Crucial role of p53-dependent cellular senescence in suppression of Pten-deficient tumorigenesis Academic Article uri icon

Overview

MeSH Major

  • Cell Aging
  • Cell Transformation, Neoplastic
  • Phosphoric Monoester Hydrolases
  • Prostatic Neoplasms
  • Tumor Suppressor Protein p53
  • Tumor Suppressor Proteins

abstract

  • Cellular senescence has been theorized to oppose neoplastic transformation triggered by activation of oncogenic pathways in vitro, but the relevance of senescence in vivo has not been established. The PTEN and p53 tumour suppressors are among the most commonly inactivated or mutated genes in human cancer including prostate cancer. Although they are functionally distinct, reciprocal cooperation has been proposed, as PTEN is thought to regulate p53 stability, and p53 to enhance PTEN transcription. Here we show that conditional inactivation of Trp53 in the mouse prostate fails to produce a tumour phenotype, whereas complete Pten inactivation in the prostate triggers non-lethal invasive prostate cancer after long latency. Strikingly, combined inactivation of Pten and Trp53 elicits invasive prostate cancer as early as 2 weeks after puberty and is invariably lethal by 7 months of age. Importantly, acute Pten inactivation induces growth arrest through the p53-dependent cellular senescence pathway both in vitro and in vivo, which can be fully rescued by combined loss of Trp53. Furthermore, we detected evidence of cellular senescence in specimens from early-stage human prostate cancer. Our results demonstrate the relevance of cellular senescence in restricting tumorigenesis in vivo and support a model for cooperative tumour suppression in which p53 is an essential failsafe protein of Pten-deficient tumours.

publication date

  • August 4, 2005

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed Central ID

  • PMC1939938

Digital Object Identifier (DOI)

  • 10.1038/nature03918

PubMed ID

  • 16079851

Additional Document Info

start page

  • 725

end page

  • 30

volume

  • 436

number

  • 7051