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  • Original Paper
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p53 induces the expression of its antagonist p73ΔN, establishing an autoregulatory feedback loop

Oncogene volume 21, pages 4715–4727 (2002)Cite this article

Abstract

The p53 tumor suppressor protein activates transcription and induces cell death. A close homologue of p53, termed p73, is expressed in transactivating (TA) forms that induce growth arrest and apoptosis much like p53. However, the p73 gene contains a second promoter, giving rise to the expression of p73ΔN, a species of p73 proteins that lack the N-terminal transactivation domain. We show here that the expression of p73ΔN is induced by p53 on the mRNA and protein level. The promoter that regulates p73ΔN expression in human cells was cloned and found to be activated by p53, as well as by p73TA, directly through a specific DNA element. The p73ΔN proteins, that are thereby expressed, bound to p53-responsive promoter DNA, competed with p53 for DNA binding, antagonized the activation of transcription by p53, and prevented p53-induced cell death. In addition, a transcriptional repressor domain was identified within the splicing variant p73ΔNα. The combination of p73ΔNα and mdm2 antagonized p53 more strongly than either p73Nα or mdm2 alone. Blocking endogenous p73ΔN by a trans dominant fragment, or its removal by siRNA, increased the activity of a p53-responsive promoter in cells that contain a wild type p53 gene. Thus, the induction of p73ΔN expression by p53 establishes an autoregulatory feedback loop that keeps the trigger of cell death under tight control.

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Acknowledgements

We thank H-D Klenk and R Arnold for continuous support. We are indebted to A Berk, AJ Levine and B Vogelstein for the generous gift of plasmids, antibodies and cells. We also thank J Flint for antibodies; D Caput and W Kaelin for plasmids; W Deppert and S Dehde for early passage H1299 cells; A Shakeri and A Brand for LS174T cells; H Christiansen and B Berwanger for SH-IP cells; T Tuschl for helpful advice regarding siRNA; P Koch for adenovirus vectors; and U Hobom for critically reading the manuscript. This work was supported by the German Research Foundation and the PE Kempkes Foundation. A Contente received the fellowship BD 21601/99 from PRAXIS XXI, FCT, Portugal.

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Authors and Affiliations

  1. Institut für Virologie, Philipps-Universität Marburg, Robert Koch Str. 17, Marburg, 35037, Germany

    Natalia N Kartasheva, Ana Contente, Claudia Lenz-Stöppler & Matthias Dobbelstein

  2. Abteilung Gastroenterologie und Stoffwechsel, Klinikum der Philipps-Universität Marburg, Baldingerstraße, Marburg, 35043, Germany

    Judith Roth

  3. Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 46, Moscow, 123182, Russia

    Natalia N Kartasheva

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  1. Natalia N Kartasheva
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Correspondence to Matthias Dobbelstein.

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Kartasheva, N., Contente, A., Lenz-Stöppler, C. et al. p53 induces the expression of its antagonist p73ΔN, establishing an autoregulatory feedback loop. Oncogene 21, 4715–4727 (2002). https://doi.org/10.1038/sj.onc.1205584

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