Cited by 369Autophagy in Disease and TherapyCell death mechanisms and regulationCancer, Hypoxia, and Metabolism

BNIP3 Is an RB/E2F Target Gene Required for Hypoxia-Induced Autophagy

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Tracy, Kristin, Dibling, Benjamin C., Spike, Benjamin T., Knabb, James R., Schumacker, Paul, Macleod, Kay F.·2007·Molecular and Cellular Biology

Abstract

Hypoxia and nutrient deprivation are environmental stresses governing the survival and adaptation of tumor cells in vivo. We have identified a novel role for the Rb tumor suppressor in protecting against nonapoptotic cell death in the developing mouse fetal liver, in primary mouse embryonic fibroblasts, and in tumor cell lines. Loss of pRb resulted in derepression of BNip3, a hypoxia-inducible member of the Bcl-2 superfamily of cell death regulators. We identified BNIP3 as a direct target of pRB/E2F-mediated transcriptional repression and showed that pRB attenuates the induction of BNIP3 by hypoxia-inducible factor to prevent autophagic cell death. BNIP3 was essential for hypoxia-induced autophagy, and its ability to promote autophagosome formation was enhanced under conditions of nutrient deprivation. Knockdown of BNIP3 reduced cell death, and remaining deaths were necrotic in nature. These studies identify BNIP3 as a key regulator of hypoxia-induced autophagy and suggest a novel role for the RB tumor suppressor in preventing nonapoptotic cell death by limiting the extent of BNIP3 induction in cells.

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Crossref · 10.1128/mcb.02246-06

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  • Functional RB may prevent autophagy in response to hypoxia through inhibition of E2F target genes.

    “Recent work has demonstrated that the presence of functional RB might prevent autophagy in response to hypoxia through its inhibition of E2F target genes97,98.”

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Authors
Tracy, K., Dibling, B. C., Spike, B. T., Knabb, J. R., Schumacker, P., & Macleod, K. F.
Affiliations
  • University of Chicago (US)
  • Northwestern University (US)
Corresponding author
Macleod, Kay F.
Venue
Molecular and Cellular Biology
Published
2007-09-01
Volume
27
Issue
17
Pages
6229-6242
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2122065834
Cited by
369
References
61
Citations by year
2026: 8 · 2025: 9 · 2024: 15 · 2023: 7 · 2022: 19 · 2021: 29 · 2020: 10 · 2019: 20 · 2018: 19 · 2017: 27 · 2016: 15 · 2015: 24 · 2014: 16 · 2013: 21 · 2012: 25
FWCI
19.72
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
Keywords
BNIP3, Rb tumor suppressor, E2F transcription factors, autophagic cell death, hypoxia-inducible factor, transcriptional repression, nutrient deprivation, non-apoptotic cell death, autophagosome formation, tumor cell survival
MeSH terms
Animals, Hypoxia, Autophagy, Base Sequence, Cells, Cultured, Deferoxamine, Gene Expression Regulation, Humans, Membrane Proteins, Molecular Sequence Data, Promoter Regions, Genetic, Proto-Oncogene Proteins, Retinoblastoma Protein, Sequence Alignment, Cell Death, Siderophores, Mice, Knockout, Mitochondrial Proteins, E2F Transcription Factors, Mice

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