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Fang Y, Tang W, Qu S, Li Z, Zhang X, Miao Y, Zeng Z, Huang H. RBBP7, regulated by SP1, enhances the Warburg effect to facilitate the proliferation of hepatocellular carcinoma cells via PI3K/AKT signaling. J Transl Med 2024; 22:170. [PMID: 38368381 PMCID: PMC10874528 DOI: 10.1186/s12967-024-04964-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 02/07/2024] [Indexed: 02/19/2024] Open
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is characterized by aggressive progression and elevated mortality rates. This study aimed to investigate the regulatory effects of RBBP7 on HCC pathogenesis and the underlying mechanisms. METHODS The expression and clinical feature of RBBP7 were evaluated using bioinformatics analysis and the assessment of clinical HCC samples. CCK8 and colony formation were employed to estimate cell proliferation function of RBBP7. Aerobic glycolysis levels of RBBP7 were evaluated by measuring ATP levels, lactic acid production, glucose uptake capacity, and the expression of relevant enzymes (PFKM, PKM2, and LDHA). The phosphorylation levels in PI3K/AKT signaling were measured by western blotting. The regulatory effect of transcription factors of specificity protein 1 (SP1) on RBBP7 mRNA expression was confirmed in dual-luciferase reporter assays and chromatin immunoprecipitation experiments. The proliferation- and glycolysis-associated proteins were assessed using immunofluorescence staining in vivo. RESULTS We found that RBBP7 is expressed at high levels in HCC and predicts poor survival. Functional assays showed that RBBP7 promoted HCC proliferation and glycolysis. Mechanistically, it was demonstrated that RBBP7 activates the PI3K/AKT pathway, a crucial pathway in glycolysis, contributing to the progression of HCC. The outcomes of the dual-luciferase assay further confirmed that SP1 is capable of activating the promoter of RBBP7. CONCLUSIONS RBBP7, which is up-regulated by SP1, promotes HCC cell proliferation and glycolysis through the PI3K/AKT pathway. The findings of this study suggest that RBBP7 is a potential biomarker for HCC.
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Affiliation(s)
- Yuan Fang
- Organ Transplantation Center, The First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, Yunnan, China
| | - WeiQiang Tang
- Institute of Clinical Medicine, Hengyang Medical School, The First Affiliated Hospital, University of South China, Hengyang, Hunan, People's Republic of China
| | - Siming Qu
- Organ Transplantation Center, The First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, Yunnan, China
| | - ZhiTao Li
- Organ Transplantation Center, The First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, Yunnan, China
| | - XiaoLi Zhang
- Gastrointestinal and Hernia Surgery, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - YingLei Miao
- Department of Gastroenterology, The First Affiliated Hospital of Kunming Medical University, Yunnan, People's Republic of China
- Yunnan Province Clinical Research Center for Digestive Diseases, Yunnan, People's Republic of China
| | - Zhong Zeng
- Organ Transplantation Center, The First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, Yunnan, China.
| | - HanFei Huang
- Organ Transplantation Center, The First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, Yunnan, China.
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2
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Li J, Zheng H, Hou J, Chen J, Zhang F, Yang X, Jin F, Xi Y. X-linked RBBP7 mutation causes maturation arrest and testicular tumors. J Clin Invest 2023; 133:e171541. [PMID: 37843278 PMCID: PMC10575721 DOI: 10.1172/jci171541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 08/24/2023] [Indexed: 10/17/2023] Open
Abstract
Maturation arrest (MA) is a subtype of non-obstructive azoospermia, and male infertility is a known risk factor for testicular tumors. However, the genetic basis for many affected individuals remains unknown. Here, we identified a deleterious hemizygous variant of X-linked retinoblastoma-binding protein 7 (RBBP7) as a potential key cause of MA, which was also found to be associated with the development of Leydig cell tumors. This mutation resulted in premature protein translation termination, affecting the sixth WD40 domain of the RBBP7 and the interaction of the mutated RBBP7 with histone H4. Decreased BRCA1 and increased γH2AX were observed in the proband. In mouse spermatogonial and pachytene spermatocyte-derived cells, deprivation of rbbp7 led to cell cycle arrest and apoptosis. In Drosophila, knockdown of RBBP7/Caf1-55 in germ cells resulted in complete absence of germ cells and reduced testis size, whereas knockdown of RBBP7/Caf1-55 in cyst cells resulted in hyperproliferative testicular cells. Interestingly, male infertility caused by Caf1-55 deficiency was rescued by ectopic expression of wild-type human RBBP7 but not mutant variants, suggesting the importance of RBBP7 in spermatogenesis. Our study provides insights into the mechanisms underlying the co-occurrence of MA and testicular tumors and may pave the way for innovative genetic diagnostics of these 2 diseases.
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Affiliation(s)
- Jingping Li
- Department of Reproductive Endocrinology and
| | - Huimei Zheng
- Division of Human Reproduction and Developmental Genetics, Reproductive Medicine Center, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jiaru Hou
- Division of Human Reproduction and Developmental Genetics, Reproductive Medicine Center, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Zhejiang University School of Medicine, Hangzhou, China
| | - Jianhua Chen
- Department of Pathology, Reproductive Medicine Center, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | | | - Xiaohang Yang
- Division of Human Reproduction and Developmental Genetics, Reproductive Medicine Center, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Zhejiang University School of Medicine, Hangzhou, China
| | - Fan Jin
- Department of Reproductive Endocrinology and
| | - Yongmei Xi
- Division of Human Reproduction and Developmental Genetics, Reproductive Medicine Center, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Zhejiang University School of Medicine, Hangzhou, China
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3
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Guo L, Xia Y, Li H, Wang Z, Xu H, Dai X, Zhang Y, Zhang H, Fan W, Wei F, Li Q, Zhang L, Cao L, Zhang S, Hu W, Gu H. FIT links c-Myc and P53 acetylation by recruiting RBBP7 during colorectal carcinogenesis. Cancer Gene Ther 2023; 30:1124-1133. [PMID: 37225855 DOI: 10.1038/s41417-023-00624-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 04/07/2023] [Accepted: 05/04/2023] [Indexed: 05/26/2023]
Abstract
Colorectal cancer (CRC) poses one of the most serious threats to human health worldwide, and abnormally expressed c-Myc and p53 are deemed the pivotal driving forces of CRC progression. In this study, we discovered that the lncRNA FIT, which was downregulated in CRC clinical samples, was transcriptionally suppressed by c-Myc in vitro and promoted CRC cell apoptosis by inducing FAS expression. FAS is a p53 target gene, and we found that FIT formed a trimer with RBBP7 and p53 that facilitated p53 acetylation and p53-mediated FAS gene transcription. Moreover, FIT was capable of retarding CRC growth in a mouse xenograft model, and FIT expression was positively correlated with FAS expression in clinical samples. Thus, our study elucidates the role of the lncRNA FIT in human colorectal cancer growth and provides a potential target for anti-CRC drugs.
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Affiliation(s)
- Lili Guo
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Yang Xia
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Hao Li
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Zifei Wang
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Hui Xu
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Xiangyu Dai
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Yaqin Zhang
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Hao Zhang
- Department of Gastrointestinal Surgery, Department of General Surgery, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Wenhu Fan
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Feng Wei
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Qun Li
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Ling Zhang
- Department of Critical Care Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Limian Cao
- Department of Critical Care Medicine, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Shangxin Zhang
- Department of Gastrointestinal Surgery, Department of General Surgery, First Affiliated Hospital of Anhui Medical University, Hefei, China.
| | - Wanglai Hu
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China.
- Translational Research Institute, People's Hospital of Zhengzhou University, Academy of Medical Science, Henan International Joint Laboratory of Non-coding RNA and Metabolism in Cancer, Zhengzhou University, Zhengzhou, China.
| | - Hao Gu
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China.
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4
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Dave N, Vural AS, Piras IS, Winslow W, Surendra L, Winstone JK, Beach TG, Huentelman MJ, Velazquez R. Identification of retinoblastoma binding protein 7 (Rbbp7) as a mediator against tau acetylation and subsequent neuronal loss in Alzheimer's disease and related tauopathies. Acta Neuropathol 2021; 142:279-294. [PMID: 33978814 PMCID: PMC8270842 DOI: 10.1007/s00401-021-02323-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/14/2021] [Accepted: 05/01/2021] [Indexed: 12/14/2022]
Abstract
Evidence indicates that tau hyper-phosphorylation and subsequent neurofibrillary tangle formation contribute to the extensive neuronal death in Alzheimer's disease (AD) and related tauopathies. Recent work has identified that increased tau acetylation can promote tau phosphorylation. Tau acetylation occurs at lysine 280 resulting from increased expression of the lysine acetyltransferase p300. The exact upstream mechanisms mediating p300 expression remain elusive. Additional work highlights the role of the epigenome in tau pathogenesis, suggesting that dysregulation of epigenetic proteins may contribute to acetylation and hyper-phosphorylation of tau. Here, we identify and focus on the histone-binding subunit of the Nucleosome Remodeling and Deacetylase (NuRD) complex: Retinoblastoma-Binding Protein 7 (Rbbp7). Rbbp7 chaperones chromatin remodeling proteins to their nuclear histone substrates, including histone acetylases and deacetylases. Notably, Rbbp7 binds to p300, suggesting that it may play a role in modulating tau acetylation. We interrogated Rbbp7 in post-mortem brain tissue, cell lines and mouse models of AD. We found reduced Rbbp7 mRNA expression in AD cases, a significant negative correlation with CERAD (neuritic plaque density) and Braak Staging (pathogenic tau inclusions) and a significant positive correlation with post-mortem brain weight. We also found a neuron-specific downregulation of Rbbp7 mRNA in AD patients. Rbbp7 protein levels were significantly decreased in 3xTg-AD and PS19 mice compared to NonTg, but no decreases were found in APP/PS1 mice that lack tau pathology. In vitro, Rbbp7 overexpression rescued TauP301L-induced cytotoxicity in immortalized hippocampal cells and primary cortical neurons. In vivo, hippocampal Rbbp7 overexpression rescued neuronal death in the CA1 of PS19 mice. Mechanistically, we found that increased Rbbp7 reduced p300 levels, tau acetylation at lysine 280 and tau phosphorylation at AT8 and AT100 sites. Collectively, these data identify a novel role of Rbbp7, protecting against tau-related pathologies, and highlight its potential as a therapeutic target in AD and related tauopathies.
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Affiliation(s)
- Nikhil Dave
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Austin S Vural
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Ignazio S Piras
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, AZ, USA
- Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Wendy Winslow
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Likith Surendra
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Joanna K Winstone
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Thomas G Beach
- Arizona Alzheimer's Consortium, Phoenix, AZ, USA
- Civin Laboratory for Neuropathology, Banner Sun Health Research Institute, Sun City, AZ, USA
| | - Matthew J Huentelman
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, AZ, USA
- Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Ramon Velazquez
- Arizona State University-Banner Neurodegenerative Disease Research Center at the Biodesign Institute, Arizona State University, Tempe, AZ, USA.
- Arizona Alzheimer's Consortium, Phoenix, AZ, USA.
- School of Life Sciences, Arizona State University, Tempe, AZ, USA.
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5
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Mayor-Ruiz C, Bauer S, Brand M, Kozicka Z, Siklos M, Imrichova H, Kaltheuner IH, Hahn E, Seiler K, Koren A, Petzold G, Fellner M, Bock C, Müller AC, Zuber J, Geyer M, Thomä NH, Kubicek S, Winter GE. Rational discovery of molecular glue degraders via scalable chemical profiling. Nat Chem Biol 2020; 16:1199-1207. [PMID: 32747809 PMCID: PMC7116640 DOI: 10.1038/s41589-020-0594-x] [Citation(s) in RCA: 171] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/15/2020] [Indexed: 11/09/2022]
Abstract
Targeted protein degradation is a new therapeutic modality based on drugs that destabilize proteins by inducing their proximity to E3 ubiquitin ligases. Of particular interest are molecular glues that can degrade otherwise unligandable proteins by orchestrating direct interactions between target and ligase. However, their discovery has so far been serendipitous, thus hampering broad translational efforts. Here, we describe a scalable strategy toward glue degrader discovery that is based on chemical screening in hyponeddylated cells coupled to a multi-omics target deconvolution campaign. This approach led us to identify compounds that induce ubiquitination and degradation of cyclin K by prompting an interaction of CDK12-cyclin K with a CRL4B ligase complex. Notably, this interaction is independent of a dedicated substrate receptor, thus functionally segregating this mechanism from all described degraders. Collectively, our data outline a versatile and broadly applicable strategy to identify degraders with nonobvious mechanisms and thus empower future drug discovery efforts.
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Affiliation(s)
- Cristina Mayor-Ruiz
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Sophie Bauer
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Matthias Brand
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Zuzanna Kozicka
- FMI Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
- Faculty of Science, University of Basel, Basel, Switzerland
| | - Marton Siklos
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Hana Imrichova
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | | | - Elisa Hahn
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Kristina Seiler
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Anna Koren
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Georg Petzold
- FMI Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Michaela Fellner
- Research Institute of Molecular Pathology, Vienna BioCenter, Vienna, Austria
| | - Christoph Bock
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - André C Müller
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Johannes Zuber
- Research Institute of Molecular Pathology, Vienna BioCenter, Vienna, Austria
| | - Matthias Geyer
- Institute of Structural Biology, University of Bonn, Bonn, Germany
| | - Nicolas H Thomä
- FMI Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Stefan Kubicek
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Georg E Winter
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria.
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6
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Schmidberger JW, Sharifi Tabar M, Torrado M, Silva APG, Landsberg MJ, Brillault L, AlQarni S, Zeng YC, Parker BL, Low JKK, Mackay JP. The MTA1 subunit of the nucleosome remodeling and deacetylase complex can recruit two copies of RBBP4/7. Protein Sci 2016; 25:1472-82. [PMID: 27144666 PMCID: PMC4972203 DOI: 10.1002/pro.2943] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 05/02/2016] [Indexed: 11/05/2022]
Abstract
The nucleosome remodeling and deacetylase (NuRD) complex remodels the genome in the context of both gene transcription and DNA damage repair. It is essential for normal development and is distributed across multiple tissues in organisms ranging from mammals to nematode worms. In common with other chromatin-remodeling complexes, however, its molecular mechanism of action is not well understood and only limited structural information is available to show how the complex is assembled. As a step towards understanding the structure of the NuRD complex, we have characterized the interaction between two subunits: the metastasis associated protein MTA1 and the histone-binding protein RBBP4. We show that MTA1 can bind to two molecules of RBBP4 and present negative stain electron microscopy and chemical crosslinking data that allow us to build a low-resolution model of an MTA1-(RBBP4)2 subcomplex. These data build on our understanding of NuRD complex structure and move us closer towards an understanding of the biochemical basis for the activity of this complex.
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Affiliation(s)
| | | | - Mario Torrado
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Ana P. G. Silva
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Michael J. Landsberg
- School of Chemistry and Molecular BiosciencesUniversity of QueenslandQldAustralia
| | - Lou Brillault
- Institute for Molecular Bioscience, University of QueenslandQldAustralia
| | - Saad AlQarni
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Yi Cheng Zeng
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Benjamin L. Parker
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Jason K. K. Low
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
| | - Joel P. Mackay
- School of Life and Environmental SciencesUniversity of SydneyNSWAustralia
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7
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Dubuissez M, Loison I, Paget S, Vorng H, Ait-Yahia S, Rohr O, Tsicopoulos A, Leprince D. Protein Kinase C-Mediated Phosphorylation of BCL11B at Serine 2 Negatively Regulates Its Interaction with NuRD Complexes during CD4+ T-Cell Activation. Mol Cell Biol 2016; 36:1881-98. [PMID: 27161321 PMCID: PMC4911745 DOI: 10.1128/mcb.00062-16] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 02/16/2016] [Accepted: 05/03/2016] [Indexed: 12/17/2022] Open
Abstract
The transcription factor BCL11B/CTIP2 is a major regulatory protein implicated in various aspects of development, function and survival of T cells. Mitogen-activated protein kinase (MAPK)-mediated phosphorylation and SUMOylation modulate BCL11B transcriptional activity, switching it from a repressor in naive murine thymocytes to a transcriptional activator in activated thymocytes. Here, we show that BCL11B interacts via its conserved N-terminal MSRRKQ motif with endogenous MTA1 and MTA3 proteins to recruit various NuRD complexes. Furthermore, we demonstrate that protein kinase C (PKC)-mediated phosphorylation of BCL11B Ser2 does not significantly impact BCL11B SUMOylation but negatively regulates NuRD recruitment by dampening the interaction with MTA1 or MTA3 (MTA1/3) and RbAp46 proteins. We detected increased phosphorylation of BCL11B Ser2 upon in vivo activation of transformed and primary human CD4(+) T cells. We show that following activation of CD4(+) T cells, BCL11B still binds to IL-2 and Id2 promoters but activates their transcription by recruiting P300 instead of MTA1. Prolonged stimulation results in the direct transcriptional repression of BCL11B by KLF4. Our results unveil Ser2 phosphorylation as a new BCL11B posttranslational modification linking PKC signaling pathway to T-cell receptor (TCR) activation and define a simple model for the functional switch of BCL11B from a transcriptional repressor to an activator during TCR activation of human CD4(+) T cells.
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Affiliation(s)
- Marion Dubuissez
- Université Lille, CNRS, Institut Pasteur de Lille, UMR 8161, Mechanisms of Tumorigenesis and Targeted Therapies (M3T), Lille, France
| | - Ingrid Loison
- Université Lille, CNRS, Institut Pasteur de Lille, UMR 8161, Mechanisms of Tumorigenesis and Targeted Therapies (M3T), Lille, France
| | - Sonia Paget
- Université Lille, CNRS, Institut Pasteur de Lille, UMR 8161, Mechanisms of Tumorigenesis and Targeted Therapies (M3T), Lille, France
| | - Han Vorng
- Université Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, U1019, UMR8204, Center for Infection and Immunity of Lille (CIIL), Lille, France
| | - Saliha Ait-Yahia
- Université Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, U1019, UMR8204, Center for Infection and Immunity of Lille (CIIL), Lille, France
| | - Olivier Rohr
- University of Strasbourg, IUT Louis Pasteur, EA7292, Dynamic of Host Pathogen Interactions, Institute of Parasitology and Tropical Pathology, Strasbourg, France Institut Universitaire de France, Paris, France
| | - Anne Tsicopoulos
- Université Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, U1019, UMR8204, Center for Infection and Immunity of Lille (CIIL), Lille, France
| | - Dominique Leprince
- Université Lille, CNRS, Institut Pasteur de Lille, UMR 8161, Mechanisms of Tumorigenesis and Targeted Therapies (M3T), Lille, France
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8
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Sandoval-Hernández AG, Hernández HG, Restrepo A, Muñoz JI, Bayon GF, Fernández AF, Fraga MF, Cardona-Gómez GP, Arboleda H, Arboleda GH. Liver X Receptor Agonist Modifies the DNA Methylation Profile of Synapse and Neurogenesis-Related Genes in the Triple Transgenic Mouse Model of Alzheimer's Disease. J Mol Neurosci 2015; 58:243-53. [PMID: 26553261 DOI: 10.1007/s12031-015-0665-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 10/08/2015] [Indexed: 12/22/2022]
Abstract
The liver X receptor agonist, GW3965, improves cognition in Alzheimer's disease (AD) mouse models. Here, we determined if short-term GW3965 treatment induces changes in the DNA methylation state of the hippocampus, which are associated with cognitive improvement. Twenty-four-month-old triple-transgenic AD (3xTg-AD) mice were treated with GW3965 (50 mg/kg/day for 6 days). DNA methylation state was examined by modified bisulfite conversion and hybridization on Illumina Infinium Methylation BeadChip 450 k arrays. The Morris water maze was used for behavioral analysis. Our results show in addition to improvement in cognition methylation changes in 39 of 13,715 interrogated probes in treated 3xTg-AD mice compared with untreated 3xTg-AD mice. These changes in methylation probes include 29 gene loci. Importantly, changes in methylation status were mainly from synapse-related genes (SYP, SYN1, and DLG3) and neurogenesis-associated genes (HMGB3 and RBBP7). Thus, our results indicate that liver X receptors (LXR) agonist treatment induces rapid changes in DNA methylation, particularly in loci associated with genes involved in neurogenesis and synaptic function. Our results suggest a new potential mechanism to explain the beneficial effect of GW3965.
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Affiliation(s)
- A G Sandoval-Hernández
- Grupo de Muerte Celular, Instituto de Genética, Universidad Nacional de Colombia, Bogotá, Colombia
| | - H G Hernández
- Grupo de Neurociencias, Universidad Nacional, Bogotá, Colombia
| | - A Restrepo
- Grupo de Muerte Celular, Instituto de Genética, Universidad Nacional de Colombia, Bogotá, Colombia
| | - J I Muñoz
- Área de Neurobiología Celular y Molecular, Grupo de Neurociencias de Antioquia, Universidad de Antioquia, Medellín, Colombia
| | - G F Bayon
- Cancer Epigenetics Laboratory, Institute of Oncology of Asturias (IUOPA), Hospital Universitario Central de Asturias (HUCA), Universidad de Oviedo, Oviedo, Spain
| | - A F Fernández
- Cancer Epigenetics Laboratory, Institute of Oncology of Asturias (IUOPA), Hospital Universitario Central de Asturias (HUCA), Universidad de Oviedo, Oviedo, Spain
| | - M F Fraga
- Cancer Epigenetics Laboratory, Institute of Oncology of Asturias (IUOPA), Hospital Universitario Central de Asturias (HUCA), Universidad de Oviedo, Oviedo, Spain
| | - G P Cardona-Gómez
- Área de Neurobiología Celular y Molecular, Grupo de Neurociencias de Antioquia, Universidad de Antioquia, Medellín, Colombia
| | - H Arboleda
- Grupo de Neurociencias, Universidad Nacional, Bogotá, Colombia
| | - Gonzalo H Arboleda
- Grupo de Muerte Celular, Instituto de Genética, Universidad Nacional de Colombia, Bogotá, Colombia.
- Departamento de Patología, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, Colombia.
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9
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Alqarni SSM, Murthy A, Zhang W, Przewloka MR, Silva APG, Watson AA, Lejon S, Pei XY, Smits AH, Kloet SL, Wang H, Shepherd NE, Stokes PH, Blobel GA, Vermeulen M, Glover DM, Mackay JP, Laue ED. Insight into the architecture of the NuRD complex: structure of the RbAp48-MTA1 subcomplex. J Biol Chem 2014; 289:21844-55. [PMID: 24920672 PMCID: PMC4139204 DOI: 10.1074/jbc.m114.558940] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 05/30/2014] [Indexed: 12/22/2022] Open
Abstract
The nucleosome remodeling and deacetylase (NuRD) complex is a widely conserved transcriptional co-regulator that harbors both nucleosome remodeling and histone deacetylase activities. It plays a critical role in the early stages of ES cell differentiation and the reprogramming of somatic to induced pluripotent stem cells. Abnormalities in several NuRD proteins are associated with cancer and aging. We have investigated the architecture of NuRD by determining the structure of a subcomplex comprising RbAp48 and MTA1. Surprisingly, RbAp48 recognizes MTA1 using the same site that it uses to bind histone H4, showing that assembly into NuRD modulates RbAp46/48 interactions with histones. Taken together with other results, our data show that the MTA proteins act as scaffolds for NuRD complex assembly. We further show that the RbAp48-MTA1 interaction is essential for the in vivo integration of RbAp46/48 into the NuRD complex.
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Affiliation(s)
- Saad S M Alqarni
- From the School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia
| | - Andal Murthy
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Wei Zhang
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Marcin R Przewloka
- Department of Genetics, University of Cambridge, CB2 3EH, United Kingdom
| | - Ana P G Silva
- From the School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia
| | - Aleksandra A Watson
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Sara Lejon
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Xue Y Pei
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Arne H Smits
- Department of Molecular Cancer Research, UMC Utrecht, Universiteitsweg 100, 3584CG Utrecht, The Netherlands, and
| | - Susan L Kloet
- Department of Molecular Cancer Research, UMC Utrecht, Universiteitsweg 100, 3584CG Utrecht, The Netherlands, and
| | - Hongxin Wang
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104
| | - Nicholas E Shepherd
- From the School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia
| | - Philippa H Stokes
- From the School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia
| | - Gerd A Blobel
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104
| | - Michiel Vermeulen
- Department of Molecular Cancer Research, UMC Utrecht, Universiteitsweg 100, 3584CG Utrecht, The Netherlands, and
| | - David M Glover
- Department of Genetics, University of Cambridge, CB2 3EH, United Kingdom
| | - Joel P Mackay
- From the School of Molecular Bioscience, University of Sydney, New South Wales 2006, Australia,
| | - Ernest D Laue
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom,
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10
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Shore AN, Kabotyanski EB, Roarty K, Smith MA, Zhang Y, Creighton CJ, Dinger ME, Rosen JM. Pregnancy-induced noncoding RNA (PINC) associates with polycomb repressive complex 2 and regulates mammary epithelial differentiation. PLoS Genet 2012; 8:e1002840. [PMID: 22911650 PMCID: PMC3406180 DOI: 10.1371/journal.pgen.1002840] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Accepted: 06/01/2012] [Indexed: 02/07/2023] Open
Abstract
Pregnancy-induced noncoding RNA (PINC) and retinoblastoma-associated protein 46 (RbAp46) are upregulated in alveolar cells of the mammary gland during pregnancy and persist in alveolar cells that remain in the regressed lobules following involution. The cells that survive involution are thought to function as alveolar progenitor cells that rapidly differentiate into milk-producing cells in subsequent pregnancies, but it is unknown whether PINC and RbAp46 are involved in maintaining this progenitor population. Here, we show that, in the post-pubertal mouse mammary gland, mPINC is enriched in luminal and alveolar progenitors. mPINC levels increase throughout pregnancy and then decline in early lactation, when alveolar cells undergo terminal differentiation. Accordingly, mPINC expression is significantly decreased when HC11 mammary epithelial cells are induced to differentiate and produce milk proteins. This reduction in mPINC levels may be necessary for lactation, as overexpression of mPINC in HC11 cells blocks lactogenic differentiation, while knockdown of mPINC enhances differentiation. Finally, we demonstrate that mPINC interacts with RbAp46, as well as other members of the polycomb repressive complex 2 (PRC2), and identify potential targets of mPINC that are differentially expressed following modulation of mPINC expression levels. Taken together, our data suggest that mPINC inhibits terminal differentiation of alveolar cells during pregnancy to prevent abundant milk production and secretion until parturition. Additionally, a PRC2 complex that includes mPINC and RbAp46 may confer epigenetic modifications that maintain a population of mammary epithelial cells committed to the alveolar fate in the involuted gland. During pregnancy, epithelial cells of the mammary gland begin to undergo differentiation into functional alveolar cells that, during lactation, will produce and secrete milk proteins, thereby providing nourishment to offspring. Following lactation, the majority of alveolar cells die and the mammary gland remodels to a pre-pregnancy-like state in a process called involution. However, some alveolar cells survive involution, and these cells are thought to serve as alveolar progenitors that are able to rapidly proliferate and differentiate into milk-producing cells in subsequent pregnancies. Keeping alveolar cells from undergoing terminal differentiation during pregnancy and involution is vital for the preservation of an alveolar progenitor population. Here, we show that the long noncoding RNA, PINC, is downregulated in the mammary gland between late pregnancy and early lactation, when alveolar cells begin to terminally differentiate. This reduction of PINC levels may be necessary for lactation, as overexpression of PINC inhibits differentiation, while knockdown of PINC enhances differentiation of mammary epithelial cells. Finally, we find that PINC interacts with the chromatin-modifying complex PRC2, suggesting epigenetic regulation may be involved in maintaining alveolar progenitors in the pregnant and involuting mammary gland. These results emphasize the potential importance of lncRNA-PRC2 involvement in regulating cell fate during development.
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Affiliation(s)
- Amy N. Shore
- Program in Developmental Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Elena B. Kabotyanski
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Kevin Roarty
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Martin A. Smith
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Yiqun Zhang
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, United States of America
| | - Chad J. Creighton
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas, United States of America
| | - Marcel E. Dinger
- Diamantina Institute, The University of Queensland, Princess Alexandra Hospital, Brisbane, Australia
| | - Jeffrey M. Rosen
- Program in Developmental Biology, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
- * E-mail:
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11
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Jeon J, Kim J. FVE, an Arabidopsis homologue of the retinoblastoma-associated protein that regulates flowering time and cold response, binds to chromatin as a large multiprotein complex. Mol Cells 2011; 32:227-34. [PMID: 21710206 PMCID: PMC3887629 DOI: 10.1007/s10059-011-1022-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 05/26/2011] [Accepted: 05/27/2011] [Indexed: 11/24/2022] Open
Abstract
Some genetic studies indicate that plant homologues of proteins involved in chromatin modification and remodeling in other organisms may regulate plant development. Previously, we described an Arabidopsis mutant with altered cold-responsive gene expression (acg1) displaying a late flowering phenotype, a null allele of fve. FVE is a homologue of the mammalian retinoblastoma-associated protein (RbAp), one component of a histone deacetylase (HDAC) complex involved in transcriptional repression, and has been shown to be involved in the deacetylation of the FLOWERING LOCUS C (FLC) chromatin encoding for a repressor of flowering. In an effort to gain insight into the biochemical functions of FVE, we overexpressed FVE tagged with the hemagglutinin (HA) and FLAG epitope at the N-terminus in acg1 mutants. The results of physiological and molecular analyses demonstrated that FVE overexpression in acg1 rescued the mutant phenotypes, including late flowering and alterations in floral pathway gene expression such as FLC, SUPPRESSOR OF OVEREXPRESSION OF CO1 (SOC1), and FLOWERING LOCUS T (FT), and also super-induced cold-responsive reporter gene expression. The chromatin immunoprecipitation experiments revealed the amplification of specific DNA regions of FLC and COLD-REGULATED 15A (COR15A), indicating that FVE may bind to the FLC and COR15A chromatin. Gel-filtration chromatography and the immunoprecipitation of putative FVE complexes showed that FVE forms a protein complex of approximately 1.0 MDa. These results demonstrate that FVE may exist as a multiprotein complex, similar to the mammalian HDAC complex harboring RbAp, to regulate flowering time and cold response by associating with the FLC and COR chromatin.
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Affiliation(s)
- Jin Jeon
- Department of Plant Biotechnology, Chonnam National University, Gwangju 500-757, Korea
| | - Jungmook Kim
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Korea
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