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Janket SJ, Qureshi M, Bascones-Martinez A, González-Febles J, Meurman JH. Holistic paradigm in carcinogenesis: Genetics, epigenetics, immunity, inflammation and oral infections. World J Immunol 2017; 7:11-23. [DOI: 10.5411/wji.v7.i2.11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 02/25/2017] [Accepted: 04/07/2017] [Indexed: 02/05/2023] Open
Abstract
Recent debate among the experts of cancer research regarding the main causes of carcinogenesis encouraged us to review the etiology of cancer pathogenesis. The somatic mutation theory attributes carcinogenesis to random errors in DNA multiplication while the tissue organization field theory ascribes causation to environmental factors. We recognize complexity in cancer pathogenesis and accept the premise of both DNA multiplication errors and environmental factors in cancer development. Furthermore, it should also be noted that the combination of these factors and the relative importance of the each differ in various types of cancers. For example, in some cancers, genetics plays a prominent role while in others environment such as obesity plays a much stronger role. Additionally, the cancer mitigating factors should also be considered. The balance of cancer-enhancing and cancer-suppressing forces determines the cancer incidence. Ultimately, identifying the lifestyle factors that revise somatic mutations or epigenetic alterations will lead to a clear understanding of pathogenic mechanisms of cancer and to the optimal preventive strategies. This narrative review evaluates the published evidence on carcinogenesis pertaining to the whole organism (thus, holistic) incorporating genetics, epigenetics, immunology, inflammation and infections with emphasis on oral infections.
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52
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Li M, Zhi L, Zhang Z, Bian W, Qiu Y. Identification of potential target genes associated with the pathogenesis of osteoarthritis using microarray based analysis. Mol Med Rep 2017; 16:2799-2806. [PMID: 28714028 DOI: 10.3892/mmr.2017.6928] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 05/26/2017] [Indexed: 11/05/2022] Open
Abstract
The aim of the present study was to investigate the molecular circuitry of osteoarthritis (OA) and identify more potential target genes for OA treatment. Microarray data of GSE32317 was downloaded from the National Center for Biotechnology Information Gene Expression Omnibus database. Differentially expressed genes (DEGs) were identified in samples of synovial membrane from patients with early stage of knee OA (OA_Early) and late stage of knee OA (OA_End) that were compared with healthy specimens. Bioinformatics analysis was applied to analyze the significant functions and pathways that were enriched by the common DEGs identified in OA_Early and OA_End samples. Furthermore, a protein‑protein interaction (PPI) network was constructed and significant modules were extracted. Transcription factors (TFs) that could regulate genes in the significant modules were identified. A total of 1,207 and 1,575 DEGs were identified in OA_Early and OA_End samples compared with healthy samples, respectively. A total of 740 genes were upregulated and 308 genes were downregulated across the OA_Early and OA_End samples. These common DEGs were enriched in different gene ontology terms and pathways, such as immune response. Angiotensinogen (AGT) and C‑X‑C motif chemokine ligand 12 (CXCL12) were identified to be hub proteins in the PPI network or in the selected module 1. In addition, the DEG lysine demethylase 2B (KDM2B) was identified as a TF that can regulate genes in the significant modules 2 and 3. In conclusion, the present study has identified AGT, CXCL12 and KDM2B as potentially essential genes associated with the pathogenesis of knee OA.
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Affiliation(s)
- Meng Li
- Department of Orthopedics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Liqiang Zhi
- Department of Orthopedics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Zhi Zhang
- Department of Orthopedics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Weiguo Bian
- Department of Orthopedics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Yusheng Qiu
- Department of Orthopedics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
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53
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Dudakovic A, van Wijnen AJ. Epigenetic Control of Osteoblast Differentiation by Enhancer of Zeste Homolog 2 (EZH2). ACTA ACUST UNITED AC 2017. [DOI: 10.1007/s40610-017-0064-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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54
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Xu D, Gao Y, Hu N, Wu L, Chen Q. miR-365 Ameliorates Dexamethasone-Induced Suppression of Osteogenesis in MC3T3-E1 Cells by Targeting HDAC4. Int J Mol Sci 2017; 18:ijms18050977. [PMID: 28471397 PMCID: PMC5454890 DOI: 10.3390/ijms18050977] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 04/27/2017] [Accepted: 04/28/2017] [Indexed: 12/25/2022] Open
Abstract
Glucocorticoid administration is the leading cause of secondary osteoporosis. In this study, we tested the hypotheses that histone deacetylase 4 (HDAC4) is associated with glucocorticoid-induced bone loss and that HDAC4 dependent bone loss can be ameliorated by miRNA-365. Our previous studies showed that miR-365 mediates mechanical stimulation of chondrocyte proliferation and differentiation by targeting HDAC4. However, it is not clear whether miR-365 has an effect on glucocorticoid-induced osteoporosis. We have shown that, in MC3T3-E1 osteoblasts, dexamethasone (DEX) treatment decreased the expression of miR-365, which is accompanied by the decrease of cell viability in a dose-dependent manner. Transfection of miR-365 ameliorated DEX-induced inhibition of MC3T3-E1 cell viability and alkaline phosphatase activity, and attenuated the suppressive effect of DEX on runt-related transcription factor 2 (Runx2), osteopontin (OPN), and collagen 1a1 (Col1a1) osteogenic gene expression. In addition, miR-365 decreased the expression of HDAC4 mRNA and protein by direct targeting the 3′-untranslated regions (3′-UTR) of HDAC4 mRNA in osteoblasts. MiR-365 increased Runx2 expression and such stimulatory effect could be reversed by HDAC4 over-expression in osteoblasts. Collectively, our findings indicate that miR-365 ameliorates DEX-induced suppression of cell viability and osteogenesis by regulating the expression of HDAC4 in osteoblasts, suggesting miR-365 might be a novel therapeutic agent for treatment of glucocorticoid-induced osteoporosis.
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Affiliation(s)
- Daohua Xu
- Department of Pharmacology, Guangdong Medical University, Dongguan 523808, China.
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA.
| | - Yun Gao
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA.
| | - Nan Hu
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA.
- Department of Rheumatology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China.
| | - Longhuo Wu
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA.
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China.
| | - Qian Chen
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA.
- Bone and Joint Research Center, the First Affiliated Hospital and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710061, China.
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Farzaneh K, Thaler R, Paradise CR, Deyle DR, Julio MKD, Galindo M, Gordon JA, Stein GS, Dudakovic A, van Wijnen AJ. Histone H4 Methyltransferase Suv420h2 Maintains Fidelity of Osteoblast Differentiation. J Cell Biochem 2017; 118:1262-1272. [PMID: 27862226 PMCID: PMC5357582 DOI: 10.1002/jcb.25787] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 11/07/2016] [Indexed: 12/13/2022]
Abstract
Osteogenic lineage commitment and progression is controlled by multiple signaling pathways (e.g., WNT, BMP, FGF) that converge on bone-related transcription factors. Access of osteogenic transcription factors to chromatin is controlled by epigenetic regulators that generate post-translational modifications of histones ("histone code"), as well as read, edit and/or erase these modifications. Our understanding of the biological role of epigenetic regulators in osteoblast differentiation remains limited. Therefore, we performed next-generation RNA sequencing (RNA-seq) and established which chromatin-related proteins are robustly expressed in mouse bone tissues (e.g., fracture callus, calvarial bone). These studies also revealed that cells with increased osteogenic potential have higher levels of the H4K20 methyl transferase Suv420h2 compared to other methyl transferases (e.g., Suv39h1, Suv39h2, Suv420h1, Ezh1, Ezh2). We find that all six epigenetic regulators are transiently expressed at different stages of osteoblast differentiation in culture, with maximal mRNAs levels of Suv39h1 and Suv39h2 (at day 3) preceding maximal expression of Suv420h1 and Suv420h2 (at day 7) and developmental stages that reflect, respectively, early and later collagen matrix deposition. Loss of function analysis of Suv420h2 by siRNA depletion shows loss of H4K20 methylation and decreased expression of bone biomarkers (e.g., alkaline phosphatase/Alpl) and osteogenic transcription factors (e.g., Sp7/Osterix). Furthermore, Suv420h2 is required for matrix mineralization during osteoblast differentiation. We conclude that Suv420h2 controls the H4K20 methylome of osteoblasts and is critical for normal progression of osteoblastogenesis. J. Cell. Biochem. 118: 1262-1272, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Khani Farzaneh
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Roman Thaler
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | | | | | | | - Mario Galindo
- Millennium Institute on Immunology and Immunotherapy, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Jonathan A. Gordon
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, Vermont 05405
| | - Gary S. Stein
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, Vermont 05405
| | - Amel Dudakovic
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Andre J. van Wijnen
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
- Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
- Corresponding author: Andre J. van Wijnen, Ph.D., Mayo Clinic, 200 First Street SW, Rochester, MN 55905, Phone: 507- 293-2105, Fax: 507-284-5075,
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56
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Dudakovic A, Gluscevic M, Paradise CR, Dudakovic H, Khani F, Thaler R, Ahmed FS, Li X, Dietz AB, Stein GS, Montecino MA, Deyle DR, Westendorf JJ, van Wijnen AJ. Profiling of human epigenetic regulators using a semi-automated real-time qPCR platform validated by next generation sequencing. Gene 2017; 609:28-37. [PMID: 28132772 DOI: 10.1016/j.gene.2017.01.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 01/20/2017] [Indexed: 12/11/2022]
Abstract
Epigenetic mechanisms control phenotypic commitment of mesenchymal stromal/stem cells (MSCs) into osteogenic, chondrogenic or adipogenic lineages. To investigate enzymes and chromatin binding proteins controlling the epigenome, we developed a hybrid expression screening strategy that combines semi-automated real-time qPCR (RT-qPCR), next generation RNA sequencing (RNA-seq), and a novel data management application (FileMerge). This strategy was used to interrogate expression of a large cohort (n>300) of human epigenetic regulators (EpiRegs) that generate, interpret and/or edit the histone code. We find that EpiRegs with similar enzymatic functions are variably expressed and specific isoforms dominate over others in human MSCs. This principle is exemplified by analysis of key histone acetyl transferases (HATs) and deacetylases (HDACs), H3 lysine methyltransferases (e.g., EHMTs) and demethylases (KDMs), as well as bromodomain (BRDs) and chromobox (CBX) proteins. Our results show gender-specific expression of H3 lysine 9 [H3K9] demethylases (e.g., KDM5D and UTY) as expected and upregulation of distinct EpiRegs (n>30) during osteogenic differentiation of MSCs (e.g., HDAC5 and HDAC7). The functional significance of HDACs in osteogenic lineage commitment of MSCs was functionally validated using panobinostat (LBH-589). This pan-deacetylase inhibitor suppresses osteoblastic differentiation as evidenced by reductions in bone-specific mRNA markers (e.g., ALPL), alkaline phosphatase activity and calcium deposition (i.e., Alizarin Red staining). Thus, our RT-qPCR platform identifies candidate EpiRegs by expression screening, predicts biological outcomes of their corresponding inhibitors, and enables manipulation of the human epigenome using molecular or pharmacological approaches to control stem cell differentiation.
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Affiliation(s)
- Amel Dudakovic
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | | | | | | | - Farzaneh Khani
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Roman Thaler
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Farah S Ahmed
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Xiaodong Li
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
| | - Allan B Dietz
- Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Gary S Stein
- Department of Biochemistry, University of Vermont Medical School, Burlington, VT, USA
| | - Martin A Montecino
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, Chile
| | | | - Jennifer J Westendorf
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA; Biochemistry & Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Andre J van Wijnen
- Departments of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA; Biochemistry & Molecular Biology, Mayo Clinic, Rochester, MN, USA; Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, USA.
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57
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Wu H, Gordon JAR, Whitfield TW, Tai PWL, van Wijnen AJ, Stein JL, Stein GS, Lian JB. Chromatin dynamics regulate mesenchymal stem cell lineage specification and differentiation to osteogenesis. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2017; 1860:438-449. [PMID: 28077316 DOI: 10.1016/j.bbagrm.2017.01.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 12/10/2016] [Accepted: 01/06/2017] [Indexed: 01/08/2023]
Abstract
Multipotent mesenchymal stromal cells (MSCs) are critical for regeneration of multiple tissues. Epigenetic mechanisms are fundamental regulators of lineage specification and cell fate, and as such, we addressed the question of which epigenetic modifications characterize the transition of nascent MSCs to a tissue specific MSC-derived phenotype. By profiling the temporal changes of seven histone marks correlated to gene expression during proliferation, early commitment, matrix deposition, and mineralization stages, we identified distinct epigenetic mechanisms that regulate transcriptional programs necessary for tissue-specific phenotype development. Patterns of stage-specific enrichment of histone modifications revealed distinct modes of repression and activation of gene expression that would not be detected using single endpoint analysis. We discovered that at commitment, H3K27me3 is removed from genes that are upregulated and is not acquired on downregulated genes. Additionally, we found that the absence of H3K4me3 modification at promoters defined a subset of osteoblast-specific upregulated genes, indicating that acquisition of acetyl modifications drive activation of these genes. Significantly, loss or gain of H3K36me3 was the primary predictor of dynamic changes in temporal gene expression. Using unsupervised pattern discovery analysis the signature of osteogenic-related histone modifications identified novel functional cis regulatory modules associated with enhancer regions that control tissue-specific genes. Our work provides a cornerstone to understand the epigenetic regulation of transcriptional programs that are important for MSC lineage commitment and lineage, as well as insights to facilitate MSC-based therapeutic interventions.
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Affiliation(s)
- Hai Wu
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
| | - Jonathan A R Gordon
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
| | - Troy W Whitfield
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA, United States.
| | - Phillip W L Tai
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
| | - Andre J van Wijnen
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, United States.
| | - Janet L Stein
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
| | - Gary S Stein
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
| | - Jane B Lian
- Department of Biochemistry and Vermont Cancer Center, University of Vermont, Burlington, VT, United States.
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58
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Dudakovic A, Camilleri ET, Riester SM, Paradise CR, Gluscevic M, O'Toole TM, Thaler R, Evans JM, Yan H, Subramaniam M, Hawse JR, Stein GS, Montecino MA, McGee-Lawrence ME, Westendorf JJ, van Wijnen AJ. Enhancer of Zeste Homolog 2 Inhibition Stimulates Bone Formation and Mitigates Bone Loss Caused by Ovariectomy in Skeletally Mature Mice. J Biol Chem 2016; 291:24594-24606. [PMID: 27758858 DOI: 10.1074/jbc.m116.740571] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 10/06/2016] [Indexed: 11/06/2022] Open
Abstract
Perturbations in skeletal development and bone degeneration may result in reduced bone mass and quality, leading to greater fracture risk. Bone loss is mitigated by bone protective therapies, but there is a clinical need for new bone-anabolic agents. Previous work has demonstrated that Ezh2 (enhancer of zeste homolog 2), a histone 3 lysine 27 (H3K27) methyltransferase, suppressed differentiation of osteogenic progenitors. Here, we investigated whether inhibition of Ezh2 can be leveraged for bone stimulatory applications. Pharmacologic inhibition and siRNA knockdown of Ezh2 enhanced osteogenic commitment of MC3T3 preosteoblasts. Next generation RNA sequencing of mRNAs and real time quantitative PCR profiling established that Ezh2 inactivation promotes expression of bone-related gene regulators and extracellular matrix proteins. Mechanistically, enhanced gene expression was linked to decreased H3K27 trimethylation (H3K27me3) near transcriptional start sites in genome-wide sequencing of chromatin immunoprecipitations assays. Administration of an Ezh2 inhibitor modestly increases bone density parameters of adult mice. Furthermore, Ezh2 inhibition also alleviated bone loss in an estrogen-deficient mammalian model for osteoporosis. Ezh2 inhibition enhanced expression of Wnt10b and Pth1r and increased the BMP-dependent phosphorylation of Smad1/5. Thus, these data suggest that inhibition of Ezh2 promotes paracrine signaling in osteoblasts and has bone-anabolic and osteoprotective potential in adults.
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Affiliation(s)
| | | | | | | | | | | | | | - Jared M Evans
- Statistics and Informatics, Mayo Clinic, Rochester, Minnesota 55905
| | - Huihuang Yan
- Statistics and Informatics, Mayo Clinic, Rochester, Minnesota 55905
| | | | | | - Gary S Stein
- the Department of Biochemistry, University of Vermont Medical School, Burlington, Vermont 05405
| | - Martin A Montecino
- the Centro de Investigaciones Biomedicas and FONDAP Center for Genome Regulation, Universidad Andres Bello, 837-0146 Santiago, Chile, and
| | - Meghan E McGee-Lawrence
- the Department of Cellular Biology and Anatomy, Georgia Regents University, Augusta, Georgia 30912
| | | | - Andre J van Wijnen
- From the Departments of Orthopedic Surgery,; Biochemistry & Molecular Biology,.
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59
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Carpio LR, Bradley EW, McGee-Lawrence ME, Weivoda MM, Poston DD, Dudakovic A, Xu M, Tchkonia T, Kirkland JL, van Wijnen AJ, Oursler MJ, Westendorf JJ. Histone deacetylase 3 supports endochondral bone formation by controlling cytokine signaling and matrix remodeling. Sci Signal 2016; 9:ra79. [PMID: 27507649 PMCID: PMC5409103 DOI: 10.1126/scisignal.aaf3273] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Histone deacetylase (HDAC) inhibitors are efficacious epigenetic-based therapies for some cancers and neurological disorders; however, each of these drugs inhibits multiple HDACs and has detrimental effects on the skeleton. To better understand how HDAC inhibitors affect endochondral bone formation, we conditionally deleted one of their targets, Hdac3, pre- and postnatally in type II collagen α1 (Col2α1)-expressing chondrocytes. Embryonic deletion was lethal, but postnatal deletion of Hdac3 delayed secondary ossification center formation, altered maturation of growth plate chondrocytes, and increased osteoclast activity in the primary spongiosa. HDAC3-deficient chondrocytes exhibited increased expression of cytokine and matrix-degrading genes (Il-6, Mmp3, Mmp13, and Saa3) and a reduced abundance of genes related to extracellular matrix production, bone development, and ossification (Acan, Col2a1, Ihh, and Col10a1). Histone acetylation increased at and near genes that had increased expression. The acetylation and activation of nuclear factor κB (NF-κB) were also increased in HDAC3-deficient chondrocytes. Increased cytokine signaling promoted autocrine activation of Janus kinase (JAK)-signal transducer and activator of transcription (STAT) and NF-κB pathways to suppress chondrocyte maturation, as well as paracrine activation of osteoclasts and bone resorption. Blockade of interleukin-6 (IL-6)-JAK-STAT signaling, NF-κB signaling, and bromodomain extraterminal proteins, which recognize acetylated lysines and promote transcriptional elongation, significantly reduced Il-6 and Mmp13 expression in HDAC3-deficient chondrocytes and secondary activation in osteoclasts. The JAK inhibitor ruxolitinib also reduced osteoclast activity in Hdac3 conditional knockout mice. Thus, HDAC3 controls the temporal and spatial expression of tissue-remodeling genes and inflammatory responses in chondrocytes to ensure proper endochondral ossification during development.
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Affiliation(s)
- Lomeli R Carpio
- Mayo Graduate School, Mayo Clinic, Rochester, MN 55905, USA. Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | | | - Meghan E McGee-Lawrence
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA. Institute of Regenerative and Reparative Medicine, Augusta University, Augusta, GA 30912, USA
| | - Megan M Weivoda
- Division of Endocrinology, Diabetes, Metabolism and Nutrition, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - Daniel D Poston
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA. Creighton University, Omaha, NE 68102, USA
| | - Amel Dudakovic
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
| | - Ming Xu
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN 55905, USA
| | - Tamar Tchkonia
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN 55905, USA
| | - James L Kirkland
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN 55905, USA
| | - Andre J van Wijnen
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
| | - Merry Jo Oursler
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA. Division of Endocrinology, Diabetes, Metabolism and Nutrition, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - Jennifer J Westendorf
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA.
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60
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Fang C, Qiao Y, Mun SH, Lee MJ, Murata K, Bae S, Zhao B, Park-Min KH, Ivashkiv LB. Cutting Edge: EZH2 Promotes Osteoclastogenesis by Epigenetic Silencing of the Negative Regulator IRF8. THE JOURNAL OF IMMUNOLOGY 2016; 196:4452-4456. [PMID: 27183582 DOI: 10.4049/jimmunol.1501466] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 04/04/2016] [Indexed: 11/19/2022]
Abstract
Osteoclasts are resorptive cells that are important for homeostatic bone remodeling and pathological bone resorption. Emerging evidence suggests an important role for epigenetic mechanisms in osteoclastogenesis. A recent study showed that epigenetic silencing of the negative regulator of osteoclastogenesis Irf8 by DNA methylation is required for osteoclast differentiation. In this study, we investigated the role of EZH2, which epigenetically silences gene expression by histone methylation, in osteoclastogenesis. Inhibition of EZH2 by the small molecule GSK126, or decreasing its expression using antisense oligonucleotides, impeded osteoclast differentiation. Mechanistically, EZH2 was recruited to the IRF8 promoter after RANKL stimulation to deposit the negative histone mark H3K27me3 and downregulate IRF8 expression. GSK126 attenuated bone loss in the ovariectomy mouse model of postmenopausal osteoporosis. Our findings provide evidence for an additional mechanism of epigenetic IRF8 silencing during osteoclastogenesis that likely works cooperatively with DNA methylation, further emphasizing the importance of IRF8 as a negative regulator of osteoclastogenesis.
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Affiliation(s)
- Celestia Fang
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Yu Qiao
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Se Hwan Mun
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Min Joon Lee
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Koichi Murata
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Seyeon Bae
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery
| | - Baohong Zhao
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery.,Department of Medicine Weill Cornell Medical College
| | - Kyung-Hyun Park-Min
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery.,Department of Medicine Weill Cornell Medical College
| | - Lionel B Ivashkiv
- Arthritis and Tissue Degeneration Program David Z. Rosensweig Genomics Research Center Hospital for Special Surgery.,Department of Medicine Weill Cornell Medical College.,Graduate Program in Immunology and Microbial Pathogenesis Weill Cornell Graduate School of Medical Sciences
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61
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Hossan T, Nagarajan S, Baumgart SJ, Xie W, Magallanes RT, Hernandez C, Chiaroni PM, Indenbirken D, Spitzner M, Thomas-Chollier M, Grade M, Thieffry D, Grundhoff A, Wegwitz F, Johnsen SA. Histone Chaperone SSRP1 is Essential for Wnt Signaling Pathway Activity During Osteoblast Differentiation. Stem Cells 2016; 34:1369-76. [PMID: 27146025 DOI: 10.1002/stem.2287] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 11/12/2015] [Indexed: 12/21/2022]
Abstract
Cellular differentiation is accompanied by dramatic changes in chromatin structure which direct the activation of lineage-specific transcriptional programs. Structure-specific recognition protein-1 (SSRP1) is a histone chaperone which is important for chromatin-associated processes such as transcription, DNA replication and repair. Since the function of SSRP1 during cell differentiation remains unclear, we investigated its potential role in controlling lineage determination. Depletion of SSRP1 in human mesenchymal stem cells elicited lineage-specific effects by increasing expression of adipocyte-specific genes and decreasing the expression of osteoblast-specific genes. Consistent with a role in controlling lineage specification, transcriptome-wide RNA-sequencing following SSRP1 depletion and the induction of osteoblast differentiation revealed a specific decrease in the expression of genes involved in biological processes related to osteoblast differentiation. Importantly, we observed a specific downregulation of target genes of the canonical Wnt signaling pathway, which was accompanied by decreased nuclear localization of active β-catenin. Together our data uncover a previously unknown role for SSRP1 in promoting the activation of the Wnt signaling pathway activity during cellular differentiation. Stem Cells 2016;34:1369-1376.
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Affiliation(s)
- Tareq Hossan
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Sankari Nagarajan
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Simon J Baumgart
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Wanhua Xie
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Roberto Tirado Magallanes
- Computational Systems Biology Team, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, Inserm, Ecole Normale Supérieure, PSL Research University, Paris, France
| | - Céline Hernandez
- Computational Systems Biology Team, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, Inserm, Ecole Normale Supérieure, PSL Research University, Paris, France
| | - Pierre-Marie Chiaroni
- Computational Systems Biology Team, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, Inserm, Ecole Normale Supérieure, PSL Research University, Paris, France
| | - Daniela Indenbirken
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Melanie Spitzner
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Morgane Thomas-Chollier
- Computational Systems Biology Team, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, Inserm, Ecole Normale Supérieure, PSL Research University, Paris, France
| | - Marian Grade
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Denis Thieffry
- Computational Systems Biology Team, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS, Inserm, Ecole Normale Supérieure, PSL Research University, Paris, France
| | - Adam Grundhoff
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Florian Wegwitz
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
| | - Steven A Johnsen
- Department of General, Visceral and Pediatric Surgery, Göttingen Center for Molecular Biosciences (GZMB), University Medical Center Göttingen, Göttingen, Germany
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Ricarte F, Nakatani T, Partridge N. PTH Signaling and Epigenetic Control of Bone Remodeling. ACTA ACUST UNITED AC 2016; 2:55-61. [PMID: 27152252 DOI: 10.1007/s40610-016-0033-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
As our understanding of the mechanisms that govern bone development advance, the role of epigenetic modifications in these processes become increasingly evident. Interestingly, in parathyroid hormone (PTH)-induced bone metabolism and remodeling, recent evidence shows that PTH signaling employs a particular facet of the epigenetic machinery to elicit its desired effects. In this review, we briefly discuss the known epigenetic events occurring in cells of the osteoblast lineage. More specifically, we elaborate on current findings that reveal the utilization of histone deacetylating enzymes (HDACs) in PTH-regulated modulation of gene expression in bone.
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Affiliation(s)
- Florante Ricarte
- New York University School of Medicine, Sackler Institute of Graduate Biomedical Sciences, Department of Biochemistry and Molecular Pharmacology, New York, NY 10016
| | - Teruyo Nakatani
- New York University College of Dentistry, Department of Basic Science and Craniofacial Biology, New York, NY 10010
| | - Nicola Partridge
- New York University School of Medicine, Sackler Institute of Graduate Biomedical Sciences, Department of Biochemistry and Molecular Pharmacology, New York, NY 10016; New York University College of Dentistry, Department of Basic Science and Craniofacial Biology, New York, NY 10010
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63
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Thaler R, Maurizi A, Roschger P, Sturmlechner I, Khani F, Spitzer S, Rumpler M, Zwerina J, Karlic H, Dudakovic A, Klaushofer K, Teti A, Rucci N, Varga F, van Wijnen AJ. Anabolic and Antiresorptive Modulation of Bone Homeostasis by the Epigenetic Modulator Sulforaphane, a Naturally Occurring Isothiocyanate. J Biol Chem 2016; 291:6754-71. [PMID: 26757819 DOI: 10.1074/jbc.m115.678235] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Indexed: 11/06/2022] Open
Abstract
Bone degenerative pathologies like osteoporosis may be initiated by age-related shifts in anabolic and catabolic responses that control bone homeostasis. Here we show that sulforaphane (SFN), a naturally occurring isothiocyanate, promotes osteoblast differentiation by epigenetic mechanisms. SFN enhances active DNA demethylation viaTet1andTet2and promotes preosteoblast differentiation by enhancing extracellular matrix mineralization and the expression of osteoblastic markers (Runx2,Col1a1,Bglap2,Sp7,Atf4, andAlpl). SFN decreases the expression of the osteoclast activator receptor activator of nuclear factor-κB ligand (RANKL) in osteocytes and mouse calvarial explants and preferentially induces apoptosis in preosteoclastic cells via up-regulation of theTet1/Fas/Caspase 8 and Caspase 3/7 pathway. These mechanistic effects correlate with higher bone volume (∼20%) in both normal and ovariectomized mice treated with SFN for 5 weeks compared with untreated mice as determined by microcomputed tomography. This effect is due to a higher trabecular number in these mice. Importantly, no shifts in mineral density distribution are observed upon SFN treatment as measured by quantitative backscattered electron imaging. Our data indicate that the food-derived compound SFN epigenetically stimulates osteoblast activity and diminishes osteoclast bone resorption, shifting the balance of bone homeostasis and favoring bone acquisition and/or mitigation of bone resorptionin vivo Thus, SFN is a member of a new class of epigenetic compounds that could be considered for novel strategies to counteract osteoporosis.
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Affiliation(s)
- Roman Thaler
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria, Department of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, and
| | - Antonio Maurizi
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy
| | - Paul Roschger
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Ines Sturmlechner
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Farzaneh Khani
- Department of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, and
| | - Silvia Spitzer
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Monika Rumpler
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Jochen Zwerina
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Heidrun Karlic
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Amel Dudakovic
- Department of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, and
| | - Klaus Klaushofer
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria
| | - Anna Teti
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy
| | - Nadia Rucci
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy
| | - Franz Varga
- From the Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risks (AUVA) Trauma Center Meidling, First Medical Department, Hanusch Hospital, 1140 Vienna, Austria,
| | - Andre J van Wijnen
- Department of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, and
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Abstract
Epigenetic control of the genome involves a complex series of unique, physiologically responsive and integrated pathways, each with distinct mechanisms. Insight into epigenetic regulation has transformed understanding of inheritance, development and a broad spectrum of biological processes as well as advances in mechanistic and clinical characterization of tissues and disease states. The dynamics of bone tissue undergoing continuous remodeling during growth and turnover in the adult skeleton, involves epigenetic mechanisms that have emerged as an important component to maintaining skeletal homeostasis. A series of four reviews are presented in the journal BONE covering different aspects of epigenetic control mechanisms that have impacted on the skeleton. Authorship on each of the reviews is shared by investigators from different institutions to present a consensus of emerging concepts and future directions for understanding regulation of the bone epigenome and skeletal pathologies.
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Affiliation(s)
- Jane B Lian
- Department of Biochemistry, University of Vermont College of Medicine and Cancer Center, 89 Beaumont Ave, Burlington, VT 05405, USA.
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