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Wang J, Yang B, Wang Y, Liu S, Ma C, Piao J, Ma S, Yu D, Wu W. CBX2 enhances the progression and TMZ chemoresistance of glioma via EZH2-mediated epigenetic silencing of PTEN expression. Front Pharmacol 2024; 15:1430891. [PMID: 39114365 PMCID: PMC11303140 DOI: 10.3389/fphar.2024.1430891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Accepted: 07/04/2024] [Indexed: 08/10/2024] Open
Abstract
Chromobox (CBX) 2, a member of the CBX protein family and a crucial component of the polycomb repressive complex (PRC), exerts significant influence on the epigenetic regulation of tumorigenesis, including glioma. However, the precise role of CBX2 in glioma has remained elusive. In our study, we observed a substantial upregulation of CBX2 expression in glioma, which displayed a strong correlation with pathological grade, chemoresistance, and unfavorable prognosis. Through a series of in vivo and in vitro experiments, we established that heightened CBX2 expression facilitated glioma cell proliferation and bolstered resistance to chemotherapy. Conversely, CBX2 knockdown led to a significant inhibition of glioma cell growth and a reduction in chemoresistance. Notably, our investigation uncovered the underlying mechanism by which CBX2 operates, primarily by inhibiting PTEN transcription and activating the AKT/mTOR signalling pathway. Conversely, silencing CBX2 curtailed cell proliferation and attenuated chemoresistance by impeding the activation of the PTEN/AKT/mTOR signalling pathway. Delving deeper into the molecular intricacies, we discovered that CBX2 can recruit EZH2 and modulate the trimethylation of histone H3 lysine 27 (H3K27me3) levels on the PTEN promoter, effectively suppressing PTEN transcription. Our research unveils a comprehensive understanding of how CBX2 impacts the tumorigenesis, progression, chemoresistance, and prognosis of glioma. Furthermore, it presents CBX2 as a promising therapeutic target for drug development and clinical management of glioma.
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Affiliation(s)
- Jian Wang
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
| | - Bo Yang
- Department of Thoracic Surgery, The First Hospital of Jilin University, Changchun, China
| | - Yingzhao Wang
- Department of Neurology, Qianwei Hospital of Jilin Province, Changchun, China
| | - Shuhan Liu
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
| | - Changkai Ma
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
| | - Jianmin Piao
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
| | - Shiqiang Ma
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
| | - Dehai Yu
- Core Facility, The First Hospital of Jilin University, Changchun, China
| | - Wei Wu
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, China
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2
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Liu Y, Yao Y, Zhang Y, Xu C, Yang T, Qu M, Lu B, Song X, Pan X, Zhou W, Cui X. Identification of prognostic stemness-related genes in kidney renal papillary cell carcinoma. BMC Med Genomics 2024; 17:121. [PMID: 38702698 PMCID: PMC11067181 DOI: 10.1186/s12920-024-01870-2] [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: 08/15/2023] [Accepted: 04/09/2024] [Indexed: 05/06/2024] Open
Abstract
BACKGROUND Kidney renal papillary cell carcinoma (KIRP) is the second most prevalent malignant cancer originating from the renal epithelium. Nowadays, cancer stem cells and stemness-related genes (SRGs) are revealed to play important roles in the carcinogenesis and metastasis of various tumors. Consequently, we aim to investigate the underlying mechanisms of SRGs in KIRP. METHODS RNA-seq profiles of 141 KIRP samples were downloaded from the TCGA database, based on which we calculated the mRNA expression-based stemness index (mRNAsi). Next, we selected the differentially expressed genes (DEGs) between low- and high-mRNAsi groups. Then, we utilized weighted gene correlation network analysis (WGCNA) and univariate Cox analysis to identify prognostic SRGs. Afterwards, SRGs were included in the multivariate Cox regression analysis to establish a prognostic model. In addition, a regulatory network was constructed by Pearson correlation analysis, incorporating key genes, upstream transcription factors (TFs), and downstream signaling pathways. Finally, we used Connectivity map analysis to identify the potential inhibitors. RESULTS In total, 1124 genes were characterized as DEGs between low- and high-RNAsi groups. Based on six prognostic SRGs (CCKBR, GPR50, GDNF, SPOCK3, KC877982.1, and MYO15A), a prediction model was established with an area under curve of 0.861. Furthermore, among the TFs, genes, and signaling pathways that had significant correlations, the CBX2-ASPH-Notch signaling pathway was the most significantly correlated. Finally, resveratrol might be a potential inhibitor for KIRP. CONCLUSIONS We suggested that CBX2 could regulate ASPH through activation of the Notch signaling pathway, which might be correlated with the carcinogenesis, development, and unfavorable prognosis of KIRP.
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Affiliation(s)
- Yifan Liu
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China
| | - Yuntao Yao
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China
| | - Yu Zhang
- Tongji University School of Medicine, Shanghai, 200092, China
| | - Chengdang Xu
- Tongji University School of Medicine, Shanghai, 200092, China
| | - Tianyue Yang
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China
| | - Mingyu Qu
- Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Bingnan Lu
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China
| | - Xu Song
- Department of Urology, Shanghai Seventh People's Hospital, Shanghai, Shandong, 200137, China.
| | - Xiuwu Pan
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China.
| | - Wang Zhou
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China.
| | - Xingang Cui
- Department of Urology, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No.1665 Kongjiang Road, Shanghai, 200092, China.
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Park S, Choi J, Song JK, Jang B, Maeng YH. Subcellular expression pattern and clinical significance of CBX2 and CBX7 in breast cancer subtypes. Med Mol Morphol 2024; 57:11-22. [PMID: 37553450 DOI: 10.1007/s00795-023-00368-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 07/28/2023] [Indexed: 08/10/2023]
Abstract
Chromobox (CBX)2 and CBX7, members of CBX family protein, show diverse expression patterns and contrasting roles in certain cancers. We aimed to investigate the subcellular expression patterns and clinical significances of CBXs in breast cancer (BC) subtypes, which have heterogeneous clinical course and therapeutic responses. Among the subtypes, the triple-negative BC (TNBC) is a heterogeneous group that lacks specific markers. We categorized TNBC into quadruple-negative BC (QNBC) and TNBC, based on androgen receptor (AR) status, to make the groups more homogeneous. Immunohistochemistry for CBX proteins was performed on 323 primary invasive BC tissues and their clinical significances were analyzed. Cytoplasmic CBX2 (CBX2-c) was linked to adverse clinicopathological factors and TNBC and QNBC subtypes. In contrast, nuclear CBX7 (CBX7-n) was associated with favorable parameters and luminal A subtype. CBX2-c expression increased progressively from that in benign lesions to that in in situ carcinomas and invasive cancers, whereas CBX7-n and AR expressions showed sequential downregulation. AR was lower in metastatic tissues compared to matched primary cancer tissues. We speculate that the upregulation of CBX2-c and downregulation of CBX7-n could play a role in breast oncogenesis and an adverse clinical course, suggesting them as potential prognostic markers and therapeutic targets in invasive BCs.
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Affiliation(s)
- Sungjoon Park
- Department of Pathology, Jeju National University Hospital, Jeju, 63241, South Korea
| | - Jaehyuck Choi
- Department of Surgery, Jeju National University School of Medicine, Jeju, 63241, South Korea
| | - Jung-Kook Song
- Department of Preventive Medicine, Jeju National University School of Medicine, Jeju, 63241, South Korea
| | - Bogun Jang
- Department of Pathology, Jeju National University Hospital, Jeju, 63241, South Korea
- Department of Pathology, Jeju National University School of Medicine, Aran 13-gil 15, Jeju, 63241, South Korea
| | - Young Hee Maeng
- Department of Pathology, Jeju National University Hospital, Jeju, 63241, South Korea.
- Department of Pathology, Jeju National University School of Medicine, Aran 13-gil 15, Jeju, 63241, South Korea.
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de Groot AP, de Haan G. How CBX proteins regulate normal and leukemic blood cells. FEBS Lett 2024. [PMID: 38426219 DOI: 10.1002/1873-3468.14839] [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: 10/19/2023] [Revised: 01/26/2024] [Accepted: 02/09/2024] [Indexed: 03/02/2024]
Abstract
Hematopoietic stem cell (HSC) fate decisions are dictated by epigenetic landscapes. The Polycomb Repressive Complex 1 (PRC1) represses genes that induce differentiation, thereby maintaining HSC self-renewal. Depending on which chromobox (CBX) protein (CBX2, CBX4, CBX6, CBX7, or CBX8) is part of the PRC1 complex, HSC fate decisions differ. Here, we review how this occurs. We describe how CBX proteins dictate age-related changes in HSCs and stimulate oncogenic HSC fate decisions, either as canonical PRC1 members or by alternative interactions, including non-epigenetic regulation. CBX2, CBX7, and CBX8 enhance leukemia progression. To target, reprogram, and kill leukemic cells, we suggest and describe multiple therapeutic strategies to interfere with the epigenetic functions of oncogenic CBX proteins. Future studies should clarify to what extent the non-epigenetic function of cytoplasmic CBX proteins is important for normal, aged, and leukemic blood cells.
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Affiliation(s)
- Anne P de Groot
- European Research Institute for Biology of Ageing (ERIBA), University Medical Center Groningen (UMCG), The Netherlands
- Sanquin Research, Landsteiner Laboratory, Sanquin Blood Supply, Amsterdam, The Netherlands
| | - Gerald de Haan
- European Research Institute for Biology of Ageing (ERIBA), University Medical Center Groningen (UMCG), The Netherlands
- Sanquin Research, Landsteiner Laboratory, Sanquin Blood Supply, Amsterdam, The Netherlands
- Department of Hematology, Amsterdam UMC, University of Amsterdam, The Netherlands
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Ma Q, Chen L, Feng K, Guo W, Huang T, Cai YD. Exploring Prognostic Gene Factors in Breast Cancer via Machine Learning. Biochem Genet 2024:10.1007/s10528-024-10712-w. [PMID: 38383836 DOI: 10.1007/s10528-024-10712-w] [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: 08/12/2023] [Accepted: 01/21/2024] [Indexed: 02/23/2024]
Abstract
Breast cancer remains the most prevalent cancer in women. To date, its underlying molecular mechanisms have not been fully uncovered. The determination of gene factors is important to improve our understanding on breast cancer, which can correlate the specific gene expression and tumor staging. However, the knowledge in this regard is still far from complete. Thus, this study aimed to explore these knowledge gaps by analyzing existing gene expression profile data from 3149 breast cancer samples, where each sample was represented by the expression of 19,644 genes and classified into Nottingham histological grade (NHG) classes (Grade 1, 2, and 3). To this end, a machine learning-based framework was designed. First, the profile data were analyzed by using seven feature ranking algorithms to evaluate the importance of features (genes). Seven feature lists were generated, each of which sorted features in accordance with feature importance evaluated from a special aspect. Then, the incremental feature selection method was applied to each list to determine essential features for classification and building efficient classifiers. Consequently, overlapping genes, such as AURKA, CBX2, and MYBL2, were deemed as potentially related to breast cancer malignancy and prognosis, indicating that such genes were identified to be important by multiple feature ranking algorithms. In addition, the study formulated classification rules to reflect special gene expression patterns for three NHG classes. Some genes and rules were analyzed and supported by recent literature, providing new references for studying breast cancer.
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Affiliation(s)
- QingLan Ma
- School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Lei Chen
- College of Information Engineering, Shanghai Maritime University, Shanghai, 201306, China
| | - KaiYan Feng
- Department of Computer Science, Guangdong AIB Polytechnic College, Guangzhou, 510507, China
| | - Wei Guo
- Key Laboratory of Stem Cell Biology, Shanghai Jiao Tong University School of Medicine (SJTUSM) & Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS), Shanghai, 200030, China
| | - Tao Huang
- Bio-Med Big Data Center, CAS Key Laboratory of Computational Biology, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Yu-Dong Cai
- School of Life Sciences, Shanghai University, Shanghai, 200444, China.
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Wu J, Fu G, Luo C, Chen L, Liu Q. Cuproptosis-related ceRNA axis triggers cell proliferation and cell cycle through CBX2 in lung adenocarcinoma. BMC Pulm Med 2024; 24:85. [PMID: 38355480 PMCID: PMC10865584 DOI: 10.1186/s12890-024-02887-0] [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: 08/09/2023] [Accepted: 01/27/2024] [Indexed: 02/16/2024] Open
Abstract
BACKGROUND Lung adenocarcinoma (LUAD) has high morbidity and mortality. Despite substantial advances in treatment, the prognosis of patients with LUAD remains unfavorable. The ceRNA axis has been reported to play an important role in the pathogenesis of LUAD. In addition, cuproptosis is considered an important factor in tumorigenesis. The expression of CBX2 has been associated with the development of multiple tumors, including LUAD. However, the precise molecular mechanisms through which the cuproptosis-related ceRNA network regulates CBX2 remain unclear. METHODS The DEGs between tumor and normal samples of LUAD were identified in TCGA database. The "ConsensusClusterPlus" R package was used to perform consensus clustering based on the mRNA expression matrix and cuproptosis-related gene expression profile. Then, LASSO-COX regression analysis was performed to identify potential prognostic biomarkers associated with cuproptosis, and the ceRNA network was constructed. Finally, the mechanisms of ceRNA in LUAD was studied by cell experiments. RESULTS In this study, the AC144450.1/miR-424-5p axis was found to promote the progression of LUAD by acting on CBX2. The expression of AC144450.1 and miR-424-5p can be altered to regulate CBX2 and is correlated with cell proliferation and cell cycle of LUAD. Mechanistically, AC144450.1 affects the expression of CBX2 by acting as the ceRNA of miR-424-5p. In addition, a cuproptosis-related model were constructed in this study to predict the prognosis of LUAD. CONCLUSIONS This study is the first to demonstrate that the AC144450.1/miR-424-5p/CBX2 axis is involved in LUAD progression and may serve as a novel target for its diagnosis and treatment.
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Affiliation(s)
- Jiang Wu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, 400037, Chongqing, China
| | - Guang Fu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, 400037, Chongqing, China
| | - Chao Luo
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, 400037, Chongqing, China
| | - Liang Chen
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, 400037, Chongqing, China
| | - Quanxing Liu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, 400037, Chongqing, China.
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Liao D, Liu X, He L, Yao Y, Yuan X, Feng P, Li C, Liu Y. Comprehensive bioinformatics analysis of the expression, prognostic value, and immune infiltration of chromobox family members in cervical cancer. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2023; 26:468-477. [PMID: 37009012 PMCID: PMC10008395 DOI: 10.22038/ijbms.2023.64845.14281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 12/06/2022] [Indexed: 04/04/2023]
Abstract
Objectives Cervical cancer (CC) is the fourth most prevalent type of cancer in women worldwide and it is considered the leading cause of tumor-related death and malignancy. As part of complexes involved in epigenetic control, the proteins of the chromobox (CBX) family have been found to have a role in the growth of malignancies by preventing differentiation and increasing proliferation. Here, by a thorough investigation, we investigated the expression, prognostic significance, and immune infiltration of CBX in patients with CC. Materials and Methods Differential expression, clinicopathological parameters, immune cell infiltration, enrichment analysis, genetic alteration, and prognostic value of CBXs in patients with CC were examined using TIMER, Metascape, STRING, GeneMANIA, cBioPortal, UALCAN, The Human Protein Atlas, Gene Expression Profiling Interactive Analysis (GEPIA), and Oncomine. Results In CC tissues, CBX 2/3/4/5 and CBX 8 expression levels were considerably higher, whereas CBX 6/7 expression levels were lower. In CC, the CBX 5/6/8 promoters have elevated levels of methylation. The expression of CBX 2/6/8 and the pathological stage were connected. A 37% mutation rate of the differentially expressed CBX genes was observed. Also, there was a strong correlation of the CBXs expression with immune cell infiltration, such as T CD4+ cells, macrophages, neutrophils, B cells, T CD8+ cells, and dendritic cells. Conclusion The investigation discovered that members of the CBXs family may be therapeutic targets for CC patients and may play significant roles in the development of CC tumors.
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Affiliation(s)
- Dan Liao
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
| | - Xiaomei Liu
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
| | - Limei He
- Hospital of Southern Medical University, Dongguan, Guangdong, China
| | - Yuhong Yao
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
| | - Xiuying Yuan
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
| | - Poling Feng
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
| | - Cuifen Li
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
- Corresponding authors: Cuifen Li. Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s Hospital of Southern Medical University, Dongguan, Guangdong, China. Tel/Fax: +86-076981368279; ; Yanyan Liu. Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s Hospital of Southern Medical University, Dongguan, Guangdong, China. Tel/Fax: + 86-076981368278;
| | - Yanyan Liu
- Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s
- Corresponding authors: Cuifen Li. Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s Hospital of Southern Medical University, Dongguan, Guangdong, China. Tel/Fax: +86-076981368279; ; Yanyan Liu. Department of Gynaecology, SSL Central Hospital of Dongguan, Dongguan Third People’s Hospital, Affiliated Dongguan Shilong People’s Hospital of Southern Medical University, Dongguan, Guangdong, China. Tel/Fax: + 86-076981368278;
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Wang L, Zhao L, Zhang Y, Shao S, Ning Q, Zhao X, Luo M. Comprehensive Analysis of the Expression and Prognosis of chromobox Family Members in Breast Cancer. Clin Breast Cancer 2023; 23:e206-e218. [PMID: 36890004 DOI: 10.1016/j.clbc.2023.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 02/04/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023]
Abstract
BACKGROUND Chromobox proteins are canonical components of the Polycomb group family and play pivotal roles in several cancers. However, little is known about the function, prognostic value and drug sensitivity of CBX family members in breast cancer. METHODS In this study we investigated the expression, prognosis value and drug sensitivity of CBX family in breast cancer using the ONCOMINE, GEPIA, Human Protein Atlas and Kaplan-Meier Plotter databases, etc. and preliminary verified the expression of CBX family in breast cancer cell lines by RT-qPCR. RESULTS We found that the expression levels of CBX1/2/3/4/8 members were elevated in breast cancer tissues compared to adjacent normal breast tissues, while the expression levels of CBX6/7 genes were reduced in breast cancer tissue. In vitro qRT-PCR validated the expression differences of CBX1/2/3/4/8 in breast cancer cell lines. Further analysis showed expression of CBX family members was remarkably correlated with cancer subgroups. As nodal metastasis status increased, the mRNA expression of CBX1/2/3/4/8 members tended to be higher, while CBX6/7 tended to be lower. The expression of CBX1/2/3 was higher in patients with TP53 mutation and CBX6/7 expression tended to be lower in patients with TP53 mutation groups. High transcription levels of CBX2/3 were significantly associated with shorter overall survival in breast cancer patients, while lower expression of CBX4/5/6/7 members was associated with unfavorable overall survival. Moreover, a high mutation rate of CBX gene members (43%) was observed in breast cancer patients, and genetic alterations in CBX genes was associated with poor prognosis. CONCLUSION Taken together, our results indicated that CBX2/3/6/7/8 could be considered prognostic and therapeutic biomarkers of breast cancer and are worthy of further study.
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Affiliation(s)
- Lu Wang
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China
| | - Lin Zhao
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China
| | - Yujiao Zhang
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China
| | - Shan Shao
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China
| | - Qian Ning
- Department of Respiratory, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China
| | - Xinhan Zhao
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China.
| | - Minna Luo
- Department of Hematology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710061, China.
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Wang J, Yang B, Zhang X, Liu S, Pan X, Ma C, Ma S, Yu D, Wu W. Chromobox proteins in cancer: Multifaceted functions and strategies for modulation (Review). Int J Oncol 2023; 62:36. [PMID: 36734270 PMCID: PMC9937689 DOI: 10.3892/ijo.2023.5484] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 01/23/2023] [Indexed: 02/01/2023] Open
Abstract
Chromobox (CBX) proteins are important epigenetic regulatory proteins and are widely involved in biological processes, such as embryonic development, the maintenance of stem cell characteristics and the regulation of cell proliferation and apoptosis. Disorder and dysfunction of CBXs in cancer usually lead to the blockade or ectoptic activation of developmental pathways, promoting the occurrence, development and progression of cancer. In the present review, the characteristics and functions of CBXs were first introduced. Subsequently, the expression of CBXs in cancers and the relationship between CBXs and clinical characteristics (mainly cancer grade, stage, metastasis and relapse) and prognosis were discussed. Finally, it was described how CBXs regulate cell proliferation and self‑renewal, apoptosis and the acquisition of malignant phenotypes, such as invasion, migration and chemoresistance, through mechanisms involving epigenetic modification, nuclear translocation, noncoding RNA interactions, transcriptional regulation, posttranslational modifications, protein‑protein interactions, signal transduction and metabolic reprogramming. The study also focused on cancer therapies targeting CBXs. The present review provides new insight and a comprehensive basis for follow‑up research on CBXs and cancer.
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Affiliation(s)
- Jian Wang
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Bo Yang
- Department of Thoracic Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Xiuhang Zhang
- Department of Burn Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Shuhan Liu
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Xiaoqiang Pan
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Changkai Ma
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Shiqiang Ma
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Dehai Yu
- Department of Public Research Platform, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China,Professor Dehai Yu, Public Research Platform, The First Hospital of Jilin University, 1 Xinmin Street, Changchun, Jilin 130021, P.R. China, E-mail:
| | - Wei Wu
- Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China,Correspondence to: Professor Wei Wu, Department of Neurovascular Surgery, The First Hospital of Jilin University, 1 Xinmin Street, Changchun, Jilin 130021, P.R. China, E-mail:
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Tian H, Zhao T, Li Y, Sun N, Ma D, Shi Q, Zhang G, Chen Q, Zhang K, Chen C, Zhang Y, Qi X. Chromobox Family Proteins as Putative Biomarkers for Breast Cancer Management: A Preliminary Study Based on Bioinformatics Analysis and qRT-PCR Validation. BREAST CANCER (DOVE MEDICAL PRESS) 2022; 14:515-535. [PMID: 36605919 PMCID: PMC9809168 DOI: 10.2147/bctt.s381856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 12/08/2022] [Indexed: 12/31/2022]
Abstract
Background Epigenetic modification of chromatin is an important step in the regulation of gene expression. The chromobox family proteins (CBXs), as epigenetic modifier, may play a vital role in tumorigenesis and cancer progression. Herein we explored the correlation between CBXs and breast cancer (BC) via the bioinformatics approach and qRT-PCR validation. Methods Several databases, including GEPIA, TCGA, GEO, K-M plotter, STRING, DAVID, cBioPortal, CIBERSORT, and HPA were employed to analyze the expression levels of CBXs and the correlations between CBXs and prognosis (overall and recurrence-free survival) in BC. We analyzed molecular functions, genetic variations, transcription factors of CBXs, and immune cell infiltration status. ROC curve analysis was performed to determine the predictive value of CBXs. RNA extracted from 11 human BC and paired adjacent normal tissues were subjected to qRT-PCR. Results The mRNA expression level of CBX1-5 was significantly upregulated, while that of CBX7 was significantly downregulated in BC; no expression disparities were observed in CBX6/8 expression. Further, high mRNA expression of CBX1/2/3/4/8 correlated with advanced BC, whereas high mRNA expression of CBX6/7 correlated with early BC. High mRNA expressions of CBX1/2/3/5 predict poor OS and RFS, while higher mRNA expressions of CBX6/7 predict better OS and RFS in patients with BC. ROC curve analysis revealed that CBX3 showed excellent discriminatory ability. Gene ontology enrichment analysis showed that CBXs primarily participated in SUMOylation and post-/transcriptional regulation. Moreover, they presented varying degrees of amplification in BC tissues and were related to the infiltration of various immune cells. Conclusion CBXs can serve as putative biomarkers for BC. Further studies are warranted to determine the exact molecular mechanisms underlying the action of CBXs in BC, particularly CBX1/2/3/5/7.
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Affiliation(s)
- Hao Tian
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Tingting Zhao
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Yanling Li
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Na Sun
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Dandan Ma
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Qiyun Shi
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Guozhi Zhang
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Qingqiu Chen
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Kongyong Zhang
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Ceshi Chen
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, People’s Republic of China
| | - Yi Zhang
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China
| | - Xiaowei Qi
- Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Chongqing, People’s Republic of China,Correspondence: Xiaowei Qi; Yi Zhang, Department of Breast and Thyroid Surgery, Southwest Hospital, Army Medical University, Gaotanyan Street 29, Chongqing, 400038, People’s Republic of China, Tel/Fax +86-23-68754160, Email ;
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11
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The Epigenetic Regulatory Protein CBX2 Promotes mTORC1 Signalling and Inhibits DREAM Complex Activity to Drive Breast Cancer Cell Growth. Cancers (Basel) 2022; 14:cancers14143491. [PMID: 35884550 PMCID: PMC9321755 DOI: 10.3390/cancers14143491] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 11/17/2022] Open
Abstract
Chromobox 2 (CBX2) is a chromatin-binding component of polycomb repressive complex 1, which causes gene silencing. CBX2 expression is elevated in triple-negative breast cancer (TNBC), for which there are few therapeutic options. Here, we aimed to investigate the functional role of CBX2 in TNBC. CBX2 knockdown in TNBC models reduced cell numbers, which was rescued by ectopic expression of wild-type CBX2 but not a chromatin binding-deficient mutant. Blocking CBX2 chromatin interactions using the inhibitor SW2_152F also reduced cell growth, suggesting CBX2 chromatin binding is crucial for TNBC progression. RNA sequencing and gene set enrichment analysis of CBX2-depleted cells identified downregulation of oncogenic signalling pathways, including mTORC1 and E2F signalling. Subsequent analysis identified that CBX2 represses the expression of mTORC1 inhibitors and the tumour suppressor RBL2. RBL2 repression, in turn, inhibits DREAM complex activity. The DREAM complex inhibits E2F signalling, causing cell senescence; therefore, inhibition of the DREAM complex via CBX2 may be a key oncogenic driver. We observed similar effects in oestrogen receptor-positive breast cancer, and analysis of patient datasets suggested CBX2 inhibits RBL2 activity in other cancer types. Therapeutic inhibition of CBX2 could therefore repress mTORC1 activation and promote DREAM complex-mediated senescence in TNBC and could have similar effects in other cancer types.
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12
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Del Gaudio N, Di Costanzo A, Liu NQ, Conte L, Dell'Aversana C, Bove G, Benedetti R, Montella L, Ciardiello F, Carafa V, Ambrosino C, Tucci V, Conte M, Martens JHA, Stunnenberg HG, Nebbioso A, Altucci L. CBX2 shapes chromatin accessibility promoting AML via p38 MAPK signaling pathway. Mol Cancer 2022; 21:125. [PMID: 35681235 PMCID: PMC9178829 DOI: 10.1186/s12943-022-01603-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 05/31/2022] [Indexed: 12/14/2022] Open
Abstract
Background The dynamic epigenome and proteins specialized in the interpretation of epigenetic marks critically contribute to leukemic pathogenesis but also offer alternative therapeutic avenues. Targeting newly discovered chromatin readers involved in leukemogenesis may thus provide new anticancer strategies. Accumulating evidence suggests that the PRC1 complex member CBX2 is overexpressed in solid tumors and promotes cancer cell survival. However, its role in leukemia is still unclear. Methods We exploited reverse genetic approaches to investigate the role of CBX2 in human leukemic cell lines and ex vivo samples. We also analyzed phenotypic effects following CBX2 silencing using cellular and molecular assays and related functional mechanisms by ATAC-seq and RNA-seq. We then performed bioinformatic analysis of ChIP-seq data to explore the influence of histone modifications in CBX2-mediated open chromatin sites. Lastly, we used molecular assays to determine the contribution of CBX2-regulated pathways to leukemic phenotype. Results We found CBX2 overexpressed in leukemia both in vitro and ex vivo samples compared to CD34+ cells. Decreased CBX2 RNA levels prompted a robust reduction in cell proliferation and induction of apoptosis. Similarly, sensitivity to CBX2 silencing was observed in primary acute myeloid leukemia samples. CBX2 suppression increased genome-wide chromatin accessibility followed by alteration of leukemic cell transcriptional programs, resulting in enrichment of cell death pathways and downregulation of survival genes. Intriguingly, CBX2 silencing induced epigenetic reprogramming at p38 MAPK-associated regulatory sites with consequent deregulation of gene expression. Conclusions Our results identify CBX2 as a crucial player in leukemia progression and highlight a potential druggable CBX2-p38 MAPK network in AML. Supplementary Information The online version contains supplementary material available at 10.1186/s12943-022-01603-y.
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Affiliation(s)
- Nunzio Del Gaudio
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Antonella Di Costanzo
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Ning Qing Liu
- Division of Gene Regulation, Netherlands Cancer Institute (NKI), Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Lidio Conte
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Carmela Dell'Aversana
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy.,Institute of Experimental Endocrinology and Oncology "Gaetano Salvatore" (IEOS), National Research Council (CNR), 80131, Naples, Italy
| | - Guglielmo Bove
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Rosaria Benedetti
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Liliana Montella
- Medical Oncology Complex Unit, "Santa Maria delle Grazie" Hospital, ASL Napoli 2 Nord, Naples, Italy
| | - Fortunato Ciardiello
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Vincenzo Carafa
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Concetta Ambrosino
- Biogem Institute of Molecular Biology and Genetics, Ariano Irpino, Italy
| | - Valeria Tucci
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy.,Biogem Institute of Molecular Biology and Genetics, Ariano Irpino, Italy
| | - Mariarosaria Conte
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Joost H A Martens
- Department of Molecular Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Radboud University, 6525, GA, Nijmegen, The Netherlands
| | - Hendrik G Stunnenberg
- Department of Molecular Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Radboud University, 6525, GA, Nijmegen, The Netherlands.,Princess Maxima Centre for Pediatric Oncology, 3584, CS, Utrecht, The Netherlands
| | - Angela Nebbioso
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy
| | - Lucia Altucci
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Vico L. De Crecchio 7, 80138, Naples, Italy. .,Biogem Institute of Molecular Biology and Genetics, Ariano Irpino, Italy.
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13
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Wang L, Ren B, Zhuang H, Zhong Y, Nan Y. CBX2 Induces Glioma Cell Proliferation and Invasion Through the Akt/PI3K Pathway. Technol Cancer Res Treat 2021; 20:15330338211045831. [PMID: 34709960 PMCID: PMC8558802 DOI: 10.1177/15330338211045831] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Glioma is the most common primary intracranial tumor. Abnormal expression of CBX2 (ChromoBox2) is associated with tumorigenesis and tumor development. TCGA data in UALCAN showed that CBX2 was overexpressed in glioma tissue. To confirm the role of CBX2 in glioma, we regulated the level of CBX2 and conducted colony formation, Transwell, and CCK-8 assays to verify the effect of CBX2. The results showed that CBX2 knockdown reduced glioma cell proliferation and invasion and that the cells were less tumorigenic. CBX2 overexpression induced glioma cell proliferation and invasion and glioma stem cell self-renewal. The animal experiments showed that CBX2 knockdown inhibited glioma growth and improved survival time. CBX2 knockdown inhibited activation of the Akt/PI3K pathway. epidermal growth factor rescued the effects of CBX2. CBX2 could induce the growth and invasion of glioma cells via the Akt/PI3K pathway.
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Affiliation(s)
- Le Wang
- 117865Tianjin Medical University General Hospital, Tianjin, China.,Tianjin Medical University General Hospital Airport Site, Tianjin, China
| | - Bingcheng Ren
- 117865Tianjin Medical University General Hospital, Tianjin, China.,Tianjin Medical University General Hospital Airport Site, Tianjin, China
| | - Hao Zhuang
- Cancer Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, China
| | - Yue Zhong
- 117865Tianjin Medical University General Hospital, Tianjin, China.,Tianjin Medical University General Hospital Airport Site, Tianjin, China
| | - Yang Nan
- 117865Tianjin Medical University General Hospital, Tianjin, China.,Tianjin Medical University General Hospital Airport Site, Tianjin, China
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14
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Song X, Wang TX, Zhu XN, Tan SK. Immunological and prognostic significance of CBX2 expression in hepatocellular carcinoma. Shijie Huaren Xiaohua Zazhi 2021; 29:1118-1129. [DOI: 10.11569/wcjd.v29.i19.1118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The number of cases of hepatocellular carcinoma (HCC), the sixth most common malignancy and the third leading cause of cancer death worldwide, has risen from 1.6 to 4.6 per 100000 people worldwide over the past 30 years. Guangxi has a high incidence of HCC in China, and its death rate ranks first in the spectrum of causes of tumor death in Guangxi, accounting for about 40% of all deaths from malignant tumors. Exploring the role of chromobox homolog 2 (CBX2) in HCC immunity will provide potential value for the treatment of this malignancy.
AIM To investigate the expression of CBX2 and analyze its immunological and prognostic significance in HCC.
METHODS The expression of CBX2 in 75 cases of HCC and matched non-tumor tissues was detected by tissue microarray and immunohistochemistry. The relationship of CBX2 expression with the clinicopathologic features of HCC and survival prognosis was analyzed. Then, the differential expression of CBX2 between HCC and normal tissues was verified in The Cancer Genomic Atlas (TCGA). Next, we explored the association between CBX2 expression and immunocyte infiltration, determined the relationship between CBX2 expression and immunosuppressors and immunostimulators, and identified the immune events that CBX2 was involved in through relevant GO and KEGG pathway enrichment analyses. A multi-gene risk prediction model was developed using a COX regression model, thereby generating a risk score that is an independent predictor of survival prognosis. ROC analysis was performed to assess the predictive accuracy of the risk score. Finally, a prognostic model with a calibration curve was constructed to predict the patients' survival probability at 3 and 5 years.
RESULTS The positive expression of CBX2 in HCC tissue was 66.7% (50/75), which was significantly higher than that in matched non-tumor tissues (25.3% (19/75); P < 0.01). The expression of CBX2 was associated with TNM stage and AFP status (P < 0.05). The survival time of patients in the CBX2 positive group was significantly lower than that of the CBX2 negative group, suggesting that CBX2 positive expression may be related to the prognosis of HCC patients. TCGA database verification reached the same conclusion. The expression of CBX2 was positively correlated with the infiltration levels of T helper 2 cells. CBX2 was identified to be associated with 10 immunosuppressors and 23 immunostimulators, and enriched analysis of related GO and KEGG pathways showed that CBX2 was associated with immune events such as intestinal immune network for immunoglobulin A production, cytokine-cytokine receptor interactions, cell adhesion molecules, and rheumatoid arthritis.
CONCLUSION CBX2 positive expression may be a prognostic risk factor in HCC patients. Our findings provide evidence for the role of CBX2 in tumor immunity in HCC, suggesting that CBX2 may be a potential immunoprognostic marker for HCC.
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Affiliation(s)
- Xin Song
- School of Public Health, Guilin Medical University, Guilin 541199, Guangxi Zhuang Autonomous Region, China
| | - Tian-Xian Wang
- School of Public Health, Guilin Medical University, Guilin 541199, Guangxi Zhuang Autonomous Region, China
| | - Xiao-Nian Zhu
- School of Public Health, Guilin Medical University, Guilin 541199, Guangxi Zhuang Autonomous Region, China
| | - Sheng-Kui Tan
- School of Public Health, Guilin Medical University, Guilin 541199, Guangxi Zhuang Autonomous Region, China
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15
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Zhou H, Xiong Y, Liu Z, Hou S, Zhou T. Expression and prognostic significance of CBX2 in colorectal cancer: database mining for CBX family members in malignancies and vitro analyses. Cancer Cell Int 2021; 21:402. [PMID: 34321009 PMCID: PMC8317347 DOI: 10.1186/s12935-021-02106-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 07/21/2021] [Indexed: 11/23/2022] Open
Abstract
Background The Chromobox (CBX) domain protein family, a core component of polycomb repressive complexes 1, is involved in transcriptional repression, cell differentiation, and program development by binding to methylated histone tails. Each CBX family member plays a distinct role in various biological processes through their own specific chromatin domains, due to differences in conserved sequences of the CBX proteins. It has been demonstrated that colorectal cancer (CRC) is a multiple-step biological evolutionary process, whereas the roles of the CBX family in CRC remain largely unclear. Methods In the present study, the expression and prognostic significance of the CBX family in CRC were systematically analyzed through a series of online databases, including Cancer Cell Line Encyclopedia (CCLE), Oncomine, Human Protein Atlas (HPA), and Gene Expression Profiling Interactive Analysis (GEPIA). For in vitro verification, we performed cell cloning, flow cytometry and transwell experiments to verify the proliferation and invasion ability of CRC cells after knocking down CBX2. Results Most CBX proteins were found to be highly expressed in CRC, but only the elevated expression of CBX2 could be associated with poor prognosis in patients with CRC. Further examination of the role of CBX2 in CRC was performed through several in vitro experiments. CBX2 was overexpressed in CRC cell lines via the CCLE database and the results were verified by RT-qPCR. Moreover, the knockdown of CBX2 significantly suppressed CRC cell proliferation and invasion. Furthermore, the downregulation of CBX2 was found to promote CRC cell apoptosis. Conclusions Based on these findings, CBX2 may function as an oncogene and potential prognostic biomarker. Thus, the association between the abnormal expression of CBX2 and the initiation of CRC deserves further exploration.
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Affiliation(s)
- He Zhou
- The Second Department of Gastrointestinal Surgery, Affiliated Hospital of North Sichuan Medical College, 63 Wenhua Road, Nanchong, 637000, Sichuan Province, China.,Institute of Hepatobiliary, Pancreatic and Intestinal Disease, North Sichuan Medical College, Nanchong, 637000, Sichuan, China
| | - Yongfu Xiong
- The First Department of Hepatobiliary Surgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, 637000, Sichuan, China.,Institute of Hepatobiliary, Pancreatic and Intestinal Disease, North Sichuan Medical College, Nanchong, 637000, Sichuan, China
| | - Zuoliang Liu
- The Second Department of Gastrointestinal Surgery, Affiliated Hospital of North Sichuan Medical College, 63 Wenhua Road, Nanchong, 637000, Sichuan Province, China.,Institute of Hepatobiliary, Pancreatic and Intestinal Disease, North Sichuan Medical College, Nanchong, 637000, Sichuan, China
| | - Songlin Hou
- The Second Department of Gastrointestinal Surgery, Affiliated Hospital of North Sichuan Medical College, 63 Wenhua Road, Nanchong, 637000, Sichuan Province, China.,Institute of Hepatobiliary, Pancreatic and Intestinal Disease, North Sichuan Medical College, Nanchong, 637000, Sichuan, China
| | - Tong Zhou
- The Second Department of Gastrointestinal Surgery, Affiliated Hospital of North Sichuan Medical College, 63 Wenhua Road, Nanchong, 637000, Sichuan Province, China. .,Institute of Hepatobiliary, Pancreatic and Intestinal Disease, North Sichuan Medical College, Nanchong, 637000, Sichuan, China.
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16
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He M, Yue L, Wang H, Yu F, Yu M, Ni P, Zhang K, Chen S, Duan G, Zhang R. Evaluation of the prognostic value of CBXs in gastric cancer patients. Sci Rep 2021; 11:12375. [PMID: 34117289 PMCID: PMC8196000 DOI: 10.1038/s41598-021-91649-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 04/26/2021] [Indexed: 12/23/2022] Open
Abstract
Chromobox (CBX) proteins were suggested to exert epigenetic regulatory and transcriptionally repressing effects on target genes and might play key roles in the carcinogenesis of a variety of carcinomas. Nevertheless, the functions and prognostic significance of CBXs in gastric cancer (GC) remain unclear. The current study investigated the roles of CBXs in the prognosis of GC using the Oncomine, The Gene Expression Profiling Interactive Analysis (GEPIA), UALCAN, The Cancer Genome Atlas (TCGA), and cBioPortal databases. CBX1/2/3/4/5 were significantly upregulated in GC tissues compared with normal tissues, and CBX7 was downregulated. Multivariate analysis showed that high mRNA expression levels of CBX3/8 were independent prognostic factors for prolonged OS in GC patients. In addition, the genetic mutation rate of CBXs was 37% in GC patients, and genetic alterations in CBXs showed no association with OS or disease-free survival (DFS) in GC patients. These results indicated that CBX3/8 can be prognostic biomarkers for the survival of GC patients.
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Affiliation(s)
- Mengya He
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Limin Yue
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China.
| | - Haiyan Wang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Feiyan Yu
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Mingyang Yu
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Peng Ni
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Ke Zhang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Shuaiyin Chen
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China
| | - Guangcai Duan
- Department of Epidemiology, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China.
| | - Rongguang Zhang
- Department of Epidemiology, College of Public Health, Hainan Medical University, Longhua District, No.3 Xueyuan Road, Haikou, 570216, China. .,Department of Experimentation Center, College of Public Health, Zhengzhou University, No.100 Kexue Avenue, Zhengzhou, 450001, China.
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17
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Tao Q, Chen S, Liu J, Zhao P, Jiang L, Tu X, Tang X, Liu Z, Yasheng A, Tuerxun K, Zheng Y. The roles of the cell division cycle-associated gene family in hepatocellular carcinoma. J Gastrointest Oncol 2021; 12:781-794. [PMID: 34012666 DOI: 10.21037/jgo-21-110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Background The members of the cell division cycle-associated (CDCA) gene family are significant regulators of cell proliferation known to play key roles in various cancers. However, the function of CDCA genes in hepatocellular carcinoma (HCC) is unclear. The aim of this research was to clarify the roles of CDCA family members in HCC using bioinformatics analysis tools. Methods We studied data on the mRNA and protein expression of CDCA genes and survival in patients with HCC using the Oncomine, UALCAN, HPA, CCLE, LinkedOmics, cBioPortal, and Metascape databases. Results Significant overexpression of all CDCA members was found in HCC tissues. The expression levels of CDCAs were related to the tumor stage, and high expression levels were correlated with a low survival rate in patients with HCC. Also, we observed a high mutation rate (45%) of CDCAs in the HCC samples, which manifested as deep deletion, amplification, or increased mRNA expression. In the correlation analysis, we found that any 2 CDCA members were significantly positively correlated with each other. Cycle-related genes including AHCTF1, AKT1, BIRC5, CENPF, CENPL, and CENPQ were closely associated with CDCA gene alterations. Conclusions The findings of this study indicate that CDCAs may be potential therapeutic targets and prognostic indicators for patients with HCC.
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Affiliation(s)
- Qiang Tao
- The Second Department of General surgery, The First People's Hospital of Kashi Prefecture, Kashi, China.,State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Siliang Chen
- Department of Hematology, Peking University Shenzhen Hospital, Shenzhen, China
| | - Jia Liu
- Department of Neurology, The Seventh Affiliated Hospital of Sun Yat-Sen University, Shenzhen, China
| | - Peng Zhao
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Lingmin Jiang
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Xinyue Tu
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Xiang Tang
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Zonghao Liu
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Abudoukeyimu Yasheng
- The Second Department of General surgery, The First People's Hospital of Kashi Prefecture, Kashi, China
| | - Kahaer Tuerxun
- The Second Department of General surgery, The First People's Hospital of Kashi Prefecture, Kashi, China
| | - Yun Zheng
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China.,Department of Hepatobiliary Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
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18
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Ueda S, Kanda M, Sato Y, Baba H, Nakamura S, Sawaki K, Shimizu D, Motoyama S, Fujii T, Kodera Y, Nomoto S. Chromobox 2 Expression Predicts Prognosis After Curative Resection of Oesophageal Squamous Cell Carcinoma. Cancer Genomics Proteomics 2021; 17:391-400. [PMID: 32576584 DOI: 10.21873/cgp.20198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/06/2020] [Accepted: 04/07/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND/AIM To investigate the function of chromobox 2 (CBX2) in oesophageal squamous cell carcinoma (OSCC). MATERIALS AND METHODS We used real-time quantitative reverse transcription PCR (qRT-PCR) and immunohistochemistry to determine CBX2 expression levels in 13 human OSCC cell lines and clinical specimens of two independent cohorts of patients with OSCC. RESULTS PCR array analysis revealed that CBX2 was co-ordinately expressed with WNT5B in OSCC cell lines. RT-qPCR analysis of clinical samples revealed a high tumour-specific CBX2 expression compared with normal oesophageal tissues. High CBX2 expression was significantly associated with shorter disease-specific survival, hematogenous recurrence, and overall recurrence. Analysis of tissue microarrays of one cohort revealed that patients with higher CBX2 levels tended to have a shorter disease-specific survival. CONCLUSION CBX2 overexpression in OSCC tissues may serve as a novel biomarker for predicting survival and hematogenous recurrence.
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Affiliation(s)
- Sei Ueda
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Department of Maxillofacial Surgery, School of Dentistry, Aichi-gakuin University Graduate School of Medicine, Nagoya, Japan.,Department of Surgery, School of Dentistry, Aichi-gakuin University Graduate School of Medicine, Nagoya, Japan
| | - Mitsuro Kanda
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yusuke Sato
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Hayato Baba
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Department of Surgery and Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Shunsuke Nakamura
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Koichi Sawaki
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Dai Shimizu
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Satoru Motoyama
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Tsutomu Fujii
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Yasuhiro Kodera
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shuji Nomoto
- Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Department of Surgery, School of Dentistry, Aichi-gakuin University Graduate School of Medicine, Nagoya, Japan
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19
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Zeng M, Li B, Yang L, Guan Q. CBX2 depletion inhibits the proliferation, invasion and migration of gastric cancer cells by inactivating the YAP/β-catenin pathway. Mol Med Rep 2020; 23:137. [PMID: 33313949 PMCID: PMC7751489 DOI: 10.3892/mmr.2020.11776] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 11/05/2020] [Indexed: 12/11/2022] Open
Abstract
Gastric cancer (GC) is the most common and fast-growing malignancy of the digestive system, which has a high mortality. Chromobox homolog 2 (CBX2) has been reported to be highly expressed in cancer tissues compared with adjacent normal tissues. It has also been established that CBX2 is upregulated in GC cell lines by searching the Cancer Cell Line Encyclopedia. The aim of the present study was to investigate the biomolecular role and underlying mechanism of CBX2 in the proliferation, invasion and migration of GC cells. Short hairpin RNA-CBX2 and yes-associated protein (YAP) overexpression plasmids were constructed to regulate CBX2 and YAP expression, respectively. Additionally, the expression of certain mRNAs and proteins involved in the YAP/β-catenin pathway and those associated with cell invasion were assessed by western blotting and reverse transcription-quantitative PCR, respectively. The cellular behaviors of MFC cells were analyzed using Cell Counting Kit-8, colony formation wound-healing and Transwell assays. The results of the present study revealed that increased CBX2 expression was observed in GC cell lines compared with normal gastric cells. In addition, CBX2 knockdown inhibited the nuclear cytoplasm translocation of YAP, inducing its phosphorylation, and suppressing the activation of the β-catenin signaling pathway. The results also demonstrated that CBX2 depletion inhibited the proliferation, migration and invasion of GC cells by inactivating the YAP/β-catenin pathway. It was determined that CBX2 promoted the proliferation, invasion and migration of GC cells by activating the YAP/β-catenin pathway, suggesting that CBX2 is involved in the pathogenesis of GC and may represent a novel target for the clinical treatment of GC.
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Affiliation(s)
- Miaomiao Zeng
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Bangxue Li
- Department of Radiology, Lanzhou University Second Hospital, Lanzhou, Gansu 730000, P.R. China
| | - Lei Yang
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Quanlin Guan
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
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20
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Wang W, Li X, Guan C, Hu Z, Zhao Y, Li W, Jiang X. LncRNA PCAT6 promotes the proliferation, migration and invasion of pancreatic ductal adenocarcinoma via regulating miR-185-5p/CBX2 axis. Pathol Res Pract 2020; 216:153074. [PMID: 32825947 DOI: 10.1016/j.prp.2020.153074] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 05/31/2020] [Accepted: 06/17/2020] [Indexed: 12/18/2022]
Abstract
Emerging evidence has revealed markedly roles for long noncoding RNAs (lncRNAs) in various cancer processes. Prostate cancer associated transcript 6 (PCAT6) is a novel lncRNA which displays vital regulatory functions in multiple cancers. However, the functions of PCAT6 in pancreatic ductal adenocarcinoma (PDAC) remain unclear. Our study confirmed that PCAT6 expression was upregulated in PDAC and the expression of PCAT6 was related to TNM stage, lymph node invasion and overall survival of PDAC patients. PCAT6 might act as an effective tumor biomarker for PDAC patients. Moreover, knockdown of PCAT6 inhibited cell proliferation, migration and invasion of PDAC in vitro. For the mechanism, miR-185-5p expression was decreased and chromobox 2 (CBX2) expression was increased in PDAC, and further PCAT6 could upregulated the expression of oncogene CBX2 by sponging miR-185-5p. The results above suggested that PCAT6/miR-185-5p/CBX2 exerted crucial functions in tumorigenesis and progression of PDAC.
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Affiliation(s)
- Weina Wang
- Department of Anesthesiology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Xiang Li
- Department of General Surgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Canghai Guan
- Department of General Surgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Zengtao Hu
- Department of General Surgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Yuqiao Zhao
- Department of General Surgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Wenzhi Li
- Department of Anesthesiology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China.
| | - Xingming Jiang
- Department of General Surgery, The 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, China.
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21
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He YL, Zhang B. Clinical significance of expression of CBX2 in gastric cancer. Shijie Huaren Xiaohua Zazhi 2019; 27:872-877. [DOI: 10.11569/wcjd.v27.i14.872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The incidence of gastric cancer (GC) is high in recent years and it is very urgent to explore new targets for the diagnosis and treatment of GC.
AIM To investigate the expression and clinical significance of chromobox homolog 2 (CBX2) in GC cells and tissues.
METHODS The expression levels of CBX2 mRNA and protein in GC cells, normal gastric mucosal epithelial cells, GC tissues, and their adjacent normal tissues were detected by real-time fluorescent quantitative PCR and Western blot, respectively. The expression of CBX2 in 66 cases of GC and matched paracancerous tissues was detected by immunohistochemistry. The relationship between the expression of CBX2 and the clinicopathological features and prognosis of GC patients was analyzed.
RESULTS The expression of CBX2 mRNA in GC cells was higher than that in normal gastric mucosal epithelial cells (P < 0.05). The expression of CBX2 mRNA and protein in GC tissues was higher than that in adjacent tissues (P < 0.05). The positive expression rate of CBX2 in GC tissues was 40.9% (27/66), and it was 12.1% (8/66) in normal tissues adjacent to cancer. CBX2 was positively expressed in GC tissues. The expression rate was higher than that of adjacent tissues (P < 0.05). The expression of CBX2 protein was correlated with tumor metastasis (P < 0.05).
CONCLUSION CBX2 is overexpressed in GC cells and tissues, and it has a certain degree of connection with the prognosis and outcome of patients with GC.
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Affiliation(s)
- Yi-Lan He
- Department of Oncology, Third People's Hospital of Yuhang District, Hangzhou 311115, Zhejiang Province, China
| | - Bo Zhang
- Department of Oncology, Integrated Traditional Chinese and Western Medicine, Zhejiang Cancer Hospital, Hangzhou 310022, Zhejiang Province, China
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22
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Jangal M, Lebeau B, Witcher M. Beyond EZH2: is the polycomb protein CBX2 an emerging target for anti-cancer therapy? Expert Opin Ther Targets 2019; 23:565-578. [PMID: 31177918 DOI: 10.1080/14728222.2019.1627329] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: Epigenetic modifications are important regulators of transcription and appropriate gene expression answering an environmental stimulus. In cancer, these epigenetic modifications are altered, which impact the transcriptome, promoting initiation and cancer progression. Thus, targeting epigenetic machinery has proven to be an efficient cancer therapy. Areas covered: We review CBX2 as a therapeutic target. CBX2 is a polycomb protein, responsible for polycomb-repressive complex 1 (PRC1) targeting to chromatin via recognition of the repressive mark H3K27me3. Mechanistically, CBX2 overexpression may be implicated in poor survival by maintaining cancer stem cells in an undifferentiated state and via repression of tumor suppressors. We discuss strategies used to target CBX proteins and provide insights into biomarker considerations that may be important when targeting CBX family members for anti-cancer therapy. Expert opinion: CBX2 inhibition is a promising approach for the targeting of polycomb complexes in the cancer stem cell niche. However, extensive optimization of the current field of small molecules targeting CBX family proteins will be critical to reach in vivo, or clinical, utility.
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Affiliation(s)
- Maïka Jangal
- a The Lady Davis Institute of the Jewish General Hospital, Department of Oncology , McGill University , Montreal , Canada
| | - Benjamin Lebeau
- a The Lady Davis Institute of the Jewish General Hospital, Department of Oncology , McGill University , Montreal , Canada
| | - Michael Witcher
- a The Lady Davis Institute of the Jewish General Hospital, Department of Oncology , McGill University , Montreal , Canada
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23
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Mao J, Tian Y, Wang C, Jiang K, Li R, Yao Y, Zhang R, Sun D, Liang R, Gao Z, Wang Q, Wang L. CBX2 Regulates Proliferation and Apoptosis via the Phosphorylation of YAP in Hepatocellular Carcinoma. J Cancer 2019; 10:2706-2719. [PMID: 31258779 PMCID: PMC6584921 DOI: 10.7150/jca.31845] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 05/09/2019] [Indexed: 12/29/2022] Open
Abstract
Chromobox 2 (CBX2), a chromobox family protein, is a crucial component of the polycomb group complex: polycomb repressive complex 1 (PRC1). Research on CBX2 as an oncogene has been published in recent years. However, the connection between CBX2 and hepatocellular carcinoma (HCC) has not been studied. In this article, based on the results of immunohistochemical (IHC) staining of HCC and adjacent liver tissue microarrays, we found that high CBX2 expression is associated with poor prognosis in HCC patients. The results of a CCK8 assay, a clonogenic survival assay and a nude mouse tumorigenicity assay showed that knockdown of CBX2 inhibited the proliferation of HCC cells. According to the results of Annexin V-FITC/propidium iodide (PI) staining-based fluorescence activated cell sorting (FACS) analysis, knockdown of CBX2 increased HCC cell apoptosis. Furthermore, the RNA-seq results revealed that knockdown of CBX2 inhibited the expression of WTIP, which is an inhibitor of the Hippo pathway. We used western blotting to validate the mechanism and discovered that knockdown of CBX2 increased the phosphorylation of YAP, which explains why knockdown of CBX2 inhibits proliferation and increases apoptosis in HCC cells. In conclusion, CBX2 could be a potential target for HCC anticancer treatment.
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Affiliation(s)
- Jiakai Mao
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Yu Tian
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China.,Department of Vascular Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Chengye Wang
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Keqiu Jiang
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Rui Li
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Yifan Yao
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Rixin Zhang
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Deguang Sun
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Rui Liang
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Zhenming Gao
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Qi Wang
- Department of Pulmonary Medicine, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Liming Wang
- Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
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24
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Han Q, Li C, Cao Y, Bao J, Li K, Song R, Chen X, Li J, Wu X. CBX2 is a functional target of miRNA let-7a and acts as a tumor promoter in osteosarcoma. Cancer Med 2019; 8:3981-3991. [PMID: 31150156 PMCID: PMC6639449 DOI: 10.1002/cam4.2320] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 04/27/2019] [Accepted: 05/17/2019] [Indexed: 12/25/2022] Open
Abstract
Osteosarcoma is the most common type of primary malignant tumor of skeletal with poor prognosis in children and adolescents. Accumulating evidence indicates that CBX2 is overexpressed in multiple human neoplasm and play a critical role in tumorigenesis and progression. However, its functional role and upstream regulation mechanism in osteosarcoma remain unknown. In the present study, tissue microarray (TMA) analysis was performed to determine the association between CBX2 expression and clinical prognosis of osteosarcoma patients by immunohistochemistry. We also investigated the functional role of CBX2 using small interfering RNA (siRNA) in vitro and in vivo. Additionally, we confirmed the direct binding between CBX2 and let‐7a via qPCR, western blot and luciferase reporter assay. We found that CBX2 is dramatically upregulated in osteosarcoma tissues and high CBX2 expression was correlated with metastasis, recurrence, and chemotherapy response, as well as unfavorable prognosis in patients with osteosarcoma. Similar results were observed in a sarcoma cohort from The Cancer Genome Atlas (TCGA) dataset. Further experiments revealed that CBX2 knockdown significantly impeded osteosarcoma cell proliferation and invasion ability in vitro, and suppressed the tumor growth in tumor xenografts model. Mechanistically, we confirmed that CBX2 is a functional target of miRNA let‐7a. Overexpression of let‐7a inhibits osteosarcoma cell proliferation, which was reversed by CBX2 overexpression. Taken together, our study demonstrates that let‐7a/CBX2 plays a crucial role in osteosarcoma progression. CBX2 could serve as a promising prognostic biomarker and potential therapeutic target for osteosarcoma patients.
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Affiliation(s)
- Qicai Han
- Department of Bone and Soft Tissue, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Chao Li
- Department of Bone and Soft Tissue, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Yuan Cao
- Key Laboratory of Clinical Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jie Bao
- Key Laboratory of Clinical Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Kongfei Li
- Department of Hematology, Yinzhou People's Hospital affiliated to Medical College of Ningbo University, Ningbo, China
| | - Ruipeng Song
- Department of Bone and Soft Tissue, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xiaolong Chen
- Key Laboratory of Clinical Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Juan Li
- Key Laboratory of Clinical Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xuejian Wu
- Department of Bone and Soft Tissue, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Department of Bone and Soft Tissue, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China.,Key Laboratory of Clinical Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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25
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Piqué DG, Montagna C, Greally JM, Mar JC. A novel approach to modelling transcriptional heterogeneity identifies the oncogene candidate CBX2 in invasive breast carcinoma. Br J Cancer 2019; 120:746-753. [PMID: 30820027 PMCID: PMC6462018 DOI: 10.1038/s41416-019-0387-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 12/20/2018] [Accepted: 01/09/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Oncogenes promote the development of therapeutic targets against subsets of cancers. Only several hundred oncogenes have been identified, primarily via mutation-based approaches, in the human genome. Transcriptional overexpression is a less-explored mechanism through which oncogenes can arise. METHODS Here, a new statistical approach, termed oncomix, which captures transcriptional heterogeneity in tumour and adjacent normal (i.e., tumour-free) mRNA expression profiles, was developed to identify oncogene candidates that were overexpressed in a subset of breast tumours. RESULTS Intronic DNA methylation was strongly associated with the overexpression of chromobox 2 (CBX2), an oncogene candidate that was identified using our method but not through prior analytical approaches. CBX2 overexpression in breast tumours was associated with the upregulation of genes involved in cell cycle progression and with poorer 5-year survival. The predicted function of CBX2 was confirmed in vitro, providing the first experimental evidence that CBX2 promotes breast cancer cell growth. CONCLUSIONS Oncomix is a novel approach that captures transcriptional heterogeneity between tumour and adjacent normal tissue, and that has the potential to uncover therapeutic targets that benefit subsets of cancer patients. CBX2 is an oncogene candidate that should be further explored as a potential drug target for aggressive types of breast cancer.
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Affiliation(s)
- Daniel G Piqué
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA.,Department of Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
| | - Cristina Montagna
- Department of Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
| | - John M Greally
- Department of Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA.
| | - Jessica C Mar
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA. .,Department of Epidemiology and Population Health, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA. .,Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland, QLD, 4072, Australia.
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26
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CBX6 is negatively regulated by EZH2 and plays a potential tumor suppressor role in breast cancer. Sci Rep 2019; 9:197. [PMID: 30655550 PMCID: PMC6336801 DOI: 10.1038/s41598-018-36560-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 11/22/2018] [Indexed: 12/21/2022] Open
Abstract
Chromobox 6 (CBX6) is a subunit of Polycomb Repressive Complex 1 (PRC1) that mediates epigenetic gene repression and acts as an oncogene or tumor suppressor in a cancer type-dependent manner. The specific function of CBX6 in breast cancer is currently undefined. In this study, a comprehensive analysis of The Cancer Genome Atlas (TCGA) dataset led to the identification of CBX6 as a consistently downregulated gene in breast cancer. We provided evidence showing enhancer of zeste homolog 2 (EZH2) negatively regulated CBX6 expression in a Polycomb Repressive Complex 2 (PRC2)-dependent manner. Exogenous overexpression of CBX6 inhibited cell proliferation and colony formation, and induced cell cycle arrest along with suppression of migration and invasion of breast cancer cells in vitro. Microarray analyses revealed that CBX6 governs a complex gene expression program. Moreover, CBX6 induced significant downregulation of bone marrow stromal cell antigen-2 (BST2), a potential therapeutic target, via interactions with its promoter region. Our collective findings support a tumor suppressor role of CBX6 in breast cancer.
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27
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Sun D, Cao X, Wang C. Polycomb chromobox Cbx2 enhances antiviral innate immunity by promoting Jmjd3-mediated demethylation of H3K27 at the Ifnb promoter. Protein Cell 2018; 10:285-294. [PMID: 30357595 PMCID: PMC6418077 DOI: 10.1007/s13238-018-0581-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 09/28/2018] [Indexed: 12/18/2022] Open
Abstract
Polycomb chromobox (CBX) proteins regulate gene transcription by maintaining chromatin states, which guide a variety of biological processes. Now, epigenetic regulation of innate immune response is an emerging field. However, the role of CBX proteins in innate immunity remains unclear. We confirmed that the expression of CBX family proteins, especially Cbx2, was decreased in macrophages upon viral infection, and then we investigated the role of Cbx2 in the antiviral immune response. Silencing or knockdown of Cbx2 in macrophages inhibited virus-induced production of IFN-β. Furthermore, heterozygous Cbx2 knockout were susceptible to VSV challenge. Mechanistically, Cbx2 binds to and recruits Jmjd3 to the Ifnb promoter, leading to demethylation of H3K27me3 and increased transcription of IFN-β. Together, our study reveals a non-traditional function of a Cbx protein and adds new insight into the epigenetic regulation of antiviral innate immunity.
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Affiliation(s)
- Donghao Sun
- Department of Immunology and Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100005, China
| | - Xuetao Cao
- Department of Immunology and Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100005, China
| | - Chunmei Wang
- Department of Immunology and Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100005, China.
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28
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Fu D, Li J, Wei J, Zhang Z, Luo Y, Tan H, Ren C. HMGB2 is associated with malignancy and regulates Warburg effect by targeting LDHB and FBP1 in breast cancer. Cell Commun Signal 2018; 16:8. [PMID: 29463261 PMCID: PMC5819211 DOI: 10.1186/s12964-018-0219-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 02/14/2018] [Indexed: 12/19/2022] Open
Abstract
Background High-mobility group box 2 (HMGB2) is implicated in tumorigenesis in various cancers. However, the clinical significance of HMGB2 signaling in human breast cancer progression remains unknown. Methods We investigated HMGB2 expression in 185 cases of primary breast cancer and matched normal breast tissue specimens, and explored the underlying mechanisms of altered HMGB2 expression as well as the impact of this altered expression on breast cancer growth and on aerobic glycolysis using in vitro and animal models of breast cancer. Results HMGB2 was more highly expressed in tumor-cell nuclei of breast cancer cells than in the adjacent normal breast tissues (P < 0.05). Higher HMGB2 expression correlated with larger tumor size (P = 0.003) and advanced tumor stage (P = 0.033). A Cox proportional hazards model revealed that HMGB2 expression was an independent prognostic factor for breast cancer after radical resection (P < 0.05). Experimentally, knockdown of HMGB2 expression by stable transfected shRNA significantly decreased the growth and glycolysis of breast cancer cells both in vitro and in mouse models. Mechanically, promotion of breast cancer progression by HMGB2 directly and significantly correlated with activation of LDHB expression and inactivation of FBP1 expression. Conclusions These results disclose a novel role for HMGB2 in reprogramming the metabolic process in breast cancer cells by targeting LDHB and FBP1 and provide potential prognostic predictors for breast cancer patients.
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Affiliation(s)
- Deyuan Fu
- Department of Thyroid and Breast Surgery, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, No.98 Nantong West Road, Yangzhou, 225001, China.
| | - Jing Li
- Departments of CyberKnife, Huashan Hospital, Fudan University, No.525,Hongfeng Road, Shanghai, 200032, China.,Departments of CyberKnife, Huashan Hospital, Fudan University, No.525,Hongfeng Road, Shanghai, 201206, China
| | - Jinli Wei
- Department of Thyroid and Breast Surgery, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, No.98 Nantong West Road, Yangzhou, 225001, China
| | - Zhengquan Zhang
- Department of Thyroid and Breast Surgery, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, No.98 Nantong West Road, Yangzhou, 225001, China
| | - Yulin Luo
- Department of Thyroid and Breast Surgery, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, No.98 Nantong West Road, Yangzhou, 225001, China
| | - Haosheng Tan
- Department of Thyroid and Breast Surgery, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, No.98 Nantong West Road, Yangzhou, 225001, China
| | - Chuanli Ren
- The Clinical Medical Testing Laboratory, Northern Jiangsu People's Hospital and Clinical Medical College of Yangzhou University, Yangzhou, 225001, China
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29
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Liang YK, Lin HY, Chen CF, Zeng D. Prognostic values of distinct CBX family members in breast cancer. Oncotarget 2017; 8:92375-92387. [PMID: 29190923 PMCID: PMC5696189 DOI: 10.18632/oncotarget.21325] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 08/17/2017] [Indexed: 02/05/2023] Open
Abstract
Chromobox (CBX) family proteins are canonical components in polycomb repressive complexes 1 (PRC1), with epigenetic regulatory function and transcriptionally repressing target genes via chromatin modification. A plethora of studies have highlighted the function specifications among CBX family members in various cancer, including lung cancer, colon cancer and breast cancer. Nevertheless, the functions and prognostic roles of distinct CBX family members in breast cancer (BC) remain elusive. In this study, we reported the prognostic values of CBX family members in patients with BC through analysis of a series of databases, including CCLE, ONCOMINE, Xena Public Data Hubs, and Kaplan-Meier plotter. It was found that the mRNA expression of CBX family members were noticeably higher in BC than normal counterparts. CBX2 was highly expressed in Basal-like and HER-2 subtypes, while CBX4 and CBX7 expressions were enriched in Luminal A and Luminal B subtypes of BC. Survival analysis revealed that CBX1, CBX2 and CBX3 mRNA high expression was correlated to worsen relapse-free survival (RFS) for all BC patients, while CBX4, CBX5, CBX6 and CBX7 high expression was correlated to better RFS in this setting. Noteworthily, CBX1 and CBX2 were associated with chemoresistance whereas CBX7 was associated with tamoxifen sensitivity, as well as chemosensitivity in breast tumors. Therefore, we propose that CBX1, CBX2 and CBX7 are potential targets for BC treatment. The results might be beneficial for better understanding the complexity and heterogeneity in the molecular underpinning of BC, and to develop tools to more accurately predict the prognosis of patients with BC.
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Affiliation(s)
- Yuan-Ke Liang
- The Breast Center, Cancer Hospital of Shantou University Medical College, Shantou, China
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Hao-Yu Lin
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Chun-Fa Chen
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - De Zeng
- Department of Medical Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
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