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. 1996 Oct 15;93(21):11848–11852. doi: 10.1073/pnas.93.21.11848

Reactive oxygen species are downstream mediators of p53-dependent apoptosis.

T M Johnson 1, Z X Yu 1, V J Ferrans 1, R A Lowenstein 1, T Finkel 1
PMCID: PMC38147  PMID: 8876226

Abstract

Reactive oxygen species (ROS) have been implicated as potential modulators of apoptosis. Conversely, experiments under hypoxic conditions have suggested that apoptosis could occur in the absence of ROS. We sought to determine whether a central modulator of apoptosis, p53, regulates the levels of intracellular ROS and whether a rise in ROS levels is required for the induction of p53-dependent apoptosis. We transiently overexpressed wild-type p53, using adenoviral gene transfer, and identified cell types that were sensitive or resistant to p53-mediated apoptosis. Cells sensitive to p53-mediated apoptosis produced ROS concomitantly with p53 overexpression, whereas cells resistant to p53 failed to produce ROS. In sensitive cells, both ROS production and apoptosis were inhibited by antioxidant treatment. These results suggest that p53 acts to regulate the intracellular redox state and induces apoptosis by a pathway that is dependent on ROS production.

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