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Chen Y, Zhang K, Zhang R, Wang Z, Yang L, Zhao T, Zhang S, Lin Y, Zhao H, Liu Y, Wei Y, Zhou Y, Zhang J, Ye X, Zhao J, Li X, Que J, Shi S, Liu K. Targeting the SOX2/CDP protein complex with a peptide suppresses the malignant progression of esophageal squamous cell carcinoma. Cell Death Discov 2023; 9:399. [PMID: 37891174 PMCID: PMC10611744 DOI: 10.1038/s41420-023-01693-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 09/28/2023] [Accepted: 10/16/2023] [Indexed: 10/29/2023] Open
Abstract
Emerging evidence indicates that SOX2 is an oncogene for esophageal squamous cell carcinoma (ESCC). However, direct targeting of SOX2 is not feasible given that this transcription factor plays important roles in the maintenance of tissues such as the brain. Here, we identified CDP (Homeobox protein cut-like 1 or CASP) as a unique SOX2 binding partner enriched in ESCC with Duolink proximity ligation assay, bimolecular fluorescence complementation (BiFc) and immunoprecipitation. We then screened a peptide aptamer library using BiFc and immunoprecipitation and identified several peptide aptamers, including P58, that blocked the CDP/SOX2 interaction, leading to the inhibition of ESCC progress in vitro and in vivo. Upon administration, synthetic peptide P58, containing the YGRKKRRQRRR cell-penetrating peptide and the fluorophore TAMRA, also blocked the growth and metastasis of ESCC in both mice and zebrafish. Therefore, targeting the SOX2 binding partner CDP with peptide P58 offers an alternative avenue to treat ESCC with increased SOX2 levels.
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Affiliation(s)
- Yunyun Chen
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Kun Zhang
- Department of General Surgery, Fuzhou First General Hospital affiliated with Fujian Medical University, Fuzhou, Fujian, 350009, P. R. China
| | - Rui Zhang
- Department of Laboratory Medicine, The Second Hospital of Fuzhou, Fuzhou, Fujian, 350007, P. R. China
| | - Zhuo Wang
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Liang Yang
- Westlake University, Hangzhou, Zhejiang, 310024, P. R. China
| | - Tingting Zhao
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Shihui Zhang
- Centre for Translational Stem Cell Biology, School of Biomedical Sciences, The University of Hong Kong, Pokfulam, Hong Kong SAR, 999077, P. R. China
| | - Yong Lin
- Science and Technology Service Center, Fujian Health College, Fuzhou, Fujian, 350101, P. R. China
| | - Hongzhou Zhao
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Yongpan Liu
- School of Life Science, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Yuxuan Wei
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Yijian Zhou
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Jiaying Zhang
- School of Life Science, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Xianzong Ye
- Department of Pathology, 900 Hospital of the Joint Logistics Team (Dongfang Hospital, Xiamen University), Fuzhou, Fujian, 350025, P. R. China
| | - Jing Zhao
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Xinxin Li
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China
| | - Jianwen Que
- Department of Medicine, Columbia University Medical Center, New York, NY, 10032, USA
| | - Songlin Shi
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China.
| | - Kuancan Liu
- Central Laboratory, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China.
- School of Medicine, Xiamen University, Xiamen, Fujian, 361102, P. R. China.
- School of Life Science, Nanchang Normal University, Nanchang, Jiangxi, 330032, P. R. China.
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Leyva-Díaz E. CUT homeobox genes: transcriptional regulation of neuronal specification and beyond. Front Cell Neurosci 2023; 17:1233830. [PMID: 37744879 PMCID: PMC10515288 DOI: 10.3389/fncel.2023.1233830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 08/23/2023] [Indexed: 09/26/2023] Open
Abstract
CUT homeobox genes represent a captivating gene class fulfilling critical functions in the development and maintenance of multiple cell types across a wide range of organisms. They belong to the larger group of homeobox genes, which encode transcription factors responsible for regulating gene expression patterns during development. CUT homeobox genes exhibit two distinct and conserved DNA binding domains, a homeodomain accompanied by one or more CUT domains. Numerous studies have shown the involvement of CUT homeobox genes in diverse developmental processes such as body axis formation, organogenesis, tissue patterning and neuronal specification. They govern these processes by exerting control over gene expression through their transcriptional regulatory activities, which they accomplish by a combination of classic and unconventional interactions with the DNA. Intriguingly, apart from their roles as transcriptional regulators, they also serve as accessory factors in DNA repair pathways through protein-protein interactions. They are highly conserved across species, highlighting their fundamental importance in developmental biology. Remarkably, evolutionary analysis has revealed that CUT homeobox genes have experienced an extraordinary degree of rearrangements and diversification compared to other classes of homeobox genes, including the emergence of a novel gene family in vertebrates. Investigating the functions and regulatory networks of CUT homeobox genes provides significant understanding into the molecular mechanisms underlying embryonic development and tissue homeostasis. Furthermore, aberrant expression or mutations in CUT homeobox genes have been associated with various human diseases, highlighting their relevance beyond developmental processes. This review will overview the well known roles of CUT homeobox genes in nervous system development, as well as their functions in other tissues across phylogeny.
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Leung RF, George AM, Roussel EM, Faux MC, Wigle JT, Eisenstat DD. Genetic Regulation of Vertebrate Forebrain Development by Homeobox Genes. Front Neurosci 2022; 16:843794. [PMID: 35546872 PMCID: PMC9081933 DOI: 10.3389/fnins.2022.843794] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/14/2022] [Indexed: 01/19/2023] Open
Abstract
Forebrain development in vertebrates is regulated by transcription factors encoded by homeobox, bHLH and forkhead gene families throughout the progressive and overlapping stages of neural induction and patterning, regional specification and generation of neurons and glia from central nervous system (CNS) progenitor cells. Moreover, cell fate decisions, differentiation and migration of these committed CNS progenitors are controlled by the gene regulatory networks that are regulated by various homeodomain-containing transcription factors, including but not limited to those of the Pax (paired), Nkx, Otx (orthodenticle), Gsx/Gsh (genetic screened), and Dlx (distal-less) homeobox gene families. This comprehensive review outlines the integral role of key homeobox transcription factors and their target genes on forebrain development, focused primarily on the telencephalon. Furthermore, links of these transcription factors to human diseases, such as neurodevelopmental disorders and brain tumors are provided.
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Affiliation(s)
- Ryan F. Leung
- Murdoch Children’s Research Institute, The Royal Children’s Hospital Melbourne, Parkville, VIC, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC, Australia
| | - Ankita M. George
- Murdoch Children’s Research Institute, The Royal Children’s Hospital Melbourne, Parkville, VIC, Australia
| | - Enola M. Roussel
- Murdoch Children’s Research Institute, The Royal Children’s Hospital Melbourne, Parkville, VIC, Australia
| | - Maree C. Faux
- Murdoch Children’s Research Institute, The Royal Children’s Hospital Melbourne, Parkville, VIC, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC, Australia
- Department of Surgery, Royal Melbourne Hospital, The University of Melbourne, Parkville, VIC, Australia
| | - Jeffrey T. Wigle
- Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB, Canada
| | - David D. Eisenstat
- Murdoch Children’s Research Institute, The Royal Children’s Hospital Melbourne, Parkville, VIC, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC, Australia
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
- Department of Pediatrics, University of Alberta, Edmonton, AB, Canada
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Liu N, Sun Q, Wan L, Wang X, Feng Y, Luo J, Wu H. CUX1, A Controversial Player in Tumor Development. Front Oncol 2020; 10:738. [PMID: 32547943 PMCID: PMC7272708 DOI: 10.3389/fonc.2020.00738] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 04/17/2020] [Indexed: 01/19/2023] Open
Abstract
CUX1 belongs to the homeodomain transcription factor family and is evolutionarily and functionally conserved from Drosophila to humans. In addition to the involvement in various physiological events including tissue development, cell proliferation, differentiation and migration, and DNA damage response, CUX1 has been implicated in tumorigenesis. Interestingly, CUX1 has been recently recognized as a haploinsufficient tumor suppressor, which is paradoxically overexpressed in tumor cells. While loss of heterozygosity and/or mutations of CUX1 have been frequently detected in many types of cancers, genomic amplification, and overexpression of CUX1 have also been reported in cancer tissues and are correlated with higher tumor grade and poor prognosis. Therefore, deciphering the roles of different CUX1 isoforms and in different tumor stages is required to establish a CUX1-based therapeutic strategy for cancer treatment.
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Affiliation(s)
- Ning Liu
- Department of Clinical Oncology, Taian City Central Hospital, Tai'an, China
| | - Qiliang Sun
- Department of Respiratory Medicine, Taian City Central Hospital, Tai'an, China
| | - Long Wan
- Department of Clinical Oncology, Taian City Central Hospital, Tai'an, China
| | - Xuan Wang
- Department of Liver Diseases, Central Laboratory, Institute of Clinical Immunology, ShuGuang Hospital Affiliated to Shanghai University of Chinese Traditional Medicine, Shanghai, China
| | - Yu Feng
- Department of General Surgery, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Judong Luo
- Department of Radiation Oncology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou, China
| | - Hailong Wu
- Shanghai University of Medicine & Health Sciences Affiliated Zhoupu Hospital, Shanghai, China.,Collaborative Innovation Center for Biomedicine, Shanghai University of Medicine & Health Sciences, Shanghai, China.,Shanghai Key Laboratory of Molecular Imaging, Shanghai University of Medicine & Health Sciences, Shanghai, China
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Dorris ER, O'Neill A, Treacy A, Klocker H, Teltsh O, Kay E, Watson RW. The transcription factor CUX1 negatively regulates invasion in castrate resistant prostate cancer. Oncotarget 2020; 11:846-857. [PMID: 32180898 PMCID: PMC7061738 DOI: 10.18632/oncotarget.27494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 01/29/2020] [Indexed: 12/15/2022] Open
Abstract
Metastatic prostate cancer is treated with androgen ablation therapy but progress to castrate resistant prostate cancer (CRPC). This study aimed to investigate the role of CUX1 in CRPC using clinical samples and in vitro models. CUX1 expression was increased in androgen-independent cells compared to androgen-sensitive cells. The multi-isoform nature of CUX1 makes it difficult to assay in tissue microarrays as there is no epitope able to distinguish the many isoforms for immunohistochemistry. Using surrogate markers, we found no differential expression between castrate resistant and local hormone naïve tissue. However, differences have been demonstrated at the transcript level. In androgen-sensitive cells, migration, but not invasion, increased following CUX1 knockdown. Conversely, in androgen-independent cells, invasion was increased. This observed difference in invasion capacity is not E-cadherin mediated, as CUX1 knockdown increases the expression of E-cadherin in both cell lines with no inter-cell line difference. Cells expressed different ratios of p110/p200 isoforms depending on androgen status and cathepsin L was only detectable in androgen-sensitive cells. MMP3 is upregulated in the androgen-independent cells. Rather than a simple presence or absence of CUX1, the relative balance of CUX1 isoforms and their interplay may be a significant factor in the functional role of CUX1 in CRPC.
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Affiliation(s)
- Emma R Dorris
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin, Ireland
| | - Amanda O'Neill
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin, Ireland
| | - Ann Treacy
- Pathology Department, Mater Private Hospital, Dublin, Ireland
| | - Helmut Klocker
- Department of Urology, Medical University of Innsbruck, Innsbruck, Austria
| | - Omri Teltsh
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin, Ireland
| | - Elaine Kay
- Department of Pathology, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland
| | - R William Watson
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin, Ireland
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6
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Transcription factor CUX1 is required for intestinal epithelial wound healing and targets the VAV2-RAC1 Signalling complex. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:2347-2355. [DOI: 10.1016/j.bbamcr.2017.09.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 09/05/2017] [Accepted: 09/06/2017] [Indexed: 01/02/2023]
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7
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Wang J, Wang Y, Sun D, Ren F, Pang S, Xu S. CUTL1 induces epithelial-mesenchymal transition in non-small cell lung cancer. Oncol Rep 2017; 37:3068-3074. [PMID: 28405678 DOI: 10.3892/or.2017.5571] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 03/07/2017] [Indexed: 11/06/2022] Open
Abstract
The homeobox transcription factor CUTL1 has been associated with cellular proliferation and cell cycle progression, and CUTL1 functions as an oncogene. The aim of the present study was to investigate whether CUTL1 participates in epithelial-mesenchymal transition (EMT). The expression levels of CUTL1, E-cadherin, N-cadherin and Snail were determined by immunohistochemistry assay, immunofluorescence assay or real-time quantitative reverse transcription PCR. Their roles in non-small cell lung cancer (NSCLC) were assessed by functional analyses. Protein expression was detected by western blot analysis. The CUTL1 expression levels are higher in non-small cell lung cancer (NSCLC) tissues. High CUTL1 expression in NSCLC is associated with the mesenchymal-like phenotype. Mechanistically, CUTL1 upregulates transforming growth factor β receptor I (TβR-I) expression, and the TβR-I inhibitor SB431542 abolishes EMT elicited by ectopic CUTL1 expression. Transforming growth factor β (TGF-β) signaling is essential for CUTL1-induced EMT in NSCLC cells. CUTL1 is downstream of TGF-β signaling and CUTL1 is involved in the expression of the TβR-I. This study indicates that CUTL1 may be a potential target for anti-lung cancer therapy.
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Affiliation(s)
- Junfeng Wang
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Yanbo Wang
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Dawei Sun
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Fenghai Ren
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Sainan Pang
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Shidong Xu
- Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
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Ramdzan ZM, Nepveu A. CUX1, a haploinsufficient tumour suppressor gene overexpressed in advanced cancers. Nat Rev Cancer 2014; 14:673-82. [PMID: 25190083 DOI: 10.1038/nrc3805] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
CUT-like homeobox 1 (CUX1) is a homeobox gene that is implicated in both tumour suppression and progression. The accumulated evidence supports a model of haploinsufficiency whereby reduced CUX1 expression promotes tumour development. Paradoxically, increased CUX1 expression is associated with tumour progression, and ectopic CUX1 expression in transgenic mice increases tumour burden in several tissues. One CUX1 isoform functions as an ancillary factor in base excision repair and the other CUX1 isoforms act as transcriptional activators or repressors. Several transcriptional targets and cellular functions of CUX1 affect tumorigenesis; however, we have yet to develop a mechanistic framework to reconcile the opposite roles of CUX1 in cancer protection and progression.
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Affiliation(s)
- Zubaidah M Ramdzan
- Goodman Cancer Centre, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada
| | - Alain Nepveu
- 1] Goodman Cancer Centre, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [2] Department of Biochemistry, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [3] Department of Medicine, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [4] Department of Oncology, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada
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9
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Krug S, Kühnemuth B, Griesmann H, Neesse A, Mühlberg L, Boch M, Kortenhaus J, Fendrich V, Wiese D, Sipos B, Friemel J, Gress TM, Michl P. CUX1: a modulator of tumour aggressiveness in pancreatic neuroendocrine neoplasms. Endocr Relat Cancer 2014; 21:879-90. [PMID: 25248790 DOI: 10.1530/erc-14-0152] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Pancreatic neuroendocrine neoplasms (PNENs) constitute a rare tumour entity, and prognosis and treatment options depend on tumour-mediating hallmarks such as angiogenesis, proliferation rate and resistance to apoptosis. The molecular pathways that determine the malignant phenotype are still insufficiently understood and this has limited the use of effective combination therapies in the past. In this study, we aimed to characterise the effect of the oncogenic transcription factor Cut homeobox 1 (CUX1) on proliferation, resistance to apoptosis and angiogenesis in murine and human PNENs. The expression and function of CUX1 were analysed using knockdown and overexpression strategies in Ins-1 and Bon-1 cells, xenograft models and a genetically engineered mouse model of insulinoma (RIP1Tag2). Regulation of angiogenesis was assessed using RNA profiling and functional tube-formation assays in HMEC-1 cells. Finally, CUX1 expression was assessed in a tissue microarray of 59 human insulinomas and correlated with clinicopathological data. CUX1 expression was upregulated during tumour progression in a time- and stage-dependent manner in the RIP1Tag2 model, and associated with pro-invasive and metastatic features of human insulinomas. Endogenous and recombinant CUX1 expression increased tumour cell proliferation, tumour growth, resistance to apoptosis, and angiogenesis in vitro and in vivo. Mechanistically, the pro-angiogenic effect of CUX1 was mediated via upregulation of effectors such as HIF1α and MMP9. CUX1 mediates an invasive pro-angiogenic phenotype and is associated with malignant behaviour in human insulinomas.
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Affiliation(s)
- Sebastian Krug
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Benjamin Kühnemuth
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Heidi Griesmann
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Albrecht Neesse
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Leonie Mühlberg
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Michael Boch
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Juliane Kortenhaus
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Volker Fendrich
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Dominik Wiese
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Bence Sipos
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Juliane Friemel
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Thomas M Gress
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
| | - Patrick Michl
- Departments of GastroenterologyEndocrinology and MetabolismSurgeryPhilipps-University Marburg, Baldingerstraße, 35043 Marburg, GermanyDepartment of PathologyEberhard-Karls-University Tübingen, Tübingen, GermanyDepartment of PathologyUniversity Hospital Zurich, Zurich, Switzerland
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Bian J, Li B, Zeng X, Hu H, Hong Y, Ouyang H, Zhang X, Wang Z, Zhu H, Lei P, Huang B, Shen G. Mutation of TGF-β receptor II facilitates human bladder cancer progression through altered TGF-β1 signaling pathway. Int J Oncol 2013; 43:1549-59. [PMID: 23970096 DOI: 10.3892/ijo.2013.2065] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 06/18/2013] [Indexed: 11/05/2022] Open
Abstract
Tumor cells commonly adapt survival strategies by downregulation or mutational inactivation of TGF-β receptors thereby reversing TGF-β1-mediated growth arrest. However, TGF-β1-triggered signaling also has a protumor effect through promotion of tumor cell migration. The mechanism(s) through which malignant cells reconcile this conflict by avoiding growth arrest, but strengthening migration remains largely unclear. TGF-βRII was overexpressed in the bladder cancer cell line T24, concomitant with point mutations, especially the Glu269 to Lys mutation (G → A). Whilst leaving Smad2/3 binding unaffected, TGF-βRII mutations resulted in the unaffected tumor cell growth and also enhanced cell mobility by TGF-β1 engagement. Such phenomena are perhaps partially explained by the mutated TGF-βRII pathway deregulating the p15 and Cdc25A genes that are important to cell proliferation and CUTL1 gene relevant to motility. On the other hand, transfecting recombinant TGF-βRII-Fc vectors or smad2/3 siRNA blocked such abnormal gene expressions. Clinically, such G → A mutations were also found in 18 patients (n=46) with bladder cancer. Comparing the clinical and pathologic characteristics, the pathologic T category (χ2 trend = 7.404, P<0.01) and tumor grade (χ2 trend = 9.127, P<0.01) tended to increase in the G → A mutated group (TGF-βRII point-mutated group). These findings provide new insights into how TGF-β1 signaling is tailored during tumorigenesis and new information into the current TGF-β1-based therapeutic strategies, especially in bladder cancer patient treatment.
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Affiliation(s)
- Jing Bian
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
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11
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Vadnais C, Awan AA, Harada R, Clermont PL, Leduy L, Bérubé G, Nepveu A. Long-range transcriptional regulation by the p110 CUX1 homeodomain protein on the ENCODE array. BMC Genomics 2013; 14:258. [PMID: 23590133 PMCID: PMC3770232 DOI: 10.1186/1471-2164-14-258] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 03/26/2013] [Indexed: 01/19/2023] Open
Abstract
Background Overexpression of the Cut homeobox 1 gene, CUX1, inversely
correlates with patient survival in breast cancers. Cell-based assays and
molecular studies have revealed that transcriptional regulation by
CUX1 involves mostly the proteolytically processed p110
isoform. As there is no antibody specific to p110 CUX1 only, an alternate
strategy must be employed to identify its targets. Results We expressed physiological levels of a tagged-p110 CUX1 protein and performed
chromatin affinity purification followed by hybridization on ENCODE and
promoter arrays. Targets were validated by chromatin immunoprecipitation and
transcriptional regulation by CUX1 was analyzed in expression profiling and
RT-qPCR assays following CUX1 knockdown or p110 CUX1 overexpression.
Approximately 47% and 14% of CUX1 binding sites were respectively mapped
less than 4 Kbp, or more than 40 Kbp, away from a transcription start site.
More genes exhibited changes in expression following CUX1 knockdown than
p110 CUX1 overexpression. CUX1 directly activated or repressed 7.4% and 8.4%
of putative targets identified on the ENCODE and promoter arrays
respectively. This proportion increased to 11.2% for targets with 2 binding
sites or more. Transcriptional repression was observed in a slightly higher
proportion of target genes. The CUX1 consensus binding motif, ATCRAT, was
found at 47.2% of the CUX1 binding sites, yet only 8.3% of the CUX1
consensus motifs present on the array were bound in vivo. The
presence of a consensus binding motif did not have an impact on whether a
target gene was repressed or activated. Interestingly, the distance between
a binding site and a transcription start site did not significantly reduced
the ability of CUX1 to regulate a target gene. Moreover, CUX1 not only was
able to regulate the next adjacent gene, but also regulated the gene located
beyond this one as well as the gene located further away in the opposite
direction. Conclusion Our results demonstrate that p110 CUX1 can activate or repress transcription
when bound at a distance and can regulate more than one gene on certain
genomic loci.
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Affiliation(s)
- Charles Vadnais
- Goodman Cancer Centre, McGill University, 1160 Pine avenue West, Montreal, Quebec H3A 1A3, Canada
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12
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Liu KC, Lin BS, Zhao M, Wang KY, Lan XP. Cutl1: a potential target for cancer therapy. Cell Signal 2012; 25:349-54. [PMID: 23085261 DOI: 10.1016/j.cellsig.2012.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 10/12/2012] [Accepted: 10/12/2012] [Indexed: 01/19/2023]
Abstract
CDP, a key transcription regulator encoded by Cutl1 gene, has been demonstrated to be involved in repressing or promoting expression of target genes through its specific DNA-binding, meanwhile, the activity of CDP was influenced by some types of modifications including transcriptional, posttranscriptional, translational and posttranslational modifications. In this review, we systematically analyzed the role of CDP in normal development and tumor progression, and then emphasized its interactors and downstream molecules. Eventually, we concluded that Cut1 could promote cancer progression and its down-regulating expression will be a promising strategy for cancer therapy.
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Affiliation(s)
- Kuan-can Liu
- Institute for Laboratory Medicine, Fuzhou General Hospital, PLA, Fuzhou, Fujian 350025, PR China
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13
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Hulea L, Nepveu A. CUX1 transcription factors: from biochemical activities and cell-based assays to mouse models and human diseases. Gene 2012; 497:18-26. [PMID: 22306263 DOI: 10.1016/j.gene.2012.01.039] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 01/09/2012] [Accepted: 01/18/2012] [Indexed: 01/19/2023]
Abstract
ChIP-chip and expression analyses indicated that CUX1 transcription factors regulate a large number of genes and microRNAs involved in multiple cellular processes. Indeed, in proliferating cells CUX1 was shown to regulate several genes involved in DNA replication, progression into S phase and later, the spindle assembly checkpoint that controls progression through mitosis. siRNA-mediated knockdown established that CUX1 is required for cell motility. Moreover, higher expression of short CUX1 isoforms, as observed in many cancers, was shown to stimulate cell migration and invasion. In parallel, elevated expression particularly in higher grade tumors of breast and pancreatic cancers implicated CUX1 in tumor initiation and progression. Indeed, transgenic mouse models demonstrated a causal role of CUX1 in cancers originating from various cell types. These studies revealed that higher CUX1 expression or activity not only stimulates cell proliferation and motility, but also promotes genetic instability. CUX1 has also been implicated in the etiology of polycystic kidney diseases, both from a transgenic approach and the analysis of CUX1 activity in multiple mouse models of this disease. Studies in neurobiology have uncovered a potential implication of CUX1 in cognitive disorders, neurodegeneration and obesity. CUX1 was shown to be expressed specifically in pyramidal neurons of the neocortex upper layers where it regulates dendrite branching, spine development, and synapse formation. In addition, modulation of CUX1 expression in neurons of the hypothalamus has been associated with changes in leptin receptor trafficking in the vicinity of the primary cilium resulting in altered leptin signaling and ultimately, eating behavior. Overall, studies in various fields have allowed the development of several cell-based assays to monitor CUX1 function and have extended the range of organs in which CUX1 plays an important role in development and tissue homeostasis.
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Affiliation(s)
- Laura Hulea
- Goodman Cancer Centre, McGill University, 1160 Pine avenue West, Montreal, Quebec, Canada H3A 1A3
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14
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Sansregret L, Nepveu A. Gene signatures of genomic instability as prognostic tools for breast cancer. Future Oncol 2011; 7:591-4. [PMID: 21568672 DOI: 10.2217/fon.11.34] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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15
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Kojima K, Takata A, Vadnais C, Otsuka M, Yoshikawa T, Akanuma M, Kondo Y, Kang YJ, Kishikawa T, Kato N, Xie Z, Zhang WJ, Yoshida H, Omata M, Nepveu A, Koike K. MicroRNA122 is a key regulator of α-fetoprotein expression and influences the aggressiveness of hepatocellular carcinoma. Nat Commun 2011; 2:338. [PMID: 21654638 DOI: 10.1038/ncomms1345] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 05/11/2011] [Indexed: 12/18/2022] Open
Abstract
α-fetoprotein (AFP) is not only a widely used biomarker in hepatocellular carcinoma (HCC) surveillance, but is also clinically recognized as linked with aggressive tumour behaviour. Here we show that deregulation of microRNA122, a liver-specific microRNA, is a cause of both AFP elevation and a more biologically aggressive phenotype in HCC. We identify CUX1, a direct target of microRNA122, as a common central mediator of these two effects. Using liver tissues from transgenic mice in which microRNA122 is functionally silenced, an orthotopic xenograft tumour model, and human clinical samples, we further demonstrate that a microRNA122/CUX1/microRNA214/ZBTB20 pathway regulates AFP expression. We also show that the microRNA122/CUX1/RhoA pathway regulates the aggressive characteristics of tumours. We conclude that microRNA122 and associated signalling proteins may represent viable therapeutic targets, and that serum AFP levels in HCC patients may be a surrogate marker for deregulated intracellular microRNA122 signalling pathways in HCC tissues.
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Affiliation(s)
- Kentaro Kojima
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
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16
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Paul BM, Vassmer D, Taylor A, Magenheimer L, Carlton CG, Piontek KB, Germino GG, Vanden Heuvel GB. Ectopic expression of Cux1 is associated with reduced p27 expression and increased apoptosis during late stage cyst progression upon inactivation of Pkd1 in collecting ducts. Dev Dyn 2011; 240:1493-501. [PMID: 21465620 DOI: 10.1002/dvdy.22625] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2011] [Indexed: 01/18/2023] Open
Abstract
Polycystic kidney diseases (PKD) are inherited disorders characterized by fluid-filled cysts primarily in the kidneys. We previously reported differences between the expression of Cux1, p21, and p27 in the cpk and Pkd1 null mouse models of PKD. Embryonic lethality of Pkd1 null mice limits its study to early stages of kidney development. Therefore, we examined mice with a collecting duct specific deletion in the Pkd1 gene. Cux1 was ectopically expressed in the cyst lining epithelial cells of newborn, P7 and P15 Pkd1(CD) mice. Cux1 expression correlated with cell proliferation in early stages of cystogenesis, however, as the disease progressed, fewer cyst lining cells showed increased cell proliferation. Rather, Cux1 expression in late stage cystogenesis was associated with increased apoptosis. Taken together, our results suggest that increased Cux1 expression associated with apoptosis is a common feature of late stage cyst progression in both the cpk and Pkd1(CD) mouse models of PKD.
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Affiliation(s)
- Binu M Paul
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, Kansas 66160, USA
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17
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Glutamate receptor GRIA3--target of CUX1 and mediator of tumor progression in pancreatic cancer. Neoplasia 2010; 12:659-67. [PMID: 20689760 DOI: 10.1593/neo.10486] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 05/24/2010] [Accepted: 05/27/2010] [Indexed: 02/07/2023] Open
Abstract
Previously, we identified the transcription factor CUX1 as an important modulator of invasion and resistance to apoptosis. Expression profiles suggested that CUX1 regulates a complex transcriptional program mediating tumor progression. We aimed to identify functionally relevant targets of CUX1 by using RNA interference (RNAi)-based loss-of-function screens. Therefore, we generated an RNAi library containing putative transcriptional targets of CUX1 identified by microarrays and performed cell viability screens. Using this approach, several CUX1 targets with effect on tumor cell viability were identified, including the glutamate receptor GRIA3, which was validated in detail for its effects on proliferation, apoptosis, and cell migration using RNAi knock-down and overexpression strategies in vitro, as well as xenograft models in vivo. The expression of GRIA3 was evaluated in human pancreatic cancer tissues. We found that knock-down of GRIA3 significantly reduced proliferation and migration and enhanced apoptosis. In contrast, overexpression of GRIA3 significantly reduced apoptosis and enhanced both proliferation and tumor cell migration. GRIA3 could be confirmed as a downstream effector of CUX1 and was expressed in pancreatic cancer tissues. In vivo, GRIA3 significantly enhanced the growth of subcutaneous xenografts. Inhibitors of glutamate receptors such as GYKI52466 and SYM2206 significantly decreased survival of pancreatic cancer cells, suggesting the presence of glutamate signaling in pancreatic cancer. In conclusion, GRIA3 plays a role as a mediator of tumor progression in pancreatic cancer downstream CUX1. To our knowledge, this is the first report to identify a glutamate receptor as a modulator of tumor progression in a solid cancer outside the brain.
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18
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Kroll MR, Viss ES, Lamb J, Horstman J, Powell A, Van Wyk A, Hinkkala K, Hoogland T, Schippers M, Shannon S, Carlton CG, Sharma M, Taylor A, Vanden Heuvel GB, Jelsma TN. Asynchronous expression of the homeodomain protein CUX1 in Sertoli cells and spermatids during spermatogenesis in mice. Biol Reprod 2010; 84:455-65. [PMID: 20980687 DOI: 10.1095/biolreprod.110.084335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The homeodomain CUX1 protein exists as multiple isoforms that arise from proteolytic processing of a 200-kDa protein or an alternate splicing or from the use of an alternate promoter. The 200-kDa CUX1 protein is highly expressed in the developing kidney, where it functions to regulate cell proliferation. Transgenic mice ectopically expressing the 200-kDa CUX1 protein develop renal hyperplasia associated with reduced expression of the cyclin kinase inhibitor p27. A 55-kDa CUX1 isoform is expressed exclusively in the testes. We determined the pattern and timing of CUX1 protein expression in developing testes. CUX1 expression was continuous in Sertoli cells from prepubertal testes but became cyclic when spermatids appeared. In testes from mature mice, CUX1 was highly expressed only in round spermatids at stages IV-V of spermatogenesis, in both spermatids and Sertoli cells at stages VI-X of spermatogenesis, and only in Sertoli cells at stage XI of spermatogenesis. While most of the seminiferous tubules in wild-type mice were between stages VI and X of spermatogenesis, there was a significant reduction in the percentage of seminiferous tubules between stages VI and X in Cux1 transgenic mice and a significant increase in the percentage of seminiferous tubules in stages IV-V and XI. Moreover, CUX1 was not expressed in proliferating cells in testes from either wild-type or transgenic mice. Thus, unlike the somatic form of CUX1, which has a role in cell proliferation, the testis-specific form of CUX1 is not involved in cell division and appears to play a role in signaling between Sertoli cells and spermatids.
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Affiliation(s)
- Melissa R Kroll
- Department of Biology, Dordt College, Sioux Center, Iowa, USA
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19
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Kedinger V, Nepveu A. The roles of CUX1 homeodomain proteins in the establishment of a transcriptional program required for cell migration and invasion. Cell Adh Migr 2010; 4:348-52. [PMID: 20224295 DOI: 10.4161/cam.4.3.11407] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The Cut homeobox gene 1 (CUX1) codes for several homeodomain proteins that display distinct DNA binding and transcriptional properties. Some CUX1 isoforms were previously shown to stimulate entry into S phase. More recently, siRNA-mediated knockdown of CUX1 was shown to cause a decrease in cell migration and invasion. In contrast, ectopic expression of p110 or p75 CUX1 stimulated cell migration and invasion in tissue culture. Moreover, metastasis to the lung was observed in a few cases following development of mammary tumors in p75 CUX1 transgenic mice. Chromatin immunoprecipitation (ChIP) assays followed by hybridization on promoter arrays (ChIP-chip) led to the identification of more than 20 genes that are directly regulated by CUX1 and code for proteins involved in cytoskeleton remodeling, cell-cell and cell-matrix adhesion, epithelial to mesenchymal transition and transcriptional regulation. Many targets of CUX1 are regulators of Rho GTPases that play a role both in cell cycle progression and cell motility. Interestingly, some genes that promote cell motility are activated by CUX1, while some genes that inhibit cell motility are repressed by CUX1. The dual function of CUX1 as an activator and repressor is best exemplified by the regulatory cascade whereby CUX1 activates expression of the Snail and Slug transcription factors and then cooperates with them to repress the E-cadherin and occludin genes, thereby causing a severe disorganization of cell-cell junctions. Together, these studies indicate that CUX1 stimulates cell motility by regulating a large number of genes involved in various molecular functions.
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20
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Kedinger V, Sansregret L, Harada R, Vadnais C, Cadieux C, Fathers K, Park M, Nepveu A. p110 CUX1 homeodomain protein stimulates cell migration and invasion in part through a regulatory cascade culminating in the repression of E-cadherin and occludin. J Biol Chem 2009; 284:27701-11. [PMID: 19635798 DOI: 10.1074/jbc.m109.031849] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
In this study, we investigated the mechanism by which the CUX1 transcription factor can stimulate cell migration and invasion. The full-length p200 CUX1 had a weaker effect than the proteolytically processed p110 isoform; moreover, treatments that affect processing similarly impacted cell migration. We conclude that the stimulatory effect of p200 CUX1 is mediated in part, if not entirely, through the generation of p110 CUX1. We established a list of putative transcriptional targets with functions related to cell motility, and we then identified those targets whose expression was directly regulated by CUX1 in a cell line whose migratory potential was strongly stimulated by CUX1. We identified 18 genes whose expression was directly modulated by p110 CUX1, and its binding to all target promoters was validated in independent chromatin immunoprecipitation assays. These genes code for regulators of Rho-GTPases, cell-cell and cell-matrix adhesion proteins, cytoskeleton-associated proteins, and markers of epithelial-to-mesenchymal transition. Interestingly, p110 CUX1 activated the expression of genes that promote cell motility and at the same time repressed genes that inhibit this process. Therefore, the role of p110 CUX1 in cell motility involves its functions in both activation and repression of transcription. This was best exemplified in the regulation of the E-cadherin gene. Indeed, we uncovered a regulatory cascade whereby p110 CUX1 binds to the snail and slug gene promoters, activates their expression, and then cooperates with these transcription factors in the repression of the E-cadherin gene, thereby causing disorganization of cell-cell junctions.
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Affiliation(s)
- Valerie Kedinger
- McGill University Cancer Pavilion, McGill University, Montreal, Quebec H3A 1A3, Canada
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21
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Sansregret L, Nepveu A. The multiple roles of CUX1: insights from mouse models and cell-based assays. Gene 2008; 412:84-94. [PMID: 18313863 DOI: 10.1016/j.gene.2008.01.017] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2007] [Revised: 01/18/2008] [Accepted: 01/21/2008] [Indexed: 01/19/2023]
Abstract
Cux (Cut homeobox) genes are present in all metazoans. Early reports described many phenotypes caused by cut mutations in Drosophila melanogaster. In vertebrates, CUX1 was originally characterized as the CCAAT-displacement protein (CDP). Another line of investigation revealed the presence of CUX1 within a multi-protein complex called the histone nuclear factor D (HiNF-D). Recent studies led to the identification of several CUX1 isoforms with distinct DNA binding and transcriptional properties. While the CCAAT-displacement activity was implicated in the transcriptional repression of several genes, some CUX1 isoforms were found to participate in the transcriptional activation of some genes. The expression and activity of CUX1 was shown to be regulated through the cell cycle and to be a target of TGF-beta signaling. Mechanisms of regulation include alternative transcription initiation, proteolytic processing, phosphorylation and acetylation. Cell-based assays have established a role for CUX1 in the control of cell cycle progression, cell motility and invasion. In the mouse, gene inactivation as well as over-expression in transgenic mice has revealed phenotypes in multiple organs and cell types. While some phenotypes could be explained by the presumed functions of CUX1 in the affected cells, other phenotypes invoked non-cell-autonomous effects that suggest regulatory functions with an impact on cell-cell interactions. The implication of CUX1 in cancer was suggested first from its over-expression in primary tumors and cancer cell lines and was later confirmed in mouse models.
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