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Increased Protein Stability as a Mechanism That Enhances Nrf2-mediated Transcriptional Activation of the Antioxidant Response Element
Open accessAbstract
Nrf2 (NF-E2-related factor 2) is a central transcription factor involved in the transcriptional activation of many genes encoding phase II drug-metabolizing enzymes via the antioxidant response element. Nrf2 has previously been found to undergo nuclear translocation by a phosphorylation-dependent mechanism mediated by protein kinase C in HepG2 cells treated with tert-butylhydroquinone, beta-naphthoflavone, or 12-O-tetradecanoylphorbol-13-acetate. In the present report, we have found that the levels of Nrf2 were increased in cells treated with tert-butylhydroquinone or beta-naphthoflavone by a post-transcriptional mechanism. Treatment of HepG2 cells with cycloheximide resulted in the loss of Nrf2 within 30 min. By contrast, treatment with the proteasome inhibitors (lactacystin or MG-132) caused an accumulation of Nrf2 as well as an induction of reporter gene activity in cells transfected with the GSTA2 antioxidant response element-chloramphenicol acetyl transferase construct. Similarly, the protein phosphatase inhibitor okadaic acid also caused an accumulation of Nrf2, whereas the reverse effects were observed with PD 98059 and U 0126, two compounds that block the activation of the MAPK/ERK signaling cascade. These data suggest that Nrf2 is degraded by the ubiquitin-dependent pathway and that phosphorylation of Nrf2 leads to an increase in its stability and subsequent transactivation activity.
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“Nrf2 regulates the expression of a multitude of antioxidant and phase II enzyme genes and is negatively regulated by Kelch-like ECH-associated protein (Keap1) [49], a substrate adaptor protein that binds to Nrf2 in the cytosol to facilitate its polyubiquitination by the Cullin 3 (Cul3) E3 ubiquitin ligase for proteasomal degradation [50,51,52].”
From Nrf2 and Oxidative Stress: A General Overview of Mechanisms and Implications in Human Disease (2022) · cites this paper as [50]
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“Under basal conditions, Nrf2 has a short half-life of only 10–30 min [50,77].”
From Nrf2 and Oxidative Stress: A General Overview of Mechanisms and Implications in Human Disease (2022) · cites this paper as [50]
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Metadata
- Authors
- Nguyen, T., Sherratt, P. J., Huang, H.-C., Yang, C. S., & Pickett, C. B.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- Corresponding author
- Pickett, Cecil B.
- ORCID
- Yang, Chung S.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2003-02
- Volume
- 278
- Issue
- 7
- Pages
- 4536-4541
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2080435498
- Cited by
- 615
- References
- 44
- Citations by year
- 2026: 15 · 2025: 13 · 2024: 24 · 2023: 25 · 2022: 29 · 2021: 25 · 2020: 24 · 2019: 31 · 2018: 23 · 2017: 24 · 2016: 29 · 2015: 31 · 2014: 21 · 2013: 31 · 2012: 36
- FWCI
- 12.29
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Keywords
- Nrf2, antioxidant response element, protein stability, ubiquitin-mediated proteolysis, Nrf2 phosphorylation, phase II enzymes, tert-butylhydroquinone, beta-naphthoflavone, proteasome inhibitors, ERK signaling, protein phosphatase, transcriptional activation, HepG2 cells
- MeSH terms
- Antioxidants, Butadienes, Cell Line, DNA-Binding Proteins, Enzyme Inhibitors, Flavonoids, Humans, Hydroquinones, Nitriles, Peptide Hydrolases, Phosphorylation, RNA Processing, Post-Transcriptional, Transcriptional Activation, Trans-Activators, Leucine Zippers, Oxidative Stress, beta-Naphthoflavone, Protein Subunits, Proteasome Endopeptidase Complex, NF-E2-Related Factor 2
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