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Jamal A, Usman S, Teh MT, Waseem A. Preparation and Use of shRNA for Knocking Down Specific Genes. Methods Mol Biol 2024. [PMID: 38411888 DOI: 10.1007/7651_2024_515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Short hairpin RNA (shRNA) is a technique used to silence gene expression stably in various cells. There are however several reported problems. First, the cloning of oligos can lead to ligation of multiple copies; second, premature termination of sequencing reaction during confirmation of hairpin template; third, microdeletions/substitutions in hairpin during cloning; and fourth, off target effects. In this chapter, we have described a retrovirus transduction-based protocol that can be used on cells in culture without encountering any of the reported issues. We have used this protocol to clone shRNA templates for at least 10 different genes and confirmed them by dideoxy sequencing. The knockdown of 75-90% for two mRNA expressing genes, CDH5 and keratin KRT80, and a long non-coding RNA, XIST, is presented here.
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Affiliation(s)
- Ahmad Jamal
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Saima Usman
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
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Wan H, Teh MT, Mastroianni G, Ahmad US. Comparative Transcriptome Analysis Identifies Desmoglein-3 as a Potential Oncogene in Oral Cancer Cells. Cells 2023; 12:2710. [PMID: 38067138 PMCID: PMC10705960 DOI: 10.3390/cells12232710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/14/2023] [Accepted: 11/22/2023] [Indexed: 12/18/2023] Open
Abstract
The role of desmoglein-3 (DSG3) in oncogenesis is unclear. This study aimed to uncover molecular mechanisms through comparative transcriptome analysis in oral cancer cells, defining potential key genes and associated biological processes related to DSG3 expression. Four mRNA libraries of oral squamous carcinoma H413 cell lines were sequenced, and 599 candidate genes exhibited differential expression between DSG3-overexpressing and matched control lines, with 12 genes highly significantly differentially expressed, including 9 upregulated and 3 downregulated. Genes with known implications in cancer, such as MMP-13, KRT84, OLFM4, GJA1, AMOT and ADAMTS1, were strongly linked to DSG3 overexpression. Gene ontology analysis indicated that the DSG3-associated candidate gene products participate in crucial cellular processes such as junction assembly, focal adhesion, extracellular matrix formation, intermediate filament organisation and keratinocyte differentiation. Validation of RNA-Seq was performed through RT-qPCR, Western blotting and immunofluorescence analyses. Furthermore, using transmission electron microscopy, we meticulously examined desmosome morphology and revealed a slightly immature desmosome structure in DSG3-overexpressing cells compared to controls. No changes in desmosome frequency and diameter were observed between the two conditions. This study underscores intricate and multifaceted alterations associated with DSG3 in oral squamous carcinoma cells, implying a potential oncogenic role of this gene in biological processes that enable cell communication, motility and survival.
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Affiliation(s)
- Hong Wan
- Center for Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Muy-Teck Teh
- Center for Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Giulia Mastroianni
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London E1 4NS, UK
| | - Usama Sharif Ahmad
- Center for Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
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Khera N, Rajkumar AS, Abdulkader M Alkurdi K, Liu Z, Ma H, Waseem A, Teh MT. Identification of multidrug chemoresistant genes in head and neck squamous cell carcinoma cells. Mol Cancer 2023; 22:146. [PMID: 37667354 PMCID: PMC10476423 DOI: 10.1186/s12943-023-01846-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 08/18/2023] [Indexed: 09/06/2023] Open
Abstract
Multidrug resistance renders treatment failure in a large proportion of head and neck squamous cell carcinoma (HNSCC) patients that require multimodal therapy involving chemotherapy in conjunction with surgery and/or radiotherapy. Molecular events conferring chemoresistance remain unclear. Through transcriptome datamining, 28 genes were subjected to pharmacological and siRNA rescue functional assays on 12 strains of chemoresistant cell lines each against cisplatin, 5-fluorouracil (5FU), paclitaxel (PTX) and docetaxel (DTX). Ten multidrug chemoresistance genes (TOP2A, DNMT1, INHBA, CXCL8, NEK2, FOXO6, VIM, FOXM1B, NR3C1 and BIRC5) were identified. Of these, four genes (TOP2A, DNMT1, INHBA and NEK2) were upregulated in an HNSCC patient cohort (n = 221). Silencing NEK2 abrogated chemoresistance in all drug-resistant cell strains. INHBA and TOP2A were found to confer chemoresistance in majority of the drug-resistant cell strains whereas DNMT1 showed heterogeneous results. Pan-cancer Kaplan-Meier survival analysis on 21 human cancer types revealed significant prognostic values for INHBA and NEK2 in at least 16 cancer types. Drug library screens identified two compounds (Sirodesmin A and Carfilzomib) targeting both INHBA and NEK2 and re-sensitised cisplatin-resistant cells. We have provided the first evidence for NEK2 and INHBA in conferring chemoresistance in HNSCC cells and siRNA gene silencing of either gene abrogated multidrug chemoresistance. The two existing compounds could be repurposed to counteract cisplatin chemoresistance in HNSCC. This finding may lead to novel personalised biomarker-linked therapeutics that can prevent and/or abrogate chemoresistance in HNSCC and other tumour types with elevated NEK2 and INHBA expression. Further investigation is necessary to delineate their signalling mechanisms in tumour chemoresistance.
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Affiliation(s)
- Neha Khera
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK
| | - Asvika Soodhalaagunta Rajkumar
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK
| | - Khlood Abdulkader M Alkurdi
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK
| | - Zhiao Liu
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China
| | - Hong Ma
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China
| | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, E1 2AT, UK.
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China.
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Perussolo J, Teh MT, Gkranias N, Tiberi S, Petrie A, Cutino-Moguel MT, Donos N. Efficacy of three antimicrobial mouthwashes in reducing SARS-CoV-2 viral load in the saliva of hospitalized patients: a randomized controlled pilot study. Sci Rep 2023; 13:12647. [PMID: 37542087 PMCID: PMC10403620 DOI: 10.1038/s41598-023-39308-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 07/23/2023] [Indexed: 08/06/2023] Open
Abstract
This study aimed to evaluate the efficacy of 3 mouthwashes in reducing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) viral load in the saliva of coronavirus disease 2019 (COVID-19) patients at 30 min, 1, 2 and 3 h after rinsing. This pilot study included 40 admitted COVID-19 positive patients (10 in each group). Saliva samples were collected before rinsing and at 30 min, 1, 2 and 3 h after rinsing with: Group 1-0.2% Chlorhexidine digluconate (CHX); Group 2-1.5% Hydrogen peroxide (H2O2); Group 3-Cetylpyridinium chloride (CPC) or Group 4 (control group)-No rinsing. Viral load analysis of saliva samples was assessed by Reverse Transcription quantitative PCR. Mean log10 viral load at different time points was compared to that at baseline in all groups using a random effects linear regression analysis while for comparison between groups linear regression analysis was used. The results showed that all groups had a significantly reduced mean log10 viral load both at 2 (p = 0.036) and 3 (p = 0.041) hours compared to baseline. However, there was no difference in mean log10 viral load between any of the investigated mouthwashes and the control group (non-rinsing) at the evaluated time points. Although a reduction in the SARS-CoV-2 viral load in the saliva of COVID-19 patients was observed after rinsing with mouthwashes containing 0.2% CHX, 1.5% H2O2, or CPC, the reduction detected was similar to that achieved by the control group at the investigated time points. The findings of this study may suggest that the mechanical action of rinsing/spitting results in reduction of SARS-CoV-2 salivary load.
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Affiliation(s)
- Jeniffer Perussolo
- Centre for Oral Clinical Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Nikolaos Gkranias
- Centre for Oral Clinical Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK
| | - Simon Tiberi
- Barts and The London School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, London, UK
- Division of Infection, Newham and The Royal London Hospitals, Barts Health NHS Trust, London, UK
| | - Aviva Petrie
- Biostatistics Unit, Eastman Dental Institute, University College London, London, UK
| | | | - Nikolaos Donos
- Centre for Oral Clinical Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK.
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Usman S, Aldehlawi H, Nguyen TKN, Teh MT, Waseem A. Impact of N-Terminal Tags on De Novo Vimentin Intermediate Filament Assembly. Int J Mol Sci 2022; 23:ijms23116349. [PMID: 35683030 PMCID: PMC9181571 DOI: 10.3390/ijms23116349] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 06/02/2022] [Accepted: 06/04/2022] [Indexed: 02/01/2023] Open
Abstract
Vimentin, a type III intermediate filament protein, is found in most cells along with microfilaments and microtubules. It has been shown that the head domain folds back to associate with the rod domain and this association is essential for filament assembly. The N-terminally tagged vimentin has been widely used to label the cytoskeleton in live cell imaging. Although there is previous evidence that EGFP tagged vimentin fails to form filaments but is able to integrate into a pre-existing network, no study has systematically investigated or established a molecular basis for this observation. To determine whether a tag would affect de novo filament assembly, we used vimentin fused at the N-terminus with two different sized tags, AcGFP (239 residues, 27 kDa) and 3 × FLAG (22 residues; 2.4 kDa) to assemble into filaments in two vimentin-deficient epithelial cells, MCF-7 and A431. We showed that regardless of tag size, N-terminally tagged vimentin aggregated into globules with a significant proportion co-aligning with β-catenin at cell–cell junctions. However, the tagged vimentin aggregates could form filaments upon adding untagged vimentin at a ratio of 1:1 or when introduced into cells containing pre-existing filaments. The resultant filament network containing a mixture of tagged and untagged vimentin was less stable compared to that formed by only untagged vimentin. The data suggest that placing a tag at the N-terminus may create steric hinderance in case of a large tag (AcGFP) or electrostatic repulsion in case of highly charged tag (3 × FLAG) perhaps inducing a conformational change, which deleteriously affects the association between head and rod domains. Taken together our results shows that a free N-terminus is essential for filament assembly as N-terminally tagged vimentin is not only incapable of forming filaments, but it also destabilises when integrated into a pre-existing network.
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Affiliation(s)
- Saima Usman
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Newark Street, London E1 2AT, UK; (S.U.); (T.K.N.N.); (M.-T.T.)
| | - Hebah Aldehlawi
- Department of Oral Diagnostic Sciences, Division of Oral Pathology and Medicine, Faculty of Dentistry, King Abdul Aziz University, Jeddah 21589, Saudi Arabia;
| | - Thuan Khanh Ngoc Nguyen
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Newark Street, London E1 2AT, UK; (S.U.); (T.K.N.N.); (M.-T.T.)
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Newark Street, London E1 2AT, UK; (S.U.); (T.K.N.N.); (M.-T.T.)
| | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Newark Street, London E1 2AT, UK; (S.U.); (T.K.N.N.); (M.-T.T.)
- Centre for Immunobiology and Regenerative Medicine, Blizard Institute, 4 Newark Street, London E1 2AT, UK
- Correspondence: ; Tel.: +44-207-882-2387; Fax: +44-207-882-7137
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Mech AM, Merteroglu M, Sealy IM, Teh MT, White RJ, Havelange W, Brennan CH, Busch-Nentwich EM. Behavioral and Gene Regulatory Responses to Developmental Drug Exposures in Zebrafish. Front Psychiatry 2022; 12:795175. [PMID: 35082702 PMCID: PMC8785235 DOI: 10.3389/fpsyt.2021.795175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/29/2021] [Indexed: 01/22/2023] Open
Abstract
Developmental consequences of prenatal drug exposure have been reported in many human cohorts and animal studies. The long-lasting impact on the offspring-including motor and cognitive impairments, cranial and cardiac anomalies and increased prevalence of ADHD-is a socioeconomic burden worldwide. Identifying the molecular changes leading to developmental consequences could help ameliorate the deficits and limit the impact. In this study, we have used zebrafish, a well-established behavioral and genetic model with conserved drug response and reward pathways, to identify changes in behavior and cellular pathways in response to developmental exposure to amphetamine, nicotine or oxycodone. In the presence of the drug, exposed animals showed altered behavior, consistent with effects seen in mammalian systems, including impaired locomotion and altered habituation to acoustic startle. Differences in responses seen following acute and chronic exposure suggest adaptation to the presence of the drug. Transcriptomic analysis of exposed larvae revealed differential expression of numerous genes and alterations in many pathways, including those related to cell death, immunity and circadian rhythm regulation. Differential expression of circadian rhythm genes did not correlate with behavioral changes in the larvae, however, two of the circadian genes, arntl2 and per2, were also differentially expressed at later stages of development, suggesting a long-lasting impact of developmental exposures on circadian gene expression. The immediate-early genes, egr1, egr4, fosab, and junbb, which are associated with synaptic plasticity, were downregulated by all three drugs and in situ hybridization showed that the expression for all four genes was reduced across all neuroanatomical regions, including brain regions implicated in reward processing, addiction and other psychiatric conditions. We anticipate that these early changes in gene expression in response to drug exposure are likely to contribute to the consequences of prenatal exposure and their discovery might pave the way to therapeutic intervention to ameliorate the long-lasting deficits.
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Affiliation(s)
- Aleksandra M. Mech
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Munise Merteroglu
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - Ian M. Sealy
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, England, United Kingdom
| | - Richard J. White
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - William Havelange
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Caroline H. Brennan
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Elisabeth M. Busch-Nentwich
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
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Ponzoni L, Melzi G, Marabini L, Martini A, Petrillo G, Teh MT, Torres-Perez JV, Morara S, Gotti C, Braida D, Brennan CH, Sala M. Conservation of mechanisms regulating emotional-like responses on spontaneous nicotine withdrawal in zebrafish and mammals. Prog Neuropsychopharmacol Biol Psychiatry 2021; 111:110334. [PMID: 33905756 PMCID: PMC8380689 DOI: 10.1016/j.pnpbp.2021.110334] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 12/21/2022]
Abstract
BACKGROUND Nicotine withdrawal syndrome is a major clinical problem. Animal models with sufficient predictive validity to support translation of pre-clinical findings to clinical research are lacking. AIMS We evaluated the behavioural and neurochemical alterations in zebrafish induced by short- and long-term nicotine withdrawal. METHODS Zebrafish were exposed to 1 mg/L nicotine for 2 weeks. Dependence was determined using behavioural analysis following mecamylamine-induced withdrawal, and brain nicotinic receptor binding studies. Separate groups of nicotine-exposed and control fish were assessed for anxiety-like behaviours, anhedonia and memory deficits following 2-60 days spontaneous withdrawal. Gene expression analysis using whole brain samples from nicotine-treated and control fish was performed at 7 and 60 days after the last drug exposure. Tyrosine hydroxylase (TH) immunoreactivity in pretectum was also analysed. RESULTS Mecamylamine-precipitated withdrawal nicotine-exposed fish showed increased anxiety-like behaviour as evidenced by increased freezing and decreased exploration. 3H-Epibatidine labeled heteromeric nicotinic acethylcholine receptors (nAChR) significantly increased after 2 weeks of nicotine exposure while 125I-αBungarotoxin labeled homomeric nAChR remained unchanged. Spontaneous nicotine withdrawal elicited anxiety-like behaviour (increased bottom dwelling), reduced motivation in terms of no preference for the enriched side in a place preference test starting from Day 7 after withdrawal and a progressive decrease of memory attention (lowering discrimination index). Behavioural differences were associated with brain gene expression changes: nicotine withdrawn animals showed decreased expression of chrna 4 and chrna7 after 60 days, and of htr2a from 7 to 60 days.The expression of c-Fos was significantly increased at 7 days. Finally, Tyrosine hydroxylase (TH) immunoreactivity increased in dorsal parvocellular pretectal nucleus, but not in periventricular nucleus of posterior tuberculum nor in optic tectum, at 60 days after withdrawal. CONCLUSIONS Our findings show that nicotine withdrawal induced anxiety-like behaviour, cognitive alterations, gene expression changes and increase in pretectal TH expression, similar to those observed in humans and rodent models.
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Affiliation(s)
| | - Gloria Melzi
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Laura Marabini
- Department of Environmental Science and Policy, Università degli Studi di Milano, Milan, Italy
| | | | | | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, England, UK
| | - Jose V Torres-Perez
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | | | | | - Daniela Braida
- Department of Medical Biotechnology and Translational Medicine
| | - Caroline H Brennan
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
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Sapkota D, Sharma S, Søland TM, Braz-Silva PH, Teh MT. Expression profile of SARS-CoV-2 cellular entry proteins in normal oral mucosa and oral squamous cell carcinoma. Clin Exp Dent Res 2021; 8:117-122. [PMID: 34726347 PMCID: PMC8653086 DOI: 10.1002/cre2.510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 04/29/2021] [Accepted: 10/02/2021] [Indexed: 12/30/2022] Open
Abstract
Objective Besides angiotensin converting enzyme 2 (ACE2), an active involvement of proteases (FURIN and/or TMPRSS2) is important for cellular entry of SARS‐CoV‐2. Therefore, a simultaneous expression profiling of entry proteins in a tissue might provide a better risk assessment of SARS‐CoV‐2 infection as compared to individual proteins. In an attempt to understand the relative susceptibility of oral squamous cell carcinoma (OSCC) lesions as compared to the normal oral mucosa (NOM) for SARS‐CoV‐2 attachment/entry, this study examined the mRNA and protein expression profiles of ACE2, FURIN, and TMPRSS2 in the corresponding tissues using public transcriptomic and proteomics datasets. Methods and methods Public transcriptomic and proteomics datasets (the Cancer Genome Atlas (TCGA)/the Genotype‐Tissue Expression (GTEx), the Human Protein Atlas (HPA), and two independent microarray datasets) were used to examine the expression profiles of ACE2, TMPRSS2 and FURIN in NOM and OSCC. Results ACE2, TMPRSS2, and FURIN mRNAs were detected in NOM, however, at lower levels as compared to other body tissues. Except for moderate up‐regulation of FURIN, expression levels of ACE2 and TMPRSS2 mRNA were unchanged/down‐regulated in OSCC as compared to the NOM. Conclusions These results indicate that NOM may serve as a possible site for SARS‐CoV‐2 attachment, however, to a lesser extent as compared to organs with higher expression levels of the SARS‐CoV‐2 entry proteins. However, the evidence is lacking to suggest that expression status of entry proteins predisposes OSCC lesions to additional risk for SARS‐CoV‐2 attachment/entry as compared to NOM.
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Affiliation(s)
- Dipak Sapkota
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Sunita Sharma
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Tine M Søland
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway.,Department of Pathology, Rikshospitalet, Oslo University Hospital, Oslo, Norway
| | - Paulo H Braz-Silva
- Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.,Laboratory of Virology, Institute of Tropical Medicine of São Paulo, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.,China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guiyang, China
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Usman S, Waseem NH, Nguyen TKN, Mohsin S, Jamal A, Teh MT, Waseem A. Vimentin Is at the Heart of Epithelial Mesenchymal Transition (EMT) Mediated Metastasis. Cancers (Basel) 2021; 13:4985. [PMID: 34638469 PMCID: PMC8507690 DOI: 10.3390/cancers13194985] [Citation(s) in RCA: 128] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 09/29/2021] [Accepted: 10/02/2021] [Indexed: 12/12/2022] Open
Abstract
Epithelial-mesenchymal transition (EMT) is a reversible plethora of molecular events where epithelial cells gain the phenotype of mesenchymal cells to invade the surrounding tissues. EMT is a physiological event during embryogenesis (type I) but also happens during fibrosis (type II) and cancer metastasis (type III). It is a multifaceted phenomenon governed by the activation of genes associated with cell migration, extracellular matrix degradation, DNA repair, and angiogenesis. The cancer cells employ EMT to acquire the ability to migrate, resist therapeutic agents and escape immunity. One of the key biomarkers of EMT is vimentin, a type III intermediate filament that is normally expressed in mesenchymal cells but is upregulated during cancer metastasis. This review highlights the pivotal role of vimentin in the key events during EMT and explains its role as a downstream as well as an upstream regulator in this highly complex process. This review also highlights the areas that require further research in exploring the role of vimentin in EMT. As a cytoskeletal protein, vimentin filaments support mechanical integrity of the migratory machinery, generation of directional force, focal adhesion modulation and extracellular attachment. As a viscoelastic scaffold, it gives stress-bearing ability and flexible support to the cell and its organelles. However, during EMT it modulates genes for EMT inducers such as Snail, Slug, Twist and ZEB1/2, as well as the key epigenetic factors. In addition, it suppresses cellular differentiation and upregulates their pluripotent potential by inducing genes associated with self-renewability, thus increasing the stemness of cancer stem cells, facilitating the tumour spread and making them more resistant to treatments. Several missense and frameshift mutations reported in vimentin in human cancers may also contribute towards the metastatic spread. Therefore, we propose that vimentin should be a therapeutic target using molecular technologies that will curb cancer growth and spread with reduced mortality and morbidity.
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Affiliation(s)
- Saima Usman
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Str., London E1 2AT, UK; (S.U.); (T.K.N.N.); (A.J.); (M.-T.T.)
| | - Naushin H. Waseem
- UCL Institute of Ophthalmology, 11-43 Bath Str., London EC1V 9EL, UK;
| | - Thuan Khanh Ngoc Nguyen
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Str., London E1 2AT, UK; (S.U.); (T.K.N.N.); (A.J.); (M.-T.T.)
| | - Sahar Mohsin
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain 17666, United Arab Emirates;
| | - Ahmad Jamal
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Str., London E1 2AT, UK; (S.U.); (T.K.N.N.); (A.J.); (M.-T.T.)
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Str., London E1 2AT, UK; (S.U.); (T.K.N.N.); (A.J.); (M.-T.T.)
| | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Str., London E1 2AT, UK; (S.U.); (T.K.N.N.); (A.J.); (M.-T.T.)
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10
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Usman S, Jamal A, Teh MT, Waseem A. Major Molecular Signaling Pathways in Oral Cancer Associated With Therapeutic Resistance. Front Oral Health 2021; 1:603160. [PMID: 35047986 PMCID: PMC8757854 DOI: 10.3389/froh.2020.603160] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Accepted: 12/29/2020] [Indexed: 12/12/2022] Open
Abstract
Oral cancer is a sub-category of head and neck cancers that primarily initiates in the oral cavity. The primary treatment option for oral cancer remains surgery but it is associated with massive disfigurement, inability to carry out normal oral functions, psycho-social stress and exhaustive rehabilitation. Other treatment options such as chemotherapy and radiotherapy have their own limitations in terms of toxicity, intolerance and therapeutic resistance. Immunological treatments to enhance the body's ability to recognize cancer tissue as a foreign entity are also being used but they are new and underdeveloped. Although substantial progress has been made in the treatment of oral cancer, its complex heterogeneous nature still needs to be explored, to elucidate the molecular basis for developing resistance to therapeutic agents and how to overcome it, with the aim of improving the chances of patients' survival and their quality of life. This review provides an overview of up-to-date information on the complex role of the major molecules and associated signaling, epigenetic changes, DNA damage repair systems, cancer stem cells and micro RNAs in the development of therapeutic resistance and treatment failure in oral cancer. We have also summarized the current strategies being developed to overcome these therapeutic challenges. This review will help not only researchers but also oral oncologists in the management of the disease and in developing new therapeutic modalities.
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Affiliation(s)
| | | | | | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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11
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Ponzoni L, Teh MT, Torres-Perez JV, Brennan CH, Braida D, Sala M. Increased Response to 3,4-Methylenedioxymethamphetamine (MDMA) Reward and Altered Gene Expression in Zebrafish During Short- and Long-Term Nicotine Withdrawal. Mol Neurobiol 2020; 58:1650-1663. [PMID: 33236326 DOI: 10.1007/s12035-020-02225-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 11/19/2020] [Indexed: 01/09/2023]
Abstract
An interactive effect between nicotine and 3,4-methylenedioxymethamphetamine (MDMA) has been reported but the mechanism underlying such interaction is not completely understood. This study used zebrafish to explore gene expression changes associated with altered sensitivity to the rewarding effects of MDMA following 2-week exposure to nicotine and 2-60 days of nicotine withdrawal. Reward responses to MDMA were assessed using a conditioned place preference (CPP) paradigm and gene expression was evaluated using quantitative real-time PCR of mRNA from whole brain samples from drug-treated and control adult zebrafish. Zebrafish pre-exposed for 2 weeks to nicotine showed increased conditioned place preference in response to low-dose, 0.1 mg/kg, MDMA compared to un-exposed fish at 2, 7, 30 and 60 days withdrawal. Pre-exposure to nicotine for 2 weeks induced a significant increase of c-Fos and vasopressin receptor expression but a decrease of D3 dopaminergic and oxytocin receptor expression at 2 days of withdrawal. C-Fos mRNA increased also at 7, 30, 60 days of withdrawal. Nicotine pre-exposed zebrafish submitted to MDMA-induced CPP showed an increase in expression of p35 at day 2, α4 at day 30, vasopressin at day 7 and D3 dopaminergic receptor at day 7, 30 and 60. These gene alterations could account for the altered sensitivity to the rewarding effects of MDMA in nicotine pre-exposed fish, suggesting that zebrafish have an altered ability to modulate behaviour as a function of reward during nicotine withdrawal.
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Affiliation(s)
- Luisa Ponzoni
- Department of Medical Biotechnology and Translational Medicine, Università degli Studi di Milano, Milan, Italy
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, England, UK
| | - Jose V Torres-Perez
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Caroline H Brennan
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Daniela Braida
- Department of Medical Biotechnology and Translational Medicine, Università degli Studi di Milano, Milan, Italy
| | - Mariaelvina Sala
- Neuroscience Institute, CNR, Via Vanvitelli 32, 20129, Milan, Italy.
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12
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García-González J, Brock AJ, Parker MO, Riley RJ, Joliffe D, Sudwarts A, Teh MT, Busch-Nentwich EM, Stemple DL, Martineau AR, Kaprio J, Palviainen T, Kuan V, Walton RT, Brennan CH. Identification of slit3 as a locus affecting nicotine preference in zebrafish and human smoking behaviour. eLife 2020; 9:e51295. [PMID: 32209227 PMCID: PMC7096180 DOI: 10.7554/elife.51295] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 02/25/2020] [Indexed: 01/08/2023] Open
Abstract
To facilitate smoking genetics research we determined whether a screen of mutagenized zebrafish for nicotine preference could predict loci affecting smoking behaviour. From 30 screened F3 sibling groups, where each was derived from an individual ethyl-nitrosurea mutagenized F0 fish, two showed increased or decreased nicotine preference. Out of 25 inactivating mutations carried by the F3 fish, one in the slit3 gene segregated with increased nicotine preference in heterozygous individuals. Focussed SNP analysis of the human SLIT3 locus in cohorts from UK (n=863) and Finland (n=1715) identified two variants associated with cigarette consumption and likelihood of cessation. Characterisation of slit3 mutant larvae and adult fish revealed decreased sensitivity to the dopaminergic and serotonergic antagonist amisulpride, known to affect startle reflex that is correlated with addiction in humans, and increased htr1aa mRNA expression in mutant larvae. No effect on neuronal pathfinding was detected. These findings reveal a role for SLIT3 in development of pathways affecting responses to nicotine in zebrafish and smoking in humans.
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Affiliation(s)
- Judit García-González
- School of Biological and Chemical Sciences, Queen Mary, University of LondonLondonUnited Kingdom
| | - Alistair J Brock
- School of Biological and Chemical Sciences, Queen Mary, University of LondonLondonUnited Kingdom
| | - Matthew O Parker
- School of Pharmacy and Biomedical Science, University of PortsmouthPortsmouthUnited Kingdom
| | - Riva J Riley
- School of Biological and Chemical Sciences, Queen Mary, University of LondonLondonUnited Kingdom
| | - David Joliffe
- Barts and The London School of Medicine and Dentistry, Blizard InstituteLondonUnited Kingdom
| | - Ari Sudwarts
- School of Biological and Chemical Sciences, Queen Mary, University of LondonLondonUnited Kingdom
| | - Muy-Teck Teh
- Centre for Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and DentistryLondonUnited Kingdom
| | - Elisabeth M Busch-Nentwich
- Wellcome Trust Sanger InstituteCambridgeUnited Kingdom
- Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), Jeffrey Cheah Biomedical Centre, University of CambridgeCambridgeUnited Kingdom
| | | | - Adrian R Martineau
- Barts and The London School of Medicine and Dentistry, Blizard InstituteLondonUnited Kingdom
| | - Jaakko Kaprio
- Institute for Molecular Medicine FIMM, HiLIFEHelsinkiFinland
- Department of Public Health, Faculty of Medicine, University of HelsinkiHelsinkiFinland
| | | | - Valerie Kuan
- Institute of Cardiovascular Science, University College LondonLondonUnited Kingdom
| | - Robert T Walton
- Barts and The London School of Medicine and Dentistry, Blizard InstituteLondonUnited Kingdom
| | - Caroline H Brennan
- School of Biological and Chemical Sciences, Queen Mary, University of LondonLondonUnited Kingdom
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13
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Uttagomol J, Ahmad US, Rehman A, Huang Y, Laly AC, Kang A, Soetaert J, Chance R, Teh MT, Connelly JT, Wan H. Evidence for the Desmosomal Cadherin Desmoglein-3 in Regulating YAP and Phospho-YAP in Keratinocyte Responses to Mechanical Forces. Int J Mol Sci 2019; 20:ijms20246221. [PMID: 31835537 PMCID: PMC6940936 DOI: 10.3390/ijms20246221] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 12/14/2022] Open
Abstract
Desmoglein 3 (Dsg3) plays a crucial role in cell-cell adhesion and tissue integrity. Increasing evidence suggests that Dsg3 acts as a regulator of cellular mechanotransduction, but little is known about its direct role in mechanical force transmission. The present study investigated the impact of cyclic strain and substrate stiffness on Dsg3 expression and its role in mechanotransduction in keratinocytes. A direct comparison was made with E-cadherin, a well-characterized mechanosensor. Exposure of oral and skin keratinocytes to equiaxial cyclic strain promoted changes in the expression and localization of junction assembly proteins. The knockdown of Dsg3 by siRNA blocked strain-induced junctional remodeling of E-cadherin and Myosin IIa. Importantly, the study demonstrated that Dsg3 regulates the expression and localization of yes-associated protein (YAP), a mechanosensory, and an effector of the Hippo pathway. Furthermore, we showed that Dsg3 formed a complex with phospho-YAP and sequestered it to the plasma membrane, while Dsg3 depletion had an impact on both YAP and phospho-YAP in their response to mechanical forces, increasing the sensitivity of keratinocytes to the strain or substrate rigidity-induced nuclear relocation of YAP and phospho-YAP. Plakophilin 1 (PKP1) seemed to be crucial in recruiting the complex containing Dsg3/phospho-YAP to the cell surface since its silencing affected Dsg3 junctional assembly with concomitant loss of phospho-YAP at the cell periphery. Finally, we demonstrated that this Dsg3/YAP pathway has an influence on the expression of YAP1 target genes and cell proliferation. Together, these findings provide evidence of a novel role for Dsg3 in keratinocyte mechanotransduction.
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Affiliation(s)
- Jutamas Uttagomol
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Usama Sharif Ahmad
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Ambreen Rehman
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Yunying Huang
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Ana C. Laly
- Centre for Cell Biology and Cutaneous Research, Blizard Institute; Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (A.C.L.); (J.S.); (J.T.C.)
| | - Angray Kang
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Jan Soetaert
- Centre for Cell Biology and Cutaneous Research, Blizard Institute; Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (A.C.L.); (J.S.); (J.T.C.)
| | - Randy Chance
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
| | - John T. Connelly
- Centre for Cell Biology and Cutaneous Research, Blizard Institute; Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (A.C.L.); (J.S.); (J.T.C.)
| | - Hong Wan
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK; (J.U.); (U.S.A.); (A.R.); (Y.H.); (A.K.); (R.C.); (M.-T.T.)
- Correspondence: ; Tel.: +(44)-020-7882-7139; Fax: +(44)-020-7882-7137
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Roh V, Hiou-Feige A, Misetic V, Rivals JP, Sponarova J, Teh MT, Ferreira Lopes S, Truan Z, Mermod M, Monnier Y, Hess J, Tolstonog GV, Simon C. The transcription factor FOXM1 regulates the balance between proliferation and aberrant differentiation in head and neck squamous cell carcinoma. J Pathol 2019; 250:107-119. [PMID: 31465124 DOI: 10.1002/path.5342] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 08/01/2019] [Accepted: 08/22/2019] [Indexed: 12/11/2022]
Abstract
Sustained expression of FOXM1 is a hallmark of nearly all human cancers including squamous cell carcinomas of the head and neck (HNSCC). HNSCCs partially preserve the epithelial differentiation program, which recapitulates fetal and adult traits of the tissue of tumor origin but is deregulated by genetic alterations and tumor-supporting pathways. Using shRNA-mediated knockdown, we demonstrate a minimal impact of FOXM1 on proliferation and migration of HNSCC cell lines under standard cell culture conditions. However, FOXM1 knockdown in three-dimensional (3D) culture and xenograft tumor models resulted in reduced proliferation, decreased invasion, and a more differentiated-like phenotype, indicating a context-dependent modulation of FOXM1 activity in HNSCC cells. By ectopic overexpression of FOXM1 in HNSCC cell lines, we demonstrate a reduced expression of cutaneous-type keratin K1 and involucrin as a marker of squamous differentiation, supporting the role of FOXM1 in modulation of aberrant differentiation in HNSCC. Thus, our data provide a strong rationale for targeting FOXM1 in HNSCC. © 2019 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Vincent Roh
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Agnès Hiou-Feige
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Vinko Misetic
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Jean-Paul Rivals
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Jana Sponarova
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Silvia Ferreira Lopes
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Zinnia Truan
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Maxime Mermod
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Yan Monnier
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Jochen Hess
- Department of Otorhinolaryngology, Head and Neck Surgery, Heidelberg University Hospital and Molecular Mechanisms of Head and Neck Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Genrich V Tolstonog
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Christian Simon
- Department of Otolaryngology - Head and Neck Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
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15
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Stephanie Yeung JY, Teh MT, Hutchison I, Waseem A. qMIDS: A Digital Diagnostic Test for Oral Cancer. Br J Oral Maxillofac Surg 2019. [DOI: 10.1016/j.bjoms.2019.10.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Qadir F, Lalli A, Dar HH, Hwang S, Aldehlawi H, Ma H, Dai H, Waseem A, Teh MT. Clinical correlation of opposing molecular signatures in head and neck squamous cell carcinoma. BMC Cancer 2019; 19:830. [PMID: 31443700 PMCID: PMC6708230 DOI: 10.1186/s12885-019-6059-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 08/19/2019] [Indexed: 12/12/2022] Open
Abstract
Background The concept of head and neck cancers (HNSCC) having unique molecular signatures is well accepted but relating this to clinical presentation and disease behaviour is essential for patient benefit. Currently the clinical significance of HNSCC molecular subtypes is uncertain therefore personalisation of HNSCC treatment is not yet possible. Methods We performed meta-analysis on 8 microarray studies and identified six significantly up- (PLAU, FN1, CDCA5) and down-regulated (CRNN, CLEC3B and DUOX1) genes which were subsequently quantified by RT-qPCR in 100 HNSCC patient margin and core tumour samples. Results Retrospective correlation with sociodemographic and clinicopathological patient details identified two subgroups of opposing molecular signature (+q6 and -q6) that correlated to two recognised high-risk HNSCC populations in the UK. The +q6 group were older, male, and excessive alcohol users whilst the –q6 group were younger, female, paan-chewers and predominantly Bangladeshi. Additionally, all patients with tumour recurrence were in the latter subgroup. Conclusions We provide the first evidence linking distinct molecular signatures in HNSCC with clinical presentations. Prospective trials are required to determine the correlation between these distinct genotypes and disease progression or treatment response. This is an important step towards the ultimate goal of improving outcomes by utilising personalised molecular-signature-guided treatments for HNSCC patients.
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Affiliation(s)
- Fatima Qadir
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Anand Lalli
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Huma Habib Dar
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Sungjae Hwang
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Hebah Aldehlawi
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Hong Ma
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China
| | - Haiyan Dai
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China
| | - Ahmad Waseem
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, London, England, E1 2AT, UK. .,China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Stomatological Hospital of Guizhou Medical University, Guizhou, China. .,Cancer Research Institute, Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou, China.
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17
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Qadir F, Aziz MA, Sari CP, Ma H, Dai H, Wang X, Raithatha D, Da Silva LGL, Hussain M, Poorkasreiy SP, Hutchison IL, Waseem A, Teh MT. Transcriptome reprogramming by cancer exosomes: identification of novel molecular targets in matrix and immune modulation. Mol Cancer 2018; 17:97. [PMID: 30008265 PMCID: PMC6047127 DOI: 10.1186/s12943-018-0846-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 06/27/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Exosomes are extracellular vesicles released by almost all cell types, including cancer cells, into bodily fluids such as saliva, plasma, breast milk, semen, urine, cerebrospinal fluid, amniotic fluid, synovial fluid and sputum. Their key function being intercellular communication with both neighbouring as well as distant cells. Cancer exosomes have been shown to regulate organ-specific metastasis. However, little is known about the functional differences and molecular consequences of normal cells responding to exosomes derived from normal cells compared to those derived from cancer cells. METHODS Here, we characterised and compared the transcriptome profiles of primary human normal oral keratinocytes (HNOK) in response to exosomes isolated from either primary HNOK or head and neck squamous cell carcinoma (HNSCC) cell lines. RESULTS In recipient HNOK cells, we found that regardless of normal or cancer derived, exosomes altered molecular programmes involved in matrix modulation (MMP9), cytoskeletal remodelling (TUBB6, FEZ1, CCT6A), viral/dsRNA-induced interferon (OAS1, IFI6), anti-inflammatory (TSC22D3), deubiquitin (OTUD1), lipid metabolism and membrane trafficking (BBOX1, LRP11, RAB6A). Interestingly, cancer exosomes, but not normal exosomes, modulated expression of matrix remodelling (EFEMP1, DDK3, SPARC), cell cycle (EEF2K), membrane remodelling (LAMP2, SRPX), differentiation (SPRR2E), apoptosis (CTSC), transcription/translation (KLF6, PUS7). We have also identified CEP55 as a potential cancer exosomal marker. CONCLUSIONS In conclusion, both normal and cancer exosomes modulated unique gene expression pathways in normal recipient cells. Cancer cells may exploit exosomes to confer transcriptome reprogramming that leads to cancer-associated pathologies such as angiogenesis, immune evasion/modulation, cell fate alteration and metastasis. Molecular pathways and biomarkers identified in this study may be clinically exploitable for developing novel liquid-biopsy based diagnostics and immunotherapies.
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Affiliation(s)
- Fatima Qadir
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Mohammad Arshad Aziz
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Chrisdina Puspita Sari
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Hong Ma
- Department of Oral & Maxillofacial Surgery, China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Hospital & School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Haiyan Dai
- Department of Oral & Maxillofacial Surgery, China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Hospital & School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Xun Wang
- Department of Oral & Maxillofacial Surgery, China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Hospital & School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Dhiresh Raithatha
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Lucas Girotto Lagreca Da Silva
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Muhammad Hussain
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Seyedeh P Poorkasreiy
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Iain L Hutchison
- Department of Oral & Maxillofacial Surgery, Barts & The London NHS Trust, London, England, UK
| | - Ahmad Waseem
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK
| | - Muy-Teck Teh
- Centre for Oral Immunobiology & Regenerative Medicine, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, The Blizard Building, 4, Newark Street, E1 2AT, London, England, UK. .,Department of Oral & Maxillofacial Surgery, China-British Joint Molecular Head and Neck Cancer Research Laboratory, Affiliated Hospital & School of Stomatology, Guizhou Medical University, Guizhou, China. .,Cancer Research Institute, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China.
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Pantazi E, Gemenetzidis E, Teh MT, Reddy SV, Warnes G, Evagora C, Trigiante G, Philpott MP. GLI2 Is a Regulator of β-Catenin and Is Associated with Loss of E-Cadherin, Cell Invasiveness, and Long-Term Epidermal Regeneration. J Invest Dermatol 2017; 137:1719-1730. [PMID: 28300597 DOI: 10.1016/j.jid.2016.11.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 10/31/2016] [Accepted: 11/26/2016] [Indexed: 12/31/2022]
Abstract
Uncontrolled hedgehog (HH)/glioma-associated oncogene (GLI) and WNT/β-catenin signaling are important events in the genesis of many cancers including skin cancer and are often implicated in tumor progression, invasion, and metastasis. However, because of the complexity and context dependency of both pathways, little is known about HH and WNT interactions in human carcinogenesis. In the current study, we provide evidence of HH/glioma-associated oncogene family zinc finger 2 (GLI2)-WNT/β-catenin signaling crosstalk in human keratinocytes. Overexpression of GLI2ΔN in human keratinocytes resulted in cytoplasmic accumulation and nuclear relocalization of β-catenin in vitro and in 3D organotypic cultures, accompanied by upregulation of WNT genes. Induction of GLI2ΔN enhanced the β-catenin-dependent transcriptional activation and the subsequent activation of β-catenin target genes including cyclin-D1. Additionally, GLI2 overexpression was associated with decreased E-cadherin protein levels; increased expression of SNAIL, matrix metalloproteinase 2, and integrin β1; and increased cell invasion in 3D organotypic cultures. Invasion was reduced by WNT inhibition, thus unveiling the direct role of GLI2/WNT crosstalk in cell invasion. We show that GLI2 overexpression supported long-term epidermal regeneration in 3D organotypic cultures, and resulted in the manifestation of an undifferentiated basal/stem cell-associated phenotype in human keratinocytes. Both these observations are consistent with the role of β-catenin and SNAIL in epidermal stem cell maintenance. This work suggests that GLI2 is a regulator of β-catenin and provides insights into its role in tumorigenesis.
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Affiliation(s)
- Eleni Pantazi
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Emilios Gemenetzidis
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Muy-Teck Teh
- Department of Diagnostic and Oral Sciences, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Sreekanth Vootukuri Reddy
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Gary Warnes
- Imaging and Flow Cytometry Core facilities, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Chris Evagora
- Pathology Core facilities, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Giuseppe Trigiante
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Michael P Philpott
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
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19
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Parajuli H, Teh MT, Abrahamsen S, Christoffersen I, Neppelberg E, Lybak S, Osman T, Johannessen AC, Gullberg D, Skarstein K, Costea DE. Integrin α11 is overexpressed by tumour stroma of head and neck squamous cell carcinoma and correlates positively with alpha smooth muscle actin expression. J Oral Pathol Med 2016; 46:267-275. [PMID: 27699902 PMCID: PMC5396328 DOI: 10.1111/jop.12493] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2016] [Indexed: 01/17/2023]
Abstract
Background Cancer‐associated fibroblasts (CAFs) were shown to be important for tumour progression in head and neck squamous cell carcinomas (HNSCCs). Their heterogeneity and lack of specific markers is increasingly recognized. Integrin α11 was recently shown to be expressed by CAFs and might serve as a specific CAF marker. Aim To investigate integrin α11 expression and its correlation with the expression of a well‐known marker of CAF, alpha smooth muscle actin (α‐SMA), in HNSCC. Methods Fresh frozen (FF) and formalin‐fixed paraffin‐embedded (FFPE) samples from healthy volunteers (n = 24), oral lichen planus (OLP) (n = 32) and HNSCC (n = 106) were collected together with clinical data after ethical approval. Immunohistochemistry to detect integrin α11 and α‐SMA was performed on FF and FFPE samples. qPCR for integrin α11 (ITGA11) and α‐SMA(ACTA2) was performed on FF samples. Data were analysed using chi‐square test and Kaplan–Meier survival analysis. Results Significantly higher levels of integrin α11 and α‐SMA at both protein and mRNA levels were found in HNSCC vs. normal controls and OLP. A strong correlation was found between integrin α11 and α‐SMA expression, and double staining showed their colocalization. Both integrin α11 and α‐SMA were detected surrounding metastatic islands. Expression of α‐SMA at tumour front but not tumour centre correlated with patient survival. Conclusion Integrin α11 was overexpressed in HNSCC stroma and colocalized with α‐SMA. Expression of α‐SMA at tumour front but not tumour centre had prognostic value for survival, pinpointing the importance of assessing tumour front when evaluating stromal molecules as prognostic biomarkers.
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Affiliation(s)
- Himalaya Parajuli
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Department of Global Public Health and Primary Care, Centre for International Health, University of Bergen, Bergen, Norway
| | - Muy-Teck Teh
- Centre for Clinical & Diagnostic Oral Sciences, Barts & the London School of Medicine & Dentistry, Queen Mary University of London, London, UK
| | - Siren Abrahamsen
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway
| | - Ingrid Christoffersen
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway
| | - Evelyn Neppelberg
- Department of Oral Surgery, Institute of Clinical Dentistry, University of Bergen, Bergen, Norway.,Department of Maxillofacial Surgery, Head and Neck Clinic, Haukeland University Hospital, Bergen, Norway
| | - Stein Lybak
- Department of Maxillofacial Surgery, Head and Neck Clinic, Haukeland University Hospital, Bergen, Norway.,Department of Ear-Nose-and-Throat Surgery, Head and Neck Clinic, Haukeland University Hospital, Bergen, Norway
| | - Tarig Osman
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway
| | - Anne Chr Johannessen
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Department of Pathology, Haukeland University Hospital, Bergen, Norway
| | - Donald Gullberg
- Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Biomatrix Research Group, Department of Biomedicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway
| | - Kathrine Skarstein
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Department of Pathology, Haukeland University Hospital, Bergen, Norway
| | - Daniela Elena Costea
- Gade Laboratory for Pathology, Department of Clinical Medicine, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Department of Global Public Health and Primary Care, Centre for International Health, University of Bergen, Bergen, Norway.,Department of Pathology, Haukeland University Hospital, Bergen, Norway
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20
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Ma H, Dai H, Duan X, Tang Z, Liu R, Sun K, Zhou K, Chen H, Xiang H, Wang J, Gao Q, Zou Y, Wan H, Teh MT. Independent evaluation of a FOXM1-based quantitative malignancy diagnostic system (qMIDS) on head and neck squamous cell carcinomas. Oncotarget 2016; 7:54555-54563. [PMID: 27409343 PMCID: PMC5342363 DOI: 10.18632/oncotarget.10512] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 05/23/2016] [Indexed: 01/29/2023] Open
Abstract
The forkhead box M1 (FOXM1) transcription factor gene has been implicated in almost all human cancer types. It would be an ideal biomarker for cancer detection but, to date, its translation into a cancer diagnostic tool is yet to materialise. The quantitative Malignancy Index Diagnostic System (qMIDS) was the first FOXM1 oncogene-based diagnostic test developed for quantifying squamous cell carcinoma aggressiveness. The test was originally validated using head and neck squamous cell carcinomas (HNSCC) from European patients. The HNSCC gene expression signature across geographical and ethnic differences is unknown. This is the first study evaluated the FOXM1-based qMIDS test using HNSCC specimens donated by ethnic Chinese patients. We tested 50 Chinese HNSCC patients and 18 healthy subjects donated 68 tissues in total. qMIDS scores from the Chinese cohort were compared with the European datasets (n = 228). The median ± SD scores for the Chinese cohort were 1.13 ± 0.66, 4.02 ± 1.66 and 5.83 ± 3.13 in healthy oral tissues, adjacent tumour margin and HNSCC core tissue, respectively. Diagnostic test efficiency between the Chinese and European datasets was almost identical. Consistent with previous European data, qMIDS scores for HNSCC samples were not influenced by gender or age. The degree of HNSCC differentiation, clinical stage and lymphatic metastasis status were found to be correlated with qMIDS scores. This study provided the first evidence that the pathophysiology of HNSCC was molecularly indistinguishable between the Chinese and European specimens. The qMIDS test robustly quantifies a universal FOXM1-driven oncogenic program, at least in HNSCC, which transcends ethnicity, age, gender and geographic origins.
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Affiliation(s)
- Hong Ma
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Haiyan Dai
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Xiaofeng Duan
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Zhenglong Tang
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Rui Liu
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Kunjun Sun
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Ke Zhou
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Hao Chen
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Hang Xiang
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Jinsheng Wang
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Qiong Gao
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Yuan Zou
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
| | - Hong Wan
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
- Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, England, United Kingdom
| | - Muy-Teck Teh
- China-British Joint Molecular Head and Neck Cancer Research Laboratory, Department of Oral and Maxillofacial Surgery, Hospital and School of Stomatology, Guizhou Medical University, Guizhou, China
- Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, England, United Kingdom
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Parker MO, Evans AMD, Brock AJ, Combe FJ, Teh MT, Brennan CH. Moderate alcohol exposure during early brain development increases stimulus-response habits in adulthood. Addict Biol 2016; 21:49-60. [PMID: 25138642 DOI: 10.1111/adb.12176] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Exposure to alcohol during early central nervous system development has been shown variously to affect aspects of physiological and behavioural development. In extreme cases, this can extend to craniofacial defects, severe developmental delay and mental retardation. At more moderate levels, subtle differences in brain morphology and behaviour have been observed. One clear effect of developmental alcohol exposure is an increase in the propensity to develop alcoholism and other addictions. The mechanisms by which this occurs, however, are not currently understood. In this study, we tested the hypothesis that adult zebrafish chronically exposed to moderate levels of ethanol during early brain ontogenesis would show an increase in conditioned place preference for alcohol and an increased propensity towards habit formation, a key component of drug addiction in humans. We found support for both of these hypotheses and found that the exposed fish had changes in mRNA expression patterns for dopamine receptor, nicotinic acetylcholine receptor and μ-opioid receptor encoding genes. Collectively, these data show an explicit link between the increased proclivity for addiction and addiction-related behaviour following exposure to ethanol during early brain development and alterations in the neural circuits underlying habit learning.
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Affiliation(s)
- Matthew O. Parker
- School of Biological and Chemical Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
| | - Alexandra M-D. Evans
- School of Biological and Chemical Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
| | - Alistair J. Brock
- School of Biological and Chemical Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
| | - Fraser J. Combe
- School of Biological and Chemical Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
| | - Caroline H. Brennan
- School of Biological and Chemical Sciences; Barts and The London School of Medicine and Dentistry; Queen Mary University of London; UK
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22
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Parker MO, Brock AJ, Sudwarts A, Teh MT, Combe FJ, Brennan CH. Developmental role of acetylcholinesterase in impulse control in zebrafish. Front Behav Neurosci 2015; 9:271. [PMID: 26528153 PMCID: PMC4607786 DOI: 10.3389/fnbeh.2015.00271] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 09/22/2015] [Indexed: 01/25/2023] Open
Abstract
Cellular and molecular processes that mediate individual variability in impulsivity, a key behavioral component of many neuropsychiatric disorders, are poorly understood. Zebrafish heterozygous for a nonsense mutation in ache (achesb55/+) showed lower levels of impulsivity in a 5-choice serial reaction time task (5-CSRTT) than wild type and ache+∕+. Assessment of expression of cholinergic (nAChR), serotonergic (5-HT), and dopamine (DR) receptor mRNA in both adult and larval (9 dpf) achesb55/+ revealed significant downregulation of chrna2, chrna5, and drd2 mRNA in achesb55/+ larvae, but no differences in adults. Acute exposure to cholinergic agonist/antagonists had no effect on impulsivity, supporting the hypothesis that behavioral effects observed in adults were due to lasting impact of developmental alterations in cholinergic and dopaminergic signaling. This shows the cross-species role of cholinergic signaling during brain development in impulsivity, and suggests zebrafish may be a useful model for the role of cholinergic pathways as a target for therapeutic advances in addiction medicine.
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Affiliation(s)
- Matthew O Parker
- School of Biological and Chemical Sciences, Queen Mary University of London London, UK ; School of Health Sciences and Social Work, University of Portsmouth Portsmouth, UK
| | - Alistair J Brock
- School of Biological and Chemical Sciences, Queen Mary University of London London, UK
| | - Ari Sudwarts
- School of Biological and Chemical Sciences, Queen Mary University of London London, UK
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London London, UK
| | - Fraser J Combe
- School of Biological and Chemical Sciences, Queen Mary University of London London, UK
| | - Caroline H Brennan
- School of Biological and Chemical Sciences, Queen Mary University of London London, UK
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23
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Sapkota D, Bruland O, Parajuli H, Osman TA, Teh MT, Johannessen AC, Costea DE. S100A16 promotes differentiation and contributes to a less aggressive tumor phenotype in oral squamous cell carcinoma. BMC Cancer 2015; 15:631. [PMID: 26353754 PMCID: PMC4564982 DOI: 10.1186/s12885-015-1622-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 08/21/2015] [Indexed: 02/01/2023] Open
Abstract
Background Altered expression of S100A16 has been reported in human cancers, but its biological role in tumorigenesis is not fully understood. This study aimed to investigate the clinical significance and functional role of S100A16 in oral squamous cell carcinoma (OSCC) suppression. Methods S100A16 mRNA and/or protein levels were examined by quantitative RT-PCR and immunohistochemistry in whole- and laser microdissected-specimens of normal human oral mucosa (NHOM, n = 65), oral dysplastic lesions (ODL, n = 21), OSCCs (n = 132) and positive cervical nodes (n = 17). S100A16 protein expression in OSCC was examined for correlations with clinicopathological variables and patient survival. S100A16 was over-expressed and knocked-down in OSCC-derived (CaLH3 and H357) cells by employing retroviral constructs to investigate its effects on cell proliferation, sphere formation and three dimensional (3D)-organotypic invasive abilities in vitro and tumorigenesis in a mouse xenograft model. Results Both S100A16 mRNA and protein levels were found to be progressively down-regulated from NHOM to ODL and OSCC. Low S100A16 protein levels in OSCC significantly correlated with reduced 10-year overall survival and poor tumor differentiation. Analysis of two external OSCC microarray datasets showed a positive correlation between the mRNA expression levels of S100A16 and keratinocyte differentiation markers. CaLH3 and H357 cell fractions enriched for differentiated cells either by lack of adherence to collagen IV or FACS sorting for low p75NTR expression expressed significantly higher S100A16 mRNA levels than the subpopulations enriched for less differentiated cells. Corroborating these findings, retroviral mediated S100A16 over-expression and knock-down in CaLH3 and H357 cells led to respective up- and down-regulation of differentiation markers. In vitro functional studies showed significant reduction in cell proliferation, sphere formation and 3D-invasive abilities of CaLH3 and H357 cells upon S100A16 over-expression. These functional effects were associated with concomitant down-regulation of self-renewal (Bmi-1 and Oct 4A) and invasion related (MMP1 and MMP9) molecules. S100A16 over-expression also suppressed tumorigenesis of H357 cells in a mouse xenograft model and the resulting tumor xenografts displayed features/expression of increased differentiation and reduced proliferation/self-renewal. Conclusions These results indicate that S100A16 is a differentiation promoting protein and might function as a tumor suppressor in OSCC. Electronic supplementary material The online version of this article (doi:10.1186/s12885-015-1622-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Dipak Sapkota
- Department of Clinical Medicine, The Gade Laboratory for Pathology, University of Bergen, Haukeland University Hospital, N-5021, Bergen, Norway. .,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, N-5021, Bergen, Norway.
| | - Ove Bruland
- Center of Medical Genetics and Molecular Medicine, Haukeland University Hospital, University of Bergen, N-5021, Bergen, Norway.
| | - Himalaya Parajuli
- Department of Clinical Medicine, The Gade Laboratory for Pathology, University of Bergen, Haukeland University Hospital, N-5021, Bergen, Norway. .,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, N-5021, Bergen, Norway.
| | - Tarig A Osman
- Department of Clinical Medicine, The Gade Laboratory for Pathology, University of Bergen, Haukeland University Hospital, N-5021, Bergen, Norway. .,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, N-5021, Bergen, Norway.
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, England, UK.
| | - Anne C Johannessen
- Department of Clinical Medicine, The Gade Laboratory for Pathology, University of Bergen, Haukeland University Hospital, N-5021, Bergen, Norway. .,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, N-5021, Bergen, Norway. .,Department of Pathology, Haukeland University Hospital, Bergen, Norway.
| | - Daniela Elena Costea
- Department of Clinical Medicine, The Gade Laboratory for Pathology, University of Bergen, Haukeland University Hospital, N-5021, Bergen, Norway. .,Centre for Cancer Biomarkers (CCBIO), Faculty of Medicine and Dentistry, University of Bergen, N-5021, Bergen, Norway. .,Department of Pathology, Haukeland University Hospital, Bergen, Norway.
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Parker MO, Annan LV, Kanellopoulos AH, Brock AJ, Combe FJ, Baiamonte M, Teh MT, Brennan CH. The utility of zebrafish to study the mechanisms by which ethanol affects social behavior and anxiety during early brain development. Prog Neuropsychopharmacol Biol Psychiatry 2014; 55:94-100. [PMID: 24690524 PMCID: PMC4186787 DOI: 10.1016/j.pnpbp.2014.03.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 03/07/2014] [Accepted: 03/21/2014] [Indexed: 01/31/2023]
Abstract
Exposure to moderate levels of ethanol during brain development has a number of effects on social behavior but the molecular mechanisms that mediate this are not well understood. Gaining a better understanding of these factors may help to develop therapeutic interventions in the future. Zebrafish offer a potentially useful model in this regard. Here, we introduce a zebrafish model of moderate prenatal ethanol exposure. Embryos were exposed to 20mM ethanol for seven days (48hpf-9dpf) and tested as adults for individual social behavior and shoaling. We also tested their basal anxiety with the novel tank diving test. We found that the ethanol-exposed fish displayed reductions in social approach and shoaling, and an increase in anxiety in the novel tank test. These behavioral differences corresponded to differences in hrt1aa, slc6a4 and oxtr expression. Namely, acute ethanol caused a spike in oxtr and ht1aa mRNA expression, which was followed by down-regulation at 7dpf, and an up-regulation in slc6a4 at 72hpf. This study confirms the utility of zebrafish as a model system for studying the molecular basis of developmental ethanol exposure. Furthermore, it proposes a putative developmental mechanism characterized by ethanol-induced OT inhibition leading to suppression of 5-HT and up-regulation of 5-HT1A, which leads, in turn, to possible homeostatic up-regulation of 5-HTT at 72hpf and subsequent imbalance of the 5-HT system.
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Affiliation(s)
- Matthew O Parker
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Leonette V Annan
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Alexandros H Kanellopoulos
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Alistair J Brock
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Fraser J Combe
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Matteo Baiamonte
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Muy-Teck Teh
- Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AD, United Kingdom
| | - Caroline H Brennan
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom.
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Hwang S, Mahadevan S, Qadir F, Hutchison IL, Costea DE, Neppelberg E, Liavaag PG, Waseem A, Teh MT. Identification of FOXM1-induced epigenetic markers for head and neck squamous cell carcinomas. Cancer 2013; 119:4249-58. [DOI: 10.1002/cncr.28354] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 07/22/2013] [Accepted: 08/02/2013] [Indexed: 12/14/2022]
Affiliation(s)
- Sungjae Hwang
- Centre for Clinical and Diagnostic Oral Sciences; Institute of Dentistry; Barts & The London School of Medicine and Dentistry; Queen Mary University of London; England United Kingdom
| | - Swarna Mahadevan
- Centre for Clinical and Diagnostic Oral Sciences; Institute of Dentistry; Barts & The London School of Medicine and Dentistry; Queen Mary University of London; England United Kingdom
| | - Fatima Qadir
- Centre for Clinical and Diagnostic Oral Sciences; Institute of Dentistry; Barts & The London School of Medicine and Dentistry; Queen Mary University of London; England United Kingdom
| | - Iain L. Hutchison
- Department of Oral & Maxillofacial Surgery; Barts & The London NHS Trust; London England United Kingdom
| | - Daniela Elena Costea
- The Gade Laboratory of Pathology; Department of Clinical Medicine; University of Bergen; and Department of Pathology; Haukeland University Hospital; Bergen Norway
| | - Evelyn Neppelberg
- Department of Oral Surgery; Haukeland University Hospital; and Institute of Clinical Dentistry; University of Bergen; Bergen Norway
| | - Per Gunnar Liavaag
- Department of Otolaryngology and Head & Neck Surgery; Head and Neck Clinic; Haukeland University Hospital; Bergen Norway
| | - Ahmad Waseem
- Centre for Clinical and Diagnostic Oral Sciences; Institute of Dentistry; Barts & The London School of Medicine and Dentistry; Queen Mary University of London; England United Kingdom
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences; Institute of Dentistry; Barts & The London School of Medicine and Dentistry; Queen Mary University of London; England United Kingdom
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26
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Bose A, Teh MT, Mackenzie IC, Waseem A. Keratin k15 as a biomarker of epidermal stem cells. Int J Mol Sci 2013; 14:19385-98. [PMID: 24071939 PMCID: PMC3821562 DOI: 10.3390/ijms141019385] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 09/05/2013] [Accepted: 09/10/2013] [Indexed: 01/21/2023] Open
Abstract
Keratin 15 (K15) is type I keratin protein co-expressed with the K5/K14 pair present in the basal keratinocytes of all stratified epithelia. Although it is a minor component of the cytoskeleton with a variable expression pattern, nonetheless its expression has been reported as a stem cell marker in the bulge of hair follicles. Conversely, suprabasal expression of K15 has also been reported in both normal and diseased tissues, which is inconsistent with its role as a stem cell marker. Our recently published work has given evidence of the molecular pathways that seem to control the expression of K15 in undifferentiated and differentiated cells. In this article, we have critically reviewed the published work to establish the reliability of K15 as an epidermal stem cell marker.
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Affiliation(s)
- Amrita Bose
- Centre for Clinical and Diagnostic Oral Sciences, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK.
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Teh MT, Hutchison IL, Costea DE, Neppelberg E, Liavaag PG, Purdie K, Harwood C, Wan H, Odell EW, Hackshaw A, Waseem A. Exploiting FOXM1-orchestrated molecular network for early squamous cell carcinoma diagnosis and prognosis. Int J Cancer 2012; 132:2095-106. [DOI: 10.1002/ijc.27886] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 09/05/2012] [Indexed: 01/11/2023]
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Abstract
A decade since the first evidence implicating the cell cycle transcription factor Forkhead Box M1 (FOXM1) in human tumorigenesis, a slew of subsequent studies revealed an oncogenic role of FOXM1 in the majority of human cancers including oral, nasopharynx, oropharynx, esophagus, breast, ovary, prostate, lung, liver, pancreas, kidney, colon, brain, cervix, thyroid, bladder, uterus, testis, stomach, skin, and blood. Its aberrant upregulation in almost all different cancer types suggests a fundamental role for FOXM1 in tumorigenesis. Its dose-dependent expression pattern correlated well with tumor progression starting from cancer predisposition and initiation, early premalignancy and progression, to metastatic invasion. In addition, emerging studies have demonstrated a causal link between FOXM1 and chemotherapeutic drug resistance. Despite the well-established multifaceted roles for FOXM1 in all stages of oncogenesis, its translation into clinical benefit is yet to materialize. In this contribution, I reviewed and discussed how our current knowledge on the oncogenic mechanisms of FOXM1 could be exploited for clinical use as biomarker for risk prediction, early cancer screening, molecular diagnostics/prognostics, and/or companion diagnostics for personalized cancer therapy.
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Affiliation(s)
- Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Barts and The London School of Medicine and Dentistry, Queen Mary University of London London, UK
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Affiliation(s)
- Muy-Teck Teh
- Centre for Clinical & Diagnostic Oral Sciences, Barts & The London School of Medicine & Dentistry, Queen Mary University of London, The Blizard Building, 4 Newark Street, London E1 2AT, UK
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Bose A, Teh MT, Hutchison IL, Wan H, Leigh IM, Waseem A. Two mechanisms regulate keratin K15 expression in keratinocytes: role of PKC/AP-1 and FOXM1 mediated signalling. PLoS One 2012; 7:e38599. [PMID: 22761689 PMCID: PMC3384677 DOI: 10.1371/journal.pone.0038599] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Accepted: 05/08/2012] [Indexed: 01/24/2023] Open
Abstract
Background Keratin 15 (K15) is a type I keratin that is used as a marker of stem cells. Its expression is restricted to the basal layer of stratified epithelia, and the bulge in hair follicles. However, in certain clinical situations including oral lichen planus, K15 is induced in suprabasal layers, which is inconsistent with the role of a stem cell marker. This study provides insights into the mechanisms of K15 expression in the basal and differentiating keratinocytes. Methodology/Principal Findings Human keratinocytes were differentiated by three different methods; suspension in methylcellulose, high cell density and treatment with phorbol ester. The expression of mRNA was determined by quantitative PCR and protein by western blotting and immunostaining. Keratinocytes in suspension suppressed β1-integrin expression, induced differentiation-specific markers and K15, whereas FOXM1 (a cell cycle regulated protein) and K14 were downregulated. Rescuing β1-integrin by either fibronectin or the arginine-glycine-aspartate peptide suppressed K15 but induced K14 and FOXM1 expression. Specific inhibition of PKCδ, by siRNA, and AP-1 transcription factor, by TAM67 (dominant negative c-Jun), suppressed K15 expression, suggesting that PKC/AP-1 pathway plays a role in the differentiation-specific expression of K15. The basal cell-specific K15 expression may involve FOXM1 because ectopic expression of the latter is known to induce K15. Using chromatin immunoprecipitation, we have identified a single FOXM1 binding motif in the K15 promoter. Conclusions/Significance The data suggests that K15 is induced during terminal differentiation mediated by the down regulation of β1-integrin. However, this cannot be the mechanism of basal/stem cell-specific K15 expression in stratified epithelia, because basal keratinocytes do not undergo terminal differentiation. We propose that there are two mechanisms regulating K15 expression in stratified epithelia; differentiation-specific involving PKC/AP-1 pathway, and basal-specific mediated by FOXM1, and therefore the use of K15 expression as a marker of stem cells must be viewed with caution.
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Affiliation(s)
- Amrita Bose
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Iain L. Hutchison
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Hong Wan
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Irene M. Leigh
- Division of Cancer, Medical Research Institute, University of Dundee, Dundee, United Kingdom
| | - Ahmad Waseem
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
- * E-mail:
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Teh MT, Gemenetzidis E, Patel D, Tariq R, Nadir A, Bahta AW, Waseem A, Hutchison IL. FOXM1 induces a global methylation signature that mimics the cancer epigenome in head and neck squamous cell carcinoma. PLoS One 2012; 7:e34329. [PMID: 22461910 PMCID: PMC3312909 DOI: 10.1371/journal.pone.0034329] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Accepted: 02/26/2012] [Indexed: 12/31/2022] Open
Abstract
The oncogene FOXM1 has been implicated in all major types of human cancer. We recently showed that aberrant FOXM1 expression causes stem cell compartment expansion resulting in the initiation of hyperplasia. We have previously shown that FOXM1 regulates HELLS, a SNF2/helicase involved in DNA methylation, implicating FOXM1 in epigenetic regulation. Here, we have demonstrated using primary normal human oral keratinocytes (NOK) that upregulation of FOXM1 suppressed the tumour suppressor gene p16(INK4A) (CDKN2A) through promoter hypermethylation. Knockdown of HELLS using siRNA re-activated the mRNA expression of p16(INK4A) and concomitant downregulation of two DNA methyltransferases DNMT1 and DNMT3B. The dose-dependent upregulation of endogenous FOXM1 (isoform B) expression during tumour progression across a panel of normal primary NOK strains (n = 8), dysplasias (n = 5) and head and neck squamous cell carcinoma (HNSCC) cell lines (n = 11) correlated positively with endogenous expressions of HELLS, BMI1, DNMT1 and DNMT3B and negatively with p16(INK4A) and involucrin. Bisulfite modification and methylation-specific promoter analysis using absolute quantitative PCR (MS-qPCR) showed that upregulation of FOXM1 significantly induced p16(INK4A) promoter hypermethylation (10-fold, P<0.05) in primary NOK cells. Using a non-bias genome-wide promoter methylation microarray profiling method, we revealed that aberrant FOXM1 expression in primary NOK induced a global hypomethylation pattern similar to that found in an HNSCC (SCC15) cell line. Following validation experiments using absolute qPCR, we have identified a set of differentially methylated genes, found to be inversely correlated with in vivo mRNA expression levels of clinical HNSCC tumour biopsy samples. This study provided the first evidence, using primary normal human cells and tumour tissues, that aberrant upregulation of FOXM1 orchestrated a DNA methylation signature that mimics the cancer methylome landscape, from which we have identified a unique FOXM1-induced epigenetic signature which may have clinical translational potentials as biomarkers for early cancer screening, diagnostic and/or therapeutic interventions.
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Affiliation(s)
- Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, England, United Kingdom.
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Pitiyage GN, Lim KP, Gemenitzidis E, Teh MT, Waseem A, Prime SS, Tilakaratne WM, Fortune F, Parkinson EK. Increased secretion of tissue inhibitors of metalloproteinases 1 and 2 (TIMPs -1 and -2) in fibroblasts are early indictors of oral sub-mucous fibrosis and ageing. J Oral Pathol Med 2012; 41:454-62. [DOI: 10.1111/j.1600-0714.2012.01129.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Tsang SM, Liu L, Teh MT, Wheeler A, Grose R, Hart IR, Garrod DR, Fortune F, Wan H. Desmoglein 3, via an interaction with E-cadherin, is associated with activation of Src. PLoS One 2010; 5:e14211. [PMID: 21151980 PMCID: PMC2997060 DOI: 10.1371/journal.pone.0014211] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Accepted: 11/12/2010] [Indexed: 01/03/2023] Open
Abstract
Background Desmoglein 3 (Dsg3), a desmosomal adhesion protein, is expressed in basal and immediate suprabasal layers of skin and across the entire stratified squamous epithelium of oral mucosa. However, increasing evidence suggests that the role of Dsg3 may involve more than just cell-cell adhesion. Methodology/Principal Findings To determine possible additional roles of Dsg3 during epithelial cell adhesion we used overexpression of full-length human Dsg3 cDNA, and RNAi-mediated knockdown of this molecule in various epithelial cell types. Overexpression of Dsg3 resulted in a reduced level of E-cadherin but a colocalisation with the E-cadherin-catenin complex of the adherens junctions. Concomitantly these transfected cells exhibited marked migratory capacity and the formation of filopodial protrusions. These latter events are consistent with Src activation and, indeed, Src-specific inhibition reversed these phenotypes. Moreover Dsg3 knockdown, which also reversed the decreased level of E-cadherin, partially blocked Src phosphorylation. Conclusions/Significance Our data are consistent with the possibility that Dsg3, as an up-stream regulator of Src activity, helps regulate adherens junction formation.
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Affiliation(s)
- Siu Man Tsang
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Li Liu
- Centre for Infectious Disease, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Ann Wheeler
- Imaging Facility, Blizard Institute of Cell and Molecular Sciences, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Richard Grose
- Centre for Tumor Biology, Institute of Cancer, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Ian R. Hart
- Centre for Tumor Biology, Institute of Cancer, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - David R. Garrod
- Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
- King Saud University, Riyadh, Saudi Arabia
| | - Farida Fortune
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
| | - Hong Wan
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom
- * E-mail:
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Abstract
Stem cells are permanent residents of tissues and thought to be targets of cancer initiation. The frequent, and often early, upregulation of the FOXM1 transcription factor in the majority of human cancers suggests that it may participate in the initiation of human tumorigenesis. However, this hypothesis has not been tested. Herein, we show that targeting the ectopic expression of FOXM1 to the highly clonogenic cells of primary human keratinocytes with stem/progenitor cell properties, but not to differentiating cells, caused clonal expansion in vitro. We show, using a functional three-dimensional organotypic epithelial tissue regeneration system, that ectopic FOXM1 expression perturbed epithelial differentiation generating a hyperproliferative phenotype reminiscent of that seen in human epithelial hyperplasia. Furthermore, transcriptional expression analysis of a panel of 28 epithelial differentiation-specific genes reveals a role for FOXM1 in the suppression of epithelial differentiation. This study provides the first evidence that FOXM1 participates in an early oncogenic pathway that predisposes cells to tumorigenesis by expanding the stem/progenitor compartment and deregulating subsequent keratinocyte terminal differentiation. This finding reveals an important window of susceptibility to oncogenic signals in epithelial stem/progenitor cells prior to differentiation, and may provide a significant benefit to the design of cancer therapeutic interventions that target oncogenesis at its earliest incipient stage.
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Affiliation(s)
- Emilios Gemenetzidis
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Institute of Dentistry, Centre for Clinical and Diagnostic Oral Sciences, London, England
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Teh MT, Parkinson EK, Thurlow JK, Liu F, Fortune F, Wan H. A molecular study of desmosomes identifies a desmoglein isoform switch in head and neck squamous cell carcinoma. J Oral Pathol Med 2010; 40:67-76. [PMID: 20923451 DOI: 10.1111/j.1600-0714.2010.00951.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Desmosomes, the intercellular junctions that confer strong adhesion between epithelial cells, are frequently altered in malignancy. However, a comprehensive analysis of these structures has not been carried out in oral neoplasia. Oral squamous cell carcinomas (SCCs) and pre-malignant dysplasia can be sub-classified according to their in vitro replicative lifespan, where the immortal dysplasia (ID) and carcinoma (IC) subsets have p16(ink4a) and p53 dysfunction, telomerase deregulation and genetic instability and the mortal subset (MD and MC) do not. We found that the desmosomal proteins exhibit a distinct expression pattern in oral mucosa when compared with epidermis in vivo. Microarray data from a large panel of lines revealed that the transcript levels of DSG3, DSC2/3, DP, PG and PKP1 were reduced in ID and IC. Interestingly, DSG2 was up-regulated in MC. Reduction of DSG3 and up-regulation of DSG2 were found in two independent microarray datasets. Significantly, we demonstrated that reduction of DSG3 and up-regulation of DSG2 was reversible in vitro by using RNAi-mediated knockdown of DSG2 in IC cells. The remaining desmosomal proteins were largely disrupted or internalized and associated with retraction of keratin intermediate filaments in oral SCC lines. These findings suggest dysfunction and loss of desmosomal components are common events in the immortal class of oral SCC and that these events may precede overt malignancy.
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Affiliation(s)
- Muy-Teck Teh
- Queen Mary University of London, Barts & The London, School of Medicine and Dentistry, Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, London, UK
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Waseem A, Ali M, Odell EW, Fortune F, Teh MT. Downstream targets of FOXM1: CEP55 and HELLS are cancer progression markers of head and neck squamous cell carcinoma. Oral Oncol 2010; 46:536-42. [PMID: 20400365 DOI: 10.1016/j.oraloncology.2010.03.022] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 03/18/2010] [Accepted: 03/18/2010] [Indexed: 12/17/2022]
Abstract
We recently showed that upregulation of a key oncogene FOXM1 precedes head and neck squamous cell carcinoma (HNSCC) malignancy. Furthermore, we also identified a centrosomal protein CEP55 and a DNA helicase/putative stem cell marker HELLS, which are both downstream targets of FOXM1. In this study, we have investigated the expression profiles of CEP55 and HELLS using immunohistochemistry and quantified by digital densitometry in a tissue panel (20 samples) consisting of normal oral mucosa, dysplasias, HNSCC and lymph node metastasis (LnMet) samples. Furthermore, we corroborated our findings using absolute real-time PCR (qPCR) on a panel of 12 primary normal human oral keratinocytes, five dysplasia and 10 HNSCC cell lines. Finally, we validated our study using bioinformatics microarray analysis on an independent HNSCC patient cohort (four normal and 16 tumours). In normal oral mucosa, CEP55 protein was detected at very low level within the upper differentiated layers. In contrast, CEP55 was highly expressed in oral dysplasia whereas only moderate expression was detected in HNSCC and LnMet. Low level of HELLS expression was detected in the basal cell layer of the normal oral mucosa, moderate level was seen in dysplasia and high levels in both HNSCC and LnMet. These expression patterns were consistent with both qPCR data from the cell line panel and microarray data analysis of TNM-stage defined HNSCC samples confirming the progressive expression pattern of CEP55 and HELLS. To our knowledge, this is the first pilot study demonstrating that both CEP55 and HELLS mRNA and protein expression positively correlate with pre-malignancy and HNSCC progression. This study provides strong evidence that CEP55 and HELLS may be used in conjunction with FOXM1 as a biomarker set for early cancer detection and indicators of malignant conversion and progression.
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Affiliation(s)
- Ahmad Waseem
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, England, United Kingdom
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Wang H, Teh MT, Ji Y, Patel V, Firouzabadian S, Patel AA, Gutkind JS, Yeudall WA. EPS8 upregulates FOXM1 expression, enhancing cell growth and motility. Carcinogenesis 2010; 31:1132-41. [PMID: 20351091 DOI: 10.1093/carcin/bgq058] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Previous studies from our laboratory have indicated that overexpression of the epidermal growth factor receptor pathway substrate 8 (EPS8) enhances cell proliferation, migration and tumorigenicity in vivo, although the mechanisms involved remain unexplored. A microarray screen to search for potential mediators of EPS8 identified upregulation of multiple cell cycle-related targets such as the transcription factor FOXM1 and several of its reported downstream mediators, including cdc20, cyclin B1, cyclin A, aurora-B kinase and cdc25C in cells with elevated EPS8, as well as matrix metalloproteinase-9, which we reported previously to be upregulated by EPS8-dependent mechanisms. Cells engineered to overexpress FOXM1 showed increased proliferation, similar to EPS8-overexpressing cells. Conversely, targeted knockdown of FOXM1 in EPS8-overexpressing cells reduced proliferation. Cotransfection of EPS8 with a FOXM1-luciferase reporter plasmid into 293-T- or SVpgC2a-immortalized buccal keratinocytes demonstrated that EPS8 enhances FOXM1 promoter activity, whereas chromatin immunoprecipitation assays revealed elevated levels of acetylated histone H3 associated with the FOXM1 promoter in cells expressing high levels of EPS8. Treatment of EPS8-overexpressing cells with inhibitors of phosphoinositide 3-OH kinase or AKT reduced expression of FOXM1 and aurora-B kinase, a transcriptional target of FOXM1. Overexpression of EPS8 induced expression of the chemokine ligands CXCL5 and CXCL12 in a FOXM1-dependent manner, which was blocked by LY294002 or a dominant-negative form of AKT. Additionally, overexpression of FOXM1 enhanced cell migration, whereas targeted knockdown of CXCL5 or inhibition of AKT reduced migration of EPS8-expressing cells. These data suggest that EPS8 enhances cell proliferation and migration in part by deregulating FOXM1 activity and inducing CXC-chemokine expression, mediated by PI3K- and AKT-dependent mechanisms.
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Affiliation(s)
- Huixin Wang
- Philips Institute of Oral and Craniofacial Molecular Biology, Virginia Commonwealth University, 521 N. 11th Street, Richmond, VA 23298-0566, USA
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Teh MT, Gemenetzidis E, Chaplin T, Young BD, Philpott MP. Upregulation of FOXM1 induces genomic instability in human epidermal keratinocytes. Mol Cancer 2010; 9:45. [PMID: 20187950 PMCID: PMC2907729 DOI: 10.1186/1476-4598-9-45] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Accepted: 02/26/2010] [Indexed: 12/24/2022] Open
Abstract
Background The human cell cycle transcription factor FOXM1 is known to play a key role in regulating timely mitotic progression and accurate chromosomal segregation during cell division. Deregulation of FOXM1 has been linked to a majority of human cancers. We previously showed that FOXM1 was upregulated in basal cell carcinoma and recently reported that upregulation of FOXM1 precedes malignancy in a number of solid human cancer types including oral, oesophagus, lung, breast, kidney, bladder and uterus. This indicates that upregulation of FOXM1 may be an early molecular signal required for aberrant cell cycle and cancer initiation. Results The present study investigated the putative early mechanism of UVB and FOXM1 in skin cancer initiation. We have demonstrated that UVB dose-dependently increased FOXM1 protein levels through protein stabilisation and accumulation rather than de novo mRNA expression in human epidermal keratinocytes. FOXM1 upregulation in primary human keratinocytes triggered pro-apoptotic/DNA-damage checkpoint response genes such as p21, p38 MAPK, p53 and PARP, however, without causing significant cell cycle arrest or cell death. Using a high-resolution Affymetrix genome-wide single nucleotide polymorphism (SNP) mapping technique, we provided the evidence that FOXM1 upregulation in epidermal keratinocytes is sufficient to induce genomic instability, in the form of loss of heterozygosity (LOH) and copy number variations (CNV). FOXM1-induced genomic instability was significantly enhanced and accumulated with increasing cell passage and this instability was increased even further upon exposure to UVB resulting in whole chromosomal gain (7p21.3-7q36.3) and segmental LOH (6q25.1-6q25.3). Conclusion We hypothesise that prolonged and repeated UVB exposure selects for skin cells bearing stable FOXM1 protein causes aberrant cell cycle checkpoint thereby allowing ectopic cell cycle entry and subsequent genomic instability. The aberrant upregulation of FOXM1 serves as a 'first hit' where cells acquire genomic instability which in turn predisposes cells to a 'second hit' whereby DNA-damage checkpoint response (eg. p53 or p16) is abolished to allow damaged cells to proliferate and accumulate genetic aberrations/mutations required for cancer initiation.
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Affiliation(s)
- Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK.
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Gemenetzidis E, Bose A, Riaz AM, Chaplin T, Young BD, Ali M, Sugden D, Thurlow JK, Cheong SC, Teo SH, Wan H, Waseem A, Parkinson EK, Fortune F, Teh MT. FOXM1 upregulation is an early event in human squamous cell carcinoma and it is enhanced by nicotine during malignant transformation. PLoS One 2009; 4:e4849. [PMID: 19287496 PMCID: PMC2654098 DOI: 10.1371/journal.pone.0004849] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Accepted: 02/16/2009] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Cancer associated with smoking and drinking remains a serious health problem worldwide. The survival of patients is very poor due to the lack of effective early biomarkers. FOXM1 overexpression is linked to the majority of human cancers but its mechanism remains unclear in head and neck squamous cell carcinoma (HNSCC). METHODOLOGY/PRINCIPAL FINDINGS FOXM1 mRNA and protein expressions were investigated in four independent cohorts (total 75 patients) consisting of normal, premalignant and HNSCC tissues and cells using quantitative PCR (qPCR), expression microarray, immunohistochemistry and immunocytochemistry. Effect of putative oral carcinogens on FOXM1 transcriptional activity was dose-dependently assayed and confirmed using a FOXM1-specific luciferase reporter system, qPCR, immunoblotting and short-hairpin RNA interference. Genome-wide single nucleotide polymorphism (SNP) array was used to 'trace' the genomic instability signature pattern in 8 clonal lines of FOXM1-induced malignant human oral keratinocytes. Furthermore, acute FOXM1 upregulation in primary oral keratinocytes directly induced genomic instability. We have shown for the first time that overexpression of FOXM1 precedes HNSCC malignancy. Screening putative carcinogens in human oral keratinocytes surprisingly showed that nicotine, which is not perceived to be a human carcinogen, directly induced FOXM1 mRNA, protein stabilisation and transcriptional activity at concentrations relevant to tobacco chewers. Importantly, nicotine also augmented FOXM1-induced transformation of human oral keratinocytes. A centrosomal protein CEP55 and a DNA helicase/putative stem cell marker HELLS, both located within a consensus loci (10q23), were found to be novel targets of FOXM1 and their expression correlated tightly with HNSCC progression. CONCLUSIONS/SIGNIFICANCE This study cautions the potential co-carcinogenic effect of nicotine in tobacco replacement therapies. We hypothesise that aberrant upregulation of FOXM1 may be inducing genomic instability through a program of malignant transformation involving the activation of CEP55 and HELLS which may facilitate aberrant mitosis and epigenetic modifications. Our finding that FOXM1 is upregulated early during oral cancer progression renders FOXM1 an attractive diagnostic biomarker for early cancer detection and its candidate mechanistic targets, CEP55 and HELLS, as indicators of malignant conversion and progression.
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Affiliation(s)
- Emilios Gemenetzidis
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Amrita Bose
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Adeel M. Riaz
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Tracy Chaplin
- Cancer Research UK Medical Oncology Laboratory, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Bryan D. Young
- Cancer Research UK Medical Oncology Laboratory, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Muhammad Ali
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - David Sugden
- Division of Reproduction and Endocrinology, School of Biomedical and Health Sciences, King's College London, London, United Kingdom
| | | | - Sok-Ching Cheong
- Cancer Research Initiatives Foundation (CARIF), 2nd Floor Outpatient Centre, Subang Jaya Medical Centre, Selangor, Malaysia
| | - Soo-Hwang Teo
- Cancer Research Initiatives Foundation (CARIF), 2nd Floor Outpatient Centre, Subang Jaya Medical Centre, Selangor, Malaysia
| | - Hong Wan
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Ahmad Waseem
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Eric K. Parkinson
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Farida Fortune
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Muy-Teck Teh
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
- * E-mail:
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Teh MT, Tilakaratne WM, Chaplin T, Young BD, Ariyawardana A, Pitiyage G, Lalli A, Stewart JE, Hagi-Pavli E, Cruchley A, Waseem A, Fortune F. Fingerprinting genomic instability in oral submucous fibrosis. J Oral Pathol Med 2008; 37:430-6. [PMID: 18284545 DOI: 10.1111/j.1600-0714.2008.00643.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Oral submucous fibrosis (OSF) is a high-risk pre-cancerous condition where 7-13% of these patients develop head and neck squamous cell carcinoma (HNSCC). To date there is no cancer predictive markers for OSF patients. Genomic instability hallmarks early genetic events during malignant transformation causing loss of heterozygosity (LOH) and chromosomal copy number abnormality. However, to date there is no study on genomic instability in OSF. Although this condition is known as a high-risk pre-cancerous condition, there is no data regarding the genomic status of this disease in terms of genetic susceptibility to malignant transformation. METHODS In this study, we investigated the existence of genetic signatures for carcinogenesis in OSF. We employed the high-resolution genome-wide Affymetrix Mapping single nucleotide polymorphism microarray technique to 'fingerprint' global genomic instability in the form of LOH in 15 patient-matched OSF-blood genomic DNA samples. RESULTS This rapid high-resolution mapping technique has revealed for the first time that a small number of discrete hot-spot LOH loci appeared in 47-53% of the OSF tissues studied. Many of these LOH loci were previously identified regions of genomic instability associated with carcinogenesis of the HNSCC. CONCLUSION To our knowledge, this is the first evidence that genomic instability in the form of LOH is present in OSF. We hypothesize that the genomic instability detected in OSF may play an important role in malignant transformation. Further functional association studies on these putative genes may reveal potential predictive oral cancer markers for OSF patients.
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Affiliation(s)
- M T Teh
- Centre for Clinical and Diagnostic Oral Sciences, Barts and The London School of Medicine and Dentistry, Institute of Cell and Molecular Sciences Building, Queen Mary, University of London, London, UK
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Lalli A, Tilakaratne WM, Ariyawardana A, Fitchett C, Leigh IM, Hagi-Pavli E, Cruchley AT, Parkinson EK, Teh MT, Fortune F, Waseem A. An altered keratinocyte phenotype in oral submucous fibrosis: correlation of keratin K17 expression with disease severity. J Oral Pathol Med 2008; 37:211-20. [DOI: 10.1111/j.1600-0714.2007.00609.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Tilakaratne WM, Iqbal Z, Teh MT, Ariyawardana A, Pitiyage G, Cruchley A, Stewart JE, Hagi-Pavli E, Lalli A, Waseem A, Parkinson EK, Fortune F. Upregulation of HIF-1alpha in malignant transformation of oral submucous fibrosis. J Oral Pathol Med 2008; 37:372-7. [PMID: 18221327 DOI: 10.1111/j.1600-0714.2007.00625.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Oral submucous fibrosis (OSF) is a precancerous condition showing extensive fibrosis of the submucosa and affects most parts of the oral cavity, including pharynx and upper third of the oesophagus. The molecules involved in the biological pathways of the fibrotic process appeared to be either down- or upregulated at different stages of the disease. Despite the precancerous nature, malignant transformation of the epithelium in the background of fibrosis has not been studied in detail. HIF-1alpha is a known transcription factor that is induced by hypoxia. AIMS To test the hypothesis that hypoxia plays a role in malignant transformation and progression of OSF. MATERIALS AND METHODS We used both formalin-fixed and frozen samples of OSF and normal mucosa to investigate the relationship between HIF-1alpha and epithelial dysplasia using immunohistochemistry and RT-PCR. CONCLUSIONS Our data indicate that HIF-1alpha is upregulated at both protein and mRNA levels in OSF and the correlation with epithelial dysplasia is statistically significant (P < 0.001). We propose that HIF-1alpha may play a role in malignant transformation of OSF. Further, over-expression of HIF-1alpha may contribute to the progression of fibrosis. It may be possible to use HIF-1alpha as a marker for malignant transformation of OSF.
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Affiliation(s)
- W M Tilakaratne
- Clinical and Diagnostic Oral Sciences, Queen Mary's School of Medicine and Dentistry, University of London, London, UK.
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Purdie KJ, Lambert SR, Teh MT, Chaplin T, Molloy G, Raghavan M, Kelsell DP, Leigh IM, Harwood CA, Proby CM, Young BD. Allelic imbalances and microdeletions affecting the PTPRD gene in cutaneous squamous cell carcinomas detected using single nucleotide polymorphism microarray analysis. Genes Chromosomes Cancer 2007; 46:661-9. [PMID: 17420988 PMCID: PMC2426828 DOI: 10.1002/gcc.20447] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Cutaneous squamous cell carcinomas (SCC) are the second most commonly diagnosed cancers in fair-skinned people; yet the genetic mechanisms involved in SCC tumorigenesis remain poorly understood. We have used single nucleotide polymorphism (SNP) microarray analysis to examine genome-wide allelic imbalance in 16 primary and 2 lymph node metastatic SCC using paired non-tumour samples to counteract normal copy number variation. The most common genetic change was loss of heterozygosity (LOH) on 9p, observed in 13 of 16 primary SCC. Other recurrent events included LOH on 3p (9 tumors), 2q, 8p, and 13 (each in 8 SCC) and allelic gain on 3q and 8q (each in 6 tumors). Copy number-neutral LOH was observed in a proportion of samples, implying that somatic recombination had led to acquired uniparental disomy, an event not previously demonstrated in SCC. As well as recurrent patterns of gross chromosomal changes, SNP microarray analysis revealed, in 2 primary SCC, a homozygous microdeletion on 9p23 within the protein tyrosine phosphatase receptor type D (PTPRD) locus, an emerging frequent target of homozygous deletion in lung cancer and neuroblastoma. A third sample was heterozygously deleted within this locus and PTPRD expression was aberrant. Two of the 3 primary SCC with PTPRD deletion had demonstrated metastatic potential. Our data identify PTPRD as a candidate tumor suppressor gene in cutaneous SCC with a possible association with metastasis.
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Affiliation(s)
- Karin J Purdie
- Cancer Research UK Skin Tumour Laboratory, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, London, England, UK.
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Faust R, Garratt PJ, Trujillo Pérez MA, Piccio VJD, Madsen C, Stenstrøm A, Frølund B, Davidson K, Teh MT, Sugden D. 7-Substituted-melatonin and 7-substituted-1-methylmelatonin analogues: Effect of substituents on potency and binding affinity. Bioorg Med Chem 2007; 15:4543-51. [PMID: 17459711 DOI: 10.1016/j.bmc.2007.04.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 03/29/2007] [Accepted: 04/05/2007] [Indexed: 12/15/2022]
Abstract
A series of 7-substituted melatonin and 1-methylmelatonin analogues were prepared and tested against human and amphibian melatonin receptors. 7-Substituents reduced the agonist potency of all the analogues in the Xenopus laevis melanophore assay, 7-bromomelatonin (5d) and N-butanoyl 7-bromo-5-methoxytryptamine (5f) being the most active compounds, but both were 42-fold less potent than melatonin (1). Whereas all the analogues bind with lower affinity at the human MT(1) receptor than melatonin, 5d, 5f and N-propanoyl 7-bromo-5-methoxytryptamine (5e) show a similar binding affinity to melatonin at the MT(2) receptor and consequently show some MT(2) selectivity. These results suggest that the receptor pocket around C-7 favours binding by an electronegative group, suggesting an electropositive region in this area of the receptor.
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Affiliation(s)
- Rüdiger Faust
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
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Teh MT, Blaydon D, Ghali LR, Briggs V, Edmunds S, Pantazi E, Barnes MR, Leigh IM, Kelsell DP, Philpott MP. Role for WNT16B in human epidermal keratinocyte proliferation and differentiation. J Cell Sci 2007. [DOI: 10.1242/jcs.03421] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Muy-Teck Teh
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
- Centre for Clinical and Diagnostic Oral Sciences, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Diana Blaydon
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Lucy R. Ghali
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Victoria Briggs
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Scott Edmunds
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Eleni Pantazi
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Michael R. Barnes
- Bioinformatics Discovery and Analysis, GlaxoSmithKline Pharmaceuticals, New Frontiers Science Park (North) Third Avenue, Harlow, CM19 5AW, UK
| | - Irene M. Leigh
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - David P. Kelsell
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
| | - Michael P. Philpott
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK
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Teh MT, Blaydon D, Ghali LR, Briggs V, Edmunds S, Pantazi E, Barnes MR, Leigh IM, Kelsell DP, Philpott MP. Role for WNT16B in human epidermal keratinocyte proliferation and differentiation. J Cell Sci 2007; 120:330-9. [PMID: 17200136 DOI: 10.1242/jcs.03329] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
WNT signalling regulates a variety of cell functions including cell fate, polarity, and differentiation via the canonical or beta-catenin stabilisation pathway and/or the planar cell polarity or non-canonical pathway. We have previously demonstrated that two isoforms (A and B) from the WNT16 locus have differential expression in various adult human tissues. In this study we show that WNT16B but not WNT16A isoform was upregulated in basal cell carcinomas compared with normal skin. We further investigated the cellular and molecular functions of WNT16B in primary human epidermal keratinocytes and a keratinocyte cell line. Cellular expression of WNT16B neither stabilised beta-catenin nor activated the lymphoid enhancer factor or T-cell factor transcriptional reporter in primary keratinocytes. WNT16B activated the Jun-N-terminal kinase cascade suggesting the activation of a non-canonical WNT signalling pathway. Constitutive expression of WNT16B significantly enhanced the rate of cell proliferation and prolonged clonogenicity in primary keratinocytes. Silencing WNT16B by RNA interference reduced keratinocyte proliferation. Furthermore, overexpression of WNT16B induced a hyperproliferation phenotype in an organotypical culture system. This work presents the first evidence that WNT16B activates human keratinocyte proliferation possibly via a beta-catenin-independent non-canonical WNT transduction pathway.
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Affiliation(s)
- Muy-Teck Teh
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and London School of Medicine and Dentistry, Queen Mary, University of London, Blizard Building, 4 Newark Street, London, E1 2AT, UK.
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Blaydon DC, Ishii Y, O'Toole EA, Unsworth HC, Teh MT, Rüschendorf F, Sinclair C, Hopsu-Havu VK, Tidman N, Moss C, Watson R, de Berker D, Wajid M, Christiano AM, Kelsell DP. The gene encoding R-spondin 4 (RSPO4), a secreted protein implicated in Wnt signaling, is mutated in inherited anonychia. Nat Genet 2006; 38:1245-7. [PMID: 17041604 DOI: 10.1038/ng1883] [Citation(s) in RCA: 145] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2006] [Accepted: 08/15/2006] [Indexed: 11/09/2022]
Abstract
Anonychia and hyponychia congenita (OMIM 206800) are rare autosomal recessive conditions in which the only presenting phenotype is the absence or severe hypoplasia of all fingernails and toenails. After determining linkage to chromosome 20p13, we identified homozygous or compound heterozygous mutations in the gene encoding R-spondin 4 (RSPO4), a secreted protein implicated in Wnt signaling, in eight affected families. Rspo4 expression was specifically localized to developing mouse nail mesenchyme at embryonic day 15.5, suggesting a crucial role in nail morphogenesis.
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Affiliation(s)
- Diana C Blaydon
- Centre for Cutaneous Research, Institute of Cell & Molecular Science, Queen Mary's School of Medicine and Dentistry, Queen Mary, University of London, Whitechapel, London E1 4AT, UK
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Tsotinis A, Vlachou M, Papahatjis DP, Calogeropoulou T, Nikas SP, Garratt PJ, Piccio V, Vonhoff S, Davidson K, Teh MT, Sugden D. Mapping the Melatonin Receptor. 7. Subtype Selective Ligands Based on β-SubstitutedN-Acyl-5-methoxytryptamines and β-SubstitutedN-Acyl-5-methoxy-1-methyltryptamines. J Med Chem 2006; 49:3509-19. [PMID: 16759094 DOI: 10.1021/jm0512544] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of beta-substituted and beta,beta-disubstituted N-acyl 5-methoxy-1-methyltryptamines and 5-methoxytryptamines have been prepared as melatonin analogues to investigate the nature of the binding site of the melatonin receptor. The affinity of analogues was determined in a radioligand binding assay using cloned human MT(1) and MT(2) receptor subtypes expressed in NIH 3T3 cells. Agonist and antagonist potency of all analogues was measured using the pigment aggregation response of a clonal line of Xenopus laevis melanophores. beta-Methylmelatonin (17a) and beta,beta-dimethylmelatonin (17b), though showing a slight decrease in binding at human receptors, show an increase in potency on Xenopus. N-Butanoyl 5-methoxy-1-methyl-beta,beta-trimethylenetryptamine (12c) is an antagonist at human MT(1) receptors but an agonist at MT(2), while N-butanoyl 5-methoxy-1-methyl-beta,beta-tetramethylenetryptamine (13c) is an antagonist at MT(1) but had no action at MT(2) and is one of the first examples of an MT(1) selective antagonist.
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Affiliation(s)
- Andrew Tsotinis
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Athens, Panepistimioupoli-Zografou, Athens 157 71, Greece.
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Teh MT, Blaydon D, Chaplin T, Foot NJ, Skoulakis S, Raghavan M, Harwood CA, Proby CM, Philpott MP, Young BD, Kelsell DP. Genomewide Single Nucleotide Polymorphism Microarray Mapping in Basal Cell Carcinomas Unveils Uniparental Disomy as a Key Somatic Event. Cancer Res 2005; 65:8597-603. [PMID: 16204023 DOI: 10.1158/0008-5472.can-05-0842] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Basal cell carcinoma is the most common human cancer with increasing incidence reported worldwide. Despite the aberrant signaling role of the Hedgehog pathway, little is known about the genetic mechanisms underlying basal cell carcinomas. Towards a better understanding of global genetic events, we have employed the Affymetrix Mapping 10K single nucleotide polymorphism (SNP) microarray technique for "fingerprinting" genomewide allelic imbalance in 14 basal cell carcinoma-blood pair samples. This rapid high-resolution SNP genotyping technique has revealed a somatic recombination event-uniparental disomy, leading to a loss of heterozygosity (LOH), as a key alternative genetic mechanism to allelic imbalances in basal cell carcinomas. A highly conserved LOH region at 9q21-q31 was found in 13 of 14 (93%) basal cell carcinomas. Further statistical and fluorescence in situ hybridization analyses confirmed that the 9q LOH was a result of uniparental disomy in 5 of 13 (38%) basal cell carcinomas. De novo mutations in the Patched 1 gene (PTCH) were found in 9 of 13 (69%) basal cell carcinomas with 9q LOH. A second important locus, containing LOH at 6q23-q27 was found in 5 of 14 (36%) basal cell carcinomas, suggesting that the presence of an additional putative tumor suppressor gene may be contributing to basal cell carcinoma development. This study shows that the rate of 9q LOH in basal cell carcinomas has been previously underestimated. Furthermore, we provide the first evidence that uniparental disomy due to somatic recombination constitutes one of the mechanisms of LOH in basal cell carcinoma tumorigenesis.
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Affiliation(s)
- Muy-Teck Teh
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, England, United Kingdom.
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Kelsell DP, Norgett EE, Unsworth H, Teh MT, Cullup T, Mein CA, Dopping-Hepenstal PJ, Dale BA, Tadini G, Fleckman P, Stephens KG, Sybert VP, Mallory SB, North BV, Witt DR, Sprecher E, Taylor AEM, Ilchyshyn A, Kennedy CT, Goodyear H, Moss C, Paige D, Harper JI, Young BD, Leigh IM, Eady RAJ, O'Toole EA. Mutations in ABCA12 underlie the severe congenital skin disease harlequin ichthyosis. Am J Hum Genet 2005; 76:794-803. [PMID: 15756637 PMCID: PMC1199369 DOI: 10.1086/429844] [Citation(s) in RCA: 227] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Accepted: 02/21/2005] [Indexed: 11/03/2022] Open
Abstract
Harlequin ichthyosis (HI) is the most severe and frequently lethal form of recessive congenital ichthyosis. Although defects in lipid transport, protein phosphatase activity, and differentiation have been described, the genetic basis underlying the clinical and cellular phenotypes of HI has yet to be determined. By use of single-nucleotide-polymorphism chip technology and homozygosity mapping, a common region of homozygosity was observed in five patients with HI in the chromosomal region 2q35. Sequencing of the ABCA12 gene, which maps within the minimal region defined by homozygosity mapping, revealed disease-associated mutations, including large intragenic deletions and frameshift deletions in 11 of the 12 screened individuals with HI. Since HI epidermis displays abnormal lamellar granule formation, ABCA12 may play a critical role in the formation of lamellar granules and the discharge of lipids into the intercellular spaces, which would explain the epidermal barrier defect seen in this disorder. This finding paves the way for early prenatal diagnosis. In addition, functional studies of ABCA12 will lead to a better understanding of epidermal differentiation and barrier formation.
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Affiliation(s)
- David P Kelsell
- Centre for Cutaneous Research, Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, London, United Kingdom.
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