5-Lipoxygenase regulates senescence-like growth arrest by promoting ROS-dependent p53 activation

Alfonso Catalano, Sabrina Rodilossi, Paola Caprari, Vincenzo Coppola, Antonio Procopio

Research output: Contribution to journalArticlepeer-review

Abstract

5-Lipoxygenase (5LO) is involved in the production of leukotrienes and reactive oxygen species (ROS) from arachidonic acid. Its strong activation has been associated with several diseases like cancer and neurodegeneration. Here we show that 5LO activity increases during senescence-like growth arrest induced by oncogenic ras or culture history in both human and mouse embryo fibroblasts. Overexpression of 5LO promotes senescence-like growth arrest via a p53/p21-dependent pathway, and this occurs independently of telomerase activity. 5LO stabilizes p53 through phosphorylation at Ser15 and increases expression of the p53-transcriptional target p21. This is achieved by regulating ROS production. Indeed, ROS are increased in 5LO-arrested cells. Antioxidants and a low oxygen environment prevent 5LO-induced growth arrest. Finally, 5LO inhibition reduces the growth arrest induced by oncogenic ras or culture history and these effects are neutralized by the addition of exogenous ROS. These data link the 5LO pathway to oxidative crises of primary fibroblast and suggest that the ability of 5LO to induce senescence-like growth arrest may be important in the pathogenesis of 5LO-associated disorders.

Original languageEnglish
Pages (from-to)170-179
Number of pages10
JournalEMBO Journal
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 12 2005

Keywords

  • 5-Lipoxygenase
  • Oncogenic ras
  • p53
  • Reactive oxygen species
  • Senescence

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

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