The B55α Subunit of PP2A Drives a p53-Dependent Metabolic Adaptation to Glutamine Deprivation
Open accessAbstract
Glutamine is an essential nutrient for cancer cell survival and proliferation, yet the signaling pathways that sense glutamine levels remain uncharacterized. Here, we report that the protein phosphatase 2A (PP2A)-associated protein, α4, plays a conserved role in glutamine sensing. α4 promotes assembly of an adaptive PP2A complex containing the B55α regulatory subunit via providing the catalytic subunit upon glutamine deprivation. Moreover, B55α is specifically induced upon glutamine deprivation in a ROS-dependent manner to activate p53 and promote cell survival. B55α activates p53 through direct interaction and dephosphorylation of EDD, a negative regulator of p53. Importantly, the B55α-EDD-p53 pathway is essential for cancer cell survival and tumor growth under low glutamine conditions in vitro and in vivo. This study delineates a previously unidentified signaling pathway that senses glutamine levels as well as provides important evidence that protein phosphatase complexes are actively involved in signal transduction.
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Upon glutamine starvation, p53 activity is induced and can help cancer cells adapt to nutrient starvation.
“Upon glutamine starvation, p53 activity is induced and can help cancer cells adapt to nutrient starvation through diverse mechanisms148.”
From Glutamine reliance in cell metabolism (2020) · cites this paper as [148]
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- Authors
- Reid, M. A., Wang, W.-I., Rosales, K. R., Welliver, M. X., Pan, M., & Kong, M.
- Affiliations
- City Of Hope National Medical Center (US)
- The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (US)
- Corresponding author
- Kong, Mei
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2013-04
- Volume
- 50
- Issue
- 2
- Pages
- 200-211
- ISSN
- 1097-2765 (ISSN-L)
- OpenAlex
- W1976712030
- Cited by
- 154
- References
- 30
- Citations by year
- 2026: 4 · 2025: 5 · 2024: 5 · 2023: 8 · 2022: 16 · 2021: 13 · 2020: 19 · 2019: 13 · 2018: 11 · 2017: 12 · 2016: 14 · 2015: 13 · 2014: 12 · 2013: 9
- FWCI
- 5.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Sidney Kimmel Foundation for Cancer Research
- Stop Cancer
- Stand Up To Cancer (SU2C-AACR-IRG0411)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Keywords
- protein phosphatase 2A, glutamine deprivation, p53 activation, EdD, reactive oxygen species, tumor cell survival, tumor growth
- MeSH terms
- Adaptation, Physiological, Animals, Cell Survival, Glutamine, Humans, Male, Mice, Nude, Neoplasm Transplantation, Neoplasms, Experimental, Phosphoproteins, Stress, Physiological, Signal Transduction, Transcriptional Activation, Gene Expression, Tumor Suppressor Protein p53, Reactive Oxygen Species, Molecular Chaperones, Catalytic Domain, Protein Subunits, RNA, Small Interfering, Intercellular Signaling Peptides and Proteins, NIH 3T3 Cells, Ubiquitin-Protein Ligases, Cell Line, Tumor, Tumor Burden, Adaptor Proteins, Signal Transducing, Cell Proliferation, Mice, Protein Phosphatase 2, Protein Multimerization, Gene Knockdown Techniques, HEK293 Cells
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