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Urbanski AH, Maso VE, Martins FM, da Costa-Martins AG, do Nascimento Oliveira APB, Nakaya HI. Chikungunya-Driven Gene Expression Linked to Osteoclast Survival and Chronic Arthralgia. Infect Dis Rep 2024; 16:914-922. [PMID: 39311214 PMCID: PMC11417755 DOI: 10.3390/idr16050073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2024] [Revised: 09/10/2024] [Accepted: 09/11/2024] [Indexed: 09/26/2024] Open
Abstract
Chikungunya fever (CHIKF), caused by the Chikungunya virus (CHIKV), manifests as acute febrile illness often associated with polyarthritis and polyarthralgia. Although the acute symptoms resolve within two weeks, many patients experience prolonged joint pain and inflammation, resembling rheumatoid arthritis (RA). This study aimed to identify molecular markers related to joint pain and chronicity in CHIKV-infected individuals by analyzing blood transcriptomes using bulk RNA sequencing. B- and T-cell receptor (BCR and TCR) diversity was assessed through computational analysis of RNA-seq data, revealing a significant reduction in CDR3 diversity in CHIKV-infected individuals compared to healthy controls. This reduced diversity was associated with the upregulation of genes involved in osteoclast differentiation and activation, particularly through the RANK/RANKL signaling pathway. These findings suggest a potential link between immune dysregulation and enhanced osteoclast activity, which may contribute to the persistence of joint pain in chronic CHIKF. Targeting osteoclast-related pathways could offer therapeutic strategies for managing chronic symptoms in CHIKF patients.
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Affiliation(s)
- Alysson Henrique Urbanski
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo 05508-020, Brazil (V.E.M.); (F.M.M.); (A.G.d.C.-M.); (A.P.B.d.N.O.)
| | - Vanessa E. Maso
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo 05508-020, Brazil (V.E.M.); (F.M.M.); (A.G.d.C.-M.); (A.P.B.d.N.O.)
| | - Felipe M. Martins
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo 05508-020, Brazil (V.E.M.); (F.M.M.); (A.G.d.C.-M.); (A.P.B.d.N.O.)
| | - André Guilherme da Costa-Martins
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo 05508-020, Brazil (V.E.M.); (F.M.M.); (A.G.d.C.-M.); (A.P.B.d.N.O.)
- Micromanufacturing Laboratory, Institute for Technological Research—IPT, São Paulo 05508-901, Brazil
| | | | - Helder I. Nakaya
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo 05508-020, Brazil (V.E.M.); (F.M.M.); (A.G.d.C.-M.); (A.P.B.d.N.O.)
- Hospital Israelita Albert Einstein, São Paulo 05653-000, Brazil
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Zhu S, Chen W, Masson A, Li YP. Cell signaling and transcriptional regulation of osteoblast lineage commitment, differentiation, bone formation, and homeostasis. Cell Discov 2024; 10:71. [PMID: 38956429 PMCID: PMC11219878 DOI: 10.1038/s41421-024-00689-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 05/04/2024] [Indexed: 07/04/2024] Open
Abstract
The initiation of osteogenesis primarily occurs as mesenchymal stem cells undergo differentiation into osteoblasts. This differentiation process plays a crucial role in bone formation and homeostasis and is regulated by two intricate processes: cell signal transduction and transcriptional gene expression. Various essential cell signaling pathways, including Wnt, BMP, TGF-β, Hedgehog, PTH, FGF, Ephrin, Notch, Hippo, and Piezo1/2, play a critical role in facilitating osteoblast differentiation, bone formation, and bone homeostasis. Key transcriptional factors in this differentiation process include Runx2, Cbfβ, Runx1, Osterix, ATF4, SATB2, and TAZ/YAP. Furthermore, a diverse array of epigenetic factors also plays critical roles in osteoblast differentiation, bone formation, and homeostasis at the transcriptional level. This review provides an overview of the latest developments and current comprehension concerning the pathways of cell signaling, regulation of hormones, and transcriptional regulation of genes involved in the commitment and differentiation of osteoblast lineage, as well as in bone formation and maintenance of homeostasis. The paper also reviews epigenetic regulation of osteoblast differentiation via mechanisms, such as histone and DNA modifications. Additionally, we summarize the latest developments in osteoblast biology spurred by recent advancements in various modern technologies and bioinformatics. By synthesizing these insights into a comprehensive understanding of osteoblast differentiation, this review provides further clarification of the mechanisms underlying osteoblast lineage commitment, differentiation, and bone formation, and highlights potential new therapeutic applications for the treatment of bone diseases.
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Affiliation(s)
- Siyu Zhu
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA
| | - Wei Chen
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA.
| | - Alasdair Masson
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA
| | - Yi-Ping Li
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA.
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Li S, Liu G, Hu S. Osteoporosis: interferon-gamma-mediated bone remodeling in osteoimmunology. Front Immunol 2024; 15:1396122. [PMID: 38817601 PMCID: PMC11137183 DOI: 10.3389/fimmu.2024.1396122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/26/2024] [Indexed: 06/01/2024] Open
Abstract
As the world population ages, osteoporosis, the most common disease of bone metabolism, affects more than 200 million people worldwide. The etiology is an imbalance in bone remodeling process resulting in more significant bone resorption than bone remodeling. With the advent of the osteoimmunology field, the immune system's role in skeletal pathologies is gradually being discovered. The cytokine interferon-gamma (IFN-γ), a member of the interferon family, is an important factor in the etiology and treatment of osteoporosis because it mediates bone remodeling. This review starts with bone remodeling process and includes the cellular and key signaling pathways of bone remodeling. The effects of IFN-γ on osteoblasts, osteoclasts, and bone mass are discussed separately, while the overall effects of IFN-γ on primary and secondary osteoporosis are summarized. The net effect of IFN-γ on bone appears to be highly dependent on the environment, dose, concentration, and stage of cellular differentiation. This review focuses on the mechanisms of bone remodeling and bone immunology, with a comprehensive discussion of the relationship between IFN-γ and osteoporosis. Finding the paradoxical balance of IFN-γ in bone immunology and exploring the potential of its clinical application provide new ideas for the clinical treatment of osteoporosis and drug development.
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Affiliation(s)
- Siying Li
- The Orthopaedic Center, The First People’s Hospital of Wenling, Taizhou University Affiliated Wenling Hospital, Wenling, Zhejiang, China
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, China
| | - Gang Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, China
| | - Siwang Hu
- The Orthopaedic Center, The First People’s Hospital of Wenling, Taizhou University Affiliated Wenling Hospital, Wenling, Zhejiang, China
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Clark R, Park SY, Bradley EW, Mansky K, Tasca A. Mouse mandibular-derived osteoclast progenitors have differences in intrinsic properties compared with femoral-derived progenitors. JBMR Plus 2024; 8:ziae029. [PMID: 38606149 PMCID: PMC11008737 DOI: 10.1093/jbmrpl/ziae029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 02/23/2024] [Accepted: 02/29/2024] [Indexed: 04/13/2024] Open
Abstract
Craniofacial osteoclasts are essential for site-specific processes such as alveolar bone resorption, tooth eruption, and orthodontic tooth movement. Much of the current understanding of osteoclast development and function comes from studies using long bone-derived cells. Minimal investigation has been done to explore skeletal site differences. The overall goal of this study was to determine if mandibular- and femoral-derived osteoclasts represent distinct populations. To test this hypothesis, bone marrow cells were initially analyzed from the mandible and femur of 2-month-old mice. It was shown that mandibular-derived osteoclasts have enhanced size (mm2) compared with femoral-derived osteoclasts. Since bone marrow macrophages are a heterogenous population, we additionally selected for monocytes and demonstrated that mandibular-derived monocytes also form osteoclasts with increased size compared with femoral-derived monocytes. Osteoclast precursor populations from both skeletal sites were analyzed by flow cytometry. A newly described Ly6CHigh+ population as well as the Ly6Cint population was increased in the mandibular-derived cells. The difference in differentiation potential between monocyte cultures suggests that the increase in the Ly6CHigh+ population may explain the enhanced differentiation potential in mandibular-derived cells. Monocyte genes such as Pu.1, C/ebp-a, and Prdm1 are increased in expression in mandibular-derived monocytes compared with femoral-derived monocytes. As expected with enhanced differentiation, osteoclast genes including Nfatc1, Dc-stamp, Ctsk, and Rank are upregulated in mandibular-derived osteoclast precursors. Future studies will determine how changes in the environment of the mandible lead to changes in percentages of osteoclast progenitors and their differentiation potential.
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Affiliation(s)
- Rachel Clark
- Department of Developmental and Surgical Sciences, Oral Biology Graduate Program, University of Minnesota School of Dentistry, Minneapolis, MN 55455, United States
| | - Soo Y Park
- School of Dentistry, University of Minnesota, Minneapolis, MN 55455, United States
| | - Elizabeth W Bradley
- Department of Orthopedic Surgery, University of Minnesota, Minneapolis, MN 55455, United States
| | - Kim Mansky
- Division of Orthodontics, Department of Developmental and Surgical Sciences, University of Minnesota School of Dentistry Minneapolis, Minneapolis, MN 55455, United States
| | - Amy Tasca
- Division of Orthodontics, Department of Developmental and Surgical Sciences, University of Minnesota School of Dentistry Minneapolis, Minneapolis, MN 55455, United States
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Jiang T, Xia T, Qiao F, Wang N, Jiang Y, Xin H. Role and Regulation of Transcription Factors in Osteoclastogenesis. Int J Mol Sci 2023; 24:16175. [PMID: 38003376 PMCID: PMC10671247 DOI: 10.3390/ijms242216175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 11/01/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
Bones serve mechanical and defensive functions, as well as regulating the balance of calcium ions and housing bone marrow.. The qualities of bones do not remain constant. Instead, they fluctuate throughout life, with functions increasing in some situations while deteriorating in others. The synchronization of osteoblast-mediated bone formation and osteoclast-mediated bone resorption is critical for maintaining bone mass and microstructure integrity in a steady state. This equilibrium, however, can be disrupted by a variety of bone pathologies. Excessive osteoclast differentiation can result in osteoporosis, Paget's disease, osteolytic bone metastases, and rheumatoid arthritis, all of which can adversely affect people's health. Osteoclast differentiation is regulated by transcription factors NFATc1, MITF, C/EBPα, PU.1, NF-κB, and c-Fos. The transcriptional activity of osteoclasts is largely influenced by developmental and environmental signals with the involvement of co-factors, RNAs, epigenetics, systemic factors, and the microenvironment. In this paper, we review these themes in regard to transcriptional regulation in osteoclastogenesis.
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Affiliation(s)
- Tao Jiang
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
- School of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Tianshuang Xia
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Fangliang Qiao
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Nani Wang
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine, Hangzhou 310007, China;
| | - Yiping Jiang
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Hailiang Xin
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
- School of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
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Wang J, McVicar A, Chen Y, Deng HW, Zhao Z, Chen W, Li YP. Atp6i deficient mouse model uncovers transforming growth factor-β1 /Smad2/3 as a key signaling pathway regulating odontoblast differentiation and tooth root formation. Int J Oral Sci 2023; 15:35. [PMID: 37599332 PMCID: PMC10440342 DOI: 10.1038/s41368-023-00235-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 06/01/2023] [Accepted: 07/03/2023] [Indexed: 08/22/2023] Open
Abstract
The biomolecular mechanisms that regulate tooth root development and odontoblast differentiation are poorly understood. We found that Atp6i deficient mice (Atp6i-/-) arrested tooth root formation, indicated by truncated Hertwig's epithelial root sheath (HERS) progression. Furthermore, Atp6i deficiency significantly reduced the proliferation and differentiation of radicular odontogenic cells responsible for root formation. Atp6i-/- mice had largely decreased expression of odontoblast differentiation marker gene expression profiles (Col1a1, Nfic, Dspp, and Osx) in the alveolar bone. Atp6i-/- mice sample RNA-seq analysis results showed decreased expression levels of odontoblast markers. Additionally, there was a significant reduction in Smad2/3 activation, inhibiting transforming growth factor-β (TGF-β) signaling in Atp6i-/- odontoblasts. Through treating pulp precursor cells with Atp6i-/- or wild-type OC bone resorption-conditioned medium, we found the latter medium to promote odontoblast differentiation, as shown by increased odontoblast differentiation marker genes expression (Nfic, Dspp, Osx, and Runx2). This increased expression was significantly blocked by anti-TGF-β1 antibody neutralization, whereas odontoblast differentiation and Smad2/3 activation were significantly attenuated by Atp6i-/- OC conditioned medium. Importantly, ectopic TGF-β1 partially rescued root development and root dentin deposition of Atp6i-/- mice tooth germs were transplanted under mouse kidney capsules. Collectively, our novel data shows that the prevention of TGF-β1 release from the alveolar bone matrix due to OC dysfunction may lead to osteopetrosis-associated root formation via impaired radicular odontoblast differentiation. As such, this study uncovers TGF-β1 /Smad2/3 as a key signaling pathway regulating odontoblast differentiation and tooth root formation and may contribute to future therapeutic approaches to tooth root regeneration.
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Affiliation(s)
- Jue Wang
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Abigail McVicar
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA
| | - Yilin Chen
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA
| | - Hong-Wen Deng
- Tulane Center of Biomedical Informatics and Genomics, Deming Department of Medicine, Tulane University School of Medicine, New Orleans, LA, USA
| | - Zhihe Zhao
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wei Chen
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA.
| | - Yi-Ping Li
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, USA.
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7
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Omori K, Otani S, Date Y, Ueno T, Ito T, Umeda M, Ito K. C/ebpα represses the oncogenic Runx3-Myc axis in p53-deficient osteosarcoma development. Oncogene 2023; 42:2485-2494. [PMID: 37402881 DOI: 10.1038/s41388-023-02761-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 06/14/2023] [Accepted: 06/22/2023] [Indexed: 07/06/2023]
Abstract
Osteosarcoma (OS) is characterized by TP53 mutations in humans. In mice, loss of p53 triggers OS development, and osteoprogenitor-specific p53-deleted mice are widely used to study the process of osteosarcomagenesis. However, the molecular mechanisms underlying the initiation or progression of OS following or parallel to p53 inactivation remain largely unknown. Here, we examined the role of transcription factors involved in adipogenesis (adipo-TFs) in p53-deficient OS and identified a novel tumor suppressive molecular mechanism mediated by C/ebpα. C/ebpα specifically interacts with Runx3, a p53 deficiency-dependent oncogene, and, in the same manner as p53, decreases the activity of the oncogenic axis of OS, Runx3-Myc, by inhibiting Runx3 DNA binding. The identification of a novel molecular role for C/ebpα in p53-deficient osteosarcomagenesis underscores the importance of the Runx-Myc oncogenic axis as a therapeutic target for OS.
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Affiliation(s)
- Keisuke Omori
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
- Department of Clinical Oral Oncology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Shohei Otani
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Yuki Date
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Tomoya Ueno
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Tomoko Ito
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Masahiro Umeda
- Department of Clinical Oral Oncology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Kosei Ito
- Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan.
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Kim HJ, Lee DK, Choi JY. Functional Role of Phospholipase D in Bone Metabolism. J Bone Metab 2023; 30:117-125. [PMID: 37449345 PMCID: PMC10346002 DOI: 10.11005/jbm.2023.30.2.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/14/2023] [Accepted: 05/27/2023] [Indexed: 07/18/2023] Open
Abstract
Phospholipase D (PLD) proteins are major enzymes that regulate various cellular functions, such as cell growth, cell migration, membrane trafficking, and cytoskeletal dynamics. As they are responsible for such important biological functions, PLD proteins have been considered promising therapeutic targets for various diseases, including cancer and vascular and neurological diseases. Intriguingly, emerging evidence indicates that PLD1 and PLD2, 2 major mammalian PLD isoenzymes, are the key regulators of bone remodeling; this suggests that these isozymes could be used as potential therapeutic targets for bone diseases, such as osteoporosis and rheumatoid arthritis. PLD1 or PLD2 deficiency in mice can lead to decreased bone mass and dysregulated bone homeostasis. Although both mutant mice exhibit similar skeletal phenotypes, PLD1 and PLD2 play distinct and nonredundant roles in bone cell function. This review summarizes the physiological roles of PLD1 and PLD2 in bone metabolism, focusing on recent findings of the biological functions and action mechanisms of PLD1 and PLD2 in bone cells.
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Ma XX, Meng XQ, Wang YL, Liu Y, Shi XR, Shao S, Duan SZ, Lu HX. Ncor1 Deficiency Promotes Osteoclastogenesis and Exacerbates Periodontitis. J Dent Res 2023; 102:72-81. [PMID: 35983582 DOI: 10.1177/00220345221116927] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Nuclear receptor corepressor 1 (Ncor1) has been reported to regulate different transcription factors in different biological processes, including metabolism, inflammation, and circadian rhythms. However, the role of Ncor1 in periodontitis has not been elucidated. The aims of the present study were to investigate the role of Ncor1 in experimental periodontitis and to explore the underlying mechanisms through an experimental periodontitis model in myeloid cell-specific Ncor1-deficient mice. Myeloid cell-specific Ncor1 knockout (MNKO) mice were generated, and experimental periodontitis induced by ligation using 5-0 silk sutures was established. Ncor1 flox/flox mice were used as littermate controls (LC). Histological staining and micro-computed tomography scanning were used to evaluate osteoclastogenesis and alveolar bone resorption. Flow cytometry was conducted to observe the effect of Ncor1 on myeloid cells. RNA sequencing was used to explore the differentially targeted genes in osteoclastogenesis in the absence of Ncor1. Coimmunoprecipitation (Co-IP), chromatin immunoprecipitation (ChIP) experiments, and dual luciferase assays were performed to explore the relationship between NCoR1 and the targeted gene. Alveolar bone resorption in the MNKO mice was significantly greater than that in the LC mice after periodontitis induction and osteoclastogenesis in vitro. The percentage of CD11b+ cells, particularly CD11b+ Ly6G+ neutrophils, was substantially higher in gingival tissues in the MNKO mice than in the LC mice. Results of RNA sequencing demonstrated that CCAAT enhancer binding protein α (Cebpα) was one of the most differentially expressed genes between the MNKO and LC groups. Mechanistically, Co-IP assays, ChIP experiments, and dual luciferase assays revealed that NCOR1 interacted with peroxisome proliferator-activated receptor gamma (PPARγ) and cooperated with HDAC3 to control the transcription of Cebpα. In conclusion, Ncor1 deficiency promoted osteoclast and neutrophil formation in mice with experimental periodontitis. It regulated the transcription of Cebpα via PPARγ to promote osteoclast differentiation.
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Affiliation(s)
- X X Ma
- Department of Preventive Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Research Unit of Oral and Maxillofacial Regenerative Medicine, Chinese Academy of Medical Sciences, 639 Zhizaoju Road, Shanghai, China
| | - X Q Meng
- Laboratory of Oral Microbiota and Systemic Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, 639 Zhizaoju Road, Shanghai, China
| | - Y L Wang
- Laboratory of Oral Microbiota and Systemic Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, 639 Zhizaoju Road, Shanghai, China
| | - Y Liu
- Laboratory of Oral Microbiota and Systemic Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, 639 Zhizaoju Road, Shanghai, China
| | - X R Shi
- Laboratory of Oral Microbiota and Systemic Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, 639 Zhizaoju Road, Shanghai, China
| | - S Shao
- Department of Neurosurgery, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - S Z Duan
- Laboratory of Oral Microbiota and Systemic Diseases, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, 639 Zhizaoju Road, Shanghai, China
| | - H X Lu
- Department of Preventive Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Research Unit of Oral and Maxillofacial Regenerative Medicine, Chinese Academy of Medical Sciences, 639 Zhizaoju Road, Shanghai, China
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10
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Wang M, An M, Fan MS, Zhang SS, Sun Z, Zhao Y, Xiang ZM, Sheng J. FAEE exerts a protective effect against osteoporosis by regulating the MAPK signalling pathway. PHARMACEUTICAL BIOLOGY 2022; 60:467-478. [PMID: 35180021 PMCID: PMC8865110 DOI: 10.1080/13880209.2022.2039216] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
CONTEXT Ferulic acid ethyl ester (FAEE) is abundant in Ligusticum chuanxiong Hort. (Apiaceae) and grains, and possesses diverse biological activities; but the effects of FAEE on osteoporosis has not been reported. OBJECTIVE This study investigated whether FAEE can attenuate osteoclastogenesis and relieve ovariectomy-induced osteoporosis via attenuating mitogen-activated protein kinase (MAPK). MATERIALS AND METHODS We stimulated RAW 264.7 cells with receptor activator of NF-κB ligand (RANKL) followed by FAEE. The roles of FAEE in osteoclast production and osteogenic resorption of mature osteoclasts were evaluated by tartrate resistant acid phosphatase (TRAP) staining, expression of osteoclast-specific genes, proteins and MAPK. Ovariectomized (OVX) female Sprague-Dawley rats were administered FAEE (20 mg/kg/day) for 12 weeks to explore its potential in vivo, and then histology was undertaken in combination with cytokines analyses. RESULTS FAEE suppressed RANKL-induced osteoclast formation (96 ± 0.88 vs. 15 ± 1.68) by suppressing the expression of osteoclast-specific genes, proteins and MAPK signalling pathway related proteins (p-ERK/ERK, p-JNK/JNK and p-P38/P38) in vitro. In addition, OVX rats exposed to FAEE maintained their normal calcium (Ca) (2.72 ± 0.02 vs. 2.63 ± 0.03, p < 0.05) balance, increased oestradiol levels (498.3 ± 9.43 vs. 398.7 ± 22.06, p < 0.05), simultaneously reduced levels of bone mineral density (BMD) (0.159 ± 0.0016 vs. 0.153 ± 0.0025, p < 0.05) and bone mineral content (BMC) (0.8 ± 0.0158 vs. 0.68 ± 0.0291, p < 0.01). DISCUSSION AND CONCLUSIONS These findings suggested that FAEE could be used to ameliorate osteoporosis by the MAPK signalling pathway, suggesting that FAEE could be a potential therapeutic candidate for osteoporosis.
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Affiliation(s)
- Ming‑Yue Wang
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Food Science and Technology, Yunnan Agricultural University, Kunming, P. R. China
| | - Meng‑Fei An
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Science, Yunnan Agricultural University, Kunming, P. R. China
| | - Mao-Si Fan
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Food Science and Technology, Yunnan Agricultural University, Kunming, P. R. China
| | - Shao-Shi Zhang
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Food Science and Technology, Yunnan Agricultural University, Kunming, P. R. China
| | - Ze‑Rui Sun
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Food Science and Technology, Yunnan Agricultural University, Kunming, P. R. China
| | - Yun‑Li Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education; Yunnan Provincial Center for Research & Development of Natural Products; School of Chemical Science and Technology, Yunnan University, Kunming, P. R. China
- Yun‑Li Zhao
| | - Ze-Min Xiang
- College of Science, Yunnan Agricultural University, Kunming, P. R. China
- Ze-Min Xiang
| | - Jun Sheng
- Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming, P. R. China
- College of Science, Yunnan Agricultural University, Kunming, P. R. China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Kunming, P. R. China
- CONTACT Jun Sheng
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11
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Zhu G, Chen W, Tang CY, McVicar A, Edwards D, Wang J, McConnell M, Yang S, Li Y, Chang Z, Li YP. Knockout and Double Knockout of Cathepsin K and Mmp9 reveals a novel function of Cathepsin K as a regulator of osteoclast gene expression and bone homeostasis. Int J Biol Sci 2022; 18:5522-5538. [PMID: 36147479 PMCID: PMC9461675 DOI: 10.7150/ijbs.72211] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 08/02/2022] [Indexed: 01/26/2023] Open
Abstract
Cathepsins play a role in regulation of cell function through their presence in the cell nucleus. However, the role of Cathepsin K (Ctsk) as an epigenetic regulator in osteoclasts remains unknown. Our data demonstrated that Ctsk-/-Mmp9-/- mice have a striking phenotype with a 5-fold increase in bone volume compared with WT. RNA-seq analysis of Ctsk-/- , Mmp9-/- and Ctsk-/-/Mmp9-/- osteoclasts revealed their distinct functions in gene expression regulation, including reduced Cebpa expression, increased Nfatc1 expression, and in signaling pathways activity regulation. Western blots and qPCR data validated these changes. ATAC-seq profiling of Ctsk-/- , Mmp9-/-, and Ctsk-/-/Mmp9-/- osteoclasts indicated the changes resulted from reduced chromatin openness in the promoter region of Cebpa and increased chromatin openness in Nfatc1 promoter in Ctsk-/-/Mmp9-/- osteoclasts compared to that in osteoclasts of WT, Ctsk/- and Mmp9-/- . We found co-localization of Ctsk with c-Fos and cleavage of H3K27me3 in wild-type osteoclasts. Remarkably, cleavage of H3K27me3 was blocked in osteoclasts of Ctsk-/- and Ctsk-/-/Mmp9-/- mice, suggesting that Ctsk may epigenetically regulate distinctive groups of genes' expression by regulating proteolysis of H3K27me3. Ctsk-/-/Mmp9-/- double knockout dramatically protects against ovariectomy induced bone loss. We found that Ctsk may function as an essential epigenetic regulator in modulating levels of H3K27me3 in osteoclast activation and maintaining bone homeostasis. Our study revealed complementary and unique functions of Ctsk as epigenetic regulators for maintaining osteoclast activation and bone homeostasis by orchestrating multiple signaling pathways and targeting both Ctsk and Mmp9 is a novel therapeutic approach for osteolytic diseases such as osteoporosis.
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Affiliation(s)
- Guochun Zhu
- State Key Laboratory of Membrane Biology, School of Medicine, Center for Synthetic and Systems Biology, Tsinghua University, 100084 Beijing, China
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama 35294-2182, USA
| | - Wei Chen
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, Louisiana, 70112, USA
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama 35294-2182, USA
| | - Chen-Yi Tang
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama 35294-2182, USA
| | - Abigail McVicar
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, Louisiana, 70112, USA
| | - Diep Edwards
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, Louisiana, 70112, USA
| | - Jinwen Wang
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama 35294-2182, USA
| | - Matthew McConnell
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, Louisiana, 70112, USA
| | - Shuying Yang
- Department of Basic & Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Yang Li
- Department of Basic & Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Zhijie Chang
- State Key Laboratory of Membrane Biology, School of Medicine, Center for Synthetic and Systems Biology, Tsinghua University, 100084 Beijing, China
| | - Yi-Ping Li
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, Louisiana, 70112, USA
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama 35294-2182, USA
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12
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Yan P, Li Z, Xian S, Wang S, Fu Q, Zhu J, Yue X, Zhang X, Chen S, Zhang W, Lu J, Yin H, Huang R, Huang Z. Construction of the prognostic enhancer RNA regulatory network in osteosarcoma. Transl Oncol 2022; 25:101499. [PMID: 36001923 PMCID: PMC9421318 DOI: 10.1016/j.tranon.2022.101499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 07/08/2022] [Accepted: 07/26/2022] [Indexed: 11/30/2022] Open
Abstract
Our enhancer RNAs-based prognostic model showed good predictive ability in osteosarcoma. CCAAT enhancer binding protein alpha (CEBPA) may regulate CD8A molecule (CD8A). CD8A activation may promote CD3E molecule (CD3E) expression and activate allograft rejection in CD8+ T cells. Above signal axis provided new insights in the mechanism of osteosarcoma tumorigenesis.
Background Osteosarcoma (OS) is a common malignant tumor in osteoarticular system, the 5-year overall survival of which is poor. Enhancer RNAs (eRNAs) have been implicated in the tumorigenesis of various cancer types, whereas their roles in OS tumorigenesis remains largely unclear. Methods Differentially expressed eRNAs (DEEs), transcription factors (DETFs), target genes (DETGs) were identified using limma (Linear Models for Microarray Analysis) package. Prognosis-related DEEs were accessed by univariate Cox regression analysis. A multivariate model was constructed to evaluate the prognosis of OS samples. Prognosis-related DEEs, DETFs, DETGs, immune cells, and hallmark gene sets were co-analyzed to construct an regulatory network. Specific inhibitors were also filtered by connectivity Map analysis. External validation and scRNA-seq analysis were performed to verify our key findings. Results 3,981 DETGs, 468 DEEs, 51 DETFs, and 27 differentially expressed hallmark gene sets were identified. A total of Multivariate risk predicting model based on 18 prognosis-related DEEs showed a high accuracy (area under curve (AUC) = 0.896). GW-8510 was the candidate inhibitor targeting prognosis-related DEEs (mean = 0.670, p < 0.001). Based on the OS tumorigenesis-related regulation network, we identified that CCAAT enhancer binding protein alpha (CEBPA, DETF) may regulate CD8A molecule (CD8A, DEE), thereby promoting the transcription of CD3E molecule (CD3E, DETG), which may affect allograft rejection based on CD8+ T cells. Conclusion We constructed an eRNA-based prognostic model for predicting the OS patients’ prognosis and explored the potential regulation network for OS tumorigenesis by an integrated bioinformatics analysis, providing promising therapeutic targets for OS patients.
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Affiliation(s)
- Penghui Yan
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Zhenyu Li
- Tongji University School of Medicine, Shanghai 200092, China
| | - Shuyuan Xian
- Tongji University School of Medicine, Shanghai 200092, China
| | - Siqiao Wang
- Tongji University School of Medicine, Shanghai 200092, China; Division of Spine, Department of Orthopedics, Tongji Hospital Affiliated to Tongji University School of Medicine, Shanghai 200065, China
| | - Qing Fu
- Tongji University School of Medicine, Shanghai 200092, China
| | - Jiwen Zhu
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xi Yue
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xinkun Zhang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Department of Orthopedics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China
| | - Shaofeng Chen
- Department of Orthopedics, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China
| | - Wei Zhang
- Department of Burn Surgery, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China
| | - Jianyu Lu
- Department of Burn Surgery, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China
| | - Huabin Yin
- Department of Orthopedics, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200065, China.
| | - Runzhi Huang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Tongji University School of Medicine, Shanghai 200092, China; Department of Burn Surgery, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China.
| | - Zongqiang Huang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
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13
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Ji L, Li X, He S, Chen S. Regulation of osteoclast-mediated bone resorption by microRNA. Cell Mol Life Sci 2022; 79:287. [PMID: 35536437 PMCID: PMC11071904 DOI: 10.1007/s00018-022-04298-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/15/2022] [Accepted: 04/08/2022] [Indexed: 02/08/2023]
Abstract
Osteoclast-mediated bone resorption is responsible for bone metabolic diseases, negatively impacting people's health and life. It has been demonstrated that microRNA influences the differentiation of osteoclasts by regulating the signaling pathways during osteoclast-mediated bone resorption. So far, the involved mechanisms have not been fully elucidated. This review introduced the pathways involved in osteoclastogenesis and summarized the related microRNAs binding to their specific targets to mediate the downstream pathways in osteoclast-mediated bone resorption. We also discuss the clinical potential of targeting microRNAs to treat osteoclast-mediated bone resorption as well as the challenges of avoiding potential side effects and producing efficient delivery methods.
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Affiliation(s)
- Ling Ji
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Xinyi Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Shushu He
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
| | - Song Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
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14
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Epigenomic and Proteomic Changes in Fetal Spleens Persistently Infected with Bovine Viral Diarrhea Virus: Repercussions for the Developing Immune System, Bone, Brain, and Heart. Viruses 2022; 14:v14030506. [PMID: 35336913 PMCID: PMC8949278 DOI: 10.3390/v14030506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 02/18/2022] [Accepted: 02/20/2022] [Indexed: 12/10/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) infection during early gestation results in persistently infected (PI) immunotolerant calves that are the primary reservoirs of the virus. Pathologies observed in PI cattle include congenital defects of the brain, heart, and bone as well as marked functional defects in their immune system. It was hypothesized that fetal BVDV infection alters T cell activation and signaling genes by epigenetic mechanisms. To test this, PI and control fetal splenic tissues were collected on day 245 of gestation, 170 days post maternal infection. DNA was isolated for reduced representation bisulfite sequencing, protein was isolated for proteomics, both were analyzed with appropriate bioinformatic methods. Within set parameters, 1951 hypermethylated and 691 hypomethylated DNA regions were identified in PI compared to control fetuses. Pathways associated with immune system, neural, cardiac, and bone development were associated with heavily methylated DNA. The proteomic analysis revealed 12 differentially expressed proteins in PI vs. control animals. Upregulated proteins were associated with protein processing, whereas downregulated proteins were associated with lymphocyte migration and development in PI compared to control fetal spleens. The epigenetic changes in DNA may explain the immune dysfunctions, abnormal bone formation, and brain and heart defects observed in PI animals.
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15
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Yang B, Sun H, Jia M, He Y, Luo Y, Wang T, Wu Y, Wang J. DNA damage-inducible transcript 3 restrains osteoclast differentiation and function. Bone 2021; 153:116162. [PMID: 34455116 DOI: 10.1016/j.bone.2021.116162] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/19/2021] [Accepted: 08/20/2021] [Indexed: 02/05/2023]
Abstract
DNA damage-inducible transcript 3 (DDIT3), a member of the CCAAT/enhancer-binding protein (C/EBP) family, is involved in cellular apoptosis and differentiation. DDIT3 participates in the regulation of adipogenesis and osteogenesis in vitro and in vivo. However, the role of DDIT3 in osteoclastogenesis is not yet known. In this study, the involvement of DDIT3 in osteoclast differentiation and function was reported for the first time. CRISPR/Cas9-mediated DDIT3 knockout (KO) mice were generated for functional assessment. Tartrate-resistant acid phosphatase (TRAP) staining of distal femurs showed increased positive cells in DDIT3 KO mice. DDIT3 expression was downregulated during the receptor activator of nuclear factor κB ligand (RANKL)-induced osteoclast differentiation of bone marrow-derived macrophages (BMMs). The loss of DDIT3 increased the expression of osteoclast-specific markers, including nuclear factor of activated T-cells cytoplasmic 1 (NFATc1), TRAP, cathepsin K (CTSK), and dendritic cell-specific transmembrane protein (DC-STAMP) and promoted the formation of TRAP-positive multinucleated osteoclasts. The actin ring number and resorption area of bone slices were also increased in DDIT3 KO BMMs. Lentivirus-mediated DDIT3 overexpression significantly inhibited the osteoclast differentiation of RAW264.7 cells. In the tumor necrosis factor-α-induced osteolysis model, DDIT3 deficiency enhanced osteoclast formation and aggravated bone resorption. DDIT3 inhibited osteoclast differentiation by regulating the C/EBPα-CTSK axis. Furthermore, DDIT3 KO intensified the RANKL-triggered activation of the MAPKs and Akt signaling pathways. Taken together, the results revealed the essential role of DDIT3 in osteoclastogenesis in vitro and in vivo and its close relationship with osteoclast-associated transcription factors and pathways.
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Affiliation(s)
- Beining Yang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Hualing Sun
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Meie Jia
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Ying He
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Yao Luo
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Tianqi Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China
| | - Yanru Wu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China.
| | - Jiawei Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, Hubei, China.
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16
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Li J, Lu L, Liu Y, Yu X. Bone marrow adiposity during pathologic bone loss: molecular mechanisms underlying the cellular events. J Mol Med (Berl) 2021; 100:167-183. [PMID: 34751809 DOI: 10.1007/s00109-021-02164-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 10/09/2021] [Accepted: 11/03/2021] [Indexed: 02/05/2023]
Abstract
Bone marrow (BM) is a heterogeneous niche where bone marrow stromal cells (BMSCs), osteoblasts, osteoclasts, adipocytes, hematopoietic cells, and immune cells coexist. The cellular composition of BM changes with various pathophysiological states. A reduction in osteoblast number and a concomitant increase in adipocyte number in aging and pathological conditions put bone marrow adipose tissue (BMAT) into spotlight. Accumulating evidence strongly supports that an overwhelming production of BMAT is a major contributor to bone loss disorders. Therefore, BMAT-targeted therapy can be an efficient and feasible intervention for osteoporosis. However, compared to blocking bone-destroying molecules produced by BMAT, suppressing BMAT formation is theoretically a more effective and fundamental approach in treating osteoporotic bone diseases. Thus, a deep insight into the molecular basis underlying increased BM adiposity during pathologic bone loss is critical to formulate strategies for therapeutically manipulating BMAT. In this review, we comprehensively summarize the molecular mechanisms involved in adipocyte differentiation of BMSCs as well as the interaction between bone marrow adipocytes and osteoclasts. More importantly, we further discuss the potential clinical implications of therapeutically targeting the upstream of BMAT formation in bone loss diseases.
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Affiliation(s)
- Jiao Li
- Department of Endocrinology and Metabolism, Laboratory of Endocrinology and Metabolism, Rare Disease Center, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu, 610041, Sichuan Province, China
| | - Lingyun Lu
- Department of Endocrinology and Metabolism, Laboratory of Endocrinology and Metabolism, Rare Disease Center, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu, 610041, Sichuan Province, China
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yi Liu
- Department of Rheumatology and Immunology, Rare Disease Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xijie Yu
- Department of Endocrinology and Metabolism, Laboratory of Endocrinology and Metabolism, Rare Disease Center, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu, 610041, Sichuan Province, China
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17
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Xu Y, Ma J, Xu G, Ma D. Recent advances in the epigenetics of bone metabolism. J Bone Miner Metab 2021; 39:914-924. [PMID: 34250565 DOI: 10.1007/s00774-021-01249-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 07/03/2021] [Indexed: 12/22/2022]
Abstract
Osteoporosis is a common form of metabolic bone disease that is costly to treat and is primarily diagnosed on the basis of bone mineral density. As the influences of genetic lesions and environmental factors are increasingly studied in the pathological development of osteoporosis, regulated epigenetics are emerging as the important pathogenesis mechanisms in osteoporosis. Recently, osteoporosis genome-wide association studies and multi-omics technologies have revealed that susceptibility loci and the misregulation of epigenetic modifiers are key factors in osteoporosis. Over the past decade, extensive studies have demonstrated epigenetic mechanisms, such as DNA methylation, histone/chromatin modifications, and non-coding RNAs, as potential contributing factors in osteoporosis that affect disease initiation and progression. Herein, we review recent advances in epigenetics in osteoporosis, with a focus on exploring the underlying mechanisms and potential diagnostic/prognostic biomarker applications for osteoporosis.
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Affiliation(s)
- Yuexin Xu
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Jing Ma
- Department of Facial Plastic and Reconstructive Surgery, ENT Institute, Eye and ENT Hospital, Fudan University, Shanghai, China
| | - Guohua Xu
- Department of Orthopedic Surgery, The Spine Surgical Center, Changzheng Hospital, Second Military Medical University, Shanghai, 20000, China.
| | - Duan Ma
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, China.
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18
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Chen D, Wang Q, Li Y, Sun P, Kuek V, Yuan J, Yang J, Wen L, Wang H, Xu J, Chen P. Notopterol Attenuates Estrogen Deficiency-Induced Osteoporosis via Repressing RANKL Signaling and Reactive Oxygen Species. Front Pharmacol 2021; 12:664836. [PMID: 34149419 PMCID: PMC8210423 DOI: 10.3389/fphar.2021.664836] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 04/20/2021] [Indexed: 12/31/2022] Open
Abstract
Integrity of the skeleton is sustained through the balanced activities of osteoblasts and osteoclasts in bone remodeling unit. The balance can be disrupted by excessive osteoclasts activation commonly seen in osteoporosis. Notopterol (NOT) is a main component of Notopterygium incisum which exerts a wide spectrum effect on biomedical pharmacology. In our study, we found NOT serves as an inhibitor in regulating RANKL-activated osteoclasts formation and bone resorption function by calculating tartrate resistant acid phosphatase (TRAcP) staining and hydroxyapatite resorption assays. Furthermore, RANKL-mediated signaling pathways including MAPK, NF-κB and calcium ossification were hampered, whereas ROS scavenging enzymes in Nrf2/Keap1/ARE signaling pathways were promoted by NOT. In addition, the activation of the essential transcription factor NFATc1 in RANKL-mediated osteoclastogenesis was almost totally suppressed by NOT. What is more, NOT diminished the loss of bone mass in preclinical model of OVX mice by blocking osteoclastogenesis determined by bone histomorphometry, TRAcP staining and H&E staining. Conclusively, our findings demonstrated that NOT could arrest osteoclastogenesis and bone resorptive activity by attenuating RANKL-mediated MAPK, NF-κB, calcium and NFATc1 signaling transduction pathways and enhancing ROS scavenging enzymes in Nrf2/Keap1/ARE pathways in vitro, and prohibit bone loss induced by OVX in vivo. Taken together, NOT may be identified to be a natural and novel treatment for osteolytic diseases.
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Affiliation(s)
- Delong Chen
- Department of Orthopaedic Surgery, Clifford Hospital, Jinan University, Guangzhou, China.,School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia
| | - Qingqing Wang
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ying Li
- Department of Orthopaedic Surgery, Third Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ping Sun
- Department of Endocrinology, First Affiliated Hospital, Guangdong Pharmaceutical University, Guangzhou, China
| | - Vincent Kuek
- School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia
| | - Jinbo Yuan
- School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia
| | - Junzheng Yang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Longfei Wen
- Department of Orthopaedic Surgery, Clifford Hospital, Jinan University, Guangzhou, China
| | - Haibin Wang
- Department of Orthopaedic Surgery, First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jiake Xu
- School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia
| | - Peng Chen
- Department of Orthopaedic Surgery, First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China
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19
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Yuan L, Zhao N, Wang J, Liu Y, Meng L, Guo S, Wiemer EA, Chen Q, Mao Y, Ben J, Ma J. Major vault protein (MVP) negatively regulates osteoclastogenesis via calcineurin-NFATc1 pathway inhibition. Theranostics 2021; 11:7247-7261. [PMID: 34158848 PMCID: PMC8210610 DOI: 10.7150/thno.58468] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 05/10/2021] [Indexed: 02/06/2023] Open
Abstract
Rationale: Bone homeostasis is maintained by a balanced interplay of osteoblasts and osteoclasts. Osteoclasts are derived from monocyte/macrophage lineage. Major vault protein (MVP) is known to promote apoptosis and prevent metabolic diseases in macrophage. However, whether MVP is involved in osteoclastogenesis is unknown. Here, we identified an important function of MVP as a negative regulator of osteoclastogenesis and its therapeutic potential in preventing bone loss. Methods: Expression of MVP in osteoclasts was investigated in human tumor tissues with immunohistochemical staining. Next, we generated total body (Mvp-/- ) and monocyte-specific (Mvpf/fLyz2-Cre) MVP gene knockout mice to observe bone phenotype and osteoclastogenesis using micro-CT and bone histomorphometry. Moreover, we examined the effects of MVP on osteoclast differentiation, bone resorption, NFATc1 activation and calcium oscillations in vitro. Finally, we explored the clinical potential of targeting MVP in two osteoporosis mouse models and used an adeno-associated virus (AAV) gene to overexpress MVP locally in mice. Results: We found that Mvp-/- and Mvpf/fLyz2-Cre mice both exhibited osteoporosis-like phenotypes. MVP-deficiency also enhanced calcineurin-NFATc1 signaling and promoted NFATc1 activity, which led to enhanced osteoclastogenesis and bone resorption. Calcineurin inhibition using the small molecule inhibitor FK506 corrected the enhanced osteoclastogenesis in Mvpf/fLyz2-Cre group. Additionally, MVP reexpression in Mvpf/fLyz2-Cre group rescued calcineurin expression. MVP overexpression in wild-type mice prevented pathologic bone loss in mouse models of ovariectomized (OVX) and calvaria-adjacent lipopolysaccharide (LPS)-injected. Conclusions: Our data suggested that MVP negatively regulates osteoclast differentiation and bone resorption via inhibition of calcineurin-NFATc1 signaling. In osteoclast-related bone diseases such as osteoporosis, manipulation of MVP activity may be an attractive therapeutic target.
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20
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Zhao X, Patil S, Xu F, Lin X, Qian A. Role of Biomolecules in Osteoclasts and Their Therapeutic Potential for Osteoporosis. Biomolecules 2021; 11:747. [PMID: 34067783 PMCID: PMC8156890 DOI: 10.3390/biom11050747] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/12/2021] [Accepted: 05/13/2021] [Indexed: 02/06/2023] Open
Abstract
Osteoclasts (OCs) are important cells that are involved in the regulation of bone metabolism and are mainly responsible for coordinating bone resorption with bone formation to regulate bone remodeling. The imbalance between bone resorption and formation significantly affects bone metabolism. When the activity of osteoclasts exceeds the osteoblasts, it results in a condition called osteoporosis, which is characterized by reduced bone microarchitecture, decreased bone mass, and increased occurrences of fracture. Molecules, including transcription factors, proteins, hormones, nucleic acids, such as non-coding RNAs, play an important role in osteoclast proliferation, differentiation, and function. In this review, we have highlighted the role of these molecules in osteoclasts regulation and osteoporosis. The developed therapeutics targeting these molecules for the treatment of osteoporosis in recent years have also been discussed with challenges faced in clinical application.
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Affiliation(s)
- Xin Zhao
- School of Pharmacy, Shaanxi Institute of International Trade & Commerce, Xi’an 712046, China;
| | - Suryaji Patil
- Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi’an 710072, China; (S.P.); (F.X.); (X.L.)
| | - Fang Xu
- Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi’an 710072, China; (S.P.); (F.X.); (X.L.)
| | - Xiao Lin
- Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi’an 710072, China; (S.P.); (F.X.); (X.L.)
| | - Airong Qian
- Xi’an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi’an 710072, China; (S.P.); (F.X.); (X.L.)
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21
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Kang DW, Hwang WC, Noh YN, Che X, Lee SH, Jang Y, Choi KY, Choi JY, Min DS. Deletion of phospholipase D1 decreases bone mass and increases fat mass via modulation of Runx2, β-catenin-osteoprotegerin, PPAR-γ and C/EBPα signaling axis. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166084. [PMID: 33497821 DOI: 10.1016/j.bbadis.2021.166084] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 01/12/2021] [Accepted: 01/20/2021] [Indexed: 11/16/2022]
Abstract
In osteoporosis, mesenchymal stem cells (MSCs) prefer to differentiate into adipocytes at the expense of osteoblasts. Although the balance between adipogenesis and osteogenesis has been closely examined, the mechanism of commitment determination switch is unknown. Here we demonstrate that phospholipase D1 (PLD1) plays a key switch in determining the balance between bone and fat mass. Ablation of Pld1 reduced bone mass but increased fat in mice. Mechanistically, Pld1/- MSCs inhibited osteoblast differentiaion with diminished Runx2 expression, while osteoclast differentiation was accelerated in Pld1-/- bone marrow-derived macrophages. Pld1-/- osteoblasts showed decreased expression of osteogenic makers. Increased number and resorption activity of osteoclasts in Pld1-/- mice were corroborated with upregulation of osteoclastogenic markers. Moreover, Pld1-/- osteoblasts reduced β-catenin mediated-osteoprotegerin (OPG) with increased RANKL/OPG ratio which resulted in accelerated osteoclast differentiation. Thus, low bone mass with upregulated osteoclasts could be due to the contribution of both osteoblasts and osteoclasts during bone remodeling. Moreover, ablation of Pld1 further increased bone loss in ovariectomized mice, suggesting that PLD1 is a negative regulator of osteoclastogenesis. Furthermore, loss of PLD1 increased adipogenesis, body fat mass, and hepatic steatosis along with upregulation of PPAR-γ and C/EBPα. Interestingly, adipocyte-specific Pld1 transgenic mice rescued the compromised phenotypes of fat mass and adipogenesis in Pld1 knockout mice. Collectively, PLD1 regulated the bifurcating pathways of mesenchymal cell lineage into increased osteogenesis and decreased adipogenesis, which uncovered a previously unrecognized role of PLD1 in homeostasis between bone and fat mass.
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Affiliation(s)
- Dong Woo Kang
- Department of Molecular Biology, College of Natural Science, Pusan National University, Busan 609-735, Republic of Korea; Institute for Innovative Cancer Research, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Won Chan Hwang
- Department of Molecular Biology, College of Natural Science, Pusan National University, Busan 609-735, Republic of Korea; College of Pharmacy, Yonsei University, Incheon 21983, Republic of Korea
| | - Yu Na Noh
- Department of Molecular Biology, College of Natural Science, Pusan National University, Busan 609-735, Republic of Korea
| | - Xiangguo Che
- Department of Biochemistry and Cell Biology, Korea Mouse Phenotyping Center, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea
| | - Soung-Hoon Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, Republic of Korea
| | - Younghoon Jang
- Department of Biology and Chemistry, Changwon National University, Changwon, Republic of Korea
| | - Kang-Yell Choi
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, Republic of Korea
| | - Je-Yong Choi
- Department of Biochemistry and Cell Biology, Korea Mouse Phenotyping Center, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea
| | - Do Sik Min
- College of Pharmacy, Yonsei University, Incheon 21983, Republic of Korea.
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22
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Tang CY, Wu M, Zhao D, Edwards D, McVicar A, Luo Y, Zhu G, Wang Y, Zhou HD, Chen W, Li YP. Runx1 is a central regulator of osteogenesis for bone homeostasis by orchestrating BMP and WNT signaling pathways. PLoS Genet 2021; 17:e1009233. [PMID: 33476325 PMCID: PMC7819607 DOI: 10.1371/journal.pgen.1009233] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 10/29/2020] [Indexed: 12/23/2022] Open
Abstract
Runx1 is highly expressed in osteoblasts, however, its function in osteogenesis is unclear. We generated mesenchymal progenitor-specific (Runx1f/fTwist2-Cre) and osteoblast-specific (Runx1f/fCol1α1-Cre) conditional knockout (Runx1 CKO) mice. The mutant CKO mice with normal skeletal development displayed a severe osteoporosis phenotype at postnatal and adult stages. Runx1 CKO resulted in decreased osteogenesis and increased adipogenesis. RNA-sequencing analysis, Western blot, and qPCR validation of Runx1 CKO samples showed that Runx1 regulates BMP signaling pathway and Wnt/β-catenin signaling pathway. ChIP assay revealed direct binding of Runx1 to the promoter regions of Bmp7, Alk3, and Atf4, and promoter mapping demonstrated that Runx1 upregulates their promoter activity through the binding regions. Bmp7 overexpression rescued Alk3, Runx2, and Atf4 expression in Runx1-deficient BMSCs. Runx2 expression was decreased while Runx1 was not changed in Alk3 deficient osteoblasts. Atf4 overexpression in Runx1-deficient BMSCs did not rescue expression of Runx1, Bmp7, and Alk3. Smad1/5/8 activity was vitally reduced in Runx1 CKO cells, indicating Runx1 positively regulates the Bmp7/Alk3/Smad1/5/8/Runx2/ATF4 signaling pathway. Notably, Runx1 overexpression in Runx2-/- osteoblasts rescued expression of Atf4, OCN, and ALP to compensate Runx2 function. Runx1 CKO mice at various osteoblast differentiation stages reduced Wnt signaling and caused high expression of C/ebpα and Pparγ and largely increased adipogenesis. Co-culture of Runx1-deficient and wild-type cells demonstrated that Runx1 regulates osteoblast-adipocyte lineage commitment both cell-autonomously and non-autonomously. Notably, Runx1 overexpression rescued bone loss in OVX-induced osteoporosis. This study focused on the role of Runx1 in different cell populations with regards to BMP and Wnt signaling pathways and in the interacting network underlying bone homeostasis as well as adipogenesis, and has provided new insight and advancement of knowledge in skeletal development. Collectively, Runx1 maintains adult bone homeostasis from bone loss though up-regulating Bmp7/Alk3/Smad1/5/8/Runx2/ATF4 and WNT/β-Catenin signaling pathways, and targeting Runx1 potentially leads to novel therapeutics for osteoporosis.
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Affiliation(s)
- Chen-Yi Tang
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
- Department of Metabolism & Endocrinology, Hunan provincial Key Laboratory of Metabolic Bone Diseases, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Mengrui Wu
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
- Institute of Genetics, Life Science College, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
| | - Dongfeng Zhao
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
- Shanghai University of Traditional Chinese Medicine, Pudong, Shanghai, China P.R
| | - Diep Edwards
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
| | - Abigail McVicar
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
| | - Yuan Luo
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
| | - Guochun Zhu
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
| | - Yongjun Wang
- Shanghai University of Traditional Chinese Medicine, Pudong, Shanghai, China P.R
| | - Hou-De Zhou
- Department of Metabolism & Endocrinology, Hunan provincial Key Laboratory of Metabolic Bone Diseases, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Wei Chen
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
- * E-mail: (WC); (Y-PL)
| | - Yi-Ping Li
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama, United States of America
- * E-mail: (WC); (Y-PL)
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23
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Epigenetic Regulators Involved in Osteoclast Differentiation. Int J Mol Sci 2020; 21:ijms21197080. [PMID: 32992908 PMCID: PMC7583862 DOI: 10.3390/ijms21197080] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 09/19/2020] [Accepted: 09/21/2020] [Indexed: 12/17/2022] Open
Abstract
Age related changes to the skeleton, such as osteoporosis, increase the risk of fracture and morbidity in the elderly population. In osteoporosis, bone remodeling becomes unbalanced with an increase in bone resorption and a decrease in bone formation. Osteoclasts are large multinucleated cells that secrete acid and proteases to degrade and resorb bone. Understanding the molecular mechanisms that regulate osteoclast differentiation and activity will provide insight as to how hyper-active osteoclasts lead to pathological bone loss, contributing to diseases such as osteoporosis. Reversible modifications to the DNA such as histone acetylation, methylation, phosphorylation and ubiquitylation alters the access of transcriptional machinery to DNA and regulates gene expression and osteoclast differentiation and activity. It is critical for the management of bone related diseases to understand the role of these chromatin modifying proteins during osteoclast differentiation, as potential therapies targeting these proteins are currently under development.
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24
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Kurotaki D, Yoshida H, Tamura T. Epigenetic and transcriptional regulation of osteoclast differentiation. Bone 2020; 138:115471. [PMID: 32526404 DOI: 10.1016/j.bone.2020.115471] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/04/2020] [Accepted: 06/04/2020] [Indexed: 01/28/2023]
Abstract
Osteoclasts are derived from mononuclear phagocyte lineage cells and are indispensable for bone resorption. Recent findings suggest that fetal yolk sac macrophage progenitors give rise to neonatal osteoclasts, while hematopoietic stem cell-derived cells, such as monocytes, contribute to maintaining osteoclast syncytia in vivo. Osteoclast differentiation is dependent on macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL) signaling that mediates global epigenetic and transcriptional changes. PU.1 is a transcription factor that establishes cell type-specific enhancer landscapes in osteoclast precursors and mature osteoclasts by collaborating with interferon regulatory factor-8 (IRF8) and nuclear factor of activated T-cells (NFATc1), respectively. Irf8 and Nfatc1 genes are tightly controlled by epigenetic mechanisms such as DNA methylation and histone modifications during osteoclastogenesis. Thus, key transcription factors orchestrate osteoclast-specific transcription regulatory networks through epigenetic modifications. In this review, we discuss recent advances in our understanding of the molecular mechanisms involved in osteoclast development.
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Affiliation(s)
- Daisuke Kurotaki
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0004, Japan.
| | - Haruka Yoshida
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0004, Japan
| | - Tomohiko Tamura
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0004, Japan
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25
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Jiao Y, Chen C, Hu X, Feng X, Shi Z, Cao J, Li Q, Zhu Y. Niclosamide and its derivative DK-520 inhibit RANKL-induced osteoclastogenesis. FEBS Open Bio 2020; 10:1685-1697. [PMID: 32602250 PMCID: PMC7396435 DOI: 10.1002/2211-5463.12921] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 06/05/2020] [Accepted: 06/09/2020] [Indexed: 01/13/2023] Open
Abstract
Niclosamide is a potent inhibitor of osteoclastogenesis and bone remodeling. DK‐520 is an acyl derivative of Niclosamide and significantly increased both the plasma concentration and the duration of exposure of Niclosamide when dosed orally. However, at present the effect of DK‐520 on osteoclastogenesis has not been reported. Here, we investigated whether DK‐520 can regulate receptor activator of nuclear factor‐κB ligand (RANKL)‐induced osteoclastogenesis of bone marrow macrophages (BMMs) in vitro. Following induction of BMMs with RANKL for three days, we detected differentiated osteoclasts with typical morphology and high levels of tartrate‐resistant acid phosphatase (TRAP), RANKL, and cathepsin K (CTSK) expression. Treatment with either Niclosamide or DK‐520 did not affect the viability of osteoclast precursors (OCPs), but significantly inhibited RANKL‐induced transdifferentiation of macrophages into OCPs, particularly in the early stage of osteoclastogenesis. Both Niclosamide and DK‐520 significantly decreased the relative levels of transcription factor PU.1 mRNA transcripts and dendritic cell‐specific transmembrane protein (DC‐STAMP), but not v‐ATPasev0d2 protein expression in OCPs. In addition, the inhibitory effect of DK‐520 on osteoclastogenesis is realized through impairment of the NF‐kB (nuclear factor‐κB) and MAPK (mitogen‐activated protein kinase) signaling pathways. These results demonstrate that DK‐520, like Niclosamide, effectively inhibits the early stage of osteoclastogenesis. The findings presented here, together with its increased oral plasma concentrations and bioavailability, suggest that DK‐520 may be a promising drug candidate for treatment of osteoclast‐related diseases.
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Affiliation(s)
- Yurui Jiao
- Department of Endocrinology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Chenglong Chen
- Musculoskeletal Tumor Center, Peking University People's Hospital, Beijing, China
| | - Xijian Hu
- Department of Orthopedics, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Xu Feng
- Department of Pathology, University of Alabama at Birmingham, AL, USA
| | - Zhenqi Shi
- Department of Pathology, University of Alabama at Birmingham, AL, USA
| | - Jie Cao
- Department of Endocrinology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Qing Li
- Department of Endocrinology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Yikun Zhu
- Department of Endocrinology, The Second Hospital of Shanxi Medical University, Taiyuan, China
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26
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Muruganandan S, Ionescu AM, Sinal CJ. At the Crossroads of the Adipocyte and Osteoclast Differentiation Programs: Future Therapeutic Perspectives. Int J Mol Sci 2020; 21:ijms21072277. [PMID: 32224846 PMCID: PMC7177886 DOI: 10.3390/ijms21072277] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 01/01/2023] Open
Abstract
The coordinated development and function of bone-forming (osteoblasts) and bone-resorbing (osteoclasts) cells is critical for the maintenance of skeletal integrity and calcium homeostasis. An enhanced adipogenic versus osteogenic potential of bone marrow mesenchymal stem cells (MSCs) has been linked to bone loss associated with diseases such as diabetes mellitus, as well as aging and postmenopause. In addition to an inherent decrease in bone formation due to reduced osteoblast numbers, recent experimental evidence indicates that an increase in bone marrow adipocytes contributes to a disproportionate increase in osteoclast formation. Therefore, a potential strategy for therapeutic intervention in chronic bone loss disorders such as osteoporosis is to interfere with the pro-osteoclastogenic influence of marrow adipocytes. However, application of this approach is limited by the extremely complex regulatory processes in the osteoclastogenic program. For example, key regulators of osteoclastogenesis such as the receptor activator of nuclear factor-kappaB ligand (RANKL) and the soluble decoy receptor osteoprotegerin (OPG) are not only secreted by both osteoblasts and adipocytes, but are also regulated through several cytokines produced by these cell types. In this context, biologically active signaling molecules secreted from bone marrow adipocytes, such as chemerin, adiponectin, leptin, visfatin and resistin, can have a profound influence on the osteoclast differentiation program of hematopoietic stem cells (HSCs), and thus, hold therapeutic potential under disease conditions. In addition to these paracrine signals, adipogenic transcription factors including CCAAT/enhancer binding protein alpha (C/EBPα), C/EBP beta (C/EBPβ) and peroxisome proliferator-associated receptor gamma (PPARγ) are also expressed by osteoclastogenic cells. However, in contrast to MSCs, activation of these adipogenic transcription factors in HSCs promotes the differentiation of osteoclast precursors into mature osteoclasts. Herein, we discuss the molecular mechanisms that link adipogenic signaling molecules and transcription factors to the osteoclast differentiation program and highlight therapeutic strategies targeting these mechanisms for promoting bone homeostasis.
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Affiliation(s)
- Shanmugam Muruganandan
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA;
- Correspondence: ; Tel.: +614-971-0412
| | - Andreia M. Ionescu
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA;
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27
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Zhang Y, Wang H, Zhu G, Qian A, Chen W. F2r negatively regulates osteoclastogenesis through inhibiting the Akt and NFκB signaling pathways. Int J Biol Sci 2020; 16:1629-1639. [PMID: 32226307 PMCID: PMC7097923 DOI: 10.7150/ijbs.41867] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 01/05/2020] [Indexed: 12/13/2022] Open
Abstract
G-protein-coupled receptors (GPCRs) are pivotal drug targets for many diseases. Coagulation Factor II Thrombin Receptor (F2R) is an important member of GPCR family that is highly expressed in osteoclasts. However, the role of F2r in osteoclasts is still unclear. Here, to examine the functions of F2r on osteoclast formation, differentiation, activation, survival, and acidification, we employed loss-of-function and gain-of-function approaches to study F2r using F2r-targeted short hairpin RNA (sh-F2r) lentivirus and overexpression plasmid pLX304-F2r lentivirus respectively, in mouse bone marrow cells (MBMs) induced osteoclasts. We used three shRNAs targeting F2r which had the ability to efficiently and consistently knock down the expression of F2r at different levels. Notably, F2r knockdown trigged a significant increase in osteoclast activity, number, and size, as well as promoted bone resorption and F-actin ring formation with increased osteoclast marker gene expression. Moreover, F2r overexpression blocked osteoclast formation, maturation, and acidification, indicating that F2r negatively regulates osteoclast formation and function. Furthermore, we investigated the mechanism(s) underlying the role of F2r in osteoclasts. We detected RANKL-induced signaling pathways related protein changes F2r knockdown cells and found significantly increased pAkt levels in sh-F2r infected cells, as well as significantly enhanced phosphorylation of p65 and IKBα in early stages of RANKL stimulation. These data demonstrated that F2r responds to RANKL stimulation to attenuate osteoclastogenesis through inhibiting the both F2r-Akt and F2r-NFκB signaling pathways, which lead a reduction in the expression of osteoclast genes. Our study suggests that targeting F2r may be a novel therapeutic approach for bone diseases, such as osteoporosis.
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Affiliation(s)
- Yan Zhang
- Laboratory for Bone Metabolism, Key Lab for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China
- Department of Pathology, The School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - He Wang
- Department of Pathology, The School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Guochun Zhu
- Department of Pathology, The School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Airong Qian
- Laboratory for Bone Metabolism, Key Lab for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China
| | - Wei Chen
- Department of Pathology, The School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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28
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Regulation of Osteoclast Differentiation and Skeletal Maintenance by Histone Deacetylases. Molecules 2019; 24:molecules24071355. [PMID: 30959867 PMCID: PMC6479495 DOI: 10.3390/molecules24071355] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/28/2019] [Accepted: 04/04/2019] [Indexed: 12/21/2022] Open
Abstract
Bone is a dynamic tissue that must respond to developmental, repair, and remodeling cues in a rapid manner with changes in gene expression. Carefully-coordinated cycles of bone resorption and formation are essential for healthy skeletal growth and maintenance. Osteoclasts are large, multinucleated cells that are responsible for breaking down bone by secreting acids to dissolve the bone mineral and proteolytic enzymes that degrade the bone extracellular matrix. Increased osteoclast activity has a severe impact on skeletal health, and therefore, osteoclasts represent an important therapeutic target in skeletal diseases, such as osteoporosis. Progression from multipotent progenitors into specialized, terminally-differentiated cells involves carefully-regulated patterns of gene expression to control lineage specification and emergence of the cellular phenotype. This process requires coordinated action of transcription factors with co-activators and co-repressors to bring about proper activation and inhibition of gene expression. Histone deacetylases (HDACs) are an important group of transcriptional co-repressors best known for reducing gene expression via removal of acetyl modifications from histones at HDAC target genes. This review will cover the progress that has been made recently to understand the role of HDACs and their targets in regulating osteoclast differentiation and activity and, thus, serve as potential therapeutic target.
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29
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Abstract
Bone is a crucial element of the skeletal-locomotor system, but also functions as an immunological organ that harbors hematopoietic stem cells (HSCs) and immune progenitor cells. Additionally, the skeletal and immune systems share a number of regulatory molecules, including cytokines and signaling molecules. Osteoimmunology was created as an interdisciplinary field to explore the shared molecules and interactions between the skeletal and immune systems. In particular, the importance of an inseparable link between the two systems has been highlighted by studies on the pathogenesis of rheumatoid arthritis (RA), in which pathogenic helper T cells induce the progressive destruction of multiple joints through aberrant expression of receptor activator of nuclear factor (NF)-κB ligand (RANKL). The conceptual bridge of osteoimmunology provides not only a novel framework for understanding these biological systems but also a molecular basis for the development of therapeutic approaches for diseases of bone and/or the immune system.
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Affiliation(s)
- Kazuo Okamoto
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroshi Takayanagi
- Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
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30
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Huang H, Wang J, Zhang Y, Zhu G, Li YP, Ping J, Chen W. Bone resorption deficiency affects tooth root development in RANKL mutant mice due to attenuated IGF-1 signaling in radicular odontoblasts. Bone 2018; 114:161-171. [PMID: 29292230 DOI: 10.1016/j.bone.2017.12.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 11/27/2017] [Accepted: 12/28/2017] [Indexed: 01/05/2023]
Abstract
The tooth root is essential for normal tooth physiological function. Studies on mice with mutations or targeted gene deletions revealed that osteoclasts (OCs) play an important role in tooth root development. However, knowledge on the cellular and molecular mechanism underlying how OCs mediate root formation is limited. During bone formation, growth factors (e.g. Insulin-like growth factor-1, IGF-1) liberated from bone matrix by osteoclastic bone resorption stimulate osteoblast differentiation. Thus, we hypothesize that OC-osteoblast coupling may also apply to OC-odontoblast coupling; therefore OCs may have a direct impact on odontoblast differentiation through the release of growth factor(s) from bone matrix, and consequently regulate tooth root formation. To test this hypothesis, we used a receptor activator of NF-κB ligand (RANKL) knockout mouse model in which OC differentiation and function was entirely blocked. We found that molar root formation and tooth eruption were defective in RANKL-/- mice. Disrupted elongation and disorganization of Hertwig's epithelial root sheath (HERS) was observed in RANKL-/- mice. Reduced expression of nuclear factor I C (NFIC), osterix, and dentin sialoprotein, markers essential for radicular (root) odontogenic cell differentiation indicated that odontoblast differentiation was disrupted in RANKL deficient mice likely contributing to the defect in root formation. Moreover, down-regulation of IGF/AKT/mTOR activity in odontoblast indicated that IGF signaling transduction in odontoblasts of the mutant mice was impaired. Treating odontoblast cells in vitro with conditioned medium from RANKL-/- OCs cultured on bone slices resulted in inhibition of odontoblast differentiation. Moreover, depletion of IGF-1 in bone resorption-conditioned medium (BRCM) from wild-type (WT) OC significantly compromised the ability of WT osteoclastic BRCM to induce odontoblast differentiation while addition of IGF-1 into RANKL-/- osteoclastic BRCM rescued impaired odontoblast differentiation, confirming that root and eruption defect in RANKL deficiency mice may result from failure of releasing of IGF-1 from bone matrix through OC bone resorption. These results suggest that OCs are important for odontoblast differentiation and tooth root formation, possibly through IGF/AKT/mTOR signaling mediated by cell-bone matrix interaction. These findings provide significant insights into regulatory mechanism of tooth root development, and also lay the foundation for root regeneration studies.
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Affiliation(s)
- Hong Huang
- The Affiliated Hospital of Stomatology, Chongqing Medical University, 5 Shangqingsi Rd, Yuzhong Qu, Chongqing Shi 400065, China; Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA
| | - Jue Wang
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA
| | - Yan Zhang
- The Affiliated Hospital of Stomatology, Chongqing Medical University, 5 Shangqingsi Rd, Yuzhong Qu, Chongqing Shi 400065, China; Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA
| | - Guochun Zhu
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA
| | - Yi-Ping Li
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA
| | - Ji Ping
- The Affiliated Hospital of Stomatology, Chongqing Medical University, 5 Shangqingsi Rd, Yuzhong Qu, Chongqing Shi 400065, China.
| | - Wei Chen
- Department of Pathology, School of Medicine, University of Alabama at Birmingham, 1825 University Blvd., Birmingham, AL 35294, USA.
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31
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Wang L, Guo X, Zhou W, Ding Y, Shi J, Wu X, Liu Y, Xu Y, Yang H, Geng D. Protein phosphatase 2A as a new target for downregulating osteoclastogenesis and alleviating titanium particle-induced bone resorption. Acta Biomater 2018; 73:488-499. [PMID: 29656074 DOI: 10.1016/j.actbio.2018.04.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 03/17/2018] [Accepted: 04/05/2018] [Indexed: 12/28/2022]
Abstract
Receptor activator of nuclear factor-кB ligand (RANKL)-induced osteoclastogenesis is believed to play a critical role in osteolytic diseases including peri-prosthetic osteolysis (PPO), the primary reason for implant failure and revision surgery. In this study, we observed that protein phosphatase 2A (PP2A), a major serine-threonine phosphatase, was highly expressed in human periprosthetic interface membranes with aseptic loosening and in a murine osteolysis model induced by titanium particle irritation. PP2A inhibition effectively alleviated titanium particle-induced bone destruction at osteolytic sites. In addition, PP2A downregulation significantly decreased osteoclast numbers and RANKL expression, compared with in animals treated with only titanium. Mechanistically, a PP2A selective inhibitor or PP2A siRNA suppressed osteoclastogenesis and alleviated osteoclastic resorption by inhibiting the RANKL-induced nuclear factor-кB and c-Jun N-terminal kinase signaling pathways. Downstream NFATc1 and c-Fos expression were also substantially suppressed by PP2A inhibition or knockdown. Our findings support the importance of PP2A during osteoclastogenesis, identifying PP2A as a novel target for treating particle-induced or other osteoclast-mediated bone resorption diseases. STATEMENT OF SIGNIFICANCE Excessive osteoclast activation disrupts bone homeostasis and leads to osteoclast-mediated bone resorption diseases, such as peri-prosthetic osteolysis, regarded as the primary reason for implant failure and revision surgery. Here, we firstly demonstrated protein phosphatase 2A (PP2A), a major serine-threonine phosphatase, was highly expressed in human periprosthetic interface membranes with aseptic loosening and murine osteolysis model. Moreover, PP2A inhibition effectively alleviated titanium particle-induced bone destruction and decreased osteoclast numbers. Meanwhile, a PP2A selective inhibitor or PP2A siRNA suppressed osteoclastogenesis and alleviated osteoclastic resorption by inhibiting the nuclear factor-кB and c-Jun N-terminal kinase signaling pathways. Thus, PP2A is involved in osteoclastogenesis and could be a promising target for regulating bone homeostasis and osteolytic responses.
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Affiliation(s)
- Liangliang Wang
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Xiaobin Guo
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Wei Zhou
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Yayun Ding
- Department of Pathology, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Jiawei Shi
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Xiexing Wu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Yu Liu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Yaozeng Xu
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China.
| | - Huilin Yang
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China.
| | - Dechun Geng
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou 215006, China.
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Chu Y, Zhao Z, Sant DW, Zhu G, Greenblatt SM, Liu L, Wang J, Cao Z, Tho JC, Chen S, Liu X, Zhang P, Maciejewski JP, Nimer S, Wang G, Yuan W, Yang FC, Xu M. Tet2 Regulates Osteoclast Differentiation by Interacting with Runx1 and Maintaining Genomic 5-Hydroxymethylcytosine (5hmC). GENOMICS, PROTEOMICS & BIOINFORMATICS 2018; 16:172-186. [PMID: 29908294 PMCID: PMC6076382 DOI: 10.1016/j.gpb.2018.04.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/29/2018] [Accepted: 04/16/2018] [Indexed: 12/13/2022]
Abstract
As a dioxygenase, Ten-Eleven Translocation 2 (TET2) catalyzes subsequent steps of 5-methylcytosine (5mC) oxidation. TET2 plays a critical role in the self-renewal, proliferation, and differentiation of hematopoietic stem cells, but its impact on mature hematopoietic cells is not well-characterized. Here we show that Tet2 plays an essential role in osteoclastogenesis. Deletion of Tet2 impairs the differentiation of osteoclast precursor cells (macrophages) and their maturation into bone-resorbing osteoclasts in vitro. Furthermore, Tet2-/- mice exhibit mild osteopetrosis, accompanied by decreased number of osteoclasts in vivo. Tet2 loss in macrophages results in the altered expression of a set of genes implicated in osteoclast differentiation, such as Cebpa, Mafb, and Nfkbiz. Tet2 deletion also leads to a genome-wide alteration in the level of 5-hydroxymethylcytosine (5hmC) and altered expression of a specific subset of macrophage genes associated with osteoclast differentiation. Furthermore, Tet2 interacts with Runx1 and negatively modulates its transcriptional activity. Our studies demonstrate a novel molecular mechanism controlling osteoclast differentiation and function by Tet2, that is, through interactions with Runx1 and the maintenance of genomic 5hmC. Targeting Tet2 and its pathway could be a potential therapeutic strategy for the prevention and treatment of abnormal bone mass caused by the deregulation of osteoclast activities.
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Affiliation(s)
- Yajing Chu
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China
| | - Zhigang Zhao
- Department of Hematology and Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China.
| | - David Wayne Sant
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Human Genetics, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Ganqian Zhu
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Sarah M Greenblatt
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Medicine, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Lin Liu
- Department of Hematology and Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China
| | - Jinhuan Wang
- Department of Oncology, The Second Affiliated Hospital of Tianjin Medical University, Tianjin 300211, China
| | - Zeng Cao
- Department of Hematology and Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China
| | - Jeanette Cheng Tho
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Shi Chen
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Xiaochen Liu
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Peng Zhang
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Jaroslaw P Maciejewski
- Department of Translational Hematology and Oncology Research, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Stephen Nimer
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Medicine, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Gaofeng Wang
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Human Genetics, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Weiping Yuan
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China
| | - Feng-Chun Yang
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
| | - Mingjiang Xu
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136, USA; Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
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Fu J, Nogueira SV, Drongelen VV, Coit P, Ling S, Rosloniec EF, Sawalha AH, Holoshitz J. Shared epitope-aryl hydrocarbon receptor crosstalk underlies the mechanism of gene-environment interaction in autoimmune arthritis. Proc Natl Acad Sci U S A 2018; 115:4755-4760. [PMID: 29666259 PMCID: PMC5939100 DOI: 10.1073/pnas.1722124115] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The susceptibility to autoimmune diseases is affected by genetic and environmental factors. In rheumatoid arthritis (RA), the shared epitope (SE), a five-amino acid sequence motif encoded by RA-associated HLA-DRB1 alleles, is the single most significant genetic risk factor. The risk conferred by the SE is increased in a multiplicative way by exposure to various environmental pollutants, such as cigarette smoke. The mechanism of this synergistic interaction is unknown. It is worth noting that the SE has recently been found to act as a signal transduction ligand that facilitates differentiation of Th17 cells and osteoclasts in vitro and in vivo. Intriguingly, the aryl hydrocarbon receptor (AhR), a transcription factor that mediates the xenobiotic effects of many pollutants, including tobacco combustion products, has been found to activate similar biologic effects. Prompted by these similarities, we sought to determine whether the SE and AhR signaling pathways interact in autoimmune arthritis. Here we uncovered a nuclear factor kappa B-mediated synergistic interaction between the SE and AhR pathways that leads to markedly enhanced osteoclast differentiation and Th17 polarization in vitro. Administration of AhR pathway agonists to transgenic mice carrying human SE-coding alleles resulted in a robust increase in arthritis severity, bone destruction, overabundance of osteoclasts, and IL17-expressing cells in the inflamed joints and draining lymph nodes of arthritic mice. Thus, this study identifies a previously unrecognized mechanism of gene-environment interaction that could provide insights into the well-described but poorly understood amplification of the genetic risk for RA upon exposure to environmental pollutants.
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Affiliation(s)
- Jiaqi Fu
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Sarah V Nogueira
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | | | - Patrick Coit
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Song Ling
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Edward F Rosloniec
- Veterans Affairs Medical Center and Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163
| | - Amr H Sawalha
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Joseph Holoshitz
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109;
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Chen W, Zhu G, Jules J, Nguyen D, Li YP. Monocyte-Specific Knockout of C/ebpα Results in Osteopetrosis Phenotype, Blocks Bone Loss in Ovariectomized Mice, and Reveals an Important Function of C/ebpα in Osteoclast Differentiation and Function. J Bone Miner Res 2018; 33:691-703. [PMID: 29149533 PMCID: PMC6240465 DOI: 10.1002/jbmr.3342] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 11/09/2017] [Accepted: 11/11/2017] [Indexed: 01/26/2023]
Abstract
CCAAT/enhancer-binding protein α (C/ebpα) is critical for osteoclastogenesis by regulating osteoclast (OC) lineage commitment and is also important for OC differentiation and function in vitro. However, the role of C/ebpα in postnatal skeletal development has not been reported owing to lethality in C/ebpα-/- mice from hypoglycemia within 8 hours after birth. Herein, we generated conditional knockout mice by deleting the C/ebpα gene in monocyte via LysM-Cre to examine its role in OC differentiation and function. C/ebpαf/f LysM-Cre mice exhibited postnatal osteopetrosis due to impaired osteoclastogenesis, OC lineage priming defects, as well as defective OC differentiation and activity. Furthermore, our ex vivo analysis demonstrated that C/ebpα conditional deletion significantly reduced OC differentiation, maturation, and activity while mildly repressing macrophage development. At the molecular level, C/ebpα deficiency significantly suppresses the expressions of OC genes associated with early stages of osteoclastogenesis as well as genes associated with OC differentiation and activity. We also identified numerous C/ebpα critical cis-regulatory elements on the Cathepsin K promoter that allow C/ebpα to significantly upregulate Cathepsin K expression during OC differentiation and activity. In pathologically induced mouse model of osteoporosis, C/ebpα deficiency can protect mice against ovariectomy-induced bone loss, uncovering a central role for C/ebpα in osteolytic diseases. Collectively, our findings have further established C/ebpα as a promising therapeutic target for bone loss by concurrently targeting OC lineage priming, differentiation, and activity. © 2017 American Society for Bone and Mineral Research.
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Affiliation(s)
- Wei Chen
- Department of Pathology, University of Alabama, Birmingham, AL 35294
| | - Guochun Zhu
- Department of Pathology, University of Alabama, Birmingham, AL 35294
| | - Joel Jules
- Department of Pathology, University of Alabama, Birmingham, AL 35294
| | - Diep Nguyen
- Department of Pathology, University of Alabama, Birmingham, AL 35294
| | - Yi-Ping Li
- Department of Pathology, University of Alabama, Birmingham, AL 35294
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Seike M, Omatsu Y, Watanabe H, Kondoh G, Nagasawa T. Stem cell niche-specific Ebf3 maintains the bone marrow cavity. Genes Dev 2018; 32:359-372. [PMID: 29563184 PMCID: PMC5900710 DOI: 10.1101/gad.311068.117] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 02/28/2018] [Indexed: 01/01/2023]
Abstract
Bone marrow is the tissue filling the space between bone surfaces. Hematopoietic stem cells (HSCs) are maintained by special microenvironments known as niches within bone marrow cavities. Mesenchymal cells, termed CXC chemokine ligand 12 (CXCL12)-abundant reticular (CAR) cells or leptin receptor-positive (LepR+) cells, are a major cellular component of HSC niches that gives rise to osteoblasts in bone marrow. However, it remains unclear how osteogenesis is prevented in most CAR/LepR+ cells to maintain HSC niches and marrow cavities. Here, using lineage tracing, we found that the transcription factor early B-cell factor 3 (Ebf3) is preferentially expressed in CAR/LepR+ cells and that Ebf3-expressing cells are self-renewing mesenchymal stem cells in adult marrow. When Ebf3 is deleted in CAR/LepR+ cells, HSC niche function is severely impaired, and bone marrow is osteosclerotic with increased bone in aged mice. In mice lacking Ebf1 and Ebf3, CAR/LepR+ cells exhibiting a normal morphology are abundantly present, but their niche function is markedly impaired with depleted HSCs in infant marrow. Subsequently, the mutants become progressively more osteosclerotic, leading to the complete occlusion of marrow cavities in early adulthood. CAR/LepR+ cells differentiate into bone-producing cells with reduced HSC niche factor expression in the absence of Ebf1/Ebf3 Thus, HSC cellular niches express Ebf3 that is required to create HSC niches, to inhibit their osteoblast differentiation, and to maintain spaces for HSCs.
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Affiliation(s)
- Masanari Seike
- Laboratory of Stem Cell Biology and Developmental Immunology, Graduate School of Frontier Biosciences, Graduate School of Medicine, Immunology Frontier Research Center, World Premier International Research Center (WPI), Osaka University, Osaka 565-0871, Japan
| | - Yoshiki Omatsu
- Laboratory of Stem Cell Biology and Developmental Immunology, Graduate School of Frontier Biosciences, Graduate School of Medicine, Immunology Frontier Research Center, World Premier International Research Center (WPI), Osaka University, Osaka 565-0871, Japan
| | - Hitomi Watanabe
- Laboratory of Integrative Biological Science and Animal Experiments for Regeneration, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| | - Gen Kondoh
- Laboratory of Integrative Biological Science and Animal Experiments for Regeneration, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| | - Takashi Nagasawa
- Laboratory of Stem Cell Biology and Developmental Immunology, Graduate School of Frontier Biosciences, Graduate School of Medicine, Immunology Frontier Research Center, World Premier International Research Center (WPI), Osaka University, Osaka 565-0871, Japan
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Chen W, Zhu G, Tang J, Zhou HD, Li YP. C/ebpα controls osteoclast terminal differentiation, activation, function, and postnatal bone homeostasis through direct regulation of Nfatc1. J Pathol 2018; 244:271-282. [PMID: 29083488 PMCID: PMC6240466 DOI: 10.1002/path.5001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 10/18/2017] [Accepted: 10/19/2017] [Indexed: 12/18/2022]
Abstract
Osteoclast lineage commitment and differentiation have been studied extensively, although the mechanism by which transcription factor(s) control osteoclast terminal differentiation, activation, and function remains unclear. CCAAT/enhancer-binding protein α (C/ebpα) has been reported to be a key regulator of osteoclast cell lineage commitment, yet C/ebpα's roles in osteoclast terminal differentiation, activation and function, and bone homeostasis, under physiological or pathological conditions, have not been studied because newborn C/ebpα-null mice die within several hours after birth. Furthermore, the function of C/ebpα in osteoclast terminal differentiation, activation, and function is largely unknown. Herein, we generated and analyzed an osteoclast-specific C/ebpα conditional knockout (CKO) mouse model via Ctsk-Cre mice and found that C/ebpα-deficient mice exhibited a severe osteopetrosis phenotype due to impaired osteoclast terminal differentiation, activation, and function, including mildly reduced osteoclast number, impaired osteoclast polarization, actin formation, and bone resorption, which demonstrated the novel function of C/ebpα in cell function and terminal differentiation. Interestingly, C/ebpα deficiency did not affect bone formation or monocyte/macrophage development. Our results further demonstrated that C/ebpα deficiency suppressed the expression of osteoclast functional genes, e.g. encoding cathepsin K (Ctsk), Atp6i (Tcirg1), and osteoclast regulator genes, e.g. encoding c-fos (Fos), and nuclear factor of activated T-cells 1 (Nfatc1), while having no effect on Pu.1 (Spi1) expression. Promoter activity mapping and ChIP assay defined the critical cis-regulatory element (CCRE) in the promoter region of Nfatc1, and also showed that the CCREs were directly associated with C/ebpα, which enhanced the promoter's activity. The deficiency of C/ebpα in osteoclasts completely blocked ovariectomy-induced bone loss, indicating that C/ebpα is a promising new target for the treatment of osteolytic diseases. Copyright © 2017 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Wei Chen
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham , Alabama 35294-2182, United States of America,Correspondence to: Yi-Ping Li, Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham, AL 35294-2182, USA, Tel: 205-975-2606, Fax: 205-975-4919, and Wei Chen, Department of Pathology, University of Alabama at Birmingham, SHEL 815, 1825 University Blvd, Birmingham, AL 35294-2182, USA, Tel: 205-975-2605, Fax: 205-975-4919,
| | - Guochun Zhu
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham , Alabama 35294-2182, United States of America
| | - Jun Tang
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham , Alabama 35294-2182, United States of America
| | - Hou-De Zhou
- Department of Metabolism & Endocrinology, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital, Central South University, ChangSha, Hunan, China
| | - Yi-Ping Li
- Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham , Alabama 35294-2182, United States of America,Correspondence to: Yi-Ping Li, Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham, AL 35294-2182, USA, Tel: 205-975-2606, Fax: 205-975-4919, and Wei Chen, Department of Pathology, University of Alabama at Birmingham, SHEL 815, 1825 University Blvd, Birmingham, AL 35294-2182, USA, Tel: 205-975-2605, Fax: 205-975-4919,
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Jules J, Li YP, Chen W. C/EBPα and PU.1 exhibit different responses to RANK signaling for osteoclastogenesis. Bone 2018; 107:104-114. [PMID: 29032174 PMCID: PMC6240464 DOI: 10.1016/j.bone.2017.05.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 04/14/2017] [Accepted: 05/08/2017] [Indexed: 11/23/2022]
Abstract
The transcription factors C/EBPα and PU.1 are upregulated by RANKL through activation of its receptor RANK during osteoclastogenesis and are critical for osteoclast differentiation. Herein we investigated the mechanisms underlying how C/EBPα and PU.1 regulate osteoclast differentiation in response to RANK signaling. We showed that C/EBPα or PU.1 overexpression could initiate osteoclastogenesis and upregulate the expressions of the osteoclast genes encoding the nuclear factor of activated T-cells, C1, cathepsin K, and tartrate-resistant acid phosphatase independently of RANKL. However, while PU.1 upregulated C/EBPα, C/EBPα could not upregulate PU.1. RANK has a unique cytoplasmic domain, 535IVVY538 motif, which is crucial for osteoclast differentiation. We demonstrated that mutational inactivation of RANK IVVY motif blocked osteoclast differentiation and significantly attenuated C/EBPα, but not PU.1, expression, indicating that RANK-IVVY-induced signaling is dispensable to PU.1 upregulation during osteoclastogenesis. However, C/EBPα or PU.1 overexpression failed to promote osteoclastogenesis in cells expressing mutated RANK IVVY motif. We noted that RANK-IVVY-motif inactivation significantly repressed osteoclast genes as compared with a vector control, suggesting that IVVY motif might also negatively regulate osteoclast inhibitors during osteoclastogenesis. Consistently, IVVY-motif inactivation triggered upregulation of RBP-J, a potent osteoclast inhibitor, during osteoclastogenesis. Notably, C/EBPα or PU.1 overexpression in cells expressing mutated RANK IVVY motif failed to control the deregulated RBP-J expression, resulting in repression of osteoclast genes. Accordingly, RBP-J silencing in the mutant cells rescued osteoclastogenesis with C/EBPα or PU.1 overexpression. In conclusion, we revealed that while PU.1 and C/EBPα are critical for osteoclastogenesis, they respond differently to RANKL-induced activation of RANK IVVY motif.
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Affiliation(s)
- Joel Jules
- Department of Pathology, University of Alabama, Birmingham, AL 35294, United States
| | - Yi-Ping Li
- Department of Pathology, University of Alabama, Birmingham, AL 35294, United States.
| | - Wei Chen
- Department of Pathology, University of Alabama, Birmingham, AL 35294, United States.
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Jules J, Chen W, Feng X, Li YP. C/EBPα transcription factor is regulated by the RANK cytoplasmic 535IVVY 538 motif and stimulates osteoclastogenesis more strongly than c-Fos. J Biol Chem 2018; 293:1480-1492. [PMID: 29122885 PMCID: PMC5787821 DOI: 10.1074/jbc.m116.736009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 10/21/2017] [Indexed: 01/18/2023] Open
Abstract
Binding of receptor activator of NF-κB ligand (RANKL) to its receptor RANK on osteoclast (OC) precursors up-regulates c-Fos and CCAAT/enhancer-binding protein-α (C/EBPα), two critical OC transcription factors. However, the effects of c-Fos and C/EBPα on osteoclastogenesis have not been compared. Herein, we demonstrate that overexpression of c-Fos or C/EBPα in OC precursors up-regulates OC genes and initiates osteoclastogenesis independently of RANKL. However, although C/EBPα up-regulated c-Fos, c-Fos failed to up-regulate C/EBPα in OC precursors. Consistently, C/EBPα overexpression more strongly promoted OC differentiation than did c-Fos overexpression. RANK has a cytoplasmic 535IVVY538 (IVVY) motif that is essential for osteoclastogenesis, and we found that mutation of the IVVY motif blocked OC differentiation by partly inhibiting expression of C/EBPα but not expression of c-Fos. We therefore hypothesized that C/EBPα overexpression might rescue osteoclastogenesis in cells expressing the mutated IVVY motif. However, overexpression of C/EBPα or c-Fos failed to stimulate osteoclastogenesis in the mutant cells. Notably, the IVVY motif mutation abrogated OC gene expression compared with a vector control, suggesting that the IVVY motif might counteract OC inhibitors during osteoclastogenesis. Consistently, the IVVY motif mutant triggered up-regulation of recombinant recognition sequence-binding protein at the Jκ site (RBP-J) protein, a potent OC inhibitor. Mechanistically, C/EBPα or c-Fos overexpression in the mutant cells failed to control the up-regulated RBP-J expression, leading to suppression of OC genes. Accordingly, RBP-J silencing in the mutant cells rescued osteoclastogenesis with C/EBPα or c-Fos overexpression with C/EBPα exhibiting a stronger osteoclastogenic effect. Collectively, our findings indicate that C/EBPα is a stronger inducer of OC differentiation than c-Fos, partly via C/EBPα regulation by the RANK 535IVVY538 motif.
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Affiliation(s)
- Joel Jules
- From the Department of Pathology, University of Alabama, Birmingham, Alabama 35294
| | - Wei Chen
- From the Department of Pathology, University of Alabama, Birmingham, Alabama 35294
| | - Xu Feng
- From the Department of Pathology, University of Alabama, Birmingham, Alabama 35294
| | - Yi-Ping Li
- From the Department of Pathology, University of Alabama, Birmingham, Alabama 35294
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Jang J, Jung Y, Chae S, Cho SH, Yoon M, Yang H, Shin SS, Yoon Y. Gangjihwan, a polyherbal composition, inhibits fat accumulation through the modulation of lipogenic transcription factors SREBP1C, PPARγ and C/EBPα. JOURNAL OF ETHNOPHARMACOLOGY 2018; 210:10-22. [PMID: 28842339 DOI: 10.1016/j.jep.2017.08.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 08/20/2017] [Accepted: 08/20/2017] [Indexed: 06/07/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Gangjihwan (DF) which is composed of Ephedra intermedia, Lithospermum erythrorhizon, and Rheum palmatum has been used for the treatment of obesity in traditional medical clinics in Korea. AIM OF THE STUDY This study was conducted to standardize DF and elucidate its mechanism of action for inhibiting fat accumulation in adipocytes and adipose tissues. MATERIALS AND METHODS The herbal ingredients of DF were extracted in water, 30% ethanol or 70% ethanol and freeze-dried followed by HPLC analyses. 3T3-L1 adipocytes and high-fat diet-induced obese mice were treated with each of the three DF preparations. Messenger RNA and protein expression levels were measured by real-time qPCR and Western blotting. RNA-Seq analyses were conducted to examine the effects of DF treatment on whole transcriptome of adipocyte. RESULTS (-)-Ephedrine and (+)-pseudoephedrine from E. intermedia, aloe-emodin and chrysophanol from R. palmatum and shikonin from L. erythrorhizon were identified as phytochemical components of DF. DF caused dose-dependent inhibition of fat accumulation in 3T3-L1 adipocytes. It also significantly reduced adipose tissue mass and adipocyte size in high-fat diet-induced obese mice. DF was found to down-regulate the expressions of the lipogenic transcription factors such as sterol regulatory element binding protein 1C (SREBP1C), peroxisome proliferator activated receptor gamma (PPARγ), and CCAAT/enhancer binding protein alpha (C/EBPα). Among the three preparations of DF, the 70% ethanol extract was the most effective. RNA-Seq analyses showed that DF treatment decreased the expression levels of up-regulators and increased those of down-regulators of lipogenic transcription factors. CONCLUSIONS DF preparations, among which 70% ethanol extract was the most effective, reduced fat accumulation in 3T3-L1 adipocytes and high-fat diet-induced obese mice through the down-regulation of lipogenic transcription factors SREBP1C, PPARγ and C/EBPα.
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Affiliation(s)
- Jaewoong Jang
- Department of Microbiology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Yoonju Jung
- Department of Microbiology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seyeon Chae
- Department of Microbiology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Soo Hyun Cho
- Department of Family Medicine, College of Medicine, Chung-Ang University Hospital, Seoul 06973, Republic of Korea
| | - Michung Yoon
- Department of Biomedical Engineering, Mokwon University, Daejon 35349, Republic of Korea
| | - Heejung Yang
- College of Pharmacy, Kangwon National University, Chuncheon 24341, Republic of Korea.
| | - Soon Shik Shin
- Department of Formula Sciences and Research Center of Korean Medicine for Diabetes and Obesity, College of Korean Medicine, Dong-eui University, Busan 47227, Republic of Korea.
| | - Yoosik Yoon
- Department of Microbiology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea.
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Kurotaki D, Sasaki H, Tamura T. Transcriptional control of monocyte and macrophage development. Int Immunol 2018; 29:97-107. [PMID: 28379391 DOI: 10.1093/intimm/dxx016] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 03/19/2017] [Indexed: 12/12/2022] Open
Abstract
Monocytes and macrophages play critical roles in immune responses, tissue homeostasis and disease progression. There are a number of functionally and phenotypically distinct subpopulations throughout the body. However, the mechanisms by which macrophage and monocyte heterogeneity is established remain unclear. Recent studies have suggested that most tissue-resident macrophages originate from fetal progenitors but not from hematopoietic stem cells, whereas some subpopulations are derived from adult monocytes. In addition, transcription factors specifically required for the development of each subpopulation have been identified. Interestingly, local environmental factors such as heme, retinoic acid and RANKL induce the expression and/or activation of tissue-specific transcription factors, thereby controlling transcriptional programs specific for the subpopulations. Thus, distinct differentiation pathways and local microenvironments appear to contribute to the determination of macrophage transcriptional identities. In this review, we highlight recent advances in our knowledge of the transcriptional control of macrophage and monocyte development.
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Affiliation(s)
- Daisuke Kurotaki
- Department of Immunology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Haruka Sasaki
- Department of Immunology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan
| | - Tomohiko Tamura
- Department of Immunology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan
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Okamoto K, Nakashima T, Shinohara M, Negishi-Koga T, Komatsu N, Terashima A, Sawa S, Nitta T, Takayanagi H. Osteoimmunology: The Conceptual Framework Unifying the Immune and Skeletal Systems. Physiol Rev 2017; 97:1295-1349. [DOI: 10.1152/physrev.00036.2016] [Citation(s) in RCA: 241] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 03/29/2017] [Accepted: 04/04/2017] [Indexed: 12/13/2022] Open
Abstract
The immune and skeletal systems share a variety of molecules, including cytokines, chemokines, hormones, receptors, and transcription factors. Bone cells interact with immune cells under physiological and pathological conditions. Osteoimmunology was created as a new interdisciplinary field in large part to highlight the shared molecules and reciprocal interactions between the two systems in both heath and disease. Receptor activator of NF-κB ligand (RANKL) plays an essential role not only in the development of immune organs and bones, but also in autoimmune diseases affecting bone, thus effectively comprising the molecule that links the two systems. Here we review the function, gene regulation, and signal transduction of osteoimmune molecules, including RANKL, in the context of osteoclastogenesis as well as multiple other regulatory functions. Osteoimmunology has become indispensable for understanding the pathogenesis of a number of diseases such as rheumatoid arthritis (RA). We review the various osteoimmune pathologies, including the bone destruction in RA, in which pathogenic helper T cell subsets [such as IL-17-expressing helper T (Th17) cells] induce bone erosion through aberrant RANKL expression. We also focus on cellular interactions and the identification of the communication factors in the bone marrow, discussing the contribution of bone cells to the maintenance and regulation of hematopoietic stem and progenitors cells. Thus the time has come for a basic reappraisal of the framework for understanding both the immune and bone systems. The concept of a unified osteoimmune system will be absolutely indispensable for basic and translational approaches to diseases related to bone and/or the immune system.
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Affiliation(s)
- Kazuo Okamoto
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Tomoki Nakashima
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Masahiro Shinohara
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Takako Negishi-Koga
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Noriko Komatsu
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Asuka Terashima
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Shinichiro Sawa
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Takeshi Nitta
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
| | - Hiroshi Takayanagi
- Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan; Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Tokyo, Japan; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST), Tokyo, Japan
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Wu M, Wang Y, Shao JZ, Wang J, Chen W, Li YP. Cbfβ governs osteoblast-adipocyte lineage commitment through enhancing β-catenin signaling and suppressing adipogenesis gene expression. Proc Natl Acad Sci U S A 2017; 114:10119-10124. [PMID: 28864530 PMCID: PMC5617241 DOI: 10.1073/pnas.1619294114] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The mechanism underlying how transcription factors regulate mesenchymal stem cell lineage commitment remains unclear. To determine the role of core-binding factor subunit beta (Cbfβ) in osteoblast lineage commitment, we generated three mouse models by deleting Cbfβ at different osteoblast lineage stages. We demonstrated that the Cbfβf/fPrx1-Cre, Cbfβf/fCol2α1-Cre, and Cbfβf/fOsx-Cre mice exhibited severe osteoporosis with substantial accumulation of marrow adipocytes resembling aged bone from enhanced adipogenesis, indicating that mesenchymal stem cells and osteoblasts can be programed and reprogramed, respectively, into adipocytes. Consistently, Cbfβ-deficient calvarial cells and bone marrow mesenchymal stem cells displayed strong adipogenic potential, with 5- to ∼70-fold increased adipocyte gene expression, which can be rescued by Cbfβ overexpression. Canonical Wnt signaling was impeded in the Cbfβ-deficient cells, with ∼80% decrease of Wnt10b expression. Accordingly, ChIP and luciferase assays demonstrated that Cbfβ/RUNX2 binds to Wnt10b promoter driving Wnt10b expression. Furthermore, Wnt3a suppressed adipogenesis but did not rescue osteoblastogenesis in Cbfβ-deficient cells. Notably, mixing culture of Cbfβ-deficient with normal cells demonstrates that Cbfβ functions not only through WNT paracrine pathway but also through endogenous signaling. Further analysis shows that Cbfβ/RUNX2 inhibits c/ebpα expression at transcriptional level. Our results show that, besides its osteogenic role, Cbfβ governs osteoblast-adipocyte lineage commitment both cell nonautonomously through enhancing β-catenin signaling and cell autonomously through suppressing adipogenesis gene expression to maintain osteoblast lineage commitment, indicating Cbfβ may be a therapeutic target for osteoporosis.
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Affiliation(s)
- Mengrui Wu
- Institute of Genetics, Life Science College, Zhejiang University, Hangzhou 310058, People's Republic of China
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Yiping Wang
- Institute of Genetics, Life Science College, Zhejiang University, Hangzhou 310058, People's Republic of China
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Jian-Zhong Shao
- Institute of Genetics, Life Science College, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Jue Wang
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Wei Chen
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Yi-Ping Li
- Institute of Genetics, Life Science College, Zhejiang University, Hangzhou 310058, People's Republic of China;
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294
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Ntougkos E, Chouvardas P, Roumelioti F, Ospelt C, Frank-Bertoncelj M, Filer A, Buckley CD, Gay S, Nikolaou C, Kollias G. Genomic Responses of Mouse Synovial Fibroblasts During Tumor Necrosis Factor-Driven Arthritogenesis Greatly Mimic Those in Human Rheumatoid Arthritis. Arthritis Rheumatol 2017; 69:1588-1600. [PMID: 28409894 DOI: 10.1002/art.40128] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 04/11/2017] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Aberrant activation of synovial fibroblasts is a key determinant in the pathogenesis of rheumatoid arthritis (RA). The aims of this study were to produce a map of gene expression and epigenetic changes occurring in this cell type during disease progression in the human tumor necrosis factor (TNF)-transgenic model of arthritis and to identify commonalities with human synovial fibroblasts. METHODS We used deep sequencing to probe the transcriptome, the methylome, and the chromatin landscape of cultured mouse arthritogenic synovial fibroblasts at 3 stages of disease, as well as synovial fibroblasts stimulated with human TNF. We performed bioinformatics analyses at the gene, pathway, and network levels, compared mouse and human data, and validated selected genes in both species. RESULTS We found that synovial fibroblast arthritogenicity was reflected in distinct dynamic patterns of transcriptional dysregulation, which was especially enriched in pathways of the innate immune response and mesenchymal differentiation. A functionally representative subset of these changes was associated with methylation, mostly in gene bodies. The arthritogenic state involved highly active promoters, which were marked by histone H3K4 trimethylation. There was significant overlap between the mouse and human data at the level of dysregulated genes and to an even greater extent at the level of pathways. CONCLUSION This study is the first systematic examination of the pathogenic changes that occur in mouse synovial fibroblasts during progressive TNF-driven arthritogenesis. Significant correlations with the respective human RA synovial fibroblast data further validate the human TNF-transgenic mouse as a reliable model of the human disease. The resource of data generated in this work may serve as a framework for the discovery of novel pathogenic mechanisms and disease biomarkers.
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Affiliation(s)
| | - Panagiotis Chouvardas
- BSRC Alexander Fleming, Vari, Greece, and National and Kapodistrian University of Athens, Athens, Greece
| | - Fani Roumelioti
- BSRC Alexander Fleming, Vari, Greece, and National and Kapodistrian University of Athens, Athens, Greece
| | | | | | | | | | - Steffen Gay
- University Hospital of Zurich, Zurich, Switzerland
| | | | - George Kollias
- BSRC Alexander Fleming, Vari, Greece, and National and Kapodistrian University of Athens, Athens, Greece
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Huang M, Hayward JJ, Corey E, Garrison SJ, Wagner GR, Krotscheck U, Hayashi K, Schweitzer PA, Lust G, Boyko AR, Todhunter RJ. A novel iterative mixed model to remap three complex orthopedic traits in dogs. PLoS One 2017; 12:e0176932. [PMID: 28614352 PMCID: PMC5470659 DOI: 10.1371/journal.pone.0176932] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 04/19/2017] [Indexed: 12/31/2022] Open
Abstract
Hip dysplasia (HD), elbow dysplasia (ED), and rupture of the cranial (anterior) cruciate ligament (RCCL) are the most common complex orthopedic traits of dogs and all result in debilitating osteoarthritis. We reanalyzed previously reported data: the Norberg angle (a quantitative measure of HD) in 921 dogs, ED in 113 cases and 633 controls, and RCCL in 271 cases and 399 controls and their genotypes at ~185,000 single nucleotide polymorphisms. A novel fixed and random model with a circulating probability unification (FarmCPU) function, with marker-based principal components and a kinship matrix to correct for population stratification, was used. A Bonferroni correction at p<0.01 resulted in a P< 6.96 ×10-8. Six loci were identified; three for HD and three for RCCL. An associated locus at CFA28:34,369,342 for HD was described previously in the same dogs using a conventional mixed model. No loci were identified for RCCL in the previous report but the two loci for ED in the previous report did not reach genome-wide significance using the FarmCPU model. These results were supported by simulation which demonstrated that the FarmCPU held no power advantage over the linear mixed model for the ED sample but provided additional power for the HD and RCCL samples. Candidate genes for HD and RCCL are discussed. When using FarmCPU software, we recommend a resampling test, that a positive control be used to determine the optimum pseudo quantitative trait nucleotide-based covariate structure of the model, and a negative control be used consisting of permutation testing and the identical resampling test as for the non-permuted phenotypes.
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Affiliation(s)
- Meng Huang
- Department of Crop and Soil Science, Washington State University, Pullman, Washington, United States of America
| | - Jessica J. Hayward
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Elizabeth Corey
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Susan J. Garrison
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Gabriela R. Wagner
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Ursula Krotscheck
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Kei Hayashi
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Peter A. Schweitzer
- Sequencing Core, Biotechnology Resource Center, Cornell University, Ithaca, New York, United States of America
| | - George Lust
- Baker Institute for Animal Health, Cornell University, Ithaca, New York, United States of America
| | - Adam R. Boyko
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Chief Scientific Officer of Embark Veterinary Inc., Austin, Texas, United States of America
| | - Rory J. Todhunter
- Cornell Veterinary Biobank, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
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Gα13 negatively controls osteoclastogenesis through inhibition of the Akt-GSK3β-NFATc1 signalling pathway. Nat Commun 2017; 8:13700. [PMID: 28102206 PMCID: PMC5253683 DOI: 10.1038/ncomms13700] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 10/25/2016] [Indexed: 01/26/2023] Open
Abstract
Many positive signalling pathways of osteoclastogenesis have been characterized, but negative signalling pathways are less well studied. Here we show by microarray and RNAi that guanine nucleotide-binding protein subunit α13 (Gα13) is a negative regulator of osteoclastogenesis. Osteoclast-lineage-specific Gna13 conditional knockout mice have a severe osteoporosis phenotype. Gna13-deficiency triggers a drastic increase in both osteoclast number and activity (hyper-activation), mechanistically through decreased RhoA activity and enhanced Akt/GSK3β/NFATc1 signalling. Consistently, Akt inhibition or RhoA activation rescues hyper-activation of Gna13-deficient osteoclasts, and RhoA inhibition mimics the osteoclast hyperactivation resulting from Gna13-deficiency. Notably, Gα13 gain-of-function inhibits Akt activation and osteoclastogenesis, and protects mice from pathological bone loss in disease models. Collectively, we reveal that Gα13 is a master endogenous negative switch for osteoclastogenesis through regulation of the RhoA/Akt/GSK3β/NFATc1 signalling pathway, and that manipulating Gα13 activity might be a therapeutic strategy for bone diseases.
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MiR-124 contributes to M2 polarization of microglia and confers brain inflammatory protection via the C/EBP-α pathway in intracerebral hemorrhage. Immunol Lett 2016; 182:1-11. [PMID: 28025043 DOI: 10.1016/j.imlet.2016.12.003] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/16/2016] [Accepted: 12/22/2016] [Indexed: 11/22/2022]
Abstract
Microglia mediated inflammation contributes to intracerebral hemorrhage (ICH) induced secondary injury. Activated microglia has dual functions as pro-inflammatory (M1) and anti-inflammatory (M2) factors in brain injury and repair. MiR-124 is a potent anti-inflammatory agent which affects microglia after brain injury. However, the potential of modulating the M1/M2 polarization of microglia after ICH has not been reported. In this experiment, we detected the effect of miR-124 on the M1/M2 polarization state. In addition, the ability miR-124 to subsequently impacted neurological deficit and cerebral water content of ICH mice were studied. Furthermore, the relationship between miR-124 and C/EBP-α target was detected. We found that miR-124 significantly increased in M2-polarized microglia. Transduction of miR-124 mimics decreased proinflammatory cytokine levels. A coculture model of microglia and neuron indicated that M2-polarized microglia protected neuron damage. Furthermore, miR-124 banded to the 3-untranslated region of C/EBP-α and downregulated its protein levels. In vivo, infusion of miR-124 decreased brain levels of C/EBP-α and significantly reduced brain injury in ICH mice. Thus, miR-124 ameliorated ICH-induced inflammatory injury by modulating microglia polarization toward the M2 phenotype via C/EBP-α. MiR-124 regulatory mechanisms also might represent new therapeutic strategy in ICH.
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Abstract
Macrophages are found in all tissues and regulate tissue morphogenesis during development through trophic and scavenger functions. The colony stimulating factor-1 (CSF-1) receptor (CSF-1R) is the major regulator of tissue macrophage development and maintenance. In combination with receptor activator of nuclear factor κB (RANK), the CSF-1R also regulates the differentiation of the bone-resorbing osteoclast and controls bone remodeling during embryonic and early postnatal development. CSF-1R-regulated macrophages play trophic and remodeling roles in development. Outside the mononuclear phagocytic system, the CSF-1R directly regulates neuronal survival and differentiation, the development of intestinal Paneth cells and of preimplantation embryos, as well as trophoblast innate immune function. Consistent with the pleiotropic roles of the receptor during development, CSF-1R deficiency in most mouse strains causes embryonic or perinatal death and the surviving mice exhibit multiple developmental and functional deficits. The CSF-1R is activated by two dimeric glycoprotein ligands, CSF-1, and interleukin-34 (IL-34). Homozygous Csf1-null mutations phenocopy most of the deficits of Csf1r-null mice. In contrast, Il34-null mice have no gross phenotype, except for decreased numbers of Langerhans cells and microglia, indicating that CSF-1 plays the major developmental role. Homozygous inactivating mutations of the Csf1r or its ligands have not been reported in man. However, heterozygous inactivating mutations in the Csf1r lead to a dominantly inherited adult-onset progressive dementia, highlighting the importance of CSF-1R signaling in the brain.
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Affiliation(s)
- Violeta Chitu
- Albert Einstein College of Medicine, Bronx, NY, United States
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Ortuño MJ, Robinson ST, Subramanyam P, Paone R, Huang YY, Guo XE, Colecraft HM, Mann JJ, Ducy P. Serotonin-reuptake inhibitors act centrally to cause bone loss in mice by counteracting a local anti-resorptive effect. Nat Med 2016; 22:1170-1179. [PMID: 27595322 PMCID: PMC5053870 DOI: 10.1038/nm.4166] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/19/2016] [Indexed: 02/06/2023]
Abstract
The use of selective serotonin-reuptake inhibitors (SSRIs) has been associated with an increased risk of bone fracture, raising concerns about their increasingly broader usage. This deleterious effect is poorly understood, and thus strategies to avoid this side effect remain elusive. We show here that fluoxetine (Flx), one of the most-prescribed SSRIs, acts on bone remodeling through two distinct mechanisms. Peripherally, Flx has anti-resorptive properties, directly impairing osteoclast differentiation and function through a serotonin-reuptake-independent mechanism that is dependent on intracellular Ca2+ levels and the transcription factor Nfatc1. With time, however, Flx also triggers a brain-serotonin-dependent rise in sympathetic output that increases bone resorption sufficiently to counteract its local anti-resorptive effect, thus leading to a net effect of impaired bone formation and bone loss. Accordingly, neutralizing this second mode of action through co-treatment with the β-blocker propranolol, while leaving the peripheral effect intact, prevents Flx-induced bone loss in mice. Hence, this study identifies a dual mode of action of SSRIs on bone remodeling and suggests a therapeutic strategy to block the deleterious effect on bone homeostasis from their chronic use.
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Affiliation(s)
- María José Ortuño
- Department of Genetics & Development, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Samuel T. Robinson
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Prakash Subramanyam
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY, USA
| | - Riccardo Paone
- Department of Genetics & Development, College of Physicians & Surgeons, Columbia University, New York, NY, USA
- Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, L’Aquila, Italy
| | - Yung-yu Huang
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - X. Edward Guo
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Henry M. Colecraft
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY, USA
| | - J. John Mann
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Patricia Ducy
- Department of Pathology & Cell Biology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
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Chen W, Gao B, Hao L, Zhu G, Jules J, Macdougall MJ, Han X, Zhou X, Li YP. The silencing of cathepsin K used in gene therapy for periodontal disease reveals the role of cathepsin K in chronic infection and inflammation. J Periodontal Res 2016; 51:647-60. [PMID: 26754272 PMCID: PMC5482270 DOI: 10.1111/jre.12345] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2015] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVE Periodontitis is a severe chronic inflammatory disease and one of the most prevalent non-communicable chronic diseases that affects the majority of the world's adult population. While great efforts have been devoted toward understanding the pathogenesis of periodontitis, there remains a pressing need for developing potent therapeutic strategies for targeting this dreadful disease. In this study, we utilized adeno-associated virus (AAV) expressing cathepsin K (Ctsk) small hairpin (sh)RNA (AAV-sh-Ctsk) to silence Ctsk in vivo and subsequently evaluated its impact in periodontitis as a potential therapeutic strategy for this disease. MATERIAL AND METHODS We used a known mouse model of periodontitis, in which wild-type BALB/cJ mice were infected with Porphyromonas gingivalis W50 in the maxillary and mandibular periodontium to induce the disease. AAV-sh-Ctsk was then administrated locally into the periodontal tissues in vivo, followed by analyses to assess progression of the disease. RESULTS AAV-mediated Ctsk silencing drastically protected mice (> 80%) from P. gingivalis-induced bone resorption by osteoclasts. In addition, AAV-sh-Ctsk administration drastically reduced inflammation by impacting the expression of many inflammatory cytokines as well as T-cell and dendritic cell numbers in periodontal lesions. CONCLUSION AAV-mediated Ctsk silencing can simultaneously target both the inflammation and bone resorption associated with periodontitis through its inhibitory effect on immune cells and osteoclast function. Thereby, AAV-sh-Ctsk administration can efficiently protect against periodontal tissue damage and alveolar bone loss, establishing this AAV-mediated local silencing of Ctsk as an important therapeutic strategy for effectively treating periodontal disease.
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Affiliation(s)
- Wei Chen
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
| | - Bo Gao
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
- The State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, People’s Republic of China
| | - Liang Hao
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
- The State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, People’s Republic of China
| | - Guochun Zhu
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
| | - Joel Jules
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
| | - Mary J. Macdougall
- Institute of Oral Health Research, School of Dentistry, University of Alabama at Birmingham, SDB Room 702, 1919 7 Avenue South, Birmingham AL 35233, USA
| | - Xiaozhe Han
- Department of Immunology and Infectious Disease, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA
| | - Xuedong Zhou
- The State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, People’s Republic of China
| | - Yi-Ping Li
- Department of Pathology, University of Alabama at Birmingham, SHEL 810, 1825 University Blvd, Birmingham AL 35294-2182, USA
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Abstract
The pseudo-kinase family of tribbles (TRIB) proteins has been linked to a variety of cell signalling pathways and appears to have functionally divergent roles with respect to intracellular protein degradation and the ability to regulate signal transduction pathways. In the arthritides, inflammation and a wide variety of pro-inflammatory pathways have been implicated to drive the cartilage destruction and consequent disability associated with both rheumatoid arthritis (RA) and osteoarthritis (OA). Despite burgeoning evidence linking the TRIB to inflammation-related pathologies such as diabetes, multiple sclerosis and cancer, very little is known about their roles in arthritis. The present review discusses current knowledge of the impact of TRIB on pro-inflammatory cellular mechanisms and pathways known to be important in the pathogenesis of RA and OA.
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