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Gunasinghe KJ, Rahman T, Chee Wezen X. Unraveling the Behavior of Intrinsically Disordered Protein c-Myc: A Study Utilizing Gaussian-Accelerated Molecular Dynamics. ACS OMEGA 2024; 9:2250-2262. [PMID: 38250404 PMCID: PMC10795134 DOI: 10.1021/acsomega.3c05822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 11/02/2023] [Accepted: 11/21/2023] [Indexed: 01/23/2024]
Abstract
The protein c-Myc is a transcription factor that remains largely intrinsically disordered and is known to be involved in various biological processes and is overexpressed in various cancers, making it an attractive drug target. However, intrinsically disordered proteins such as c-Myc do not show funnel-like basins in their free-energy landscapes; this makes their druggability a challenge. For the first time, we propose a heterodimer model of c-Myc/Max in full length in this work. We used Gaussian-accelerated molecular dynamics (GaMD) simulations to explore the behavior of c-Myc and its various regions, including the transactivation domain (TAD) and the basic helix-loop-helix-leucine-zipper (bHLH-Zipper) motif in three different conformational states: (a) monomeric c-Myc, (b) c-Myc when bound to its partner protein, Max, and (c) when Max was removed after binding. We analyzed the GaMD trajectories using root-mean-square deviation (RMSD), radius of gyration, root-mean-square fluctuation, and free-energy landscape (FEL) calculations to elaborate the behaviors of these regions. The results showed that the monomeric c-Myc structure showed a higher RMSD fluctuation as compared with the c-Myc/Max heterodimer in the bHLH-Zipper motif. This indicated that the bHLH-Zipper motif of c-Myc is more stable when it is bound to Max. The TAD region in both monomeric and Max-bound states showed similar plasticity in terms of RMSD. We also conducted residue decomposition calculations and showed that the c-Myc and Max interaction could be driven mainly by electrostatic interactions and the residues Arg299, Ile403, and Leu420 seemed to play important roles in the interaction. Our work provides insights into the behavior of c-Myc and its regions that could support the development of drugs that target c-Myc and other intrinsically disordered proteins.
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Affiliation(s)
| | - Taufiq Rahman
- Department
of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, United Kingdom
| | - Xavier Chee Wezen
- Faculty
of Engineering, Computing and Science, Swinburne
University of Technology Sarawak, Kuching 93350, Malaysia
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2
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El Kharraz S, Dubois V, Launonen KM, Helminen L, Palvimo JJ, Libert C, Smeets E, Moris L, Eerlings R, Vanderschueren D, Helsen C, Claessens F. N/C Interactions Are Dispensable for Normal In Vivo Functioning of the Androgen Receptor in Male Mice. Endocrinology 2022; 163:6652495. [PMID: 35908178 PMCID: PMC9756762 DOI: 10.1210/endocr/bqac104] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Indexed: 11/19/2022]
Abstract
The androgen receptor (AR) plays a central role in the development and maintenance of the male phenotype. The binding of androgens to the receptor induces interactions between the carboxyterminal ligand-binding domain and the highly conserved 23FQNLF27 motif in the aminoterminal domain. The role of these so-called N/C interactions in AR functioning is debated. In vitro assays show that mutating the AR in the 23FQNLF27 motif (called ARNoC) attenuates the AR transactivation of reporter genes, has no effect on ligand binding, but does affect protein-protein interactions with several AR coregulators. To test the in vivo relevance of the N/C interaction, we analyzed the consequences of the genomic introduction of the ARNoC mutation in mice. Surprisingly, the ARNoC/Y mice show a normal male development, with unaffected male anogenital distance and normal accessory sex glands, male circulating androgen levels, body composition, and fertility. The responsiveness of androgen target genes in kidney, prostate, and testes was also unaffected. We thus conclude that the N/C interactions in the AR are not essential for the development of a male phenotype under normal physiological conditions.
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Affiliation(s)
- Sarah El Kharraz
- Correspondence: Frank Claessens, PhD, Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium. . Reprint requests can be sent to or
| | - Vanessa Dubois
- Department of Chronic Diseases and Metabolism, Clinical and Experimental Endocrinology, KU Leuven, Leuven, 3000, Belgium
- Department of Basic and Applied Medical Sciences, Basic and Translational Endocrinology, Ghent University, Ghent, 9000, Belgium
| | - Kaisa-Mari Launonen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, 70210, Finland
| | - Laura Helminen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, 70210, Finland
| | - Jorma J Palvimo
- Institute of Biomedicine, University of Eastern Finland, Kuopio, 70210, Finland
| | - Claude Libert
- VIB Center for Inflammation Research, VIB, Ghent, 9052, Belgium
- Department for Biomedical Molecular Biology, Ghent University, Ghent, 9052, Belgium
| | - Elien Smeets
- Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium
| | - Lisa Moris
- Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium
| | - Roy Eerlings
- Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium
| | - Dirk Vanderschueren
- Department of Chronic Diseases and Metabolism, Clinical and Experimental Endocrinology, KU Leuven, Leuven, 3000, Belgium
| | - Christine Helsen
- Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium
| | - Frank Claessens
- Correspondence: Frank Claessens, PhD, Department of Cellular and Molecular Medicine, Molecular Endocrinology Laboratory, KU Leuven, Leuven, 3000, Belgium. . Reprint requests can be sent to or
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Iwabuchi E, Miki Y, Suzuki T, Sasano H. Visualization of the protein-protein interactions of hormone receptors in hormone-dependent cancer research. ENDOCRINE ONCOLOGY (BRISTOL, ENGLAND) 2022; 2:R132-R142. [PMID: 37435453 PMCID: PMC10259353 DOI: 10.1530/eo-22-0059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 10/03/2022] [Indexed: 07/13/2023]
Abstract
In hormone-dependent cancers, the activation of hormone receptors promotes the progression of cancer cells. Many proteins exert their functions through protein-protein interactions (PPIs). Moreover, in such cancers, hormone-hormone receptor binding, receptor dimerization, and cofactor mobilization PPIs occur primarily in hormone receptors, including estrogen, progesterone, glucocorticoid, androgen, and mineralocorticoid receptors. The visualization of hormone signaling has been primarily reported by immunohistochemistry using specific antibodies; however, the visualization of PPIs is expected to improve our understanding of hormone signaling and disease pathogenesis. Visualization techniques for PPIs include Förster resonance energy transfer (FRET) and bimolecular fluorescence complementation analysis; however, these techniques require the insertion of probes in the cells for PPI detection. Proximity ligation assay (PLA) is a method that could be used for both formalin-fixed paraffin-embedded (FFPE) tissue as well as immunostaining. It can also visualize hormone receptor localization and post-translational modifications of hormone receptors. This review summarizes the results of recent studies on visualization techniques for PPIs with hormone receptors; these techniques include FRET and PLA. In addition, super-resolution microscopy has been recently reported to be applicable to their visualization in both FFPE tissues and living cells. Super-resolution microscopy in conjunction with PLA and FRET could also contribute to the visualization of PPIs and subsequently provide a better understanding of the pathogenesis of hormone-dependent cancers in the future.
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Affiliation(s)
- Erina Iwabuchi
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Pathology and Histotechnology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yasuhiro Miki
- Department of Disaster Obstetrics and Gynecology, International Research Institute of Disaster Science (IRIDes), Tohoku University, Sendai, Japan
| | - Takashi Suzuki
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Pathology and Histotechnology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
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4
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Metabolomic profiling to evaluate the efficacy of proxalutamide, a novel androgen receptor antagonist, in prostate cancer cells. Invest New Drugs 2020; 38:1292-1302. [DOI: 10.1007/s10637-020-00901-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 01/17/2020] [Indexed: 01/19/2023]
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Höflmayer D, Willich C, Hube-Magg C, Simon R, Lang D, Neubauer E, Jacobsen F, Hinsch A, Luebke AM, Tsourlakis MC, Huland H, Graefen M, Haese A, Heinzer H, Minner S, Büscheck F, Sauter G, Schlomm T, Steurer S, Clauditz TS, Burandt E, Wilczak W, Bernreuther C. SNW1 is a prognostic biomarker in prostate cancer. Diagn Pathol 2019; 14:33. [PMID: 31043167 PMCID: PMC6495565 DOI: 10.1186/s13000-019-0810-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 04/11/2019] [Indexed: 12/16/2022] Open
Abstract
Background SNW1 is a nuclear receptor co-activator involved in splicing and transcription control, including androgen receptor signaling. Overexpression of SNW1 has been linked to adverse prognosis in different cancer types, but studies on the role of SNW1 in prostate cancer are lacking. Methods Using immunohistochemistry, we analyzed SNW1 expression in 10,310 prostate cancers in a tissue microarray (TMA) with attached clinical and molecular data. Results The comparison with normal prostate tissue revealed an up regulation of SNW1 in a subset of cancer samples. SNW1 staining was considered weak in 31.5%, moderate in 37.7% and strong in 14% of cancers. Strong SNW1 expression was markedly more frequent in prostate cancers harboring the TMPRSS2:ERG fusion (24%) than in ERG negative cancers (7%, p < 0.0001). Significant associations with Gleason grade, stage, nodal status and early biochemical recurrence were observed in the ERG negative and positive subset. Multivariable modeling revealed that the prognostic value of SNW1 up regulation was independent from the established preoperative histopathological and clinical parameters. Conclusion These results demonstrate that SNW1 overexpression is an independent prognostic marker in prostate cancer with potential clinical utility. Electronic supplementary material The online version of this article (10.1186/s13000-019-0810-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Doris Höflmayer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Carla Willich
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Claudia Hube-Magg
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Ronald Simon
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany.
| | - Dagmar Lang
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Emily Neubauer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Frank Jacobsen
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Andrea Hinsch
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Andreas M Luebke
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Marie Christina Tsourlakis
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Hartwig Huland
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Markus Graefen
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Alexander Haese
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Hans Heinzer
- Martini-Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Sarah Minner
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Franziska Büscheck
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Guido Sauter
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Thorsten Schlomm
- Department of Urology, Charité - Universitätsmedizin Berlin, Charitéplatz 1, D-10117, Berlin, Germany
| | - Stefan Steurer
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Till S Clauditz
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Eike Burandt
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Waldemar Wilczak
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
| | - Christian Bernreuther
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246, Hamburg, Germany
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Carbonell C, Ulsamer A, Vivori C, Papasaikas P, Böttcher R, Joaquin M, Miñana B, Tejedor JR, de Nadal E, Valcárcel J, Posas F. Functional Network Analysis Reveals the Relevance of SKIIP in the Regulation of Alternative Splicing by p38 SAPK. Cell Rep 2019; 27:847-859.e6. [PMID: 30995481 PMCID: PMC6484779 DOI: 10.1016/j.celrep.2019.03.060] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 02/21/2019] [Accepted: 03/15/2019] [Indexed: 01/03/2023] Open
Abstract
Alternative splicing is a prevalent mechanism of gene regulation that is modulated in response to a wide range of extracellular stimuli. Stress-activated protein kinases (SAPKs) play a key role in controlling several steps of mRNA biogenesis. Here, we show that osmostress has an impact on the regulation of alternative splicing (AS), which is partly mediated through the action of p38 SAPK. Splicing network analysis revealed a functional connection between p38 and the spliceosome component SKIIP, whose depletion abolished a significant fraction of p38-mediated AS changes. Importantly, p38 interacted with and directly phosphorylated SKIIP, thereby altering its activity. SKIIP phosphorylation regulated AS of GADD45α, the upstream activator of the p38 pathway, uncovering a negative feedback loop involving AS regulation. Our data reveal mechanisms and targets of SAPK function in stress adaptation through the regulation of AS.
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Affiliation(s)
- Caterina Carbonell
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain
| | - Arnau Ulsamer
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain
| | - Claudia Vivori
- Gene Regulation, Stem Cells and Cancer Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Panagiotis Papasaikas
- Gene Regulation, Stem Cells and Cancer Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - René Böttcher
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Manel Joaquin
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain
| | - Belén Miñana
- Gene Regulation, Stem Cells and Cancer Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Juan Ramón Tejedor
- Gene Regulation, Stem Cells and Cancer Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Eulàlia de Nadal
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain.
| | - Juan Valcárcel
- Gene Regulation, Stem Cells and Cancer Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, Dr. Aiguader 88, 08003 Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010 Barcelona, Spain.
| | - Francesc Posas
- Cell Signaling Research Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Spain.
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7
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SNW1, a Novel Transcriptional Regulator of the NF-κB Pathway. Mol Cell Biol 2019; 39:MCB.00415-18. [PMID: 30397075 DOI: 10.1128/mcb.00415-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Accepted: 10/22/2018] [Indexed: 01/09/2023] Open
Abstract
The nuclear factor kappa B (NF-κB) family of transcription factors plays a central role in coordinating the expression of genes that control inflammation, immune responses, cell proliferation, and a variety of other biological processes. In an attempt to identify novel regulators of this pathway, we performed whole-genome RNA interference (RNAi) screens in physiologically relevant human macrophages in response to lipopolysaccharide and tumor necrosis factor alpha (TNF-α). The top hit was SNW1, a splicing factor and transcriptional coactivator. SNW1 does not regulate the cytoplasmic components of the NF-κB pathway but complexes with the NF-κB heterodimer in the nucleus for transcriptional activation. We show that SNW1 detaches from its splicing complex (formed with SNRNP200 and SNRNP220) upon NF-κB activation and binds to NF-κB's transcriptional elongation partner p-TEFb. We also show that SNW1 is indispensable for the transcriptional elongation of NF-κB target genes such as the interleukin 8 (IL-8) and TNF genes. SNW1 is a unique protein previously shown to be involved in both splicing and transcription, and in this case, its role involves binding to the NF-κB-p-TEFb complex to facilitate transcriptional elongation of some NF-κB target genes.
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Poortahmasebi V, Alavian SM, Nasiri-Toosi M, Norouzi M, Hosseini M, Jazayeri SM. Transcriptome analysis of peripheral blood mononuclear cells from chronic hepatitis B and hepatocellular carcinoma patients: a network-based attitude. Future Virol 2017. [DOI: 10.2217/fvl-2017-0087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aim: The aim of the study was constructing a protein–protein interaction network for chronic hepatitis B (CHB) and hepatocellular carcinoma (HCC) patients. Materials & methods: Comprehensive gene expression profile of peripheral blood mononuclear cells of CHB and HCC were obtained from Gene Expression Omnibus/NCBI database. Differentially expressed genes (DEGs) of samples were analyzed using GEO2R web application. Results: The majority of DEGs in both CHB and HCC has been enriched in immune system responses. However, there was a significant disparity between the enrichment of these genes (especially genes associated with Toll-like receptor-and-TNF) in CHB-HCC compared with normal-CHB. Conclusion: The transcriptome properties of peripheral blood mononuclear cells are changed in patients with HBV-HCC. The immune response genes are the most deregulated genes in HCC patients. [Formula: see text]
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Affiliation(s)
- Vahdat Poortahmasebi
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- Research Center for Clinical Virology, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Moayed Alavian
- Baqiyatallah Research Center for Gastroenterology & Liver Diseases, Baqiyatallah University of Medical Sciences, Tehran, Iran
- Middle East Liver Diseases (MELD) Center, Tehran, Iran
| | - Mohsen Nasiri-Toosi
- Liver Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mehdi Norouzi
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- Research Center for Clinical Virology, Tehran University of Medical Sciences, Tehran, Iran
| | - Mostafa Hosseini
- Liver Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Mohammad Jazayeri
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- Research Center for Clinical Virology, Tehran University of Medical Sciences, Tehran, Iran
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Bogner J, Zolghadr K, Hickson I, Romer T, Yurlova L. The fluorescent two-hybrid assay for live-cell profiling of androgen receptor modulators. J Steroid Biochem Mol Biol 2017; 166:45-53. [PMID: 27174722 DOI: 10.1016/j.jsbmb.2016.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/08/2016] [Accepted: 05/07/2016] [Indexed: 01/03/2023]
Abstract
The androgen receptor (AR) is an important target for drug therapies combating prostate cancer. However, various acquired mutations within the AR sequence often render this receptor resistant to treatment. Ligand-induced interaction between the N- and C-termini of the AR marks the initial step in the AR signaling cascade and can thus serve as an early read-out for analysis of potential antagonists of wt and mutant AR. To measure changes of the N/C interaction in the wt and mutant AR variants upon the addition of inhibitors, we applied our recently developed Fluorescent Two-Hybrid (F2H) assay. The F2H method enables real-time monitoring and quantitative analysis of the interactions between GFP- and RFP-tagged proteins in live mammalian cells, where GFP-tagged proteins are tethered to a specific nuclear location. This anchoring approach provides a local signal enrichment suitable for direct visualization of protein-protein interactions as co-localizations by conventional epifluorescence microscopy. Since the F2H assay is fully reversible, we could monitor dynamics of AR N/C interactions in living cells in real time upon agonistic, as well as antagonistic treatments. In dose-response F2H experiments, we compared the potencies of abiraterone, bicalutamide, enzalutamide, flutamide, and galeterone/TOK-001 to prevent the dihydrotestosterone-induced N/C interaction in wt AR. We further applied the newly developed F2H assay to analyze how the AR N/C interaction is affected by the clinically relevant mutations W741L, F876L, T877A and F876L/T877A. We conclude that F2H is a reliable and technically undemanding approach for straightforward screening of new AR modulators, as well as for monitoring their activity in real time in living cells.
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Affiliation(s)
| | | | - Ian Hickson
- Janssen R&D, LLC, A Division of Johnson & Johnson, Spring House, PA, United States
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10
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Destouches D, Sader M, Terry S, Marchand C, Maillé P, Soyeux P, Carpentier G, Semprez F, Céraline J, Allory Y, Courty J, De La Taille A, Vacherot F. Implication of NPM1 phosphorylation and preclinical evaluation of the nucleoprotein antagonist N6L in prostate cancer. Oncotarget 2016; 7:69397-69411. [PMID: 26993766 PMCID: PMC5342486 DOI: 10.18632/oncotarget.8043] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 02/29/2016] [Indexed: 01/03/2023] Open
Abstract
Despite the advent of several new treatment options over the past years, advanced/metastatic prostate carcinoma (PCa) still remains incurable, which justifies the search for novel targets and therapeutic molecules. Nucleophosmin (NPM1) is a shuttling nucleoprotein involved in tumor growth and its targeting could be a potential approach for cancer therapy. We previously demonstrated that the multivalent pseudopeptide N6L binds to NPM1 potently affecting in vitro and in vivo tumor cell growth of various tumor types as well as angiogenesis. Furthermore, NPM1 binds to androgen receptor (AR) and modulate its activity. In this study, we first investigated the implication of the NPM1 and its Thr199 and Thr234/237 phosphorylated forms in PCa. We showed that phosphorylated forms of NPM1 interact with androgen receptor (AR) in nucleoplasm. N6L treatment of prostate tumor cells led to inhibition of NPM1 phosphorylation in conjunction with inhibition of AR activity. We also found that total and phosphorylated NPM1 were overexpressed in castration-resistant PCa. Assessment of the potential therapeutic role of N6L in PCa indicated that N6L inhibited tumor growth both in vitro and in vivo when used either alone or in combination with the standard-of-care first- (hormonotherapy) and second-line (docetaxel) treatments for advanced PCa. Our findings reveal the role of Thr199 and Thr234/237 phosphorylated NPM1 in PCa progression and define N6L as a new drug candidate for PCa therapy.
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Affiliation(s)
- Damien Destouches
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
- CNRS, ERL 9215, Laboratoire de Recherche sur la Croissance Cellulaire, la Réparation et la Régénération Tissulaires (CRRET), Créteil, F-94000, France
| | - Maha Sader
- Université Paris-Est, UPEC, Créteil, F-94000, France
- CNRS, ERL 9215, Laboratoire de Recherche sur la Croissance Cellulaire, la Réparation et la Régénération Tissulaires (CRRET), Créteil, F-94000, France
| | - Stéphane Terry
- INSERM, U1186, Gustave Roussy Cancer Campus, Villejuif, F-94805, France
| | - Charles Marchand
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
| | - Pascale Maillé
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
- AP-HP, Hôpital H. Mondor – A. Chenevier, Département de Pathologie, Créteil, F-94000, France
| | - Pascale Soyeux
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
| | - Gilles Carpentier
- Université Paris-Est, UPEC, Créteil, F-94000, France
- CNRS, ERL 9215, Laboratoire de Recherche sur la Croissance Cellulaire, la Réparation et la Régénération Tissulaires (CRRET), Créteil, F-94000, France
| | - Fannie Semprez
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
| | - Jocelyn Céraline
- INSERM, U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, F-67000, France
| | - Yves Allory
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
- AP-HP, Hôpital H. Mondor – A. Chenevier, Département de Pathologie, Créteil, F-94000, France
| | - José Courty
- Université Paris-Est, UPEC, Créteil, F-94000, France
- CNRS, ERL 9215, Laboratoire de Recherche sur la Croissance Cellulaire, la Réparation et la Régénération Tissulaires (CRRET), Créteil, F-94000, France
| | - Alexandre De La Taille
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
- AP-HP, Hôpital H. Mondor – A. Chenevier, Département d'Urologie, Créteil, F-94000, France
| | - Francis Vacherot
- Université Paris-Est, UPEC, Créteil, F-94000, France
- INSERM, U955, Equipe 7, Créteil, F-94000, France
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11
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Tilakaratne A, Soory M. Antioxidant response of osteoblasts to doxycycline in an inflammatory model induced by C-reactive protein and interleukin-6. Infect Disord Drug Targets 2015; 14:14-22. [PMID: 25159306 PMCID: PMC4443794 DOI: 10.2174/1871526514666140827101231] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/11/2014] [Accepted: 07/15/2014] [Indexed: 12/15/2022]
Abstract
Objectives: Investigation of osteoblastic responses to oxidative stress, induced by C-reactive protein (CRP) and IL-6 and ameliorating effects of doxycycline (Dox); using assays for 5-alpha dihydrotestosterone (DHT) as an antioxidant marker of healing. IL-6 and CRP are risk markers of periodontitis and prevalent comorbidities in periodontitis subjects. Methods: Confluent monolayer cultures of osteoblasts were incubated with radiolabelled testosterone (14C-T) as substrate, in the presence or absence (Control) of pre-determined optimal concentrations of CRP, IL-6, Dox; alone and in combination (n=8) for 24h in MEM. The eluent was solvent-extracted for steroid metabolites. They were separated using TLC in a benzene/ acetone solvent system 4:1 v/v; and quantified using radioisotope scanning. The identity of formed metabolites was confirmed using the mobility of cold standards added to the samples and disclosed in iodine. Further confirmation of the authenticity of DHT was carried out by combined gas chromatrography-mass spectrometry, after derivatization to pentafluorobenzyloxime trimethyl silyl ether. Results: The yields of DHT from 14C-testosterone showed 2-fold and 1.8-fold- inhibition in response to IL-6 and CRP respectively and 28% stimulation in response to Dox, via the 5-alpha reductase pathway. The combination of IL-6 + CRP showed a 2-fold reduction in the yields of DHT, elevated to control values when combined with Dox (n=8; p<0.001). Yields of 4-androstenedione showed an inverse relationship to those of DHT, in response to the agents tested, in keeping with the 17-beta hydroxysteroid dehydrogenase pathway. Conclusions: Inhibition of DHT synthesis in osteoblasts by IL-6 and CRP was overcome by doxycycline. Oxidative actions of IL-6 and CRP; and antioxidant actions of Dox are reinforced by the metabolic yields of DHT in response to agents tested. Using a novel metabolically active model allows closer extrapolation to in vivo conditions; in the context of adjunctive therapeutic applications for periodontitis and prevalent comorbidities.
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Affiliation(s)
| | - Mena Soory
- King's College London Dental Institute, Denmark Hill, London SE5 9RW, UK.
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12
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Sato N, Maeda M, Sugiyama M, Ito S, Hyodo T, Masuda A, Tsunoda N, Kokuryo T, Hamaguchi M, Nagino M, Senga T. Inhibition of SNW1 association with spliceosomal proteins promotes apoptosis in breast cancer cells. Cancer Med 2014; 4:268-77. [PMID: 25450007 PMCID: PMC4329010 DOI: 10.1002/cam4.366] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 09/24/2014] [Accepted: 09/25/2014] [Indexed: 12/13/2022] Open
Abstract
RNA splicing is a fundamental process for protein synthesis. Recent studies have reported that drugs that inhibit splicing have cytotoxic effects on various tumor cell lines. In this report, we demonstrate that depletion of SNW1, a component of the spliceosome, induces apoptosis in breast cancer cells. Proteomics and biochemical analyses revealed that SNW1 directly associates with other spliceosome components, including EFTUD2 (Snu114) and SNRNP200 (Brr2). The SKIP region of SNW1 interacted with the N-terminus of EFTUD2 as well as two independent regions in the C-terminus of SNRNP200. Similar to SNW1 depletion, knockdown of EFTUD2 increased the numbers of apoptotic cells. Furthermore, we demonstrate that exogenous expression of either the SKIP region of SNW1 or the N-terminus region of EFTUD2 significantly promoted cellular apoptosis. Our results suggest that the inhibition of SNW1 or its associating proteins may be a novel therapeutic strategy for cancer treatment.
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Affiliation(s)
- Naoki Sato
- Department of Surgical Oncology, Nagoya University Graduate School of Medicine, 65 Tsurumai, Showa, Nagoya, 466-8550, Japan
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13
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Kostrouch D, Kostrouchová M, Yilma P, Chughtai AA, Novotný JP, Novák P, Kostrouchová V, Kostrouchová M, Kostrouch Z. SKIP and BIR-1/Survivin have potential to integrate proteome status with gene expression. J Proteomics 2014; 110:93-106. [PMID: 25088050 DOI: 10.1016/j.jprot.2014.07.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 07/05/2014] [Accepted: 07/22/2014] [Indexed: 11/25/2022]
Abstract
UNLABELLED SKIP and BIR are evolutionarily conserved proteins; SKIP (SKP-1) is a known transcription and splicing cofactor while BIR-1/Survivin regulates cell division, gene expression and development. Their loss of function induces overlapping developmental phenotypes. We searched for SKP-1 and BIR-1 interaction on protein level using yeast two-hybrid screens and identified partially overlapping categories of proteins as SKIP-1 and BIR-1 interactors. The interacting proteins included ribosomal proteins, transcription factors, translation factors and cytoskeletal and motor proteins suggesting involvement in multiple protein complexes. To visualize the effect of BIR-1 on the proteome in Caenorhabditis elegans we induced a short time pulse BIR-1 overexpression in synchronized L1 larvae. This led to a dramatic alteration of the whole proteome pattern indicating that BIR-1 alone has the capacity to alter the chromatographic profile of many target proteins including proteins found to be interactors in yeast two hybrid screens. The results were validated for ribosomal proteins RPS3 and RPL5, non-muscle myosin and TAC-1, a transcription cofactor and a centrosome associated protein. Together, these results suggest that SKP-1 and BIR-1 are multifunctional proteins that form multiple protein complexes in both shared and distinct pathways and have the potential to connect proteome signals with the regulation of gene expression. BIOLOGICAL SIGNIFICANCE The genomic organization of the genes encoding BIR-1 and SKIP (SKP-1) in C. elegans have suggested that these two factors, each evolutionarily conserved, have related functions. However, these functional connections have remained elusive and underappreciated in light of limited information from C. elegans and other biological systems. Our results provide further evidence for a functional link between these two factors and suggest they may transmit proteome signals towards the regulation of gene expression.
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Affiliation(s)
- David Kostrouch
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Markéta Kostrouchová
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Petr Yilma
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Ahmed Ali Chughtai
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Jan Philipp Novotný
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Petr Novák
- Laboratory of Structure Biology and Cell Signaling, Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, Prague, Czech Republic
| | - Veronika Kostrouchová
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Marta Kostrouchová
- Laboratory of Molecular Biology and Genetics, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic
| | - Zdeněk Kostrouch
- Laboratory of Molecular Pathology, Institute of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Czech Republic.
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14
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Wang L, Zhang M, Wu Y, Cheng C, Huang Y, Shi Z, Huang H. SKIP expression is correlated with clinical prognosis in patients with bladder cancer. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2014; 7:1695-1701. [PMID: 24817966 PMCID: PMC4014250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 02/26/2014] [Indexed: 06/03/2023]
Abstract
The Ski-interacting protein (SKIP) is a transcriptional cofactor distinct from other cofactors and is involved in regulation of many cancer-related proteins. However, its distribution and clinical significances in bladder cancer remains poorly understood. In this study, Quantitative real-time PCR and immunohistochemistry were performed to detect the expression of SKIP in clinical bladder cancer samples. In addition, the correlation of SKIP expression and clinicopathological features and clinical outcomes were analyzed. The expression levels of SKIP in clinical bladder cancer were much higher than that in paired adjacent noncancerous tissues. High expression of SKIP was closely related with histological grades and the poor prognosis of bladder cancer. Based on our data, we speculated that SKIP may be a potential prognostic marker in bladder cancer.
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Affiliation(s)
- Longwang Wang
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
| | - Mei Zhang
- Department of Neurology, Wuhan Central HospitalHubei Province, 430014, China
| | - Yong Wu
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
| | - Cheng Cheng
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
| | - Yawei Huang
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
| | - Zimin Shi
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
| | - Hongwei Huang
- Department of Urology, The Second Affiliated Hospital of Nanchang UniversityNanchang 330006, China
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