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Zhao X, Lin S, Ren H, Sun S, Zheng L, Chen LF, Wang Z. The histone methyltransferase ASH1L protects against bone loss by inhibiting osteoclastogenesis. Cell Death Differ 2024; 31:605-617. [PMID: 38431690 PMCID: PMC11094046 DOI: 10.1038/s41418-024-01274-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 02/16/2024] [Accepted: 02/20/2024] [Indexed: 03/05/2024] Open
Abstract
Absent, small, or homeotic1-like (ASH1L) is a histone lysine methyltransferase that generally functions as a transcriptional activator in controlling cell fate. So far, its physiological relevance in bone homeostasis and osteoclast differentiation remains elusive. Here, by conditional deleting Ash1l in osteoclast progenitors of mice, we found ASH1L deficiency resulted in osteoporosis and potentiation of osteoclastogenesis in vivo and in vitro. Mechanistically, ASH1L binds the promoter of the Src homology 3 and cysteine-rich domain 2 (Stac2) and increases the gene's transcription via histone 3 lysine 4 (H3K4) trimethylation modification, thus augmenting the STAC2's protection against receptor activator of nuclear factor kB ligand (RANKL)-initiated inflammation during osteoclast formation. Collectively, we demonstrate the first piece of evidence to prove ASH1L as a critical checkpoint during osteoclastogenesis. The work sheds new light on our understanding about the biological function of ASH1L in bone homeostasis, therefore providing a valuable therapeutic target for the treatment of osteoporosis or inflammatory bone diseases.
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Affiliation(s)
- Xiaoli Zhao
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shuai Lin
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - Hangjiang Ren
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shenghui Sun
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Liyun Zheng
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Lin-Feng Chen
- Department of Biochemistry, School of Molecular and Cellular Biology, University of Illinois at Urbana-Champaign, Urbana, USA
| | - Zhen Wang
- Department of Biochemistry, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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Arasaki Y, Hayata T. The RNA-binding protein Cpeb4 regulates splicing of the Id2 gene in osteoclast differentiation. J Cell Physiol 2024; 239:e31197. [PMID: 38284484 DOI: 10.1002/jcp.31197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 01/04/2024] [Accepted: 01/09/2024] [Indexed: 01/30/2024]
Abstract
Cytoplasmic polyadenylation element-binding protein 4 (Cpeb4) is an RNA-binding protein that regulates posttranscriptional regulation, such as regulation of messenger RNA stability and translation. In the previous study, we reported that Cpeb4 localizes to nuclear bodies upon induction of osteoclast differentiation by RANKL. However, the mechanisms of the localization of Cpeb4 and osteoclastogenesis by Cpeb4 remain unknown. Here, we show that Cpeb4 localizes to the nuclear bodies by its RNA-binding ability and partially regulates normal splicing during osteoclast differentiation. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis with Phos-tag® revealed that the phosphorylation levels of Cpeb4 were already high in the RAW264.7 cells and were not altered by RANKL treatment. Immunofluorescence showed that exogenous Cpeb4 in HEK293T cells without RANKL stimulation localized to the same foci as shown in RANKL-stimulated RAW264.7 cells. Furthermore, when nuclear export was inhibited by leptomycin B treatment, Cpeb4 accumulated throughout the nucleus. Importantly, RNA recognition motif (RRM) 7 of Cpeb4 was essential for the localization. In contrast, the intrinsically disordered region, RRM1, and zinc finger domain CEBP_ZZ were not necessary for the localization. The mechanistic study showed that Cpeb4 co-localized and interacted with the splicing factors serine/arginine-rich splicing factor 5 (SRSF5) and SRSF6, suggesting that Cpeb4 may be involved in the splicing reaction. RNA-sequencing analysis revealed that the expression of genes related to cell proliferation processes, such as mitotic cell cycle and regulation of cell cycle processes, was elevated in osteoclasts depleted of Cpeb4. Interestingly, the splicing pattern of the inhibitor of DNA binding 2 (Id2) gene, which suppresses osteoclast differentiation, was altered by the depletion of Cpeb4. These results provide new insight into the role of Cpeb4 as a player of normal splicing of Id2 in osteoclast differentiation.
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Affiliation(s)
- Yasuhiro Arasaki
- Department of Molecular Pharmacology, Faculty of Pharmaceutical Science, Graduate School of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
| | - Tadayoshi Hayata
- Department of Molecular Pharmacology, Faculty of Pharmaceutical Science, Graduate School of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
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3
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Wang H, Joshi P, Hong SH, Maye PF, Rowe DW, Shin DG. Predicting the targets of IRF8 and NFATc1 during osteoclast differentiation using the machine learning method framework cTAP. BMC Genomics 2022; 23:14. [PMID: 34991467 PMCID: PMC8740472 DOI: 10.1186/s12864-021-08159-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 10/26/2021] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Interferon regulatory factor-8 (IRF8) and nuclear factor-activated T cells c1 (NFATc1) are two transcription factors that have an important role in osteoclast differentiation. Thanks to ChIP-seq technology, scientists can now estimate potential genome-wide target genes of IRF8 and NFATc1. However, finding target genes that are consistently up-regulated or down-regulated across different studies is hard because it requires analysis of a large number of high-throughput expression studies from a comparable context. METHOD We have developed a machine learning based method, called, Cohort-based TF target prediction system (cTAP) to overcome this problem. This method assumes that the pathway involving the transcription factors of interest is featured with multiple "functional groups" of marker genes pertaining to the concerned biological process. It uses two notions, Gene-Present Sufficiently (GP) and Gene-Absent Insufficiently (GA), in addition to log2 fold changes of differentially expressed genes for the prediction. Target prediction is made by applying multiple machine-learning models, which learn the patterns of GP and GA from log2 fold changes and four types of Z scores from the normalized cohort's gene expression data. The learned patterns are then associated with the putative transcription factor targets to identify genes that consistently exhibit Up/Down gene regulation patterns within the cohort. We applied this method to 11 publicly available GEO data sets related to osteoclastgenesis. RESULT Our experiment identified a small number of Up/Down IRF8 and NFATc1 target genes as relevant to osteoclast differentiation. The machine learning models using GP and GA produced NFATc1 and IRF8 target genes different than simply using a log2 fold change alone. Our literature survey revealed that all predicted target genes have known roles in bone remodeling, specifically related to the immune system and osteoclast formation and functions, suggesting confidence and validity in our method. CONCLUSION cTAP was motivated by recognizing that biologists tend to use Z score values present in data sets for the analysis. However, using cTAP effectively presupposes assembling a sizable cohort of gene expression data sets within a comparable context. As public gene expression data repositories grow, the need to use cohort-based analysis method like cTAP will become increasingly important.
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Affiliation(s)
- Honglin Wang
- Computer Science and Engineering Department, University of Connecticut, Storrs, USA
| | - Pujan Joshi
- Computer Science and Engineering Department, University of Connecticut, Storrs, USA
| | - Seung-Hyun Hong
- Computer Science and Engineering Department, University of Connecticut, Storrs, USA
| | - Peter F. Maye
- Department of Reconstructive Sciences, University of Connecticut Health Center, Farmington, USA
| | - David W. Rowe
- Center for Regenerative Medicine and Skeletal Development, University of Connecticut Health Center, Farmington, USA
| | - Dong-Guk Shin
- Computer Science and Engineering Department, University of Connecticut, Storrs, USA
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4
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Molecular insights for an anti-osteoporotic properties of Litsea glutinosa on Saos-2 cells: An in-vitro approach. J Ayurveda Integr Med 2021; 13:100501. [PMID: 34799209 PMCID: PMC8728066 DOI: 10.1016/j.jaim.2021.07.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 07/22/2021] [Accepted: 07/23/2021] [Indexed: 01/26/2023] Open
Abstract
Osteoporosis is a skeletal disease that is identified by the deterioration of micro-architecture of bone tissue, leading to enhanced bone brittleness and a consequential increase in fracture threat. There are many treatments available for osteoporosis such as bisphosphonate therapy, hormonal replacement therapy, herbal therapy etc. For decades, there are several herbs that are attributed to have anti-osteoporotic effects however the candidate genes involved in it remained unknown. In line with this, the present study is focused to elucidate the anti-osteoporotic property of Litsea glutinosa (LG). To understand the proliferative effect and identify involved players, gene expression was studied on the Saos-2 osteocytes in-vitro. The expression profile of candidate genes involved in different signaling pathways such as Egr-2, RUNX2, MAPK3, NFATc1, CREB, ERβ, along with proliferation and apoptotic markers in osteoporosis were selected for the study. The gene expression profile demonstrated a significant up-regulation of Egr-2, RUNX2, MAPK3, CREB, EBβ in the range of 1.5–2.2 folds, whereas NFATc1 was found to be down-regulated up to 0.4 times compared to control when treated with 250 μg/mL of LG. Besides this, anti-apoptosis effect of LG was also supported by flow cytometry results which also proved that LG induces proliferation and inhibits apoptosis, suggesting the proliferative role of LG. In conclusion, the present study gathers the potency of LG extract for its proliferative and anti-apoptotic effect on Saos-2 osteocytes and opens a new avenue for detailing the mechanistic actions of it on mitigating the pathophysiology of osteoporosis.
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Xu J, Li D, Cai Z, Sun H, Su B, Qiu M, Ma R. Exosomal lncRNAs NONMMUT000375.2 and NONMMUT071578.2 derived from titanium particle treated RAW264.7 cells regulate osteogenic differentiation of MC3T3-E1 cells. J Biomed Mater Res A 2020; 108:2251-2262. [PMID: 32363719 DOI: 10.1002/jbm.a.36983] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 03/25/2020] [Accepted: 04/19/2020] [Indexed: 12/19/2022]
Abstract
Periprosthetic osteolysis and the subsequent aseptic loosening can lead to the failure of joint replacement. Wear particles are well known to be the initiative cause inducing osteolysis through enhancing osteoclast-mediated bone resorption and reducing osteogenic differentiation. The purpose of this study was to investigate the effects of osteoclast-secreted exosomal long noncoding RNAs (lncRNAs) on osteogenesis in the process of particle-induced osteolysis. RAW264.7 cells were treated by titanium particles (TI). The inflammatory cytokines were increased, and expression of Receptor Activator of Nuclear Factor-κB and Nuclear factor of activated T cells c1 were also increased, indicating osteoclast differentiation occurred. The purified exosomes from RAW264.7 cells induced with TI inhibited osteogenic differentiation of MC3T3-E1 cells. RNA sequencing generated lncRNAs expression profiles (458 up-regulated and 1641 down-regulated) of the exosomes derived from RAW264.7 cells treated with TI. Based on the results of gene ontology/Kyoto Encyclopedia of Genes and Genomes analysis and quantitative real time polymerase chain reaction validation, we confirmed two candidate lncRNAs, NONMMUT000375.2 and NONMMUT071578.2. The regulation network presented that some vital genes involved in osteoclast differentiation, such as Bcl2, Wnt11, TGF-β, and Pdk1, were under the regulation of NONMMUT000375.2 and NONMMUT071578.2. Taken together, exosomes derived from TI treated RAW264.7 cells inhibit the osteogenic activity of MC3T3-E1 cells. Exosomal lncRNAs, NONMMUT000375.2 and NONMMUT071578.2 may potentially play their roles in promoting osteoclast differentiation and suppressing osteogenesis, which aggravates the osteoclastogenesis/osteogenesis imbalance.
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Affiliation(s)
- Jie Xu
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Deng Li
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhiqing Cai
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Hao Sun
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Baohua Su
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Meiling Qiu
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Ruofan Ma
- Department of Joint Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
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6
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Shi M, Tan S, Xie XP, Li A, Yang W, Zhu T, Wang HQ. Globally learning gene regulatory networks based on hidden atomic regulators from transcriptomic big data. BMC Genomics 2020; 21:711. [PMID: 33054712 PMCID: PMC7559338 DOI: 10.1186/s12864-020-07079-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 09/18/2020] [Indexed: 12/02/2022] Open
Abstract
Background Genes are regulated by various types of regulators and most of them are still unknown or unobserved. Current gene regulatory networks (GRNs) reverse engineering methods often neglect the unknown regulators and infer regulatory relationships in a local and sub-optimal manner. Results This paper proposes a global GRNs inference framework based on dictionary learning, named dlGRN. The method intends to learn atomic regulators (ARs) from gene expression data using a modified dictionary learning (DL) algorithm, which reflects the whole gene regulatory system, and predicts the regulation between a known regulator and a target gene in a global regression way. The modified DL algorithm fits the scale-free property of biological network, rendering dlGRN intrinsically discern direct and indirect regulations. Conclusions Extensive experimental results on simulation and real-world data demonstrate the effectiveness and efficiency of dlGRN in reverse engineering GRNs. A novel predicted transcription regulation between a TF TFAP2C and an oncogene EGFR was experimentally verified in lung cancer cells. Furthermore, the real application reveals the prevalence of DNA methylation regulation in gene regulatory system. dlGRN can be a standalone tool for GRN inference for its globalization and robustness.
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Affiliation(s)
- Ming Shi
- MICB Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, CAS, 350 Shushanghu Road, Hefei, Anhui, 230031, P. R. China.,Current Address: MOE Key Laboratory of Bioinformatics, Division of Bioinformatics and Center for Synthetic and Systems Biology, TNLIST, Department of Automation, Tsinghua University, Beijing, 100084, China
| | - Sheng Tan
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Division of Life Sciences and Medicine, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, P. R. China
| | - Xin-Ping Xie
- School of Mathematics and Physics, Anhui Jianzhu University, 856 Jinzhai Road, Hefei, Anhui, 230022, P. R. China
| | - Ao Li
- School of Information Science and Technology, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, P. R. China
| | - Wulin Yang
- Cancer hospital & Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, CAS, 350 Shushanghu Road, Hefei, Anhui, 230031, P. R. China
| | - Tao Zhu
- Current Address: MOE Key Laboratory of Bioinformatics, Division of Bioinformatics and Center for Synthetic and Systems Biology, TNLIST, Department of Automation, Tsinghua University, Beijing, 100084, China.
| | - Hong-Qiang Wang
- MICB Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, CAS, 350 Shushanghu Road, Hefei, Anhui, 230031, P. R. China. .,Cancer hospital & Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, CAS, 350 Shushanghu Road, Hefei, Anhui, 230031, P. R. China.
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7
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Sabag E, Halperin E, Liron T, Hiram-Bab S, Frenkel B, Gabet Y. Hormone-Independent Sexual Dimorphism in the Regulation of Bone Resorption by Krox20. J Bone Miner Res 2019; 34:2277-2286. [PMID: 31398266 DOI: 10.1002/jbmr.3847] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 06/28/2019] [Accepted: 07/28/2019] [Indexed: 12/22/2022]
Abstract
Krox20/EGR2 is a zinc finger transcription factor, implicated in the development of the hindbrain, nerve myelination, and tumor suppression. In skeletal biology, we have demonstrated that Krox20 also regulates adult bone metabolism. We and others have characterized several functions of Krox20 in the osteoclast lineage, namely, preosteoclast proliferation and differentiation, and mature osteoclast apoptosis. We have previously reported that systemically Krox20-haploinsufficient mice have a low bone mass with increased bone resorption. However, new data have now revealed that this phenotype is restricted to females. In addition, we discovered that conditional knockout of Krox20 (cKO) restricted to osteoclast progenitors is sufficient to induce the same female-specific bone loss observed in systemic mutants. To test whether this sexual dimorphism results from an interaction between Krox20 and sex hormones, we examined the sex- and hormone-dependent role of Krox20 deficiency on proliferation and apoptosis in osteoclastic cells. Our results indicate that male and female sex hormones (dihydrotestosterone [DHT] and estradiol [E2], respectively) as well as Krox20 inhibit preosteoclast proliferation and augment osteoclast apoptosis. The observation that Krox20 expression is inhibited by DHT and E2 negates the hypothesis that the effect of sex hormones is mediated by an increase in Krox20 expression. Interestingly, the effect of Krox20 deficiency was observed only with cells derived from female animals, regardless of any sex hormones added in vitro. In addition, we have identified sexual dimorphism in the expression of several Krox20-related genes, including NAB2. This sex-specific epigenetic profile was established at puberty, maintained in the absence of sex hormones, and explains the female-specific skeletal importance of Krox20. The findings described in this study emphasize the medical importance of sex differences, which may be determined at the epigenetic level. © 2019 American Society for Bone and Mineral Research.
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Affiliation(s)
- Elias Sabag
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Elinor Halperin
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tamar Liron
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sahar Hiram-Bab
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Baruch Frenkel
- Department of Biochemistry and Molecular Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA.,Department of Orthopedic Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA
| | - Yankel Gabet
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel-Aviv University, Tel-Aviv, Israel
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8
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Mu X, Liu J, Yuan L, Yang K, Huang Y, Wang C, Yang W, Shen G, Li Y. The mechanisms underlying the developmental effects of bisphenol F on zebrafish. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 687:877-884. [PMID: 31412491 DOI: 10.1016/j.scitotenv.2019.05.489] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/22/2019] [Accepted: 05/31/2019] [Indexed: 06/10/2023]
Abstract
With the increasing use of bisphenol F (BPF) as BPA alternative, BPF are widely distributed in multiple environment media. Our previous study demonstrated that BPF possess equivalent toxicity towards zebrafish as BPA, while its toxic mechanism remains largely unknown. To investigate the mechanisms mediating the developmental effects of BPF, zebrafish embryos were exposed to 0.0005, 0.5, and 5.0 mg/L BPF. Morphological examination indicated that BPF exposure led to depigmentation, decreased heart rate, inhibited spontaneous movement, hatch inhibition, and spinal deformation. Motor neuron-green fluorescence zebrafish assay indicated that exposure to 0.5 or 5.0 mg/L BPF affected embryonic motor neuron development, which is consistent with the spinal defect and spontaneous movement inhibition. Transcriptomic analysis showed that genes associated with the observed symptoms, including neuron development (ngln2a, socs3a, fosb), cardiac development (klf2a), and spinal deformation (ngs, col8a1a, egr2a), were down-regulated after exposure to either 0.0005 (environmental relevant concentration) or 0.5 mg/L BPF. This partially explained the mechanisms underlying the effects of BPF. In conclusion, BPF had the potential to affect zebrafish development even at environmental level through down-regulating associated genes.
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Affiliation(s)
- Xiyan Mu
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China.
| | - Jia Liu
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Lilai Yuan
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Ke Yang
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Ying Huang
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Chengju Wang
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Wenbo Yang
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Gongming Shen
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Yingren Li
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China.
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9
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Kim H, Kim BK, Ohk B, Yoon H, Kang WY, Cho S, Seong SJ, Lee HW, Yoon Y. Estrogen‐related receptor γ negatively regulates osteoclastogenesis and protects against inflammatory bone loss. J Cell Physiol 2018; 234:1659-1670. [DOI: 10.1002/jcp.27035] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 06/25/2018] [Indexed: 01/01/2023]
Affiliation(s)
- Hyun‐Ju Kim
- Department of Molecular Medicine Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University Daegu Republic of Korea
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Bo Kyung Kim
- Department of Molecular Medicine Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University Daegu Republic of Korea
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Boram Ohk
- Department of Molecular Medicine Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University Daegu Republic of Korea
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Hye‐Jin Yoon
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Woo Youl Kang
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Seungil Cho
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Sook Jin Seong
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Hae Won Lee
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
| | - Young‐Ran Yoon
- Department of Molecular Medicine Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University Daegu Republic of Korea
- Clinical Trial Center, Kyungpook National University Hospital Daegu Republic of Korea
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10
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Ahi EP, Sefc KM. Towards a gene regulatory network shaping the fins of the Princess cichlid. Sci Rep 2018; 8:9602. [PMID: 29942008 PMCID: PMC6018552 DOI: 10.1038/s41598-018-27977-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 06/01/2018] [Indexed: 02/08/2023] Open
Abstract
Variation in fin shape and size contributes to the outstanding morphological diversity of teleost fishes, but the regulation of fin growth has not yet been studied extensively outside the zebrafish model. A previous gene expression study addressing the ornamental elongations of unpaired fins in the African cichlid fish Neolamprologus brichardi identified three genes (cx43, mmp9 and sema3d) with strong and consistent expression differences between short and elongated fin regions. Remarkably, the expression patterns of these genes were not consistent with inferences on their regulatory interactions in zebrafish. Here, we identify a gene expression network (GRN) comprising cx43, mmp9, and possibly also sema3d by a stepwise approach of identifying co-expression modules and predicting their upstream regulators. Among the transcription factors (TFs) predicted as potential upstream regulators of 11 co-expressed genes, six TFs (foxc1, foxp1, foxd3, myc, egr2, irf8) showed expression patterns consistent with their cooperative transcriptional regulation of the gene network. Some of these TFs have already been implicated in teleost fish fin regeneration and formation. We particularly discuss the potential function of foxd3 as driver of the network and its role in the unexpected gene expression correlations observed in N. brichardi.
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Affiliation(s)
- Ehsan Pashay Ahi
- Institute of Biology, University of Graz, Universitätsplatz 2, A-8010, Graz, Austria.
| | - Kristina M Sefc
- Institute of Biology, University of Graz, Universitätsplatz 2, A-8010, Graz, Austria
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11
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Yue L, Yu HF, Yang ZQ, Tian XC, Zheng LW, Guo B. Egr2 mediates the differentiation of mouse uterine stromal cells responsiveness to HB-EGF during decidualization. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2018; 330:215-224. [PMID: 29781132 DOI: 10.1002/jez.b.22807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 04/01/2018] [Accepted: 05/03/2018] [Indexed: 12/13/2022]
Abstract
Although Egr2 is involved in regulating the folliculogenesis and ovulation, there is almost no data describing its physiological function in embryo implantation and decidualization. Here, we showed that Egr2 mRNA was distinctly accumulated in subluminal stromal cells around implanting blastocyst on day 5 of pregnancy as well as in estrogen-activated implantation uterus. Estrogen induced the expression of Egr2 in uterine epithelia. Elevated expression of Egr2 mRNA was also observed in the decidual cells. Silencing of Egr2 by specific siRNA weakened the proliferation of uterine stromal cells and reduced the expression of Ccnd1, Ccnd3, Cdk4, and Cdk6. Furthermore, Egr2 advanced the expression of Prl8a2, Prl3c1, and Pgr, the well-established differentiation markers for decidualization. Administration of exogenous recombinant heparin-binding EGF-like growth factor (rHB-EGF) to uterine stromal cells resulted in an increase in the level of Egr2 mRNA. Moreover, siRNA-mediated attenuation of Egr2 impeded the stimulation of HB-EGF on stromal cell differentiation. Knockdown of Egr2 led to a reduction in the expression of Cox-2, mPGES-1, Vegf, Trp53, and Mmp2. Further analysis found that Egr2 may serve as an intermediate to mediate the regulation of HB-EGF on Cox-2, mPGES-1, Vegf, Trp53, Mmp2, and Ccnd3. Collectively, Egr2 may play an important role during embryo implantation and decidualization.
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Affiliation(s)
- Liang Yue
- College of Veterinary Medicine, Jilin University, Changchun, P. R. China.,College of Clinical Medicine, Jilin University, Changchun, P. R. China
| | - Hai-Fan Yu
- College of Veterinary Medicine, Jilin University, Changchun, P. R. China
| | - Zhan-Qing Yang
- College of Veterinary Medicine, Jilin University, Changchun, P. R. China
| | - Xue-Chao Tian
- College of Veterinary Medicine, Jilin University, Changchun, P. R. China
| | - Lian-Wen Zheng
- Reproductive Medical Center, the Second Hospital of Jilin University, Changchun, P. R. China
| | - Bin Guo
- College of Veterinary Medicine, Jilin University, Changchun, P. R. China
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12
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Wang L, Sun H, Wang X, Hou N, Zhao L, Tong D, He K, Yang Y, Song T, Yang J, Huang C. EGR1 mediates miR-203a suppress the hepatocellular carcinoma cells progression by targeting HOXD3 through EGFR signaling pathway. Oncotarget 2018; 7:45302-45316. [PMID: 27244890 PMCID: PMC5216724 DOI: 10.18632/oncotarget.9605] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 04/26/2016] [Indexed: 12/21/2022] Open
Abstract
EGR1 plays a critical role in cancer progression. However, its precise role in hepatocellular carcinoma has not been elucidated. In this study, we found that the overexpression of EGR1 suppresses hepatocellular carcinoma cell proliferation and increases cell apoptosis by binding to the miR-203a promoter sequence. In addition, we investigated the function of miR-203a on progression of HCC cells. We verified that the effect of overexpression of miR-203a is consistent with that of EGR1 in regulation of cell progression. Through bioinformatic analysis and luciferase assays, we confirmed that miR-203a targets HOXD3. Silencing HOXD3 could block transition of the G2/M phase, increase cell apoptosis, decrease the expression of cell cycle and apoptosis-related proteins, EGFR, p-AKT, p-ERK, CCNB1, CDK1 and Bcl2 by targeting EGFR through EGFR/AKT and ERK cell signaling pathways. Likewise, restoration of HOXD3 counteracted the effects of miR-203a expression.In conclusion, our findings are the first to demonstrate that EGR1 is a key player in the transcriptional control of miR-203a, and that miR-203a acts as an anti-oncogene to suppress HCC tumorigenesis by targeting HOXD3 through EGFR-related cell signaling pathways.
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Affiliation(s)
- Lumin Wang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Hongfei Sun
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Xiaofei Wang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Ni Hou
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Lingyu Zhao
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Dongdong Tong
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Kang He
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Yang Yang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Tusheng Song
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
| | - Jun Yang
- Department of Pathology, Second Affiliated Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi, P.R. China
| | - Chen Huang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China.,Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China.,Cardiovascular Research Center, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, P.R. China
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13
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Zhang Q, Song G, Yao L, Liu Y, Liu M, Li S, Tang H. miR-3928v is induced by HBx via NF-κB/EGR1 and contributes to hepatocellular carcinoma malignancy by down-regulating VDAC3. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2018; 37:14. [PMID: 29378599 PMCID: PMC5789631 DOI: 10.1186/s13046-018-0681-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/15/2018] [Indexed: 12/29/2022]
Abstract
BACKGROUND Hepatitis B virus (HBV) plays a critical role in the tumorigenic behavior of human hepatocellular carcinoma (HCC). MicroRNAs (miRNAs) have been reported to participate in HCC development via the regulation of their target genes. However, HBV-modulated miRNAs involved in tumorigenesis remain to be identified. Here, we found that a novel highly expressed miRNA, TLRC-m0008_3p (miR-3928v), may be an important factor that promotes the malignancy of HBV-related HCC. METHODS Solexa sequencing was applied to profile miRNAs, and RT-qPCR was used to identify and quantitate miRNAs. We studied miR-3928v function in HCC cell lines by MTT, colony formation, migration/invasion, and vascular mimicry (VM) assays in vitro and by a xenograft tumor model in vivo. Finally, we predicted and verified the target gene of miR-3928v by a reporter assay, studied the function of this target gene, and cloned the promoter of miR-3928v and the transcription factor for use in dual-luciferase reporter assays and EMSAs. RESULTS A variant of miR-3928 (miR-3928v) was identified and found to be highly expressed in HBV (+) HCC tissues. Voltage-dependent anion channel 3 (VDAC3) was validated as a target of miR-3928v and found to mediate the effects of miR-3928v in promoting HCC growth and migration/invasion. Furthermore, HBx protein increased early growth response 1 (EGR1) expression and facilitated its translocation into the nucleus to enhance miR-3928v promoter activity in an NF-κB signaling-dependent manner. CONCLUSIONS miR-3928v is induced by HBx through the NF-κB/EGR1 signaling pathway and down-regulates the tumor suppressor gene VDAC3 to accelerate the progression of HCC.
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Affiliation(s)
- Qiaoge Zhang
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Ge Song
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Lili Yao
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Yankun Liu
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China ,grid.459483.7The Cancer Institute, Tangshan People’s Hospital, Tangshan, 063001 China
| | - Min Liu
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Shengping Li
- 0000 0001 2360 039Xgrid.12981.33Department of Hepatobiliary Oncology, State Key Laboratory of Oncology in Southern China, Cancer Center, Sun Yat-sen University, Guangzhou, 510060 China
| | - Hua Tang
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
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14
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Shukla P, Mansoori MN, Kakaji M, Shukla M, Gupta SK, Singh D. Interleukin 27 (IL-27) Alleviates Bone Loss in Estrogen-deficient Conditions by Induction of Early Growth Response-2 Gene. J Biol Chem 2017; 292:4686-4699. [PMID: 28130449 DOI: 10.1074/jbc.m116.764779] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/27/2017] [Indexed: 12/13/2022] Open
Abstract
A growing understanding of the bone remodeling process suggests that inflammation significantly contributes to the pathogenesis of osteoporosis. T cells and various cytokines contribute majorly to the estrogen deficiency-induced bone loss. Recent studies have identified the IL-12 cytokine family as consisting of pro-inflammatory IL-12 and IL-23 and the anti-inflammatory IL-27 and IL-35 cytokines. IL-27 exerts protective effects in autoimmune diseases like experimental autoimmune encephalomyelitis; however, its role in the pathogenesis of osteoporosis remains to be determined. In this report, we study the effect of IL-27 supplementation on ovariectomized estrogen-deficient mice on various immune and skeletal parameters. IL-27 treatment in ovariectomized mice suppressed Th17 cell differentiation by inhibiting transcription factor RORγt. Supplementation of IL-27 activates Egr-2 to induce IL-10 producing Tr1 cells. IL-27 treatment prevented the loss of trabecular micro-architecture and preserved cortical bone parameters. IL-27 also inhibited osteoblast apoptosis through increased Egr-2 expression, which induces anti-apoptotic factors like MCL-1. IL-27 suppressed osteoclastogenesis in an Egr-2-dependent manner that up-regulates Id2, the repressor of the receptor activator of nuclear factor-κB ligand-mediated osteoclastogenesis. Additionally, these results were corroborated in female osteoporotic subjects where we found decreased serum IL-27 levels along with reduced Egr-2 expression. Our study forms a strong basis for using humanized IL-27 toward the treatment of post-menopausal osteoporosis.
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Affiliation(s)
- Priyanka Shukla
- From the Division of Endocrinology and Centre for Research in Anabolic Skeletal Targets in Health and Illness (ASTHI), Council of Scientific and Industrial Research-Central Drug Research Institute, B.S. 10/1, Sector-10, Jankipuram Extension, Lucknow CDRI-226031 and
| | - Mohd Nizam Mansoori
- From the Division of Endocrinology and Centre for Research in Anabolic Skeletal Targets in Health and Illness (ASTHI), Council of Scientific and Industrial Research-Central Drug Research Institute, B.S. 10/1, Sector-10, Jankipuram Extension, Lucknow CDRI-226031 and
| | - Manisha Kakaji
- the Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow PGI-226014, India
| | - Manoj Shukla
- the Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow PGI-226014, India
| | - Sushil Kumar Gupta
- the Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow PGI-226014, India
| | - Divya Singh
- From the Division of Endocrinology and Centre for Research in Anabolic Skeletal Targets in Health and Illness (ASTHI), Council of Scientific and Industrial Research-Central Drug Research Institute, B.S. 10/1, Sector-10, Jankipuram Extension, Lucknow CDRI-226031 and
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15
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Abstract
Inhibitors of DNA binding and cell differentiation (Id) proteins are members of the large family of the helix-loop-helix (HLH) transcription factors, but they lack any DNA-binding motif. During development, the Id proteins play a key role in the regulation of cell-cycle progression and cell differentiation by modulating different cell-cycle regulators both by direct and indirect mechanisms. Several Id-protein interacting partners have been identified thus far, which belong to structurally and functionally unrelated families, including, among others, the class I and II bHLH transcription factors, the retinoblastoma protein and related pocket proteins, the paired-box transcription factors, and the S5a subunit of the 26 S proteasome. Although the HLH domain of the Id proteins is involved in most of their protein-protein interaction events, additional motifs located in their N-terminal and C-terminal regions are required for the recognition of diverse protein partners. The ability of the Id proteins to interact with structurally different proteins is likely to arise from their conformational flexibility: indeed, these proteins contain intrinsically disordered regions that, in the case of the HLH region, undergo folding upon self- or heteroassociation. Besides their crucial role for cell-fate determination and cell-cycle progression during development, other important cellular events have been related to the Id-protein expression in a number of pathologies. Dysregulated Id-protein expression has been associated with tumor growth, vascularization, invasiveness, metastasis, chemoresistance and stemness, as well as with various developmental defects and diseases. Herein we provide an overview on the structural properties, mode of action, biological function and therapeutic potential of these regulatory proteins.
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Affiliation(s)
- Cornelia Roschger
- Department of Molecular Biology, University of Salzburg, Billrothstrasse 11, Salzburg, 5020, Austria
| | - Chiara Cabrele
- Department of Molecular Biology, University of Salzburg, Billrothstrasse 11, Salzburg, 5020, Austria.
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16
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Roschger C, Cabrele C. The Id-protein family in developmental and cancer-associated pathways. Cell Commun Signal 2017; 15:7. [PMID: 28122577 PMCID: PMC5267474 DOI: 10.1186/s12964-016-0161-y] [Citation(s) in RCA: 122] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 12/29/2016] [Indexed: 01/15/2023] Open
Abstract
Inhibitors of DNA binding and cell differentiation (Id) proteins are members of the large family of the helix-loop-helix (HLH) transcription factors, but they lack any DNA-binding motif. During development, the Id proteins play a key role in the regulation of cell-cycle progression and cell differentiation by modulating different cell-cycle regulators both by direct and indirect mechanisms. Several Id-protein interacting partners have been identified thus far, which belong to structurally and functionally unrelated families, including, among others, the class I and II bHLH transcription factors, the retinoblastoma protein and related pocket proteins, the paired-box transcription factors, and the S5a subunit of the 26 S proteasome. Although the HLH domain of the Id proteins is involved in most of their protein-protein interaction events, additional motifs located in their N-terminal and C-terminal regions are required for the recognition of diverse protein partners. The ability of the Id proteins to interact with structurally different proteins is likely to arise from their conformational flexibility: indeed, these proteins contain intrinsically disordered regions that, in the case of the HLH region, undergo folding upon self- or heteroassociation. Besides their crucial role for cell-fate determination and cell-cycle progression during development, other important cellular events have been related to the Id-protein expression in a number of pathologies. Dysregulated Id-protein expression has been associated with tumor growth, vascularization, invasiveness, metastasis, chemoresistance and stemness, as well as with various developmental defects and diseases. Herein we provide an overview on the structural properties, mode of action, biological function and therapeutic potential of these regulatory proteins.
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Affiliation(s)
- Cornelia Roschger
- Department of Molecular Biology, University of Salzburg, Billrothstrasse 11, Salzburg, 5020, Austria
| | - Chiara Cabrele
- Department of Molecular Biology, University of Salzburg, Billrothstrasse 11, Salzburg, 5020, Austria.
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17
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Early growth response 3 inhibits growth of hepatocellular carcinoma cells via upregulation of Fas ligand. Int J Oncol 2017; 50:805-814. [PMID: 28098878 DOI: 10.3892/ijo.2017.3855] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Accepted: 11/07/2016] [Indexed: 11/05/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is a prevalent malignancy with aggressive biological behavior and poor prognosis. Early growth response 3 (EGR3) is a zinc finger transcription factor, and has been studied primarily in the context of neurodevelopment, autoimmunity, inflammation and angiogenesis. Accumulating evidence indicates that EGR3 is a novel suppressor gene of tumor initiation and progression in certain cancer events, but little work has been carried out in exploring the relationship between EGR3 and HCC growth. The purpose of this study was to investigate the possible effects of EGR3 on cell proliferation and apoptosis in HCC, and determine the underlying mechanisms. Here, we observed that EGR3 expression was frequently downregulated in HCC tissues and cell lines. Ectopic expression of EGR3 contributed to cell proliferation inhibition and apoptosis induction in HCC cells in vitro. Furthermore, the expression of Fas ligand (FasL) was significantly enhanced following upregulation of EGR3 in HCC cells, accompanied by an obvious increase of pro-apoptotic Bak and cell cycle inhibitor p21 expression. Based on nude mouse models, we demonstrated that ectopic expression of EGR3 markedly restricted tumor growth, and the expression of FasL was significantly increased in the xenograft tumor tissues which exhibited high EGR3 expression. We further established a co-transfection in HCC cells with EGR3 overexpression plasmid and FasL siRNA. We found that silencing of FasL gene impeded the anti-proliferative and pro-apoptotic effects, as well as the increase of Bak and p21 expression, suggesting an essential role of FasL in EGR3-mediated growth suppression in HCC cells. Collectively, in conclusion, EGR3 contributes to cell growth inhibition via upregulation of FasL in HCC.
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18
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Shim KS, Lee CJ, Yim NH, Ha H, Ma JY. A water extract of Malva verticillata seeds suppresses osteoclastogenesis and bone resorption stimulated by RANK ligand. Altern Ther Health Med 2016; 16:332. [PMID: 27580958 PMCID: PMC5007869 DOI: 10.1186/s12906-016-1295-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 08/17/2016] [Indexed: 02/08/2023]
Abstract
Background Malva verticillata seeds are used as a therapeutic medicine to treat kidney dysfunction in traditional Chinese medicine (TCM). TCM has suggested that herbal medicine tonifying kidney function may have beneficial effect on bone metabolism. Methods Osteoclastogenesis was examined in bone marrow macrophages by measuring tartrate-resistant acid phosphatase (TRAP) activity and counting the number of TRAP-stained multinuclear cells. The activation of receptor activator of nuclear factor-kB (RANK) ligand signaling, and the expression of c-Fos and nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1) were investigated by western blot analysis. Transcription factor and bone resorption marker mRNA levels were evaluated using real-time quantitative polymerase chain reaction. The bone resorption activity of mature osteoclast was examined in osteoclasts cultured on a hydroxyapatite-coated culture plate. Results A water extract of M. verticillata seeds (WEMV) inhibited osteoclastogenesis stimulated by RANKL. WEMV also strongly inhibited expression of c-Fos and NFATc1 as well as phosphorylation of c-Jun N-terminal kinase, p38, I-kBα, and phospholipase γ2. Furthermore, WEMV significantly attenuated osteoclast resorption activity and downregulated mRNA expression of resorption markers. Conclusion These results demonstrate that WEMV inhibits osteoclastogenesis and bone resorption by suppressing the RANKL signaling pathway and suggest that M. verticillata seeds may be used as a therapeutic candidate in complementary alternative medicine to treat pathological bone diseases.
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19
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Kim HJ, Kang WY, Seong SJ, Kim SY, Lim MS, Yoon YR. Follistatin-like 1 promotes osteoclast formation via RANKL-mediated NF-κB activation and M-CSF-induced precursor proliferation. Cell Signal 2016; 28:1137-1144. [PMID: 27234130 DOI: 10.1016/j.cellsig.2016.05.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/19/2016] [Accepted: 05/22/2016] [Indexed: 12/25/2022]
Abstract
Follistatin-like 1 (FSTL1) functions as a pivotal modulator of inflammation and is implicated in many inflammatory diseases such as rheumatoid arthritis. Here, we report that FSTL1 is strongly upregulated and secreted during osteoclast differentiation of bone marrow-derived macrophages (BMMs) and that FSTL1 positively regulates osteoclast formation induced by RANKL and M-CSF. The overexpression of FSTL1 or treatment with recombinant FSTL1 (rFSTL1) in BMMs enhances the formation of multinuclear osteoclasts and the induction of c-Fos and NFATc1, transcription factors important for osteoclastogenesis. Conversely, knockdown of FSTL1 using a small hairpin RNA suppresses osteoclast formation and the expression of these transcription factors. While FSTL1 does not affect RANKL-stimulated activation of p38 MAPK, phosphorylation of IκBα, JNK, and ERK were increased by overexpression or addition of rFSTL1. Furthermore, rFSTL1 increased RANKL-induced NF-κB transcriptional activity in a dose-dependent manner. In addition to its role in osteoclastogenesis, FSTL1 promotes proliferation of osteoclast precursors by increasing M-CSF-induced ERK activation, which in turn leads to accelerated osteoclast formation. Together, our findings demonstrate that FSTL1 is a secreted osteoclastogenic factor that plays a critical role in osteoclast formation via the NF-κB and MAPKs signaling pathways.
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Affiliation(s)
- Hyun-Ju Kim
- Department of Biomedical Science, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, Clinical Trial Center, School of Medicine, Kyungpook National University and Hospital, Daegu 41944, Republic of Korea; Skeletal Diseases Genome Research Center, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea.
| | - Woo Youl Kang
- Department of Biomedical Science, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, Clinical Trial Center, School of Medicine, Kyungpook National University and Hospital, Daegu 41944, Republic of Korea
| | - Sook Jin Seong
- Department of Biomedical Science, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, Clinical Trial Center, School of Medicine, Kyungpook National University and Hospital, Daegu 41944, Republic of Korea
| | - Shin-Yoon Kim
- Skeletal Diseases Genome Research Center, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea
| | - Mi-Sun Lim
- College of Pharmacy, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Young-Ran Yoon
- Department of Biomedical Science, Cell and Matrix Research Institute, BK21 Plus KNU Biomedical Convergence Program, Clinical Trial Center, School of Medicine, Kyungpook National University and Hospital, Daegu 41944, Republic of Korea.
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20
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Frenkel B, White W, Tuckermann J. Glucocorticoid-Induced Osteoporosis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015. [PMID: 26215995 DOI: 10.1007/978-1-4939-2895-8_8] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Osteoporosis is among the most devastating side effects of glucocorticoid (GC) therapy for the management of inflammatory and auto-immune diseases. Evidence from both humans and mice indicate deleterious skeletal effects within weeks of pharmacological GC administration, both related and unrelated to a decrease in bone mineral density (BMD). Osteoclast numbers and bone resorption are also rapidly increased, and together with osteoblast inactivation and decreased bone formation, these changes lead the fastest loss in BMD during the initial disease phase. Bone resorption then decreases to sub-physiological levels, but persistent and severe inhibition of bone formation leads to further bone loss and progressively increased fracture risk, up to an order of magnitude higher than that observed in untreated individuals. Bone forming osteoblasts are thus considered the main culprits in GC-induced osteoporosis (GIO). Accordingly, we focus this review primarily on deleterious effects on osteoblasts: inhibition of cell replication and function and acceleration of apoptosis. Mediating these adverse effects, GCs target pivotal regulatory mechanisms that govern osteoblast growth, differentiation and survival. Specifically, GCs inhibit growth factor pathways, including Insulin Growth Factors, Growth Hormone, Hepatocyte Growth/Scatter Factor and IL6-type cytokines. They also inhibit downstream kinases, including PI3-kinase and the MAP kinase ERK, the latter attributable in part to direct transcriptional stimulation of MAP kinase phosphatase 1. Most importantly, however, GCs inhibit the Wnt signaling pathway, which plays a pivotal role in osteoblast replication, function and survival. They transcriptionally stimulate expression of Wnt inhibitors of both the Dkk and Sfrp families, and they induce reactive oxygen species (ROS), which result in loss of ß-catenin to ROS-activated FoxO transcription factors. Identification of dissociated GCs, which would suppress the immune system without causing osteoporosis, is proving more challenging than initially thought, and GIO is currently managed by co-treatment with bisphosphonates or PTH. These drugs, however, are not ideally suited for GIO. Future therapeutic approaches may aim at GC targets such as those mentioned above, or newly identified targets including the Notch pathway, the AP-1/Il11 axis and the osteoblast master regulator RUNX2.
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Affiliation(s)
- Baruch Frenkel
- Department of Orthopaedic Surgery, Keck School of Medicine, Institute for Genetic Medicine, University of Southern California, 2250 Alcazar Street, CSC-240, Los Angeles, CA, 90033, USA,
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Kim HJ, Yoon HJ, Kim BK, Kang WY, Seong SJ, Lim MS, Kim SY, Yoon YR. G Protein-Coupled Receptor 120 Signaling Negatively Regulates Osteoclast Differentiation, Survival, and Function. J Cell Physiol 2015; 231:844-51. [PMID: 26280807 DOI: 10.1002/jcp.25133] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 08/12/2015] [Indexed: 12/20/2022]
Abstract
G protein-coupled receptor 120 (GPR120) plays an important role in the regulation of inflammation and lipid metabolism. In this study, we investigated the role of GPR120 in osteoclast development and found that GPR120 regulates osteoclast differentiation, survival and function. We observed that GPR120 was highly expressed in osteoclasts compared to their precursors, bone marrow-derived macrophages (BMMs). Activation of GPR120 by its ligand GW9508 suppressed receptor activator of NF- κB ligand (RANKL)-induced osteoclast differentiation and the expression of nuclear factor of activated T cells c1 (NFATc1), a key modulator of osteoclastogenesis. GPR120 activation further inhibited the RANKL-stimulated phosphorylation of IκBα and JNK. In addition to osteoclast differentiation, GPR120 activation increased the apoptosis of mature osteoclasts by inducing caspase-3 and Bim expression. Activation of GPR120 also interfered with cell spreading and actin cytoskeletal organization mediated by M-CSF but not by RANKL. Coincident with the impaired cytoskeletal organization, GPR120 activation blocked osteoclast bone resorbing activity. Furthermore, knockdown of GPR120 using small hairpin RNA abrogated all these inhibitory effects on osteoclast differentiation, survival, and function. Together, our findings identify GPR120 as a negative modulator of osteoclast development that may be an attractive therapeutic target for bone-destructive diseases. J. Cell. Physiol. 231: 844-851, 2016. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Hyun-Ju Kim
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
| | - Hye-Jin Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
| | - Bo Kyung Kim
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
| | - Woo Youl Kang
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
| | - Sook Jin Seong
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
| | - Mi-Sun Lim
- College of Pharmacy, Yeungnam University, Gyeonsan, Korea
| | - Shin-Yoon Kim
- Department of Orthopedic Surgery, Kyungpook National University School of Medicine, Daegu, Korea
| | - Young-Ran Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University School of Medicine, Daegu, Korea
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Kim HJ, Yoon HJ, Yoon KA, Gwon MR, Jin Seong S, Suk K, Kim SY, Yoon YR. Lipocalin-2 inhibits osteoclast formation by suppressing the proliferation and differentiation of osteoclast lineage cells. Exp Cell Res 2015; 334:301-9. [PMID: 25814363 DOI: 10.1016/j.yexcr.2015.03.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/12/2015] [Accepted: 03/14/2015] [Indexed: 01/28/2023]
Abstract
Lipocalin-2 (LCN2) is a member of the lipocalin superfamily and plays a critical role in the regulation of various physiological processes, such as inflammation and obesity. In this study, we report that LCN2 negatively modulates the proliferation and differentiation of osteoclast precursors, resulting in impaired osteoclast formation. The overexpression of LCN2 in bone marrow-derived macrophages or the addition of recombinant LCN2 protein inhibits the formation of multinuclear osteoclasts. LCN2 suppresses macrophage colony-stimulating factor (M-CSF)-induced proliferation of osteoclast precursor cells without affecting their apoptotic cell death. Interestingly, LCN2 decreases the expression of the M-CSF receptor, c-Fms, and subsequently blocks its downstream signaling cascades. In addition, LCN2 inhibits RANKL-induced osteoclast differentiation and attenuates the expression of c-Fos and nuclear factor of activated T cells c1 (NFATc1), which are important modulators in osteoclastogenesis. Mechanistically, LCN2 inhibits NF-κB signaling pathways, as demonstrated by the suppression of IκBα phosphorylation, nuclear translocation of p65, and NF-κB transcriptional activity. Thus, LCN2 is an anti-osteoclastogenic molecule that exerts its effects by retarding the proliferation and differentiation of osteoclast lineage cells.
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Affiliation(s)
- Hyun-Ju Kim
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea.
| | - Hye-Jin Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Kyung-Ae Yoon
- Department of Orthopedic Surgery, Skeletal Diseases Genome Research Center, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Mi-Ri Gwon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Sook Jin Seong
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Kyoungho Suk
- Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Shin-Yoon Kim
- Department of Orthopedic Surgery, Skeletal Diseases Genome Research Center, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Young-Ran Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea.
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Kim HJ, Hong J, Yoon HJ, Yoon YR, Kim SY. Carboxypeptidase E is a novel modulator of RANKL-induced osteoclast differentiation. Mol Cells 2014; 37:685-90. [PMID: 25220258 PMCID: PMC4179137 DOI: 10.14348/molcells.2014.0179] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 07/29/2014] [Accepted: 07/30/2014] [Indexed: 12/03/2022] Open
Abstract
Osteoclasts are large polykaryons that have the unique capacity to degrade bone and are generated by the differentiation of myeloid lineage progenitors. To identify the genes involved in osteoclast development, we performed microarray analysis, and we found that carboxypeptidase E (CPE), a prohormone processing enzyme, was highly upregulated in osteoclasts compared with their precursors, bone marrow-derived macrophages (BMMs). Here, we demonstrate a novel role for CPE in receptor activator of NF-κB ligand (RANKL)-induced osteoclast differentiation. The overexpression of CPE in BMMs increases the formation of tartrate-resistant acid phosphatase (TRAP)-positive multinuclear osteoclasts and the expression of c-Fos and nuclear factor of activated T cells c1 (NFATc1), which are key regulators in osteoclastogenesis. Furthermore, employing CPE knockout mice, we show that CPE deficiency attenuates osteoclast formation. Together, our data suggest that CPE might be an important modulator of RANKL-induced osteoclast differentiation.
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Affiliation(s)
- Hyun-Ju Kim
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, School of Medicine, Kyungpook National University, Daegu 700-422, Korea
- Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu 700-412, Korea
| | - JungMin Hong
- Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu 700-412, Korea
| | - Hye-Jin Yoon
- Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu 700-412, Korea
| | - Young-Ran Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, Clinical Trial Center, School of Medicine, Kyungpook National University, Daegu 700-422, Korea
| | - Shin-Yoon Kim
- Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu 700-412, Korea
- Department of Orthopedic Surgery, School of Medicine, Kyungpook National University, Daegu 700-422, Korea
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Kim HJ, Yoon HJ, Kim SY, Yoon YR. A medium-chain fatty acid, capric acid, inhibits RANKL-induced osteoclast differentiation via the suppression of NF-κB signaling and blocks cytoskeletal organization and survival in mature osteoclasts. Mol Cells 2014; 37:598-604. [PMID: 25134536 PMCID: PMC4145371 DOI: 10.14348/molcells.2014.0153] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 07/02/2014] [Accepted: 07/07/2014] [Indexed: 01/13/2023] Open
Abstract
Fatty acids, important components of a normal diet, have been reported to play a role in bone metabolism. Osteoclasts are bone-resorbing cells that are responsible for many bone-destructive diseases such as osteoporosis. In this study, we investigated the impact of a medium-chain fatty acid, capric acid, on the osteoclast differentiation, function, and survival induced by receptor activator of NF-κB ligand (RANKL) and macrophage colony-stimulating factor (MCSF). Capric acid inhibited RANKL-mediated osteoclastogenesis in bone marrow-derived macrophages and suppressed RANKL-induced IκBα phosphorylation, p65 nuclear translocation, and NF-κB transcriptional activity. Capric acid further blocked the RANKL-stimulated activation of ERK without affecting JNK or p38. The induction of NFATc1 in response to RANKL was also attenuated by capric acid. In addition, capric acid abrogated M-CSF and RANKL-mediated cytoskeleton reorganization, which is crucial for the efficient bone resorption of osteoclasts. Capric acid also increased apoptosis in mature osteoclasts through the induction of Bim expression and the suppression of ERK activation by M-CSF. Together, our results reveal that capric acid has inhibitory effects on osteoclast development. We therefore suggest that capric acid may have potential therapeutic implications for the treatment of bone resorption-associated disorders.
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Affiliation(s)
- Hyun-Ju Kim
- Department of Molecular Medicine, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu 700-422,
Korea
- Clinical Trial Center, Kyungpook National University Hospital, Daegu 700-721,
Korea
| | - Hye-Jin Yoon
- Clinical Trial Center, Kyungpook National University Hospital, Daegu 700-721,
Korea
| | - Shin-Yoon Kim
- Department of Orthopedic Surgery, School of Medicine, Kyungpook National University, Daegu 700-422,
Korea
| | - Young-Ran Yoon
- Department of Molecular Medicine, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu 700-422,
Korea
- Clinical Trial Center, Kyungpook National University Hospital, Daegu 700-721,
Korea
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Hong JM, Kang KS, Yi HG, Kim SY, Cho DW. Electromagnetically controllable osteoclast activity. Bone 2014; 62:99-107. [PMID: 24556539 DOI: 10.1016/j.bone.2014.02.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 02/06/2014] [Accepted: 02/07/2014] [Indexed: 12/17/2022]
Abstract
The time-varying electromagnetic field (EMF) has been widely studied as one of the exogenous stimulation methods for improving bone healing. Our previous study showed that osteogenic differentiation of adipose-derived stem cells was accelerated by a 45-Hz EMF, whereas a 7.5-Hz EMF inhibited osteogenic marker expression. Accordingly, we hypothesized that each negative and positive condition for the osteogenic differentiation could inversely influence osteoclast formation and differentiation. Here, we demonstrated that osteoclast formation, differentiation, and activity can be regulated by altering the frequency of the electromagnetic stimulation, such as 7.5 (negative for osteogenic differentiation) and 45 Hz (positive for osteogenic differentiation). A 45 Hz EMF inhibited osteoclast formation whereas a 7.5-Hz EMF induced differentiation and activity. Osteoclastogenic markers, such as NFATc1, TRAP, CTSK, MMP9, and DC-STAMP were highly expressed under the 7.5-Hz EMF, while they were decreased at 45 Hz. We found that the 7.5-Hz EMF directly regulated osteoclast differentiation through ERK and p38 MAPK activation, whereas the EMF at 45 Hz suppressed RANKL-induced phosphorylation of IκB. Additionally, actin ring formation with tubules and bone resorptive activity were enhanced at 7.5 Hz through increased integrin β3 expression. However, these were inhibited at 45 Hz. Although many questions remain unanswered, our study indicates that osteoclast formation and differentiation were controllable using physical tools, such as an EMF. It will now be of great interest to study the ill-defined correlation between electromagnetic conditions and osteoclast activities, which eventually could lead to determining the therapeutic characteristics of an EMF that will treat bone-related diseases.
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Affiliation(s)
- Jung Min Hong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
| | - Kyung Shin Kang
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
| | - Hee-Gyeong Yi
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
| | - Shin-Yoon Kim
- Department of Orthopedic Surgery, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Dong-Woo Cho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
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Kim HJ, Hong JM, Yoon HJ, Kwon BM, Choi JY, Lee IK, Kim SY. Inhibitory effects of obovatol on osteoclast differentiation and bone resorption. Eur J Pharmacol 2014; 723:473-80. [DOI: 10.1016/j.ejphar.2013.10.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 10/02/2013] [Accepted: 10/16/2013] [Indexed: 12/12/2022]
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Kim HJ, Yoon HJ, Choi JY, Lee IK, Kim SY. The tyrosine kinase inhibitor GNF-2 suppresses osteoclast formation and activity. J Leukoc Biol 2013; 95:337-45. [PMID: 24130113 DOI: 10.1189/jlb.0713356] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
GNF-2, a tyrosine kinase inhibitor, was developed to overcome imatinib-resistant mutations found in CML patients. Osteoclasts are the principal bone-resorbing cells that are responsible for bone diseases, such as osteoporosis, tumor-induced osteolysis, and metastatic cancers. In this study, we investigated the effect of GNF-2 on osteoclast development induced by RANKL and M-CSF. We found that GNF-2 inhibited osteoclast differentiation from BMMs. GNF-2 suppressed RANKL-induced NF-κB transcriptional activity and the induction of c-Fos and NFATc1, which are two key transcription factors in osteoclastogenesis. We also observed that GNF-2 dose-dependently inhibited the proliferation of osteoclast precursors through the suppression of the M-CSFR c-Fms. In addition, GNF-2 accelerated osteoclast apoptosis by inducing caspase-3 and Bim expression. Furthermore, GNF-2 interfered with actin cytoskeletal organization and subsequently blocked the bone-resorbing activity of mature osteoclasts. In agreement with its in vitro effects, GNF-2 reduced osteoclast number and bone loss in a mouse model of LPS-induced bone destruction. Taken together, our data reveal that GNF-2 possesses anti-bone-resorptive properties, suggesting that GNF-2 may have therapeutic value for the treatment of bone-destructive disorders that can occur as a result of excessive osteoclastic bone resorption.
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Affiliation(s)
- Hyun-Ju Kim
- 1.Kyungpook National University and Hospital, 44-2 Samduk 2-ga, Jung-gu, Daegu 700-412, South Korea. (H.-J. Kim) or (S.-Y. Kim)
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