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Lu C, Li Z, Zhang W, Guo H, Lan W, Shen G, Xia Q, Zhao P. SUMOylation of Translationally Regulated Tumor Protein Modulates Its Immune Function. Front Immunol 2022; 13:807097. [PMID: 35197979 PMCID: PMC8858932 DOI: 10.3389/fimmu.2022.807097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/13/2022] [Indexed: 11/13/2022] Open
Abstract
Translationally controlled tumor protein (TCTP) is a highly conserved protein possessing numerous biological functions and molecular interactions, ranging from cell growth to immune responses. However, the molecular mechanism by which TCTP regulates immune function is largely unknown. Here, we found that knockdown of Bombyx mori translationally controlled tumor protein (BmTCTP) led to the increased susceptibility of silkworm cells to virus infection, whereas overexpression of BmTCTP significantly decreased the virus replication. We further demonstrated that BmTCTP could be modified by SUMOylation molecular BmSMT3 at the lysine 164 via the conjugating enzyme BmUBC9, and the stable SUMOylation of BmTCTP by expressing BmTCTP-BmSMT3 fusion protein exhibited strong antiviral activity, which confirmed that the SUMOylation of BmTCTP would contribute to its immune responses. Further work indicated that BmTCTP is able to physically interact with interleukin enhancer binding factor (ILF), one immune molecular, involved in antivirus, and also induce the expression of BmILF in response to virus infection, which in turn enhanced antiviral activity of BmTCTP. Altogether, our present study has provided a novel insight into defending against virus via BmTCTP SUMOylation signaling pathway and interacting with key immune molecular in silkworm.
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Affiliation(s)
- Chenchen Lu
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Zhiqing Li
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
- *Correspondence: Zhiqing Li,
| | - Wenchang Zhang
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Hao Guo
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Weiqun Lan
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Guanwang Shen
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Qingyou Xia
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, Biological Science Research Center, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
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Malard F, Jacquet E, Nhiri N, Sizun C, Chabrier A, Messaoudi S, Dejeu J, Betzi S, Zhang X, Thureau A, Lescop E. Revisiting the Molecular Interactions between the Tumor Protein TCTP and the Drugs Sertraline/Thioridazine. ChemMedChem 2021; 17:e202100528. [PMID: 34472703 DOI: 10.1002/cmdc.202100528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Indexed: 11/07/2022]
Abstract
TCTP protein is a pharmacological target in cancer and TCTP inhibitors such as sertraline have been evaluated in clinical trials. The direct interaction of TCTP with the drugs sertraline and thioridazine has been reported in vitro by SPR experiments to be in the ∼30-50 μM Kd range (Amson et al. Nature Med 2012), supporting a TCTP-dependent mode of action of the drugs on tumor cells. However, the molecular details of the interaction remain elusive although they are crucial to improve the efforts of on-going medicinal chemistry. In addition, TCTP can be phosphorylated by the Plk-1 kinase, which is indicative of poor prognosis in several cancers. The impact of phosphorylation on TCTP structure/dynamics and binding with therapeutical ligands remains unexplored. Here, we combined NMR, TSA, SPR, BLI and ITC techniques to probe the molecular interactions between TCTP with the drugs sertraline and thioridazine. We reveal that drug binding is much weaker than reported with an apparent ∼mM Kd and leads to protein destabilization that obscured the analysis of the published SPR data. We further demonstrate by NMR and SAXS that TCTP S46 phosphorylation does not promote tighter interaction between TCTP and sertraline. Accordingly, we question the supported model in which sertraline and thioridazine directly interact with isolated TCTP in tumor cells and discuss alternative modes of action for the drugs in light of current literature.
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Affiliation(s)
- Florian Malard
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Saclay, 1 av. de la terrasse, 91198, Gif-sur-Yvette, France
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Saclay, 1 av. de la terrasse, 91198, Gif-sur-Yvette, France
| | - Naima Nhiri
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Saclay, 1 av. de la terrasse, 91198, Gif-sur-Yvette, France
| | - Christina Sizun
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Saclay, 1 av. de la terrasse, 91198, Gif-sur-Yvette, France
| | - Amélie Chabrier
- Université Paris-Saclay, BioCIS, Faculté de Pharmacie, CNRS, 92290, Châtenay-Malabry, France
| | - Samir Messaoudi
- Université Paris-Saclay, BioCIS, Faculté de Pharmacie, CNRS, 92290, Châtenay-Malabry, France
| | - Jérôme Dejeu
- Univ. Grenoble Alpes, CNRS, DCM, 38000, Grenoble, France
| | - Stéphane Betzi
- Centre de Recherche en Cancérologie de Marseille (CRCM), CNRS, Aix-Marseille Université, Inserm, Institut Paoli-Calmettes, 27 bd Lei Roure, 13273, Marseille CEDEX 9, France
| | - Xu Zhang
- Centre de Recherche en Cancérologie de Marseille (CRCM), CNRS, Aix-Marseille Université, Inserm, Institut Paoli-Calmettes, 27 bd Lei Roure, 13273, Marseille CEDEX 9, France
| | | | - Ewen Lescop
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Saclay, 1 av. de la terrasse, 91198, Gif-sur-Yvette, France
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Neuhäuser K, Küper L, Christiansen H, Bogdanova N. Assessment of the role of translationally controlled tumor protein 1 (TPT1/TCTP) in breast cancer susceptibility and ATM signaling. Clin Transl Radiat Oncol 2019; 15:99-107. [PMID: 30815593 PMCID: PMC6378894 DOI: 10.1016/j.ctro.2019.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 01/19/2019] [Accepted: 01/23/2019] [Indexed: 01/08/2023] Open
Abstract
TPT1 sequencing identified one novel, potentially damaging mutation in 200 breast cancer patients. TPT1 is not required for the recognition of radiation-induced DNA damage. Phosphorylation of KAP1 and CHEK2 by ATM is not affected by silencing of TPT1. Nuclear localization and foci formation of TPT1 potentially depends on cell type. TPT1 knockdown might exert a marginally significant effect on residual γH2A.X foci.
Background and purpose The translationally controlled tumor protein 1 (TPT1/TCTP) has been implicated in the intracellular DNA damage response. We tested the role of TPT1 in breast cancer (BC) predisposition and re-evaluated its function in Ataxia-Telangiectasia mutated (ATM)-mediated damage recognition and DNA repair. Material and methods The TPT1 coding sequence was scanned for mutations in genomic DNA from 200 breast cancer patients. TPT1 was down-regulated through siRNA in breast epithelial and fibroblast cell cultures. ATM activation after irradiation (IR) was analyzed by western blotting, and γH2A.X foci were monitored by immunocytochemistry. Results The sequencing study identified a novel, potentially damaging missense mutation in a single patient. Silencing of TPT1 did not significantly affect ATM kinase activity and did not impair the initial formation of γH2A.X foci, while we observed a marginally significant effect on residual γH2A.X foci at 6–48 h after IR. Conclusions TPT1 does not harbor common mutations as BC susceptibility gene. Consistently, TPT1 protein is not required for the recognition of radiation-induced DNA damage via the ATM-dependent pathway and has only slight impact on timely repair. These results may be important when considering TPT1 as a DNA damage marker.
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Affiliation(s)
- Katharina Neuhäuser
- Radiation Oncology Research Unit, Hannover Medical School, Carl-Neuberg Str. 1, 30625 Hannover, Germany
| | - Leonie Küper
- Radiation Oncology Research Unit, Hannover Medical School, Carl-Neuberg Str. 1, 30625 Hannover, Germany.,Gynaecology Research Unit, Hannover Medical School, Carl-Neuberg Str. 1, 30625 Hannover, Germany
| | - Hans Christiansen
- Radiation Oncology Research Unit, Hannover Medical School, Carl-Neuberg Str. 1, 30625 Hannover, Germany
| | - Natalia Bogdanova
- Radiation Oncology Research Unit, Hannover Medical School, Carl-Neuberg Str. 1, 30625 Hannover, Germany
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Some Biological Consequences of the Inhibition of Na,K-ATPase by Translationally Controlled Tumor Protein (TCTP). Int J Mol Sci 2018; 19:ijms19061657. [PMID: 29867020 PMCID: PMC6032315 DOI: 10.3390/ijms19061657] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 05/29/2018] [Accepted: 05/30/2018] [Indexed: 12/17/2022] Open
Abstract
Na,K-ATPase is an ionic pump that regulates the osmotic equilibrium and membrane potential of cells and also functions as a signal transducer. The interaction of Na,K-ATPase with translationally controlled tumor protein (TCTP) results, among others, in the inhibition of the former's pump activity and in the initiation of manifold biological and pathological phenomena. These phenomena include hypertension and cataract development in TCTP-overexpressing transgenic mice, as well as the induction of tumorigenesis signaling pathways and the activation of Src that ultimately leads to cell proliferation and migration. This review attempts to collate the biological effects of Na,K-ATPase and TCTP interaction and suggests that this interaction has the potential to serve as a possible therapeutic target for selected diseases.
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Malard F, Assrir N, Alami M, Messaoudi S, Lescop E, Ha-Duong T. Conformational Ensemble and Biological Role of the TCTP Intrinsically Disordered Region: Influence of Calcium and Phosphorylation. J Mol Biol 2018; 430:1621-1639. [DOI: 10.1016/j.jmb.2018.04.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 04/19/2018] [Accepted: 04/22/2018] [Indexed: 01/09/2023]
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Wong JH, Alfatah M, Sin MF, Sim HM, Verma CS, Lane DP, Arumugam P. A yeast two-hybrid system for the screening and characterization of small-molecule inhibitors of protein-protein interactions identifies a novel putative Mdm2-binding site in p53. BMC Biol 2017; 15:108. [PMID: 29121928 PMCID: PMC5680816 DOI: 10.1186/s12915-017-0446-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 10/19/2017] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Protein-protein interactions (PPIs) are fundamental to the growth and survival of cells and serve as excellent targets to develop inhibitors of biological processes such as host-pathogen interactions and cancer cell proliferation. However, isolation of PPI inhibitors is extremely challenging. While several in vitro assays to screen for PPI inhibitors are available, they are often expensive, cumbersome, and require large amounts of purified protein. In contrast, limited in vivo assays are available to screen for small-molecule inhibitors of PPI. METHODS We have engineered a yeast strain that is suitable for screening of small-molecule inhibitors of protein-protein interaction using the Yeast 2-hybrid Assay. We have optimised and validated the assay using inhibitors of the p53-Mdm2 interaction and identified a hitherto unreported putative Mdm2-binding domain in p53. RESULTS We report a significantly improved and thoroughly validated yeast two-hybrid (Y2H) assay that can be used in a high throughput manner to screen for small-molecule PPI inhibitors. Using the p53-Mdm2 interaction to optimize the assay, we show that the p53-Mdm2 inhibitor nutlin-3 is a substrate for the yeast ATP-binding cassette (ABC) transporter Pdr5. By deleting nine ABC transporter-related genes, we generated a ABC9Δ yeast strain that is highly permeable to small molecules. In the ABC9Δ strain, p53-Mdm2 interaction inhibitors, like AMG232 and MI-773, completely inhibited the p53-Mdm2 interaction at nanomolar concentrations in the Y2H assay. In addition, we identified a conserved segment in the core DNA-binding domain of p53 that facilitates stable interaction with Mdm2 in yeast cells and in vitro. CONCLUSION The Y2H assay can be utilized for high-throughput screening of small-molecule inhibitors of PPIs and to identify domains that stabilize PPIs.
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Affiliation(s)
- Jin Huei Wong
- Bioinformatics Institute, 30 Biopolis Street, #07-01, Matrix, Singapore, 138671, Singapore
| | - Mohammad Alfatah
- Bioinformatics Institute, 30 Biopolis Street, #07-01, Matrix, Singapore, 138671, Singapore
| | - Mei Fang Sin
- Department of Pharmacy, National University of Singapore, National University of Singapore 18 Science Drive 4, Singapore, 117543, Singapore
| | - Hong May Sim
- Department of Pharmacy, National University of Singapore, National University of Singapore 18 Science Drive 4, Singapore, 117543, Singapore
| | - Chandra S Verma
- Bioinformatics Institute, 30 Biopolis Street, #07-01, Matrix, Singapore, 138671, Singapore.,Department of Biological Sciences, National University of Singapore, 14 Science Drive, Singapore, 117543, Singapore.,Nanyang Technological University, School of Biological Sciences, 50 Nanyang Drive, Singapore, 637551, Singapore
| | - David P Lane
- The p53 Laboratory, 8A Biomedical Grove, Singapore, 138648, Singapore
| | - Prakash Arumugam
- Bioinformatics Institute, 30 Biopolis Street, #07-01, Matrix, Singapore, 138671, Singapore.
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Assrir N, Malard F, Lescop E. Structural Insights into TCTP and Its Interactions with Ligands and Proteins. Results Probl Cell Differ 2017; 64:9-46. [PMID: 29149402 DOI: 10.1007/978-3-319-67591-6_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The 19-24 kDa Translationally Controlled Tumor Protein (TCTP) is involved in a wide range of molecular interactions with biological and nonbiological partners of various chemical compositions such as proteins, peptides, nucleic acids, carbohydrates, or small molecules. TCTP is therefore an important and versatile binding platform. Many of these protein-protein interactions have been validated, albeit only few received an in-depth structural characterization. In this chapter, we will focus on the structural analysis of TCTP and we will review the available literature regarding its interaction network from a structural perspective.
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Affiliation(s)
- Nadine Assrir
- Institut de Chimie des Substances Naturelles, CNRS UPR2301, Université Paris-Sud, Université Paris-Saclay, 1 avenue de la Terrasse, 91190, Gif-sur-Yvette, France
| | - Florian Malard
- Institut de Chimie des Substances Naturelles, CNRS UPR2301, Université Paris-Sud, Université Paris-Saclay, 1 avenue de la Terrasse, 91190, Gif-sur-Yvette, France
| | - Ewen Lescop
- Institut de Chimie des Substances Naturelles, CNRS UPR2301, Université Paris-Sud, Université Paris-Saclay, 1 avenue de la Terrasse, 91190, Gif-sur-Yvette, France.
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Bommer UA. The Translational Controlled Tumour Protein TCTP: Biological Functions and Regulation. Results Probl Cell Differ 2017; 64:69-126. [PMID: 29149404 DOI: 10.1007/978-3-319-67591-6_4] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The Translational Controlled Tumour Protein TCTP (gene symbol TPT1, also called P21, P23, Q23, fortilin or histamine-releasing factor, HRF) is a highly conserved protein present in essentially all eukaryotic organisms and involved in many fundamental cell biological and disease processes. It was first discovered about 35 years ago, and it took an extended period of time for its multiple functions to be revealed, and even today we do not yet fully understand all the details. Having witnessed most of this history, in this chapter, I give a brief overview and review the current knowledge on the structure, biological functions, disease involvements and cellular regulation of this protein.TCTP is able to interact with a large number of other proteins and is therefore involved in many core cell biological processes, predominantly in the response to cellular stresses, such as oxidative stress, heat shock, genotoxic stress, imbalance of ion metabolism as well as other conditions. Mechanistically, TCTP acts as an anti-apoptotic protein, and it is involved in DNA-damage repair and in cellular autophagy. Thus, broadly speaking, TCTP can be considered a cytoprotective protein. In addition, TCTP facilitates cell division through stabilising the mitotic spindle and cell growth through modulating growth signalling pathways and through its interaction with the proteosynthetic machinery of the cell. Due to its activities, both as an anti-apoptotic protein and in promoting cell growth and division, TCTP is also essential in the early development of both animals and plants.Apart from its involvement in various biological processes at the cellular level, TCTP can also act as an extracellular protein and as such has been involved in modulating whole-body defence processes, namely in the mammalian immune system. Extracellular TCTP, typically in its dimerised form, is able to induce the release of cytokines and other signalling molecules from various types of immune cells. There are also several examples, where TCTP was shown to be involved in antiviral/antibacterial defence in lower animals. In plants, the protein appears to have a protective effect against phytotoxic stresses, such as flooding, draught, too high or low temperature, salt stress or exposure to heavy metals. The finding for the latter stress condition is corroborated by earlier reports that TCTP levels are considerably up-regulated upon exposure of earthworms to high levels of heavy metals.Given the involvement of TCTP in many biological processes aimed at maintaining cellular or whole-body homeostasis, it is not surprising that dysregulation of TCTP levels may promote a range of disease processes, foremost cancer. Indeed a large body of evidence now supports a role of TCTP in at least the most predominant types of human cancers. Typically, this can be ascribed to both the anti-apoptotic activity of the protein and to its function in promoting cell growth and division. However, TCTP also appears to be involved in the later stages of cancer progression, such as invasion and metastasis. Hence, high TCTP levels in tumour tissues are often associated with a poor patient outcome. Due to its multiple roles in cancer progression, TCTP has been proposed as a potential target for the development of new anti-cancer strategies in recent pilot studies. Apart from its role in cancer, TCTP dysregulation has been reported to contribute to certain processes in the development of diabetes, as well as in diseases associated with the cardiovascular system.Since cellular TCTP levels are highly regulated, e.g. in response to cell stress or to growth signalling, and because deregulation of this protein contributes to many disease processes, a detailed understanding of regulatory processes that impinge on TCTP levels is required. The last section of this chapter summarises our current knowledge on the mechanisms that may be involved in the regulation of TCTP levels. Essentially, expression of the TPT1 gene is regulated at both the transcriptional and the translational level, the latter being particularly advantageous when a rapid adjustment of cellular TCTP levels is required, for example in cell stress responses. Other regulatory mechanisms, such as protein stability regulation, may also contribute to the regulation of overall TCTP levels.
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Affiliation(s)
- Ulrich-Axel Bommer
- School of Medicine, Graduate Medicine, University of Wollongong, Wollongong, NSW, 2522, Australia.
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9
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Abstract
The translationally controlled tumor protein (TCTP) is a highly conserved protein that is regulated due to a high number of extracellular stimuli. TCTP has an important role for cell cycle and normal development. On the other side, tumor reversion and malignant transformation have been associated with TCTP. TCTP has been found among the 12 genes that are differentially expressed during mouse oocyte maturation, and an overexpression of this gene was reported in a wide variety of different cancer types. Its antiapoptotic effect is indicated by the interaction with several proapoptotic proteins of the Bcl-2 family and the p53 tumor suppressor protein. In this article, we draw attention to the role of TCTP in cancer, especially, focusing on cell differentiation and tumor reversion, a biological process by which highly tumorigenic cells lose their malignant phenotype. This protein has been shown to be the most strongly downregulated protein in revertant cells compared to the parental cancer cells. Decreased expression of TCTP results either in the reprogramming of cancer cells into reversion or apoptosis. As conventional chemotherapy is frequently associated with the development of drug resistance and high toxicity, the urge for the development of new or additional scientific approaches falls into place. Differentiation therapy aims at reinducing differentiation backward to the nonmalignant cellular state. Here, different approaches have been reported such as the induction of retinoid pathways and the use of histone deacetylase inhibitors. Also, PPARγ agonists and the activation of the vitamin D receptor have been reported as potential targets in differentiation therapy. As TCTP is known as the histamine-releasing factor, antihistaminic drugs have been shown to target this protein. Antihistaminic compounds, hydroxyzine and promethazine, inhibited cell growth of cancer cells and decreased TCTP expression of breast cancer and leukemia cells. Recently, we found that two antihistaminics, levomepromazine and buclizine, inhibited cancer cell growth by direct binding to TCTP and induction of cell differentiation. These data confirmed that TCTP is an exquisite target for anticancer differentiation therapy and antihistaminics have potential to be lead compounds for the direct interaction with TCTP as new inhibitors of human TCTP and tumor growth.
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Affiliation(s)
- Ean-Jeong Seo
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, Johannes Gutenberg University, Staudinger Weg 5, 55128, Mainz, Germany
| | - Nicolas Fischer
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, Johannes Gutenberg University, Staudinger Weg 5, 55128, Mainz, Germany
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, Johannes Gutenberg University, Staudinger Weg 5, 55128, Mainz, Germany.
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Wu H, Gong W, Yao X, Wang J, Perrett S, Feng Y. Evolutionarily conserved binding of translationally controlled tumor protein to eukaryotic elongation factor 1B. J Biol Chem 2015; 290:8694-710. [PMID: 25635048 DOI: 10.1074/jbc.m114.628594] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Indexed: 11/06/2022] Open
Abstract
Translationally controlled tumor protein (TCTP) is an abundant protein that is highly conserved in eukaryotes. However, its primary function is still not clear. Human TCTP interacts with the metazoan-specific eukaryotic elongation factor 1Bδ (eEF1Bδ) and inhibits its guanine nucleotide exchange factor (GEF) activity, but the structural mechanism remains unknown. The interaction between TCTP and eEF1Bδ was investigated by NMR titration, structure determination, paramagnetic relaxation enhancement, site-directed mutagenesis, isothermal titration calorimetry, and HADDOCK docking. We first demonstrated that the catalytic GEF domain of eEF1Bδ is not responsible for binding to TCTP but rather a previously unnoticed central acidic region (CAR) domain in eEF1Bδ. The mutagenesis data and the structural model of the TCTP-eEF1Bδ CAR domain complex revealed the key binding residues. These residues are highly conserved in eukaryotic TCTPs and in eEF1B GEFs, including the eukaryotically conserved eEF1Bα, implying the interaction may be conserved in all eukaryotes. Interactions were confirmed between TCTP and the eEF1Bα CAR domain for human, fission yeast, and unicellular photosynthetic microalgal proteins, suggesting that involvement in protein translation through the conserved interaction with eEF1B represents a primary function of TCTP.
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Affiliation(s)
- Huiwen Wu
- From the National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, the University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weibin Gong
- From the National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101
| | - Xingzhe Yao
- the University of Chinese Academy of Sciences, Beijing 100049, China the Qingdao Engineering Laboratory of Single Cell Oil and Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, and
| | - Jinfeng Wang
- From the National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101
| | - Sarah Perrett
- From the National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101,
| | - Yingang Feng
- the Qingdao Engineering Laboratory of Single Cell Oil and Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, and
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Goh WL, Lee MY, Joseph TL, Quah ST, Brown CJ, Verma C, Brenner S, Ghadessy FJ, Teo YN. Molecular Rotors As Conditionally Fluorescent Labels for Rapid Detection of Biomolecular Interactions. J Am Chem Soc 2014; 136:6159-62. [DOI: 10.1021/ja413031h] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Walter L. Goh
- p53
Laboratory, A*STAR , 8A Biomedical Grove, #06-06 Immunos, Singapore 138648
| | - Min Yen Lee
- Molecular
Engineering Laboratory, Biomedical Sciences Institutes, A*STAR, 61 Biopolis Drive, #03-12 Proteos, Singapore 138673
| | - Thomas L. Joseph
- Bioinformatics
Institute, A*STAR, 30 Biopolis Street, #07-01 Matrix, Singapore 138671
| | - Soo Tng Quah
- p53
Laboratory, A*STAR , 8A Biomedical Grove, #06-06 Immunos, Singapore 138648
| | | | - Chandra Verma
- Bioinformatics
Institute, A*STAR, 30 Biopolis Street, #07-01 Matrix, Singapore 138671
- Department
of Biological Sciences, National University of Singapore, 14 Science
Drive 4, Singapore 117543
- School
of Biological Sciences, Nanyang Technological University, 50 Nanyang
Drive, Singapore 637551
| | - Sydney Brenner
- Molecular
Engineering Laboratory, Biomedical Sciences Institutes, A*STAR, 61 Biopolis Drive, #03-12 Proteos, Singapore 138673
| | - Farid J. Ghadessy
- p53
Laboratory, A*STAR , 8A Biomedical Grove, #06-06 Immunos, Singapore 138648
| | - Yin Nah Teo
- Molecular
Engineering Laboratory, Biomedical Sciences Institutes, A*STAR, 61 Biopolis Drive, #03-12 Proteos, Singapore 138673
- Division
of Chemistry and Biological Chemistry, SPMS, Nanyang Technological University, Singapore 637371
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Abstract
PURPOSE OF REVIEW Tumor reversion is the biological process by which highly tumorigenic cells lose at great extent or entirely their malignant phenotype. The purpose of our research is to understand the molecular program of tumor reversion and its clinical application. We first established biological models of reversion, which was done by deriving revertant cells from different tumors. Secondly, the molecular program that could override the malignant phenotype was assessed. Differential gene-expression profiling showed that at least 300 genes are implicated in this reversion process such as SIAH-1, PS1, TSAP6, and, most importantly, translationally controlled tumor protein (TPT1/TCTP). Decreasing TPT1/TCTP is key in reprogramming malignant cells, including cancer stem cells. RECENT FINDINGS Recent findings indicate that TPT1/TCTP regulates the P53-MDM2-Numb axis. Notably, TPT1/TCTP and p53 are implicated in a reciprocal negative-feedback loop. TPT1/TCTP is a highly significant prognostic factor in breast cancer. Sertraline and thioridazine interfere with this repressive feedback by targeting directly TPT1/TCTP and inhibiting its binding to MDM2, restoring wildtype p53 function. Combining sertraline with classical drugs such as Ara-C in acute myeloid leukemia may be also beneficial. SUMMARY In this review, we discuss some of these reversion pathways and how this approach could open a new route to cancer treatment.
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Wei SJ, Joseph T, Sim AYL, Yurlova L, Zolghadr K, Lane D, Verma C, Ghadessy F. In vitro selection of mutant HDM2 resistant to Nutlin inhibition. PLoS One 2013; 8:e62564. [PMID: 23653682 PMCID: PMC3641235 DOI: 10.1371/journal.pone.0062564] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 03/22/2013] [Indexed: 11/25/2022] Open
Abstract
HDM2 binds to the p53 tumour suppressor and targets it for proteosomal degradation. Presently in clinical trials, the small molecule Nutlin-3A competitively binds to HDM2 and abrogates its repressive function. Using a novel in vitro selection methodology, we simulated the emergence of resistance by evolving HDM2 mutants capable of binding p53 in the presence of Nutlin concentrations that inhibit the wild-type HDM2-p53 interaction. The in vitro phenotypes were recapitulated in ex vivo assays measuring both p53 transactivation function and the direct p53-HDM2 interaction in the presence of Nutlin. Mutations conferring drug resistance were not confined to the N-terminal p53/Nutlin–binding domain, and were additionally seen in the acidic, zinc finger and RING domains. Mechanistic insights gleaned from this broad spectrum of mutations will aid in future drug design and further our understanding of the complex p53-HDM2 interaction.
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Affiliation(s)
- Siau Jia Wei
- p53Lab, Agency for Science, Technology and Research, Singapore, Singapore
- Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, Singpore
| | - Thomas Joseph
- Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, Singpore
| | - Adelene Y. L. Sim
- Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, Singpore
| | | | | | - David Lane
- p53Lab, Agency for Science, Technology and Research, Singapore, Singapore
| | - Chandra Verma
- Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, Singpore
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
- * E-mail: (CV); sg (FG)
| | - Farid Ghadessy
- p53Lab, Agency for Science, Technology and Research, Singapore, Singapore
- * E-mail: (CV); sg (FG)
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Chen K, Chen S, Huang C, Cheng H, Zhou R. TCTP increases stability of hypoxia-inducible factor 1α by interaction with and degradation of the tumour suppressor VHL. Biol Cell 2013; 105:208-218. [PMID: 23387829 DOI: 10.1111/boc.201200080] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 01/30/2013] [Indexed: 12/16/2022]
Abstract
BACKGROUND INFORMATION The translationally controlled tumour protein (TCTP) plays an important role in maintaining cell proliferation and its high expression is associated with many tumours. The tumour suppressor von Hippel-Lindau protein (VHL) has been shown to function as an E3 ubiquitin ligase. Although great progress has been made, biological roles of these factors and relevant molecular mechanisms remain largely unknown. RESULTS In this study, we have shown that TCTP specifically binds to VHL through its β domain and competes with hypoxia-inducible factor-1α (HIF1α). TCTP over-expression decreased the protein level of VHL and the inhibition of TCTP expression by miRNA resulted in an increase of the VHL protein level. Moreover, TCTP over-expression promoted the K48-linked ubiquitination of VHL, thus degradation through the ubiquitin-proteasome pathway. In addition, we showed that TCTP increased the protein level of HIF1α, which promoted both vascular endothelial growth factor-hypoxic response element-promoter-driven luciferase reporter and endogenous VEGF expression. CONCLUSIONS These data have demonstrated that TCTP binds to the β domain of VHL through competition with HIF1α, which promotes VHL degradation by the ubiquitin-proteasome system and HIF1α stability.
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Affiliation(s)
- Ke Chen
- Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Shuliang Chen
- Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Chunhua Huang
- Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Hanhua Cheng
- Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Rongjia Zhou
- Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China
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