or both E6 and E7 of human papilloma virus type 16. The results indicate a dramatic change in cellular physiology at M1. Before M1, c-fos inducibility is controlled by an E6-independent mechanism that is blocked by E7. After M1, c-fos inducibility becomes dependent on E6 whereas E7 has no effect. In addition, a novel oscillation of c-fos expression with an approximately 2-h periodicity appears in E6-expressing fibroblasts post-M1. Accompanying this shift at M1 is a dramatic change in the ability to divide in low serum. Before M1, E6-expressing fibroblasts growth arrest in 0.3% serum, although they continue dividing under those conditions post-M1. These results demonstrate the unique physiology of fibroblasts during the extended lifespan between M1 and M2 and suggest that p53 might participate in the process that represses the c-fos gene at the onset of cellular senescence." @default.
• W2126264311 created "2016-06-24" @default.
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• W2126264311 creator A5022680361 @default.
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• W2126264311 date "1996-06-01" @default.
• W2126264311 modified "2023-10-16" @default.
• W2126264311 title "Age-dependent alterations of c-fos and growth regulation in human fibroblasts expressing the HPV16 E6 protein." @default.
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• W2126264311 doi "https://doi.org/10.1091/mbc.7.6.975" @default.
• W2126264311 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/275947" @default.
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• W2126264311 hasPublicationYear "1996" @default.
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