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• W1963891946 abstract "Notch activity regulates tumor biology in a context-dependent and complex manner. Notch may act as an oncogene or a tumor-suppressor gene even within the same tumor type. Recently, Notch signaling has been implicated in cellular senescence. Yet, it remains unclear as to how cellular senescence checkpoint functions may interact with Notch-mediated oncogenic and tumor-suppressor activities. Herein, we used genetically engineered human esophageal keratinocytes and esophageal squamous cell carcinoma cells to delineate the functional consequences of Notch activation and inhibition along with pharmacological intervention and RNA interference experiments. When expressed in a tetracycline-inducible manner, the ectopically expressed activated form of Notch1 (ICN1) displayed oncogene-like characteristics inducing cellular senescence corroborated by the induction of G0/G1 cell-cycle arrest, Rb dephosphorylation, flat and enlarged cell morphology and senescence-associated β-galactosidase activity. Notch-induced senescence involves canonical CSL/RBPJ-dependent transcriptional activity and the p16INK4A-Rb pathway. Loss of p16INK4A or the presence of human papilloma virus (HPV) E6/E7 oncogene products not only prevented ICN1 from inducing senescence but permitted ICN1 to facilitate anchorage-independent colony formation and xenograft tumor growth with increased cell proliferation and reduced squamous-cell differentiation. Moreover, Notch1 appears to mediate replicative senescence as well as transforming growth factor-β-induced cellular senescence in non-transformed cells and that HPV E6/E7 targets Notch1 for inactivation to prevent senescence, revealing a tumor-suppressor attribute of endogenous Notch1. In aggregate, cellular senescence checkpoint functions may influence dichotomous Notch activities in the neoplastic context." @default.
• W1963891946 created "2016-06-24" @default.
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• W1963891946 date "2014-06-16" @default.
• W1963891946 modified "2023-09-27" @default.
• W1963891946 title "Cellular senescence checkpoint function determines differential Notch1-dependent oncogenic and tumor-suppressor activities" @default.
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• W1963891946 doi "https://doi.org/10.1038/onc.2014.169" @default.
• W1963891946 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4268095" @default.
• W1963891946 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24931169" @default.
• W1963891946 hasPublicationYear "2014" @default.
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