Cited by 3,999Genomics, phytochemicals, and oxidative stressGlutathione Transferases and PolymorphismsPharmacogenetics and Drug Metabolism

An Nrf2/Small Maf Heterodimer Mediates the Induction of Phase II Detoxifying Enzyme Genes through Antioxidant Response Elements

Itoh, Ken, Chiba, Tomoki, Takahashi, Satoru, Ishii, Tetsuro, Igarashi, Kazuhiko, Katoh, Yasutake, Oyake, Tatsuya, Hayashi, Norio +4 more·1997·Biochemical and Biophysical Research Communications

Abstract

The induction of phase II detoxifying enzymes is an important defense mechanism against intake of xenobiotics. While this group of enzymes is believed to be under the transcriptional control of antioxidant response elements (AREs), this contention is experimentally unconfirmed. Since the ARE resembles the binding sequence of erythroid transcription factor NF-E2, we investigated the possibility that the phase II enzyme genes might be regulated by transcription factors that also bind to the NF-E2 sequence. The expression profiles of a number of transcription factors suggest that an Nrf2/small Maf heterodimer is the most likely candidate to fulfill this role in vivo. To directly test these questions, we disrupted the murine nrf2 gene in vivo. While the expression of phase II enzymes (e.g., glutathione S-transferase and NAD(P)H: quinone oxidoreductase) was markedly induced by a phenolic antioxidant in vivo in both wild type and heterozygous mutant mice, the induction was largely eliminated in the liver and intestine of homozygous nrf2-mutant mice. Nrf2 was found to bind to the ARE with high affinity only as a heterodimer with a small Maf protein, suggesting that Nrf2/small Maf activates gene expression directly through the ARE. These results demonstrate that Nrf2 is essential for the transcriptional induction of phase II enzymes and the presence of a coordinate transcriptional regulatory mechanism for phase II enzyme genes. The nrf2-deficient mice may prove to be a very useful model for the in vivo analysis of chemical carcinogenesis and resistance to anti-cancer drugs.

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Crossref · 10.1006/bbrc.1997.6943

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Authors
Itoh, K., Chiba, T., Takahashi, S., Ishii, T., Igarashi, K., Katoh, Y., Oyake, T., Hayashi, N., Satoh, K., Hatayama, I., Yamamoto, M., & Nabeshima, Y.-I.
Affiliations
  • University of Tsukuba (JP)
  • Japan Science and Technology Agency (JP)
  • Tohoku University (JP)
  • Hirosaki University (JP)
  • National Institute of Neuroscience (JP)
Corresponding author
Yamamoto, Masayuki
Venue
Biochemical and Biophysical Research Communications
Publisher
Elsevier BV
Published
1997-07
Volume
236
Issue
2
Pages
313-322
ISSN
0006-291X (ISSN-L)
OpenAlex
W1991631628
Cited by
3,999
References
49
Citations by year
2026: 138 · 2025: 154 · 2024: 165 · 2023: 187 · 2022: 196 · 2021: 222 · 2020: 257 · 2019: 224 · 2018: 197 · 2017: 236 · 2016: 227 · 2015: 194 · 2014: 169 · 2013: 206 · 2012: 160
FWCI
8.67
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical and Biophysical Research Communications (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science (RFTF96I00202)
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 › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
Keywords
Nrf2, heterodimer, antioxidant response element, phase II enzymes, transcriptional regulation, Nrf2 knockout mice, glutathione S-transferase, NAD(P)H:quinone oxidoreductase, NF-E2, phenolic antioxidants, xenobiotic metabolism, chemical carcinogenesis, drug resistance
MeSH terms
Animals, Binding Sites, Butylated Hydroxyanisole, DNA-Binding Proteins, Glutathione Transferase, Heterozygote, Homozygote, Intestines, Liver, Male, Promoter Regions, Genetic, Quinone Reductases, Transcription Factors, Xenobiotics, Trans-Activators, Gene Expression Regulation, Enzymologic, Mice, Knockout, DNA Adducts, Dimerization, NF-E2-Related Factor 2, Mice

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