Cited by 277FOXO transcription factor regulationCancer, Hypoxia, and MetabolismRedox biology and oxidative stress

FOXO3a Is Activated in Response to Hypoxic Stress and Inhibits HIF1-Induced Apoptosis via Regulation of CITED2

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Bakker, Walbert J., Harris, Isaac S., Mak, Tak W.·2007·Molecular Cell

Abstract

FOXO transcription factors are important regulators of cell survival in response to a variety of stress stimuli, among which are oxidative stress, DNA damage, and nutrient deprivation. Here we report a role for FOXO3a under conditions of hypoxic stress. In response to hypoxia, FOXO3a transcript levels accumulate in an HIF1-dependent way, resulting in enhanced FOXO3a activity. We show that transcription of CITED2, a transcriptional cofactor that functions in a negative feedback loop to control HIF1 activity, is induced by FOXO3a during hypoxia. In fibroblasts as well as in breast cancer cells, FOXO3a inhibits HIF1-induced apoptosis by stimulating the transcription of CITED2, which results in reduced expression of the proapoptotic HIF1 target genes NIX and RTP801. Thus, by fine-tuning HIF1 activity, FOXO3a plays an important role in the survival response of normal and cancer cells in response to hypoxic stress.

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Crossref · 10.1016/j.molcel.2007.10.035

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  • FOXO3a regulates expression of HIF-1α transcriptional inhibitor CITED2.

    “Previous reports have demonstrated that the increase in ROS in the absence of SirT3 inhibits FOXO3a activity (Sundaresan et al., 2009) and FOXO3a regulates expression of the HIF-1α transcriptional inhibitor CITED2 (Bakker et al., 2007), thus it is possible that CITED2 may have a role in our results.”

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Authors
Bakker, W. J., Harris, I. S., & Mak, T. W.
Affiliations
University Health Network (CA)
Corresponding author
Mak, Tak W.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2007-12
Volume
28
Issue
6
Pages
941-953
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2035991083
Cited by
277
References
62
Citations by year
2026: 7 · 2025: 10 · 2024: 7 · 2023: 10 · 2022: 10 · 2021: 18 · 2020: 12 · 2019: 19 · 2018: 13 · 2017: 15 · 2016: 15 · 2015: 15 · 2014: 14 · 2013: 22 · 2012: 17
FWCI
7.28
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
Johnson and Johnson
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › FOXO transcription factor regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
FOXO3, hypoxia, HIF-1, CITED2, apoptosis, transcriptional cofactors, negative feedback loop, Nix, RTP801, breast cancer cells, fibroblasts, cell survival, transcriptional regulation
MeSH terms
Forkhead Box Protein O3, Phosphoinositide-3 Kinase Inhibitors, Animals, Binding Sites, Cell Line, Cell Survival, Chromones, DNA-Binding Proteins, Fibroblasts, Flow Cytometry, Gene Expression Regulation, Humans, Models, Biological, Morpholines, Mutation, Repressor Proteins, RNA, Messenger, Transfection, Blotting, Western, Trans-Activators, Cell Hypoxia, Apoptosis, RNA, Small Interfering, NIH 3T3 Cells, Cell Line, Tumor, Mice, Hypoxia-Inducible Factor 1, Forkhead Transcription Factors, Embryonic Stem Cells

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