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- Title
Role for Prdx1 as a specific sensor in redox-regulated senescence in breast cancer.
- Authors
Turner-Ivey, B; Manevich, Y; Schulte, J; Kistner-Griffin, E; Jezierska-Drutel, A; Liu, Y; Neumann, C A
- Abstract
Recent studies suggest that Peroxiredoxin 1 (Prdx1), in addition to its known H2O2-scavenging function, mediates cell signaling through redox-specific protein-protein interactions. Our data illustrate how Prdx1 specifically coordinates p38MAPK-induced signaling through regulating p38MAPKα phosphatases in an H2O2 dose-dependent manner. MAPK phosphatases (MKP-1 and/or MKP-5), which are known to dephosphorylate and deactivate the senescence-inducing MAPK p38α, belong to a group of redox-sensitive phosphatases (protein tyrosine phosphatases) characterized by a low pKa cysteine in their active sites. We found that Prdx1 bound to both MKP-1 and MKP-5, but dissociated from MKP-1 when the Prdx1 peroxidatic cysteine Cys52 was over-oxidized to sulfonic acid, which in turn resulted in MKP-1 oxidation-induced oligomerization and inactivity toward p38MAPKα. Conversely, over-oxidation of Prdx1-Cys52 was enhancing in the Prdx1:MKP-5 complex with increasing amounts of H2O2 concentrations and correlated with a protection from oxidation-induced oligomerization and inactivation of MKP-5 so that activation toward p38MAPK was maintained. Further examination of this Prdx1-specific mechanism in a model of reactive oxygen species-induced senescence of human breast epithelial cells revealed the specific activation of MKP-5, resulting in decreased p38MAPKα activity. Taken together, our data suggest that Prdx1 orchestrates redox signaling in an H2O2 dose-dependent manner through the oxidation status of its peroxidatic cysteine Cys52.
- Subjects
PEROXIREDOXINS; DETECTORS; OXIDATION-reduction reaction; GENETIC regulation; CELLULAR aging; BREAST cancer; MITOGEN-activated protein kinase phosphatases
- Publication
Oncogene, 2013, Vol 32, Issue 45, p5302
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/onc.2012.624