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Ahuja N, Ashok C, Natua S, Pant D, Cherian A, Pandkar MR, Yadav P, Vishnu NSS, Mishra J, Samaiya A, Shukla S. Hypoxia-induced TGF-β-RBFOX2-ESRP1 axis regulates human MENA alternative splicing and promotes EMT in breast cancer. NAR Cancer 2020; 2:zcaa021. [PMID: 33089214 PMCID: PMC7116222 DOI: 10.1093/narcan/zcaa021] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Hypoxic microenvironment heralds epithelial-mesenchymal transition (EMT), invasion and metastasis in solid tumors. Deregulation of alternative splicing (AS) of several cancer-associated genes has been instrumental in hypoxia-induced EMT. Our study in breast cancer unveils a previously unreported mechanism underlying hypoxia-mediated AS of hMENA, a crucial cytoskeleton remodeler during EMT. We report that the hypoxia-driven depletion of splicing regulator ESRP1 leads to skipping of hMENA exon 11a producing a pro-metastatic isoform, hMENAΔ11a. The transcriptional repression of ESRP1 is mediated by SLUG, which gets stimulated via hypoxia-driven TGF-β signaling. Interestingly, RBFOX2, an otherwise RNA-binding protein, is also found to transcriptionally repress ESRP1 while interacting with SLUG. Similar to SLUG, RBFOX2 gets upregulated under hypoxia via TGF-β signaling. Notably, we found that the exosomal delivery of TGF-β contributes to the elevation of TGF-β signaling under hypoxia. Moreover, our results show that in addition to hMENA, hypoxia-induced TGF-β signaling contributes to global changes in AS of genes associated with EMT. Overall, our findings reveal a new paradigm of hypoxia-driven AS regulation of hMENA and insinuate important implications in therapeutics targeting EMT.
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Affiliation(s)
- Neha Ahuja
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Cheemala Ashok
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Subhashis Natua
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Deepak Pant
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Anna Cherian
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Madhura R Pandkar
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Pooja Yadav
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Narayanan S S Vishnu
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Jharna Mishra
- Department of Pathology, Bansal Hospital, Bhopal, Madhya Pradesh 462016, India
| | - Atul Samaiya
- Department of Surgical Oncology, Bansal Hospital, Bhopal, Madhya Pradesh 462016, India
| | - Sanjeev Shukla
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
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Debaugny RE, Skok JA. CTCF and CTCFL in cancer. Curr Opin Genet Dev 2020; 61:44-52. [PMID: 32334335 PMCID: PMC7893514 DOI: 10.1016/j.gde.2020.02.021] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/11/2020] [Accepted: 02/22/2020] [Indexed: 12/28/2022]
Abstract
CTCF plays a key role in organizing chromatin into TAD structures but it can also function as a transcription factor. CTCFL (CTCF-like), the paralog of CTCF, is normally transiently expressed in pre-meiotic male germ cells together with ubiquitously expressed CTCF. It plays a unique role in spermatogenesis by regulating expression of testis-specific genes. Genetic alterations in CTCF and its paralog CTCFL have both been found in numerous cancers, but it remains unknown to what extent CTCFL deregulates transcription on its own or by opposing CTCF. Here, we discuss some of the potential mechanisms by which these two proteins could alter gene regulation and contribute to oncogenic transcriptional programs.
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Affiliation(s)
- Roxanne E Debaugny
- Dept. of Pathology, New York University Langone Health, New York, NY 10016, USA
| | - Jane A Skok
- Dept. of Pathology, New York University Langone Health, New York, NY 10016, USA; Laura and Isaac Perlmutter Cancer Center, NYU School of Medicine, New York, NY 10016, USA.
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Soltanian S, Dehghani H. BORIS: a key regulator of cancer stemness. Cancer Cell Int 2018; 18:154. [PMID: 30323717 PMCID: PMC6173857 DOI: 10.1186/s12935-018-0650-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 09/27/2018] [Indexed: 02/07/2023] Open
Abstract
BORIS (CTCFL) is a DNA binding protein which is involved in tumorigenesis. Although, there are different opinions on the level of gene expression and function of BORIS in normal and cancer tissues, the results of many studies have classified BORIS as a protein belonging to cancer/testis (CT) genes, which are identified as a group of genes that are expressed normally in testis, and abnormally in various types of cancers. In testis, BORIS induces the expression of some male germ cell/testis specific genes, and plays crucial roles during spermatogenesis and production of sperm. In tumorigenesis, the role of BORIS in the expression induction of some CT genes and oncogenes, as well as increasing proliferation/viability of cancer cells has been demonstrated in many researches. In addition to cancer cells, some believe that BORIS is also expressed in normal conditions and plays a universal function in cell division and regulation of genes. The following is a comprehensive review on contradictory views on the expression pattern and biological function of BORIS in normal, as well as cancer cells/tissues, and presents some evidence that support the expression of BORIS in cancer stem cells (CSCs) and advanced stage/poorer differentiation grade of cancers. Boris is involved in the regulation of CSC cellular and molecular features such as self-renewal, chemo-resistance, tumorigenicity, sphere-forming ability, and migration capacity. Finally, the role of BORIS in regulating two important signaling pathways including Wnt/β-catenin and Notch in CSCs, and its ability in recruiting transcription factors or chromatin-remodeling proteins to induce tumorigenesis is discussed.
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Affiliation(s)
- Sara Soltanian
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Hesam Dehghani
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Azadi Square, Mashhad, 91775-1793 Iran
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
- Stem Cells and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
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Lee WYJ, Fu RM, Liang C, Sloan RD. IFITM proteins inhibit HIV-1 protein synthesis. Sci Rep 2018; 8:14551. [PMID: 30266929 PMCID: PMC6162285 DOI: 10.1038/s41598-018-32785-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 09/11/2018] [Indexed: 01/23/2023] Open
Abstract
Interferon induced transmembrane proteins (IFITMs) inhibit the cellular entry of a broad range of viruses, but it has been suspected that for HIV-1 IFITMs may also inhibit a post-integration replicative step. We show that IFITM expression reduces HIV-1 viral protein synthesis by preferentially excluding viral mRNA transcripts from translation and thereby restricts viral production. Codon-optimization of proviral DNA rescues viral translation, implying that IFITM-mediated restriction requires recognition of viral RNA elements. In addition, we find that expression of the viral accessory protein Nef can help overcome the IFITM-mediated inhibition of virus production. Our studies identify a novel role for IFITMs in inhibiting HIV replication at the level of translation, but show that the effects can be overcome by the lentiviral protein Nef.
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Affiliation(s)
- Wing-Yiu Jason Lee
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, United Kingdom
| | - Rebecca Menhua Fu
- Division of Infection and Pathway Medicine, School of Biomedical Sciences, University of Edinburgh, Edinburgh, EH16 4SB, United Kingdom
| | - Chen Liang
- McGill University AIDS Centre, Lady Davis Institute, Montreal, Quebec, H3T 1E2, Canada
| | - Richard D Sloan
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, United Kingdom.
- Division of Infection and Pathway Medicine, School of Biomedical Sciences, University of Edinburgh, Edinburgh, EH16 4SB, United Kingdom.
- ZJU-UoE Institute, Zhejiang University, Haining, Zhejiang, 314400, P.R. China.
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Zhang Y, Fang M, Song Y, Ren J, Fang J, Wang X. Brother of Regulator of Imprinted Sites (BORIS) suppresses apoptosis in colorectal cancer. Sci Rep 2017; 7:40786. [PMID: 28098226 PMCID: PMC5241680 DOI: 10.1038/srep40786] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 12/09/2016] [Indexed: 11/09/2022] Open
Abstract
Identifying oncogenes that promote cancer cell proliferation or survival is critical for treatment of colorectal cancer. The Brother of Regulator of Imprinted Sites (BORIS) is frequently expressed in most types of cancer, but rarely in normal tissues. Aberrantly expressed BORIS relates to colorectal cancer, but its function in colorectal cancer cells remains unclear. In addition, previous studies indicated the significance of cytoplasm-localized BORIS in cancer cells. However, none of them investigated its function. Herein, we investigated the functions of BORIS in cancer cell proliferation and apoptosis and the role of cytoplasm-localized BORIS in colorectal cancer. BORIS expression correlated with colorectal cancer proliferation. BORIS overexpression promoted colorectal cancer cell growth, whereas BORIS knockdown suppressed cell proliferation. Sensitivity of colorectal cancer cells to 5-fluorouracil (5-FU) was inversely correlated with BORIS expression. These data suggest that BORIS functions as an oncogene in colorectal cancer. BORIS silencing induced reactive oxygen species (ROS) production and apoptosis, whereas BORIS supplementation inhibited apoptosis induced by BORIS short interfering RNA (siRNA), hydrogen peroxide (H2O2) or 5-FU. Introduction of BORIS-ZFdel showed that cytoplasmic localization of BORIS inhibited apoptosis but not ROS production. Our study highlights the anti-apoptotic function of BORIS in colorectal cancer.
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Affiliation(s)
- Yanmei Zhang
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
| | - Mengdie Fang
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
| | - Yongfei Song
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
| | - Juan Ren
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
| | - Jianfei Fang
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
| | - Xiaoju Wang
- Center for Molecular Medicine, Zhejiang Academy of Medical Science, Hangzhou, Zhejiang Province, 310012, P.R. China
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Shigunov P, Dallagiovanna B. Stem Cell Ribonomics: RNA-Binding Proteins and Gene Networks in Stem Cell Differentiation. Front Mol Biosci 2015; 2:74. [PMID: 26734617 PMCID: PMC4686646 DOI: 10.3389/fmolb.2015.00074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 12/07/2015] [Indexed: 12/21/2022] Open
Abstract
Stem cells are undifferentiated cells with the ability to self-renew and the potential to differentiate into all body cell types. Stem cells follow a developmental genetic program and are able to respond to alterations in the environment through various signaling pathways. The mechanisms that control these processes involve the activation of transcription followed by a series of post-transcriptional events. These post-transcriptional steps are mediated by the interaction of RNA-binding proteins (RBPs) with defined subpopulations of RNAs creating a regulatory gene network. Characterizing these RNA-protein networks is essential to understanding the regulatory mechanisms underlying the control of stem cell fate. Ribonomics is the combination of classical biochemical purification protocols with the high-throughput identification of transcripts applied to the functional characterization of RNA-protein complexes. Here, we describe the different approaches that can be used in a ribonomic approach and how they have contributed to understanding the function of several RBPs with central roles in stem cell biology.
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Affiliation(s)
- Patrícia Shigunov
- Stem Cells Basic Biology Laboratory, Carlos Chagas Institute, Oswaldo Cruz Foundation Curitiba, Brazil
| | - Bruno Dallagiovanna
- Stem Cells Basic Biology Laboratory, Carlos Chagas Institute, Oswaldo Cruz Foundation Curitiba, Brazil
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