101
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Wang Q, Hu SC, Yang CS, Chen JC, Zheng JN, Sun XQ, Wang JQ. Inhibition of prostate cancer cell growth in vivo with short hairpin RNA targeting SATB1. Oncol Lett 2017; 14:6592-6596. [PMID: 29151908 PMCID: PMC5678242 DOI: 10.3892/ol.2017.7006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 05/16/2017] [Indexed: 01/18/2023] Open
Abstract
Despite previous advances, the treatment options for prostate cancer remain limited. For the purposes of gene knockdown, the utility of RNA interference has been demonstrated and is considered to have therapeutic potential. In the present study, a short hairpin RNA (shRNA) was used to assess the effect of special AT-rich sequence binding protein (SATB1) downregulation on the growth and metastatic potential of prostate cancer in xenograft nude mice. A plasmid carrying shRNA targeting SATB1, pSilencer-SATB1-shRNA, was successfully engineered. Using this plasmid, significant downregulation of SATB1 mRNA and protein expression in the DU145 prostate cancer cells was observed. pSilencer-SATB1-shRNA was demonstrated to be markedly efficacious against prostate cancer xenografts in nude mice. These results may lead to a novel method of improving gene therapy efficacy against prostate cancer via regulating the function of SATB1.
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Affiliation(s)
- Qiang Wang
- The First Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210046, P.R. China
| | - Shi-Cheng Hu
- Department of Urology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, P.R. China
| | - Chun-Sheng Yang
- Department of Dermatology, Affiliated Huai'an Hospital of Xuzhou Medical University, The Second People's Hospital of Huai'an, Huai'an 223002, P.R. China
| | - Jia-Cun Chen
- Department of Urology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, P.R. China
| | - Jun-Nian Zheng
- Center of Clinical Oncology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, P.R. China
| | - Xiao-Qing Sun
- Department of Urology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, P.R. China
| | - Jun-Qi Wang
- Department of Urology, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, P.R. China
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102
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Stephen TL, Payne KK, Chaurio RA, Allegrezza MJ, Zhu H, Perez-Sanz J, Perales-Puchalt A, Nguyen JM, Vara-Ailor AE, Eruslanov EB, Borowsky ME, Zhang R, Laufer TM, Conejo-Garcia JR. SATB1 Expression Governs Epigenetic Repression of PD-1 in Tumor-Reactive T Cells. Immunity 2017; 46:51-64. [PMID: 28099864 DOI: 10.1016/j.immuni.2016.12.015] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/07/2016] [Accepted: 12/06/2016] [Indexed: 12/16/2022]
Abstract
Despite the importance of programmed cell death-1 (PD-1) in inhibiting T cell effector activity, the mechanisms regulating its expression remain poorly defined. We found that the chromatin organizer special AT-rich sequence-binding protein-1 (Satb1) restrains PD-1 expression induced upon T cell activation by recruiting a nucleosome remodeling deacetylase (NuRD) complex to Pdcd1 regulatory regions. Satb1 deficienct T cells exhibited a 40-fold increase in PD-1 expression. Tumor-derived transforming growth factor β (Tgf-β) decreased Satb1 expression through binding of Smad proteins to the Satb1 promoter. Smad proteins also competed with the Satb1-NuRD complex for binding to Pdcd1 enhancers, releasing Pdcd1 expression from Satb1-mediated repression, Satb1-deficient tumor-reactive T cells lost effector activity more rapidly than wild-type lymphocytes at tumor beds expressing PD-1 ligand (CD274), and these differences were abrogated by sustained CD274 blockade. Our findings suggest that Satb1 functions to prevent premature T cell exhaustion by regulating Pdcd1 expression upon T cell activation. Dysregulation of this pathway in tumor-infiltrating T cells results in diminished anti-tumor immunity.
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Affiliation(s)
- Tom L Stephen
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Kyle K Payne
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Ricardo A Chaurio
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Michael J Allegrezza
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Hengrui Zhu
- Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Jairo Perez-Sanz
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Alfredo Perales-Puchalt
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Jenny M Nguyen
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Ana E Vara-Ailor
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Evgeniy B Eruslanov
- Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Mark E Borowsky
- Helen F. Graham Cancer Center, Christiana Care Health System, 4701 Ogletown-Stanton Road, Newark, DE 19713, USA
| | - Rugang Zhang
- Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, PA 19104, USA
| | - Terri M Laufer
- Department of Rheumatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jose R Conejo-Garcia
- Tumor Microenvironment and Metastasis Program, The Wistar Institute, Philadelphia, PA 19104, USA.
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103
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LncSHRG promotes hepatocellular carcinoma progression by activating HES6. Oncotarget 2017; 8:70630-70641. [PMID: 29050307 PMCID: PMC5642582 DOI: 10.18632/oncotarget.19906] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 07/12/2017] [Indexed: 12/19/2022] Open
Abstract
Hepatocellular carcinoma, one of the most common cancers, leads to mass mortality worldwide currently. However, the underlying mechanism of its oncogenesis remains to be elucidated. Here we identified that a long noncoding RNA, lncSHRG, was greatly upregulated in human hepatocellular carcinoma samples. We found that lncSHRG was essential for liver cancer cell proliferation and tumor propagation in mice. In mechanism, lncSHRG recruits SATB1 to bind to HES6 promoter and initiates HES6 expression. HES6, which is highly expressed in hepatocellular carcinoma, promotes tumor cell proliferation. High expression level of HES6 is positively correlated with clinical severity and poor prognosis of people with hepatocellular carcinoma. Altogether, our research provides a new insight on the mechanism of hepatocellular carcinoma progression.
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104
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Lee K, Seo PJ. Coordination of matrix attachment and ATP-dependent chromatin remodeling regulate auxin biosynthesis and Arabidopsis hypocotyl elongation. PLoS One 2017; 12:e0181804. [PMID: 28746399 PMCID: PMC5529009 DOI: 10.1371/journal.pone.0181804] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/09/2017] [Indexed: 01/08/2023] Open
Abstract
Hypocotyl elongation is extensively controlled by hormone signaling networks. In particular, auxin metabolism and signaling play key roles in light-dependent hypocotyl growth. The nuclear matrix facilitates organization of DNA within the nucleus, and dynamic interactions between nuclear matrix and DNA are related to gene regulation. Conserved scaffold/matrix attachment regions (S/MARs) are anchored to the nuclear matrix by the AT-HOOK MOTIF CONTAINING NUCLEAR LOCALIZED (AHL) proteins in Arabidopsis. Here, we found that ESCAROLA (ESC)/AHL27 and SUPPRESSOR OF PHYTOCHROME B-4 #3 (SOB3)/AHL29 redundantly regulate auxin biosynthesis in the control of hypocotyl elongation. The light-inducible AHL proteins bind directly to an S/MAR region of the YUCCA 9 (YUC9) promoter and suppress its expression to inhibit hypocotyl growth in light-grown seedlings. In addition, they recruit the SWI2/SNF2-RELATED 1 (SWR1) complex and promote exchange of H2A with the histone variant H2A.Z at the YUC9 locus to further elaborately control auxin biosynthesis. Consistent with these results, the long hypocotyl phenotypes of light-grown genetic mutants of the AHLs and H2A.Z-exchanging components were suppressed by potent chemical inhibitors of auxin transport and YUC enzymes. These results suggest that the coordination of matrix attachment and chromatin modification underlies auxin biosynthesis in light-dependent hypocotyl growth.
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Affiliation(s)
- Kyounghee Lee
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Republic of Korea
| | - Pil Joon Seo
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Republic of Korea
- * E-mail:
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105
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Essential Roles of SATB1 in Specifying T Lymphocyte Subsets. Cell Rep 2017; 19:1176-1188. [DOI: 10.1016/j.celrep.2017.04.038] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 03/24/2017] [Accepted: 04/13/2017] [Indexed: 01/15/2023] Open
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106
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Goolam M, Zernicka-Goetz M. The chromatin modifier Satb1 regulates cell fate through Fgf signalling in the early mouse embryo. Development 2017; 144:1450-1461. [PMID: 28289135 PMCID: PMC5399666 DOI: 10.1242/dev.144139] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 03/03/2017] [Indexed: 02/01/2023]
Abstract
The separation of embryonic from extra-embryonic tissues within the inner cell mass to generate the epiblast (EPI), which will form the new organism, from the primitive endoderm (PE), which will form the yolk sac, is a crucial developmental decision. Here, we identify a chromatin modifier, Satb1, with a distinct role in this decision. Satb1 is differentially expressed within 16-cell-stage embryos, with higher expression levels in the inner cell mass progenitor cells. Depleting Satb1 increases the number of EPI cells at the expense of PE. This phenotype can be rescued by simultaneous depletion of both Satb1 and Satb2, owing to their antagonistic effect on the pluripotency regulator Nanog. Consequently, increasing Satb1 expression leads to differentiation into PE and a decrease in EPI, as a result of the modulation of expression of several pluripotency- and differentiation-related genes by Satb1. Finally, we show that Satb1 is a downstream target of the Fgf signalling pathway, linking chromatin modification and Fgf signalling. Together, these results identify a role for Satb1 in the lineage choice between pluripotency and differentiation and further our understanding of early embryonic lineage segregation.
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Affiliation(s)
- Mubeen Goolam
- Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Magdalena Zernicka-Goetz
- Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
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107
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Ma J, Wu K, Zhao Z, Miao R, Xu Z. Special AT-rich sequence binding protein 1 promotes tumor growth and metastasis of esophageal squamous cell carcinoma. Tumour Biol 2017; 39:1010428317694537. [PMID: 28345457 DOI: 10.1177/1010428317694537] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Esophageal squamous cell carcinoma is one of the most aggressive malignancies worldwide. Special AT-rich sequence binding protein 1 is a nuclear matrix attachment region binding protein which participates in higher order chromatin organization and tissue-specific gene expression. However, the role of special AT-rich sequence binding protein 1 in esophageal squamous cell carcinoma remains unknown. In this study, western blot and quantitative real-time polymerase chain reaction analysis were performed to identify differentially expressed special AT-rich sequence binding protein 1 in a series of esophageal squamous cell carcinoma tissue samples. The effects of special AT-rich sequence binding protein 1 silencing by two short-hairpin RNAs on cell proliferation, migration, and invasion were assessed by the CCK-8 assay and transwell assays in esophageal squamous cell carcinoma in vitro. Special AT-rich sequence binding protein 1 was significantly upregulated in esophageal squamous cell carcinoma tissue samples and cell lines. Silencing of special AT-rich sequence binding protein 1 inhibited the proliferation of KYSE450 and EC9706 cells which have a relatively high level of special AT-rich sequence binding protein 1, and the ability of migration and invasion of KYSE450 and EC9706 cells was distinctly suppressed. Special AT-rich sequence binding protein 1 could be a potential target for the treatment of esophageal squamous cell carcinoma and inhibition of special AT-rich sequence binding protein 1 may provide a new strategy for the prevention of esophageal squamous cell carcinoma invasion and metastasis.
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Affiliation(s)
- Jun Ma
- Department of Thoracic Surgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, P.R. China
| | - Kaiming Wu
- Department of Colorectal Surgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, P.R. China
| | - Zhenxian Zhao
- Department of Pancreato-Biliary Surgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, P.R. China
| | - Rong Miao
- Operation Centre, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, P.R. China
| | - Zhe Xu
- Division of Cardiac Surgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, P.R. China
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108
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Liu B, Ye B, Yang L, Zhu X, Huang G, Zhu P, Du Y, Wu J, Qin X, Chen R, Tian Y, Fan Z. Long noncoding RNA lncKdm2b is required for ILC3 maintenance by initiation of Zfp292 expression. Nat Immunol 2017; 18:499-508. [PMID: 28319097 DOI: 10.1038/ni.3712] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/16/2017] [Indexed: 12/14/2022]
Abstract
Innate lymphoid cells (ILCs) communicate with other hematopoietic and nonhematopoietic cells to regulate immunity, inflammation and tissue homeostasis. How ILC lineages develop and are maintained remains largely unknown. In this study we observed that a divergent long noncoding RNA (lncRNA), lncKdm2b, was expressed at high levels in intestinal group 3 ILCs (ILC3s). LncKdm2b deficiency in the hematopoietic system led to reductions in the number and effector functions of ILC3s. LncKdm2b expression sustained the maintenance of ILC3s by promoting their proliferation through activation of the transcription factor Zfp292. Mechanistically, lncKdm2b recruited the chromatin organizer Satb1 and the nuclear remodeling factor (NURF) complex onto the Zfp292 promoter to initiate its transcription. Deletion of Zfp292 or Bptf also abrogated the maintenance of ILC3s, leading to susceptibility to bacterial infection. Therefore, our findings reveal that lncRNAs may represent an additional layer of regulation of ILC development and function.
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Affiliation(s)
- Benyu Liu
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Buqing Ye
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Liuliu Yang
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xiaoxiao Zhu
- Key Laboratory of RNA Biology of CAS, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Guanling Huang
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Pingping Zhu
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Ying Du
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Jiayi Wu
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xiwen Qin
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Runsheng Chen
- University of Chinese Academy of Sciences, Beijing, China.,Key Laboratory of RNA Biology of CAS, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Yong Tian
- University of Chinese Academy of Sciences, Beijing, China.,Key Laboratory of RNA Biology of CAS, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Zusen Fan
- Key Laboratory of Infection and Immunity of CAS, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
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109
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Tetramerization of SATB1 is essential for regulating of gene expression. Mol Cell Biochem 2017; 430:171-178. [PMID: 28205095 DOI: 10.1007/s11010-017-2964-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 01/30/2017] [Indexed: 02/06/2023]
Abstract
Special AT-rich sequence-binding protein 1 (SATB1) functions as a 'genome organizer' in tumorigenesis. Our previous report showed that SATB1 forms a tetramer through its N-terminal ubiquitin like domain rather than the proposed PDZ domain. In the present study, we aim to illustrate whether this oligomerization is critical to its function as a global repressor of gene expression in vivo. Luciferase and GST pull-down assays demonstrated that disrupting SATB1's tetramerization not only affects the activities of promoters but also influences the recruitment of interaction partners. Furthermore, we developed stable cell lines that overexpressed either the SATB1 tetramer or STAB1 dimer (KWN-AAA) and monitored global gene expression. Gene expression profiling revealed that over 1000 genes were significantly upregulated or downregulated upon the overexpression of SATB1 or the SATB1 (KWN-AAA) mutant. These data implied that SATB1 might regulate gene expression through its different oligomerization state. In conclusion, we inferred that the oligomerization of SATB1 is pivotal to its function of different biological processes.
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110
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Zhang P, Torres K, Liu X, Liu CG, Pollock RE. An Overview of Chromatin-Regulating Proteins in Cells. Curr Protein Pept Sci 2017; 17:401-10. [PMID: 26796306 DOI: 10.2174/1389203717666160122120310] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 12/25/2015] [Accepted: 12/30/2015] [Indexed: 12/13/2022]
Abstract
In eukaryotic cells, gene expressions on chromosome DNA are orchestrated by a dynamic chromosome structure state that is largely controlled by chromatin-regulating proteins, which regulate chromatin structures, release DNA from the nucleosome, and activate or suppress gene expression by modifying nucleosome histones or mobilizing DNA-histone structure. The two classes of chromatinregulating proteins are 1) enzymes that modify histones through methylation, acetylation, phosphorylation, adenosine diphosphate-ribosylation, glycosylation, sumoylation, or ubiquitylation and 2) enzymes that remodel DNA-histone structure with energy from ATP hydrolysis. Chromatin-regulating proteins, which modulate DNA-histone interaction, change chromatin conformation, and increase or decrease the binding of functional DNA-regulating protein complexes, have major functions in nuclear processes, including gene transcription and DNA replication, repair, and recombination. This review provides a general overview of chromatin-regulating proteins, including their classification, molecular functions, and interactions with the nucleosome in eukaryotic cells.
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Affiliation(s)
- Pingyu Zhang
- Department of Gastroenterology, Hepatology and Nutrition, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.
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111
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Kitagawa Y, Ohkura N, Kidani Y, Vandenbon A, Hirota K, Kawakami R, Yasuda K, Motooka D, Nakamura S, Kondo M, Taniuchi I, Kohwi-Shigematsu T, Sakaguchi S. Guidance of regulatory T cell development by Satb1-dependent super-enhancer establishment. Nat Immunol 2017; 18:173-183. [PMID: 27992401 PMCID: PMC5582804 DOI: 10.1038/ni.3646] [Citation(s) in RCA: 259] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/29/2016] [Indexed: 12/12/2022]
Abstract
Most Foxp3+ regulatory T (Treg) cells develop in the thymus as a functionally mature T cell subpopulation specialized for immune suppression. Their cell fate appears to be determined before Foxp3 expression; yet molecular events that prime Foxp3- Treg precursor cells are largely obscure. We found that Treg cell-specific super-enhancers (Treg-SEs), which were associated with Foxp3 and other Treg cell signature genes, began to be activated in Treg precursor cells. T cell-specific deficiency of the genome organizer Satb1 impaired Treg-SE activation and the subsequent expression of Treg signature genes, causing severe autoimmunity due to Treg cell deficiency. These results suggest that Satb1-dependent Treg-SE activation is crucial for Treg cell lineage specification in the thymus and that its perturbation is causative of autoimmune and other immunological diseases.
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Affiliation(s)
- Yohko Kitagawa
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
- Laboratory of Experimental Immunology, Department of Regeneration Science and Engineering, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Naganari Ohkura
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Yujiro Kidani
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Alexis Vandenbon
- Immuno-Genomics Research Unit, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Keiji Hirota
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
- Laboratory of Integrative Biological Science, Department of Regeneration Science and Engineering, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Ryoji Kawakami
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Keiko Yasuda
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
- Laboratory of Experimental Immunology, Department of Regeneration Science and Engineering, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Daisuke Motooka
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Suita, Japan
| | - Shota Nakamura
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Suita, Japan
| | - Motonari Kondo
- Department of Molecular Immunology, School of Medicine, Toho University, Tokyo, Japan
| | - Ichiro Taniuchi
- Laboratory for Transcriptional Regulation, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | | | - Shimon Sakaguchi
- Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
- Laboratory of Experimental Immunology, Department of Regeneration Science and Engineering, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
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112
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Hwang SS, Jang SW, Lee GR. RHS6-mediated chromosomal looping and nuclear substructure binding is required for Th2 cytokine gene expression. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2017; 1860:383-391. [PMID: 28132936 DOI: 10.1016/j.bbagrm.2017.01.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 01/09/2017] [Accepted: 01/16/2017] [Indexed: 12/24/2022]
Abstract
Subset-specific gene expression is a critical feature of CD4 T cell differentiation. Th2 cells express Th2 cytokine genes including Il4, Il5, and Il13 and mediate the immune response against helminths. The expression of Th2 cytokine genes is regulated by Rad50 hypersensitive site 6 (RHS6) in the Th2 locus control region; however, the molecular mechanisms of RHS6 action at the chromatin level are poorly understood. Here, we demonstrate that RHS6 is crucial for chromosomal interactions and nuclear substructure binding of the Th2 cytokine locus. RHS6-deficient cells had a marked reduction in chromatin remodeling and in intrachromosomal interactions at the Th2 locus. Deficiency of RHS6-binding transcription factors GATA3, SATB1, and IRF4 also caused a great reduction in chromatin remodeling and long-range chromosomal interactions involving the Th2 locus. RHS6 deficiency abrogated association of the Th2 locus with the nuclear substructure and RNA polymerase II. Therefore, RHS6 serves as a crucial cis-acting hub for coordinate regulation of Th2 cytokine genes by forming chromosomal loops and binding to a nuclear substructure.
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Affiliation(s)
- Soo Seok Hwang
- Department of Life Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Sung Woong Jang
- Department of Life Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Gap Ryol Lee
- Department of Life Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea.
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113
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Lee JJ, Kim M, Kim HP. Epigenetic regulation of long noncoding RNA UCA1 by SATB1 in breast cancer. BMB Rep 2017; 49:578-583. [PMID: 27697109 PMCID: PMC5227301 DOI: 10.5483/bmbrep.2016.49.10.156] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Indexed: 01/31/2023] Open
Abstract
Special AT-rich sequence binding protein 1 (SATB1) is a nuclear matrix-associated DNA-binding protein that functions as a chromatin organizer. SATB1 is highly expressed in aggressive breast cancer cells and promotes growth and metastasis by reprograming gene expression. Through genomewide cross-examination of gene expression and histone methylation, we identified SATB1 target genes for which expression is associated with altered epigenetic marks. Among the identified genes, long noncoding RNA urothelial carcinoma-associated 1 (UCA1) was upregulated by SATB1 depletion. Upregulation of UCA1 coincided with increased H3K4 trimethylation (H3K4me3) levels and decreased H3K27 trimethylation (H3K27me3) levels. Our study showed that SATB1 binds to the upstream region of UCA1 in vivo, and that its promoter activity increases with SATB1 depletion. Furthermore, simultaneous depletion of SATB1 and UCA1 potentiated suppression of tumor growth and cell survival. Thus, SATB1 repressed the expression of oncogenic UCA1, suppressing growth and survival of breast cancer cells. [BMB Reports 2016; 49(10): 578-583].
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Affiliation(s)
- Jong-Joo Lee
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Yonsei University College of Medicine; Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Mikyoung Kim
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Hyoung-Pyo Kim
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Yonsei University College of Medicine; Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Korea
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114
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Analysis of cellular and molecular antitumor effects upon inhibition of SATB1 in glioblastoma cells. BMC Cancer 2017; 17:3. [PMID: 28049521 PMCID: PMC5209874 DOI: 10.1186/s12885-016-3006-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 12/15/2016] [Indexed: 01/28/2023] Open
Abstract
Background The Special AT-rich Sequence Binding Protein 1 (SATB1) regulates the expression of many genes by acting as a global chromatin organizer. While in many tumor entities SATB1 overexpression has been observed and connected to pro-tumorigenic processes, somewhat contradictory evidence exists in brain tumors with regard to SATB1 overexpression in glioblastoma and its association with poorer prognosis and tumor progression. On the functional side, initial data indicate that SATB1 may be involved in several tumor cell-relevant processes. Methods For the detailed analysis of the functional relevance and possible therapeutic potential of SATB1 inhibition, we employ transient siRNA-mediated knockdown and comprehensively analyze the cellular and molecular role of SATB1 in glioblastoma. Results In various cell lines with different SATB1 expression levels, a SATB1 gene dose-dependent inhibition of anchorage-dependent and –independent proliferation is observed. This is due to cell cycle-inhibitory and pro-apoptotic effects of SATB1 knockdown. Molecular analyses reveal SATB1 knockdown effects on multiple important (proto-) oncogenes, including Myc, Bcl-2, Pim-1, EGFR, β-catenin and Survivin. Molecules involved in cell cycle, EMT and cell adhesion are affected as well. The putative therapeutic relevance of SATB1 inhibition is further supported in an in vivo tumor xenograft mouse model, where the treatment with polymeric nanoparticles containing SATB1-specific siRNAs exerts antitumor effects. Conclusion Our results demonstrate that SATB1 may represent a promising target molecule in glioblastoma therapy whose inhibition or knockdown affects multiple crucial pathways. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-3006-6) contains supplementary material, which is available to authorized users.
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Hepatic SATB1 induces paracrine activation of hepatic stellate cells and is upregulated by HBx. Sci Rep 2016; 6:37717. [PMID: 27883059 PMCID: PMC5121621 DOI: 10.1038/srep37717] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 10/28/2016] [Indexed: 12/23/2022] Open
Abstract
Chronic hepatitis B virus (HBV) infection is a major cause of chronic liver diseases, but its involvement in hepatic fibrogenesis remains unclear. Special AT-rich binding protein 1 (SATB1) has been implicated in reprogramming chromatin organization and transcription profiles in many cancers and non-cancer-related conditions. We found that hepatic SATB1 expression was significantly up-regulated in fibrotic tissues from chronic hepatitis B virus (HBV)-infected patients and HBV transgenic (HBV-Tg) mouse model. Knockdown of SATB1 in the liver significantly alleviated CCl4-induced fibrosis in HBV-Tg mouse model. Moreover, we suggested HBV encoded x protein (HBx) induced SATB1 expression through activation of JNK and ERK pathways. Enforced expression of SATB1 in hepatocytes promoted the activation and proliferation of hepatic stellate cells (HSCs) by secretion of connective tissue growth factor (CTGF), Interleukin-6 (IL-6) and platelet derived growth factor-A (PDGF-AA). Our findings demonstrated that HBx upregulated hepatic SATB1 which exerted pro-fibrotic effects by paracrine activation of stellate cells in HBV-related fibrosis.
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Mansour MA, Hyodo T, Akter KA, Kokuryo T, Uehara K, Nagino M, Senga T. SATB1 and SATB2 play opposing roles in c-Myc expression and progression of colorectal cancer. Oncotarget 2016; 7:4993-5006. [PMID: 26701851 PMCID: PMC4826260 DOI: 10.18632/oncotarget.6651] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 12/05/2015] [Indexed: 12/22/2022] Open
Abstract
Special AT-rich sequence-binding protein 1 and 2 (SATB1/2) are nuclear matrix-associated proteins involved in chromatin remodeling and regulation of gene expression. SATB2 acts as a tumor suppressor in laryngeal squamous cell carcinoma and colon cancer, whereas SATB1 promotes the progression of numerous types of cancers. In this study, we examined the effects of SATB1 and SATB2 on the malignant characteristics of colorectal cancer cells. SATB1 and SATB2 expression were negatively correlated in colorectal cancer specimens. SATB1 expression was increased, whereas SATB2 expression was reduced, in colorectal cancer tissues compared to control tissues. Exogenous expression of SATB2 in colorectal cancer cells suppressed cell proliferation, colony formation and tumor proliferation in mice. c-Myc was reduced by SATB2 expression, and exogenous expression of c-Myc in SATB2-expressing cells restored proliferation, colony formation and in vivo tumor growth of colorectal cancer cells. We also showed that c-Myc reduction by SATB2 was mediated by the inactivation of ERK5. In contrast, SATB1 promoted c-Myc expression. The expression of SATB1 in colorectal cancer tissues was positively correlated with c-Myc expression, and SATB1 knockdown reduced c-Myc expression in colorectal cancer cells. Finally, we showed that SATB1 knockdown in colorectal cancer cells suppressed cell proliferation, colony formation and cell invasion. Our results reveal interesting features of how the structural homologs SATB1 and SATB2 exert opposing functions in colorectal tumorigenesis.
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Affiliation(s)
- Mohammed A Mansour
- Division of Cancer Biology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan.,Biochemistry Section, Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Toshinori Hyodo
- Division of Cancer Biology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
| | - Khondker Ayesha Akter
- Division of Cancer Biology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
| | - Toshio Kokuryo
- Department of Surgical Oncology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
| | - Keisuke Uehara
- Department of Surgical Oncology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
| | - Masato Nagino
- Department of Surgical Oncology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
| | - Takeshi Senga
- Division of Cancer Biology, Nagoya University Graduate School of Medicine, Showa, Nagoya, 466-8550 Japan
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Wasilewski M, Chojnacka K, Chacinska A. Protein trafficking at the crossroads to mitochondria. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1864:125-137. [PMID: 27810356 DOI: 10.1016/j.bbamcr.2016.10.019] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/25/2016] [Accepted: 10/27/2016] [Indexed: 12/14/2022]
Abstract
Mitochondria are central power stations in the cell, which additionally serve as metabolic hubs for a plethora of anabolic and catabolic processes. The sustained function of mitochondria requires the precisely controlled biogenesis and expression coordination of proteins that originate from the nuclear and mitochondrial genomes. Accuracy of targeting, transport and assembly of mitochondrial proteins is also needed to avoid deleterious effects on protein homeostasis in the cell. Checkpoints of mitochondrial protein transport can serve as signals that provide information about the functional status of the organelles. In this review, we summarize recent advances in our understanding of mitochondrial protein transport and discuss examples that involve communication with the nucleus and cytosol.
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Affiliation(s)
- Michal Wasilewski
- International Institute of Molecular and Cell Biology in Warsaw, Poland.
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Meng WJ, Pathak S, Ding ZY, Zhang H, Adell G, Holmlund B, Li Y, Zhou ZG, Sun XF. Special AT-rich sequence binding protein 1 expression correlates with response to preoperative radiotherapy and clinical outcome in rectal cancer. Cancer Biol Ther 2016; 16:1738-45. [PMID: 26528635 DOI: 10.1080/15384047.2015.1095408] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Our recent study showed the important role of special AT-rich sequence binding protein 1 (SATB1) in the progression of human rectal cancer. However, the value of SATB1 in response to radiotherapy (RT) for rectal cancer hasn't been reported so far. Here, SATB1 was determined using immunohistochemistry in normal mucosa, biopsy, primary cancer, and lymph node metastasis from 132 rectal cancer patients: 66 with and 66 without preoperative RT before surgery. The effect of SATB1 knockdown on radiosensitivity was assessed by proliferation-based assay and clonogenic assay. The results showed that SATB1 increased from normal mucosa to primary cancer, whereas it decreased from primary cancer to metastasis in non-RT patients. SATB1 decreased in primary cancers after RT. In RT patients, positive SATB1 was independently associated with decreased response to preoperative RT, early time to metastasis, and worse survival. SATB1 negatively correlated with ataxia telangiectasia mutated (ATM) and pRb2/p130, and positively with Ki-67 and Survivin in RT patients, and their potential interaction through different canonical pathways was identified in network ideogram. Taken together, our findings disclose for the first time that radiation decreases SATB1 expression and sensitizes cancer cells to confer clinical benefit of patients, suggesting that SATB1 is predictive of response to preoperative RT and clinical outcome in rectal cancer.
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Affiliation(s)
- Wen-Jian Meng
- a Department of Gastrointestinal Surgery ; West China Hospital; Sichuan University ; Chengdu , China.,b Department of Oncology and Department of Clinical and Experimental Medicine ; Linköping University ; Linköping , Sweden
| | - Surajit Pathak
- b Department of Oncology and Department of Clinical and Experimental Medicine ; Linköping University ; Linköping , Sweden
| | - Zhen-Yu Ding
- c Cancer Center and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University ; Chengdu , China
| | - Hong Zhang
- d School of Medicine; Örebro University ; Örebro , Sweden
| | - Gunnar Adell
- e Department of Oncology ; County Council of Östergötland ; Linköping , Sweden
| | - Birgitta Holmlund
- e Department of Oncology ; County Council of Östergötland ; Linköping , Sweden
| | - Yuan Li
- f Institute of Digestive Surgery; State Key Laboratory of Biotherapy and Cancer Center; West China Hospital; Sichuan University ; Chengdu , China
| | - Zong-Guang Zhou
- a Department of Gastrointestinal Surgery ; West China Hospital; Sichuan University ; Chengdu , China.,f Institute of Digestive Surgery; State Key Laboratory of Biotherapy and Cancer Center; West China Hospital; Sichuan University ; Chengdu , China
| | - Xiao-Feng Sun
- b Department of Oncology and Department of Clinical and Experimental Medicine ; Linköping University ; Linköping , Sweden.,f Institute of Digestive Surgery; State Key Laboratory of Biotherapy and Cancer Center; West China Hospital; Sichuan University ; Chengdu , China
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Wu D, Zeng L, Liu F, Zhong Q, Zhang D, Cai C, Zhang W, Wu L, Chen H. Special AT-rich DNA-binding protein-1 expression is associated with liver cancer metastasis. Oncol Lett 2016; 12:4377-4384. [PMID: 28101200 PMCID: PMC5228311 DOI: 10.3892/ol.2016.5281] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 08/25/2016] [Indexed: 01/22/2023] Open
Abstract
To aim of the present study was to investigate the association between special AT-rich DNA-binding protein-1 (SATB1) expression and liver cancer metastasis. SATB1 mRNA and protein expression in hepatocellular carcinoma tissues was analyzed by immunohistochemistry, and in two hepatocellular cancer cell lines, MHCC-97H (high metastatic potential) and HepG2 (low metastatic potential), by reverse transcription-polymerase chain reaction and western blot analysis. Transwell migration and wound-healing assays were also performed to investigate the metastasis of liver cancer following upregulation or silencing of SATB1 expression. The results revealed that SATB1 expression was significantly higher in hepatocellular carcinoma tissues compared with carcinoma-adjacent tissues. Furthermore, SATB1 expression was correlated with tumor size, differentiation degree, hemorrhage and/or necrosis, invasion and/or metastases and TNM stage. Both the mRNA and protein expression of SATB1 was higher in MHCC-97H cells than HepG2 cells. In addition, the migration capability of MHCC-97H cells was decreased after SATB1 silencing, whereas the migration capability of HepG2 cells was increased after SATB1 upregulation. SATB1 expression was demonstrated to be positively correlated with liver cancer metastasis. These results indicate that liver cancer metastasis is regulated by SATB1 expression. Thus, immunohistochemical SATB1 expression may present an independent risk factor for the metastasis of liver cancer.
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Affiliation(s)
- Dongmei Wu
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Liangtao Zeng
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Fanrong Liu
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Qingling Zhong
- Department of Nursing, Medical College of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Deyuan Zhang
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Chang Cai
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Wen Zhang
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Liqing Wu
- Department of Pathology, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - He Chen
- Molecular Biology Center, Second Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
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Kaur S, Coulombe Y, Ramdzan ZM, Leduy L, Masson JY, Nepveu A. Special AT-rich Sequence-binding Protein 1 (SATB1) Functions as an Accessory Factor in Base Excision Repair. J Biol Chem 2016; 291:22769-22780. [PMID: 27590341 DOI: 10.1074/jbc.m116.735696] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 09/01/2016] [Indexed: 01/19/2023] Open
Abstract
Base excision repair is initiated by DNA glycosylases that recognize specific altered bases. DNA glycosylases for oxidized bases carry both a glycosylase activity that removes the faulty base and an apyrimidinic/apurinic lyase activity that introduces a single-strand DNA incision. In particular, the CUT domains within the CUX1 and CUX2 proteins were recently shown to interact with the 8-oxoguanine (8-oxoG) DNA glycosylase and stimulate its enzymatic activities. SATB1, which contains two CUT domains, was originally characterized as a T cell-specific genome organizer whose aberrant overexpression in breast cancer can promote tumor progression. Here we investigated the involvement of SATB1 in DNA repair. SATB1 knockdown caused a delay in DNA repair following exposure to H2O2, an increase in OGG1-sensitive oxidized bases within genomic DNA, and a decrease in 8-oxoG cleavage activity in cell extracts. In parallel, we observed an increase in phospho-CHK1 and γ-H2AX levels and a decrease in DNA synthesis. Conversely, ectopic expression of SATB1 accelerated DNA repair and reduced the levels of oxidized bases in genomic DNA. Moreover, an enhanced GFP-SATB1 fusion protein was rapidly recruited to laser microirradiation-induced DNA damage. Using purified proteins, we showed that SATB1 interacts directly with OGG1, increases its binding to 8-oxoG-containing DNA, promotes Schiff base formation, and stimulates its glycosylase and apyrimidinic/apurinic lyase enzymatic activities. Structure/function analysis demonstrated that CUT domains, but not the homeodomain, are responsible for the stimulation of OGG1. Together, these results identify another CUT domain protein that functions both as a transcription factor and an accessory factor in base excision repair.
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Affiliation(s)
- Simran Kaur
- From the Goodman Cancer Research Centre and.,Departments of Biochemistry
| | - Yan Coulombe
- the Genome Stability Laboratory, CHU de Québec Research Center, Québec City, Québec G1R 2J6, Canada, and.,the Department of Molecular Biology, Medical Biochemistry, and Pathology, Laval University Cancer Research Center, Québec City, Québec G1V 0A6, Canada
| | | | - Lam Leduy
- From the Goodman Cancer Research Centre and
| | - Jean-Yves Masson
- the Genome Stability Laboratory, CHU de Québec Research Center, Québec City, Québec G1R 2J6, Canada, and.,the Department of Molecular Biology, Medical Biochemistry, and Pathology, Laval University Cancer Research Center, Québec City, Québec G1V 0A6, Canada
| | - Alain Nepveu
- From the Goodman Cancer Research Centre and .,Departments of Biochemistry.,Oncology, and.,Medicine, McGill University, Montreal, Quebec H3A 1A3, Canada
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Sahni H, Ross S, Barbarulo A, Solanki A, Lau CI, Furmanski A, Saldaña JI, Ono M, Hubank M, Barenco M, Crompton T. A genome wide transcriptional model of the complex response to pre-TCR signalling during thymocyte differentiation. Oncotarget 2016; 6:28646-60. [PMID: 26415229 PMCID: PMC4745683 DOI: 10.18632/oncotarget.5796] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 09/08/2015] [Indexed: 01/19/2023] Open
Abstract
Developing thymocytes require pre-TCR signalling to differentiate from CD4-CD8- double negative to CD4+CD8+ double positive cell. Here we followed the transcriptional response to pre-TCR signalling in a synchronised population of differentiating double negative thymocytes. This time series analysis revealed a complex transcriptional response, in which thousands of genes were up and down-regulated before changes in cell surface phenotype were detected. Genome-wide measurement of RNA degradation of individual genes showed great heterogeneity in the rate of degradation between different genes. We therefore used time course expression and degradation data and a genome wide transcriptional modelling (GWTM) strategy to model the transcriptional response of genes up-regulated on pre-TCR signal transduction. This analysis revealed five major temporally distinct transcriptional activities that up regulate transcription through time, whereas down-regulation of expression occurred in three waves. Our model thus placed known regulators in a temporal perspective, and in addition identified novel candidate regulators of thymocyte differentiation.
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Affiliation(s)
- Hemant Sahni
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Susan Ross
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | | | - Anisha Solanki
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Ching-In Lau
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Anna Furmanski
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | | | - Masahiro Ono
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Mike Hubank
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Martino Barenco
- Institute of Child Health, University College London, London WC1N 1EH, UK
| | - Tessa Crompton
- Institute of Child Health, University College London, London WC1N 1EH, UK
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García-González E, Escamilla-Del-Arenal M, Arzate-Mejía R, Recillas-Targa F. Chromatin remodeling effects on enhancer activity. Cell Mol Life Sci 2016; 73:2897-910. [PMID: 27026300 PMCID: PMC11108574 DOI: 10.1007/s00018-016-2184-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 03/04/2016] [Accepted: 03/14/2016] [Indexed: 01/02/2023]
Abstract
During organism development, a diversity of cell types emerges with disparate, yet stable profiles of gene expression with distinctive cellular functions. In addition to gene promoters, the genome contains enhancer regulatory sequences, which are implicated in cellular specialization by facilitating cell-type and tissue-specific gene expression. Enhancers are DNA binding elements characterized by highly sophisticated and various mechanisms of action allowing for the specific interaction of general and tissue-specific transcription factors (TFs). However, eukaryotic organisms package their genetic material into chromatin, generating a physical barrier for TFs to interact with their cognate sequences. The ability of TFs to bind DNA regulatory elements is also modulated by changes in the chromatin structure, including histone modifications, histone variants, ATP-dependent chromatin remodeling, and the methylation status of DNA. Furthermore, it has recently been revealed that enhancer sequences are also transcribed into a set of enhancer RNAs with regulatory potential. These interdependent processes act in the context of a complex network of chromatin interactions, which together contributes to a renewed vision of how gene activation is coordinated in a cell-type-dependent manner. In this review, we describe the interplay between genetic and epigenetic aspects associated with enhancers and discuss their possible roles on enhancer function.
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Affiliation(s)
- Estela García-González
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, C.P. 04510, Mexico City, México
| | - Martín Escamilla-Del-Arenal
- Department of Biochemistry and Molecular Biophysics, Mortimer B. Zuckerman Mind Brain and Behavior Institute, Columbia University, New York City, NY, 10027, USA
| | - Rodrigo Arzate-Mejía
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, C.P. 04510, Mexico City, México
| | - Félix Recillas-Targa
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, C.P. 04510, Mexico City, México.
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The combination of sequence-specific and nonspecific DNA-binding modes of transcription factor SATB1. Biochem J 2016; 473:3321-39. [PMID: 27462121 DOI: 10.1042/bcj20160236] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 07/26/2016] [Indexed: 02/07/2023]
Abstract
Transcription factor SATB1 (special AT-rich sequence binding protein 1) contains multiple DNA-binding domains (DBDs), i.e. two CUT-domain repeats (CUTr1 and CUTr2 from the N-terminus) and a homeodomain, and binds to the matrix attachment region (MAR) of DNA. Although CUTr1 and the homeodomain, but not CUTr2, are known to contribute to DNA binding, different research groups have not reached a consensus on which DBD is responsible for recognition of the target sequence in MAR, 5'-TAATA-3'. Here, we used isothermal titration calorimetry to demonstrate that CUTr1 has binding specificity to this motif, whereas the homeodomain shows affinity for a variety of DNAs without specificity. In line with nonspecific DNA-binding properties of the homeodomain, a mutation of the invariant Asn at position 51 of the homeodomain (typically in contact with the A base in a sequence-specific binding mode) did not affect the binding affinity significantly. The NMR analyses and computational modeling of the homeodomain, however, revealed the tertiary structure and DNA-binding mode that are typical of homeodomains capable of sequence-specific binding. We believe that the lack of highly conserved basic residues in the helix relevant to the base recognition loosens its fitting into the DNA groove and impairs the specific binding. The two DBDs, when fused in tandem, showed strong binding to DNA containing the 5'-TAATA-3' motif with an affinity constant >10(8) M(-1) and retained nonspecific binding activity. The combination of the sequence-specific and nonspecific DNA-binding modes of SATB1 should be advantageous in a search for target loci during transcriptional regulation.
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124
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Abstract
Chromatin is a highly dynamic structure that imparts structural organization to the genome and regulates the gene expression underneath. The decade long research in deciphering the significance of epigenetics in maintaining cellular integrity has embarked the focus on chromatin remodeling enzymes. These drivers have been categorized as readers, writers and erasers with each having significance of their own. Largely, on the basis of structure, ATP dependent chromatin remodelers have been grouped into 4 families; SWI/SNF, ISWI, IN080 and CHD. It is still unclear to what degree these enzymes are swayed by local DNA sequences when shifting a nucleosome to different positions. The ability of regulating active and repressive transcriptional state via open and close chromatin architecture has been well studied however, the significance of chromatin remodelers in regulating transcription at each step i.e. initiation, elongation and termination require further attention. The authors have highlighted the significance and role of different chromatin remodelers in transcription, DNA repair and histone variant deposition.
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Affiliation(s)
- Monica Tyagi
- a Kusuma School of Biological Sciences, Indian Institute of Technology Delhi Hauz Khas , New Delhi , India
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125
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Abstract
The genes associated with Sjögren syndrome (SS) can be assigned to the NF-kB pathway, the IFN signaling pathway, lymphocyte signaling, and antigen presentation. The frequencies of risk variants show they are common with modest genetic effects. The strongest genetic association outside the human leukocyte antigen region is in IRF5, a gene relevant in the IFN signaling pathway and for B cell differentiation. Although no association has been found with the NF-kB gene itself, associations in TNFAIP3 and TNIP1 (both genome-wide significant), VCAM1 and IRAK1BP (both suggestive), point to genetic explanations for dysregulation of the NF-kB pathway in SS.
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Affiliation(s)
- Tove Ragna Reksten
- Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK 73104, USA; Broegelmann Research Laboratory, Department of Clinical Science, University of Bergen, The Laboratory Building, Haukeland University Hospital, Jonas Lies vei 87, N-5021 Bergen, Norway
| | - Christopher J Lessard
- Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK 73104, USA; Department of Pathology, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Boulevard, MBSB 451, Oklahoma City, OK 73104, USA
| | - Kathy L Sivils
- Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK 73104, USA; Department of Pathology, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Boulevard, MBSB 451, Oklahoma City, OK 73104, USA.
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126
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Wang Y, Zhang G, Kang L, Guan H. Expression Profiling of DNA Methylation and Transcriptional Repression Associated Genes in Lens Epithelium Cells of Age-Related Cataract. Cell Mol Neurobiol 2016; 37:537-543. [DOI: 10.1007/s10571-016-0393-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 06/09/2016] [Indexed: 10/21/2022]
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127
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Wang Y, Li F, Zhang G, Kang L, Guan H. Ultraviolet-B induces ERCC6 repression in lens epithelium cells of age-related nuclear cataract through coordinated DNA hypermethylation and histone deacetylation. Clin Epigenetics 2016; 8:62. [PMID: 27231489 PMCID: PMC4880862 DOI: 10.1186/s13148-016-0229-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 05/18/2016] [Indexed: 01/22/2023] Open
Abstract
Background Ultraviolet-B (UVB) exposure attributes to the formation of age-related nuclear cataract (ARNC), which is mediated with DNA damage. DNA damage, an important factor for pathogenesis of ARNC, is induced by UVB, and is generally resolved by the nucleotide excision repair (NER) repair mechanism. Cockayne syndrome complementation group B (CSB) protein coded by ERCC6 is a vital component for NER. However, we found no association between selected ERCC6 polymorphisms and ARNC. In this study, we investigated whether UVB exposure could alter ERCC6 expression and the process could involve epigenetic changes of DNA methylation and/or histone acetylation of ERCC6 in the lens epithelial cells (LECs). We also assessed the involvement of those coordinated changes in lens tissue from ARNC patients. Results mRNA and protein expression of ERCC6 in lens tissue (LECs) were lower in ARNCs than those in the controls. This reduction corresponded to methylation of a CpG site at the ERCC6 promoter and histone modifications (methylation and acetylation) nearby this site. UVB-treated human lens epithelium B3 (HLE-B3) and 239T cell presented (1) increased apoptosis, suggesting reduced UV-damage repair, (2) hypermethylation of the CpG site located at position -441 (relative to transcription start site) within the binding region for transcriptional factor Sp1 in the ERCC6 promoter, (3) the enhancement of histone H3K9 deacetylation, (4) induction in DNA methyltransferases 3b (DNMT3b) and histone deacetylase1 (HDAC1) associated to the CpG site of ERCC6 by CHIP assay. Conclusions These findings suggest an orchestrated mechanism triggered by UVB radiation where the concurrent association of specific hypermethylation CpG site, H3K9 deacetylation of ERCC6, and repression of ERCC6 gene expression. Taken together, with the similar changes in the lens tissue from ARNC patients, our data unveiled a possible mechanism of epigenetic modification of DNA repair gene in the pathogenesis of ARNC. Electronic supplementary material The online version of this article (doi:10.1186/s13148-016-0229-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yong Wang
- Eye Institute, Affiliated Hospital of Nantong University, 20 Xisi Road, Nantong, Jiangsu China
| | - Fei Li
- Ophthalmology Department, Chengdu Fifth People's Hospital, Chengdu, Sichuan China
| | - Guowei Zhang
- Eye Institute, Affiliated Hospital of Nantong University, 20 Xisi Road, Nantong, Jiangsu China
| | - Lihua Kang
- Eye Institute, Affiliated Hospital of Nantong University, 20 Xisi Road, Nantong, Jiangsu China
| | - Huaijin Guan
- Eye Institute, Affiliated Hospital of Nantong University, 20 Xisi Road, Nantong, Jiangsu China
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128
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Impact of Different Promoters on Episomal Vectors Harbouring Characteristic Motifs of Matrix Attachment Regions. Sci Rep 2016; 6:26446. [PMID: 27226236 PMCID: PMC4881036 DOI: 10.1038/srep26446] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 04/29/2016] [Indexed: 12/19/2022] Open
Abstract
We previously demonstrated that the characteristic sequence of matrix attachment regions (MARs) allows transgenes to be maintained episomally in CHO cells. In the present study, six commonly used promoters from human cytomegalovirus major immediate-early (CMV), simian vacuolating virus 40 (SV40), Rous sarcoma virus, Homo sapiens ubiquitin C, phosphoglycerate kinase, and β-globin, respectively, were evaluated to determine their effects on transgene expression and stability in CHO cells stably transfected via the episomal vector harbouring characteristic MAR motifs. The CHO cells were transfected with vectors and then screened using G418, after which the stably transfected cells were split into two and further cultured either in the presence or absence of G418. Of the six promoters, the CMV promoter yielded the highest transgene expression levels and the highest transfection efficiency, whereas the SV40 promoter maintained transgene expression more stably during long-term culture than the other promoters did. The CMV and SV40 promoter-containing vectors were furthermore episomally maintained and conferred sustained eGFP expression in the cells even under nonselective conditions. On the basis of these findings, we conclude that the CMV promoter performs best in terms of yielding both high expression levels and high levels of stability using this episomal vector system.
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129
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Fryland T, Christensen JH, Pallesen J, Mattheisen M, Palmfeldt J, Bak M, Grove J, Demontis D, Blechingberg J, Ooi HS, Nyegaard M, Hauberg ME, Tommerup N, Gregersen N, Mors O, Corydon TJ, Nielsen AL, Børglum AD. Identification of the BRD1 interaction network and its impact on mental disorder risk. Genome Med 2016; 8:53. [PMID: 27142060 PMCID: PMC4855718 DOI: 10.1186/s13073-016-0308-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 04/15/2016] [Indexed: 01/23/2023] Open
Abstract
Background The bromodomain containing 1 (BRD1) gene has been implicated with transcriptional regulation, brain development, and susceptibility to schizophrenia and bipolar disorder. To advance the understanding of BRD1 and its role in mental disorders, we characterized the protein and chromatin interactions of the BRD1 isoforms, BRD1-S and BRD1-L. Methods Stable human cell lines expressing epitope tagged BRD1-S and BRD1-L were generated and used as discovery systems for identifying protein and chromatin interactions. Protein-protein interactions were identified using co-immunoprecipitation followed by mass spectrometry and chromatin interactions were identified using chromatin immunoprecipitation followed by next generation sequencing. Gene expression profiles and differentially expressed genes were identified after upregulating and downregulating BRD1 expression using microarrays. The presented functional molecular data were integrated with human genomic and transcriptomic data using available GWAS, exome-sequencing datasets as well as spatiotemporal transcriptomic datasets from the human brain. Results We present several novel protein interactions of BRD1, including isoform-specific interactions as well as proteins previously implicated with mental disorders. By BRD1-S and BRD1-L chromatin immunoprecipitation followed by next generation sequencing we identified binding to promoter regions of 1540 and 823 genes, respectively, and showed correlation between BRD1-S and BRD1-L binding and regulation of gene expression. The identified BRD1 interaction network was found to be predominantly co-expressed with BRD1 mRNA in the human brain and enriched for pathways involved in gene expression and brain function. By interrogation of large datasets from genome-wide association studies, we further demonstrate that the BRD1 interaction network is enriched for schizophrenia risk. Conclusion Our results show that BRD1 interacts with chromatin remodeling proteins, e.g. PBRM1, as well as histone modifiers, e.g. MYST2 and SUV420H1. We find that BRD1 primarily binds in close proximity to transcription start sites and regulates expression of numerous genes, many of which are involved with brain development and susceptibility to mental disorders. Our findings indicate that BRD1 acts as a regulatory hub in a comprehensive schizophrenia risk network which plays a role in many brain regions throughout life, implicating e.g. striatum, hippocampus, and amygdala at mid-fetal stages. Electronic supplementary material The online version of this article (doi:10.1186/s13073-016-0308-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tue Fryland
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Jane H Christensen
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Jonatan Pallesen
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Manuel Mattheisen
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Johan Palmfeldt
- Research Unit for Molecular Medicine, Aarhus University Hospital, 8200, Skejby, Denmark
| | - Mads Bak
- Wilhelm Johannsen Centre for Functional Genome Research, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - Jakob Grove
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark.,Bioinformatics Research Centre (BiRC, Aarhus University, 8000, Aarhus C, Denmark
| | - Ditte Demontis
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Jenny Blechingberg
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark
| | - Hong Sain Ooi
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Mette Nyegaard
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Mads E Hauberg
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Niels Tommerup
- Wilhelm Johannsen Centre for Functional Genome Research, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - Niels Gregersen
- Research Unit for Molecular Medicine, Aarhus University Hospital, 8200, Skejby, Denmark
| | - Ole Mors
- iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark.,Research Department P, Aarhus University Hospital, 8240, Risskov, Denmark
| | - Thomas J Corydon
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Anders L Nielsen
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark.,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark.,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark
| | - Anders D Børglum
- Department of Biomedicine, Aarhus University, Building 1242, Bartholins Allé 6, 8000, Aarhus C, Denmark. .,iPSYCH, The Lundbeck Foundation Initiative for Integrative Psychiatric Research, 8000 Aarhus C, Denmark. .,iSEQ, Centre for Integrative Sequencing, Aarhus University, 8000, Aarhus C, Denmark. .,Research Department P, Aarhus University Hospital, 8240, Risskov, Denmark.
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130
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Tian Y, Garcia G, Bian Q, Steffen KK, Joe L, Wolff S, Meyer BJ, Dillin A. Mitochondrial Stress Induces Chromatin Reorganization to Promote Longevity and UPR(mt). Cell 2016; 165:1197-1208. [PMID: 27133166 DOI: 10.1016/j.cell.2016.04.011] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 10/23/2015] [Accepted: 04/01/2016] [Indexed: 01/01/2023]
Abstract
Organisms respond to mitochondrial stress through the upregulation of an array of protective genes, often perpetuating an early response to metabolic dysfunction across a lifetime. We find that mitochondrial stress causes widespread changes in chromatin structure through histone H3K9 di-methylation marks traditionally associated with gene silencing. Mitochondrial stress response activation requires the di-methylation of histone H3K9 through the activity of the histone methyltransferase met-2 and the nuclear co-factor lin-65. While globally the chromatin becomes silenced by these marks, remaining portions of the chromatin open up, at which point the binding of canonical stress responsive factors such as DVE-1 occurs. Thus, a metabolic stress response is established and propagated into adulthood of animals through specific epigenetic modifications that allow for selective gene expression and lifespan extension.
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Affiliation(s)
- Ye Tian
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Gilberto Garcia
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Qian Bian
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Kristan K Steffen
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Larry Joe
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Suzanne Wolff
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Barbara J Meyer
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Andrew Dillin
- Department of Molecular and Cell Biology, Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; The Glenn Center for Aging Research, University of California, Berkeley, Berkeley, CA 94720, USA.
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131
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Winick-Ng W, Caetano FA, Winick-Ng J, Morey TM, Heit B, Rylett RJ. 82-kDa choline acetyltransferase and SATB1 localize to β-amyloid induced matrix attachment regions. Sci Rep 2016; 6:23914. [PMID: 27052102 PMCID: PMC4823725 DOI: 10.1038/srep23914] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 03/16/2016] [Indexed: 01/29/2023] Open
Abstract
The M-transcript of human choline acetyltransferase (ChAT) produces an 82-kDa protein (82-kDa ChAT) that concentrates in nuclei of cholinergic neurons. We assessed the effects of acute exposure to oligomeric amyloid-β1–42 (Aβ1–42) on 82-kDa ChAT disposition in SH-SY5Y neural cells, finding that acute exposure to Aβ1–42 results in increased association of 82-kDa ChAT with chromatin and formation of 82-kDa ChAT aggregates in nuclei. When measured by chromatin immunoprecipitation with next-generation sequencing (ChIP-seq), we identified that Aβ1–42 -exposure increases 82-kDa ChAT association with gene promoters and introns. The Aβ1–42 -induced 82-kDa ChAT aggregates co-localize with special AT-rich binding protein 1 (SATB1), which anchors DNA to scaffolding/matrix attachment regions (S/MARs). SATB1 had a similar genomic association as 82-kDa ChAT, with both proteins associating with synapse and cell stress genes. After Aβ1–42 -exposure, both SATB1 and 82-kDa ChAT are enriched at the same S/MAR on the APP gene, with 82-kDa ChAT expression attenuating an increase in an isoform-specific APP mRNA transcript. Finally, 82-kDa ChAT and SATB1 have patterned genomic association at regions enriched with S/MAR binding motifs. These results demonstrate that 82-kDa ChAT and SATB1 play critical roles in the response of neural cells to acute Aβ -exposure.
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Affiliation(s)
- Warren Winick-Ng
- Department of Physiology and Pharmacology, Schulich School of Medicine &Dentistry, University of Western Ontario, London, Ontario, N6A 5C1 Canada.,Molecular Medicine Group, Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5C1 Canada
| | - Fabiana A Caetano
- Department of Physiology and Pharmacology, Schulich School of Medicine &Dentistry, University of Western Ontario, London, Ontario, N6A 5C1 Canada.,Molecular Medicine Group, Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5C1 Canada
| | | | - Trevor M Morey
- Department of Physiology and Pharmacology, Schulich School of Medicine &Dentistry, University of Western Ontario, London, Ontario, N6A 5C1 Canada.,Molecular Medicine Group, Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5C1 Canada
| | - Bryan Heit
- Department of Microbiology and Immunology, Schulich School of Medicine &Dentistry, University of Western Ontario, London, Ontario, N6A 5C1 Canada
| | - R Jane Rylett
- Department of Physiology and Pharmacology, Schulich School of Medicine &Dentistry, University of Western Ontario, London, Ontario, N6A 5C1 Canada.,Molecular Medicine Group, Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5C1 Canada
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132
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Seo W, Taniuchi I. Transcriptional regulation of early T-cell development in the thymus. Eur J Immunol 2016; 46:531-8. [DOI: 10.1002/eji.201545821] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 11/30/2015] [Accepted: 01/08/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Wooseok Seo
- Laboratory for Transcriptional Regulation; RIKEN Center for Integrative Medical Sciences; Yokohama Kanagawa Japan
| | - Ichiro Taniuchi
- Laboratory for Transcriptional Regulation; RIKEN Center for Integrative Medical Sciences; Yokohama Kanagawa Japan
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133
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Satb1 Overexpression Drives Tumor-Promoting Activities in Cancer-Associated Dendritic Cells. Cell Rep 2016; 14:1774-1786. [PMID: 26876172 DOI: 10.1016/j.celrep.2016.01.056] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 12/14/2015] [Accepted: 01/14/2016] [Indexed: 02/07/2023] Open
Abstract
Special AT-rich sequence-binding protein 1 (Satb1) governs genome-wide transcriptional programs. Using a conditional knockout mouse, we find that Satb1 is required for normal differentiation of conventional dendritic cells (DCs). Furthermore, Satb1 governs the differentiation of inflammatory DCs by regulating major histocompatibility complex class II (MHC II) expression through Notch1 signaling. Mechanistically, Satb1 binds to the Notch1 promoter, activating Notch expression and driving RBPJ occupancy of the H2-Ab1 promoter, which activates MHC II transcription. However, tumor-driven, unremitting expression of Satb1 in activated Zbtb46(+) inflammatory DCs that infiltrate ovarian tumors results in an immunosuppressive phenotype characterized by increased secretion of tumor-promoting Galectin-1 and IL-6. In vivo silencing of Satb1 in tumor-associated DCs reverses their tumorigenic activity and boosts protective immunity. Therefore, dynamic fluctuations in Satb1 expression govern the generation and immunostimulatory activity of steady-state and inflammatory DCs, but continuous Satb1 overexpression in differentiated DCs converts them into tolerogenic/pro-inflammatory cells that contribute to malignant progression.
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134
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Lv JH, Wang F, Shen MH, Wang X, Zhou XJ. SATB1 expression is correlated with β-catenin associated epithelial-mesenchymal transition in colorectal cancer. Cancer Biol Ther 2016; 17:254-61. [PMID: 26810818 DOI: 10.1080/15384047.2016.1139239] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
SATB1, a global gene regulator, has been implicated in the growth and metastasis of multiple cancers, including colorectal cancer. While the understanding about the role of SATB1 in CRC remains limited. The aim of our study is to investigate the expression of SATB1 in CRC, and the relationship between SATB1 expression pattern and clinicopathological variables. A further aim is to analyze the correlation between SATB1 expression and epithelial-mesenchymal transition in CRC. Immunohistochemical expression of SATB1, β-catenin, E-cadherin, CK20, Vimentin, SMA, and desmin were assessed in a cohort of 200 patients using tissue microarrays. SATB1 was expressed in 133 (66.5%) CRC primary lesions, 14 (28%) adjacent colorectal mucosa specimens, and 60 (75%) corresponding lymph node metastases. The expression level of SATB1 was significantly higher in lymph node metastases than in CRC primary lesions and normal mucosa (P = 0.000). High expression of SATB1 in CRC was strongly correlated with poor differentiation of tumor tissues (P = 0.000). High expression of SATB1 was significantly correlated with aberrant expression of β-catenin (P = 0.0005), low expression of E-cadherin (P = 0.000) and CK20 (P = 0.000) and with high expression of Vimentin (P = 0.001). No SMA or desmin protein was expressed in the CRC cells. Our results suggested that high expression of SATB1 is significantly correlated with poor differentiation of CRC. SATB1 might promote the epithelial-mesenchymal transition by increasing the aberrant expression of β-catenin.
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Affiliation(s)
- Jing-huan Lv
- a Department of Pathology , Jinling Hospital, Medical School of Nanjing University , Nanjing , China.,b Department of Pathology , the Suzhou Hospital Affiliated to Nanjing Medical University , Suzhou , China
| | - Feng Wang
- b Department of Pathology , the Suzhou Hospital Affiliated to Nanjing Medical University , Suzhou , China
| | - Ming-hong Shen
- b Department of Pathology , the Suzhou Hospital Affiliated to Nanjing Medical University , Suzhou , China
| | - Xuan Wang
- a Department of Pathology , Jinling Hospital, Medical School of Nanjing University , Nanjing , China
| | - Xiao-jun Zhou
- a Department of Pathology , Jinling Hospital, Medical School of Nanjing University , Nanjing , China
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135
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Regulation of IL-4 Expression in Immunity and Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 941:31-77. [PMID: 27734408 DOI: 10.1007/978-94-024-0921-5_3] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IL-4 was first identified as a T cell-derived growth factor for B cells. Studies over the past several decades have markedly expanded our understanding of its cellular sources and function. In addition to T cells, IL-4 is produced by innate lymphocytes, such as NTK cells, and myeloid cells, such as basophils and mast cells. It is a signature cytokine of type 2 immune response but also has a nonimmune function. Its expression is tightly regulated at several levels, including signaling pathways, transcription factors, epigenetic modifications, microRNA, and long noncoding RNA. This chapter will review in detail the molecular mechanism regulating the cell type-specific expression of IL-4 in physiological and pathological type 2 immune responses.
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136
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Luo XD, Yang SJ, Wang JN, Tan L, Liu D, Wang YY, Zheng RH, Wu XH, Xu LH, Tan H. Downregulation of SATB1 increases the invasiveness of Jurkat cell via activation of the WNT/β-catenin signaling pathway in vitro. Tumour Biol 2015; 37:7413-9. [PMID: 26678884 DOI: 10.1007/s13277-015-4638-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 12/10/2015] [Indexed: 12/20/2022] Open
Abstract
Special AT-rich sequence-binding protein-1 (SATB1) is critical for genome organizer that reprograms chromatin organization and transcription profiles, and associated with tumor growth and metastasis in several cancer types. Many studies suggest that SATB1 overexpression is an indicator of poor prognosis in various cancers, such as breast cancer, malignant cutaneous melanoma, and liver cancer. However, their expression patterns and function values for adult T cell leukemia (ATL) are still largely unknown. The aim of this study is to examine the levels of SATB1 in ATL and to explore its function and mechanisms in Jurkat cell line. Here, we reported that SATB1 expressions were decreased in ATL cells (p < 0.001) compared with normal controls. Knockdown of SATB1 expression significantly enhanced invasion of Jurkat cell in vitro. Furthermore, knockdown of SATB1 gene enhances β-catenin nuclear accumulation and transcriptional activity and thus may increase the invasiveness of Jurkat cell through the activation of Wnt/β-catenin signaling pathway in vitro.
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Affiliation(s)
- Xiao-Dan Luo
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Shao-Jiang Yang
- Department of Hematology, The First People's Hospital of Foshan, Foshan, 528000, China
| | - Jia-Ni Wang
- Breast Cancer Center, The third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Li Tan
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Dan Liu
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Ya-Ya Wang
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Run-Hui Zheng
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Xiao-Hong Wu
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China
| | - Li-Hua Xu
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China.
| | - Huo Tan
- Department of Hematology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510230, People's Republic of China.
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137
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Kondo M, Tanaka Y, Kuwabara T, Naito T, Kohwi-Shigematsu T, Watanabe A. SATB1 Plays a Critical Role in Establishment of Immune Tolerance. THE JOURNAL OF IMMUNOLOGY 2015; 196:563-72. [DOI: 10.4049/jimmunol.1501429] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 11/13/2015] [Indexed: 01/21/2023]
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138
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Zhao Z, Ma J, Wu K, Chen L, Yu J, Hu W, Zhang K. SATB1 is a potential therapeutic target in intrahepatic cholangiocarcinoma. Clin Transl Oncol 2015; 18:878-83. [PMID: 26563145 DOI: 10.1007/s12094-015-1449-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 11/03/2015] [Indexed: 10/22/2022]
Abstract
BACKGROUND Intrahepatic cholangiocarcinoma (ICC) is the second most common primary malignant tumor of the liver with a poor prognosis. Upregulation of special AT-rich sequence-binding protein 1 (SATB1) promotes tumor progression. However, little is known about the role of SATB1 in ICC tumorigenesis. METHODS We firstly investigated the expression of SATB1 in 88 cases of ICC by immunohistochemistry (IHC), QRT-PCR, and western blot. Meanwhile, we constructed stably knockdown (shRNA) of SATB1 in ICC cell lines to evaluate the effects of SATB1 on the ability of cell proliferation and invasion by MTT and transwell invasion assay. RESULTS Our result showed that SATB1 was overexpressed in ICC tissues samples. Knockdown of SATB1 could inhibit ICC cell proliferation, and suppress ICC cell invasion of ICC cell lines. In addition, the depletion of SATB1 expression suppressed the MYC levels in vitro. CONCLUSIONS Our results highlight the significance of SATB1 in ICC and suggest that SATB1 could be a promising therapy target and a potential biomarker for prognosis in ICC patients.
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Affiliation(s)
- Z Zhao
- Pancreato-Biliary Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - J Ma
- Thoracic Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - K Wu
- Colorectal Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - L Chen
- Pancreato-Biliary Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - J Yu
- Pancreato-Biliary Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - W Hu
- Pancreato-Biliary Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China
| | - K Zhang
- Pancreato-Biliary Surgery Department, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China.
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139
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The conservation and signatures of lincRNAs in Marek's disease of chicken. Sci Rep 2015; 5:15184. [PMID: 26471251 PMCID: PMC4608010 DOI: 10.1038/srep15184] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 09/15/2015] [Indexed: 01/10/2023] Open
Abstract
Long intergenic non-coding RNAs (lincRNAs) associated with a number of cancers and other diseases have been identified in mammals, but they are still formidable to be comprehensively identified and characterized. Marek's disease (MD) is a T cell lymphoma of chickens induced by Marek's disease virus (MDV). Here, we used a MD chicken model to develop a precise pipeline for identifying lincRNAs and to determine the roles of lincRNAs in T cell tumorigenesis. More than 1,000 lincRNA loci were identified in chicken bursa. Computational analyses demonstrated that lincRNAs are conserved among different species such as human, mouse and chicken. The putative lincRNAs were found to be associated with a wide range of biological functions including immune responses. Interestingly, we observed distinct lincRNA expression signatures in bursa between MD resistant and susceptible lines of chickens. One of the candidate lincRNAs, termed linc-satb1, was found to play a crucial role in MD immune response by regulating a nearby protein-coding gene SATB1. Thus, our results manifested that lincRNAs may exert considerable influence on MDV-induced T cell tumorigenesis and provide a rich resource for hypothesis-driven functional studies to reveal genetic mechanisms underlying susceptibility to tumorigenesis.
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140
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SATB1 Mediates Long-Range Chromatin Interactions: A Dual Regulator of Anti-Apoptotic BCL2 and Pro-Apoptotic NOXA Genes. PLoS One 2015; 10:e0139170. [PMID: 26422397 PMCID: PMC4589335 DOI: 10.1371/journal.pone.0139170] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 09/08/2015] [Indexed: 01/19/2023] Open
Abstract
Aberrant expression of special AT-rich binding protein 1 (SATB1), a global genomic organizer, has been associated with various cancers, which raises the question of how higher-order chromatin structure contributes to carcinogenesis. Disruption of apoptosis is one of the hallmarks of cancer. We previously demonstrated that SATB1 mediated specific long-range chromosomal interactions between the mbr enhancer located within 3’-UTR of the BCL2 gene and the promoter to regulate BCL2 expression during early apoptosis. In the present study, we used chromosome conformation capture (3C) assays and molecular analyses to further investigate the function of the SATB1-mediated higher-order chromatin structure in co-regulation of the anti-apoptotic BCL2 gene and the pro-apoptotic NOXA gene located 3.4Mb downstream on Chromosome 18. We demonstrated that the mbr enhancer spatially juxtaposed the promoters of BCL2 and NOXA genes through SATB1-mediated chromatin-loop in Jurkat cells. Decreased SATB1 levels switched the mbr-BCL2 loop to mbr-NOXA loop, and thus changed expression of these two genes. The SATB1-mediated dynamic switch of the chromatin loop structures was essential for the cooperative expression of the BCL2 and NOXA genes in apoptosis. Notably, the role of SATB1 was specific, since inhibition of SATB1 degradation by caspase-6 inhibitor or caspase-6-resistant SATB1 mutant reversed expression of BCL-2 and NOXA in response to apoptotic stimulation. This study reveals the critical role of SATB1-organized higher-order chromatin structure in regulating the dynamic equilibrium of apoptosis-controlling genes with antagonistic functions and suggests that aberrant SATB1 expression might contribute to cancer development by disrupting the co-regulated genes in apoptosis pathways.
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141
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Abstract
Regulation of chromatin structure is an essential component of the DNA damage response (DDR), which effectively preserves the integrity of DNA by a network of multiple DNA repair and associated signaling pathways. Within the DDR, chromatin is modified and remodeled to facilitate efficient DNA access, to control the activity of repair proteins and to mediate signaling. The mammalian ISWI family has recently emerged as one of the major ATP-dependent chromatin remodeling complex families that function in the DDR, as it is implicated in at least 3 major DNA repair pathways: homologous recombination, non-homologous end-joining and nucleotide excision repair. In this review, we discuss the various manners through which different ISWI complexes regulate DNA repair and how they are targeted to chromatin containing damaged DNA.
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Key Words
- ACF1
- ACF1, ATP-utilizing Chromatin assembly and remodeling Factor 1
- ATP-dependent chromatin remodeling
- BER, Base Excision Repair
- DDR, DNA Damage Response
- DNA damage response
- DSB, Double Strand Break
- GG-NER, Global Genome Nucleotide Excision Repair
- HR, Homologous Recombination
- Homologous Recombination
- ISWI
- ISWI, Imitation SWItch
- MRN, MRE11/Rad50/NBS1
- NER, Nucleotide Excision Repair
- NHEJ, Non-Homologous End Joining
- Non-Homologous End-Joining
- Nucleotide Excision Repair
- PAR, Poly(ADP-Ribose)
- RNApolII, RNA Polymerase II
- RSF1, Remodeling and Spacing Factor 1
- SMARCA, SWI-SNF-related Matrix-associated Actin-dependent Regulator of Chromatin A
- SMARCA5/SNF2H
- TC-NER, Transcription-Coupled Nucleotide Excision Repair
- WSTF
- WSTF, Williams Syndrome Transcription Factor
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Affiliation(s)
- Özge Z Aydin
- a Department of Genetics ; Cancer Genomics Netherlands; Erasmus MC ; Rotterdam , The Netherlands
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142
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Brichta L, Shin W, Jackson-Lewis V, Blesa J, Yap EL, Walker Z, Zhang J, Roussarie JP, Alvarez MJ, Califano A, Przedborski S, Greengard P. Identification of neurodegenerative factors using translatome-regulatory network analysis. Nat Neurosci 2015. [PMID: 26214373 PMCID: PMC4763340 DOI: 10.1038/nn.4070] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
For degenerative disorders of the CNS, the main obstacle to therapeutic advancement has been the challenge of identifying the key molecular mechanisms underlying neuronal loss. We developed a combinatorial approach including translational profiling and brain regulatory network analysis to search for key determinants of neuronal survival or death. Following the generation of transgenic mice for cell type-specific profiling of midbrain dopaminergic neurons, we established and compared translatome libraries reflecting the molecular signature of these cells at baseline or under degenerative stress. Analysis of these libraries by interrogating a context-specific brain regulatory network led to the identification of a repertoire of intrinsic upstream regulators that drive the dopaminergic stress response. The altered activity of these regulators was not associated with changes in their expression levels. This strategy can be generalized for the identification of molecular determinants involved in the degeneration of other classes of neurons.
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Affiliation(s)
- Lars Brichta
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - William Shin
- Department of Systems Biology, Columbia University, New York, New York, USA.,Department of Biological Sciences, Columbia University, New York, New York, USA
| | - Vernice Jackson-Lewis
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Javier Blesa
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Ee-Lynn Yap
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Zachary Walker
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Jack Zhang
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Jean-Pierre Roussarie
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Mariano J Alvarez
- Department of Systems Biology, Columbia University, New York, New York, USA
| | - Andrea Califano
- Department of Systems Biology, Columbia University, New York, New York, USA
| | - Serge Przedborski
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Paul Greengard
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
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143
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Wang S, Wang L, Zhang Y, Liu Y, Meng F, Ma J, Shang P, Gao Y, Huang Q, Chen X. Special AT-rich sequence-binding protein 1: a novel biomarker predicting cervical squamous cell carcinoma prognosis and lymph node metastasis. Jpn J Clin Oncol 2015; 45:812-8. [DOI: 10.1093/jjco/hyv093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 05/23/2015] [Indexed: 12/20/2022] Open
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144
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Bachas C, Schuurhuis GJ, Zwaan CM, van den Heuvel-Eibrink MM, den Boer ML, de Bont ESJM, Kwidama ZJ, Reinhardt D, Creutzig U, de Haas V, Kaspers GJL, Cloos J. Gene expression profiles associated with pediatric relapsed AML. PLoS One 2015; 10:e0121730. [PMID: 25849371 PMCID: PMC4388534 DOI: 10.1371/journal.pone.0121730] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 02/17/2015] [Indexed: 02/04/2023] Open
Abstract
Development of relapse remains a problem for further improvements in the survival of pediatric AML patients. While virtually all patients show a good response to initial treatment, more patients respond poorly when treated at relapse. The cellular characteristics of leukemic blast cells that allow survival of initial treatment, relapse development and subsequent resistance to salvage treatment remain largely elusive. Therefore, we studied if leukemic blasts at relapse biologically resemble their initial diagnosis counterparts. We performed microarray gene expression profiling on paired initial and relapse samples of 23 pediatric AML patients. In 11 out of 23 patients, gene expression profiles of initial and corresponding relapse samples end up in different clusters in unsupervised analysis, indicating altered gene expression profiles. In addition, shifts in type I/II mutational status were found in 5 of these 11 patients, while shifts were found in 3 of the remaining 12 patients. Although differentially expressed genes varied between patients, they were commonly related to hematopoietic differentiation, encompassed genes involved in chromatin remodeling and showed associations with similar transcription factors. The top five were CEBPA, GFI1, SATB1, KLF2 and TBP. In conclusion, the leukemic blasts at relapse are biologically different from their diagnosis counterparts. These differences may be exploited for further development of novel treatment strategies.
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Affiliation(s)
- Costa Bachas
- Department of Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
| | | | - C. Michel Zwaan
- Department of Pediatric Oncology/Hematology, Erasmus MC/Sophia Children’s Hospital, Rotterdam, The Netherlands
| | | | - Monique L. den Boer
- Department of Pediatric Oncology/Hematology, Erasmus MC/Sophia Children’s Hospital, Rotterdam, The Netherlands
| | - Eveline S. J. M. de Bont
- Division of Pediatric Oncology/Hematology, Department of Pediatrics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Zinia J. Kwidama
- Department of Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands
| | - Dirk Reinhardt
- AML-BFM Study Group, Department of Pediatric Hematology/ Oncology, Medical School Hannover, Hannover, Germany
| | - Ursula Creutzig
- AML-BFM Study Group, Department of Pediatric Hematology/ Oncology, Medical School Hannover, Hannover, Germany
| | - Valérie de Haas
- Dutch Childhood Oncology Group (DCOG), The Hague, The Netherlands
| | - Gertjan J. L. Kaspers
- Department of Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands
- Dutch Childhood Oncology Group (DCOG), The Hague, The Netherlands
| | - Jacqueline Cloos
- Department of Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
- * E-mail:
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145
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Hao B, Naik AK, Watanabe A, Tanaka H, Chen L, Richards HW, Kondo M, Taniuchi I, Kohwi Y, Kohwi-Shigematsu T, Krangel MS. An anti-silencer- and SATB1-dependent chromatin hub regulates Rag1 and Rag2 gene expression during thymocyte development. ACTA ACUST UNITED AC 2015; 212:809-24. [PMID: 25847946 PMCID: PMC4419350 DOI: 10.1084/jem.20142207] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 03/12/2015] [Indexed: 12/12/2022]
Abstract
Rag1 and Rag2 gene expression in CD4(+)CD8(+) double-positive (DP) thymocytes depends on the activity of a distant anti-silencer element (ASE) that counteracts the activity of an intergenic silencer. However, the mechanistic basis for ASE activity is unknown. Here, we show that the ASE physically interacts with the distant Rag1 and Rag2 gene promoters in DP thymocytes, bringing the two promoters together to form an active chromatin hub. Moreover, we show that the ASE functions as a classical enhancer that can potently activate these promoters in the absence of the silencer or other locus elements. In thymocytes lacking the chromatin organizer SATB1, we identified a partial defect in Tcra gene rearrangement that was associated with reduced expression of Rag1 and Rag2 at the DP stage. SATB1 binds to the ASE and Rag promoters, facilitating inclusion of Rag2 in the chromatin hub and the loading of RNA polymerase II to both the Rag1 and Rag2 promoters. Our results provide a novel framework for understanding ASE function and demonstrate a novel role for SATB1 as a regulator of Rag locus organization and gene expression in DP thymocytes.
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Affiliation(s)
- Bingtao Hao
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Abani Kanta Naik
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Akiko Watanabe
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Hirokazu Tanaka
- RIKEN Centre for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan
| | - Liang Chen
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Hunter W Richards
- Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, Berkeley, CA 94720
| | - Motonari Kondo
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Ichiro Taniuchi
- RIKEN Centre for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan
| | - Yoshinori Kohwi
- Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, Berkeley, CA 94720
| | - Terumi Kohwi-Shigematsu
- Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, Berkeley, CA 94720
| | - Michael S Krangel
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
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146
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Wan F, Cheng C, Wang Z, Xiao X, Zeng H, Xing S, Chen X, Wang J, Li S, Zhang Y, Xiang W, Zhu Z, Johnson C, Zhu Z. SATB1 overexpression regulates the development and progression in bladder cancer through EMT. PLoS One 2015; 10:e0117518. [PMID: 25706386 PMCID: PMC4338074 DOI: 10.1371/journal.pone.0117518] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 12/26/2014] [Indexed: 12/31/2022] Open
Abstract
The global gene regulator Special AT-rich sequence-binding protein-1 (SATB1) has been reported to induce EMT-like changes and be associated with poor clinical outcome in several cancers. This study aims to evaluate whether SATB1 affects the biological behaviors of bladder transitional cell carcinoma (BTCC) and further elucidate if this effect works through an epithelial-mesenchymal transition (EMT) pathway. The expression of SATB1, E-cadherin (epithelial markers), vimentin (mesenchymal markers) in BTCC tissues and adjacent noncancerous tissues, as well as in two cell lines of bladder cancer were investigated. Whether the SATB1 expression is associated with clinicopathological factors or not was statistically analyzed. Cell invasion and migration, cell cycle, cell proliferation and apoptosis were evaluated in SATB1 knockdown and overexpressed cell lines. Our results showed that the expression of SATB1 was remarkably up-regulated both in BTCC tissues and in bladder cancer cell lines with high potential of metastasis. The results were also associated with EMT markers and poor prognosis of BTCC patients. Moreover, SATB1 induced EMT processes through downregulation of E-cadherin, upregulation of E-cadherin repressors (Snail, Slug and vimentin). SATB1 also promoted cell cycle progression, cell proliferation, cell invasion and cell migration, but did not alter cell survival. In conclusion, our results suggest that SATB1 plays a crucial role in the progression of bladder cancer by regulating genes controlling EMT processes. Further, it may be a novel therapeutic target for aggressive bladder cancers.
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Affiliation(s)
- Feng Wan
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Chao Cheng
- Department of General Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Zongwei Wang
- Department of Urology Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, Warren Building 317, Boston, MA, 02114, United States of America
| | - Xingyuan Xiao
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Hanqing Zeng
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Shian Xing
- Central Laboratory of Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Xuepan Chen
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Jin Wang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Sen Li
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Youpeng Zhang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Wei Xiang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
| | - Zhineng Zhu
- Department of Urology, Wuhan No.1 Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Cameron Johnson
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, CT, 06320, United States of America
| | - Zhaohui Zhu
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, PR China
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147
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Chen Z, Li Z, Li W, Zong Y, Zhu Y, Miao Y, Xu Z. SATB1 Promotes Pancreatic Cancer Growth and Invasion Depending on MYC Activation. Dig Dis Sci 2015; 60:3304-17. [PMID: 26108419 PMCID: PMC4621700 DOI: 10.1007/s10620-015-3759-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 06/10/2015] [Indexed: 12/15/2022]
Abstract
BACKGROUND SATB1 plays an important role in human malignant progression, inducing cancer cell proliferation and metastasis by regulating downstream gene expressions. However, little is known about the underlying mechanisms in which SATB1 promotes pancreatic cancer tumorigenesis. AIMS To investigate SATB1 expression levels and its biological functions in promoting pancreatic cancer growth and invasion. METHODS SATB1 expression levels were detected in seven human pancreatic cancer cell lines and 16 pairs of normal pancreatic/pancreatic cancer tissues using RT-PCR and western blot. SW1990 or Capan-1 cells stably knockdown (shRNA) or transiently knockdown (siRNA) SATB1 cells, and PANC-1 stably overexpressing SATB1 cells were investigated with MTT, EdU assay, flow cytometry, and transwell invasion assay for cell proliferation and invasion activity. The binding of SATB1 to MYC promoter region was examined using reporter assay. Expression of SATB1 in 68 pancreatic cancer samples was studied by immunohistochemical staining and scoring. RESULTS SATB1 was overexpressed in pancreatic cancer tissues samples, showing strong correlation with pancreatic cancer invasion depth and tumor staging. SATB1 induced MYC mRNA and protein expression; promoted pancreatic cancer cell growth; increased cell population in S phase; and enhanced pancreatic cancer cell invasion in vitro. On the other hand, SATB1 knockdown showed opposite effects. Furthermore, MYC blocking in SATB1-overexpressing cells attenuated the promotion of pancreatic cancer cell growth and invasion. Our data also indicated that SATB1 bound to specific promoter region of MYC. CONCLUSIONS SATB1 is overexpressed in pancreatic cancer, promoting cancer cell proliferation and invasion through the activation of MYC.
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Affiliation(s)
- Zheng Chen
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China
| | - Zengliang Li
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China ,Department of Gastrointestinal Surgery, Huai’an First People’s Hospital, Nanjing Medical University, 6 Beijing Road West, Huai’an, 223300 People’s Republic of China ,Department of General Surgery, Huai’an First People’s Hospital, Nanjing Medical University, Huai’an, People’s Republic of China
| | - Wei Li
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Department of Oncology, The First Affiliated Hospital of Soochow University, No. 1, Shizi Street, Suzhou City, 215006 People’s Republic of China
| | - Yang Zong
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China ,Department of General Surgery, Changshu No. 1 People’s Hospital, 1 Shuyuan Street, Changshu, 215500 People’s Republic of China
| | - Yi Zhu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China
| | - Yi Miao
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China
| | - Zekuan Xu
- Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029 People’s Republic of China ,Institute of Tumor Biology, Jiangsu Province Academy of Clinical Medicine, Nanjing, People’s Republic of China
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148
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Abstract
The special AT-rich sequence-binding proteins 1 and 2 (SATB1/2) are nuclear matrix associated proteins that are transcription factors involved in chromatin remodeling and gene regulation. Expression of the SATB2 gene is tissue-specific, and the only epithelial cells expressing SATB2 are the glandular cells of the lower gastrointestinal tract where its expression is regulated by microRNA-31 (miR-31) and miR-182. SATB2, along with its homolog SATB1, are thought to be involved in various cancers with their roles in this disease being specific to the type of cancer. Colorectal cancer (CRC) provides the largest association of SATB2 with cancer and the roles of SATB2 are better defined and more studied in CRC than in any other cancer type. SATB1 displays a negative association with SATB2 in CRC. The various studies that have investigated the involvement of SATB1 and 2 in CRC have produced consistent findings. Here, we form four major conclusions regarding the role of these proteins in CRC and their potential clinical value: (i) SATB2 is a sensitive marker to distinguish CRC from other cancer types, (ii) Reduced expression of SATB2 in CRC is associated with poor prognosis, (iii) High levels of SATB1 expression facilitate CRC and are associated with poor prognosis and (iv) Overexpression of miR-31 and -182 in CRC leads to more aggressive cancer. This review will describe several of the key investigations that established these conclusions and highlight results that offer opportunities for future research in the treatment and diagnosis of CRC.
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Affiliation(s)
- Jason Brocato
- Department of Environmental Medicine, New York University Langone Medical Center, Tuxedo, NY 10987, USA
| | - Max Costa
- Department of Environmental Medicine, New York University Langone Medical Center, Tuxedo, NY 10987, USA
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149
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Borghesi L. Hematopoiesis in steady-state versus stress: self-renewal, lineage fate choice, and the conversion of danger signals into cytokine signals in hematopoietic stem cells. THE JOURNAL OF IMMUNOLOGY 2014; 193:2053-8. [PMID: 25128551 DOI: 10.4049/jimmunol.1400936] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Long-term hematopoietic stem cells (LT-HSCs) replenish the innate and adaptive immune compartments throughout life. Although significant progress has defined the major transcription factors that regulate lineage specification, the architectural proteins that globally coordinate DNA methylation, histone modification, and changes in gene expression are poorly defined. Provocative new studies establish the chromatin organizer special AT-rich binding protein 1 (Satb1) as one such global regulator in LT-HSCs. Satb1 is a nuclear organizer that partitions chromatin through the formation of cage-like structures. By integrating epigenetic and transcriptional pathways, Satb1 coordinates LT-HSC division, self-renewal, and lymphoid potential. Unexpected among the assortment of genes under Satb1 control in hematopoietic stem cells (HSCs) are cytokines, a finding that takes on additional importance with the provocative finding that short-term HSCs and downstream multipotent progenitors are potent and biologically relevant cytokine secretors during stress-mediated hematopoiesis. Together, these studies reveal a new mechanism of fate regulation and an unforeseen functional capability of HSCs.
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Affiliation(s)
- Lisa Borghesi
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
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150
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Grzanka D, Gagat M, Izdebska M, Marszałek A. Expression of special AT-rich sequence-binding protein 1 is an independent prognostic factor in cutaneous T-cell lymphoma. Oncol Rep 2014; 33:250-66. [PMID: 25384658 DOI: 10.3892/or.2014.3597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 08/28/2014] [Indexed: 01/19/2023] Open
Abstract
Cutaneous T-cell lymphoma (CTCL) is a group of slowly progressive, lymphoproliferative disorders characterized by localization of neoplastic T lymphocytes to the skin. The most common type of CTCL is mycosis fungoides which has a mild clinical course with slow and long progression. The rate of progression is generally slow and takes many years but often remains unpredictable. Special AT-rich sequence-binding protein-1 (SATB1) is a global chromatin organizer which controls gene expression by folding and remodeling chromatin, but which also regulates the level of histone methylation and acetylation, important in differentiation and apoptosis. The aim of the present study was to determine if SATB1 may be considered a prognostic and predictive factor of CTCL. The results showed that moderate and high expression of SATB1 correlate with significantly better prognosis of CTCL patients. Moreover, we showed that downregulation of SATB1 in Jurkat cells caused their resistance to activation-induced cell death. In conclusion, SATB1 expression appears to be a strong candidate as a prognostic factor confirming the inner heterogeneous features of CTCLs.
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Affiliation(s)
- Dariusz Grzanka
- Department and Clinic of Dermatology, Sexually Transmitted Diseases and Immunodermatology, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, 85-092 Bydgoszcz, Poland
| | - Maciej Gagat
- Department of Histology and Embryology, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, 85-092 Bydgoszcz, Poland
| | - Magdalena Izdebska
- Department of Histology and Embryology, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, 85-092 Bydgoszcz, Poland
| | - Andrzej Marszałek
- Department of Clinical Pathomorphology, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, 85-092 Bydgoszcz, Poland
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