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Pierzynska-Mach A, Czada C, Vogel C, Gwosch E, Osswald X, Bartoschek D, Diaspro A, Kappes F, Ferrando-May E. DEK oncoprotein participates in heterochromatin replication via SUMO-dependent nuclear bodies. J Cell Sci 2023; 136:jcs261329. [PMID: 37997922 PMCID: PMC10753498 DOI: 10.1242/jcs.261329] [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: 05/12/2023] [Accepted: 11/17/2023] [Indexed: 11/25/2023] Open
Abstract
The correct inheritance of chromatin structure is key for maintaining genome function and cell identity and preventing cellular transformation. DEK, a conserved non-histone chromatin protein, has recognized tumor-promoting properties, its overexpression being associated with poor prognosis in various cancer types. At the cellular level, DEK displays pleiotropic functions, influencing differentiation, apoptosis and stemness, but a characteristic oncogenic mechanism has remained elusive. Here, we report the identification of DEK bodies, focal assemblies of DEK that regularly occur at specific, yet unidentified, sites of heterochromatin replication exclusively in late S-phase. In these bodies, DEK localizes in direct proximity to active replisomes in agreement with a function in the early maturation of heterochromatin. A high-throughput siRNA screen, supported by mutational and biochemical analyses, identifies SUMO as one regulator of DEK body formation, linking DEK to the complex SUMO protein network that controls chromatin states and cell fate. This work combines and refines our previous data on DEK as a factor essential for heterochromatin integrity and facilitating replication under stress, and delineates an avenue of further study for unraveling the contribution of DEK to cancer development.
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Affiliation(s)
| | - Christina Czada
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
| | - Christopher Vogel
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
| | - Eva Gwosch
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
| | - Xenia Osswald
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
| | - Denis Bartoschek
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
| | - Alberto Diaspro
- Nanoscopy & NIC@IIT, Istituto Italiano di Tecnologia, Genoa 16152, Italy
- DIFILAB, Department of Physics, University of Genoa, Genoa 16146, Italy
| | - Ferdinand Kappes
- Duke Kunshan University, Division of Natural and Applied Sciences, Kunshan 215316, People's Republic of China
| | - Elisa Ferrando-May
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz 78464, Germany
- German Cancer Research Center, Heidelberg 69120, Germany
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2
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Porubiaková O, Havlík J, Indu, Šedý M, Přepechalová V, Bartas M, Bidula S, Šťastný J, Fojta M, Brázda V. Variability of Inverted Repeats in All Available Genomes of Bacteria. Microbiol Spectr 2023; 11:e0164823. [PMID: 37358458 PMCID: PMC10434271 DOI: 10.1128/spectrum.01648-23] [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: 04/21/2023] [Accepted: 06/03/2023] [Indexed: 06/27/2023] Open
Abstract
Noncanonical secondary structures in nucleic acids have been studied intensively in recent years. Important biological roles of cruciform structures formed by inverted repeats (IRs) have been demonstrated in diverse organisms, including humans. Using Palindrome analyser, we analyzed IRs in all accessible bacterial genome sequences to determine their frequencies, lengths, and localizations. IR sequences were identified in all species, but their frequencies differed significantly across various evolutionary groups. We detected 242,373,717 IRs in all 1,565 bacterial genomes. The highest mean IR frequency was detected in the Tenericutes (61.89 IRs/kbp) and the lowest mean frequency was found in the Alphaproteobacteria (27.08 IRs/kbp). IRs were abundant near genes and around regulatory, tRNA, transfer-messenger RNA (tmRNA), and rRNA regions, pointing to the importance of IRs in such basic cellular processes as genome maintenance, DNA replication, and transcription. Moreover, we found that organisms with high IR frequencies were more likely to be endosymbiotic, antibiotic producing, or pathogenic. On the other hand, those with low IR frequencies were far more likely to be thermophilic. This first comprehensive analysis of IRs in all available bacterial genomes demonstrates their genomic ubiquity, nonrandom distribution, and enrichment in genomic regulatory regions. IMPORTANCE Our manuscript reports for the first time a complete analysis of inverted repeats in all fully sequenced bacterial genomes. Thanks to the availability of unique computational resources, we were able to statistically evaluate the presence and localization of these important regulatory sequences in bacterial genomes. This work revealed a strong abundance of these sequences in regulatory regions and provides researchers with a valuable tool for their manipulation.
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Affiliation(s)
- Otília Porubiaková
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
| | - Jan Havlík
- Mendel University in Brno, Brno, Czech Republic
| | - Indu
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Michal Šedý
- Brno University of Technology, Faculty of Chemistry, Brno, Czech Republic
| | - Veronika Přepechalová
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
- Brno University of Technology, Faculty of Chemistry, Brno, Czech Republic
| | - Martin Bartas
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Stefan Bidula
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - Jiří Šťastný
- Mendel University in Brno, Brno, Czech Republic
- Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic
| | - Miroslav Fojta
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
| | - Václav Brázda
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
- Brno University of Technology, Faculty of Chemistry, Brno, Czech Republic
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3
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Greene AN, Solomon MB, Privette Vinnedge LM. Novel molecular mechanisms in Alzheimer’s disease: The potential role of DEK in disease pathogenesis. Front Aging Neurosci 2022; 14:1018180. [PMID: 36275000 PMCID: PMC9582447 DOI: 10.3389/fnagi.2022.1018180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 09/20/2022] [Indexed: 11/13/2022] Open
Abstract
Alzheimer’s disease and age-related dementias (AD/ADRD) are debilitating diseases that exact a significant physical, emotional, cognitive, and financial toll on the individual and their social network. While genetic risk factors for early-onset AD have been identified, the molecular and genetic drivers of late-onset AD, the most common subtype, remain a mystery. Current treatment options are limited for the 35 million people in the United States with AD/ADRD. Thus, it is critically important to identify novel molecular mechanisms of dementia-related pathology that may be targets for the development of new interventions. Here, we summarize the overarching concepts regarding AD/ADRD pathogenesis. Then, we highlight one potential molecular driver of AD/ADRD, the chromatin remodeling protein DEK. We discuss in vitro, in vivo, and ex vivo findings, from our group and others, that link DEK loss with the cellular, molecular, and behavioral signatures of AD/ADRD. These include associations between DEK loss and cellular and molecular hallmarks of AD/ADRD, including apoptosis, Tau expression, and Tau hyperphosphorylation. We also briefly discuss work that suggests sex-specific differences in the role of DEK in AD/ADRD pathogenesis. Finally, we discuss future directions for exploiting the DEK protein as a novel player and potential therapeutic target for the treatment of AD/ADRD.
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Affiliation(s)
- Allie N. Greene
- Neuroscience Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Matia B. Solomon
- Neuroscience Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH, United States
- Department of Psychology, University of Cincinnati, Cincinnati, OH, United States
| | - Lisa M. Privette Vinnedge
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States
- *Correspondence: Lisa M. Privette Vinnedge,
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4
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Capitano ML, Sammour Y, Ropa J, Legendre M, Mor‐Vaknin N, Markovitz DM. DEK, a nuclear protein, is chemotactic for hematopoietic stem/progenitor cells acting through CXCR2 and Gαi signaling. J Leukoc Biol 2022; 112:449-456. [PMID: 35137444 PMCID: PMC9541944 DOI: 10.1002/jlb.3ab1120-740r] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/16/2021] [Accepted: 12/21/2021] [Indexed: 12/17/2022] Open
Abstract
Few cytokines/growth modulating proteins are known to be chemoattractants for hematopoietic stem (HSC) and progenitor cells (HPC); stromal cell-derived factor 1α (SDF1α/CXCL12) being the most potent known such protein. DEK, a nuclear DNA-binding chromatin protein with hematopoietic cytokine-like activity, is a chemotactic factor attracting mature immune cells. Transwell migration assays were performed to test whether DEK serves as a chemotactic agent for HSC/HPC. DEK induced dose- and time-dependent directed migration of lineage negative (Lin- ) Sca-1+ c-Kit+ (LSK) bone marrow (BM) cells, HSCs and HPCs. Checkerboard assays demonstrated that DEK's activity was chemotactic (directed), not chemokinetic (random migration), in nature. DEK and SDF1α compete for HSC/HPC chemotaxis. Blocking CXCR2 with neutralizing antibodies or inhibiting Gαi protein signaling with Pertussis toxin pretreatment inhibited migration of LSK cells toward DEK. Thus, DEK is a novel and rare chemotactic agent for HSC/HPC acting in a direct or indirect CXCR2 and Gαi protein-coupled signaling-dependent manner.
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Affiliation(s)
- Maegan L. Capitano
- Department of Microbiology and ImmunologyIndiana University School of MedicineIndianapolisIndianaUSA
| | - Yasser Sammour
- Department of Microbiology and ImmunologyIndiana University School of MedicineIndianapolisIndianaUSA
| | - James Ropa
- Department of Microbiology and ImmunologyIndiana University School of MedicineIndianapolisIndianaUSA
| | - Maureen Legendre
- Department of Internal Medicine, Division of Infectious DiseasesUniversity of MichiganAnn ArborMichiganUSA
| | - Nirit Mor‐Vaknin
- Department of Internal Medicine, Division of Infectious DiseasesUniversity of MichiganAnn ArborMichiganUSA
| | - David M. Markovitz
- Department of Internal Medicine, Division of Infectious DiseasesUniversity of MichiganAnn ArborMichiganUSA
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5
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Liu B, Sun Y, Zhang Y, Xing Y, Suo J. DEK modulates both expression and alternative splicing of cancer‑related genes. Oncol Rep 2022; 47:111. [PMID: 35475534 PMCID: PMC9073418 DOI: 10.3892/or.2022.8322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 04/11/2022] [Indexed: 11/05/2022] Open
Abstract
DEK is known to be a potential proto‑oncogene and is highly expressed in gastric cancer (GC); thus, DEK is considered to contribute to the malignant progression of GC. DEK is an RNA‑binding protein involved in transcription, DNA repair, and selection of splicing sites during mRNA processing; however, its precise function remains elusive due to the lack of clarification of the overall profiles of gene transcription and post‑transcriptional splicing that are regulated by DEK. We performed our original whole‑genomic RNA‑Seq data to analyze the global transcription and alternative splicing profiles in a human GC cell line by comparing DEK siRNA‑treated and control conditions, dissecting both differential gene expression and potential alternative splicing events regulated by DEK. The siRNA‑mediated knockdown of DEK in a GC cell line led to significant changes in gene expression of multiple cancer‑related genes including both oncogenes and tumor suppressors. Moreover, it was revealed that DEK regulated a number of alternative splicing in genes which were significantly enriched in various cancer‑related pathways including apoptosis and cell cycle processes. This study clarified for the first time that DEK has a regulatory effect on the alternative splicing, as well as on the expression, of numerous cancer‑related genes, which is consistent with the role of DEK as a possible oncogene. Our results further expand the importance and feasibility of DEK as a clinical therapeutic target for human malignancies including GC.
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Affiliation(s)
- Bin Liu
- Department of Gastrocolorectal Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yuanlin Sun
- Department of Gastrocolorectal Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yang Zhang
- Department of Gastrocolorectal Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yanpeng Xing
- Department of Gastrocolorectal Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Jian Suo
- Department of Gastrocolorectal Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
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6
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Structural switching/polymorphism by sequential base substitution at quasi-palindromic SNP site (G → A) in LCR of human β-globin gene cluster. Int J Biol Macromol 2021; 201:216-225. [PMID: 34973267 DOI: 10.1016/j.ijbiomac.2021.12.142] [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: 10/14/2021] [Revised: 12/21/2021] [Accepted: 12/21/2021] [Indexed: 11/20/2022]
Abstract
The human β-globin gene Locus Control Region (LCR), a dominant regulator of globin gene expression contains five tissue-specific DNase I-hypersensitive sites (HSs). A single nucleotide polymorphism (SNP) (A → G) present in HS4 region of locus control region (LCR), have shown a notable association between the G allele and the occurrence of β-thalassemia. This SNP site exhibiting a hairpin - duplex equilibrium manifested in A → B like DNA transition has previously been reported from this laboratory. Since, DNA is a dynamic and adaptable molecule, so any change of a single base within a primary DNA sequence can produce major biological consequences commonly manifested in genetic disorders such as sickle cell anemia and β-thalassemia. Herein, the differential behavior of sequential single base substitutions G → A on the quasi-palindromic sequence (d-TGGGGGCCCCA; HPG11) has been explored. A combination of native gel electrophoresis, circular dichroism (CD), and UV-thermal denaturation (Tm) techniques have been used to investigate the structural polymorphism associated with various variants of HPG11 i.e. HPG11A2 to HPG11A5. The CD spectra confirmed that all the HPG11 variants exhibit a hairpin - duplex equilibrium. Oligomer concentration dependence on CD spectra has been correlated with A → B DNA conformational transition. However, as revealed in gel electrophoresis, HPG11A2 → A5 exhibit the formation of a tetramolecular structure (four-way junction) at higher oligomer concentration. UV-melting studies also supported the melting of hairpin, duplex and four-way junction structure. This polymorphism pattern may possibly be significant for DNA-protein recognition, in the process of regulation of LCR in the β-globin gene.
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7
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Ravichandran S, Razzaq M, Parveen N, Ghosh A, Kim KK. The effect of hairpin loop on the structure and gene expression activity of the long-loop G-quadruplex. Nucleic Acids Res 2021; 49:10689-10706. [PMID: 34450640 PMCID: PMC8501965 DOI: 10.1093/nar/gkab739] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/10/2021] [Accepted: 08/24/2021] [Indexed: 12/29/2022] Open
Abstract
G-quadruplex (G4), a four-stranded DNA or RNA structure containing stacks of guanine tetrads, plays regulatory roles in many cellular functions. So far, conventional G4s containing loops of 1–7 nucleotides have been widely studied. Increasing experimental evidence suggests that unconventional G4s, such as G4s containing long loops (long-loop G4s), play a regulatory role in the genome by forming a stable structure. Other secondary structures such as hairpins in the loop might thus contribute to the stability of long-loop G4s. Therefore, investigation of the effect of the hairpin-loops on the structure and function of G4s is required. In this study, we performed a systematic biochemical investigation of model G4s containing long loops with various sizes and structures. We found that the long-loop G4s are less stable than conventional G4s, but their stability increased when the loop forms a hairpin (hairpin-G4). We also verified the biological significance of hairpin-G4s by showing that hairpin-G4s present in the genome also form stable G4s and regulate gene expression as confirmed by in cellulo reporter assays. This study contributes to expanding the scope and diversity of G4s, thus facilitating future studies on the role of G4s in the human genome.
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Affiliation(s)
- Subramaniyam Ravichandran
- Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Maria Razzaq
- Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Nazia Parveen
- Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Ambarnil Ghosh
- Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Kyeong Kyu Kim
- Department of Precision Medicine, Graduate School of Basic Medical Science (GSBMS), Institute for Antimicrobial Resistance Research and Therapeutics, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
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8
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Guo H, Prell M, Königs H, Xu N, Waldmann T, Hermans-Sachweh B, Ferrando-May E, Lüscher B, Kappes F. Bacterial Growth Inhibition Screen (BGIS) identifies a loss-of-function mutant of the DEK oncogene, indicating DNA modulating activities of DEK in chromatin. FEBS Lett 2021; 595:1438-1453. [PMID: 33686684 DOI: 10.1002/1873-3468.14070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 02/26/2021] [Indexed: 02/06/2023]
Abstract
The DEK oncoprotein regulates cellular chromatin function via a number of protein-protein interactions. However, the biological relevance of its unique pseudo-SAP/SAP-box domain, which transmits DNA modulating activities in vitro, remains largely speculative. As hypothesis-driven mutations failed to yield DNA-binding null (DBN) mutants, we combined random mutagenesis with the Bacterial Growth Inhibition Screen (BGIS) to overcome this bottleneck. Re-expression of a DEK-DBN mutant in newly established human DEK knockout cells failed to reduce the increase in nuclear size as compared to wild type, indicating roles for DEK-DNA interactions in cellular chromatin organization. Our results extend the functional roles of DEK in metazoan chromatin and highlight the predictive ability of recombinant protein toxicity in E. coli for unbiased studies of eukaryotic DNA modulating protein domains.
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Affiliation(s)
- Haihong Guo
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Malte Prell
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Hiltrud Königs
- Institute of Pathology, Medical School, RWTH Aachen University, Germany
| | - Nengwei Xu
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Dushu Lake Higher Education Town, Suzhou Industrial Park, China
| | - Tanja Waldmann
- Doerenkamp-Zbinden Chair for In Vitro Toxicology and Biomedicine, University of Konstanz, Germany
| | | | - Elisa Ferrando-May
- Bioimaging Center, Department of Biology, University of Konstanz, Germany
| | - Bernhard Lüscher
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Ferdinand Kappes
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Dushu Lake Higher Education Town, Suzhou Industrial Park, China
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9
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Guo H, Xu N, Prell M, Königs H, Hermanns-Sachweh B, Lüscher B, Kappes F. Bacterial Growth Inhibition Screen (BGIS): harnessing recombinant protein toxicity for rapid and unbiased interrogation of protein function. FEBS Lett 2021; 595:1422-1437. [PMID: 33704777 DOI: 10.1002/1873-3468.14072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 02/28/2021] [Accepted: 03/02/2021] [Indexed: 12/13/2022]
Abstract
In two proof-of-concept studies, we established and validated the Bacterial Growth Inhibition Screen (BGIS), which explores recombinant protein toxicity in Escherichia coli as a largely overlooked and alternative means for basic characterization of functional eukaryotic protein domains. By applying BGIS, we identified an unrecognized RNA-interacting domain in the DEK oncoprotein (this study) and successfully combined BGIS with random mutagenesis as a screening tool for loss-of-function mutants of the DNA modulating domain of DEK [1]. Collectively, our findings shed new light on the phenomenon of recombinant protein toxicity in E. coli. Given the easy and rapid implementation and wide applicability, BGIS will extend the repertoire of basic methods for the identification, analysis and unbiased manipulation of proteins.
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Affiliation(s)
- Haihong Guo
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Nengwei Xu
- Department of Biological Sciences, Suzhou Dushu Lake Science and Education Innovation District, Suzhou Industrial Park, Xi'an Jiaotong-Liverpool University, Suzhou, China
| | - Malte Prell
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Hiltrud Königs
- Institute of Pathology, Medical School, RWTH Aachen University, Germany
| | | | - Bernhard Lüscher
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
| | - Ferdinand Kappes
- Institute for Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Germany
- Department of Biological Sciences, Suzhou Dushu Lake Science and Education Innovation District, Suzhou Industrial Park, Xi'an Jiaotong-Liverpool University, Suzhou, China
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10
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Zhang H, Yan M, Deng R, Song F, Jiang M. The silencing of DEK reduced disease resistance against Botrytis cinerea and Pseudomonas syringae pv. tomato DC3000 based on virus-induced gene silencing analysis in tomato. Gene 2020; 727:144245. [PMID: 31715302 DOI: 10.1016/j.gene.2019.144245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 10/29/2019] [Accepted: 10/29/2019] [Indexed: 10/25/2022]
Abstract
DEK involves in the modulation of cell proliferation, differentiation, apoptosis, migration and cell senescence. However, direct genetic evidence proving the functions of DEK in disease resistance against pathogens is still deficient. In the present study, four DEKs were identified in tomato genome and their roles in disease resistance in tomato were analyzed. The expression levels of DEKs were differently induced by Botrytis cinerea, Pseudomonas syringae pv. tomato (Pst) DC3000 and defense-related signaling molecules (such as jasmonic acid, aethylene precursor and salicylic acid). The DEKs' silencing by virus induced gene silencing led to decreased resistance against B. cinerea or Pst DC3000. The underlying mechanisms may be through the upregulation of the accumulation of reactive oxygen species (ROS) and the changed expression levels of defense-related genes by pathogen inoculation. These results indicate that DEKs involve in disease resistance against different pathogens and thus broaden the knowledge of DEK genes' function in tomato.
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Affiliation(s)
- Huijuan Zhang
- Collegue of Life Science, Taizhou University, Taizhou, China
| | - Mengjiao Yan
- Collegue of Life Science, Taizhou University, Taizhou, China
| | - Rong Deng
- Collegue of Life Science, Taizhou University, Taizhou, China
| | - Fengming Song
- National Key Laboratory for Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Ming Jiang
- Collegue of Life Science, Taizhou University, Taizhou, China.
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11
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Ganz M, Vogel C, Czada C, Jörke V, Gwosch EC, Kleiner R, Pierzynska-Mach A, Zanacchi FC, Diaspro A, Kappes F, Bürkle A, Ferrando-May E. The oncoprotein DEK affects the outcome of PARP1/2 inhibition during mild replication stress. PLoS One 2019; 14:e0213130. [PMID: 31408463 PMCID: PMC6692024 DOI: 10.1371/journal.pone.0213130] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 07/03/2019] [Indexed: 01/07/2023] Open
Abstract
DNA replication stress is a major source of genomic instability and is closely linked to tumor formation and progression. Poly(ADP-ribose)polymerases1/2 (PARP1/2) enzymes are activated in response to replication stress resulting in poly(ADP-ribose) (PAR) synthesis. PARylation plays an important role in the remodelling and repair of impaired replication forks, providing a rationale for targeting highly replicative cancer cells with PARP1/2 inhibitors. The human oncoprotein DEK is a unique, non-histone chromatin architectural protein whose deregulated expression is associated with the development of a wide variety of human cancers. Recently, we showed that DEK is a high-affinity target of PARylation and that it promotes the progression of impaired replication forks. Here, we investigated a potential functional link between PAR and DEK in the context of replication stress. Under conditions of mild replication stress induced either by topoisomerase1 inhibition with camptothecin or nucleotide depletion by hydroxyurea, we found that the effect of acute PARP1/2 inhibition on replication fork progression is dependent on DEK expression. Reducing DEK protein levels also overcomes the restart impairment of stalled forks provoked by blocking PARylation. Non-covalent DEK-PAR interaction via the central PAR-binding domain of DEK is crucial for counteracting PARP1/2 inhibition as shown for the formation of RPA positive foci in hydroxyurea treated cells. Finally, we show by iPOND and super resolved microscopy that DEK is not directly associated with the replisome since it binds to DNA at the stage of chromatin formation. Our report sheds new light on the still enigmatic molecular functions of DEK and suggests that DEK expression levels may influence the sensitivity of cancer cells to PARP1/2 inhibitors.
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Affiliation(s)
- Magdalena Ganz
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Christopher Vogel
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Christina Czada
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Vera Jörke
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Eva Christina Gwosch
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Rebecca Kleiner
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
| | - Agnieszka Pierzynska-Mach
- Nanoscopy and NIC@IIT, Istituto Italiano di Tecnologia, Genoa, Italy
- Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
| | - Francesca Cella Zanacchi
- Nanoscopy and NIC@IIT, Istituto Italiano di Tecnologia, Genoa, Italy
- Biophysics Institute (IBF), National Research Council (CNR), Genoa, Italy
| | - Alberto Diaspro
- Nanoscopy and NIC@IIT, Istituto Italiano di Tecnologia, Genoa, Italy
- DIFILAB, Department of Physics, University of Genoa, Genoa, Italy
| | - Ferdinand Kappes
- Xi’an Jiaotong-Liverpool University, Dushu Lake Higher Education Town, Suzhou, China
| | - Alexander Bürkle
- Department of Biology, Molecular Toxicology Group, University of Konstanz, Konstanz, Germany
| | - Elisa Ferrando-May
- Department of Biology, Bioimaging Center, University of Konstanz, Konstanz, Germany
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12
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Fischbach A, Krüger A, Hampp S, Assmann G, Rank L, Hufnagel M, Stöckl MT, Fischer JMF, Veith S, Rossatti P, Ganz M, Ferrando-May E, Hartwig A, Hauser K, Wiesmüller L, Bürkle A, Mangerich A. The C-terminal domain of p53 orchestrates the interplay between non-covalent and covalent poly(ADP-ribosyl)ation of p53 by PARP1. Nucleic Acids Res 2019; 46:804-822. [PMID: 29216372 PMCID: PMC5778597 DOI: 10.1093/nar/gkx1205] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 11/22/2017] [Indexed: 01/25/2023] Open
Abstract
The post-translational modification poly(ADP-ribosyl)ation (PARylation) plays key roles in genome maintenance and transcription. Both non-covalent poly(ADP-ribose) binding and covalent PARylation control protein functions, however, it is unknown how the two modes of modification crosstalk mechanistically. Employing the tumor suppressor p53 as a model substrate, this study provides detailed insights into the interplay between non-covalent and covalent PARylation and unravels its functional significance in the regulation of p53. We reveal that the multifunctional C-terminal domain (CTD) of p53 acts as the central hub in the PARylation-dependent regulation of p53. Specifically, p53 bound to auto-PARylated PARP1 via highly specific non–covalent PAR-CTD interaction, which conveyed target specificity for its covalent PARylation by PARP1. Strikingly, fusing the p53-CTD to a protein that is normally not PARylated, renders this a target for covalent PARylation as well. Functional studies revealed that the p53–PAR interaction had substantial implications on molecular and cellular levels. Thus, PAR significantly influenced the complex p53–DNA binding properties and controlled p53 functions, with major implications on the p53-dependent interactome, transcription, and replication-associated recombination. Remarkably, this mechanism potentially also applies to other PARylation targets, since a bioinformatics analysis revealed that CTD-like regions are highly enriched in the PARylated proteome.
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Affiliation(s)
- Arthur Fischbach
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany.,Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Annika Krüger
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany.,Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany.,Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Stephanie Hampp
- Department of Obstetrics and Gynaecology, University of Ulm, 89075 Ulm, Germany
| | - Greta Assmann
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany.,Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Lisa Rank
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Matthias Hufnagel
- Department of Food Chemistry and Toxicology, Institute for Applied Biosciences, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Martin T Stöckl
- Bioimaging Center, Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Jan M F Fischer
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany.,Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Sebastian Veith
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany.,Research Training Group 1331, University of Konstanz, 78457 Konstanz, Germany
| | - Pascal Rossatti
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Magdalena Ganz
- Bioimaging Center, Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Elisa Ferrando-May
- Bioimaging Center, Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Andrea Hartwig
- Department of Food Chemistry and Toxicology, Institute for Applied Biosciences, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Karin Hauser
- Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Lisa Wiesmüller
- Department of Obstetrics and Gynaecology, University of Ulm, 89075 Ulm, Germany
| | - Alexander Bürkle
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Aswin Mangerich
- Department of Biology, University of Konstanz, 78457 Konstanz, Germany
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13
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Capitano ML, Mor-Vaknin N, Saha AK, Cooper S, Legendre M, Guo H, Contreras-Galindo R, Kappes F, Sartor MA, Lee CT, Huang X, Markovitz DM, Broxmeyer HE. Secreted nuclear protein DEK regulates hematopoiesis through CXCR2 signaling. J Clin Invest 2019; 129:2555-2570. [PMID: 31107242 PMCID: PMC6546479 DOI: 10.1172/jci127460] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/19/2019] [Indexed: 12/13/2022] Open
Abstract
The nuclear protein DEK is an endogenous DNA-binding chromatin factor regulating hematopoiesis. DEK is one of only 2 known secreted nuclear chromatin factors, but whether and how extracellular DEK regulates hematopoiesis is not known. We demonstrated that extracellular DEK greatly enhanced ex vivo expansion of cytokine-stimulated human and mouse hematopoietic stem cells (HSCs) and regulated HSC and hematopoietic progenitor cell (HPC) numbers in vivo and in vitro as determined both phenotypically (by flow cytometry) and functionally (through transplantation and colony formation assays). Recombinant DEK increased long-term HSC numbers and decreased HPC numbers through a mechanism mediated by the CXC chemokine receptor CXCR2 and heparan sulfate proteoglycans (HSPGs) (as determined utilizing Cxcr2-/- mice, blocking CXCR2 antibodies, and 3 different HSPG inhibitors) that was associated with enhanced phosphorylation of ERK1/2, AKT, and p38 MAPK. To determine whether extracellular DEK required nuclear function to regulate hematopoiesis, we utilized 2 mutant forms of DEK: one that lacked its nuclear translocation signal and one that lacked DNA-binding ability. Both altered HSC and HPC numbers in vivo or in vitro, suggesting the nuclear function of DEK is not required. Thus, DEK acts as a hematopoietic cytokine, with the potential for clinical applicability.
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Affiliation(s)
- Maegan L. Capitano
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Nirit Mor-Vaknin
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Anjan K. Saha
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Scott Cooper
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Maureen Legendre
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Haihong Guo
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Aachen, Germany
| | - Rafael Contreras-Galindo
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Ferdinand Kappes
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Aachen, Germany
- Department of Biological Sciences, Xi’an Jiaotong-Liverpool University, Suzhou, China
| | - Maureen A. Sartor
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, Michigan, USA
- Department of Biostatistics, University of Michigan, Ann Arbor, Michigan, USA
| | - Christopher T. Lee
- Department of Biostatistics, University of Michigan, Ann Arbor, Michigan, USA
| | - Xinxin Huang
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - David M. Markovitz
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Hal E. Broxmeyer
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
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14
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Bartas M, Bažantová P, Brázda V, Liao JC, Červeň J, Pečinka P. Identification of Distinct Amino Acid Composition of Human Cruciform Binding Proteins. Mol Biol 2019. [DOI: 10.1134/s0026893319010023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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O'Donovan SM, Franco-Villanueva A, Ghisays V, Caldwell JL, Haroutunian V, Privette Vinnedge LM, McCullumsmith RE, Solomon MB. Sex differences in DEK expression in the anterior cingulate cortex and its association with dementia severity in schizophrenia. Schizophr Res 2018; 202:188-194. [PMID: 30017458 PMCID: PMC6289789 DOI: 10.1016/j.schres.2018.07.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 05/08/2018] [Accepted: 07/01/2018] [Indexed: 01/23/2023]
Abstract
DEK is a chromatin-remodeling phosphoprotein found in most human tissues, but its expression and function in the human brain is largely unknown. DEK depletion in vitro induces cellular and molecular anomalies associated with cognitive impairment, including down-regulation of the canonical Wnt/β-catenin signaling pathway. ToppGene analyses link DEK loss to genes associated with various dementias and age-related cognitive decline. To examine the role of DEK in cognitive impairment in severe mental illness, DEK protein expression was assayed by immunoblot in the anterior cingulate cortex (ACC) of subjects with schizophrenia. Cognitive impairment is a core feature of schizophrenia and cognitive function in subjects was assessed antemortem using the clinical dementia rating (CDR) scale. DEK protein expression was not significantly altered in schizophrenia (n = 20) compared to control subjects (n = 20). Further analysis revealed significant reduction in DEK protein expression in women with schizophrenia, and a significant increase in expression in men with schizophrenia, relative to their same-sex controls. DEK protein expression levels were inversely correlated with dementia severity in women. Conversely, in men, DEK protein expression and dementia severity were positively correlated. Notably, there was no sex difference in DEK protein expression in the control group, suggesting that this sex difference is specific to schizophrenia and not due to inherent differences in DEK expression between males and females. These results suggest a novel, sex-specific role for DEK in cognitive performance and highlight a putative sex-specific link between central nervous system DEK protein expression and a neuropsychiatric disease that is commonly associated with cognitive impairment.
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Affiliation(s)
- Sinead M O'Donovan
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH 45237, USA
| | - Ana Franco-Villanueva
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH 45237, USA
| | - Valentina Ghisays
- Department of Psychology Experimental Psychology Graduate Program University of Cincinnati, Cincinnati, OH 45221, USA
| | - Jody L Caldwell
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH 45237, USA
| | - Vahraim Haroutunian
- Department of Psychiatry and Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lisa M Privette Vinnedge
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Robert E McCullumsmith
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH 45237, USA
| | - Matia B Solomon
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH 45237, USA; Department of Psychology Experimental Psychology Graduate Program University of Cincinnati, Cincinnati, OH 45221, USA.
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16
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de Albuquerque Oliveira AC, Kappes F, Martins DBG, de Lima Filho JL. The unique DEK oncoprotein in women's health: A potential novel biomarker. Biomed Pharmacother 2018; 106:142-148. [PMID: 29957464 DOI: 10.1016/j.biopha.2018.06.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 06/13/2018] [Accepted: 06/14/2018] [Indexed: 12/20/2022] Open
Abstract
Breast and cervical cancer are the first and fourth cancer types with the highest prevalence in women, respectively. The developmental profiles of cancer in women can vary by genetic markers and cellular events. In turn, age and lifestyle influence in the cellular response and also on the cancer progression and relapse. The human DEK protein, a histone chaperone, belongs to a specific subclass of chromatin topology modulators, being involved in the regulation of DNA-dependent processes. These epigenetic mechanisms have dynamic and reversible nature, have been proposed as targets for different treatment approaches, especially in tumor therapy. The expression patterns of DEK vary between healthy and cancer cells. High expression of DEK is associated with poor prognosis in many cancer types, suggesting that DEK takes part in oncogenic activities via different molecular pathways, including inhibition of senescence and apoptosis. The focus of this review was to highlight the role of the DEK protein in these two female cancers.
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Affiliation(s)
- Ana Cecília de Albuquerque Oliveira
- Molecular Prospecting and Bioinformatics Group - Laboratory of Immunopathology Keizo Asami (LIKA) - Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, Postal Code 50670-901, Brazil
| | - Ferdinand Kappes
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University No 111, Ren Ai Road, Dushu Lake Higher Education Town, Suzhou Industrial Park (SIP), Suzhou, 215123, PR China
| | - Danyelly Bruneska Gondim Martins
- Molecular Prospecting and Bioinformatics Group - Laboratory of Immunopathology Keizo Asami (LIKA) - Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, Postal Code 50670-901, Brazil; Department of Biochemistry - Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, Postal Code 50670-901, Brazil.
| | - José Luiz de Lima Filho
- Molecular Prospecting and Bioinformatics Group - Laboratory of Immunopathology Keizo Asami (LIKA) - Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, Postal Code 50670-901, Brazil; Department of Biochemistry - Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, PE, Postal Code 50670-901, Brazil
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17
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Matrka MC, Cimperman KA, Haas SR, Guasch G, Ehrman LA, Waclaw RR, Komurov K, Lane A, Wikenheiser-Brokamp KA, Wells SI. Dek overexpression in murine epithelia increases overt esophageal squamous cell carcinoma incidence. PLoS Genet 2018; 14:e1007227. [PMID: 29538372 PMCID: PMC5884580 DOI: 10.1371/journal.pgen.1007227] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 04/04/2018] [Accepted: 01/26/2018] [Indexed: 12/12/2022] Open
Abstract
Esophageal cancer occurs as either squamous cell carcinoma (ESCC) or adenocarcinoma. ESCCs comprise almost 90% of cases worldwide, and recur with a less than 15% five-year survival rate despite available treatments. The identification of new ESCC drivers and therapeutic targets is critical for improving outcomes. Here we report that expression of the human DEK oncogene is strongly upregulated in esophageal SCC based on data in the cancer genome atlas (TCGA). DEK is a chromatin-associated protein with important roles in several nuclear processes including gene transcription, epigenetics, and DNA repair. Our previous data have utilized a murine knockout model to demonstrate that Dek expression is required for oral and esophageal SCC growth. Also, DEK overexpression in human keratinocytes, the cell of origin for SCC, was sufficient to cause hyperplasia in 3D organotypic raft cultures that mimic human skin, thus linking high DEK expression in keratinocytes to oncogenic phenotypes. However, the role of DEK over-expression in ESCC development remains unknown in human cells or genetic mouse models. To define the consequences of Dek overexpression in vivo, we generated and validated a tetracycline responsive Dek transgenic mouse model referred to as Bi-L-Dek. Dek overexpression was induced in the basal keratinocytes of stratified squamous epithelium by crossing Bi-L-Dek mice to keratin 5 tetracycline transactivator (K5-tTA) mice. Conditional transgene expression was validated in the resulting Bi-L-Dek_K5-tTA mice and was suppressed with doxycycline treatment in the tetracycline-off system. The mice were subjected to an established HNSCC and esophageal carcinogenesis protocol using the chemical carcinogen 4-nitroquinoline 1-oxide (4NQO). Dek overexpression stimulated gross esophageal tumor development, when compared to doxycycline treated control mice. Furthermore, high Dek expression caused a trend toward esophageal hyperplasia in 4NQO treated mice. Taken together, these data demonstrate that Dek overexpression in the cell of origin for SCC is sufficient to promote esophageal SCC development in vivo.
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Affiliation(s)
- Marie C. Matrka
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Katherine A. Cimperman
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Sarah R. Haas
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Geraldine Guasch
- Centre de Recherche en Cancérologie de Marseille (CRCM), Inserm, U1068, CNRS, UMR7258, Institute Paoli-Calmettes, Aix-Marseille University, Marseille, France
| | - Lisa A. Ehrman
- Division of Experimental Hematology & Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Ronald R. Waclaw
- Division of Experimental Hematology & Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Kakajan Komurov
- Division of Experimental Hematology & Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Adam Lane
- Division of Bone Marrow Transplant and Immune Deficiency, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States of America
| | - Kathryn A. Wikenheiser-Brokamp
- Division of Pathology & Laboratory Medicine and Perinatal Institute Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center and Department of Pathology & Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, United States of America
| | - Susanne I. Wells
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
- Division of Experimental Hematology & Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
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18
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Roles of DEK in the endometrium of mice in early pregnancy. Gene 2018; 642:261-267. [PMID: 29109007 DOI: 10.1016/j.gene.2017.11.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 10/12/2017] [Accepted: 11/02/2017] [Indexed: 12/11/2022]
Abstract
Embryo implantation is a complex process requiring reciprocal interactions between implantation-competent blastocysts and receptive uteri. Accumulating evidence from Digital Protein Expression Profiling indicates that DEK protein expression at implantation sites (ISs) was much higher than that at inter-implantation sites (IISs). In this study, we investigated the expression of DEK in mouse uterus by immunohistochemistry (IHC), Western blotting. We explored its function during decidualization of uterine stromal cells by inhibiting the expression of DEK. In further study of mechanism, the cell proliferation, apoptosis and DNA damage were detected after inhibiting DEK during decidualization of stromal cells. The results suggest that DEK participates in decidualization of stromal cells through mediating cell proliferation, apoptosis and DNA repair.
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19
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Serrano-Lopez J, Nattamai K, Pease NA, Shephard MS, Wellendorf AM, Sertorio M, Smith EA, Geiger H, Wells SI, Cancelas JA, Privette Vinnedge LM. Loss of DEK induces radioresistance of murine restricted hematopoietic progenitors. Exp Hematol 2017; 59:40-50.e3. [PMID: 29288703 DOI: 10.1016/j.exphem.2017.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 12/15/2017] [Accepted: 12/19/2017] [Indexed: 11/18/2022]
Abstract
Self-renewing hematopoietic stem cells and multipotent progenitor cells are responsible for maintaining hematopoiesis throughout an individual's lifetime. For overall health and survival, it is critical that the genome stability of these cells is maintained and that the cell population is not exhausted. Previous reports have indicated that the DEK protein, a chromatin structural protein that functions in numerous nuclear processes, is required for DNA damage repair in vitro and long-term engraftment of hematopoietic stem cells in vivo. Therefore, we investigated the role of DEK in normal hematopoiesis and response to DNA damaging agents in vivo. Here, we report that hematopoiesis is largely unperturbed in DEK knockout mice compared with wild-type (WT) controls. However, DEK knockout mice have fewer radioprotective units, but increased capacity to survive repeated sublethal doses of radiation exposure compared with WT mice. Furthermore, this increased survival correlated with a sustained quiescent state in which DEK knockout restricted hematopoietic progenitor cells (HPC-1) were nearly three times more likely to be quiescent following irradiation compared with WT cells and were significantly more radioresistant during the early phases of myeloid reconstitution. Together, our studies indicate that DEK functions in the normal hematopoietic stress response to recurrent radiation exposure.
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Affiliation(s)
- Juana Serrano-Lopez
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Kalpana Nattamai
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Nicholas A Pease
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Miranda S Shephard
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Ashley M Wellendorf
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Mathieu Sertorio
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Eric A Smith
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Hartmut Geiger
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Susanne I Wells
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Jose A Cancelas
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Lisa M Privette Vinnedge
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio.
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20
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Abstract
PURPOSE OF REVIEW Hematopoietic stem/progenitor cell fate decision during hematopoiesis is regulated by intracellular and extracellular signals such as transcription factors, growth factors, and cell-to-cell interactions. In this review, we explore the function of DEK, a nuclear phosphoprotein, on gene regulation. We also examine how DEK is secreted and internalized by cells, and discuss how both endogenous and extracellular DEK regulates hematopoiesis. Finally, we explore what currently is known about the regulation of DEK during inflammation. RECENT FINDINGS DEK negatively regulates the proliferation of early myeloid progenitor cells but has a positive effect on the differentiation of mature myeloid cells. Inflammation regulates intracellular DEK concentrations with inflammatory stimuli enhancing DEK expression. Inflammation-induced nuclear factor-kappa B activation is regulated by DEK, resulting in changes in the production of other inflammatory molecules such as IL-8. Inflammatory stimuli in turn regulates DEK secretion by cells of hematopoietic origin. However, how inflammation-induced expression and secretion of DEK regulates hematopoiesis remains unknown. SUMMARY Understanding how DEK regulates hematopoiesis under both homeostatic and inflammatory conditions may lead to a better understanding of the biology of HSCs and HPCs. Furthering our knowledge of the regulation of hematopoiesis will ultimately lead to new therapeutics that may increase the efficacy of hematopoietic stem cell transplantation.
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Affiliation(s)
- Maegan L Capitano
- Indiana University School of Medicine, Department of Microbiology and Immunology, Indianapolis, Indiana, USA
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21
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Smith EA, Gole B, Willis NA, Soria R, Starnes LM, Krumpelbeck EF, Jegga AG, Ali AM, Guo H, Meetei AR, Andreassen PR, Kappes F, Vinnedge LMP, Daniel JA, Scully R, Wiesmüller L, Wells SI. DEK is required for homologous recombination repair of DNA breaks. Sci Rep 2017; 7:44662. [PMID: 28317934 PMCID: PMC5357905 DOI: 10.1038/srep44662] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 02/13/2017] [Indexed: 12/16/2022] Open
Abstract
DEK is a highly conserved chromatin-bound protein whose upregulation across cancer types correlates with genotoxic therapy resistance. Loss of DEK induces genome instability and sensitizes cells to DNA double strand breaks (DSBs), suggesting defects in DNA repair. While these DEK-deficiency phenotypes were thought to arise from a moderate attenuation of non-homologous end joining (NHEJ) repair, the role of DEK in DNA repair remains incompletely understood. We present new evidence demonstrating the observed decrease in NHEJ is insufficient to impact immunoglobulin class switching in DEK knockout mice. Furthermore, DEK knockout cells were sensitive to apoptosis with NHEJ inhibition. Thus, we hypothesized DEK plays additional roles in homologous recombination (HR). Using episomal and integrated reporters, we demonstrate that HR repair of conventional DSBs is severely compromised in DEK-deficient cells. To define responsible mechanisms, we tested the role of DEK in the HR repair cascade. DEK-deficient cells were impaired for γH2AX phosphorylation and attenuated for RAD51 filament formation. Additionally, DEK formed a complex with RAD51, but not BRCA1, suggesting a potential role regarding RAD51 filament formation, stability, or function. These findings define DEK as an important and multifunctional mediator of HR, and establish a synthetic lethal relationship between DEK loss and NHEJ inhibition.
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Affiliation(s)
- Eric A. Smith
- Division of Oncology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Boris Gole
- Department of Obstetrics and Gynecology; Ulm University, Ulm, 89075, Germany
| | - Nicholas A. Willis
- Department of Medicine, Division of Hematology-Oncology and Cancer Research Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, 02215, USA
| | - Rebeca Soria
- Chromatin Structure and Function Group, The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, 2200, Denmark
| | - Linda M. Starnes
- Chromatin Structure and Function Group, The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, 2200, Denmark
| | - Eric F. Krumpelbeck
- Division of Oncology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Anil G. Jegga
- Division of Oncology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Abdullah M. Ali
- Division of Experimental Hematology and Cancer Biology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Haihong Guo
- Institute of Biochemistry and Molecular Biology; Medical School, RWTH Aachen University, Aachen, 52074, Germany
| | - Amom R. Meetei
- Division of Experimental Hematology and Cancer Biology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Paul R. Andreassen
- Division of Experimental Hematology and Cancer Biology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Ferdinand Kappes
- Institute of Biochemistry and Molecular Biology; Medical School, RWTH Aachen University, Aachen, 52074, Germany
| | | | - Jeremy A. Daniel
- Chromatin Structure and Function Group, The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, 2200, Denmark
| | - Ralph Scully
- Department of Medicine, Division of Hematology-Oncology and Cancer Research Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, 02215, USA
| | - Lisa Wiesmüller
- Department of Obstetrics and Gynecology; Ulm University, Ulm, 89075, Germany
| | - Susanne I. Wells
- Division of Oncology; Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, 45229, USA
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22
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Qiao MX, Li C, Zhang AQ, Hou LL, Yang J, Hu HG. Regulation of DEK expression by AP-2α and methylation level of DEK promoter in hepatocellular carcinoma. Oncol Rep 2016; 36:2382-90. [PMID: 27499261 DOI: 10.3892/or.2016.4984] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 06/23/2016] [Indexed: 11/06/2022] Open
Abstract
DEK is overexpressed in multiple invasive tumors. However, the transcriptional regulatory mechanism of DEK remains unclear. In the present study, progressive-type truncation assay indicated that CpG2-2 (-167 bp/+35 bp) was the DEK core promoter, whose methylation inhibited DEK expression. Bisulfite genomic sequencing analysis indicated that the methylation levels of the DEK promoter in normal hepatic cells and tissues were higher than those in hepatocellular carcinoma (HCC) cells. TFSEARCH result revealed transcription factor binding sites in CpG2-2. Among the sites, the AP-2α binding site showed the most significant methylation difference; hence, AP-2α is a key transcription factor that regulates DEK expression. Point or deletion mutation of the AP-2α binding site significantly reduced the promoter activity. Chromatin immunoprecipitation assay demonstrated the binding of AP-2α to the core promoter. Furthermore, knock down of endogenous AP-2α downregulated DEK expression, whereas overexpression of AP-2α upregulated DEK expression. Thus, AP-2α is an important transcription factor of DEK expression, which is correlated with the methylation level of the DEK core promoter in HCC.
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Affiliation(s)
- Ming-Xu Qiao
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
| | - Chun Li
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
| | - Ai-Qun Zhang
- Institute of Hepatobiliary Surgery, PLA General Hospital, Beijing 100853, P.R. China
| | - Ling-Ling Hou
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
| | - Juan Yang
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
| | - Hong-Gang Hu
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P.R. China
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23
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Gentry M, Hennig L. A Structural Bisulfite Assay to Identify DNA Cruciforms. MOLECULAR PLANT 2016; 9:1328-1336. [PMID: 27375204 DOI: 10.1016/j.molp.2016.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 06/10/2016] [Accepted: 06/12/2016] [Indexed: 06/06/2023]
Abstract
In the half century since the discovery of the double-helix structure of DNA, it has become increasingly clear that DNA functionality is based on much more than its sequence in a double-helical structure. Further advances have highlighted the importance of additional aspects of DNA structure: its packaging in the higher order chromatin structure, positioning of nucleosomes along the DNA, and the occurrence of non-helical DNA structures. Of these, the latter has been problematic to prove empirically. Here, we describe a method that uses non-denaturing bisulfite sequencing on isolated Arabidopsis thaliana nuclei to determine the location of cytosines positioned outside the double helix as a result of non-B-form DNA structures. We couple this with computational methods and S1 nuclease digest to reliably identify stable, non-B-form, cruciform structures. This enables us to identify a palindrome in the promoter of FLOWERING LOCUS T that forms a stable non-B-form structure. The stronger conservation of the ability to form a non-helical secondary structure than of the sequence suggests that this structure is biologically relevant.
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Affiliation(s)
- Matthew Gentry
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, 75007 Uppsala, Sweden
| | - Lars Hennig
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, 75007 Uppsala, Sweden.
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24
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Zhang Y, Liu J, Wang S, Luo X, Li Y, Lv Z, Zhu J, Lin J, Ding L, Ye Q. The DEK oncogene activates VEGF expression and promotes tumor angiogenesis and growth in HIF-1α-dependent and -independent manners. Oncotarget 2016; 7:23740-56. [PMID: 26988756 PMCID: PMC5029660 DOI: 10.18632/oncotarget.8060] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 02/29/2016] [Indexed: 11/25/2022] Open
Abstract
The DEK oncogene is overexpressed in various cancers and overexpression of DEK correlates with poor clinical outcome. Vascular endothelial growth factor (VEGF) is the most important regulator of tumor angiogenesis, a process essential for tumor growth and metastasis. However, whether DEK enhances tumor angiogenesis remains unclear. Here, we show that DEK is a key regulator of VEGF expression and tumor angiogenesis. Using chromatin immunoprecipitation assay, we found that DEK promoted VEGF transcription in breast cancer cells (MCF7, ZR75-1 and MDA-MB-231) by directly binding to putative DEK-responsive element (DRE) of the VEGF promoter and indirectly binding to hypoxia response element (HRE) upstream of the DRE through its interaction with the transcription factor hypoxia-inducible factor 1α (HIF-1α), a master regulator of tumor angiogenesis and growth. DEK is responsible for recruitment of HIF-1α and the histone acetyltransferase p300 to the VEGF promoter. DEK-enhanced VEGF increases vascular endothelial cell proliferation, migration and tube formation as well as angiogenesis in the chick chorioallantoic membrane. DEK promotes tumor angiogenesis and growth in nude mice in HIF-1α-dependent and -independent manners. Immunohistochemical staining showed that DEK expression positively correlates with the expression of VEGF and microvessel number in 58 breast cancer patients. Our data establish DEK as a sequence-specific binding transcription factor, a novel coactivator for HIF-1α in regulation of VEGF transcription and a novel promoter of angiogenesis.
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MESH Headings
- Animals
- Apoptosis
- Biomarkers, Tumor
- Breast Neoplasms/blood supply
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Cell Proliferation
- Chick Embryo
- Chorioallantoic Membrane/metabolism
- Chromosomal Proteins, Non-Histone/genetics
- Chromosomal Proteins, Non-Histone/metabolism
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Mice
- Mice, Nude
- Neovascularization, Pathologic/metabolism
- Neovascularization, Pathologic/pathology
- Oncogene Proteins/genetics
- Oncogene Proteins/metabolism
- Poly-ADP-Ribose Binding Proteins/genetics
- Poly-ADP-Ribose Binding Proteins/metabolism
- Response Elements
- Signal Transduction
- Tumor Cells, Cultured
- Vascular Endothelial Growth Factor A/genetics
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Yanan Zhang
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, People's Republic of China
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Liaoning, People's Republic of China
| | - Jie Liu
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, People's Republic of China
| | - Shibin Wang
- First Affiliated Hospital, Chinese PLA General Hospital, Beijing, People's Republic of China
| | - Xiaoli Luo
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, People's Republic of China
| | - Yang Li
- First Affiliated Hospital, Chinese PLA General Hospital, Beijing, People's Republic of China
| | - Zhaohui Lv
- Department of Endocrinology, Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, People's Republic of China
| | - Jie Zhu
- Department of Endocrinology, Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, People's Republic of China
| | - Jing Lin
- First Affiliated Hospital, Chinese PLA General Hospital, Beijing, People's Republic of China
| | - Lihua Ding
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, People's Republic of China
| | - Qinong Ye
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, People's Republic of China
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Liaoning, People's Republic of China
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25
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Lohmann F, Dangeti M, Soni S, Chen X, Planutis A, Baron MH, Choi K, Bieker JJ. The DEK Oncoprotein Is a Critical Component of the EKLF/KLF1 Enhancer in Erythroid Cells. Mol Cell Biol 2015; 35:3726-38. [PMID: 26303528 PMCID: PMC4589598 DOI: 10.1128/mcb.00382-15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 05/06/2015] [Accepted: 08/17/2015] [Indexed: 02/07/2023] Open
Abstract
Understanding how transcriptional regulators are themselves controlled is important in attaining a complete picture of the intracellular effects that follow signaling cascades during early development and cell-restricted differentiation. We have addressed this issue by focusing on the regulation of EKLF/KLF1, a zinc finger transcription factor that plays a necessary role in the global regulation of erythroid gene expression. Using biochemical affinity purification, we have identified the DEK oncoprotein as a critical factor that interacts with an essential upstream enhancer element of the EKLF promoter and exerts a positive effect on EKLF levels. This element also binds a core set of erythroid transcription factors, suggesting that DEK is part of a tissue-restricted enhanceosome that contains BMP4-dependent and -independent components. Together with local enrichment of properly coded histones and an open chromatin domain, optimal transcriptional activation of the EKLF locus can be established.
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Affiliation(s)
- Felix Lohmann
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA
| | - Mohan Dangeti
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA
| | - Shefali Soni
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA
| | - Xiaoyong Chen
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA
| | - Antanas Planutis
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA
| | - Margaret H Baron
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA Black Family Stem Cell Institute, Mount Sinai School of Medicine, New York, New York, USA Tisch Cancer Institute, Mount Sinai School of Medicine, New York, New York, USA Department of Medicine, Mount Sinai School of Medicine, New York, New York, USA
| | - Kyunghee Choi
- Department of Pathology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - James J Bieker
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, New York, USA Black Family Stem Cell Institute, Mount Sinai School of Medicine, New York, New York, USA Tisch Cancer Institute, Mount Sinai School of Medicine, New York, New York, USA
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26
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Dissecting the Potential Interplay of DEK Functions in Inflammation and Cancer. JOURNAL OF ONCOLOGY 2015; 2015:106517. [PMID: 26425120 PMCID: PMC4575739 DOI: 10.1155/2015/106517] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Accepted: 03/05/2015] [Indexed: 12/12/2022]
Abstract
There is a long-standing correlation between inflammation, inflammatory cell signaling pathways, and tumor formation. Understanding the mechanisms behind inflammation-driven tumorigenesis is of great research and clinical importance. Although not entirely understood, these mechanisms include a complex interaction between the immune system and the damaged epithelium that is mediated by an array of molecular signals of inflammation—including reactive oxygen species (ROS), cytokines, and NFκB signaling—that are also oncogenic. Here, we discuss the association of the unique DEK protein with these processes. Specifically, we address the role of DEK in chronic inflammation via viral infections and autoimmune diseases, the overexpression and oncogenic activity of DEK in cancers, and DEK-mediated regulation of NFκB signaling. Combined, evidence suggests that DEK may play a complex, multidimensional role in chronic inflammation and subsequent tumorigenesis.
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27
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Deutzmann A, Ganz M, Schönenberger F, Vervoorts J, Kappes F, Ferrando-May E. The human oncoprotein and chromatin architectural factor DEK counteracts DNA replication stress. Oncogene 2015; 34:4270-7. [PMID: 25347734 DOI: 10.1038/onc.2014.346] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 09/03/2014] [Accepted: 09/04/2014] [Indexed: 12/16/2022]
Abstract
DNA replication stress is a major source of DNA strand breaks and genomic instability, and a hallmark of precancerous lesions. In these hyperproliferative tissues, activation of the DNA damage response results in apoptosis or senescence preventing or delaying their development to full malignancy. In cells, in which this antitumor barrier is disabled by mutations (for example, in p53), viability and further uncontrolled proliferation depend on factors that help to cope with replication-associated DNA damage. Replication problems preferentially arise in chromatin regions harboring complex DNA structures. DEK is a unique chromatin architectural factor which binds to non-B-form DNA structures, such as cruciform DNA or four-way junctions. It regulates DNA topology and chromatin organization, and is essential for the maintenance of heterochromatin integrity. Since its isolation as part of an oncogenic fusion in a subtype of AML, DEK has been consistently associated with tumor progression and chemoresistance. How DEK promotes cancer, however, is poorly understood. Here we show that DEK facilitates cellular proliferation under conditions of DNA replication stress by promoting replication fork progression. DEK also protects from the transmission of DNA damage to the daughter cell generation. We propose that DEK counteracts replication stress and ensures proliferative advantage by resolving problematic DNA and/or chromatin structures at the replication fork.
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Affiliation(s)
- A Deutzmann
- Bioimaging Center, Department of Biology, University of Konstanz, Konstanz, Germany
| | - M Ganz
- Bioimaging Center, Department of Biology, University of Konstanz, Konstanz, Germany
| | - F Schönenberger
- Bioimaging Center, Department of Biology, University of Konstanz, Konstanz, Germany
| | - J Vervoorts
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Aachen, Germany
| | - F Kappes
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Aachen, Germany
| | - E Ferrando-May
- Bioimaging Center, Department of Biology, University of Konstanz, Konstanz, Germany
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28
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Sandén C, Gullberg U. The DEK oncoprotein and its emerging roles in gene regulation. Leukemia 2015; 29:1632-6. [PMID: 25765544 DOI: 10.1038/leu.2015.72] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/08/2015] [Accepted: 03/03/2015] [Indexed: 02/06/2023]
Abstract
The DEK oncogene is highly expressed in cells from most human tissues and overexpressed in a large and growing number of cancers. It also fuses with the NUP214 gene to form the DEK-NUP214 fusion gene in a subset of acute myeloid leukemia. Originally characterized as a member of this translocation, DEK has since been implicated in epigenetic and transcriptional regulation, but its role in these processes is still elusive and intriguingly complex. Similarly multifaceted is its contribution to cellular transformation, affecting multiple cellular processes such as self-renewal, proliferation, differentiation, senescence and apoptosis. Recently, the roles of the DEK and DEK-NUP214 proteins have been elucidated by global analysis of DNA binding and gene expression, as well as multiple functional studies. This review outlines recent advances in the understanding of the basic functions of the DEK protein and its role in leukemogenesis.
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Affiliation(s)
- C Sandén
- Department of Hematology, Lund University, Lund, Sweden
| | - U Gullberg
- Department of Hematology, Lund University, Lund, Sweden
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29
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Identification and characterization of nonhistone chromatin proteins: human positive coactivator 4 as a candidate. Methods Mol Biol 2015; 1288:245-72. [PMID: 25827884 DOI: 10.1007/978-1-4939-2474-5_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
The highly dynamic nucleoprotein structure of eukaryotic genome is organized in an ordered fashion, the unit of which is the nucleosome. The nucleosome is composed of core histones and DNA of variable size wrapped around it. Apart from the histone proteins, several nonhistone proteins also interact with the complex consisting of the DNA, the core and linker histones conferring highly regulated fluidity on the chromatin and permitting fine tuning of its functions. The nonhistone proteins are multifunctional and accentuate diverse cellular outcomes. In spite of the technical challenges, the architectural role of the nonhistone proteins altering the topology of the chromatin has been studied extensively. To appreciate the significance of the chromatin for genome function, it is essential to examine the role of the nonhistone proteins in different physiological conditions. Here, taking the example of a highly abundant chromatin protein, PC4 (Positive coactivator 4), we describe strategies for the identification of the chromatin-associated proteins and their structural and functional characterization.
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30
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Martinez-Useros J, Rodriguez-Remirez M, Borrero-Palacios A, Moreno I, Cebrian A, Gomez del Pulgar T, del Puerto-Nevado L, Vega-Bravo R, Puime-Otin A, Perez N, Zazo S, Senin C, Fernandez-Aceñero MJ, Soengas MS, Rojo F, Garcia-Foncillas J. DEK is a potential marker for aggressive phenotype and irinotecan-based therapy response in metastatic colorectal cancer. BMC Cancer 2014; 14:965. [PMID: 25515240 PMCID: PMC4300837 DOI: 10.1186/1471-2407-14-965] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 12/11/2014] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND DEK is a transcription factor involved in stabilization of heterochromatin and cruciform structures. It plays an important role in development and progression of different types of cancer. This study aims to analyze the role of DEK in metastatic colorectal cancer. METHODS Baseline DEK expression was firstly quantified in 9 colorectal cell lines and normal mucosa by WB. SiRNA-mediated DEK inhibition was carried out for transient DEK silencing in DLD1 and SW620 to dissect its role in colorectal cancer aggressiveness. Irinotecan response assays were performed with SN38 over 24 hours and apoptosis was quantified by flow cytometry. Ex-vivo assay was carried out with 3 fresh tumour tissues taken from surgical resection and treated with SN38 for 24 hours. DEK expression was determined by immunohistochemistry in 67 formalin-fixed paraffin-embedded tumour samples from metastatic colorectal cancer patients treated with irinotecan-based therapy as first-line treatment. RESULTS The DEK oncogene is overexpressed in all colorectal cancer cell lines. Knock-down of DEK on DLD1 and SW620 cell lines decreased cell migration and increased irinotecan-induced apoptosis. In addition, low DEK expression level predicted irinotecan-based chemotherapy response in metastatic colorectal cancer patients with KRAS wild-type. CONCLUSIONS These data suggest DEK overexpression as a crucial event for the emergence of an aggressive phenotype in colorectal cancer and its potential role as biomarker for irinotecan response in those patients with KRAS wild-type status.
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Affiliation(s)
- Javier Martinez-Useros
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Maria Rodriguez-Remirez
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Aurea Borrero-Palacios
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Irene Moreno
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Arancha Cebrian
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Teresa Gomez del Pulgar
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Laura del Puerto-Nevado
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
| | - Ricardo Vega-Bravo
- />Department of Pathology, University Hospital “Fundación Jiménez Díaz”-UAM, Madrid, Spain
| | - Alberto Puime-Otin
- />Department of Pathology, University Hospital “Fundación Jiménez Díaz”-UAM, Madrid, Spain
| | - Nuria Perez
- />Department of Pathology, University Hospital “Fundación Jiménez Díaz”-UAM, Madrid, Spain
| | - Sandra Zazo
- />Department of Pathology, University Hospital “Fundación Jiménez Díaz”-UAM, Madrid, Spain
| | - Clara Senin
- />Department of Oncology, Vigo Hospital, Vigo, Spain
| | | | - Maria S Soengas
- />Melanoma Research Group, Spanish National Cancer Research Centre, Madrid, Spain
| | - Federico Rojo
- />Department of Pathology, University Hospital “Fundación Jiménez Díaz”-UAM, Madrid, Spain
| | - Jesus Garcia-Foncillas
- />Translational Oncology Division, OncoHealth Institute, Health Research Institute - University Hospital “Fundación Jiménez Díaz”-UAM, Av. Reyes Católicos 2, 28040 Madrid, Spain
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31
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Waidmann S, Kusenda B, Mayerhofer J, Mechtler K, Jonak C. A DEK domain-containing protein modulates chromatin structure and function in Arabidopsis. THE PLANT CELL 2014; 26:4328-44. [PMID: 25387881 PMCID: PMC4277211 DOI: 10.1105/tpc.114.129254] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 10/01/2014] [Accepted: 10/22/2014] [Indexed: 05/19/2023]
Abstract
Chromatin is a major determinant in the regulation of virtually all DNA-dependent processes. Chromatin architectural proteins interact with nucleosomes to modulate chromatin accessibility and higher-order chromatin structure. The evolutionarily conserved DEK domain-containing protein is implicated in important chromatin-related processes in animals, but little is known about its DNA targets and protein interaction partners. In plants, the role of DEK has remained elusive. In this work, we identified DEK3 as a chromatin-associated protein in Arabidopsis thaliana. DEK3 specifically binds histones H3 and H4. Purification of other proteins associated with nuclear DEK3 also established DNA topoisomerase 1α and proteins of the cohesion complex as in vivo interaction partners. Genome-wide mapping of DEK3 binding sites by chromatin immunoprecipitation followed by deep sequencing revealed enrichment of DEK3 at protein-coding genes throughout the genome. Using DEK3 knockout and overexpressor lines, we show that DEK3 affects nucleosome occupancy and chromatin accessibility and modulates the expression of DEK3 target genes. Furthermore, functional levels of DEK3 are crucial for stress tolerance. Overall, data indicate that DEK3 contributes to modulation of Arabidopsis chromatin structure and function.
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Affiliation(s)
- Sascha Waidmann
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter, 1030 Vienna, Austria
| | - Branislav Kusenda
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter, 1030 Vienna, Austria
| | - Juliane Mayerhofer
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter, 1030 Vienna, Austria
| | - Karl Mechtler
- Research Institute of Molecular Pathology, Vienna Biocenter, 1030 Vienna, Austria
| | - Claudia Jonak
- Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, Vienna Biocenter, 1030 Vienna, Austria
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32
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Ivanauskiene K, Delbarre E, McGhie JD, Küntziger T, Wong LH, Collas P. The PML-associated protein DEK regulates the balance of H3.3 loading on chromatin and is important for telomere integrity. Genome Res 2014; 24:1584-94. [PMID: 25049225 PMCID: PMC4199371 DOI: 10.1101/gr.173831.114] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 07/18/2014] [Indexed: 12/24/2022]
Abstract
Histone variant H3.3 is deposited in chromatin at active sites, telomeres, and pericentric heterochromatin by distinct chaperones, but the mechanisms of regulation and coordination of chaperone-mediated H3.3 loading remain largely unknown. We show here that the chromatin-associated oncoprotein DEK regulates differential HIRA- and DAAX/ATRX-dependent distribution of H3.3 on chromosomes in somatic cells and embryonic stem cells. Live cell imaging studies show that nonnucleosomal H3.3 normally destined to PML nuclear bodies is re-routed to chromatin after depletion of DEK. This results in HIRA-dependent widespread chromatin deposition of H3.3 and H3.3 incorporation in the foci of heterochromatin in a process requiring the DAXX/ATRX complex. In embryonic stem cells, loss of DEK leads to displacement of PML bodies and ATRX from telomeres, redistribution of H3.3 from telomeres to chromosome arms and pericentric heterochromatin, induction of a fragile telomere phenotype, and telomere dysfunction. Our results indicate that DEK is required for proper loading of ATRX and H3.3 on telomeres and for telomeric chromatin architecture. We propose that DEK acts as a "gatekeeper" of chromatin, controlling chromatin integrity by restricting broad access to H3.3 by dedicated chaperones. Our results also suggest that telomere stability relies on mechanisms ensuring proper histone supply and routing.
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Affiliation(s)
- Kristina Ivanauskiene
- Stem Cell Epigenetics Laboratory, Institute of Basic Medical Sciences, Faculty of Medicine, and Norwegian Center for Stem Cell Research, University of Oslo, 0317 Oslo, Norway
| | - Erwan Delbarre
- Stem Cell Epigenetics Laboratory, Institute of Basic Medical Sciences, Faculty of Medicine, and Norwegian Center for Stem Cell Research, University of Oslo, 0317 Oslo, Norway
| | - James D McGhie
- Epigenetics and Chromatin (EpiC) Research, Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
| | - Thomas Küntziger
- Stem Cell Epigenetics Laboratory, Institute of Basic Medical Sciences, Faculty of Medicine, and Norwegian Center for Stem Cell Research, University of Oslo, 0317 Oslo, Norway
| | - Lee H Wong
- Epigenetics and Chromatin (EpiC) Research, Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
| | - Philippe Collas
- Stem Cell Epigenetics Laboratory, Institute of Basic Medical Sciences, Faculty of Medicine, and Norwegian Center for Stem Cell Research, University of Oslo, 0317 Oslo, Norway;
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33
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Sandén C, Järvstråt L, Lennartsson A, Brattås PL, Nilsson B, Gullberg U. The DEK oncoprotein binds to highly and ubiquitously expressed genes with a dual role in their transcriptional regulation. Mol Cancer 2014; 13:215. [PMID: 25216995 PMCID: PMC4175287 DOI: 10.1186/1476-4598-13-215] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 09/09/2014] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The DEK gene is highly expressed in a wide range of cancer cells, and a recurrent translocation partner in acute myeloid leukemia. While DEK has been identified as one of the most abundant proteins in human chromatin, its function and binding properties are not fully understood. METHODS We performed ChIP-seq analysis in the myeloid cell line U937 and coupled it with epigenetic and gene expression analysis to explore the genome-wide binding pattern of DEK and its role in gene regulation. RESULTS We show that DEK preferentially binds to open chromatin, with a low degree of DNA methylation and scarce in the heterochromatin marker H3K9me(3) but rich in the euchromatin marks H3K4me(2/3), H3K27ac and H3K9ac. More specifically, DEK binding is predominantly located at the transcription start sites of highly transcribed genes and a comparative analysis with previously established transcription factor binding patterns shows a similarity with that of RNA polymerase II. Further bioinformatic analysis demonstrates that DEK mainly binds to genes that are ubiquitously expressed across tissues. The functional significance of DEK binding was demonstrated by knockdown of DEK by shRNA, resulting in both significant upregulation and downregulation of DEK-bound genes. CONCLUSIONS We find that DEK binds to transcription start sites with a dual role in activation and repression of highly and ubiquitously expressed genes.
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Affiliation(s)
- Carl Sandén
- />Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Linnea Järvstråt
- />Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Andreas Lennartsson
- />Center for Biosciences, Department of Biosciences and Nutrition, Karolinska Institute, Novum, 141 83 Huddinge, Sweden
| | - Per Ludvik Brattås
- />Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Björn Nilsson
- />Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Urban Gullberg
- />Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
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Wang X, Lin L, Ren X, Lin Z, Li Z, Li C, Jin T. High expression of oncoprotein DEK predicts poor prognosis of small cell lung cancer. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2014; 7:5016-23. [PMID: 25197373 PMCID: PMC4152063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/02/2014] [Indexed: 06/03/2023]
Abstract
Oncoprotein DEK plays an important role in cancer tumorigenesis. To explore the clinical implication of DEK expression on prognostic evaluation in small cell lung cancer (SCLC), 130 cases of SCLC with strict follow-up were selected for immunohistochemical (IHC) staining of DEK protein. The correlation between DEK expression and clinicopathological features of SCLC was evaluated using the Chi-square and Fisher's exact tests, survival rates were calculated using the Kaplan-Meier method and univariate and multivariate analyses were performed using the Cox proportional hazards regression model. IHC analysis demonstrated that DEK protein staining was strongly positive and significantly higher (44.62%) in SCLC compared with either adjacent non-tumor or normal lung tissues (P < 0.001 for both). DEK expression correlated with large tumor size (P = 0.025) and late pathologic stage (P = 0.005). Moreover, it correlated with low disease-free (P = 0.004) and 5-year (P = 0.005) survival rates. In the late-stage group, disease-free and 5-year survival rates of patients with high level DEK expression were significantly lower than those with low level DEK expression (P = 0.006 and P = 0.001, respectively). Furthermore, Cox analysis revealed that DEK expression emerged as a significant independent hazard factor for the overall survival rate of patients with SCLC (HR: 1.594, 95% CI: 1.087-2.336, P = 0.017). In conclusion, DEK plays an important role in the progression of SCLC. DEK may potentially be used as an independent biomarker for the prognostic evaluation of SCLC.
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Affiliation(s)
- Xiaoyan Wang
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
- Department of Physiology, Basic Medical College, Changchun University of Chinese MedicineChangchun 130117, China
| | - Lijuan Lin
- Department of Medical Imaging, College of Medicine, Eastern Liaoning UniversityDandong 118002, China
| | - Xiangshan Ren
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
| | - Zhenhua Lin
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
| | - Zhuhu Li
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
| | - Chunyu Li
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
| | - Tiefeng Jin
- Department of Pathology & Cancer Research Center, Yanbian University Medical CollegeYanji 133002, China
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Karam M, Thenoz M, Capraro V, Robin JP, Pinatel C, Lancon A, Galia P, Sibon D, Thomas X, Ducastelle-Lepretre S, Nicolini F, El-Hamri M, Chelghoun Y, Wattel E, Mortreux F. Chromatin redistribution of the DEK oncoprotein represses hTERT transcription in leukemias. Neoplasia 2014; 16:21-30. [PMID: 24563617 PMCID: PMC3927101 DOI: 10.1593/neo.131658] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 12/16/2013] [Accepted: 12/19/2013] [Indexed: 12/30/2022]
Abstract
Although numerous factors have been found to modulate hTERT transcription, the mechanism of its repression in certain leukemias remains unknown. We show here that DEK represses hTERT transcription through its enrichment on the hTERT promoter in cells from chronic and acute myeloid leukemias, chronic lymphocytic leukemia, but not acute lymphocytic leukemias where hTERT is overexpressed. We isolated DEK from the hTERT promoter incubated with nuclear extracts derived from fresh acute myelogenous leukemia (AML) cells and from cells expressing Tax, an hTERT repressor encoded by the human T cell leukemia virus type 1. In addition to the recruitment of DEK, the displacement of two potent known hTERT transactivators from the hTERT promoter characterized both AML cells and Tax-expressing cells. Reporter and chromatin immunoprecipitation assays permitted to map the region that supports the repressive effect of DEK on hTERT transcription, which was proportionate to the level of DEK-promoter association but not with the level of DEK expression. Besides hTERT repression, this context of chromatin redistribution of DEK was found to govern about 40% of overall transcriptional modifications, including those of cancer-prone genes. In conclusion, DEK emerges as an hTERT repressor shared by various leukemia subtypes and seems involved in the deregulation of numerous genes associated with leukemogenesis.
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Affiliation(s)
- Maroun Karam
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Morgan Thenoz
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Valérie Capraro
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Jean-Philippe Robin
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Christiane Pinatel
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Agnès Lancon
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - Perrine Galia
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
| | - David Sibon
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
- Service d'Hématologie Adultes, Hôpital Necker-Enfants Malades, Paris, France
| | - Xavier Thomas
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Sophie Ducastelle-Lepretre
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Franck Nicolini
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Mohamed El-Hamri
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Youcef Chelghoun
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Eric Wattel
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
- Service d'Hématologie, Pavillon Marcel Bérard, Centre Hospitalier Lyon-Sud 165, Pierre Bénite Cedex, France
| | - Franck Mortreux
- Université de Lyon 1, Centre National pour la Recherche Scientifique UMR5239, Oncovirologie et Biothérapies, Centre Léon Bérard, Lyon Cedex, France
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Broxmeyer HE, Mor-Vaknin N, Kappes F, Legendre M, Saha AK, Ou X, O'Leary H, Capitano M, Cooper S, Markovitz DM. Concise review: role of DEK in stem/progenitor cell biology. Stem Cells 2013; 31:1447-53. [PMID: 23733396 PMCID: PMC3814160 DOI: 10.1002/stem.1443] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 05/06/2013] [Accepted: 05/08/2013] [Indexed: 12/19/2022]
Abstract
Understanding the factors that regulate hematopoiesis opens up the possibility of modifying these factors and their actions for clinical benefit. DEK, a non-histone nuclear phosphoprotein initially identified as a putative proto-oncogene, has recently been linked to regulate hematopoiesis. DEK has myelosuppressive activity in vitro on proliferation of human and mouse hematopoietic progenitor cells and enhancing activity on engraftment of long-term marrow repopulating mouse stem cells, has been linked in coordinate regulation with the transcription factor C/EBPα, for differentiation of myeloid cells, and apparently targets a long-term repopulating hematopoietic stem cell for leukemic transformation. This review covers the uniqueness of DEK, what is known about how it now functions as a nuclear protein and also as a secreted molecule that can act in paracrine fashion, and how it may be regulated in part by dipeptidylpeptidase 4, an enzyme known to truncate and modify a number of proteins involved in activities on hematopoietic cells. Examples are provided of possible future areas of investigation needed to better understand how DEK may be regulated and function as a regulator of hematopoiesis, information possibly translatable to other normal and diseased immature cell systems.
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Affiliation(s)
- Hal E Broxmeyer
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana.
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Privette Vinnedge LM, Kappes F, Nassar N, Wells SI. Stacking the DEK: from chromatin topology to cancer stem cells. Cell Cycle 2013; 12:51-66. [PMID: 23255114 PMCID: PMC3570517 DOI: 10.4161/cc.23121] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Stem cells are essential for development and tissue maintenance and display molecular markers and functions distinct from those of differentiated cell types in a given tissue. Malignant cells that exhibit stem cell-like activities have been detected in many types of cancers and have been implicated in cancer recurrence and drug resistance. Normal stem cells and cancer stem cells have striking commonalities, including shared cell surface markers and signal transduction pathways responsible for regulating quiescence vs. proliferation, self-renewal, pluripotency and differentiation. As the search continues for markers that distinguish between stem cells, progenitor cells and cancer stem cells, growing evidence suggests that a unique chromatin-associated protein called DEK may confer stem cell-like qualities. Here, we briefly describe current knowledge regarding stem and progenitor cells. We then focus on new findings that implicate DEK as a regulator of stem and progenitor cell qualities, potentially through its unusual functions in the regulation of local or global chromatin organization.
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Affiliation(s)
- Lisa M Privette Vinnedge
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
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38
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Wang DM, Liu L, Fan L, Zou ZJ, Zhang LN, Yang S, Li JY, Xu W. Expression level of DEK in chronic lymphocytic leukemia is regulated by fludarabine and Nutlin-3 depending on p53 status. Cancer Biol Ther 2012; 13:1522-8. [PMID: 23052131 PMCID: PMC3542244 DOI: 10.4161/cbt.22252] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Human oncogene DEK has been shown to be upregulated in a number of neoplasms. The purpose of this study was to investigate DEK expression level in chronic lymphocytic leukemia (CLL), analyze the correlation between DEK expression and CLL prognostic markers, and characterize the role of DEK in the response to either chemotherapeutic drugs or nongenotoxic activators of the p53 pathway. DEK mRNA was evaluated by real-time quantitative reverse transcriptase-polymerase chain reaction (qPCR), and primary CLL samples were treated in vitro with either fludarabine or Nutlin-3 to explore the interaction of p53 status and DEK mRNA expression. The median expression levels of DEK mRNA were 6.792 × 10 (-2) (1.438 × 10 (-2) -3.201 × 10 (-1) ) in 65 patients with CLL. A marked increase of DEK mRNA expression was observed in the CLL patients with unmutated immunoglobulin heavy chain variable (IGHV) gene (p = 0.025), CD38-positive (p = 0.047), del(17p13) (p = 0.006). Both fludarabine and Nutlin-3 significantly downregulated DEK in the primary CLL cells which were with normal function of p53, or without deletion or mutation of p53 (p = 0.042, p = 0.038; p = 0.021, p = 0.017; p = 0.037, p = 0.017). However, the downregulation of DEK was not observed in the primary CLL cells which were with dysfunction of p53, or with deletion or mutation of p53 (p = 0.834, p = 0.477; p = 0.111, p = 0.378; p = 0.263, p = 0.378). These data show that DEK might be applied for the assessment of prognosis in patients with CLL, and fludarabine and Nutlin-3 regulate DEK expression depended on p53 status.
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Affiliation(s)
| | | | - Lei Fan
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
| | - Zhi-Jian Zou
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
| | - Li-Na Zhang
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
| | - Shu Yang
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
| | - Jian-Yong Li
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
| | - Wei Xu
- Department of Hematology; The First Affiliated Hospital of Nanjing Medical University; Jiangsu Province Hospital; Nanjing, PR China
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Privette Vinnedge LM, Ho SM, Wikenheiser-Brokamp KA, Wells SI. The DEK oncogene is a target of steroid hormone receptor signaling in breast cancer. PLoS One 2012; 7:e46985. [PMID: 23071688 PMCID: PMC3468546 DOI: 10.1371/journal.pone.0046985] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 09/07/2012] [Indexed: 12/28/2022] Open
Abstract
Expression of estrogen and progesterone hormone receptors indicates a favorable prognosis due to the successful use of hormonal therapies such as tamoxifen and aromatase inhibitors. Unfortunately, 15-20% of patients will experience breast cancer recurrence despite continued use of tamoxifen. Drug resistance to hormonal therapies is of great clinical concern so it is imperative to identify novel molecular factors that contribute to tumorigenesis in hormone receptor positive cancers and/or mediate drug sensitivity. The hope is that targeted therapies, in combination with hormonal therapies, will improve survival and prevent recurrence. We have previously shown that the DEK oncogene, which is a chromatin remodeling protein, supports breast cancer cell proliferation, invasion and the maintenance of the breast cancer stem cell population. In this report, we demonstrate that DEK expression is associated with positive hormone receptor status in primary breast cancers and is up-regulated in vitro following exposure to the hormones estrogen, progesterone, and androgen. Chromatin immunoprecipitation experiments identify DEK as a novel estrogen receptor α (ERα) target gene whose expression promotes estrogen-induced proliferation. Finally, we report for the first time that DEK depletion enhances tamoxifen-induced cell death in ER+ breast cancer cell lines. Together, our data suggest that DEK promotes the pathogenesis of ER+ breast cancer and that the targeted inhibition of DEK may enhance the efficacy of conventional hormone therapies.
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Affiliation(s)
- Lisa M. Privette Vinnedge
- Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, United States of America
| | - Shuk-Mei Ho
- Department of Environmental Health, University of Cincinnati College of Medicine and Cincinnati Veteran Affairs Medical Center, Cincinnati, Ohio, United States of America
| | - Kathryn A. Wikenheiser-Brokamp
- Department of Pathology and Laboratory Medicine, Cincinnati Children’s Hospital Medical Center and University of Cincinnati College of Medicine, Cincinnati, Ohio, United States of America
| | - Susanne I. Wells
- Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, United States of America
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40
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Kavanaugh GM, Wise-Draper TM, Morreale RJ, Morrison MA, Gole B, Schwemberger S, Tichy ED, Lu L, Babcock GF, Wells JM, Drissi R, Bissler JJ, Stambrook PJ, Andreassen PR, Wiesmüller L, Wells SI. The human DEK oncogene regulates DNA damage response signaling and repair. Nucleic Acids Res 2011; 39:7465-76. [PMID: 21653549 PMCID: PMC3177200 DOI: 10.1093/nar/gkr454] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 05/16/2011] [Indexed: 12/04/2022] Open
Abstract
The human DEK gene is frequently overexpressed and sometimes amplified in human cancer. Consistent with oncogenic functions, Dek knockout mice are partially resistant to chemically induced papilloma formation. Additionally, DEK knockdown in vitro sensitizes cancer cells to DNA damaging agents and induces cell death via p53-dependent and -independent mechanisms. Here we report that DEK is important for DNA double-strand break repair. DEK depletion in human cancer cell lines and xenografts was sufficient to induce a DNA damage response as assessed by detection of γH2AX and FANCD2. Phosphorylation of H2AX was accompanied by contrasting activation and suppression, respectively, of the ATM and DNA-PK pathways. Similar DNA damage responses were observed in primary Dek knockout mouse embryonic fibroblasts (MEFs), along with increased levels of DNA damage and exaggerated induction of senescence in response to genotoxic stress. Importantly, Dek knockout MEFs exhibited distinct defects in non-homologous end joining (NHEJ) when compared to their wild-type counterparts. Taken together, the data demonstrate new molecular links between DEK and DNA damage response signaling pathways, and suggest that DEK contributes to DNA repair.
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Affiliation(s)
- Gina M. Kavanaugh
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Trisha M. Wise-Draper
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Richard J. Morreale
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Monique A. Morrison
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Boris Gole
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Sandy Schwemberger
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Elisia D. Tichy
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Lu Lu
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - George F. Babcock
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - James M. Wells
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Rachid Drissi
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - John J. Bissler
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Peter J. Stambrook
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Paul R. Andreassen
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Lisa Wiesmüller
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Susanne I. Wells
- Division of Hematology/Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA Division of Gynecological Oncology, Department of Gynecology and Obstetrics, Ulm University, D-89075 Ulm, Germany, Research, Shriners Hospitals for Children, Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Division of Nephrology and Hypertension, Cincinnati Children's Hospital Medical Center, Department of Surgery, University of Cincinnati College of Medicine, Division of Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
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41
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Brázda V, Laister RC, Jagelská EB, Arrowsmith C. Cruciform structures are a common DNA feature important for regulating biological processes. BMC Mol Biol 2011; 12:33. [PMID: 21816114 PMCID: PMC3176155 DOI: 10.1186/1471-2199-12-33] [Citation(s) in RCA: 174] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 08/05/2011] [Indexed: 04/10/2023] Open
Abstract
DNA cruciforms play an important role in the regulation of natural processes involving DNA. These structures are formed by inverted repeats, and their stability is enhanced by DNA supercoiling. Cruciform structures are fundamentally important for a wide range of biological processes, including replication, regulation of gene expression, nucleosome structure and recombination. They also have been implicated in the evolution and development of diseases including cancer, Werner's syndrome and others. Cruciform structures are targets for many architectural and regulatory proteins, such as histones H1 and H5, topoisomerase IIβ, HMG proteins, HU, p53, the proto-oncogene protein DEK and others. A number of DNA-binding proteins, such as the HMGB-box family members, Rad54, BRCA1 protein, as well as PARP-1 polymerase, possess weak sequence specific DNA binding yet bind preferentially to cruciform structures. Some of these proteins are, in fact, capable of inducing the formation of cruciform structures upon DNA binding. In this article, we review the protein families that are involved in interacting with and regulating cruciform structures, including (a) the junction-resolving enzymes, (b) DNA repair proteins and transcription factors, (c) proteins involved in replication and (d) chromatin-associated proteins. The prevalence of cruciform structures and their roles in protein interactions, epigenetic regulation and the maintenance of cell homeostasis are also discussed.
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Affiliation(s)
- Václav Brázda
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v,v,i,, Královopolská 135, Brno, 612 65, Czech Republic.
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42
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Privette Vinnedge LM, McClaine R, Wagh PK, Wikenheiser-Brokamp KA, Waltz SE, Wells SI. The human DEK oncogene stimulates β-catenin signaling, invasion and mammosphere formation in breast cancer. Oncogene 2011; 30:2741-52. [PMID: 21317931 PMCID: PMC3117026 DOI: 10.1038/onc.2011.2] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 01/03/2011] [Accepted: 01/03/2011] [Indexed: 12/16/2022]
Abstract
Breast cancer is a major cause of cancer-related deaths in American women; therefore, the identification of novel breast cancer-related molecules for the discovery of new markers and drug targets remains essential. The human DEK gene, which encodes a chromatin-binding protein and DNA topology regulator, is upregulated in many types of cancer. DEK has been implicated as an oncogene in breast cancer based on mRNA expression studies, but its functional significance in breast cancer growth and progression has not yet been tested directly. We demonstrate that DEK is highly expressed in breast cancer cells compared with normal tissue, and functionally important for cellular growth, invasion and mammosphere formation. DEK overexpression in non-tumorigenic MCF10A cells resulted in increased growth and motility, with a concomitant downregulation of E-cadherin. Conversely, DEK knockdown in MCF7 and MDA-MB-468 breast cancer cells resulted in decreased growth and motility with upregulation of E-cadherin. The use of DEK-proficient and -deficient breast cancer cells in orthotopic xenografts provided further in vivo evidence that DEK contributes to tumor growth. Activation of the β-catenin signaling pathway is important for normal and cancer stem cell character, growth and metastasis. We show that DEK expression stimulated, and DEK knockdown repressed β-catenin nuclear translocation and activity. Importantly, the expression of constitutively active β-catenin rescued breast cancer invasion defects of DEK knockdown cells. Together, our data indicate that DEK expression stimulates the growth, stem cell character and motility of breast cancer cells, and that DEK-dependent cellular invasion occurs at least in part via β-catenin activation.
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Affiliation(s)
- L M Privette Vinnedge
- Department of Hematology and Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
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43
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Boryskina OP, Tkachenko MY, Shestopalova AV. Protein-DNA complexes: specificity and DNA readout mechanisms. ACTA ACUST UNITED AC 2011. [DOI: 10.7124/bc.00007c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- O. P. Boryskina
- O. Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine
| | - M. Yu. Tkachenko
- O. Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine
| | - A. V. Shestopalova
- O. Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine
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44
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Fahrer J, Popp O, Malanga M, Beneke S, Markovitz DM, Ferrando-May E, Bürkle A, Kappes F. High-affinity interaction of poly(ADP-ribose) and the human DEK oncoprotein depends upon chain length. Biochemistry 2010; 49:7119-30. [PMID: 20669926 PMCID: PMC2929705 DOI: 10.1021/bi1004365] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Poly(ADP-ribose) polymerase-1 (PARP-1) is a molecular DNA damage sensor that catalyzes the synthesis of the complex biopolymer poly(ADP-ribose) (PAR) under consumption of NAD(+). PAR engages in fundamental cellular processes such as DNA metabolism and transcription and interacts noncovalently with specific binding proteins involved in DNA repair and regulation of chromatin structure. A factor implicated in DNA repair and chromatin organization is the DEK oncoprotein, an abundant and conserved constituent of metazoan chromatin, and the only member of its protein class. We have recently demonstrated that DEK, under stress conditions, is covalently modified with PAR by PARP-1, leading to a partial release of DEK into the cytoplasm. Additionally, we have also observed a noncovalent interaction between DEK and PAR, which we detail here. Using sequence alignment, we identify three functional PAR-binding sites in the DEK primary sequence and confirm their functionality in PAR binding studies. Furthermore, we show that the noncovalent binding to DEK is dependent on PAR chain length as revealed by an overlay blot technique and a PAR electrophoretic mobility shift assay. Intriguingly, DEK promotes the formation of a defined complex with a 54mer PAR (K(D) = 6 x 10(-8) M), whereas no specific interaction is detected with a short PAR chain (18mer). In stark contrast to covalent poly(ADP-ribosyl)ation of DEK, the noncovalent interaction does not affect the overall ability of DEK to bind to DNA. Instead the noncovalent interaction interferes with subsequent DNA-dependent multimerization activities of DEK, as seen in South-Western, electrophoretic mobility shift, topology, and aggregation assays. In particular, noncovalent attachment of PAR to DEK promotes the formation of DEK-DEK complexes by competing with DNA binding. This was seen by the reduced affinity of PAR-bound DEK for DNA templates in solution. Taken together, our findings deepen the molecular understanding of the DEK-PAR interplay and support the existence of a cellular "PAR code" represented by PAR chain length.
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Affiliation(s)
- Jörg Fahrer
- Institute of Pharmacology and Toxicology, University of Ulm Medical Center, Ulm, Germany
- Molecular Toxicology Group, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Oliver Popp
- Molecular Toxicology Group, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Maria Malanga
- Department of Structural and Functional Biology, University Federico II of Naples, Naples, Italy
| | - Sascha Beneke
- Molecular Toxicology Group, Department of Biology, University of Konstanz, Konstanz, Germany
| | - David M. Markovitz
- Department of Internal Medicine, Division of Infectious Diseases, University of Michigan Medical Center, Ann Arbor, Michigan, USA
- Cellular & Molecular Biology Program, University of Michigan Medical Center, Ann Arbor, Michigan, USA
- Program in Immunology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Elisa Ferrando-May
- Bioimaging Center, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Alexander Bürkle
- Molecular Toxicology Group, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Ferdinand Kappes
- Department of Internal Medicine, Division of Infectious Diseases, University of Michigan Medical Center, Ann Arbor, Michigan, USA
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45
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Abstract
Slight modifications of chromatin dynamics can translate into small- and large-scale changes in DNA replication and DNA repair. Similarly, promoter usage and accessibility are tightly dependent on chromatin architecture. Consequently, it is perhaps not surprising that factors controlling chromatin organization are frequently deregulated (directly or indirectly) in cancer cells. DEK is emerging as a novel class of DNA topology modulators that can be both targets and effectors of protumorigenic events. The locus containing DEK at chromosome 6p22.3 is amplified or reorganized in multiple cancer types. In addition, DEK can be subject to a variety of tumor-associated transcriptional and post-translational modifications. In turn, DEK can favor cell transformation, at least in part by inhibiting cell differentiation and premature senescence. More recently, DEK has also been linked to the resistance of malignant cells to apoptotic inducers. Interestingly, a fraction of DEK can also bind RNA and affect alternative splicing, further illustrating the pleiotropic roles that this protein may exert in cancer cells. Here we will summarize the current literature about the regulation and function(s) of DEK as a proto-oncogene. In addition, the translational relevance of DEK as a putative diagnostic marker and candidate for drug development will be discussed.
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Affiliation(s)
- Erica Riveiro-Falkenbach
- Centro Nacional de Investigaciones Oncológicas (Spanish National Cancer Research Centre), Madrid, Spain
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46
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Secchiero P, Voltan R, di Iasio MG, Melloni E, Tiribelli M, Zauli G. The oncogene DEK promotes leukemic cell survival and is downregulated by both Nutlin-3 and chlorambucil in B-chronic lymphocytic leukemic cells. Clin Cancer Res 2010; 16:1824-33. [PMID: 20215548 DOI: 10.1158/1078-0432.ccr-09-3031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE To characterize the role of the oncogene DEK in modulating the response to either Nutlin-3, a small-molecule inhibitor of the MDM2/p53 interaction, or chlorambucil in primary B-chronic lymphocytic leukemia (B-CLL) cells. EXPERIMENTAL DESIGN DEK mRNA and protein levels were evaluated in primary B-CLL samples (n = 21), p53(wild-type) SKW6.4, p53(mutated) BJAB lymphoblastoid cell lines, and normal CD19(+) B lymphocytes-treated Nutlin-3 or chlorambucil (10 micromol/L, each). Knocking down experiments with either p53 or DEK small interfering RNA (siRNA) were done to investigate the potential role of p53 in controlling the expression of DEK and the role of DEK in leukemic cell survival/apoptosis. RESULTS Both Nutlin-3 and chlorambucil downregulated DEK in primary B-CLL samples (n = 21) and SKW6.4 but not in BJAB cells. Knocking down p53 attenuated the effect of Nutlin-3 on DEK expression, whereas knocking down DEK significantly increased both spontaneous and Nutlin-3-induced apoptosis. Conversely, counteracting DEK downmodulation by using p53 small interfering RNA reduced Nutlin-3-mediated apoptosis. On the other hand, Nutlin-3 potently induced p53 accumulation, but it did not affect DEK levels in normal CD19(+) B lymphocytes. CONCLUSIONS These data show that the downregulation of DEK in response to either Nutlin-3 or chlorambucil represents an important molecular determinant in the cytotoxic response of leukemic cells, and suggest that strategies aimed to downregulate DEK might improve the therapeutic potential of these drugs.
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MESH Headings
- Aged
- Aged, 80 and over
- Antineoplastic Agents, Alkylating/pharmacology
- Apoptosis
- B-Lymphocytes/metabolism
- B-Lymphocytes/pathology
- Blotting, Western
- Cell Proliferation
- Cell Survival/drug effects
- Cells, Cultured
- Chlorambucil/pharmacology
- Chromosomal Proteins, Non-Histone/physiology
- Down-Regulation/drug effects
- Female
- Humans
- Imidazoles/pharmacology
- Immunoenzyme Techniques
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Male
- Middle Aged
- Mutation
- Oncogene Proteins/physiology
- Piperazines/pharmacology
- Poly-ADP-Ribose Binding Proteins
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Stereoisomerism
- Tumor Suppressor Protein p53/physiology
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Affiliation(s)
- Paola Secchiero
- Department of Morphology and Embryology, University of Ferrara, Ferrara, Italy
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47
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Hua Y, Hu H, Peng X. Progress in studies on the DEK protein and its involvement in cellular apoptosis. SCIENCE IN CHINA. SERIES C, LIFE SCIENCES 2009; 52:637-42. [PMID: 19641868 DOI: 10.1007/s11427-009-0088-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2009] [Accepted: 03/30/2009] [Indexed: 12/12/2022]
Abstract
DEK protein is an ubiquitous phosphorylated nuclear protein. Specific binding of DEK to DNA could change the topology of DNA and then affect the gene activity of the underlying DNA sequences. It is speculated that there might be some potential relationship between the stress reaction of cells and DEK proteins. The phosphorylation status of DEK protein is altered during death-receptor-mediated cell apoptosis. Both phosphorylation and poly(ADP-ribosyl)ation could promote the release of DEK from apoptotic nuclei to extracellular environment, and in this case DEK becomes a potential autoantigen of some autoimmune diseases. The available evidence powerfully suggests that DEK protein is closely relevant to apoptosis. The overexpression of DEK protein has dual function in cell apoptosis, in terms of inhibiting or triggering cell apoptosis.
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Affiliation(s)
- Ying Hua
- College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, 100044, China
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48
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Wise-Draper TM, Morreale RJ, Morris TA, Mintz-Cole RA, Hoskins EE, Balsitis SJ, Husseinzadeh N, Witte DP, Wikenheiser-Brokamp KA, Lambert PF, Wells SI. DEK proto-oncogene expression interferes with the normal epithelial differentiation program. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 174:71-81. [PMID: 19036808 PMCID: PMC2631320 DOI: 10.2353/ajpath.2009.080330] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/18/2008] [Indexed: 01/14/2023]
Abstract
Overexpression of the DEK gene is associated with multiple human cancers, but its specific roles as a putative oncogene are not well defined. DEK transcription was previously shown to be induced by the high-risk human papillomavirus (HPV) E7 oncogene via E2F and Rb pathways. Transient DEK overexpression was able to inhibit both senescence and apoptosis in cultured cells. In at least the latter case, this mechanism involved the destabilization of p53 and the decreased expression of p53 target genes. We show here that DEK overexpression disrupts the normal differentiation program in a manner that is independent of either p53 or cell death. DEK expression was distinctly repressed upon the differentiation of cultured primary human keratinocytes, and stable DEK overexpression caused epidermal thickening in an organotypic raft model system. The observed hyperplasia involved a delay in keratinocyte differentiation toward a more undifferentiated state, and expansion of the basal cell compartment was due to increased proliferation, but not apoptosis. These phenotypes were accompanied by elevated p63 expression in the absence of p53 destabilization. In further support of bona fide oncogenic DEK activities, we report here up-regulated DEK protein levels in both human papilloma virus-positive hyperplastic murine skin and a subset of human squamous cell carcinomas. We suggest that DEK up-regulation may contribute to carcinoma development at least in part through increased proliferation and retardation of differentiation.
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MESH Headings
- Animals
- Blotting, Western
- Carcinoma, Squamous Cell/genetics
- Carcinoma, Squamous Cell/pathology
- Carcinoma, Squamous Cell/virology
- Cell Differentiation/genetics
- Cell Proliferation
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Cells, Cultured
- Chromosomal Proteins, Non-Histone/biosynthesis
- Chromosomal Proteins, Non-Histone/genetics
- Chromosomal Proteins, Non-Histone/metabolism
- DNA-Binding Proteins/metabolism
- Epithelial Cells/cytology
- Epithelial Cells/pathology
- Epithelial Cells/virology
- Epithelium/metabolism
- Epithelium/pathology
- Fluorescent Antibody Technique
- Foreskin/cytology
- Gene Expression
- Humans
- Hyperplasia/genetics
- Hyperplasia/metabolism
- Hyperplasia/virology
- Keratinocytes/cytology
- Keratinocytes/pathology
- Keratinocytes/virology
- Male
- Membrane Proteins/metabolism
- Mice
- Mice, Transgenic
- Oncogene Proteins/biosynthesis
- Oncogene Proteins/genetics
- Oncogene Proteins/metabolism
- Papillomavirus E7 Proteins/genetics
- Poly-ADP-Ribose Binding Proteins
- Proto-Oncogene Mas
- Reverse Transcriptase Polymerase Chain Reaction
- Up-Regulation
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Affiliation(s)
- Trisha M Wise-Draper
- Division of Pediatric Hematology/Oncology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, USA
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49
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How can we change beliefs? A Bayesian perspective. HOMEOPATHY 2008; 97:214-9. [PMID: 19371571 DOI: 10.1016/j.homp.2008.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Revised: 09/01/2008] [Accepted: 09/11/2008] [Indexed: 11/21/2022]
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50
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Kappes F, Fahrer J, Khodadoust MS, Tabbert A, Strasser C, Mor-Vaknin N, Moreno-Villanueva M, Bürkle A, Markovitz DM, Ferrando-May E. DEK is a poly(ADP-ribose) acceptor in apoptosis and mediates resistance to genotoxic stress. Mol Cell Biol 2008; 28:3245-57. [PMID: 18332104 PMCID: PMC2423161 DOI: 10.1128/mcb.01921-07] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Revised: 01/08/2008] [Accepted: 03/04/2008] [Indexed: 12/28/2022] Open
Abstract
DEK is a nuclear phosphoprotein implicated in oncogenesis and autoimmunity and a major component of metazoan chromatin. The intracellular cues that control the binding of DEK to DNA and its pleiotropic functions in DNA- and RNA-dependent processes have remained mainly elusive so far. Our recent finding that the phosphorylation status of DEK is altered during death receptor-mediated apoptosis suggested a potential involvement of DEK in stress signaling. In this study, we show that in cells committed to die, a portion of the cellular DEK pool is extensively posttranslationally modified by phosphorylation and poly(ADP-ribosyl)ation. Through interference with DEK expression, we further show that DEK promotes the repair of DNA lesions and protects cells from genotoxic agents that typically trigger poly(ADP-ribose) polymerase activation. The posttranslational modification of DEK during apoptosis is accompanied by the removal of the protein from chromatin and its release into the extracellular space. Released modified DEK is recognized by autoantibodies present in the synovial fluids of patients affected by juvenile rheumatoid arthritis/juvenile idiopathic arthritis. These findings point to a crucial role of poly(ADP-ribosyl)ation in shaping DEK's autoantigenic properties and in its function as a promoter of cell survival.
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Affiliation(s)
- F Kappes
- University of Konstanz, Department of Biology, Box X911, D-78457 Konstanz, Germany
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