1
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Zhang R, Bu F, Wang Y, Huang M, Lin X, Wu C, Chen J, Huang Y, Wang H, Ye S, Hu X, Wang Q, Zheng L. LncRNA RP4-639F20.1 interacts with THRAP3 to attenuate atherosclerosis by regulating c-FOS in vascular smooth muscle cells proliferation and migration. Atherosclerosis 2023; 379:117183. [PMID: 37549548 DOI: 10.1016/j.atherosclerosis.2023.06.974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 06/29/2023] [Accepted: 06/29/2023] [Indexed: 08/09/2023]
Abstract
BACKGROUND AND AIMS The aberrant proliferation and migration of vascular smooth muscle cells (VSMCs) play an essential role in the pathogenesis of atherosclerosis (AS). Long noncoding RNAs (lncRNAs) have been reported as important regulators in a number of diseases. However, very little is known regarding the functional role of lncRNAs in governing proliferation and migration of VSMCs and AS development. METHODS Both in vitro and in vivo assays were performed to investigate the role of lncRNA in the pathophysiology of AS. Our previous lncRNA arrays revealed that lncRNA RP4-639F20.1 was significantly decreased in atherosclerotic plaques. Lentivirus overexpressing RP4-639F20.1 and lncRNA RP4-639F20.1 silencing vectors (Si-lnc-RP4-639F20.1) were constructed and transfected in VSMCs. The in vitro functions of lncRNA were analyzed by CCK-8 assays, EdU assays, scratch wound assays, transwell assays, qRT-PCR and Western blot analyses. RNA fluorescence in situ hybridization, immunoprecipitation and mRNA microarrays were used to explore the underlying mechanism. Adeno-associated-virus-9 (AAV9) overexpressing RP4-639F20.1 was constructed and injected intravenously into ApoE-/- mice to explore the role of lncRNA in vivo. RESULTS In vitro experiments showed that lncRNA RP4-639F20.1 interacted with THRAP3 and downregulated c-FOS expression. Both increase of lncRNA RP4-639F20.1 expression and knockdown of c-FOS inhibited the expression of MMP10 and VEGF-α in VSMCs and suppressed VSMCs proliferation and migration. In vivo experiments using ApoE-/- mice fed a high-fat diet demonstrated that lncRNA RP4-639F20.1 overexpression deterred atherosclerosis and decreased lipid levels in atherosclerotic lesions. Patients with coronary artery disease were found to have higher c-FOS levels than healthy individuals and c-FOS expression was positively correlated with the SYNTAX score of patients. CONCLUSIONS Overall, these data indicated that lncRNA RP4-639F20.1/THRAP3/c-FOS pathway protects against the development of atherosclerosis by suppressing VSMCs proliferation and migration. LncRNA RP4-639F20.1 and c-FOS could represent potential therapeutic targets to ameliorate atherosclerosis-related diseases.
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Affiliation(s)
- Ruyi Zhang
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China
| | - Fan Bu
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510260, People's Republic of China
| | - Yubing Wang
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510260, People's Republic of China
| | - Mei Huang
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510260, People's Republic of China
| | - Xiaomin Lin
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China
| | - Changmeng Wu
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China
| | - Juanjiang Chen
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510260, People's Republic of China
| | - Yiyi Huang
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China
| | - Haifang Wang
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China
| | - Shu Ye
- Cardiovascular Disease Translational Research Programme, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, 117599, Singapore; Shantou University Medical College, Shantou, 515041, China
| | - Xiumei Hu
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China.
| | - Qian Wang
- Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510260, People's Republic of China.
| | - Lei Zheng
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, People's Republic of China.
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Abstract
TRIP6, a member of the ZYXIN-family of LIM domain proteins, is a focal adhesion component. Trip6 deletion in the mouse, reported here, reveals a function in the brain: ependymal and choroid plexus epithelial cells are carrying, unexpectedly, fewer and shorter cilia, are poorly differentiated, and the mice develop hydrocephalus. TRIP6 carries numerous protein interaction domains and its functions require homodimerization. Indeed, TRIP6 disruption in vitro (in a choroid plexus epithelial cell line), via RNAi or inhibition of its homodimerization, confirms its function in ciliogenesis. Using super-resolution microscopy, we demonstrate TRIP6 localization at the pericentriolar material and along the ciliary axoneme. The requirement for homodimerization which doubles its interaction sites, its punctate localization along the axoneme, and its co-localization with other cilia components suggest a scaffold/co-transporter function for TRIP6 in cilia. Thus, this work uncovers an essential role of a LIM-domain protein assembly factor in mammalian ciliogenesis.
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3
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Norizadeh Abbariki T, Gonda Z, Kemler D, Urbanek P, Wagner T, Litfin M, Wang ZQ, Herrlich P, Kassel O. The LIM domain protein nTRIP6 modulates the dynamics of myogenic differentiation. Sci Rep 2021; 11:12904. [PMID: 34145356 PMCID: PMC8213751 DOI: 10.1038/s41598-021-92331-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 06/02/2021] [Indexed: 11/11/2022] Open
Abstract
The process of myogenesis which operates during skeletal muscle regeneration involves the activation of muscle stem cells, the so-called satellite cells. These then give rise to proliferating progenitors, the myoblasts which subsequently exit the cell cycle and differentiate into committed precursors, the myocytes. Ultimately, the fusion of myocytes leads to myofiber formation. Here we reveal a role for the transcriptional co-regulator nTRIP6, the nuclear isoform of the LIM-domain protein TRIP6, in the temporal control of myogenesis. In an in vitro model of myogenesis, the expression of nTRIP6 is transiently up-regulated at the transition between proliferation and differentiation, whereas that of the cytosolic isoform TRIP6 is not altered. Selectively blocking nTRIP6 function results in accelerated early differentiation followed by deregulated late differentiation and fusion. Thus, the transient increase in nTRIP6 expression appears to prevent premature differentiation. Accordingly, knocking out the Trip6 gene in satellite cells leads to deregulated skeletal muscle regeneration dynamics in the mouse. Thus, dynamic changes in nTRIP6 expression contributes to the temporal control of myogenesis.
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Affiliation(s)
- Tannaz Norizadeh Abbariki
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Zita Gonda
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Denise Kemler
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Pavel Urbanek
- Leibniz Institute for Age Research (Fritz Lipmann Institute, FLI), Jena, Germany
| | - Tabea Wagner
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Margarethe Litfin
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Zhao-Qi Wang
- Leibniz Institute for Age Research (Fritz Lipmann Institute, FLI), Jena, Germany
| | - Peter Herrlich
- Leibniz Institute for Age Research (Fritz Lipmann Institute, FLI), Jena, Germany
| | - Olivier Kassel
- Institute for Biological and Chemical Systems-Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
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4
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Ding L, Wen Y, Zhang X, Zhao F, Lv K, Shi JH, Shen S, Pan X. Transcriptional network constituted of CBP, Ku70, NOX2, and BAX prevents the cell death of necrosis, paraptosis, and apoptosis in human melanoma. Cell Death Discov 2021; 7:40. [PMID: 33637687 PMCID: PMC7910564 DOI: 10.1038/s41420-021-00417-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 01/03/2021] [Accepted: 02/03/2021] [Indexed: 11/20/2022] Open
Abstract
CREB-binding protein (CBP) is an acetyltransferase known to play multiple roles in the transcriptions of genes involving oxidative metabolism, cell cycle, DNA damage checkpoints, and cell death. In this study, CBP was found to positively regulate the expression of Ku70, and both CBP and Ku70 were found to negatively regulate the expression of NOX2, therefore, mitigating the intracellular ROS in human melanoma. Knocking down CBP or Ku70 induced necrotic and paraptotic cell death as indicated by high-level intracellular ROS, cytoplasmic vacuolization, and cell cycle arrest in the S phase. In addition, chromosomal condensations were also observed in the cells proceeding necrotic and paraptotic cell death, which was found to be related to the BAX-associated intrinsic pathway of apoptotic cell death, when Ku70 was decreased either by CBP depletion or by Ku70 depletion directly. Our results, therefore, supported the idea that CBP, Ku70, BAX, and NOX2 have formed a transcriptional network in the prevention of cell death of necrosis, paraptosis, and apoptosis in human melanoma.
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Affiliation(s)
- Liang Ding
- School of Medicine, Hebei University, Baoding, 071002, China
| | - Yalei Wen
- School of Medicine, Hebei University, Baoding, 071002, China
| | - Xin Zhang
- School of Medicine, Hebei University, Baoding, 071002, China
| | - Fang Zhao
- School of Medicine, Hebei University, Baoding, 071002, China
| | - Kenao Lv
- School of Life Science, Beijing Institute of Technology, Beijin, 100081, China
| | - Jian-Hong Shi
- Central Laboratory, Affiliated Hospital of Hebei University, Baoding, 071002, China
| | - Shigang Shen
- School of Chemistry and environmental Science, Hebei University, Baodin, 071002, China
| | - Xuefeng Pan
- School of Medicine, Hebei University, Baoding, 071002, China. .,School of Life Science, Beijing Institute of Technology, Beijin, 100081, China. .,School of Chemistry and environmental Science, Hebei University, Baodin, 071002, China.
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5
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Endogenous interaction profiling identifies DDX5 as an oncogenic coactivator of transcription factor Fra-1. Oncogene 2019; 38:5725-5738. [PMID: 31015574 DOI: 10.1038/s41388-019-0824-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 03/11/2019] [Accepted: 04/02/2019] [Indexed: 01/06/2023]
Abstract
Fra-1, a member of the activator protein 1 (AP-1) family, is overexpressed in triple-negative breast cancer (TNBC) and plays crucial roles in tumor growth. Here we report the identification of 118 proteins interacting with endogenous chromatin-bound Fra-1 in TNBC cells, highlighting DDX5 as the most enriched Fra-1-interacting protein. DDX5, a previously unrecognized protein in the Fra-1 transcriptional network, shows extensive overlap with Fra-1 cistrome and transcriptome that are highly associated with the TNBC cell growth. We provide evidence that DDX5 expression enhances Fra-1 transcriptional activity and potentiates Fra-1-driven cell proliferation. Furthermore, we show that the DDX5 target gene signature predicts poor clinical outcome in breast cancer patients. DDX5 protein level was higher in triple-negative basal-like tumors than in non-basal-like tumors, including luminal A, luminal B, and HER2-enriched subtypes. Collectively, by combining proteomic and genomic approaches we reveal a role for DDX5 as a regulatory protein of Fra-1 signaling and suggest DDX5 as a potential therapeutic target for TNBC.
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6
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Sono T, Akiyama H, Miura S, Deng JM, Shukunami C, Hiraki Y, Tsushima Y, Azuma Y, Behringer RR, Matsuda S. THRAP3 interacts with and inhibits the transcriptional activity of SOX9 during chondrogenesis. J Bone Miner Metab 2018; 36:410-419. [PMID: 28770354 DOI: 10.1007/s00774-017-0855-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 06/17/2017] [Indexed: 11/28/2022]
Abstract
Sex-determining region Y (Sry)-box (Sox)9 is required for chondrogenesis as a transcriptional activator of genes related to chondrocyte proliferation, differentiation, and cartilage-specific extracellular matrix. Although there have been studies investigating the Sox9-dependent transcriptional complexes, not all their components have been identified. In the present study, we demonstrated that thyroid hormone receptor-associated protein (THRAP)3 is a component of a SOX9 transcriptional complex by liquid chromatography mass spectrometric analysis of FLAG-tagged Sox9-binding proteins purified from FLAG-HA-tagged Sox9 knock-in mice. Thrap3 knockdown in ATDC5 chondrogenic cells increased the expression of Collagen type II alpha 1 chain (Col2a1) without affecting Sox9 expression. THRAP3 and SOX9 overexpression reduced Col2a1 levels to a greater degree than overexpression of SOX9 alone. The negative regulation of SOX9 transcriptional activity by THRAP3 was mediated by interaction between the proline-, glutamine-, and serine-rich domain of SOX9 and the innominate domain of THRAP3. These results indicate that THRAP3 negatively regulates SOX9 transcriptional activity as a cofactor of a SOX9 transcriptional complex during chondrogenesis.
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Affiliation(s)
- Takashi Sono
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Haruhiko Akiyama
- Department of Orthopaedic Surgery, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
| | - Shigenori Miura
- Laboratory of Cellular Differentiation, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Jian Min Deng
- Department of Genetics, University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, USA
| | - Chisa Shukunami
- Laboratory of Cellular Differentiation, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
- Department of Molecular Biology and Biochemistry, Division of Basic Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yuji Hiraki
- Laboratory of Cellular Differentiation, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yu Tsushima
- Pharmacology Research Department, Teijin Pharma Limited, Hino, Tokyo, Japan
| | - Yoshiaki Azuma
- Medical Science Department, Teijin Pharma Limited, Tokyo, Japan
| | - Richard R Behringer
- Department of Genetics, University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, USA
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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7
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Sala S, Ampe C. An emerging link between LIM domain proteins and nuclear receptors. Cell Mol Life Sci 2018; 75:1959-1971. [PMID: 29428964 PMCID: PMC11105726 DOI: 10.1007/s00018-018-2774-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 02/01/2018] [Accepted: 02/06/2018] [Indexed: 12/13/2022]
Abstract
Nuclear receptors are ligand-activated transcription factors that partake in several biological processes including development, reproduction and metabolism. Over the last decade, evidence has accumulated that group 2, 3 and 4 LIM domain proteins, primarily known for their roles in actin cytoskeleton organization, also partake in gene transcription regulation. They shuttle between the cytoplasm and the nucleus, amongst other as a consequence of triggering cells with ligands of nuclear receptors. LIM domain proteins act as important coregulators of nuclear receptor-mediated gene transcription, in which they can either function as coactivators or corepressors. In establishing interactions with nuclear receptors, the LIM domains are important, yet pleiotropy of LIM domain proteins and nuclear receptors frequently occurs. LIM domain protein-nuclear receptor complexes function in diverse physiological processes. Their association is, however, often linked to diseases including cancer.
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Affiliation(s)
- Stefano Sala
- Department of Biochemistry, Ghent University, Ghent, Belgium
| | - Christophe Ampe
- Department of Biochemistry, Ghent University, Ghent, Belgium.
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8
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Endres M, Kneitz S, Orth MF, Perera RK, Zernecke A, Butt E. Regulation of matrix metalloproteinases (MMPs) expression and secretion in MDA-MB-231 breast cancer cells by LIM and SH3 protein 1 (LASP1). Oncotarget 2018; 7:64244-64259. [PMID: 27588391 PMCID: PMC5325439 DOI: 10.18632/oncotarget.11720] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 08/09/2016] [Indexed: 01/27/2023] Open
Abstract
The process of tumor invasion requires degradation of extracellular matrix by proteolytic enzymes. Cancer cells form protrusive invadopodia, which produce and release matrix metalloproteinases (MMPs) to degrade the basement membrane thereby enabling metastasis. We investigated the effect of LASP1, a newly identified protein in invadopodia, on expression, secretion and activation of MMPs in invasive breast tumor cell lines. By analyzing microarray data of in-house generated control and LASP1-depleted MDA-MB-231 breast cancer cells, we observed downregulation of MMP1, -3 and -9 upon LASP1 depletion. This was confirmed by Western blot analysis. Conversely, rescue experiments restored in part MMP expression and secretion. The regulatory effect of LASP1 on MMP expression was also observed in BT-20 breast cancer cells as well as in prostate and bladder cancer cell lines. In line with bioinformatic FunRich analysis of our data, which mapped a high regulation of transcription factors by LASP1, public microarray data analysis detected a correlation between high LASP1 expression and enhanced c-Fos levels, a protein that is part of the transcription factor AP-1 and known to regulate MMP expression. Compatibly, in luciferase reporter assays, AP-1 showed a decreased transcriptional activity after LASP1 knockdown. Zymography assays and Western blot analysis revealed an additional promotion of MMP secretion into the extracellular matrix by LASP1, thus, most likely, altering the microenvironment during cancer progression. The newly identified role of LASP1 in regulating matrix degradation by affecting MMP transcription and secretion elucidated the migratory potential of LASP1 overexpressing aggressive tumor cells in earlier studies.
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Affiliation(s)
- Marcel Endres
- Institute of Experimental Biomedicine II, University Medical Clinic of Wuerzburg, Wuerzburg, Germany
| | - Susanne Kneitz
- Physiological Chemistry, Biozentrum, University of Wuerzburg, Am Hubland, Wuerzburg, Germany
| | - Martin F Orth
- Institute of Experimental Biomedicine II, University Medical Clinic of Wuerzburg, Wuerzburg, Germany
| | - Ruwan K Perera
- Institute of Experimental Biomedicine II, University Medical Clinic of Wuerzburg, Wuerzburg, Germany
| | - Alma Zernecke
- Institute of Experimental Biomedicine II, University Medical Clinic of Wuerzburg, Wuerzburg, Germany
| | - Elke Butt
- Institute of Experimental Biomedicine II, University Medical Clinic of Wuerzburg, Wuerzburg, Germany
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9
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Abstract
Glucocorticoid hormones (GC) regulate essential physiological functions including energy homeostasis, embryonic and postembryonic development, and the stress response. From the biomedical perspective, GC have garnered a tremendous amount of attention as highly potent anti-inflammatory and immunosuppressive medications indispensable in the clinic. GC signal through the GC receptor (GR), a ligand-dependent transcription factor whose structure, DNA binding, and the molecular partners that it employs to regulate transcription have been under intense investigation for decades. In particular, next-generation sequencing-based approaches have revolutionized the field by introducing a unified platform for a simultaneous genome-wide analysis of cellular activities at the level of RNA production, binding of transcription factors to DNA and RNA, and chromatin landscape and topology. Here we describe fundamental concepts of GC/GR function as established through traditional molecular and in vivo approaches and focus on the novel insights of GC biology that have emerged over the last 10 years from the rapidly expanding arsenal of system-wide genomic methodologies.
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Affiliation(s)
- Maria A Sacta
- Hospital for Special Surgery, The David Rosensweig Genomics Center, New York, NY 10021; .,Weill Cornell/Rockefeller/Sloan Kettering MD/PhD program, New York, NY 10021
| | - Yurii Chinenov
- Hospital for Special Surgery, The David Rosensweig Genomics Center, New York, NY 10021;
| | - Inez Rogatsky
- Hospital for Special Surgery, The David Rosensweig Genomics Center, New York, NY 10021; .,Weill Cornell/Rockefeller/Sloan Kettering MD/PhD program, New York, NY 10021
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10
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Greulich F, Hemmer MC, Rollins DA, Rogatsky I, Uhlenhaut NH. There goes the neighborhood: Assembly of transcriptional complexes during the regulation of metabolism and inflammation by the glucocorticoid receptor. Steroids 2016; 114:7-15. [PMID: 27192428 PMCID: PMC5052104 DOI: 10.1016/j.steroids.2016.05.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 05/09/2016] [Accepted: 05/11/2016] [Indexed: 01/04/2023]
Abstract
Glucocorticoids (GCs), as ligands for the glucocorticoid receptor (GR), represent one of the most effective and frequently used classes of drugs for anti-inflammatory and immunosuppressive therapy. In addition, its role in physiological and pathophysiological processes makes the GR an important research target. The past decades have yielded a wealth of insight into the physiological and pharmacological effects of GCs. Today's era of next generation sequencing techniques is now beginning to elucidate the molecular and genomic circuits underlying GR's cell type-specific actions. This review focuses on the concepts and insights gained from recent studies in two of the most important tissues for GC action: the liver (mediating GR's metabolic effects) and macrophages (as the main target of anti-inflammatory GC therapy). We summarize results obtained from transgenic mouse models, molecular and genome-wide studies to illustrate GR's complex interactions with DNA, chromatin, co-regulators and other transcription factors. Characterizing the cell type-specific transcriptional complexes assembled around GR will pave the road for the development of new anti-inflammatory and metabolic therapies in the future.
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Affiliation(s)
- Franziska Greulich
- Helmholtz Diabetes Center (HMGU) and German Center for Diabetes Research (DZD), IDO, Parkring 13, 85748 Garching, Munich, Germany
| | - M Charlotte Hemmer
- Helmholtz Diabetes Center (HMGU) and German Center for Diabetes Research (DZD), IDO, Parkring 13, 85748 Garching, Munich, Germany
| | - David A Rollins
- Hospital for Special Surgery, The David Rosensweig Genomics Center, 535 East 70th Street, New York, NY 10021, USA; Graduate Program in Immunology and Microbial Pathogenesis, Weill Cornell Graduate School of Medical Sciences, 1300 York Avenue, New York, NY 10021, USA
| | - Inez Rogatsky
- Hospital for Special Surgery, The David Rosensweig Genomics Center, 535 East 70th Street, New York, NY 10021, USA; Graduate Program in Immunology and Microbial Pathogenesis, Weill Cornell Graduate School of Medical Sciences, 1300 York Avenue, New York, NY 10021, USA
| | - N Henriette Uhlenhaut
- Helmholtz Diabetes Center (HMGU) and German Center for Diabetes Research (DZD), IDO, Parkring 13, 85748 Garching, Munich, Germany.
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11
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Kemler D, Dahley O, Roßwag S, Litfin M, Kassel O. The LIM domain protein nTRIP6 acts as a co-repressor for the transcription factor MEF2C in myoblasts. Sci Rep 2016; 6:27746. [PMID: 27292777 PMCID: PMC4904203 DOI: 10.1038/srep27746] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 05/23/2016] [Indexed: 12/17/2022] Open
Abstract
The transcription factor Myocyte enhancer factor 2C (MEF2C) plays a key role in the late differentiation of skeletal muscle progenitor cells, the so-called myoblasts. During myoblast differentiation, both MEF2C expression and transcriptional activity are regulated. We have reported that nTRIP6, the nuclear isoform of the focal adhesion LIM domain protein TRIP6, acts as an adaptor transcriptional co-activator for several transcription factors. It interacts with the promoter-bound transcription factors and consequently mediates the recruitment of other co-activators. Based on a described interaction between MEF2C and TRIP6 in a yeast-two-hybrid screen, we hypothesised a co-regulatory function of nTRIP6 for MEF2C. In proliferating myoblasts, nTRIP6 interacted with MEF2C and was recruited together with MEF2C to the MEF2-binding regions of the MEF2C target genes Myom2, Mb, Tnni2 and Des. Silencing nTRIP6 or preventing its interaction with MEF2C increased MEF2C transcriptional activity and increased the expression of these MEF2C target genes. Thus, nTRIP6 acts as a co-repressor for MEF2C. Mechanistically, nTRIP6 mediated the recruitment of the class IIa histone deacetylase HDAC5 to the MEF2C-bound promoters. In conclusion, our results unravel a transcriptional co-repressor function for nTRIP6. This adaptor co-regulator can thus exert either co-activator or co-repressor functions, depending on the transcription factor it interacts with.
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Affiliation(s)
- Denise Kemler
- Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - Oliver Dahley
- Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - Sven Roßwag
- Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - Margarethe Litfin
- Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - Olivier Kassel
- Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Karlsruhe, Germany
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12
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Schmitz ML, Kracht M. Cyclin-Dependent Kinases as Coregulators of Inflammatory Gene Expression. Trends Pharmacol Sci 2015; 37:101-113. [PMID: 26719217 DOI: 10.1016/j.tips.2015.10.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 10/22/2015] [Accepted: 10/23/2015] [Indexed: 12/22/2022]
Abstract
Cyclin-dependent kinases (CDKs) exert a variety of functions through regulation of the cell cycle and gene expression, thus implicating them in diverse biological processes. Recent studies have deciphered the molecular mechanisms employed by nuclear CDKs to support the expression of inflammatory mediators. Induced transcription of many proinflammatory genes is increased during the G1 phase of the cell cycle in a CDK-dependent manner. This process involves the cytokine-induced recruitment of CDK6 to the nuclear chromatin fraction where it associates with transcription factors of the NF-κB, STAT, and AP-1 families. The ability of CDK6 to trigger the expression of VEGF-A and p16(INK4A) and to recruit the NF-κB subunit p65 to its target sites is largely independent of its kinase function. The involvement of CDKs in proinflammatory gene expression also allows therapeutic targeting of their functions to interfere with tumor-promoting inflammation or chronic inflammatory diseases.
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Affiliation(s)
- M Lienhard Schmitz
- Institute of Biochemistry, Medical Faculty, Friedrichstrasse 24, Justus-Liebig-University, 35392 Giessen, Germany.
| | - Michael Kracht
- Rudolf-Buchheim-Institute for Pharmacology, Medical Faculty, Schubertstrasse 81, Justus-Liebig-University Giessen, 35392 Giessen, Germany.
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13
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ScreenFect A: an efficient and low toxic liposome for gene delivery to mesenchymal stem cells. Int J Pharm 2015; 488:1-11. [DOI: 10.1016/j.ijpharm.2015.04.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 03/31/2015] [Accepted: 04/16/2015] [Indexed: 12/15/2022]
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