Nrf2 is a direct PERK substrate and effector of PERK-dependent cell survival.

The Leonard and Madlyn Abramson Family Cancer Research Institute and Cancer Center, Department of Cancer Biology, University of Pennsylvania Cancer Center, Philadelphia, Pennsylvania 19104, USA.
Activation of PERK following the accumulation of unfolded proteins in the endoplasmic reticulum (ER) promotes translation inhibition and cell cycle arrest. PERK function is essential for cell survival following exposure of cells to ER stress, but the mechanisms whereby PERK signaling promotes cell survival are not thoroughly understood. We have identified the Nrf2 transcription factor as a novel PERK substrate. In unstressed cells, Nrf2 is maintained in the cytoplasm via association with Keap1. PERK-dependent phosphorylation triggers dissociation of Nrf2/Keap1 complexes and inhibits reassociation of Nrf2/Keap1 complexes in vitro. Activation of PERK via agents that trigger the unfolded protein response is both necessary and sufficient for dissociation of cytoplasmic Nrf2/Keap1 and subsequent Nrf2 nuclear import. Finally, we demonstrate that cells harboring a targeted deletion of Nrf2 exhibit increased cell death relative to wild-type counterparts following exposure to ER stress. Our data demonstrate that Nrf2 is a critical effector of PERK-mediated cell survival.
Mesh Terms:
Active Transport, Cell Nucleus, Animals, Annexin A5, Apoptosis, Blotting, Northern, Cell Cycle, Cell Nucleus, Cell Survival, Cytoplasm, DNA-Binding Proteins, Endoplasmic Reticulum, Genes, Reporter, Glutathione Transferase, Immunoblotting, Mice, Microscopy, Fluorescence, Models, Biological, NF-E2-Related Factor 2, NIH 3T3 Cells, Phosphorylation, Plasmids, Precipitin Tests, Protein Binding, Protein Biosynthesis, Protein Folding, Protein Transport, Signal Transduction, Subcellular Fractions, Time Factors, Trans-Activators, Transcription, Genetic, Two-Hybrid System Techniques, eIF-2 Kinase
Mol. Cell. Biol. Oct. 01, 2003; 23(20);7198-209 [PUBMED:14517290]
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