1
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Wang M, Zhong L, Zhang H, Wan P, Chu X, Shao X, Chen S, Zhou Z, Yu L, Liu B. p200CUX1-regulated BMP8B inhibits the progression of acute myeloid leukemia via the MAPK signaling pathway. Med Oncol 2024; 41:166. [PMID: 38819709 DOI: 10.1007/s12032-024-02398-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Accepted: 04/25/2024] [Indexed: 06/01/2024]
Abstract
The full-length p200CUX1 protein encoded by the homology frame CUT-like protein (CUX1) plays an important role in tumors as a pro-oncogene or oncogene. However, its role and mechanism in acute myeloid leukemia remain unknown. p200CUX1 regulates several pathways, including the MAPK signaling pathway. Our data showed that p200CUX1 is lowly expressed in THP1 and U937 AML cell lines. Lentiviral overexpression of p200CUX1 reduced proliferation and promoted apoptosis and G0/G1 phase blockade, correlating with MAPK pathway suppression. Additionally, p200CUX1 regulated the expression of bone morphogenetic protein 8B (BMP8B), which is overexpressed in AML. Overexpression of p200CUX1 downregulated BMP8B expression and inhibited the MAPK pathway. Furthermore, BMP8B knockdown inhibited AML cell proliferation, enhanced apoptosis and the sensitivity of ATRA-induced cell differentiation, and blocked G0/G1 transition. Our findings demonstrate the pivotal function of the p200CUX1-BMP8B-MAPK axis in maintaining the viability of AML cells. Consequently, targeting p200CUX1 could represent a viable strategy in AML therapy.
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Affiliation(s)
- Meng Wang
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Liang Zhong
- Key Laboratory of Laboratory Medical Diagnostics, Ministry of Education, Department of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China
| | - Hongyan Zhang
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Peng Wan
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Xuan Chu
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Xin Shao
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Shuyu Chen
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Ziwei Zhou
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China
| | - Lihua Yu
- Clinical Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China.
| | - Beizhong Liu
- Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing, 402160, China.
- Key Laboratory of Laboratory Medical Diagnostics, Ministry of Education, Department of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China.
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2
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Wang Q, Bode AM, Zhang T. Targeting CDK1 in cancer: mechanisms and implications. NPJ Precis Oncol 2023; 7:58. [PMID: 37311884 DOI: 10.1038/s41698-023-00407-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/25/2023] [Indexed: 06/15/2023] Open
Abstract
Cyclin dependent kinases (CDKs) are serine/threonine kinases that are proposed as promising candidate targets for cancer treatment. These proteins complexed with cyclins play a critical role in cell cycle progression. Most CDKs demonstrate substantially higher expression in cancer tissues compared with normal tissues and, according to the TCGA database, correlate with survival rate in multiple cancer types. Deregulation of CDK1 has been shown to be closely associated with tumorigenesis. CDK1 activation plays a critical role in a wide range of cancer types; and CDK1 phosphorylation of its many substrates greatly influences their function in tumorigenesis. Enrichment of CDK1 interacting proteins with Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis was conducted to demonstrate that the associated proteins participate in multiple oncogenic pathways. This abundance of evidence clearly supports CDK1 as a promising target for cancer therapy. A number of small molecules targeting CDK1 or multiple CDKs have been developed and evaluated in preclinical studies. Notably, some of these small molecules have also been subjected to human clinical trials. This review evaluates the mechanisms and implications of targeting CDK1 in tumorigenesis and cancer therapy.
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Affiliation(s)
- Qiushi Wang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA
| | - Ann M Bode
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA.
| | - Tianshun Zhang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN, 55912, USA.
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3
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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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4
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Feng F, Zhao Z, Zhou Y, Cheng Y, Wu X, Heng X. CUX1 Facilitates the Development of Oncogenic Properties Via Activating Wnt/β-Catenin Signaling Pathway in Glioma. Front Mol Biosci 2021; 8:705008. [PMID: 34422906 PMCID: PMC8377541 DOI: 10.3389/fmolb.2021.705008] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/26/2021] [Indexed: 11/30/2022] Open
Abstract
Background: Homeobox cut like 1 (CUX1), which often presents aberrated expression in many cancer cells, exerts a crucial role in tumorigenesis. Evidence describing CUX1 in gliomagenesis is scarce, and the effects of CUX1 on the Wnt/β-catenin pathway have not been reported. Our study aimed to explore the biological functions and molecular mechanisms involved in CUX1 activity in glioma. Methods: Datasets for bioinformatics analysis were obtained from the GEO, TCGA, CGGA, GTEX and CCLE databases. qRT-PCR, western blotting (WB), and immunohistochemistry (IHC) assays were used to investigate the expression patterns of CUX1 among glioma and brain tissues. CUX1 knockdown and overexpression vectors were transfected into glioma cell lines, the CCK-8, clone formation assay, wound healing, Transwell assay, and flow cytometry were performed to detect changes in cell viability, invasiveness, and the cell cycle. WB and immunofluorescence (IF) assays were used to explore changes in cell cycle-related and Wnt/β-catenin signaling protein levels. Results: Overexpression of CUX1 was identified in glioma tissues, and especially in glioblastoma (GBM), when compared to normal controls and correlated with poor prognosis. In comparison with untreated cells, TJ905 glioma cells overexpressing CUX1 showed higher proliferation and invasion abilities and S phase cell-cycle arrest, while the knockdown of CUX1 suppressed cell invasive ability and induced G1 phase arrest. Active Wnt/β-catenin signaling was enriched and clustered in a CUX1-associated GSEA/GSVA analysis. IF and WB assays indicated that CUX1 regulated the distribution of Axin2/β-catenin in glioma cells and regulated the expression of proteins downstream of the Wnt/β-catenin signaling pathway, suggesting that CUX1 served as an upstream positive regulator of the Wnt/β-catenin pathway. Finally, the knockdown of Axin2 or β-catenin could reverse the tumor-promoting effects caused by CUX1 overexpression, suggesting that CUX1 induced gliomagenesis and malignant phenotype by activating the Wnt/β-catenin signaling pathway. Conclusion: Our data suggested that the transcription factor CUX1 could be a novel therapeutic target for glioma with gene therapy.
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Affiliation(s)
- Fan Feng
- Institute of Clinical Medicine College, Guangzhou University of Chinese Medicine, Guangzhou, China.,Institute of Brain Science and Brain-Like Intelligence, Linyi People's Hospital, Linyi, China.,Department of Neurosurgery, Linyi People's Hospital, Linyi, China
| | - Zongqing Zhao
- Institute of Brain Science and Brain-Like Intelligence, Linyi People's Hospital, Linyi, China.,Department of Neurosurgery, Linyi People's Hospital, Linyi, China
| | - Yunfei Zhou
- Department of Neurosurgery, Linyi People's Hospital, Linyi, China
| | - Yanhao Cheng
- Institute of Brain Science and Brain-Like Intelligence, Linyi People's Hospital, Linyi, China.,Department of Neurosurgery, Linyi People's Hospital, Linyi, China
| | - Xiujie Wu
- Institute of Brain Science and Brain-Like Intelligence, Linyi People's Hospital, Linyi, China.,Department of Neurosurgery, Linyi People's Hospital, Linyi, China
| | - Xueyuan Heng
- Institute of Brain Science and Brain-Like Intelligence, Linyi People's Hospital, Linyi, China.,Department of Neurosurgery, Linyi People's Hospital, Linyi, China
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5
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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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6
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Wu X, Feng F, Yang C, Zhang M, Cheng Y, Zhao Y, Wang Y, Che F, Zhang J, Heng X. Upregulated Expression of CUX1 Correlates with Poor Prognosis in Glioma Patients: a Bioinformatic Analysis. J Mol Neurosci 2019; 69:527-537. [PMID: 31377983 DOI: 10.1007/s12031-019-01355-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 03/21/2019] [Indexed: 01/06/2023]
Abstract
Cut-like homeobox-1 (CUX1) is expressed in the upper layer of the cortex and participates in DNA replication, cell cycle control, and DNA repair. It has been shown to be involved in the proliferation of various types of solid tumors. The aims of this study were to explore the relationship between CUX1 expression and the prognosis of glioma by performing a series of functional experiments and bioinformatic analyses. Firstly, we found that CUX1 expression levels differed among patients with different grades of gliomas, and they were significantly correlated with the prognosis of glioma patients according to an analysis of data from a public database. qRT-PCR, western blotting, and immunohistochemical analysis of CUX1 were performed to demonstrate that the expression of CUX1 was positively correlated with the glioma WHO grade (P < 0.05) and several malignant clinical pathological parameters, including Ki67 and P53mut. In addition, the multivariate Cox regression and Kaplan-Meier curves showed that CUX1 expression exerted predictive value for overall survival. Finally, to further investigate the functions of CUX1, we identified CUX1-associated genes and, though GO/KEGG analysis, their associated biological functions and signaling pathways; the results suggested that the activity of CUX1 might be exerted via the JAK-STAT pathway or other key regulators of the cell cycle to promote proliferation, inflammation, and chemotherapy resistance in glioma. Taken together, these results indicate that CUX1 is a potential biomarker of malignancy and prognosis and may serve as a potential therapeutic target for glioma patients.
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Affiliation(s)
- Xiujie Wu
- Department of Neurosurgery, Linyi People's Hospital, Linyi, 276000, Shandong Province, People's Republic of China
| | - Fan Feng
- Department of Neurosurgery, Qingdao University, Qingdao, 266071, Shandong Province, People's Republic of China
| | - Chuanchao Yang
- Department of Neurosurgery, Weifang Medical University, Weifang, 261042, Shandong Province, People's Republic of China
| | - Moxuan Zhang
- Department of Neurosurgery, Weifang Medical University, Weifang, 261042, Shandong Province, People's Republic of China
| | - Yanhao Cheng
- Department of Neurosurgery, Linyi People's Hospital, Linyi, 276000, Shandong Province, People's Republic of China
| | - Yayun Zhao
- Department of Neurosurgery, Taishan Medical University, Taian, 271000, Shandong Province, People's Republic of China
| | - Yayu Wang
- Department of Neurosurgery, Binzhou Medical University, Binzhou, 256603, Shandong Province, People's Republic of China
| | - Fengyuan Che
- Department of Neurosurgery, Linyi People's Hospital, Linyi, 276000, Shandong Province, People's Republic of China
| | - Jian Zhang
- Department of Neurosurgery, Linyi People's Hospital, Linyi, 276000, Shandong Province, People's Republic of China.
| | - Xueyuan Heng
- Department of Neurosurgery, Linyi People's Hospital, Linyi, 276000, Shandong Province, People's Republic of China.
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7
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Abstract
Cux1 and Cux2 are the vertebrate members of a family of homeodomain transcription factors (TF) containing Cut repeat DNA-binding sequences. Perturbation of their expression has been implicated in a wide variety of diseases and disorders, ranging from cancer to autism spectrum disorder (ASD). Within the nervous system, both genes are expressed during neurogenesis and in specific neuronal subpopulations. Their role during development and circuit specification is discussed here, with a particular focus on the cortex where their restricted expression in pyramidal neurons of the upper layers appears to be responsible for many of the specialized functions of these cells, and where their functions have been extensively investigated. Finally, we discuss how Cux TF represent a promising avenue for manipulating neuronal function and for reprogramming.
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8
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Abstract
The final stage of cell division (mitosis), involves the compaction of the duplicated genome into chromatid pairs. Each pair is captured by microtubules emanating from opposite spindle poles, aligned at the metaphase plate, and then faithfully segregated to form two identical daughter cells. Chromatids that are not correctly attached to the spindle are detected by the constitutively active spindle assembly checkpoint (SAC). Any stress that prevents correct bipolar spindle attachment, blocks the satisfaction of the SAC, and induces a prolonged mitotic arrest, providing the cell time to obtain attachment and complete segregation correctly. Unfortunately, during mitosis repairing damage is not generally possible due to the compaction of DNA into chromosomes, and subsequent suppression of gene transcription and translation. Therefore, in the presence of significant damage cell death is instigated to ensure that genomic stability is maintained. While most stresses lead to an arrest in mitosis, some promote premature mitotic exit, allowing cells to bypass mitotic cell death. This mini-review will focus on the effects and outcomes that common stresses have on mitosis, and how this impacts on the efficacy of mitotic chemotherapies.
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Affiliation(s)
- Andrew Burgess
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research , Sydney, NSW , Australia ; St. Vincent's Clinical School, Faculty of Medicine, UNSW Australia , Sydney, NSW , Australia
| | - Mina Rasouli
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research , Sydney, NSW , Australia
| | - Samuel Rogers
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research , Sydney, NSW , Australia
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9
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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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10
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Schoenmakers EFPM, Bunt J, Hermers L, Schepens M, Merkx G, Janssen B, Kersten M, Huys E, Pauwels P, Debiec-Rychter M, van Kessel AG. Identification of CUX1 as the recurrent chromosomal band 7q22 target gene in human uterine leiomyoma. Genes Chromosomes Cancer 2012; 52:11-23. [PMID: 22965931 DOI: 10.1002/gcc.22001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 08/01/2012] [Indexed: 11/12/2022] Open
Abstract
Uterine leiomyomas are benign solid tumors of mesenchymal origin which occur with an estimated incidence of up to 77% of all women of reproductive age. The majority of these tumors remains symptomless, but in about a quarter of cases they cause leiomyoma-associated symptoms including chronic pelvic pain, menorrhagia-induced anemia, and impaired fertility. As a consequence, they are the most common indication for pre-menopausal hysterectomy in the USA and Japan and annually translate into a multibillion dollar healthcare problem. Approximately 40% of these neoplasms present with recurring structural cytogenetic anomalies, including del(7)(q22), t(12;14)(q15;q24), t(1;2)(p36;p24), and anomalies affecting 6p21 and/or 10q22. Using positional cloning strategies, we and others previously identified HMGA1, HMGA2, RAD51L1, MORF, and, more recently, NCOA1 as primary target (fusion) genes associated with tumor initiation in four of these distinct cytogenetic subgroups. Despite the fact that the del(7)(q22) subgroup is the largest among leiomyomas, and was first described more than twenty years ago, the 7q22 leiomyoma target gene still awaits unequivocal identification. We here describe a positional cloning effort from two independent uterine leiomyomas, containing respectively a pericentric and a paracentric chromosomal inversion, both affecting band 7q22. We found that both chromosomal inversions target the cut-like homeobox 1 (CUX1) gene on chromosomal band 7q22.1 in a way which is functionally equivalent to the more frequently observed del(7q) cases, and which is compatible with a mono-allelic knock-out scenario, similar as was previously described for the cytogenetic subgroup showing chromosome 14q involvement.
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Affiliation(s)
- Eric F P M Schoenmakers
- Department of Human Genetics, Radboud University Nijmegen Medical Centre and Nijmegen Centre for Molecular Life Sciences, Nijmegen, The Netherlands.
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11
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Vadnais C, Davoudi S, Afshin M, Harada R, Dudley R, Clermont PL, Drobetsky E, Nepveu A. CUX1 transcription factor is required for optimal ATM/ATR-mediated responses to DNA damage. Nucleic Acids Res 2012; 40:4483-95. [PMID: 22319212 PMCID: PMC3378881 DOI: 10.1093/nar/gks041] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The p110 Cut homeobox 1 (CUX1) transcription factor regulates genes involved in DNA replication and chromosome segregation. Using a genome-wide-approach, we now demonstrate that CUX1 also modulates the constitutive expression of DNA damage response genes, including ones encoding ATM and ATR, as well as proteins involved in DNA damage-induced activation of, and signaling through, these kinases. Consistently, RNAi knockdown or genetic inactivation of CUX1 reduced ATM/ATR expression and negatively impacted hallmark protective responses mediated by ATM and ATR following exposure to ionizing radiation (IR) and UV, respectively. Specifically, abrogation of CUX1 strongly reduced ATM autophosphorylation after IR, in turn causing substantial decreases in (i) levels of phospho-Chk2 and p53, (ii) γ-H2AX and Rad51 DNA damage foci and (iii) the efficiency of DNA strand break repair. Similarly remarkable reductions in ATR-dependent responses, including phosphorylation of Chk1 and H2AX, were observed post-UV. Finally, multiple cell cycle checkpoints and clonogenic survival were compromised in CUX1 knockdown cells. Our results indicate that CUX1 regulates a transcriptional program that is necessary to mount an efficient response to mutagenic insult. Thus, CUX1 ensures not only the proper duplication and segregation of the genetic material, but also the preservation of its integrity.
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Affiliation(s)
- Charles Vadnais
- Goodman Cancer Centre, Department of Biochemistry, McGill University, 1160 Pine avenue West, Montreal, Quebec, Canada, H3A 1A3
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12
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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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13
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Suppressive effect of enzymatically modified isoquercitrin on phenobarbital-induced liver tumor promotion in rats. Arch Toxicol 2011; 85:1475-84. [PMID: 21445586 DOI: 10.1007/s00204-011-0696-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 03/10/2011] [Indexed: 02/06/2023]
Abstract
To investigate the effect of enzymatically modified isoquercitrin (EMIQ) on hepatocellular tumor promotion induced by phenobarbital (PB), male rats were administered a single intraperitoneal injection of 200 mg/kg N-diethylnitrosamine (DEN) and then fed with a diet containing PB (500 ppm) for 8 weeks, with or without EMIQ (2,000 ppm) in the drinking water. One week after PB administration, rats underwent a two-thirds partial hepatectomy. The PB-induced increase in the number and area of glutathione S-transferase placental form-positive foci and the proliferating cell nuclear antigen-positive ratio was significantly suppressed by EMIQ. Real-time reverse transcription-polymerase chain reaction analysis revealed increases in mRNA expression levels of Cyp2b2 and Mrp2 in the DEN-PB and DEN-PB-EMIQ groups compared with the DEN-alone group, while the level of Mrp2 decreased in the DEN-PB-EMIQ group compared with the DEN-PB group. There were no significant changes in microsomal reactive oxygen species (ROS) production and oxidative stress markers between the DEN-PB and DEN-PB-EMIQ groups. Immunohistochemically, the constitutive active/androstane receptor (CAR) in the DEN-PB group was clearly localized in the nuclei, but its immunoreactive intensity was decreased in the DEN-PB-EMIQ group. These results indicate that EMIQ suppressed the liver tumor-promoting activity of PB by inhibiting nuclear translocation of CAR, and not by suppression of oxidative stress.
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