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Tomiyasu H, Habara M, Hanaki S, Sato Y, Miki Y, Shimada M. FOXO1 promotes cancer cell growth through MDM2-mediated p53 degradation. J Biol Chem 2024; 300:107209. [PMID: 38519029 PMCID: PMC11021968 DOI: 10.1016/j.jbc.2024.107209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 03/07/2024] [Accepted: 03/13/2024] [Indexed: 03/24/2024] Open
Abstract
FOXO1 is a transcription factor and potential tumor suppressor that is negatively regulated downstream of PI3K-PKB/AKT signaling. Paradoxically, FOXO also promotes tumor growth, but the detailed mechanisms behind this role of FOXO are not fully understood. In this study, we revealed a molecular cascade by which the Thr24 residue of FOXO1 is phosphorylated by AKT and is dephosphorylated by calcineurin, which is a Ca2+-dependent protein phosphatase. Curiously, single nucleotide somatic mutations of FOXO1 in cancer occur frequently at and near Thr24. Using a calcineurin inhibitor and shRNA directed against calcineurin, we revealed that calcineurin-mediated dephosphorylation of Thr24 regulates FOXO1 protein stability. We also found that FOXO1 binds to the promoter region of MDM2 and activates transcription, which in turn promotes MDM2-mediated ubiquitination and degradation of p53. FOXO3a and FOXO4 are shown to control p53 activity; however, the significance of FOXO1 in p53 regulation remains largely unknown. Supporting this notion, FOXO1 depletion increased p53 and p21 protein levels in association with the inhibition of cell proliferation. Taken together, these results indicate that FOXO1 is stabilized by calcineurin-mediated dephosphorylation and that FOXO1 supports cancer cell proliferation by promoting MDM2 transcription and subsequent p53 degradation.
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Affiliation(s)
- Haruki Tomiyasu
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Makoto Habara
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Shunsuke Hanaki
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Yuki Sato
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Yosei Miki
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Midori Shimada
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi, Yamaguchi, Japan; Department of Molecular Biology, Nagoya University, Graduate School of Medicine, Showa-ku, Nagoya, Japan.
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Fahie KMM, Papanicolaou KN, Zachara NE. Integration of O-GlcNAc into Stress Response Pathways. Cells 2022; 11:3509. [PMID: 36359905 PMCID: PMC9654274 DOI: 10.3390/cells11213509] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/09/2022] Open
Abstract
The modification of nuclear, mitochondrial, and cytosolic proteins by O-linked βN-acetylglucosamine (O-GlcNAc) has emerged as a dynamic and essential post-translational modification of mammalian proteins. O-GlcNAc is cycled on and off over 5000 proteins in response to diverse stimuli impacting protein function and, in turn, epigenetics and transcription, translation and proteostasis, metabolism, cell structure, and signal transduction. Environmental and physiological injury lead to complex changes in O-GlcNAcylation that impact cell and tissue survival in models of heat shock, osmotic stress, oxidative stress, and hypoxia/reoxygenation injury, as well as ischemic reperfusion injury. Numerous mechanisms that appear to underpin O-GlcNAc-mediated survival include changes in chaperone levels, impacts on the unfolded protein response and integrated stress response, improvements in mitochondrial function, and reduced protein aggregation. Here, we discuss the points at which O-GlcNAc is integrated into the cellular stress response, focusing on the roles it plays in the cardiovascular system and in neurodegeneration.
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Affiliation(s)
- Kamau M. M. Fahie
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Kyriakos N. Papanicolaou
- Department of Medicine, Division of Cardiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Natasha E. Zachara
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Yan W, Cao M, Ruan X, Jiang L, Lee S, Lemanek A, Ghassemian M, Pizzo DP, Wan Y, Qiao Y, Chin AR, Duggan E, Wang D, Nolan JP, Esko JD, Schenk S, Wang SE. Cancer-cell-secreted miR-122 suppresses O-GlcNAcylation to promote skeletal muscle proteolysis. Nat Cell Biol 2022; 24:793-804. [PMID: 35469018 PMCID: PMC9107513 DOI: 10.1038/s41556-022-00893-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 03/10/2022] [Indexed: 01/18/2023]
Abstract
A decline in skeletal muscle mass and low muscular strength are prognostic factors in advanced human cancers. Here we found that breast cancer suppressed O-linked N-acetylglucosamine (O-GlcNAc) protein modification in muscle through extracellular-vesicle-encapsulated miR-122, which targets O-GlcNAc transferase (OGT). Mechanistically, O-GlcNAcylation of ryanodine receptor 1 (RYR1) competed with NEK10-mediated phosphorylation and increased K48-linked ubiquitination and proteasomal degradation; the miR-122-mediated decrease in OGT resulted in increased RYR1 abundance. We further found that muscular protein O-GlcNAcylation was regulated by hypoxia and lactate through HIF1A-dependent OGT promoter activation and was elevated after exercise. Suppressed O-GlcNAcylation in the setting of cancer, through increasing RYR1, led to higher cytosolic Ca2+ and calpain protease activation, which triggered cleavage of desmin filaments and myofibrillar destruction. This was associated with reduced skeletal muscle mass and contractility in tumour-bearing mice. Our findings link O-GlcNAcylation to muscular protein homoeostasis and contractility and reveal a mechanism of cancer-associated muscle dysregulation.
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Affiliation(s)
- Wei Yan
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA.
| | - Minghui Cao
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Xianhui Ruan
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Li Jiang
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Sylvia Lee
- Department of Orthopaedic Surgery, University of California, San Diego, La Jolla, CA, USA
| | - Adriana Lemanek
- Department of Orthopaedic Surgery, University of California, San Diego, La Jolla, CA, USA
| | - Majid Ghassemian
- Biomolecular and Proteomics Mass Spectrometry Facility, University of California, San Diego, La Jolla, CA, USA
| | - Donald P Pizzo
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Yuhao Wan
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Yueqing Qiao
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | - Andrew R Chin
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA
| | | | - Dong Wang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA, USA
| | | | - Jeffrey D Esko
- Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
- Glycobiology Research and Training Center, University of California, San Diego, La Jolla, CA, USA
| | - Simon Schenk
- Department of Orthopaedic Surgery, University of California, San Diego, La Jolla, CA, USA.
| | - Shizhen Emily Wang
- Department of Pathology, University of California, San Diego, La Jolla, CA, USA.
- Moores Cancer Center, University of California, San Diego, La Jolla, CA, USA.
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