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Na J, Tai C, Wang Z, Yang Z, Chen X, Zhang J, Zheng L, Fan Y. Stiff extracellular matrix drives the differentiation of mesenchymal stem cells toward osteogenesis by the multiscale 3D genome reorganization. Biomaterials 2024; 312:122715. [PMID: 39094522 DOI: 10.1016/j.biomaterials.2024.122715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 07/17/2024] [Accepted: 07/26/2024] [Indexed: 08/04/2024]
Abstract
Extracellular matrix (ECM) stiffness is a major driver of stem cell fate. However, the involvement of the three-dimensional (3D) genomic reorganization in response to ECM stiffness remains unclear. Here, we generated comprehensive 3D chromatin landscapes of mesenchymal stem cells (MSCs) exposed to various ECM stiffness. We found that there were more long-range chromatin interactions, but less compartment A in MSCs cultured on stiff ECM than those cultured on soft ECM. However, the switch from compartment B in MSCs cultured on soft ECM to compartment A in MSCs cultured on stiff ECM included genes encoding proteins primarily enriched in cytoskeleton organization. At the topologically associating domains (TADs) level, stiff ECM tends to have merged TADs on soft ECM. These merged TADs on stiff ECM include upregulated genes encoding proteins enriched in osteogenesis, such as SP1, ETS1, and DCHS1, which were validated by quantitative real-time polymerase chain reaction and found to be consistent with the increase of alkaline phosphatase staining. Knockdown of SP1 or ETS1 led to the downregulation of osteogenic marker genes, including COL1A1, RUNX2, ALP, and OCN in MSCs cultured on stiff ECM. Our study provides an important insight into the stiff ECM-mediated promotion of MSC differentiation towards osteogenesis, emphasizing the influence of mechanical cues on the reorganization of 3D genome architecture and stem cell fate.
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Affiliation(s)
- Jing Na
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Chengzheng Tai
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Ziyi Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Zhijie Yang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Xinyuan Chen
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Jing Zhang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China; Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Engineering Medicine, Beihang University, Beijing, 100083, China.
| | - Lisha Zheng
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China.
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China.
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Suthon S, Lin J, Perkins RS, Miranda-Carboni GA, Krum SA. Regulation and Function of FOXC1 in Osteoblasts. J Dev Biol 2023; 11:38. [PMID: 37754840 PMCID: PMC10531946 DOI: 10.3390/jdb11030038] [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: 08/18/2023] [Revised: 09/11/2023] [Accepted: 09/15/2023] [Indexed: 09/28/2023] Open
Abstract
Estrogens, which bind to estrogen receptor alpha (ERα), are important for proper bone mineral density. When women go through menopause, estrogen levels decrease, and there is a decrease in bone quality, along with an increased risk for fractures. We previously identified an enhancer near FOXC1 as the most significantly enriched binding site for estrogen receptor alpha (ERα) in osteoblasts. FOXC1 is a transcription factor belonging to a large group of proteins known as forkhead box genes and is an important regulator of bone formation. Here, we demonstrate that 17β-estradiol (E2) increases the mRNA and protein levels of FOXC1 in primary mouse and human osteoblasts. GATA4 is a pioneer factor for ERα and it is also recruited to enhancers near Foxc1. Knockdown of Gata4 in mouse osteoblasts in vitro decreases Foxc1 expression as does knockout of Gata4 in vivo. Functionally, GATA4 and FOXC1 interact and regulate osteoblast proteins such as RUNX2, as demonstrated by ChIP-reChIP and luciferase assays. The most enriched motif in GATA4 binding sites from ChIP-seq is for FOXC1, supporting the notion that GATA4 and FOXC1 cooperate in regulating osteoblast differentiation. Together, these data demonstrate the interactions of the transcription factors ERα, GATA4, and FOXC1 to regulate each other's expression and other osteoblast differentiation genes.
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Affiliation(s)
- Sarocha Suthon
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Jianjian Lin
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Rachel S. Perkins
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Gustavo A. Miranda-Carboni
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Susan A. Krum
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN 38163, USA
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3
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Li X, Kaur N, Albahrani M, Karpf AR, Black AR, Black JD. Crosstalk between protein kinase C α and transforming growth factor β signaling mediated by Runx2 in intestinal epithelial cells. J Biol Chem 2023; 299:103017. [PMID: 36791912 PMCID: PMC10036670 DOI: 10.1016/j.jbc.2023.103017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 02/02/2023] [Accepted: 02/04/2023] [Indexed: 02/15/2023] Open
Abstract
Tight coordination of growth regulatory signaling is required for intestinal epithelial homeostasis. Protein kinase C α (PKCα) and transforming growth factor β (TGFβ) are negative regulators of proliferation with tumor suppressor properties in the intestine. Here, we identify novel crosstalk between PKCα and TGFβ signaling. RNA-Seq analysis of nontransformed intestinal crypt-like cells and colorectal cancer cells identified TGFβ receptor 1 (TGFβR1) as a target of PKCα signaling. RT-PCR and immunoblot analysis confirmed that PKCα positively regulates TGFβR1 mRNA and protein expression in these cells. Effects on TGFβR1 were dependent on Ras-extracellular signal-regulated kinase 1/2 (ERK) signaling. Nascent RNA and promoter-reporter analysis indicated that PKCα induces TGFβR1 transcription, and Runx2 was identified as an essential mediator of the effect. PKCα promoted ERK-mediated activating phosphorylation of Runx2, which preceded transcriptional activation of the TGFβR1 gene and induction of Runx2 expression. Thus, we have identified a novel PKCα→ERK→Runx2→TGFβR1 signaling axis. In further support of a link between PKCα and TGFβ signaling, PKCα knockdown reduced the ability of TGFβ to induce SMAD2 phosphorylation and cell cycle arrest, and inhibition of TGFβR1 decreased PKCα-induced upregulation of p21Cip1 and p27Kip1 in intestinal cells. The physiological relevance of these findings is also supported by The Cancer Genome Atlas data showing correlation between PKCα, Runx2, and TGFβR1 mRNA expression in human colorectal cancer. PKCα also regulated TGFβR1 in endometrial cancer cells, and PKCα, Runx2, and TGFβR1 expression correlates in uterine tumors, indicating that crosstalk between PKCα and TGFβ signaling may be a common mechanism in diverse epithelial tissues.
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Affiliation(s)
- Xinyue Li
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Navneet Kaur
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Mustafa Albahrani
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Adam R Karpf
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Adrian R Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Jennifer D Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA.
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Phosphorylation-mediated interaction between human E26 transcription factor 1 and specific protein 1 is required for tumor cell migration. Acta Biochim Biophys Sin (Shanghai) 2022; 54:1441-1452. [PMID: 36305724 PMCID: PMC9828152 DOI: 10.3724/abbs.2022148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Transcription factors, human E26 transcription factor 1 (Ets1) and specific protein 1 (Sp1), are known to induce gene expression in tumorigenicity. High Ets1 expression is often associated with colorectal tumorigenesis. In this study, we discover that metastasis and clone formation in SW480 cells mainly depend on the direct interaction between Ets1 and Sp1 instead of high Ets1 expression. The interaction domains are further addressed to be the segment at Sp1(626-708) and the segment at Ets1(244-331). In addition, the phosphorylation inhibition of Ets1 at Tyr283 by either downregulation of Src kinase or Src family inhibitor treatment decreases the interaction between Sp1 and Ets1 and suppresses SW480 migration. Either administration or overexpression of the peptides harboring the interaction segment strongly inhibits the colony formation and migration of SW480 cells. Our findings suggest that the interaction between Ets1 and Sp1 rather than Ets1 alone promotes transformation in SW480 cells and provide new insight into the Ets1 and Sp1 interaction as an antitumour target in SW480 cells.
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5
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Li L, Wang Y, Wang Z, Xue D, Dai C, Gao X, Ma J, Hang K, Pan Z. Knockdown of FOXA1 enhances the osteogenic differentiation of human bone marrow mesenchymal stem cells partly via activation of the ERK1/2 signalling pathway. Stem Cell Res Ther 2022; 13:456. [PMID: 36064451 PMCID: PMC9446550 DOI: 10.1186/s13287-022-03133-2] [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: 06/02/2022] [Accepted: 08/11/2022] [Indexed: 11/21/2022] Open
Abstract
Background The available therapeutic options for large bone defects remain extremely limited, requiring new strategies to accelerate bone healing. Genetically modified bone mesenchymal stem cells (BMSCs) with enhanced osteogenic capacity are recognised as one of the most promising treatments for bone defects. Methods We performed differential expression analysis of miRNAs between human BMSCs (hBMSCs) and human dental pulp stem cells (hDPSCs) to identify osteogenic differentiation-related microRNAs (miRNAs). Furthermore, we identified shared osteogenic differentiation-related miRNAs and constructed an miRNA-transcription network. The Forkhead box protein A1 (FOXA1) knockdown strategy with a lentiviral vector was used to explore the role of FOXA1 in the osteogenic differentiation of MSCs. Cell Counting Kit-8 was used to determine the effect of the knockdown of FOXA1 on hBMSC proliferation; real-time quantitative reverse transcription PCR (qRT-PCR) and western blotting were used to investigate target genes and proteins; and alkaline phosphatase (ALP) staining and Alizarin Red staining (ARS) were used to assess ALP activity and mineral deposition, respectively. Finally, a mouse model of femoral defects was established in vivo, and histological evaluation and radiographic analysis were performed to verify the therapeutic effects of FOXA1 knockdown on bone healing. Results We identified 22 shared and differentially expressed miRNAs between hDPSC and hBMSC, 19 of which were downregulated in osteogenically induced samples. The miRNA-transcription factor interaction network showed that FOXA1 is the most significant and novel osteogenic differentiation biomarker among more than 300 transcription factors that is directly targeted by 12 miRNAs. FOXA1 knockdown significantly promoted hBMSC osteo-specific genes and increased mineral deposits in vitro. In addition, p-ERK1/2 levels were upregulated by FOXA1 silencing. Moreover, the increased osteogenic differentiation of FOXA1 knockdown hBMSCs was partially rescued by the addition of ERK1/2 signalling inhibitors. In a mouse model of femoral defects, a sheet of FOXA1-silencing BMSCs improved bone healing, as detected by microcomputed tomography and histological evaluation. Conclusion These findings collectively demonstrate that FOXA1 silencing promotes the osteogenic differentiation of BMSCs via the ERK1/2 signalling pathway, and silencing FOXA1 in vivo effectively promotes bone healing, suggesting that FOXA1 may be a novel target for bone healing.
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Affiliation(s)
- Lijun Li
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Yibo Wang
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Zhongxiang Wang
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Deting Xue
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Chengxin Dai
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Xiang Gao
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China.,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China.,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China
| | - Jianfei Ma
- Key Laboratory of Image Information Processing and Intelligent Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Kai Hang
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China. .,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China. .,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China. .,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China.
| | - Zhijun Pan
- Department of Orthopedics Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou City, Zhejiang Province, People's Republic of China. .,Orthopedics Research Institute of Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China. .,Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou City, Zhejiang Province, People's Republic of China. .,Clinical Research Center of Motor System Disease of Zhejiang Province, Zhejiang Province, Hangzhou City, People's Republic of China.
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Kurita T, Li X, Bhawal UK. Crosstalk between microRNA-21–5p and the transcription factor Dec1 maintains osteoblast function. Biochem Biophys Res Commun 2022; 632:32-39. [DOI: 10.1016/j.bbrc.2022.09.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/01/2022] [Accepted: 09/22/2022] [Indexed: 11/26/2022]
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7
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Chanpaisaeng K, Reyes‐Fernandez PC, Dilkes B, Fleet JC. Diet X Gene Interactions Control Femoral Bone Adaptation To Low Dietary Calcium. JBMR Plus 2022; 6:e10668. [PMID: 36111202 PMCID: PMC9465001 DOI: 10.1002/jbm4.10668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 06/29/2022] [Accepted: 07/22/2022] [Indexed: 11/12/2022] Open
Affiliation(s)
- Krittikan Chanpaisaeng
- Functional Ingredients and Food Innovation Research Group, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) Pathum Thani Thailand
| | - Perla C. Reyes‐Fernandez
- School of Health and Human Sciences, Department of Physical Therapy Indiana University ‐ Purdue University Indianapolis Indianapolis IN USA
| | - Brian Dilkes
- Center for Plant Biology Purdue University West Lafayette IN USA
- Department of Biochemistry Purdue University West Lafayette IN USA
| | - James C. Fleet
- Department of Nutritional Sciences and the Dell Pediatric Research Institute University of Texas Austin TX USA
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Thyroid-Stimulating Hormone Favors Runx2-Mediated Matrix Mineralization in HOS and SaOS2 Cells: An In Vitro and In Silico Approach. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27030613. [PMID: 35163879 PMCID: PMC8838199 DOI: 10.3390/molecules27030613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 11/16/2022]
Abstract
Osteoporosis is a skeletal disease that is both systemic and silent characterized by an unbalanced activity of bone remodeling leading to bone loss. Rising evidences demonstrate that thyroid stimulating hormone (TSH) has an important role in the regulation on the metabolism of bone. However, TSH regulation on human osteoblast essential transcriptional factors has not been identified. Current study examined the role of TSH on human osteoblastic Runx2 expression and their functional genes by in vitro and in slico analysis. Human osteoblast like (HOS and SaoS-2) cells were cultured with DMEM and treated with hTSH at the concentration of 0.01 ng/mL and 10 ng/mL. After treatment, osteoblastic Runx2 and IGF-1R beta expression were studied using RT-PCR and western blot analysis. TSH treatment induced osteoblastic essential transcriptional factor, Runx2 in HOS and SaOS2 cells on 48 h duration and elevated the expression of IGF-IR β gene and Protein in SaoS-2 cells. TSH also promotes Runx2 responsive genes such as ALP, Collagen and osteocalcin in SaOS2 cells on day 2 to day 14 of 10 ng/mL of treatment and favors' matrix mineralization matrix in these cells. In addition, TSH facilitated human osteoblastic cells to mineralize their matrix confirmed by day 21 of alizarin red calcium staining. In silico study was performed to check CREB and ELK1 interaction with Runx2. Results of in silico analysis showed that TSH mediated signalling molecules such as CREB and ELK1 showed interaction with Runx2 which involve in osteobalstic gene expression and differentiation. Present findings confirm that TSH promotes Runx2 expression, osteoblastic responsive genes and bone matrix formation.
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Xia W, Han X, Wang L. E26 transformation-specific 1 is implicated in the inhibition of osteogenic differentiation induced by chronic high glucose by directly regulating Runx2 expression. J Biomed Res 2022; 36:39-47. [PMID: 35403609 PMCID: PMC8894288 DOI: 10.7555/jbr.35.20210123] [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] [Indexed: 11/08/2022] Open
Abstract
Chronic high glucose (HG) plays a crucial role in the pathogenesis of diabetes-induced osteoporosis by inhibiting the differentiation and proliferation of osteoblasts. This study aims to examine the role of E26 transformation-specific 1 (ETS1) in the inhibition of osteoblast differentiation and proliferation caused by chronic HG, as well as the underlying mechanism. Chronic HG treatment downregulated ETS1 expression and inhibited differentiation and proliferation of MC3T3-E1 cells. Downregulation of ETS1 expression inhibited the differentiation and proliferation of MC3T3-E1 cells under normal glucose conditions, and ETS1 overexpression attenuated the damage to cells exposed to chronic HG. In addition, ETS1 overexpression reversed the decrease in runt-related transcription factor 2 (Runx2) expression in MC3T3-E1 cells treated with chronic HG. Using chromatin immunoprecipitation (ChIP) and luciferase reporter assays, we confirmed that ETS1 directly bound to and increased the activity of the Runx2 promoter. In summary, our study suggested that ETS1 was involved in the inhibitory effect of chronic HG on osteogenic differentiation and proliferation and may be a potential therapeutic target for diabetes-induced osteoporosis.
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Affiliation(s)
- Wenqian Xia
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, Jiangsu 210009, China
- The Affiliated Nantong Stomatological Hospital of Nantong University, Nantong, Jiangsu 226001, China
| | - Xiao Han
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Xiao Han, Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, 101 Longmian Avenue, Nanjing, Jiangsu 211166, China. Tel: +86-25-86869426, E-mail:
| | - Lin Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, Jiangsu 210009, China
- Lin Wang, Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 1 Shanghai Road, Nanjing, Jiangsu 210009, China. Tel: +86-25-69593065, E-mail:
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Groven RVM, van Koll J, Poeze M, Blokhuis TJ, van Griensven M. miRNAs Related to Different Processes of Fracture Healing: An Integrative Overview. Front Surg 2021; 8:786564. [PMID: 34869574 PMCID: PMC8639603 DOI: 10.3389/fsurg.2021.786564] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 10/25/2021] [Indexed: 12/21/2022] Open
Abstract
Fracture healing is a complex, dynamic process that is directed by cellular communication and requires multiple cell types, such as osteoblasts, osteoclasts, and immune cells. Physiological fracture healing can be divided into several phases that consist of different processes, such as angiogenesis, osteogenesis, and bone resorption/remodelling. This is needed to guarantee proper bone regeneration after fracture. Communication and molecular regulation between different cell types and within cells is therefore key in successfully orchestrating these processes to ensure adequate bone healing. Among others, microRNAs (miRNAs) play an important role in cellular communication. microRNAs are small, non-coding RNA molecules of ~22 nucleotides long that can greatly influence gene expression by post-transcriptional regulation. Over the course of the past decade, more insights have been gained in the field of miRNAs and their role in cellular signalling in both inter- and intracellular pathways. The interplay between miRNAs and their mRNA targets, and the effect thereof on different processes and aspects within fracture healing, have shown to be interesting research topics with possible future diagnostic and therapeutic potential. Considering bone regeneration, research moreover focusses on specific microRNAs and their involvement in individual pathways. However, it is required to combine these data to gain more understanding on the effects of miRNAs in the dynamic process of fracture healing, and to enhance their translational application in research, as well as in the clinic. Therefore, this review aims to provide an integrative overview on miRNAs in fracture healing, related to several key aspects in the fracture healing cascade. A special focus will be put on hypoxia, angiogenesis, bone resorption, osteoclastogenesis, mineralization, osteogenesis, osteoblastogenesis, osteocytogenesis, and chondrogenesis.
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Affiliation(s)
- Rald V M Groven
- Department of Cell Biology-Inspired Tissue Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands.,Division of Traumasurgery, Department of Surgery, Maastricht University Medical Center, Maastricht, Netherlands
| | - Johan van Koll
- Department of Cell Biology-Inspired Tissue Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands
| | - Martijn Poeze
- Division of Traumasurgery, Department of Surgery, Maastricht University Medical Center, Maastricht, Netherlands
| | - Taco J Blokhuis
- Division of Traumasurgery, Department of Surgery, Maastricht University Medical Center, Maastricht, Netherlands
| | - Martijn van Griensven
- Department of Cell Biology-Inspired Tissue Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands
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11
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Hasegawa Y, Struhl K. Different SP1 binding dynamics at individual genomic loci in human cells. Proc Natl Acad Sci U S A 2021; 118:e2113579118. [PMID: 34764224 PMCID: PMC8609546 DOI: 10.1073/pnas.2113579118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/06/2021] [Indexed: 11/18/2022] Open
Abstract
Using a tamoxifen-inducible time-course ChIP-sequencing (ChIP-seq) approach, we show that the ubiquitous transcription factor SP1 has different binding dynamics at its target sites in the human genome. SP1 very rapidly reaches maximal binding levels at some sites, but binding kinetics at other sites is biphasic, with rapid half-maximal binding followed by a considerably slower increase to maximal binding. While ∼70% of SP1 binding sites are located at promoter regions, loci with slow SP1 binding kinetics are enriched in enhancer and Polycomb-repressed regions. Unexpectedly, SP1 sites with fast binding kinetics tend to have higher quality and more copies of the SP1 sequence motif. Different cobinding factors associate near SP1 binding sites depending on their binding kinetics and on their location at promoters or enhancers. For example, NFY and FOS are preferentially associated near promoter-bound SP1 sites with fast binding kinetics, whereas DNA motifs of ETS and homeodomain proteins are preferentially observed at sites with slow binding kinetics. At promoters but not enhancers, proteins involved in sumoylation and PML bodies associate more strongly with slow SP1 binding sites than with the fast binding sites. The speed of SP1 binding is not associated with nucleosome occupancy, and it is not necessarily coupled to higher transcriptional activity. These results with SP1 are in contrast to those of human TBP, indicating that there is no common mechanism affecting transcription factor binding kinetics. The biphasic kinetics at some SP1 target sites suggest the existence of distinct chromatin states at these loci in different cells within the overall population.
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Affiliation(s)
- Yuko Hasegawa
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115
| | - Kevin Struhl
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115
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12
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Weng Y, Wang Z, Fukuhara Y, Tanai A, Ikegame M, Yamada D, Takarada T, Izawa T, Hayano S, Yoshida K, Kamioka H, Okamura H. O-GlcNAcylation drives calcium signaling toward osteoblast differentiation: A bioinformatics-oriented study. Biofactors 2021; 47:992-1015. [PMID: 34418170 DOI: 10.1002/biof.1774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/16/2021] [Indexed: 12/12/2022]
Abstract
This study aimed to reveal the possible mechanisms by which O-linked-N-acetylglucosaminylation (O-GlcNAcylation) regulates osteoblast differentiation using a series of bioinformatics-oriented experiments. To examine the influence of O-GlcNAcylation levels on osteoblast differentiation, osteoblastic MC3T3-E1 cells were treated with O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA) inhibitors. Correlations between the levels of O-GlcNAcylation and the expression of osteogenic markers as well as OGT were evaluated by qPCR and western blotting. The O-GlcNAcylated proteins assumed to correlate with Runx2 expression were retrieved from several public databases and used for further bioinformatics analysis. Following the findings of the bioinformatics analysis, intracellular calcium ([Ca2+ ]i ) was monitored in the cells treated with OGT and OGA inhibitors using a confocal laser-scanning microscope (CLS). The interaction effect between O-GlcNAcylation and [Ca2+ ]i on osteogenic marker expression was determined using stable OGT knockdown MC3T3-E1 cells. O-GlcNAcylation was positively associated with osteoblast differentiation. The time-course profile of global O-GlcNAcylated proteins showed a distinctive pattern with different molecular weights during osteoblast differentiation. The expression pattern of several O-GlcNAcylated proteins was significantly similar to that of Runx2 expression. Bioinformatic analysis of the retrieved Runx2-related-O-GlcNAcylated-proteins revealed the importance of [Ca2+ ]i . CLS showed that alteration of O-GlcNAcylation rapidly changed [Ca2+ ]i in MC3T3-E1 cells. O-GlcNAcylation and [Ca2+ ]i showed an interaction effect on the expression of osteogenic markers. OGT knockdown disrupted the [Ca2+ ]i -induced expression changes of osteogenic markers. O-GlcNAcylation interacts with [Ca2+ ]i and elicits osteoblast differentiation by regulating the expression of osteogenic markers.
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Affiliation(s)
- Yao Weng
- Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Ziyi Wang
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Yoko Fukuhara
- Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Airi Tanai
- Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Mika Ikegame
- Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Daisuke Yamada
- Department of Regenerative Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Takeshi Takarada
- Department of Regenerative Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Takashi Izawa
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Satoru Hayano
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Kaya Yoshida
- Department of Oral Healthcare Education, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Hiroshi Kamioka
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Hirohiko Okamura
- Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
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Hua L, Zhang X. MALAT1 regulates osteogenic differentiation of human periodontal ligament stem cells through mediating miR-155-5p/ETS1 axis. Tissue Cell 2021; 73:101619. [PMID: 34399118 DOI: 10.1016/j.tice.2021.101619] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 08/02/2021] [Accepted: 08/03/2021] [Indexed: 12/28/2022]
Abstract
BACKGROUND Osteogenic differentiation of human periodontal ligament stem cells is essential to periodontal regeneration treatment for periodontitis. This study investigated the mechanism of lncRNAs-related osteogenic differentiation. METHODS Human periodontal ligament stem cells were extracted from human periodontal ligament and identified via flow cytometry. After being induced into osteogenic differentiation for three weeks using osteoblast inducing conditional media, human periodontal ligament stem cells were transfected with siRNA-MALAT1, or miR-155-5p inhibitor. Human periodontal ligament stem cells osteogenesis was observed by alkaline phosphatase staining, followed by alizarin red staining for evaluating mineralized nodes formation. Runt-related gene 2, collagen-1 and osteocalcin expressions were assessed by western blot and qRT-PCR. RESULTS MALAT1 expression was assumed a negative correlation with miR-155-5p expression which was dropping over time in differentiating human periodontal ligament stem cells. MALAT1 could bind with miR-155-5p, and E26 transformation specific-1 (ETS1) was the targeted gene of miR-155-5p. Silenced MALAT1 suppressed ALP activity and mineralized nodes formation and inhibited the expressions of runt-related gene 2, collagen-1 and osteocalcin in differentiating human periodontal ligament stem cells, while miR-155-5p inhibitor reversed the effect of si-MALAT1 on differentiation of human periodontal ligament stem cells. CONCLUSION MALAT1 modulated differentiation of human periodontal ligament stem cells via regulating miR-155-5p.
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Affiliation(s)
- Li Hua
- Department of Stomatology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, 215006, China
| | - Xiaohong Zhang
- Department of Stomatology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, 215006, China.
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14
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He S, Guan Y, Wu Y, Zhu L, Yan B, Honda H, Yang J, Liu W. DEC1 deficiency results in accelerated osteopenia through enhanced DKK1 activity and attenuated PI3KCA/Akt/GSK3β signaling. Metabolism 2021; 118:154730. [PMID: 33607194 PMCID: PMC8311383 DOI: 10.1016/j.metabol.2021.154730] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 02/02/2021] [Accepted: 02/09/2021] [Indexed: 12/22/2022]
Abstract
BACKGROUND Human differentiated embryonic chondrocyte expressed gene 1 (DEC1) has been implicated in enhancing osteogenesis, a desirable outcome to counteract against deregulated bone formation such as retarded bone development, osteopenia and osteoporosis. METHODS AND RESULTS DEC1 knockout (KO) and the age-matched wild-type (WT) mice were tested for the impact of DEC1 deficiency on bone development and osteopenia as a function of age. DEC1 deficiency exhibited retarded bone development at the age of 4 weeks and osteopenic phenotype in both 4- and 24-week old mice. However, the osteopenia was more severe in the 24-week age groups. Mechanistically, DEC1 deficiency downregulated the expression of bone-enhancing genes such as Runx2 and β-catenin accompanied by upregulating DKK1, an inhibitor of the Wnt/β-catenin signaling pathway. Consistently, DEC1 deficiency favored the attenuation of the integrated PI3KCA/Akt/GSK3β signaling, a pathway targeting β-catenin for degradation. Likewise, the attenuation was greater in the 24-week age group. These changes, however, were reversed by in vivo treatment with lithium chloride, a stabilizer of β-catenin, and confirmed by gain-of-function study with DEC1 transfection into DEC1 KO bone marrow mesenchymal stem cells and loss-of-function study with siDEC1 lentiviral infection into the corresponding WT cells. CONCLUSION DEC1 is a positive regulator with a broad activity spectrum in both bone development and maintenance, and the osteopenic phenotype accelerated by DEC1 deficiency is achieved by enhanced DKK1 activity and attenuated PI3KCA/Akt/GSK3β signaling.
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Affiliation(s)
- Shuangcheng He
- Department of Pharmacology, Nanjing Medical University, China
| | - Yu Guan
- Department of Pharmacology, Nanjing Medical University, China
| | - Yichen Wu
- Department of Pharmacology, Nanjing Medical University, China
| | - Ling Zhu
- Department of Pharmacology, Nanjing Medical University, China
| | - Bingfang Yan
- James L. Winkle College of Pharmacy University of Cincinnati, Cincinnati, OH 45229, USA
| | - Hiroaki Honda
- Research Institute for Radiation Biology and Medicine, Hiroshima University, Japan
| | - Jian Yang
- Department of Pharmacology, Nanjing Medical University, China
| | - Wei Liu
- Department of Pharmacology, Nanjing Medical University, China
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15
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Montecino M, Carrasco ME, Nardocci G. Epigenetic Control of Osteogenic Lineage Commitment. Front Cell Dev Biol 2021; 8:611197. [PMID: 33490076 PMCID: PMC7820369 DOI: 10.3389/fcell.2020.611197] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 12/11/2020] [Indexed: 12/22/2022] Open
Abstract
Within the eukaryotic nucleus the genomic DNA is organized into chromatin by stably interacting with the histone proteins as well as with several other nuclear components including non-histone proteins and non-coding RNAs. Together these interactions distribute the genetic material into chromatin subdomains which can exhibit higher and lower compaction levels. This organization contributes to differentially control the access to genomic sequences encoding key regulatory genetic information. In this context, epigenetic mechanisms play a critical role in the regulation of gene expression as they modify the degree of chromatin compaction to facilitate both activation and repression of transcription. Among the most studied epigenetic mechanisms we find the methylation of DNA, ATP-dependent chromatin remodeling, and enzyme-mediated deposition and elimination of post-translational modifications at histone and non-histone proteins. In this mini review, we discuss evidence that supports the role of these epigenetic mechanisms during transcriptional control of osteoblast-related genes. Special attention is dedicated to mechanisms of epigenetic control operating at the Runx2 and Sp7 genes coding for the two principal master regulators of the osteogenic lineage during mesenchymal stem cell commitment.
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Affiliation(s)
- Martin Montecino
- Faculty of Medicine and Faculty of Life Sciences, Institute of Biomedical Sciences and FONDAP Center for Genome Regulation, Universidad Andres Bello, Santiago, Chile
| | - Margarita E Carrasco
- Faculty of Medicine and Faculty of Life Sciences, Institute of Biomedical Sciences and FONDAP Center for Genome Regulation, Universidad Andres Bello, Santiago, Chile
| | - Gino Nardocci
- Faculty of Medicine, Universidad de los Andes, Santiago, Chile.,Molecular Biology and Bioinformatic Lab, Program in Molecular Biology and Bioinformatics, Center for Biomedical Research and Innovation (CIIB), Universidad de los Andes, Santiago, Chile
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16
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TRIM21-regulated Annexin A2 plasma membrane trafficking facilitates osteosarcoma cell differentiation through the TFEB-mediated autophagy. Cell Death Dis 2021; 12:21. [PMID: 33414451 PMCID: PMC7790825 DOI: 10.1038/s41419-020-03364-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 12/15/2020] [Accepted: 12/18/2020] [Indexed: 12/25/2022]
Abstract
Osteosarcoma (OS) is the most common primary malignant bone tumor in children and adolescents, which is characterized by dysfunctional autophagy and poor differentiation. Our recent studies have suggested that the tripartite motif containing-21 (TRIM21) plays a crucial role in regulating OS cell senescence and proliferation via interactions with several proteins. Yet, its implication in autophagy and differentiation in OS is largely unknown. In the present study, we first showed that TRIM21 could promote OS cell autophagy, as determined by the accumulation of LC3-II, and the degradation of cargo receptor p62. Further, we were able to identify that Annexin A2 (ANXA2), as a novel interacting partner of TRIM21, was critical for TIRM21-induced OS cell autophagy. Although TRIM21 had a negligible effect on the mRNA and protein expressions of ANXA2, we did find that TRIM21 facilitated the translocation of ANXA2 toward plasma membrane (PM) in OS cells through a manner relying on TRIM21-mediated cell autophagy. This functional link has been confirmed by observing a nice co-expression of TRIM21 and ANXA2 (at the PM) in the OS tissues. Mechanistically, we demonstrated that TRIM21, via facilitating the ANXA2 trafficking at the PM, enabled to release the transcription factor EB (TFEB, a master regulator of autophagy) from the ANXA2-TFEB complex, which in turn entered into the nucleus for the regulation of OS cell autophagy. In accord with previous findings that autophagy plays a critical role in the control of differentiation, we also demonstrated that autophagy inhibited OS cell differentiation, and that the TRIM21/ANXA2/TFEB axis is implicated in OS cell differentiation through the coordination with autophagy. Taken together, our results suggest that the TRIM21/ANXA2/TFEB axis is involved in OS cell autophagy and subsequent differentiation, indicating that targeting this signaling axis might lead to a new clue for OS treatment.
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17
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Fan Q, Li Y, Sun Q, Jia Y, He C, Sun T. miR-532-3p inhibits osteogenic differentiation in MC3T3-E1 cells by downregulating ETS1. Biochem Biophys Res Commun 2020; 525:498-504. [DOI: 10.1016/j.bbrc.2020.02.126] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 02/20/2020] [Indexed: 02/08/2023]
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18
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Wang Y, Wang K, Zhang L, Tan Y, Hu Z, Dang L, Zhou H, Li G, Wang H, Zhang S, Shi F, Cao X, Zhang G. Targeted overexpression of the long noncoding RNA ODSM can regulate osteoblast function in vitro and in vivo. Cell Death Dis 2020; 11:133. [PMID: 32071307 PMCID: PMC7028725 DOI: 10.1038/s41419-020-2325-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/04/2020] [Accepted: 02/04/2020] [Indexed: 12/11/2022]
Abstract
Ameliorating bone loss caused by mechanical unloading is a substantial clinical challenge, and the role of noncoding RNAs in this process has attracted increasing attention. In this study, we found that the long noncoding RNA osteoblast differentiation-related lncRNA under simulated microgravity (lncRNA ODSM) could inhibit osteoblast apoptosis and promote osteoblast mineralization in vitro. The increased expression level of the lncRNA ODSM partially reduced apoptosis and promoted differentiation in MC3T3-E1 cells under microgravity unloading conditions, and the effect was partially dependent on miR-139-3p. LncRNA ODSM supplementation in hindlimb-unloaded mice caused a decrease in the number of apoptotic cells in bone tissue and an increase in osteoblast activity. Furthermore, targeted overexpression of the lncRNA ODSM in osteoblasts partially reversed bone loss induced by mechanical unloading at the microstructural and biomechanical levels. These findings are the first to suggest the potential value of the lncRNA ODSM in osteoporosis therapy and the treatment of pathological osteopenia.
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Affiliation(s)
- Yixuan Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Ke Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Lijun Zhang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Yingjun Tan
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, 100094, China
| | - Zebing Hu
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Lei Dang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China
| | - Hua Zhou
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Gaozhi Li
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Han Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Shu Zhang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China
| | - Fei Shi
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China.
| | - Xinsheng Cao
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, 710032, Shaanxi, China.
| | - Ge Zhang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China.
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19
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Raimondo S, Urzì O, Conigliaro A, Lo Bosco G, Parisi S, Carlisi M, Siragusa S, Raimondi L, De Luca A, Giavaresi G, Alessandro R. Extracellular Vesicle microRNAs Contribute to the Osteogenic Inhibition of Mesenchymal Stem Cells in Multiple Myeloma. Cancers (Basel) 2020; 12:cancers12020449. [PMID: 32075123 PMCID: PMC7072478 DOI: 10.3390/cancers12020449] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/05/2020] [Accepted: 02/10/2020] [Indexed: 12/14/2022] Open
Abstract
Osteolytic bone disease is the major complication associated with the progression of multiple myeloma (MM). Recently, extracellular vesicles (EVs) have emerged as mediators of MM-associated bone disease by inhibiting the osteogenic differentiation of human mesenchymal stem cells (hMSCs). Here, we investigated a correlation between the EV-mediated osteogenic inhibition and MM vesicle content, focusing on miRNAs. By the use of a MicroRNA Card, we identified a pool of miRNAs, highly expressed in EVs, from MM cell line (MM1.S EVs), expression of which was confirmed in EVs from bone marrow (BM) plasma of patients affected by smoldering myeloma (SMM) and MM. Notably, we found that miR-129-5p, which targets different osteoblast (OBs) differentiation markers, is enriched in MM-EVs compared to SMM-EVs, thus suggesting a selective packaging correlated with pathological grade. We found that miR-129-5p can be transported to hMSCs by MM-EVs and, by the use of miRNA mimics, we investigated its role in recipient cells. Our data demonstrated that the increase of miR-129-5p levels in hMSCs under osteoblastic differentiation stimuli inhibited the expression of the transcription factor Sp1, previously described as a positive modulator of osteoblastic differentiation, and of its target the Alkaline phosphatase (ALPL), thus identifying miR-129-5p among the players of vesicle-mediated bone disease.
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Affiliation(s)
- Stefania Raimondo
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), Section of Biology and Genetics, University of Palermo, 90133 Palermo, Italy; (S.R.); (O.U.); (A.C.); (S.P.)
| | - Ornella Urzì
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), Section of Biology and Genetics, University of Palermo, 90133 Palermo, Italy; (S.R.); (O.U.); (A.C.); (S.P.)
| | - Alice Conigliaro
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), Section of Biology and Genetics, University of Palermo, 90133 Palermo, Italy; (S.R.); (O.U.); (A.C.); (S.P.)
| | - Giosuè Lo Bosco
- Department of Mathematics and Computer Science, University of Palermo, 90133 Palermo, Italy;
- Department of Sciences for technological innovation, Euro-Mediterranean Institute of Science and Technology, 90133 Palermo, Italy
| | - Sofia Parisi
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), Section of Biology and Genetics, University of Palermo, 90133 Palermo, Italy; (S.R.); (O.U.); (A.C.); (S.P.)
| | - Melania Carlisi
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE), Haematology Unit, University of Palermo, 90133 Palermo, Italy; (M.C.); (S.S.)
| | - Sergio Siragusa
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE), Haematology Unit, University of Palermo, 90133 Palermo, Italy; (M.C.); (S.S.)
| | - Lavinia Raimondi
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy; (L.R.); (A.D.L.); (G.G.)
| | - Angela De Luca
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy; (L.R.); (A.D.L.); (G.G.)
| | - Gianluca Giavaresi
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy; (L.R.); (A.D.L.); (G.G.)
| | - Riccardo Alessandro
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (Bi.N.D.), Section of Biology and Genetics, University of Palermo, 90133 Palermo, Italy; (S.R.); (O.U.); (A.C.); (S.P.)
- Correspondence:
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20
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Narayanan A, Srinaath N, Rohini M, Selvamurugan N. Regulation of Runx2 by MicroRNAs in osteoblast differentiation. Life Sci 2019; 232:116676. [PMID: 31340165 DOI: 10.1016/j.lfs.2019.116676] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/12/2019] [Accepted: 07/20/2019] [Indexed: 12/21/2022]
Abstract
Bone is one of the most dynamic organs in the body that continuously undergoes remodeling through bone formation and resorption. A cascade of molecules and pathways results in the osteoblast differentiation that is attributed to osteogenesis, or bone formation. The process of osteogenesis is achieved through participation of the Wnt pathway, FGFs, BMPs/TGF-β, and transcription factors such as Runx2 and Osx. The activity and function of the master transcription factor, Runx2, is of utmost significance as it can induce the function of osteoblast differentiation markers. A number of microRNAs [miRNAs] have been recently identified in the regulation of Runx2 expression/activity, thus affecting the process of osteogenesis. miRNAs that target Runx2 corepressors favor osteogenesis, while miRNAs that target Runx2 coactivators inhibit osteogenesis. In this review, we focus on the regulation of Runx2 by miRNAs in osteoblast differentiation and their potential for treating bone and bone-related diseases.
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Affiliation(s)
- Akshaya Narayanan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India
| | - N Srinaath
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India
| | - M Rohini
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India
| | - N Selvamurugan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, India.
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21
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Lesch BJ, Tothova Z, Morgan EA, Liao Z, Bronson RT, Ebert BL, Page DC. Intergenerational epigenetic inheritance of cancer susceptibility in mammals. eLife 2019; 8:e39380. [PMID: 30963999 PMCID: PMC6456297 DOI: 10.7554/elife.39380] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 03/03/2019] [Indexed: 12/11/2022] Open
Abstract
Susceptibility to cancer is heritable, but much of this heritability remains unexplained. Some 'missing' heritability may be mediated by epigenetic changes in the parental germ line that do not involve transmission of genetic variants from parent to offspring. We report that deletion of the chromatin regulator Kdm6a (Utx) in the paternal germ line results in elevated tumor incidence in genetically wild type mice. This effect increases following passage through two successive generations of Kdm6a male germline deletion, but is lost following passage through a wild type germ line. The H3K27me3 mark is redistributed in sperm of Kdm6a mutants, and we define approximately 200 H3K27me3-marked regions that exhibit increased DNA methylation, both in sperm of Kdm6a mutants and in somatic tissue of progeny. Hypermethylated regions in enhancers may alter regulation of genes involved in cancer initiation or progression. Epigenetic changes in male gametes may therefore impact cancer susceptibility in adult offspring.
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Affiliation(s)
| | - Zuzana Tothova
- Department of Medicine, Division of HematologyBrigham and Women’s Hospital, Harvard Medical SchoolBostonUnited States
- Broad Institute of MIT and HarvardCambridgeUnited States
| | - Elizabeth A Morgan
- Department of PathologyBrigham and Women’s Hospital, Harvard Medical SchoolBostonUnited States
| | - Zhicong Liao
- Department of GeneticsYale School of MedicineNew HavenUnited States
- Yale Cancer CenterYale School of MedicineNew HavenUnited States
| | - Roderick T Bronson
- Department of PathologyTufts University School of Medicine and Veterinary MedicineNorth GraftonUnited States
| | - Benjamin L Ebert
- Department of Medicine, Division of HematologyBrigham and Women’s Hospital, Harvard Medical SchoolBostonUnited States
- Broad Institute of MIT and HarvardCambridgeUnited States
| | - David C Page
- Whitehead InstituteCambridgeUnited States
- Department of BiologyMassachusetts Institute of TechnologyCambridgeUnited States
- Howard Hughes Medical Institute, Whitehead InstituteCambridgeUnited States
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22
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Wang Y, Wang K, Hu Z, Zhou H, Zhang L, Wang H, Li G, Zhang S, Cao X, Shi F. MicroRNA-139-3p regulates osteoblast differentiation and apoptosis by targeting ELK1 and interacting with long noncoding RNA ODSM. Cell Death Dis 2018; 9:1107. [PMID: 30382082 PMCID: PMC6208413 DOI: 10.1038/s41419-018-1153-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 10/08/2018] [Accepted: 10/16/2018] [Indexed: 12/20/2022]
Abstract
Recent studies have confirmed that microRNAs and lncRNAs can affect bone cell differentiation and bone formation. In this study, miR-139-3p was upregulated in the femurs of hindlimb unloading mice and MC3T3-E1 cells under simulated microgravity; this effect was related to osteoblast differentiation and apoptosis. Silencing miR-139-3p attenuated the suppression of differentiation and the promotion of MC3T3-E1 cell apoptosis induced by simulated microgravity. ELK1 is a target of miR-139-3p and is essential for miR-139-3p to regulate osteoblast differentiation and apoptosis. An osteoblast differentiation-related lncRNA that could interact with miR-139-3p (lncRNA ODSM) was identified in MC3T3-E1 cells under simulated microgravity. Further investigations demonstrated that lncRNA ODSM could promote MC3T3-E1 cell differentiation. Therefore, this research was the first to reveal the critical role of the lncRNA ODSM/miR-139-3p/ELK1 pathway in osteoblasts, and these findings suggest the potential value of miR-139-3p in osteoporosis diagnosis and therapy.
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Affiliation(s)
- Yixuan Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Ke Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Zebing Hu
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Hua Zhou
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Lijun Zhang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Han Wang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Gaozhi Li
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China
| | - Shu Zhang
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China.
| | - Xinsheng Cao
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China.
| | - Fei Shi
- The Key Laboratory of Aerospace Medicine, Ministry of Education, Air Force Medical University, Xi'an, Shaanxi, 710032, China.
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23
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Komori T. Runx2, an inducer of osteoblast and chondrocyte differentiation. Histochem Cell Biol 2018; 149:313-323. [DOI: 10.1007/s00418-018-1640-6] [Citation(s) in RCA: 231] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2018] [Indexed: 12/20/2022]
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24
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Zhu X, Wang Z, Zhao Y, Jiang C. Investigation of candidate genes and mechanisms underlying postmenopausal osteoporosis using bioinformatics analysis. Mol Med Rep 2018; 17:1561-1572. [PMID: 29138843 PMCID: PMC5780095 DOI: 10.3892/mmr.2017.8045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 10/06/2017] [Indexed: 12/28/2022] Open
Abstract
The present study aimed to determine candidate genes, chemicals and mechanisms underlying postmenopausal osteoporosis (PMOP). A gene expression profile (accession no. GSE68303), which included 12 tissue samples from ovariectomized mice (OVX group) and 11 normal tissue samples from sham surgery mice (control group), was downloaded from the Gene Expression Omnibus database. The identification of differentially expressed genes (DEGs), and Gene Ontology functional enrichment and Kyoto Encyclopedia of Genes and Genomes pathway analyses, was performed, followed by an investigation of protein‑protein interactions (PPI), PPI modules, transcription factors (TFs) and chemicals. A total of 784 upregulated and 729 downregulated DEGs between the two groups were identified. Furthermore, 2 upregulated modules and 6 downregulated modules were determined. The upregulated DEGs in modules were enriched in 'sensory perception of smell' function and 'olfactory transduction' pathway, and a number of genes belonging to the olfactory receptor (OLFR) family were identified in upregulated modules. The downregulated DEGs in modules were enriched in 'DNA replication initiation' function and 'cell cycle' pathway. A total of 8 TFs, including SP1 TF (SP1) and protein C‑ets‑1 (ETS1), were associated with PMOP. Furthermore, estradiol and resveratrol were identified as key chemicals in the chemical‑gene interaction network. Therefore, TFs, including SP1 and ETS1, in addition to members of the OLFR gene family, may be employed as novel targets for treatment of PMOP. Furthermore, functions including 'sensory perception of smell' and 'replication initiation', and 'olfactory transduction' and 'cell cycle' pathways, may serve roles in PMOP. In addition, based on the chemical‑gene interaction network, estradiol and resveratrol may also be considered for the treatment PMOP.
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Affiliation(s)
- Xiaozhong Zhu
- Department of Orthopedic Surgery, Tongji Hospital, Tongji University, Shanghai 200065, P.R. China
| | - Zhiyuan Wang
- Department of Orthopedic Surgery, Tongji Hospital, Tongji University, Shanghai 200065, P.R. China
| | - Yanxun Zhao
- Department of Orthopedic Surgery, Tongji Hospital, Tongji University, Shanghai 200065, P.R. China
| | - Chao Jiang
- Department of Orthopedic Surgery, Tongji Hospital, Tongji University, Shanghai 200065, P.R. China
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25
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Khalid AB, Slayden AV, Kumpati J, Perry CD, Osuna MAL, Arroyo SR, Miranda-Carboni GA, Krum SA. GATA4 Directly Regulates Runx2 Expression and Osteoblast Differentiation. JBMR Plus 2017; 2:81-91. [PMID: 30035248 PMCID: PMC6053063 DOI: 10.1002/jbm4.10027] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
GATA4 is a zinc‐finger transcription factor that is a pioneer factor in various tissues and regulates tissue‐specific gene regulation. In vivo deletion of Gata4 using Cre‐recombinase under the control of the Col1a1 2.3 kb promoter showed significantly reduced values for trabecular bone properties by microCT analysis of femur and tibia of 14‐week‐old male and female mice, suggesting GATA4 is necessary for maintaining normal adult bone phenotype. Quantitative PCR analysis revealed higher expression of Gata4 in trabecular bone compared with cortical bone, suggesting a role for GATA4 in maintaining normal trabecular bone mass. In vivo and in vitro, reduction of Gata4 correlates with reduced Runx2 gene expression, along with reduced osteoblast mineralization. To determine if Runx2 is a direct target of GATA4, chromatin immunoprecipitation (ChIP) was performed, and it demonstrated that GATA4 is recruited to the two Runx2 promoters and an enhancer region. Furthermore, when Gata4 is knocked down, the chromatin at the Runx2 region is not open, as detected by DNase assays and ChIP with antibodies to the open chromatin marks H3K4me2 (histone 3 lysine 4 dimethylation) and H3K27ac (histone 3 lysine 27 acetylation) and the closed chromatin mark H3K27me2 (histone 3 lysine 27 trimethylation). Together, the data suggest that GATA4 binds near the Runx2 promoter and enhancer and helps maintain open chromatin to regulate Runx2 expression leading to bone mineralization. © 2017 The Authors. JBMR Plus is published by Wiley Periodicals, Inc. on behalf of the American Society for Bone and Mineral Research.
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Affiliation(s)
- Aysha B Khalid
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Alexandria V Slayden
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Jerusha Kumpati
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Chanel D Perry
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Maria Angeles Lillo Osuna
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Samantha R Arroyo
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Gustavo A Miranda-Carboni
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA.,Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Susan A Krum
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
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MIF Plays a Key Role in Regulating Tissue-Specific Chondro-Osteogenic Differentiation Fate of Human Cartilage Endplate Stem Cells under Hypoxia. Stem Cell Reports 2017; 7:249-62. [PMID: 27509135 PMCID: PMC4982989 DOI: 10.1016/j.stemcr.2016.07.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/06/2016] [Accepted: 07/06/2016] [Indexed: 12/15/2022] Open
Abstract
Degenerative cartilage endplate (CEP) shows decreased chondrification and increased ossification. Cartilage endplate stem cells (CESCs), with the capacity for chondro-osteogenic differentiation, are responsible for CEP restoration. CEP is avascular and hypoxic, while the physiological hypoxia is disrupted in the degenerated CEP. Hypoxia promoted chondrogenesis but inhibited osteogenesis in CESCs. This tissue-specific differentiation fate of CESCs in response to hypoxia was physiologically significant with regard to CEP maintaining chondrification and refusing ossification. MIF, a downstream target of HIF1A, is involved in cartilage and bone metabolisms, although little is known about its regulatory role in differentiation. In CESCs, MIF was identified as a key point through which HIF1A regulated the chondro-osteogenic differentiation. Unexpectedly, unlike the traditionally recognized mode, increased nuclear-expressed MIF under hypoxia was identified to act as a transcriptional regulator by interacting with the promoter of SOX9 and RUNX2. This mode of HIF1A/MIF function may represent a target for CEP degeneration therapy. The hypoxic microenvironment is disrupted in degenerative CEP Hypoxia promotes chondrogenesis but inhibits osteogenesis in CESCs Hypoxia regulates chondro-osteogenesis through HIF1A/MIF pathway MIF acts as a transcriptional regulator under hypoxia
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Oh SH, Kim JW, Kim Y, Lee MN, Kook MS, Choi EY, Im SY, Koh JT. The extracellular matrix protein Edil3 stimulates osteoblast differentiation through the integrin α5β1/ERK/Runx2 pathway. PLoS One 2017; 12:e0188749. [PMID: 29182679 PMCID: PMC5705136 DOI: 10.1371/journal.pone.0188749] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 11/12/2017] [Indexed: 02/07/2023] Open
Abstract
Epidermal growth factor-like repeats and discoidin I-like domain 3 (Edil3) is an extracellular matrix protein containing an Arg-Gly-Asp (RGD) motif that binds integrin. Recently, Edil3 has been implicated in various biological processes, including angiogenesis and cellular differentiation. It can inhibit inflammatory bone destruction. The objective of this study was to explore the role of Edil3 in osteoblast differentiation and its underlying molecular mechanisms. In wild-type mice, high expression levels of Edil3 mRNA were observed in isolated calvaria and tibia/femur bones. Immunohistochemical analysis showed that Edil3 protein was localized along periosteum and calcified regions surrounding bone tissues. When murine calvaria-derived MC3T3-E1 cells were cultured in osteogenic medium containing 50 μg/ml ascorbic acid and 5 mM β-glycerophosphate, Edil3 mRNA and protein expression levels were increased. Treatment with Edil3 protein in growth media increased expression levels of alkaline phosphatase and osteocalcin gene and phosphorylation level of extracellular signal-regulated kinase (ERK). Edil3 treatment with osteogenic medium induced mineralization. Treatment with a neutralizing antibody against α5β1 and MEK inhibitor U0126 inhibited Edil3-enhanced osteogenic marker gene expression and mineral deposition. Edil3 increased protein expression levels of transcription factor runt-related transcription factor2 (Runx2). Edil3-induced Runx2 protein expression was suppressed by pretreatment with U0126. Taken together, these results suggest that Edil3 may stimulate osteoblast differentiation and matrix mineralization by increasing expression of Runx2 through α5β1 integrin /ERK pathway.
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Affiliation(s)
- Sin-Hye Oh
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Gwangju, Republic of Korea
| | - Jung-Woo Kim
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Yuri Kim
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Mi Nam Lee
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Min-Suk Kook
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Eun Young Choi
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Suhn-Young Im
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Gwangju, Republic of Korea
| | - Jeong-Tae Koh
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
- * E-mail:
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Kim J, Lee HW, Rhee DK, Paton JC, Pyo S. Pneumolysin-induced autophagy contributes to inhibition of osteoblast differentiation through downregulation of Sp1 in human osteosarcoma cells. Biochim Biophys Acta Gen Subj 2017; 1861:2663-2673. [PMID: 28713020 DOI: 10.1016/j.bbagen.2017.07.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND INFORMATION The 53kDa protein pneumolysin (PLY) is the main virulence factor of Streptococcus pneumoniae, a leading cause of invasive pneumococcal diseases. PLY forms pores in cholesterol-containing membranes, thereby interfering with the function of cells. Bone destruction is a serious matter in chronic inflammatory diseases such as septic arthritis and osteomyelitis. S. pneumoniae is increasingly being recognized as a common cause of septic arthritis, but its pathogenesis is poorly defined. METHOD We examined the effect of PLY on osteoblast differentiation and its mechanisms of action. The effect of PLY on osteoblast differentiation was evaluated by qRT-PCR, ALP activity assay, flow cytometric analysis, and Western blotting. We also examined the role of PLY-induced autophagy in osteoblast differentiation using RNA interference analysis. RESULTS PLY inhibited osteoblast differentiation by decreasing the expression of osteoblast marker genes such as Runx2 and OCN, along with ALP activity. ROS production was increased by PLY during osteoblast differentiation. PLY induced autophagy through ROS-mediated regulation of AMPK and mTOR, which downregulated the expression of Sp1 and subsequent inhibition of differentiation. Treatment with autophagy inhibitors or Atg5 siRNA alleviated the PLY-induced inhibition of differentiation. CONCLUSION The results suggest that PLY inhibits osteoblast differentiation by downregulation of Sp1 accompanied by induction of autophagy through ROS-mediated regulation of the AMPK/mTOR pathway. GENERAL SIGNIFICANCE This study proposes a molecular mechanism for inhibition of osteoblast differentiation in response to PLY.
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Affiliation(s)
- Jinwook Kim
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyunggi-do 16419, Republic of Korea
| | - Hee-Weon Lee
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyunggi-do 16419, Republic of Korea
| | - Dong Kwon Rhee
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyunggi-do 16419, Republic of Korea
| | - James C Paton
- School of Molecular and Biomedical Science, University of Adelaide, Adelaide, SA 5005, Australia
| | - Suhkneung Pyo
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyunggi-do 16419, Republic of Korea.
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29
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Zainabadi K, Liu CJ, Guarente L. SIRT1 is a positive regulator of the master osteoblast transcription factor, RUNX2. PLoS One 2017; 12:e0178520. [PMID: 28542607 PMCID: PMC5444833 DOI: 10.1371/journal.pone.0178520] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 05/15/2017] [Indexed: 11/25/2022] Open
Abstract
Activation of SIRT1 has previously been shown to protect mice against osteoporosis through yet ill-defined mechanisms. In this study, we outline a role for SIRT1 as a positive regulator of the master osteoblast transcription factor, RUNX2. We find that ex vivo deletion of sirt1 leads to decreased expression of runx2 downstream targets, but not runx2 itself, along with reduced osteoblast differentiation. Reciprocally, treatment with a SIRT1 agonist promotes osteoblast differentiation, as well as the expression of runx2 downstream targets, in a SIRT1-dependent manner. Biochemical and luciferase reporter assays demonstrate that SIRT1 interacts with and promotes the transactivation potential of RUNX2. Intriguingly, mice treated with the SIRT1 agonist, resveratrol, show similar increases in the expression of RUNX2 targets in their calvaria (bone tissue), validating SIRT1 as a physiologically relevant regulator of RUNX2.
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Affiliation(s)
- Kayvan Zainabadi
- Glenn Center for the Science of Aging, Department of Biology, Koch Institute, MIT, Cambridge, Massachusetts, United States of America
- * E-mail:
| | - Cassie J. Liu
- Glenn Center for the Science of Aging, Department of Biology, Koch Institute, MIT, Cambridge, Massachusetts, United States of America
| | - Leonard Guarente
- Glenn Center for the Science of Aging, Department of Biology, Koch Institute, MIT, Cambridge, Massachusetts, United States of America
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30
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Hu J, Mao Z, He S, Zhan Y, Ning R, Liu W, Yan B, Yang J. Icariin protects against glucocorticoid induced osteoporosis, increases the expression of the bone enhancer DEC1 and modulates the PI3K/Akt/GSK3β/β-catenin integrated signaling pathway. Biochem Pharmacol 2017; 136:109-121. [PMID: 28408345 DOI: 10.1016/j.bcp.2017.04.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 04/07/2017] [Indexed: 12/13/2022]
Abstract
Osteoporosis is a serious public health concern worldwide. Herba epimedii has been used for centuries and even thousands of years to treat osteoporotic conditions. Icariin, a flavonol glycoside, is one of the major active ingredients. In this study, we have shown that icariin protected against glucocorticoid-induced osteoporotic changes in SaoS-2 cells and mice. We have also shown that dexamethasone (a glucocorticoid) suppressed and icariin induced DEC1, a structurally distinct helix-loop-helix protein. DEC1 overexpression promoted whereas DEC1 knockdown decreased osteogenic activity. Likewise, DEC1 overexpression and knockdown inversely regulated the expression of β-catenin and PIK3CA, an essential player in the Wnt/β-catenin and PI3K/Akt signaling pathways, respectively. Interestingly, DKK1, an inhibitor of Wnt/β-catenin signaling inhibitor, and LY294002, an inhibitor of PI3K/Akt signaling, abolished the induction of DEC1 by icariin. It is established that these two pathways are interconnected by the phosphorylation status of GSK3β. Dexamethasone decreased but icariin increased GSK3β phosphorylation. Finally, DEC1 deficient mice developed osteoporotic phenotypes. Taken together, it is concluded that DEC1 likely supports the action of icariin against glucocorticoid induced osteoporosis with an involvement of the PI3K/Akt/GSK3β/β-catenin integrated signaling pathway.
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Affiliation(s)
- Jinhua Hu
- Pharmaceutical Preparation Section, Changzhou No. 7 People's Hospital, Changzhou 213000, China
| | - Zhao Mao
- Jinling Hospital, Nanjing Medical University, Nanjing 210029, China
| | - Shuangcheng He
- Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China
| | - Yuanran Zhan
- Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China
| | - Rui Ning
- Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China
| | - Wei Liu
- Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China
| | | | - Jian Yang
- Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China.
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Abstract
Runx2 is the most upstream transcription factor essential for osteoblast differentiation. It regulates the expression of Sp7, the protein of which is a crucial transcription factor for osteoblast differentiation, as well as that of bone matrix genes including Spp1, Ibsp, and Bglap2. Runx2 is also required for chondrocyte maturation, and Runx3 has a redundant function with Runx2 in chondrocyte maturation. Runx2 regulates the expression of Col10a1, Spp1, Ibsp, and Mmp13 in chondrocytes. It also inhibits chondrocytes from acquiring the phenotypes of permanent cartilage chondrocytes. It regulates chondrocyte proliferation through the regulation of Ihh expression. Runx2 enhances osteoclastogenesis by regulating Rankl. Cbfb, which is a co-transcription factor for Runx family proteins, plays an important role in skeletal development by stabilizing Runx family proteins. In Cbfb isoforms, Cbfb1 is more potent than Cbfb2 in Runx2-dependent transcriptional regulation; however, the expression level of Cbfb2 is three-fold higher than that of Cbfb1, demonstrating the requirement of Cbfb2 in skeletal development. The expression of Runx2 in osteoblasts is regulated by a 343-bp enhancer located upstream of the P1 promoter. This enhancer is activated by an enhanceosome composed of Dlx5/6, Mef2, Tcf7, Ctnnb1, Sox5/6, Smad1, and Sp7. Thus, Runx2 is a multifunctional transcription factor that is essential for skeletal development, and Cbfb regulates skeletal development by modulating the stability and transcriptional activity of Runx family proteins.
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Acevedo-Luna N, Mariño-Ramírez L, Halbert A, Hansen U, Landsman D, Spouge JL. Most of the tight positional conservation of transcription factor binding sites near the transcription start site reflects their co-localization within regulatory modules. BMC Bioinformatics 2016; 17:479. [PMID: 27871221 PMCID: PMC5117513 DOI: 10.1186/s12859-016-1354-5] [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: 05/31/2016] [Accepted: 11/11/2016] [Indexed: 11/24/2022] Open
Abstract
Background Transcription factors (TFs) form complexes that bind regulatory modules (RMs) within DNA, to control specific sets of genes. Some transcription factor binding sites (TFBSs) near the transcription start site (TSS) display tight positional preferences relative to the TSS. Furthermore, near the TSS, RMs can co-localize TFBSs with each other and the TSS. The proportion of TFBS positional preferences due to TFBS co-localization within RMs is unknown, however. ChIP experiments confirm co-localization of some TFBSs genome-wide, including near the TSS, but they typically examine only a few TFs at a time, using non-physiological conditions that can vary from lab to lab. In contrast, sequence analysis can examine many TFs uniformly and methodically, broadly surveying the co-localization of TFBSs with tight positional preferences relative to the TSS. Results Our statistics found 43 significant sets of human motifs in the JASPAR TF Database with positional preferences relative to the TSS, with 38 preferences tight (±5 bp). Each set of motifs corresponded to a gene group of 135 to 3304 genes, with 42/43 (98%) gene groups independently validated by DAVID, a gene ontology database, with FDR < 0.05. Motifs corresponding to two TFBSs in a RM should co-occur more than by chance alone, enriching the intersection of the gene groups corresponding to the two TFs. Thus, a gene-group intersection systematically enriched beyond chance alone provides evidence that the two TFs participate in an RM. Of the 903 = 43*42/2 intersections of the 43 significant gene groups, we found 768/903 (85%) pairs of gene groups with significantly enriched intersections, with 564/768 (73%) intersections independently validated by DAVID with FDR < 0.05. A user-friendly web site at http://go.usa.gov/3kjsH permits biologists to explore the interaction network of our TFBSs to identify candidate subunit RMs. Conclusions Gene duplication and convergent evolution within a genome provide obvious biological mechanisms for replicating an RM near the TSS that binds a particular TF subunit. Of all intersections of our 43 significant gene groups, 85% were significantly enriched, with 73% of the significant enrichments independently validated by gene ontology. The co-localization of TFBSs within RMs therefore likely explains much of the tight TFBS positional preferences near the TSS. Electronic supplementary material The online version of this article (doi:10.1186/s12859-016-1354-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Natalia Acevedo-Luna
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA, 50011, USA
| | - Leonardo Mariño-Ramírez
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Armand Halbert
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Ulla Hansen
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA, 02215, USA
| | - David Landsman
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD, 20894, USA
| | - John L Spouge
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD, 20894, USA.
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Yu S, Yerges-Armstrong LM, Chu Y, Zmuda JM, Zhang Y. Transcriptional Regulation of Frizzled-1 in Human Osteoblasts by Sp1. PLoS One 2016; 11:e0163277. [PMID: 27695039 PMCID: PMC5047477 DOI: 10.1371/journal.pone.0163277] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 09/05/2016] [Indexed: 02/03/2023] Open
Abstract
The wingless pathway has a powerful influence on bone metabolism and is a therapeutic target in skeletal disorders. Wingless signaling is mediated in part through the Frizzled (FZD) receptor family. FZD transcriptional regulation is poorly understood. Herein we tested the hypothesis that Sp1 plays an important role in the transcriptional regulation of FZD1 expression in osteoblasts and osteoblast mineralization. To test this hypothesis, we conducted FZD1 promoter assays in Saos2 cells with and without Sp1 overexpression. We found that Sp1 significantly up-regulates FZD1 promoter activity in Saos2 cells. Chromatin immunoprecipitation (ChIP) and electrophoretic mobility shift (EMSA) assays identified a novel and functional Sp1 binding site at -44 to -40 from the translation start site in the FZD1 promoter. The Sp1-dependent activation of the FZD1 promoter was abolished by mithramycin A (MMA), an antibiotic affecting both Sp1 binding and Sp1 protein levels in Saos2 cells. Similarly, down-regulation of Sp1 in hFOB cells resulted in less FZD1 expression and lower alkaline phosphatase activity. Moreover, over-expression of Sp1 increased FZD1 expression and Saos2 cell mineralization while MMA decreased Sp1 and FZD1 expression and Saos2 cell mineralization. Knockdown of FZD1 prior to Sp1 overexpression partially abolished Sp1 stimulation of osteoblast differentiation markers. Taken together, our results suggest that Sp1 plays a role in human osteoblast differentiation and mineralization, which is at least partially mediated by Sp1-dependent transactivation of FZD1.
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Affiliation(s)
- Shibing Yu
- Department of Medicine, School of Medicine, University of Pittsburgh, Pennsylvania, United States of America
| | - Laura M. Yerges-Armstrong
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pennsylvania, United States of America
- Program in Personalized and Genomic Medicine and Department of Medicine, Division of Endocrinology, Diabetes and Nutrition, School of Medicine, University of Maryland, College Park, Maryland, United States of America
| | - Yanxia Chu
- Department of Medicine, School of Medicine, University of Pittsburgh, Pennsylvania, United States of America
| | - Joseph M. Zmuda
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pennsylvania, United States of America
- Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pennsylvania, United States of America
| | - Yingze Zhang
- Department of Medicine, School of Medicine, University of Pittsburgh, Pennsylvania, United States of America
- Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pennsylvania, United States of America
- * E-mail:
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34
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Mansell J, Cooke M, Read M, Rudd H, Shiel A, Wilkins K, Manso M. Chitinase 3-like 1 expression by human (MG63) osteoblasts in response to lysophosphatidic acid and 1,25-dihydroxyvitamin D3. Biochimie 2016; 128-129:193-200. [DOI: 10.1016/j.biochi.2016.08.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 08/25/2016] [Indexed: 01/05/2023]
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35
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Rajput P, Pandey V, Kumar V. Stimulation of ribosomal RNA gene promoter by transcription factor Sp1 involves active DNA demethylation by Gadd45-NER pathway. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1859:953-63. [PMID: 27156884 DOI: 10.1016/j.bbagrm.2016.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 04/23/2016] [Accepted: 05/04/2016] [Indexed: 01/29/2023]
Abstract
The well-studied Pol II transcription factor Sp1 has not been investigated for its regulatory role in rDNA transcription. Here, we show that Sp1 bound to specific sites on rDNA and localized into the nucleoli during the G1 phase of cell cycle to activate rDNA transcription. It facilitated the recruitment of Pol I pre-initiation complex and impeded the binding of nucleolar remodeling complex (NoRC) to rDNA resulting in the formation of euchromatin active state. More importantly, Sp1 also orchestrated the site-specific binding of Gadd45a-nucleotide excision repair (NER) complex resulting in active demethylation and transcriptional activation of rDNA. Interestingly, knockdown of Sp1 impaired rDNA transcription due to reduced engagement of the Gadd45a-NER complex and hypermethylation of rDNA. Thus, the present study unveils a novel role of Sp1 in rDNA transcription involving promoter demethylation.
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MESH Headings
- A549 Cells
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- Cell Nucleolus/metabolism
- DNA Methylation
- DNA Repair
- DNA, Ribosomal/genetics
- DNA, Ribosomal/metabolism
- Epigenesis, Genetic
- Euchromatin/chemistry
- Euchromatin/metabolism
- G1 Phase
- Genes, Reporter
- Green Fluorescent Proteins/genetics
- Green Fluorescent Proteins/metabolism
- HCT116 Cells
- HEK293 Cells
- Humans
- Nuclear Proteins/genetics
- Nuclear Proteins/metabolism
- Promoter Regions, Genetic
- RNA, Ribosomal/genetics
- RNA, Ribosomal/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Signal Transduction
- Sp1 Transcription Factor/antagonists & inhibitors
- Sp1 Transcription Factor/genetics
- Sp1 Transcription Factor/metabolism
- Transcription, Genetic
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Affiliation(s)
- Pallavi Rajput
- Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Vijaya Pandey
- Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Vijay Kumar
- Virology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi-110067, India.
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36
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Carr FE, Tai PWL, Barnum MS, Gillis NE, Evans KG, Taber TH, White JH, Tomczak JA, Jaworski DM, Zaidi SK, Lian JB, Stein JL, Stein GS. Thyroid Hormone Receptor-β (TRβ) Mediates Runt-Related Transcription Factor 2 (Runx2) Expression in Thyroid Cancer Cells: A Novel Signaling Pathway in Thyroid Cancer. Endocrinology 2016; 157:3278-92. [PMID: 27253998 PMCID: PMC4967127 DOI: 10.1210/en.2015-2046] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Dysregulation of the thyroid hormone receptor (TR)β is common in human cancers. Restoration of functional TRβ delays tumor progression in models of thyroid and breast cancers implicating TRβ as a tumor suppressor. Conversely, aberrant expression of the runt-related transcription factor 2 (Runx2) is established in the progression and metastasis of thyroid, breast, and other cancers. Silencing of Runx2 diminishes tumor invasive characteristics. With TRβ as a tumor suppressor and Runx2 as a tumor promoter, a compelling question is whether there is a functional relationship between these regulatory factors in thyroid tumorigenesis. Here, we demonstrated that these proteins are reciprocally expressed in normal and malignant thyroid cells; TRβ is high in normal cells, and Runx2 is high in malignant cells. T3 induced a time- and concentration-dependent decrease in Runx2 expression. Silencing of TRβ by small interfering RNA knockdown resulted in a corresponding increase in Runx2 and Runx2-regulated genes, indicating that TRβ levels directly impact Runx2 expression and associated epithelial to mesenchymal transition molecules. TRβ specifically bound to 3 putative thyroid hormone-response element motifs within the Runx2-P1 promoter ((-)105/(+)133) as detected by EMSA and chromatin immunoprecipitation. TRβ suppressed Runx2 transcriptional activities, thus confirming TRβ regulation of Runx2 at functional thyroid hormone-response elements. Significantly, these findings indicate that a ratio of the tumor-suppressor TRβ and tumor-promoting Runx2 may reflect tumor aggression and serve as biomarkers in biopsy tissues. The discovery of this TRβ-Runx2 signaling supports the emerging role of TRβ as a tumor suppressor and reveals a novel pathway for intervention.
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Affiliation(s)
- Frances E Carr
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Phillip W L Tai
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Michael S Barnum
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Noelle E Gillis
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Katherine G Evans
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Thomas H Taber
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Jeffrey H White
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Jennifer A Tomczak
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Diane M Jaworski
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Sayyed K Zaidi
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Jane B Lian
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Janet L Stein
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
| | - Gary S Stein
- Departments of Pharmacology (F.E.C., M.S.B., N.E.G., K.G.E., T.H.T., J.H.W., J.A.T.), Biochemistry (P.W.L.T., S.K.Z., J.B.L., J.L.S., G.S.S.), and Neurological Sciences (D.M.J.), College of Medicine, University of Vermont, Burlington, Vermont 05405
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37
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Varela N, Aranguiz A, Lizama C, Sepulveda H, Antonelli M, Thaler R, Moreno RD, Montecino M, Stein GS, van Wijnen AJ, Galindo M. Mitotic Inheritance of mRNA Facilitates Translational Activation of the Osteogenic-Lineage Commitment Factor Runx2 in Progeny of Osteoblastic Cells. J Cell Physiol 2016; 231:1001-14. [PMID: 26381402 PMCID: PMC5812339 DOI: 10.1002/jcp.25188] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/03/2015] [Indexed: 12/24/2022]
Abstract
Epigenetic mechanisms mediate the acquisition of specialized cellular phenotypes during tissue development, maintenance and repair. When phenotype-committed cells transit through mitosis, chromosomal condensation counteracts epigenetic activation of gene expression. Subsequent post-mitotic re-activation of transcription depends on epigenetic DNA and histone modifications, as well as other architecturally bound proteins that "bookmark" the genome. Osteogenic lineage commitment, differentiation and progenitor proliferation require the bone-related runt-related transcription factor Runx2. Here, we characterized a non-genomic mRNA mediated mechanism by which osteoblast precursors retain their phenotype during self-renewal. We show that osteoblasts produce maximal levels of Runx2 mRNA, but not protein, prior to mitotic cell division. Runx2 mRNA partitions symmetrically between daughter cells in a non-chromosomal tubulin-containing compartment. Subsequently, transcription-independent de novo synthesis of Runx2 protein in early G1 phase results in increased functional interactions of Runx2 with a representative osteoblast-specific target gene (osteocalcin/BGLAP2) in chromatin. Somatic transmission of Runx2 mRNAs in osteoblasts and osteosarcoma cells represents a versatile mechanism for translational rather than transcriptional induction of this principal gene regulator to maintain osteoblast phenotype identity after mitosis.
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Affiliation(s)
- Nelson Varela
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Santiago, Chile
- Department of Medical Technology, Faculty of Medicine, University of Chile, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, University of Chile, Santiago, Chile
| | - Alejandra Aranguiz
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, University of Chile, Santiago, Chile
| | - Carlos Lizama
- Department of Physiology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Hugo Sepulveda
- Center for Biomedical Research and FONDAP Center for Genome Regulation, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, Chile
| | - Marcelo Antonelli
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Roman Thaler
- Departments of Orthopedic Surgery & Biochemistry and Molecular Biology, Mayo Clinic, 200 First Street S.W., MSB 3-69, Rochester, MN 55905
| | - Ricardo D. Moreno
- Department of Physiology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Martin Montecino
- Center for Biomedical Research and FONDAP Center for Genome Regulation, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, Chile
| | - Gary S. Stein
- Department of Biochemistry, HSRF 326, Vermont Cancer Center for Basic and Translational Research, University of Vermont Medical School, Burlington, VT
| | - Andre J. van Wijnen
- Departments of Orthopedic Surgery & Biochemistry and Molecular Biology, Mayo Clinic, 200 First Street S.W., MSB 3-69, Rochester, MN 55905
| | - Mario Galindo
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, University of Chile, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, University of Chile, Santiago, Chile
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38
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Use of RUNX2 expression to identify osteogenic progenitor cells derived from human embryonic stem cells. Stem Cell Reports 2015; 4:190-8. [PMID: 25680477 PMCID: PMC4325195 DOI: 10.1016/j.stemcr.2015.01.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 01/12/2015] [Accepted: 01/12/2015] [Indexed: 12/22/2022] Open
Abstract
We generated a RUNX2-yellow fluorescent protein (YFP) reporter system to study osteogenic development from human embryonic stem cells (hESCs). Our studies demonstrate the fidelity of YFP expression with expression of RUNX2 and other osteogenic genes in hESC-derived osteoprogenitor cells, as well as the osteogenic specificity of YFP signal. In vitro studies confirm that the hESC-derived YFP+ cells have similar osteogenic phenotypes to osteoprogenitor cells generated from bone-marrow mesenchymal stem cells. In vivo studies demonstrate the hESC-derived YFP+ cells can repair a calvarial defect in immunodeficient mice. Using the engineered hESCs, we monitored the osteogenic development and explored the roles of osteogenic supplements BMP2 and FGF9 in osteogenic differentiation of these hESCs in vitro. Taken together, this reporter system provides a novel system to monitor the osteogenic differentiation of hESCs and becomes useful to identify soluble agents and cell signaling pathways that mediate early stages of human bone development. This reporter system represents RUNX2 expression in osteogenic differentiated hESCs This system can be used to identify stages of osteogenic development of hESCs BMP2 alone does not induce osteogenic differentiation of hESCs in vitro
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39
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Rojas A, Aguilar R, Henriquez B, Lian JB, Stein JL, Stein GS, van Wijnen AJ, van Zundert B, Allende ML, Montecino M. Epigenetic Control of the Bone-master Runx2 Gene during Osteoblast-lineage Commitment by the Histone Demethylase JARID1B/KDM5B. J Biol Chem 2015; 290:28329-28342. [PMID: 26453309 DOI: 10.1074/jbc.m115.657825] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Indexed: 12/30/2022] Open
Abstract
Transcription factor Runx2 controls bone development and osteoblast differentiation by regulating expression of a significant number of bone-related target genes. Here, we report that transcriptional activation and repression of the Runx2 gene via its osteoblast-specific P1 promoter (encoding mRNA for the Runx2/p57 isoform) is accompanied by selective deposition and elimination of histone marks during differentiation of mesenchymal cells to the osteogenic and myoblastic lineages. These epigenetic profiles are mediated by key components of the Trithorax/COMPASS-like and Polycomb group complexes together with histone arginine methylases like PRMT5 and lysine demethylases like JARID1B/KDM5B. Importantly, knockdown of the H3K4me2/3 demethylase JARID1B, but not of the demethylases UTX and NO66, prevents repression of the Runx2 P1 promoter during myogenic differentiation of mesenchymal cells. The epigenetically forced expression of Runx2/p57 and osteocalcin, a classical bone-related target gene, under myoblastic-differentiation is accompanied by enrichment of the H3K4me3 and H3K27ac marks at the Runx2 P1 promoter region. Our results identify JARID1B as a key component of a potent epigenetic switch that controls mesenchymal cell fate into myogenic and osteogenic lineages.
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Affiliation(s)
- Adriana Rojas
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, 8370146, Chile; Faculty of Sciences, Universidad de Chile, Santiago, 7800003, Chile; FONDAP Center for Genome Regulation, Santiago, Chile
| | - Rodrigo Aguilar
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, 8370146, Chile; FONDAP Center for Genome Regulation, Santiago, Chile
| | - Berta Henriquez
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, 8370146, Chile
| | - Jane B Lian
- University of Vermont Medical School, Burlington, Vermont 05405
| | - Janet L Stein
- University of Vermont Medical School, Burlington, Vermont 05405
| | - Gary S Stein
- University of Vermont Medical School, Burlington, Vermont 05405
| | | | - Brigitte van Zundert
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, 8370146, Chile
| | - Miguel L Allende
- Faculty of Sciences, Universidad de Chile, Santiago, 7800003, Chile; FONDAP Center for Genome Regulation, Santiago, Chile
| | - Martin Montecino
- Center for Biomedical Research, Faculty of Biological Sciences and Faculty of Medicine, Universidad Andres Bello, Santiago, 8370146, Chile; FONDAP Center for Genome Regulation, Santiago, Chile.
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40
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Zhang J, Lin H, Liu H, Zhang L, Yuan G, Chen Z. SP1 promotes the odontoblastic differentiation of dental papilla cells. Dev Growth Differ 2015; 57:400-407. [DOI: 10.1111/dgd.12221] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/08/2015] [Accepted: 04/13/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Jie Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Heng Lin
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Huan Liu
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Lu Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Guohua Yuan
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Zhi Chen
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
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41
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Sancisi V, Gandolfi G, Ambrosetti DC, Ciarrocchi A. Histone Deacetylase Inhibitors Repress Tumoral Expression of the Proinvasive Factor RUNX2. Cancer Res 2015; 75:1868-82. [PMID: 25769725 DOI: 10.1158/0008-5472.can-14-2087] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 01/20/2015] [Indexed: 11/16/2022]
Abstract
Aberrant reactivation of embryonic pathways occurs commonly in cancer. The transcription factor RUNX2 plays a fundamental role during embryogenesis and is aberrantly reactivated during progression and metastasization of different types of human tumors. In this study, we attempted to dissect the molecular mechanisms governing RUNX2 expression and its aberrant reactivation. We identified a new regulatory enhancer element, located within the RUNX2 gene, which is responsible for the activation of the RUNX2 promoter and for the regulation of its expression in cancer cells. Furthermore, we have shown that treatment with the anticancer compounds histone deacetylase inhibitor (HDACi) results in a profound inhibition of RUNX2 expression, which is determined by the disruption of the transcription-activating complex on the identified enhancer. These data envisage a possible targeting strategy to counteract the oncongenic function of RUNX2 in cancer cells and provide evidence that the cytotoxic activity of HDACi in cancer is not only dependent on the reactivation of silenced oncosuppressors but also on the repression of oncogenic factors that are necessary for survival and progression.
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Affiliation(s)
- Valentina Sancisi
- Laboratory of Translational Research, Research and Statistic Infrastructure, Arcispedale S. Maria Nuova-IRCCS, Reggio Emilia, Italy.
| | - Greta Gandolfi
- Laboratory of Translational Research, Research and Statistic Infrastructure, Arcispedale S. Maria Nuova-IRCCS, Reggio Emilia, Italy
| | - Davide Carlo Ambrosetti
- Laboratory of Molecular Biology, Department of Pharmacology and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - Alessia Ciarrocchi
- Laboratory of Translational Research, Research and Statistic Infrastructure, Arcispedale S. Maria Nuova-IRCCS, Reggio Emilia, Italy.
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42
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Kawane T, Komori H, Liu W, Moriishi T, Miyazaki T, Mori M, Matsuo Y, Takada Y, Izumi S, Jiang Q, Nishimura R, Kawai Y, Komori T. Dlx5 and mef2 regulate a novel runx2 enhancer for osteoblast-specific expression. J Bone Miner Res 2014; 29:1960-9. [PMID: 24692107 DOI: 10.1002/jbmr.2240] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 03/02/2014] [Accepted: 03/12/2014] [Indexed: 11/06/2022]
Abstract
Runx2 is essential for osteoblast differentiation and chondrocyte maturation. The expression of Runx2 is the first requisite step for the lineage determination from mesenchymal stem cells to osteoblasts. Although the transcript from Runx2 distal promoter is majorly expressed in osteoblasts, the promoter failed to direct green fluorescent protein (GFP) expression to osteoblasts. To find the regulatory region, we generated GFP reporter mice driven by a bacterial artificial chromosome (BAC) of Runx2 locus, and succeeded in the reproduction of endogenous Runx2 expression. By serially deleting it, we identified a 343-bp enhancer, which directed GFP expression specifically to osteoblasts, about 30 kb upstream of the distal promoter. The sequence of the 343-bp enhancer was highly conserved among mouse, human, dog, horse, opossum, and chicken. Dlx5, Mef2c, Tcf7, Ctnnb1, Sp7, Smad1, and Sox6, which localized on the enhancer region in primary osteoblasts, synergistically upregulated the enhancer activity, whereas Msx2 downregulated the activity in mouse osteoblastic MC3T3-E1 cells. Msx2 was predominantly bound to the enhancer in mouse multipotent mesenchymal C3H10T1/2 cells, whereas Dlx5 was predominantly bound to the enhancer in MC3T3-E1 cells. Dlx5 and Mef2 directly bound to the enhancer, and the binding sites were required for the osteoblast-specific expression in mice, whereas the other factors bound to the enhancer by protein-protein interaction. The enhancer was characterized by the presence of the histone variant H2A.Z, the enrichment of histone H3 mono- and dimethylated at Lys4 and acetylated at Lys18 and Lys27, but the depletion of histone H3 trimethylated at Lys4 in primary osteoblasts. These findings indicated that the enhancer, which had typical histone modifications for enhancers, contains sufficient elements to direct Runx2 expression to osteoblasts, and that Dlx5 and Mef2, which formed an enhanceosome with Tcf7, Ctnnb1, Sp7, Smad1, and Sox6, play an essential role in the osteoblast-specific activation of the enhancer. © 2014 American Society for Bone and Mineral Research.
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Affiliation(s)
- Tetsuya Kawane
- Department of Cell Biology, Unit of Basic Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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43
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Tai PWL, Wu H, Gordon JAR, Whitfield TW, Barutcu AR, van Wijnen AJ, Lian JB, Stein GS, Stein JL. Epigenetic landscape during osteoblastogenesis defines a differentiation-dependent Runx2 promoter region. Gene 2014; 550:1-9. [PMID: 24881813 DOI: 10.1016/j.gene.2014.05.044] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 05/21/2014] [Indexed: 12/11/2022]
Abstract
Runx2 is a developmentally regulated gene in vertebrates and is essential for bone formation and skeletal homeostasis. The induction of runx2-P1 isoform transcripts is a hallmark of early osteoblastogenesis. Although previous in vitro studies have defined a minimal Runx2-P1 promoter sequence with well-characterized functional elements, several lines of evidence suggest that transcription of the Runx2-P1 isoform relies on elements that extend beyond the previously defined P1 promoter boundaries. In this study, we examined Runx2-P1 transcriptional regulation in a cellular in vivo context during early osteoblastogenesis of MC3T3-E1 cultures and BMSCs induced towards the bone lineage by multi-layered analysis of the Runx2-P1 gene promoter using the following methodologies: 1) sequence homology among several mammalian species, 2) DNaseI hypersensitivity coupled with massively parallel sequencing (DNase-seq), and 3) chromatin immunoprecipitation of activating histone modifications coupled with massively parallel sequencing (ChIP-seq). These epigenetic features have allowed the demarcation of boundaries that redefine the minimal Runx2-P1 promoter to include a 336-bp sequence that mediates responsiveness to osteoblast differentiation. We also find that an additional level of control is contributed by a regulatory region in the 5'-UTR of Runx2-P1.
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Affiliation(s)
- Phillip W L Tai
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
| | - Hai Wu
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
| | - Jonathan A R Gordon
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
| | - Troy W Whitfield
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655-0002, USA.
| | - A Rasim Barutcu
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655-0002, USA.
| | | | - Jane B Lian
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
| | - Gary S Stein
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
| | - Janet L Stein
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.
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44
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Lin SS, Ueng SWN, Niu CC, Yuan LJ, Yang CY, Chen WJ, Lee MS, Chen JK. Hyperbaric oxygen promotes osteogenic differentiation of bone marrow stromal cells by regulating Wnt3a/β-catenin signaling--an in vitro and in vivo study. Stem Cell Res 2014; 12:260-74. [PMID: 24291646 DOI: 10.1016/j.scr.2013.10.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 10/09/2013] [Accepted: 10/23/2013] [Indexed: 11/25/2022] Open
Abstract
We hypothesized that the effect of hyperbaric oxygen (HBO) on bone formation is increased via osteogenic differentiation of bone marrow stromal cells (BMSCs), which is regulated by Wnt3a/β-catenin signaling. Our in vitro data showed that HBO increased cell proliferation, Wnt3a production, LRP6 phosphorylation, and cyclin D1 expression in osteogenically differentiated BMSCs. The mRNA and protein levels of Wnt3a, β-catenin, and Runx2 were upregulated while those of GSK-3β were downregulated after HBO treatment. The relative density ratio (phospho-protein/protein) of Akt and GSK-3β was both up-regulated while that of β-catenin was down-regulated after HBO treatment. We next investigated whether HBO affects the accumulation of β-catenin. Our Western blot analysis showed increased levels of translocated β-catenin that stimulated the expression of target genes after HBO treatment. HBO increased TCF-dependent transcription, Runx2 promoter/Luc gene activity, and the expression of osteogenic markers of BMSCs, such as alkaline phosphatase activity, type I collagen, osteocalcin, calcium, and the intensity of Alizarin Red staining. HBO dose dependently increased the bone morphogenetic protein (BMP2) and osterix production. We further demonstrated that HBO increased the expression of vacuolar-ATPases, which stimulated Wnt3a secretion from BMSCs. Finally, we showed that the beneficial effects of HBO on bone formation were related to Wnt3a/β-catenin signaling in a rabbit model by histology, mechanical testing, and immunohistochemical assays. Accordingly, we concluded that HBO increased the osteogenic differentiation of BMSCs by regulating Wnt3a secretion and signaling.
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Affiliation(s)
- Song-Shu Lin
- Institute of Biomedical Sciences, Chang Gung University, Taoyuan, Taiwan; Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Steve W N Ueng
- Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Chi-Chien Niu
- Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Li-Jen Yuan
- Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Chuen-Yung Yang
- Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Wen-Jer Chen
- Department of Orthopaedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Mel S Lee
- Department of Orthopaedics, Chang Gung Memorial Hospital, Chiayi, Taiwan
| | - Jan-Kan Chen
- Department of Physiology, Chang Gung University, Taoyuan, Taiwan.
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45
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Hekmatnejad B, Gauthier C, St-Arnaud R. Control of Fiat (factor inhibiting ATF4-mediated transcription) expression by Sp family transcription factors in osteoblasts. J Cell Biochem 2013; 114:1863-70. [PMID: 23463631 DOI: 10.1002/jcb.24528] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Accepted: 02/21/2013] [Indexed: 12/16/2022]
Abstract
FIAT (factor inhibiting ATF4-mediated transcription) represses Osteocalcin gene transcription and inhibits osteoblast activity by heterodimerizing with ATF4 to prevent it from binding DNA. It thus appears important to identify and characterize the molecular mechanisms that control Fiat gene expression in osteoblasts. In silico sequence analysis identified a canonical GC-box within a 1,400 bp region of the proximal Fiat gene promoter. Electrophoretic mobility shift assays (EMSA) with MC3T3-E1 osteoblastic cells nuclear extracts indicated that the transcription factors Sp1 and Sp3, but not Sp7/OSTERIX, bound this proximal GC-box. Chromatin immunoprecipitation confirmed interaction of the two transcription factors with the Fiat promoter GC-element in living osteoblasts. Transient transfection studies showed that Sp1 dose-dependently activated the expression of a Fiat-luciferase reporter construct while both the long or short isoforms of Sp3 dose-dependently inhibited transcription from the Fiat reporter construct. Transfection of an Sp7/OSTERIX expression vector did not affect expression of the Fiat-luciferase reporter. Co-transfection of increasing amounts of the Sp3 expression vector in the context of maximal Sp1-dependent Fiat-luciferase activation led to dose-dependent repression of the expression of the reporter. Using RNA knockdown, we measured a reduction in steady-state Fiat expression when Sp1 was inhibited, and a reciprocal increase upon Sp3 knockdown. In parallel, treatment of osteoblasts with WP631, which prevents Sp1/DNA interactions, strongly inhibited the expression of Fiat and reduced the occupancy of the Fiat promoter proximal GC-box by Sp1. Taken together, our results suggest an interplay between Sp1 and Sp3 as a mechanism involved in the control of Fiat gene expression in osteoblasts.
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Affiliation(s)
- Bahareh Hekmatnejad
- Genetics Unit, Shriners Hospitals for Children-Canada, Montreal, Quebec, Canada H3G 1A6
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Syddall CM, Reynard LN, Young DA, Loughlin J. The identification of trans-acting factors that regulate the expression of GDF5 via the osteoarthritis susceptibility SNP rs143383. PLoS Genet 2013; 9:e1003557. [PMID: 23825960 PMCID: PMC3694828 DOI: 10.1371/journal.pgen.1003557] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 04/24/2013] [Indexed: 02/03/2023] Open
Abstract
rs143383 is a C to T transition SNP located in the 5′untranslated region (5′UTR) of the growth differentiation factor 5 gene GDF5. The T allele of the SNP is associated with increased risk of osteoarthritis (OA) in Europeans and in Asians. This susceptibility is mediated by the T allele producing less GDF5 transcript relative to the C allele, a phenomenon known as differential allelic expression (DAE). The aim of this study was to identify trans-acting factors that bind to rs143383 and which regulate this GDF5 DAE. Protein binding to the gene was investigated by two experimental approaches: 1) competition and supershift electrophoretic mobility shift assays (EMSAs) and 2) an oligonucleotide pull down assay followed by quantitative mass spectrometry. Binding was then confirmed in vivo by chromatin immunoprecipitation (ChIP), and the functional effects of candidate proteins investigated by RNA interference (RNAi) and over expression. Using these approaches the trans-acting factors Sp1, Sp3, P15, and DEAF-1 were identified as interacting with the GDF5 5′UTR. Knockdown and over expression of the factors demonstrated that Sp1, Sp3, and DEAF-1 are repressors of GDF5 expression. Depletion of DEAF-1 modulated the DAE of GDF5 and this differential allelic effect was confirmed following over expression, with the rs143383 T allele being repressed to a significantly greater extent than the rs143383 C allele. In combination, Sp1 and DEAF-1 had the greatest repressive activity. In conclusion, we have identified four trans-acting factors that are binding to GDF5, three of which are modulating GDF5 expression via the OA susceptibility locus rs143383. GDF5 is an important growth factor that plays a vital role in the development and repair of articulating joints. rs143383 is a polymorphism within the regulatory region of the GDF5 gene and has two allelic forms, C and T. Genetic studies have demonstrated that the T allele is associated with an increased risk of osteoarthritis in a range of ethnic populations whilst previous functional studies revealed that this allele mediates its effect by producing less GDF5 transcript than the C allele. In this study, we sought to identify transcription factors that are binding to rs143383 and that are responsible for mediating this differential level of expression. Using two different approaches we have identified four factors and our functional studies have revealed that three of these factors repress GDF5 expression and that DEAF-1 modulates the differential expression of the two rs143383 alleles. The factors that we have identified could serve as novel therapeutic targets, with their depletion restoring the expression levels of GDF5 in patients with the osteoarthritis susceptibility T allele. The relevance of our results extends beyond osteoarthritis, since the T allele of rs143383 is also a risk factor for a number of other musculoskeletal diseases.
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Affiliation(s)
- Catherine M. Syddall
- Musculoskeletal Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Louise N. Reynard
- Musculoskeletal Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - David A. Young
- Musculoskeletal Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - John Loughlin
- Musculoskeletal Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail:
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47
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van der Deen M, Taipaleenmäki H, Zhang Y, Teplyuk NM, Gupta A, Cinghu S, Shogren K, Maran A, Yaszemski MJ, Ling L, Cool SM, Leong DT, Dierkes C, Zustin J, Salto-Tellez M, Ito Y, Bae SC, Zielenska M, Squire JA, Lian JB, Stein JL, Zambetti GP, Jones SN, Galindo M, Hesse E, Stein GS, van Wijnen AJ. MicroRNA-34c inversely couples the biological functions of the runt-related transcription factor RUNX2 and the tumor suppressor p53 in osteosarcoma. J Biol Chem 2013; 288:21307-21319. [PMID: 23720736 DOI: 10.1074/jbc.m112.445890] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Osteosarcoma (OS) is a primary bone tumor that is most prevalent during adolescence. RUNX2, which stimulates differentiation and suppresses proliferation of osteoblasts, is deregulated in OS. Here, we define pathological roles of RUNX2 in the etiology of OS and mechanisms by which RUNX2 expression is stimulated. RUNX2 is often highly expressed in human OS biopsies and cell lines. Small interference RNA-mediated depletion of RUNX2 inhibits growth of U2OS OS cells. RUNX2 levels are inversely linked to loss of p53 (which predisposes to OS) in distinct OS cell lines and osteoblasts. RUNX2 protein levels decrease upon stabilization of p53 with the MDM2 inhibitor Nutlin-3. Elevated RUNX2 protein expression is post-transcriptionally regulated and directly linked to diminished expression of several validated RUNX2 targeting microRNAs in human OS cells compared with mesenchymal progenitor cells. The p53-dependent miR-34c is the most significantly down-regulated RUNX2 targeting microRNAs in OS. Exogenous supplementation of miR-34c markedly decreases RUNX2 protein levels, whereas 3'-UTR reporter assays establish RUNX2 as a direct target of miR-34c in OS cells. Importantly, Nutlin-3-mediated stabilization of p53 increases expression of miR-34c and decreases RUNX2. Thus, a novel p53-miR-34c-RUNX2 network controls cell growth of osseous cells and is compromised in OS.
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Affiliation(s)
- Margaretha van der Deen
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Hanna Taipaleenmäki
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106,; Heisenberg-Group for Molecular Skeletal Biology, Department of Trauma, Hand, and Reconstructive Surgery, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Ying Zhang
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Nadiya M Teplyuk
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Anurag Gupta
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Senthilkumar Cinghu
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Kristen Shogren
- Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905
| | - Avudaiappan Maran
- Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905
| | - Michael J Yaszemski
- Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905
| | - Ling Ling
- Institute of Medical Biology, Agency for Science, Technology, and Research, 8A Biomedical Grove, #06-06, Immunos, Singapore 138648
| | - Simon M Cool
- Institute of Medical Biology, Agency for Science, Technology, and Research, 8A Biomedical Grove, #06-06, Immunos, Singapore 138648,; Department of Orthopaedic Surgery, National University Hospital of Singapore, 1E Kent Ridge Road, NUHS Tower Block Level 11, Singapore 119228
| | - David T Leong
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
| | - Christian Dierkes
- Medical Care Unit for Histology, Cytology, and Molecular Diagnostics, 54296 Trier, Germany
| | - Jozef Zustin
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Manuel Salto-Tellez
- Centre for Cancer Research and Cell Biology, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, United Kingdom,; Cancer Science Institute of Singapore, National University of Singapore, 14 Medical Drive, 12-01, Centre for Translational Medicine, Singapore 117599
| | - Yoshiaki Ito
- Cancer Science Institute of Singapore, National University of Singapore, 14 Medical Drive, 12-01, Centre for Translational Medicine, Singapore 117599
| | - Suk-Chul Bae
- Department of Biochemistry, School of Medicine, Chungbuk National University, Cheongju 361-763, South Korea
| | - Maria Zielenska
- Department of Paediatric Laboratory Medicine, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada
| | - Jeremy A Squire
- Department of Pathology and Molecular Medicine, Kingston General Hospital, Queen's University, Kingston, Ontario K7L 3N6 Canada
| | - Jane B Lian
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106,; Department of Biochemistry, HSRF 326, Vermont Cancer Center for Basic and Translational Research, University of Vermont Medical School, Burlington, Vermont 05405
| | - Janet L Stein
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106,; Department of Biochemistry, HSRF 326, Vermont Cancer Center for Basic and Translational Research, University of Vermont Medical School, Burlington, Vermont 05405
| | - Gerard P Zambetti
- Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, and
| | - Stephen N Jones
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106
| | - Mario Galindo
- Millennium Institute on Immunology and Immunotherapy and Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Eric Hesse
- Heisenberg-Group for Molecular Skeletal Biology, Department of Trauma, Hand, and Reconstructive Surgery, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Gary S Stein
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106,; Department of Biochemistry, HSRF 326, Vermont Cancer Center for Basic and Translational Research, University of Vermont Medical School, Burlington, Vermont 05405,.
| | - Andre J van Wijnen
- From the Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, Massachusetts 01655-0106,; Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905,; Institute of Medical Biology, Agency for Science, Technology, and Research, 8A Biomedical Grove, #06-06, Immunos, Singapore 138648,; Department of Orthopaedic Surgery, National University Hospital of Singapore, 1E Kent Ridge Road, NUHS Tower Block Level 11, Singapore 119228,.
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48
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Kasaai B, Gaumond MH, Moffatt P. Regulation of the bone-restricted IFITM-like (Bril) gene transcription by Sp and Gli family members and CpG methylation. J Biol Chem 2013; 288:13278-94. [PMID: 23530031 DOI: 10.1074/jbc.m113.457010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND BRIL is a bone-specific membrane protein that is involved in osteogenesis imperfecta type V. RESULTS Bril transcription is activated by Sp1, Sp3, OSX, and GLI2 and by CpG demethylation. CONCLUSION Regulation of Bril involves trans-acting factors integrating at conserved promoter elements and epigenetic modifications. SIGNIFICANCE Identification of the mechanisms governing Bril transcription is important to understand its role in skeletal biology. Bril encodes a small membrane protein present in osteoblasts. In humans, a single recurrent mutation in the 5'-UTR of BRIL causes osteogenesis imperfecta type V. The exact function of BRIL and the mechanism by which it contributes to disease are still unknown. The goal of the current study was to characterize the mechanisms governing Bril transcription in humans, rats, and mice. In the three species, as detected by luciferase reporter assays in UMR106 cells, we found that most of the base-line regulatory activity was localized within ∼250 bp upstream of the coding ATG. Co-transfection experiments indicated that Sp1 and Sp3 were potent inducers of the promoter activity, through the binding of several GC-rich boxes. Osterix was a weak activator but acted cooperatively with Sp1 and GLI2 to synergistically induce the BRIL promoter. GLI2, a mediator of hedgehog signaling pathway, was also a potent activator of BRIL through a single GLI binding site. Correspondingly, agonists of the hedgehog pathway (purmorphamine and Indian hedgehog) in MC3T3 osteoblasts led to increased BRIL levels. The BRIL promoter activity was also found to be negatively modulated through two different mechanisms. First, the ZFP354C zinc finger protein repressed basal and Sp1-induced activity. Second, CpG methylation of the promoter region correlated with an inactive state and prevented Sp1 activation. The data provide the very first analyses of the cis- and trans-acting factors regulating Bril transcription. They revealed key roles for the Sp members and GLI2 that possibly cooperate to activate Bril when the promoter becomes demethylated.
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Affiliation(s)
- Bahar Kasaai
- Shriners Hospital for Children, Montreal, Quebec H3G 1A6, Canada
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49
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Li J, Gu L, Zhang H, Liu T, Tian D, Zhou M, Zhou S. Berberine represses DAXX gene transcription and induces cancer cell apoptosis. J Transl Med 2013; 93:354-64. [PMID: 23295648 PMCID: PMC3961588 DOI: 10.1038/labinvest.2012.172] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Death-domain-associated protein (DAXX) is a multifunctional protein that regulates a wide range of cellular signaling pathways for both cell survival and apoptosis. Regulation of DAXX gene expression remains largely obscure. We recently reported that berberine (BBR), a natural product derived from a plant used in Chinese herbal medicine, downregulates DAXX expression at the transcriptional level. Here, we further investigate the mechanisms underlying the transcriptional suppression of DAXX by BBR. By analyzing and mapping the putative DAXX gene promoter, we identified the core promoter region (from -161 to -1), which contains consensus sequences for the transcriptional factors Sp1 and Ets1. We confirmed that Sp1 and Ets1 bound to the core promoter region of DAXX and stimulated DAXX transcriptional activity. In contrast, BBR bound to the DAXX core promoter region and suppressed its transcriptional activity. Following studies demonstrated a possible mechanism that BBR inhibited the DAXX promoter activity through blocking or disrupting the association of Sp1 or Ets1 and their consensus sequences in the promoter. Downregulation of DAXX by BBR resulted in inhibition of MDM2 and subsequently, activation of p53, leading to cancer cell death. Our results reveal a novel possible mechanism: by competitively binding to the Sp1 and Ets1 consensus sequences, BBR inhibits the transcription of DAXX, thus inducing cancer cell apoptosis through a p53-dependent pathway.
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Affiliation(s)
- Jiansha Li
- Institute of Pathology, Tongji hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lubing Gu
- Departments of Pediatrics, Aflac Center and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Hailong Zhang
- Departments of Pediatrics, Aflac Center and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Tao Liu
- Departments of Pediatrics, Aflac Center and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Dan Tian
- Departments of Pediatrics, Aflac Center and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Muxiang Zhou
- Departments of Pediatrics, Aflac Center and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Sheng Zhou
- Institute of Pathology, Tongji hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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50
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Hovhannisyan H, Zhang Y, Hassan MQ, Wu H, Glackin C, Lian JB, Stein JL, Montecino M, Stein GS, van Wijnen AJ. Genomic occupancy of HLH, AP1 and Runx2 motifs within a nuclease sensitive site of the Runx2 gene. J Cell Physiol 2013; 228:313-21. [PMID: 22886425 DOI: 10.1002/jcp.22109] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Epigenetic mechanisms mediating expression of the Runt-related transcription factor Runx2 are critical for controlling its osteogenic activity during skeletal development. Here, we characterized bona fide regulatory elements within 120 kbp of the endogenous bone-related Runx2 promoter (P1) in osteoblasts by genomic DNase I footprinting and chromatin immuno-precipitations (ChIPs). We identified a ~10 kbp genomic domain spanning the P1 promoter that interacts with acetylated histones H3 and H4 reflecting an open chromatin conformation in MC3T3 osteoblasts. This large chromatin domain contains a single major DNaseI hypersensitive (DHS) region that defines a 0.4 kbp "basal core" promoter. This region encompasses two endogenous genomic protein/DNA interaction sites (i.e., footprints at Activating Protein 1 [AP1], E-box and Runx motifs). Helix-Loop-Helix (HLH)/E-box occupancy and presence of the DHS region persists in several mesenchymal cell types, but AP1 site occupancy occurs only during S phase when Runx2 expression is minimal. Point-mutation of the HLH/E box dramatically reduces basal promoter activity. Our results indicate that the Runx2 P1 promoter utilizes two stable principal protein/DNA interaction domains associated with AP1 and HLH factors. These sites function together with dynamic and developmentally responsive sites in a major DHS region to support epigenetic control of bone-specific transcription when osteoblasts transition into a quiescent or differentiated state.
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Affiliation(s)
- Hayk Hovhannisyan
- Department of Cell Biology, University of Massachusetts Medical School, Worcester, Massachusetts, USA
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