Cited by 95Genomics, phytochemicals, and oxidative stressPI3K/AKT/mTOR signaling in cancerNF-κB Signaling Pathways

Nrf2 Transcription Factor Can Directly Regulate mTOR

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Bendavit, Gabriel, Aboulkassim, Tahar, Hilmi, Khalid, Shah, Sujay, Batist, Gerald·2016·Journal of Biological Chemistry

Abstract

Nrf2 is a master transcription factor that regulates a wide variety of cellular proteins by recognizing and binding to antioxidant response elements (AREs) in their gene promoter regions. In this study we show that increasing cellular Nrf2 results in transcriptional activation of the gene for mTOR, which is central to the PI3K signaling pathway. This is the case in cells with normal physiological PI3K. However, in cells with abnormally active PI3K increased cellular Nrf2 levels have no effect on mTOR. ChIP assays results show that increased Nrf2 binding is associated with decreased p65 binding and H3-K27me3 signal (marker of gene repression) as well as increased H3-K4me3 signal (marker of gene activation). However, in cells with PI3K activation, no effect of cellular Nrf2 increase on mTOR transcription was observed. In these cells, increasing Nrf2 levels increases Nrf2 promoter binding marginally, whereas p65 binding and H3-K27me3 mark were significantly increased, and H3-K4me3 signal is reduced. Together, these data show for the first time that Nrf2 directly regulates mTOR transcription when the PI3K pathway is intact, whereas this function is lost when PI3K is activated. We have identified a link between the Nrf2 system of sensing environmental stress and mTOR, which is a key cellular protein in metabolism. Studies in cells with activating mutations in the PI3K pathway suggest that Nrf2 transcriptional regulation of mTOR is related to promoter binding of p65 and of methylation of histone residues permissive of transcription.

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Crossref · 10.1074/jbc.m116.760249

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  • Increased levels of Nrf2 can directly activate transcription of the mTOR gene and activate the PI3K signaling pathway, but only in cells with normal physiological PI3K activity.

    “However, recently an interesting study has shown that increased levels of Nrf2 can directly activate transcription of the mTOR gene and activate the PI3K signaling pathway. However, this happens only in cells that have a normal physiological PI3K activity (Bendavit et al., 2016).”

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Authors
Bendavit, G., Aboulkassim, T., Hilmi, K., Shah, S., & Batist, G.
Affiliations
Jewish General Hospital (CA)
Corresponding author
Batist, Gerald
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2016-12
Volume
291
Issue
49
Pages
25476-25488
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2540781052
Cited by
95
References
53
Citations by year
2026: 2 · 2025: 12 · 2024: 15 · 2023: 7 · 2022: 13 · 2021: 12 · 2020: 10 · 2019: 10 · 2018: 7 · 2017: 7
FWCI
4.16
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canadian Institutes of Health Research (MOP-126073)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
Nrf2, mTOR, PI3K signaling, transcriptional regulation, NF-κB p65, histone methylation, antioxidant response element, promoter binding, gene repression, cellular metabolism
MeSH terms
Gene Expression Regulation, Humans, Mutation, Oxidation-Reduction, Promoter Regions, Genetic, Signal Transduction, Phosphatidylinositol 3-Kinases, NF-E2-Related Factor 2, Transcription Factor RelA, TOR Serine-Threonine Kinases, MCF-7 Cells

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