J Biol Chem. 2001 Apr 13;276(15):11783-90. Epub 2001 Jan 24.

Role of ATM in oxidative stress-mediated c-Jun phosphorylation in response to ionizing radiation and CdCl2.

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Department of Radiation Medicine, Georgetown University Medical Center, Washington, D.C. 20007-2197, USA.

Abstract

Ionizing radiation-induced phosphorylation of the transcription factor c-Jun is impaired in cells derived from individuals with ataxia telangiectasia (AT), in which the ATM gene is mutated. We demonstrate here that ATM modulates c-Jun phosphorylation following exposure to ionizing radiation as well as treatment with CdCl(2), a potent pro-oxidant. Exposure of AT and control fibroblasts to CdCl(2) induced a biphasic increase in c-Jun phosphorylation on serine residues 63 and 73, with the extent of the second phase being markedly greater in AT cells than in control cells. Heme oxygenase-1, a marker of oxidative stress, was also significantly induced in AT fibroblasts. Expression of recombinant ATM in AT fibroblasts, however, reduced the extent of the effects of CdCl(2) on both c-Jun phosphorylation and heme oxygenase-1 induction. Our data suggest that ATM contributes to oxidative stress-mediated signaling that leads to c-Jun phosphorylation by acting as a sensor of ionizing radiation-induced oxidative stress and by modulating intracellular redox homeostasis.

PMID:: 11278277; [PubMed - indexed for MEDLINE]

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