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Livneh I, Fabre B, Goldhirsh G, Lulu C, Zinger A, Shammai Vainer Y, Kaduri M, Dahan A, Ziv T, Schroeder A, Ben-Neriah Y, Zohar Y, Cohen-Kaplan V, Ciechanover A. Inhibition of nucleo-cytoplasmic proteasome translocation by the aromatic amino acids or silencing Sestrin3-their sensing mediator-is tumor suppressive. Cell Death Differ 2024:10.1038/s41418-024-01370-x. [PMID: 39266717 DOI: 10.1038/s41418-024-01370-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 08/11/2024] [Accepted: 08/27/2024] [Indexed: 09/14/2024] Open
Abstract
The proteasome, the catalytic arm of the ubiquitin system, is regulated via its dynamic compartmentation between the nucleus and the cytoplasm, among other mechanisms. Under amino acid shortage, the proteolytic complex is translocated to the cytoplasm, where it stimulates proteolysis to supplement recycled amino acids for essential protein synthesis. This response is mediated via the mTOR pathway and the lack of the three aromatic amino acids Tyr, Trp, and Phe (YWF). mTOR activation by supplementation of the triad inhibits proteasome translocation, leading to cell death. We now show that tumoral inherent stress conditions result in translocation of the proteasome from the nucleus to the cytosol. We further show that the modulation of the signaling cascade governed by YWF is applicable also to non-starved cells by using higher concentration of the triad to achieve a surplus relative to all other amino acids. Based on these two phenomena, we found that the modulation of stress signals via the administration of YWF leads to nuclear proteasome sequestration and inhibition of growth of xenograft, spontaneous, and metastatic mouse tumor models. In correlation with the observed effect of YWF on tumors, we found - using transcriptomic and proteomic analyses - that the triad affects various cellular processes related to cell proliferation, migration, and death. In addition, Sestrin3-a mediator of YWF sensing upstream of mTOR-is essential for proteasome translocation, and therefore plays a pro-tumorigenic role, positioning it as a potential oncogene. This newly identified approach for hijacking the cellular "satiety center" carries therefore potential therapeutic implications for cancer.
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Affiliation(s)
- Ido Livneh
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel.
- Institute of Pathology and Cytology, Rambam Health Care Campus, Haifa, Israel.
| | - Bertrand Fabre
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
- Laboratoire de Recherche en Sciences Végétales, UMR5546, Université de Toulouse 3, INP, CNRS, Auzeville-Tolosane, France
| | - Gilad Goldhirsh
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
| | - Chen Lulu
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
| | - Adar Zinger
- The Lautenberg Center for Immunology and Cancer Research, Institute of Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Yael Shammai Vainer
- The Louis Family Laboratory for Targeted Drug Delivery and Personalized Medicine Technologies, Faculty of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Maya Kaduri
- The Louis Family Laboratory for Targeted Drug Delivery and Personalized Medicine Technologies, Faculty of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Aviva Dahan
- Institute of Pathology and Cytology, Rambam Health Care Campus, Haifa, Israel
| | - Tamar Ziv
- Smoler Proteomic Center, Faculty of Biology, Technion-Israel Institute of Technology, Haifa, Israel
| | - Avi Schroeder
- The Louis Family Laboratory for Targeted Drug Delivery and Personalized Medicine Technologies, Faculty of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Yinon Ben-Neriah
- The Lautenberg Center for Immunology and Cancer Research, Institute of Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Yaniv Zohar
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
- Institute of Pathology and Cytology, Rambam Health Care Campus, Haifa, Israel
| | - Victoria Cohen-Kaplan
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel
| | - Aaron Ciechanover
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, Israel.
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Neeman-Egozi S, Livneh I, Dolgopyat I, Nussinovitch U, Milman H, Cohen N, Eisen B, Ciechanover A, Binah O. Stress-Induced Proteasome Sub-Cellular Translocation in Cardiomyocytes Causes Altered Intracellular Calcium Handling and Arrhythmias. Int J Mol Sci 2024; 25:4932. [PMID: 38732146 PMCID: PMC11084437 DOI: 10.3390/ijms25094932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 04/18/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
The ubiquitin-proteasome system (UPS) is an essential mechanism responsible for the selective degradation of substrate proteins via their conjugation with ubiquitin. Since cardiomyocytes have very limited self-renewal capacity, as they are prone to protein damage due to constant mechanical and metabolic stress, the UPS has a key role in cardiac physiology and pathophysiology. While altered proteasomal activity contributes to a variety of cardiac pathologies, such as heart failure and ischemia/reperfusion injury (IRI), the environmental cues affecting its activity are still unknown, and they are the focus of this work. Following a recent study by Ciechanover's group showing that amino acid (AA) starvation in cultured cancer cell lines modulates proteasome intracellular localization and activity, we tested two hypotheses in human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs, CMs): (i) AA starvation causes proteasome translocation in CMs, similarly to the observation in cultured cancer cell lines; (ii) manipulation of subcellular proteasomal compartmentalization is associated with electrophysiological abnormalities in the form of arrhythmias, mediated via altered intracellular Ca2+ handling. The major findings are: (i) starving CMs to AAs results in proteasome translocation from the nucleus to the cytoplasm, while supplementation with the aromatic amino acids tyrosine (Y), tryptophan (W) and phenylalanine (F) (YWF) inhibits the proteasome recruitment; (ii) AA-deficient treatments cause arrhythmias; (iii) the arrhythmias observed upon nuclear proteasome sequestration(-AA+YWF) are blocked by KB-R7943, an inhibitor of the reverse mode of the sodium-calcium exchanger NCX; (iv) the retrograde perfusion of isolated rat hearts with AA starvation media is associated with arrhythmias. Collectively, our novel findings describe a newly identified mechanism linking the UPS to arrhythmia generation in CMs and whole hearts.
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Affiliation(s)
- Shunit Neeman-Egozi
- Department of Physiology, Biophysics and Systems Biology, Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa 3190601, Israel; (S.N.-E.); (B.E.)
| | - Ido Livneh
- The Rappaport-Technion Integrated Cancer Center (R-TICC) and The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 319060, Israel; (I.L.); (N.C.)
| | - Irit Dolgopyat
- Department of Physiology, Biophysics and Systems Biology, Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa 3190601, Israel; (S.N.-E.); (B.E.)
| | - Udi Nussinovitch
- Department of Cardiology, Edith Wolfson Medical Center, Holon 5822012, Israel
- The Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Helena Milman
- Department of Physiology, Biophysics and Systems Biology, Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa 3190601, Israel; (S.N.-E.); (B.E.)
| | - Nadav Cohen
- The Rappaport-Technion Integrated Cancer Center (R-TICC) and The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 319060, Israel; (I.L.); (N.C.)
| | - Binyamin Eisen
- Department of Physiology, Biophysics and Systems Biology, Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa 3190601, Israel; (S.N.-E.); (B.E.)
| | - Aaron Ciechanover
- The Rappaport-Technion Integrated Cancer Center (R-TICC) and The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 319060, Israel; (I.L.); (N.C.)
| | - Ofer Binah
- Department of Physiology, Biophysics and Systems Biology, Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa 3190601, Israel; (S.N.-E.); (B.E.)
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Lazar I, Livneh I, Ciechanover A, Fabre B. Tryptophanyl-Transfer RNA Synthetase Is Involved in a Negative Feedback Loop Mitigating Interferon-γ-Induced Gene Expression. Cells 2024; 13:180. [PMID: 38247871 PMCID: PMC10813977 DOI: 10.3390/cells13020180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 01/12/2024] [Accepted: 01/16/2024] [Indexed: 01/23/2024] Open
Abstract
Aminoacyl-tRNA synthetases (aaRSs) are essential enzymes responsible for linking a transfer RNA (tRNA) with its cognate amino acid present in all the kingdoms of life. Besides their aminoacyl-tRNA synthetase activity, it was described that many of these enzymes can carry out non-canonical functions. They were shown to be involved in important biological processes such as metabolism, immunity, development, angiogenesis and tumorigenesis. In the present work, we provide evidence that tryptophanyl-tRNA synthetase might be involved in a negative feedback loop mitigating the expression of certain interferon-γ-induced genes. Mining the available TCGA and Gtex data, we found that WARS was highly expressed in cutaneous melanoma (SKCM) compared to other cancers and is of good prognosis for this particular cancer type. WARS expression correlates with genes involved in antigen processing and presentation but also transcription factors involved in IFN-γ signaling such as STAT1. In addition, WARS was found in complex with STAT1 in A375 cells treated with IFN-γ. Finally, we showed that knocking down WARS expression during IFN-γ stimulation further increases the expression of GBP2, APOL1, ISG15, HLA-A and IDO1.
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Affiliation(s)
- Ikrame Lazar
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (I.L.); (I.L.); (A.C.)
- MCD, Centre de Biologie Intégrative (CBI), CNRS, UT3, Université de Toulouse, 31400 Toulouse, France
| | - Ido Livneh
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (I.L.); (I.L.); (A.C.)
| | - Aaron Ciechanover
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (I.L.); (I.L.); (A.C.)
| | - Bertrand Fabre
- The Rappaport Technion Integrated Cancer Center (R-TICC) and the Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (I.L.); (I.L.); (A.C.)
- Laboratoire de Recherche en Sciences Végétales (LRSV), CNRS/UT3/INPT, 31320 Auzeville-Tolosane, France
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Yu Y, Wan X, Li D, Qi Y, Li N, Luo G, Yin H, Wang L, Qin W, Li Y, Li L, Duan W. Dieting alleviates hyperuricemia and organ injuries in uricase-deficient rats via down-regulating cell cycle pathway. PeerJ 2023; 11:e15999. [PMID: 37701826 PMCID: PMC10494837 DOI: 10.7717/peerj.15999] [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: 04/19/2023] [Accepted: 08/09/2023] [Indexed: 09/14/2023] Open
Abstract
Dieting is a basic treatment for lowering hyperuricemia. Here, we aimed to determine the optimal amount of dietary food that lowers serum uric acid (SUA) without modifying the dietary ingredients in rats. Increased SUA was found in food-deprived 45-day-old uricase-deficient rats (Kunming-DY rats), and the optimal amount of dietary food (75% dietary intake) to lower SUA was established by controlling the amount of food given daily from 25% to 100% for 2 weeks. In addition to lowering SUA by approximately 22.5 ± 20.5%, the optimal amount of dietary food given for 2 weeks inhibited urine uric acid excretion, lowered the uric acid content in multiple organs, improved renal function, lowered serum triglyceride, alleviated organ injuries (e.g., liver, kidney and intestinal tract) at the histological level, and down-regulated the Kyoto Encyclopedia of Genes and Genome (KEGG) pathway of the cell cycle (ko04110). Taken together, these results demonstrate that 75% dietary food effectively lowers the SUA level without modifying dietary ingredients and alleviates the injuries resulting from uricase deficiency or hyperuricemia, the mechanism of which is associated with the down-regulation of the cell cycle pathway.
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Affiliation(s)
- Yun Yu
- School of Basic Medicine, Kunming Medical University, Kunming, Yunnan, China
| | - Xulian Wan
- School of Chinese Medicine, Yunnan University of Traditional Chinese Medicne, Kunming, Yunnan, China
| | - Dan Li
- School of Basic Medicine, Kunming Medical University, Kunming, Yunnan, China
| | - Yalin Qi
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
| | - Ning Li
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
| | - Guangyun Luo
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
| | - Hua Yin
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
| | - Lei Wang
- School of Basic Medicine, Kunming Medical University, Kunming, Yunnan, China
| | - Wan Qin
- School of Chinese Medicine, Yunnan University of Traditional Chinese Medicne, Kunming, Yunnan, China
| | - Yongkun Li
- School of Chinese Medicine, Yunnan University of Traditional Chinese Medicne, Kunming, Yunnan, China
| | - Lvyu Li
- The Third Affiliated Hospital, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
| | - Weigang Duan
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan, China
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Udasin RG, Gottfried Y, Fabre B, Bercovich B, Ziv T, Ciechanover A. The p105 NF-ĸB precursor is a pseudo substrate of the ubiquitin ligase FBXO7, and its binding to the ligase stabilizes it and results in stimulated cell proliferation. Biochem Biophys Res Commun 2020; 558:224-230. [PMID: 32933748 DOI: 10.1016/j.bbrc.2020.08.098] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 08/25/2020] [Indexed: 01/11/2023]
Abstract
The NF-κB transcription factor is involved in inflammation and cell proliferation, survival, and transformation. It is a heterodimer made of p50 or p52 and a member of the Rel family of proteins. p50 and p52 are derived from limited ubiquitin- and proteasome-mediated proteolytic processing of the larger precursors p105 and p100, respectively. Both precursors can be either processed or completely degraded by the ubiquitin-proteasome system. Previous work in our laboratory identified KPC1 as a ubiquitin ligase that mediates processing of p105 to the p50 subunit. Overexpression of the ligase leads to increased level of p50 with a resultant marked tumor-suppressive effect. In the present study, we identify FBXO7, a known ubiquitin ligase that binds to p105 and ubiquitinates it, but surprisingly, leads to its accumulation and to that of p65 - the Rel partner of p50 - and to increased cell proliferation. Importantly, a ΔF-Box mutant of FBXO7 which is inactive has similar effects on accumulation of p105 and cell proliferation, strongly suggesting that p105 is a pseudo substrate of FBXO7.
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Affiliation(s)
- Ronald G Udasin
- The Technion Rappaport Integrated Cancer Center (T-RICC), The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, 3109601, Israel
| | - Yossi Gottfried
- The Technion Rappaport Integrated Cancer Center (T-RICC), The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, 3109601, Israel
| | - Bertrand Fabre
- The Technion Rappaport Integrated Cancer Center (T-RICC), The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, 3109601, Israel
| | - Beatrice Bercovich
- The Technion Rappaport Integrated Cancer Center (T-RICC), The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, 3109601, Israel
| | - Tamar Ziv
- The Smoler Proteomics Center, Faculty of Biology, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
| | - Aaron Ciechanover
- The Technion Rappaport Integrated Cancer Center (T-RICC), The Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa, 3109601, Israel.
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Identification of proteins regulated by the proteasome following induction of endoplasmic reticulum stress. Biochem Biophys Res Commun 2019; 517:188-192. [PMID: 31327494 DOI: 10.1016/j.bbrc.2019.07.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 07/15/2019] [Indexed: 12/30/2022]
Abstract
The endoplasmic reticulum (ER) is a major site for protein synthesis, folding and transport, lipid and steroid synthesis, regulating redox potential, as well as calcium storage. It therefore relies on delicate homeostasis, and perturbation of the ER function and induction of ER stress can lead to apoptosis. One cause of disruption of the ER homeostasis is the accumulation of misfolded proteins. To prevent this perturbation, the Endoplasmic Reticulum-Associated Degradation (ERAD) quality control machinery is recruited to remove these proteins in a three-step process: (1) extraction from the ER, (2) ubiquitination, and (3) subsequent proteasomal degradation. However, the identity of the proteins regulated by the proteasome following induction of the ER stress has remained obscure. In the present study, we investigated the role of the proteasome in the modulation of the proteome of HeLa cells after treatment with thapsigargin and tunicamycin, two drugs known to induce ER stress through accumulation of misfolded proteins. Using label-free quantitative proteomics we found that out of the proteins identified to decrease in their level following induction of ER stress, more than 64% are targeted by the proteasome. Among these proteins, key players of the Wnt signaling pathway, such as β-catenin and GSK3, as well as α-catenin which is involved in cell-cell adhesion, were identified as being modulated by the proteasome upon ER stress.
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