Cited by 463Genomics, phytochemicals, and oxidative stressHeme Oxygenase-1 and Carbon MonoxideUbiquitin and proteasome pathways

Degradation of transcription factor Nrf2 via the ubiquitin-proteasome pathway and stabilization by cadmium

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Stewart, Daniel, Killeen, Erin, Naquin, Ryan, Alam, Safdar, Alam, Jawed·2003·Journal of Biological Chemistry

Abstract

Nrf2 mediates inducer-dependent activation of the heme oxygenase-1 (HO-1) gene (Alam, J., Stewart, D., Touchard, C., Boinapally, S., Choi, A. M., and Cook, J. L. (1999) J. Biol. Chem. 274, 26071-26078), but the mechanism by which HO-1 inducers regulate Nrf2 function is not known. Treatment of mouse hepatoma (Hepa) cells with 50 microm CdCl(2) increased the amount of Nrf2 protein in a time-dependent manner; induction was observed within 30 min, prior to the accumulation of HO-1 mRNA. Cadmium did not significantly affect the steady-state level of Nrf2 mRNA or the initial rate of Nrf2 protein synthesis but increased the half-life of Nrf2 from approximately 13 to 100 min. Proteasome inhibitors, but not other protease inhibitors, enhanced the expression of Nrf2, and ubiquitinylated Nrf2 was detected after proteasome inhibition. Cycloheximide inhibited cadmium-stimulated Nrf2 expression and DNA binding activity and attenuated HO-1 mRNA accumulation. Conversely, proteasome inhibitors enhanced HO-1 mRNA and protein accumulation by a Nrf2-dependent mechanism. Together, these results indicate that Nrf2 is targeted for rapid degradation by the ubiquitin-proteasome pathway and that cadmium delays the rate of Nrf2 degradation leading to ho-1 gene activation.

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Authors
Stewart, D., Killeen, E., Naquin, R., Alam, S., & Alam, J.
Affiliations
  • Ochsner Medical Center (US)
  • Tulane University (US)
Corresponding author
Alam, Jawed
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-01
Volume
278
Issue
4
Pages
2396-2402
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2050512725
Cited by
463
References
48
Citations by year
2026: 8 · 2025: 11 · 2024: 12 · 2023: 15 · 2022: 17 · 2021: 23 · 2020: 17 · 2019: 14 · 2018: 15 · 2017: 15 · 2016: 14 · 2015: 12 · 2014: 30 · 2013: 18 · 2012: 27
FWCI
12.18
Type
journal article
Language
en
Open access
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 › Heme Oxygenase-1 and Carbon Monoxide
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
Nrf2, ubiquitin-proteasome system, cadmium, heme oxygenase-1, protein degradation, protein stabilization, proteasome inhibitors, cycloheximide, DNA-binding activity, metal-induced gene expression
MeSH terms
Animals, Cadmium, Cycloheximide, Cysteine Endopeptidases, DNA-Binding Proteins, Dose-Response Relationship, Drug, Multienzyme Complexes, Protein Binding, Protein Synthesis Inhibitors, RNA, RNA, Messenger, Time Factors, Tumor Cells, Cultured, Blotting, Western, Trans-Activators, Ubiquitin, Proteasome Endopeptidase Complex, NF-E2-Related Factor 2, Mice

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