Involvement of the pathway phosphatidylinositol-3-kinase/AKT-1 in the establishment of the survival response to ionizing radiation

Amelia Cataldi, Giorgio Zauli, Roberta Di Pietro, Sergio Castorina, Rosalba Rana

Research output: Contribution to journalArticlepeer-review

Abstract

Ionizing radiation is one of the agents inducing activation of DNA repair, cell cycle arrest, apoptosis and cell death. Here we report evidence for an enhanced activity of DNA polymerase β, one of the repair enzymes, concomitant to the activation of the pathway phosphatidylinositol-3-kinase/AKT-1 (PI-3-kinase/AKT-1), which delivers a survival signal in Friend erythroleukemia cells exposed to 15 Gy. Significantly, the preincubation of the cells with PI-3-kinase inhibitors wortmannin and LY 294002, disactivating this pathway, sensitizes the cells to ionizing radiation by further reducing the rate of proliferation without substantial variations of the number of dead cells. Thus, we suggest a role for these enzymes in maintaining survival programs upon exposure to ionizing radiation and in giving to these cells a chance to recover from this stress.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalCellular Signalling
Volume13
Issue number5
DOIs
Publication statusPublished - May 2001

Keywords

  • AKT-1
  • Ionizing radiation
  • PI-3-kinase
  • Survival

ASJC Scopus subject areas

  • Cell Biology

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