1
|
Mandal P, Eswara K, Yerkesh Z, Kharchenko V, Zandarashvili L, Szczepski K, Bensaddek D, Jaremko Ł, Black BE, Fischle W. Molecular basis of hUHRF1 allosteric activation for synergistic histone modification binding by PI5P. SCIENCE ADVANCES 2022; 8:eabl9461. [PMID: 36001657 PMCID: PMC9401617 DOI: 10.1126/sciadv.abl9461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
Chromatin marks are recognized by distinct binding modules, many of which are embedded in multidomain proteins. How the different functionalities of such complex chromatin modulators are regulated is often unclear. Here, we delineated the interplay of the H3 amino terminus- and K9me-binding activities of the multidomain hUHRF1 protein. We show that the phosphoinositide PI5P interacts simultaneously with two distant flexible linker regions connecting distinct domains of hUHRF1. The binding is dependent on both, the polar head group, and the acyl part of the phospholipid and induces a conformational rearrangement juxtaposing the H3 amino terminus and K9me3 recognition modules of the protein. In consequence, the two features of the H3 tail are bound in a multivalent, synergistic manner. Our work highlights a previously unidentified molecular function for PI5P outside of the context of lipid mono- or bilayers and establishes a molecular paradigm for the allosteric regulation of complex, multidomain chromatin modulators by small cellular molecules.
Collapse
Affiliation(s)
- Papita Mandal
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Karthik Eswara
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Zhadyra Yerkesh
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Vladlena Kharchenko
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Levani Zandarashvili
- Department of Biochemistry and Biophysics, Penn Center for Genome Integrity, Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kacper Szczepski
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Dalila Bensaddek
- Core Laboratories, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Łukasz Jaremko
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| | - Ben E. Black
- Department of Biochemistry and Biophysics, Penn Center for Genome Integrity, Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Wolfgang Fischle
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia
| |
Collapse
|
2
|
Meevassana J, Nacharoenkul P, Wititsuwannakul J, Kitkumthorn N, Hamill K, Angspatt A, Mutirangura A. B1 repetitive sequence methylation enhances wound healing of second‑degree burns in rats. Biomed Rep 2022; 16:20. [PMID: 35251607 PMCID: PMC8850962 DOI: 10.3892/br.2022.1503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 12/22/2021] [Indexed: 11/24/2022] Open
Abstract
The accumulation of DNA damage in burn wounds delays wound healing. DNA methylation by short interspersed nuclear element (SINE) small interfering (si)RNA prevents DNA damage and promotes cell proliferation. Therefore, SINE siRNA may be able to promote burn wound healing. Here, a SINE B1 siRNA was used to treat burn wounds in rats. Second-degree burn wounds were introduced on the backs of rats. The rats were then divided into three groups: a B1 siRNA-treated, saline-treated control, and saline + calcium phosphate-nanoparticle-treated control group (n=15/group). The wounds were imaged on days 0, 7, 14, 21 and 28 post-injury. The tissue sections were processed for methylation, histological and immunohistochemical examination, and scored based on the overall expression of histone H2AX phosphorylated on serine 139 (γH2AX) and 8-hydroxy-2'-deoxyguanosine (8-OHdG). Burn wound closure improved in the B1 siRNA-treated group compared with that in the control group, especially from days 14-28 post-injury (P<0.001). The overall pathological score and degree of B1 methylation in the B1 siRNA-treated group improved significantly at days 14-28 post-injury, with the maximum improvement observed on day 14 (P<0.01) compared with the NSS and Ca-P nanoparticle groups. Immunohistochemical staining revealed lower expression of γH2AX and 8-OHdG in the B1 siRNA-treated group than in the control groups at days 14-28 post-injury; the maximum improvement was observed on days 14 and 21. These data imply that administering SINE siRNA is a promising therapeutic option for managing second-degree burns.
Collapse
Affiliation(s)
- Jiraroch Meevassana
- Department of Anatomy, Center of Excellence in Molecular Genetics of Cancer and Human Disease, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Panupong Nacharoenkul
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Jade Wititsuwannakul
- Department of Medicine, Division of Dermatology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Nakarin Kitkumthorn
- Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand
| | - Kevin Hamill
- Institute of Life Course and Medical Sciences, Faculty of Health and Life Sciences, University of Liverpool, Liverpool L69 7ZX, United Kingdom
| | - Apichai Angspatt
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Apiwat Mutirangura
- Department of Anatomy, Center of Excellence in Molecular Genetics of Cancer and Human Disease, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| |
Collapse
|
3
|
Likhatcheva M, Gieling RG, Brown JAL, Demonacos C, Williams KJ. A Novel Mechanism of Ataxia Telangiectasia Mutated Mediated Regulation of Chromatin Remodeling in Hypoxic Conditions. Front Cell Dev Biol 2021; 9:720194. [PMID: 34621741 PMCID: PMC8491615 DOI: 10.3389/fcell.2021.720194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 08/31/2021] [Indexed: 12/27/2022] Open
Abstract
The effects of genotoxic stress can be mediated by activation of the Ataxia Telangiectasia Mutated (ATM) kinase, under both DNA damage-dependent (including ionizing radiation), and independent (including hypoxic stress) conditions. ATM activation is complex, and primarily mediated by the lysine acetyltransferase Tip60. Epigenetic changes can regulate this Tip60-dependent activation of ATM, requiring the interaction of Tip60 with tri-methylated histone 3 lysine 9 (H3K9me3). Under hypoxic stress, the role of Tip60 in DNA damage-independent ATM activation is unknown. However, epigenetic changes dependent on the methyltransferase Suv39H1, which generates H3K9me3, have been implicated. Our results demonstrate severe hypoxic stress (0.1% oxygen) caused ATM auto-phosphorylation and activation (pS1981), H3K9me3, and elevated both Suv39H1 and Tip60 protein levels in FTC133 and HCT116 cell lines. Exploring the mechanism of ATM activation under these hypoxic conditions, siRNA-mediated Suv39H1 depletion prevented H3K9me3 induction, and Tip60 inhibition (by TH1834) blocked ATM auto-phosphorylation. While MDM2 (Mouse double minute 2) can target Suv39H1 for degradation, it can be blocked by sirtuin-1 (Sirt1). Under severe hypoxia MDM2 protein levels were unchanged, and Sirt1 levels depleted. SiRNA-mediated depletion of MDM2 revealed MDM2 dependent regulation of Suv39H1 protein stability under these conditions. We describe a novel molecular circuit regulating the heterochromatic state (H3K9me3 positive) under severe hypoxic conditions, showing that severe hypoxia-induced ATM activation maintains H3K9me3 levels by downregulating MDM2 and preventing MDM2-mediated degradation of Suv39H1. This novel mechanism is a potential anti-cancer therapeutic opportunity, which if exploited could target the hypoxic tumor cells known to drive both tumor progression and treatment resistance.
Collapse
Affiliation(s)
- Maria Likhatcheva
- Division of Pharmacy and Optometry, Faculty of Biology Medicine and Health, School of Health Science, University of Manchester, Manchester, United Kingdom
| | - Roben G Gieling
- Division of Pharmacy and Optometry, Faculty of Biology Medicine and Health, School of Health Science, University of Manchester, Manchester, United Kingdom.,Department of Applied Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
| | - James A L Brown
- Department of Biological Science, University of Limerick, Limerick, Ireland.,Discipline of Biochemistry, Centre for Chromosome Biology, School of Science, National University of Ireland Galway, Galway, Ireland.,Health Research Institute, University of Limerick, Limerick, Ireland
| | - Constantinos Demonacos
- Division of Pharmacy and Optometry, Faculty of Biology Medicine and Health, School of Health Science, University of Manchester, Manchester, United Kingdom
| | - Kaye J Williams
- Division of Pharmacy and Optometry, Faculty of Biology Medicine and Health, School of Health Science, University of Manchester, Manchester, United Kingdom
| |
Collapse
|
4
|
OFD Type I syndrome: lessons learned from a rare ciliopathy. Biochem Soc Trans 2021; 48:1929-1939. [PMID: 32897366 DOI: 10.1042/bst20191029] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/31/2020] [Accepted: 08/14/2020] [Indexed: 12/13/2022]
Abstract
The OFD1 gene was initially identified as the gene responsible for the X-linked dominant male lethal OFD type I syndrome, a developmental disorder ascribed to cilia disfunction. The transcript has been subsequently associated to four different X-linked recessive conditions, namely Joubert syndrome, retinitis pigmentosa, primary ciliary dyskinesia and Simpson-Golabi-Behmel type 2 syndrome. The centrosomal/basal body OFD1 protein has indeed been shown to be required for primary cilia formation and left-right asymmetry. The protein is also involved in other tasks, e.g. regulation of cellular protein content, constrain of the centriolar length, chromatin remodeling at DNA double strand breaks, control of protein quality balance and cell cycle progression, which might be mediated by non-ciliary activities. OFD1 represents a paradigmatic model of a protein that performs its diverse actions according to the cell needs and depending on the subcellular localization, the cell type/tissue and other possible factors still to be determined. An increased number of multitask protein, such as OFD1, may represent a partial explanation to human complexity, as compared with less complex organisms with an equal or slightly lower number of proteins.
Collapse
|
5
|
Chromatin control in double strand break repair. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2019. [PMID: 30798938 DOI: 10.1016/bs.apcsb.2018.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2023]
Abstract
DNA double strand breaks (DSB) are the most deleterious type of damage inflicted on DNA by various environmental factors and as consequences of normal cellular metabolism. The multistep nature of DSB repair and the need to assemble large protein complexes at repair sites necessitate multiple chromatin changes there. This review focuses on the key findings of how chromatin regulators exert temporal and spatial control on DSB repair. These mechanisms coordinate repair with cell cycle progression, lead to DSB repair pathway choice, provide accessibility of repair machinery to damaged sites and move the lesions to nuclear environments permissive for repair.
Collapse
|
6
|
Patchsung M, Settayanon S, Pongpanich M, Mutirangura D, Jintarith P, Mutirangura A. Alu siRNA to increase Alu element methylation and prevent DNA damage. Epigenomics 2018; 10:175-185. [PMID: 29336607 DOI: 10.2217/epi-2017-0096] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Global DNA hypomethylation promoting genomic instability leads to cancer and deterioration of human health with age. AIM To invent a biotechnology that can reprogram this process. METHODS We used Alu siRNA to direct Alu interspersed repetitive sequences methylation in human cells. We evaluated the correlation between DNA damage and Alu methylation levels. RESULTS We observed an inverse correlation between Alu element methylation and endogenous DNA damage in white blood cells. Cells transfected with Alu siRNA exhibited high Alu methylation levels, increased proliferation, reduced endogenous DNA damage and improved resistance to DNA damaging agents. CONCLUSION Alu methylation stabilizes the genome by preventing accumulation of DNA damage. Alu siRNA could be useful for evaluating reprograming of the global hypomethylation phenotype in cancer and aging cells.
Collapse
Affiliation(s)
- Maturada Patchsung
- Inter-Department Program of Biomedical Sciences, Faculty of Graduate School, Chulalongkorn University, Bangkok, Thailand
| | - Sirapat Settayanon
- Program of Medical Science, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Monnat Pongpanich
- Department of Mathematics & Computer Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.,Center for Excellence in Molecular Genetics of Cancer & Human Diseases, Chulalongkorn University, Bangkok, Thailand
| | - Dharm Mutirangura
- Center for Excellence in Molecular Genetics of Cancer & Human Diseases, Chulalongkorn University, Bangkok, Thailand
| | - Pornrutsami Jintarith
- Omics Sciences & Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Apiwat Mutirangura
- Center for Excellence in Molecular Genetics of Cancer & Human Diseases, Chulalongkorn University, Bangkok, Thailand.,Department of Tropical Nutrition & Food Science, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| |
Collapse
|
7
|
Palmieri D, Scarpa M, Tessari A, Uka R, Amari F, Lee C, Richmond T, Foray C, Sheetz T, Braddom A, Burd CE, Parvin JD, Ludwig T, Croce CM, Coppola V. Ran Binding Protein 9 (RanBP9) is a novel mediator of cellular DNA damage response in lung cancer cells. Oncotarget 2016; 7:18371-83. [PMID: 26943034 PMCID: PMC4951294 DOI: 10.18632/oncotarget.7813] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 01/29/2016] [Indexed: 01/27/2023] Open
Abstract
Ran Binding Protein 9 (RanBP9, also known as RanBPM) is an evolutionary conserved scaffold protein present both in the nucleus and the cytoplasm of cells whose biological functions remain elusive. We show that active ATM phosphorylates RanBP9 on at least two different residues (S181 and S603). In response to IR, RanBP9 rapidly accumulates into the nucleus of lung cancer cells, but this nuclear accumulation is prevented by ATM inhibition. RanBP9 stable silencing in three different lung cancer cell lines significantly affects the DNA Damage Response (DDR), resulting in delayed activation of key components of the cellular response to IR such as ATM itself, Chk2, γH2AX, and p53. Accordingly, abrogation of RanBP9 expression reduces homologous recombination-dependent DNA repair efficiency, causing an abnormal activation of IR-induced senescence and apoptosis. In summary, here we report that RanBP9 is a novel mediator of the cellular DDR, whose accumulation into the nucleus upon IR is dependent on ATM kinase activity. RanBP9 absence hampers the molecular mechanisms leading to efficient repair of damaged DNA, resulting in enhanced sensitivity to genotoxic stress. These findings suggest that targeting RanBP9 might enhance lung cancer cell sensitivity to genotoxic anti-neoplastic treatment.
Collapse
Affiliation(s)
- Dario Palmieri
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Mario Scarpa
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Anna Tessari
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
| | - Rexhep Uka
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Foued Amari
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Cindy Lee
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Timothy Richmond
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
| | - Claudia Foray
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Tyler Sheetz
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
| | - Ashley Braddom
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
| | - Christin E. Burd
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Jeffrey D. Parvin
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Thomas Ludwig
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| | - Carlo M. Croce
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
| | - Vincenzo Coppola
- Department of Molecular Virology, Immunology and Medical Genetics, College of Medicine, 43210 Columbus, OH, USA
- Solid Tumor Biology Program, Comprehensive Cancer Center, The Ohio State University, 43210 Columbus, OH, USA
| |
Collapse
|
8
|
Tauber M, Fischle W. Conserved linker regions and their regulation determine multiple chromatin-binding modes of UHRF1. Nucleus 2016; 6:123-32. [PMID: 25891992 PMCID: PMC4615792 DOI: 10.1080/19491034.2015.1026022] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Ubiquitin-like with PHD and RING Finger domains 1 (UHRF1) is an important nuclear protein that is mutated and aberrantly expressed in many tumors. The protein integrates different chromatin modifications and is essential for their maintenance throughout the cell cycle. Separate chromatin-binding modules of UHRF1 have been studied on a functional and structural level. The unmodified N-terminus of histone H3 is recognized by a PHD domain, while a TTD domain specifically interacts with histone H3 Lysine 9 trimethylation. A SRA region binds hemimethylatd DNA. Emerging evidence indicates that the modules of UHRF1 do not act independently of each other but establish complex modes of interaction with patterns of chromatin modifications. This multivalent readout is regulated by allosteric binding of phosphatidylinositol 5-phosphate to a region outside the PHD, TTD and SRA domains as well as by phosphorylation of one of the linker regions connecting these modules. Here, we summarize the current knowledge on UHRF1 chromatin interaction and introduce a novel model of conformational transitions of the protein that are directed by the flexible and highly charged linker regions. We propose that these are essential in setting up defined structural states of the protein where different domains or combinations thereof are available for binding chromatin modifications or are prevented from doing so. Lastly, we suggest that controlled tuning of intramolecular linker interactions by ligands and posttranslational modifications establishes a rational framework for comprehending UHRF1 regulation and putatively the working mode of other chromatin factors in different physiological contexts.
Collapse
Affiliation(s)
- Maria Tauber
- a Laboratory of Chromatin Biochemistry ; Max Planck Institute for Biophysical Chemistry ; Göttingen , Germany
| | | |
Collapse
|
9
|
Knauer SK, Mahendrarajah N, Roos WP, Krämer OH. The inducible E3 ubiquitin ligases SIAH1 and SIAH2 perform critical roles in breast and prostate cancers. Cytokine Growth Factor Rev 2015; 26:405-13. [DOI: 10.1016/j.cytogfr.2015.04.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Accepted: 04/27/2015] [Indexed: 12/15/2022]
|
10
|
Sun Y, Sun J, Lungchukiet P, Quarni W, Yang S, Zhang X, Bai W. Fe65 Suppresses Breast Cancer Cell Migration and Invasion through Tip60 Mediated Cortactin Acetylation. Sci Rep 2015; 5:11529. [PMID: 26166158 PMCID: PMC4499803 DOI: 10.1038/srep11529] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 05/20/2015] [Indexed: 11/30/2022] Open
Abstract
Fe65 is a brain-enriched adaptor protein known for its role in the action of the Aβ amyloid precursor protein in neuronal cells and Alzheimer’s disease, but little is known about its functions in cancer cells. The present study documents for the first time a role of Fe65 in suppressing breast cancer cell migration and invasion. Mechanistic studies suggest that the suppression is mediated through its phosphotyrosine binding domain 1 that mediates the recruitment of Tip60 to cortactin to stimulate its acetylation. The studies identify the Tip60 acetyltransferase as a cytoplasmic drug target for the therapeutic intervention of metastatic breast cancers.
Collapse
Affiliation(s)
- Yuefeng Sun
- Departments of Pathology and Cell Biology, University of South Florida Morsani College of Medicine, Tampa, FL 33612
| | - Jianwei Sun
- Comprehensive Melanoma Research Center and Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Panida Lungchukiet
- Departments of Pathology and Cell Biology, University of South Florida Morsani College of Medicine, Tampa, FL 33612
| | - Waise Quarni
- Departments of Pathology and Cell Biology, University of South Florida Morsani College of Medicine, Tampa, FL 33612
| | - Shengyu Yang
- Comprehensive Melanoma Research Center and Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Xiaohong Zhang
- 1] Departments of Pathology and Cell Biology, University of South Florida Morsani College of Medicine, Tampa, FL 33612 [2] Department of Oncological Sciences, University of South Florida Morsani College of Medicine, Tampa, FL 33612 [3] Program of Cancer Biology and Evolution, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Wenlong Bai
- 1] Departments of Pathology and Cell Biology, University of South Florida Morsani College of Medicine, Tampa, FL 33612 [2] Department of Oncological Sciences, University of South Florida Morsani College of Medicine, Tampa, FL 33612 [3] Program of Cancer Biology and Evolution, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| |
Collapse
|
11
|
Short-lived recombinant adeno-associated virus transgene expression in dystrophic muscle is associated with oxidative damage to transgene mRNA. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2015; 2:15010. [PMID: 26029721 PMCID: PMC4445007 DOI: 10.1038/mtm.2015.10] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 01/15/2015] [Accepted: 02/17/2015] [Indexed: 12/27/2022]
Abstract
Preclinical gene therapy strategies using recombinant adeno-associated virus (AAV) vectors in animal models of Duchenne muscular dystrophy have shown dramatic phenotype improvements, but long-lasting efficacy remains questionable. It is believed that in dystrophic muscles, transgene persistence is hampered, notably by the progressive loss of therapeutic vector genomes resulting from muscle fibers degeneration. Intracellular metabolic perturbations resulting from dystrophin deficiency could also be additional factors impacting on rAAV genomes and transgene mRNA molecular fate. In this study, we showed that rAAV genome loss is not the only cause of reduced transgene mRNA level and we assessed the contribution of transcriptional and post-transcriptional factors. We ruled out the implication of transgene silencing by epigenetic mechanisms and demonstrated that rAAV inhibition occurred mostly at the post-transcriptional level. Since Duchenne muscular dystrophy (DMD) physiopathology involves an elevated oxidative stress, we hypothesized that in dystrophic muscles, transgene mRNA could be damaged by oxidative stress. In the mouse and dog dystrophic models, we found that rAAV-derived mRNA oxidation was increased. Interestingly, when a high expression level of a therapeutic transgene is achieved, oxidation is less pronounced. These findings provide new insights into rAAV transductions in dystrophic muscles, which ultimately may help in the design of more effective clinical trials.
Collapse
|
12
|
p38MAPK and MK2 pathways are important for the differentiation-dependent human papillomavirus life cycle. J Virol 2014; 89:1919-24. [PMID: 25410865 DOI: 10.1128/jvi.02712-14] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Amplification of human papillomaviruses (HPV) is dependent on the ATM DNA damage pathway. In cells with impaired p53 activity, DNA damage repair requires the activation of p38MAPK along with MAPKAP kinase 2 (MK2). In HPV-positive cells, phosphorylation of p38 and MK2 proteins was induced along with relocalization to the cytoplasm. Treatment with MK2 or p38 inhibitors blocked HPV genome amplification, identifying the p38/MK2 pathway as a key regulator of the HPV life cycle.
Collapse
|
13
|
Nguyen TA, Menendez D, Resnick MA, Anderson CW. Mutant TP53 posttranslational modifications: challenges and opportunities. Hum Mutat 2014; 35:738-55. [PMID: 24395704 DOI: 10.1002/humu.22506] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 01/02/2014] [Indexed: 12/13/2022]
Abstract
The wild-type (WT) human p53 (TP53) tumor suppressor can be posttranslationally modified at over 60 of its 393 residues. These modifications contribute to changes in TP53 stability and in its activity as a transcription factor in response to a wide variety of intrinsic and extrinsic stresses in part through regulation of protein-protein and protein-DNA interactions. The TP53 gene frequently is mutated in cancers, and in contrast to most other tumor suppressors, the mutations are mostly missense often resulting in the accumulation of mutant (MUT) protein, which may have novel or altered functions. Most MUT TP53s can be posttranslationally modified at the same residues as in WT TP53. Strikingly, however, codons for modified residues are rarely mutated in human tumors, suggesting that TP53 modifications are not essential for tumor suppression activity. Nevertheless, these modifications might alter MUT TP53 activity and contribute to a gain-of-function leading to increased metastasis and tumor progression. Furthermore, many of the signal transduction pathways that result in TP53 modifications are altered or disrupted in cancers. Understanding the signaling pathways that result in TP53 modification and the functions of these modifications in both WT TP53 and its many MUT forms may contribute to more effective cancer therapies.
Collapse
Affiliation(s)
- Thuy-Ai Nguyen
- Chromosome Stability Section, Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina
| | | | | | | |
Collapse
|
14
|
Winck FV, Belloni M, Pauletti BA, Zanella JDL, Domingues RR, Sherman NE, Paes Leme AF. Phosphoproteome analysis reveals differences in phosphosite profiles between tumorigenic and non-tumorigenic epithelial cells. J Proteomics 2013; 96:67-81. [PMID: 24211406 DOI: 10.1016/j.jprot.2013.10.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 09/16/2013] [Accepted: 10/29/2013] [Indexed: 11/18/2022]
Abstract
UNLABELLED Oral cancer disease represents a significant fraction of all human cancer types and its poor early diagnosis contributes to reduced individual survival rate. The identification of proteins modulated in tumorigenic cells and its post-translational modifications may improve our understanding of tumor development in epithelial cells. We have analyzed the phosphoproteome of tumorigenic (SCC-9) and non-tumorigenic (HaCaT) cell lines using MS-based approach in order to identify phosphopeptides with differing patterns of modifications and/or abundance. Our results revealed the identity of 4,206 protein phosphorylation sites with sixty-two sites showing to be significantly modulated between the two cell lines. The phosphoproteome data showed an overrepresentation of proteins with a possible role in nuclear regulatory functions. Pathway analysis was further performed on the phosphoproteome dataset and differences and commonalities of the functional pathways present in tumorigenic and non-tumorigenic cells were identified. Phosphopeptides that belong to the proteins lamina-associated polypeptide 2 isoform alpha and serine-arginine repetitive matrix protein 2 were identified with differential abundance and they appear as promising tumor-related phosphopeptides. These two proteins may be related to the structural alterations generally found in the nucleus of tumorigenic cells. The identification of phosphorylation sites in tumorigenic cells may contribute to disclose novel signaling mechanisms associated with OSCC. SIGNIFICANCE Oral Squamous Cell Carcinoma (OSCC) is an important cancer disease affecting thousands of people worldwide. Many cellular processes related to the development of oral cancer remain unknown; however, the studies performed in vitro with cancer cells have contributed to guide more specific research which may be further performed by using in vivo approaches or clinical samples. To our knowledge, only few studies have been published showing the results of phosphoproteome profiling of squamous cell carcinoma models, and many signaling proteins must be identified and functionally characterized in order to increase the knowledge available about the complexity of the signaling networks responsible for oral cancer development and its progression. Furthermore, our knowledge regarding proteins exclusive or very low abundant in cancer cells remains limited. A better understanding of the differences between signaling pathways present in epithelial cell lines may contribute to reveal the processes underlying the OSCC.
Collapse
Affiliation(s)
- Flavia V Winck
- Laboratório Nacional de Biociências, LNBio, CNPEM, Campinas, SP, Brazil
| | - Marília Belloni
- Laboratório Nacional de Biociências, LNBio, CNPEM, Campinas, SP, Brazil
| | - Bianca A Pauletti
- Laboratório Nacional de Biociências, LNBio, CNPEM, Campinas, SP, Brazil
| | | | | | | | | |
Collapse
|