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Zhang W, Mao YQ, Wang H, Yin WJ, Zhu SX, Wang WC. MiR-124 suppresses cell motility and adhesion by targeting talin 1 in prostate cancer cells. Cancer Cell Int 2015; 15:49. [PMID: 25969668 PMCID: PMC4427999 DOI: 10.1186/s12935-015-0189-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 03/23/2015] [Indexed: 12/19/2022] Open
Abstract
Background MicroRNA is a type of endogenous non-coding RNA implicated in various cellular processes, and has been intensely investigated in the field of cancer research for many years. Here, we investigated the functions and mechanisms of miR-124 in prostate cancer, which is a putative tumor suppressor reported in many carcinomas. Methods Using bioinformatics, talin 1 was indicated as a potential target of miR-124. We examined the expression levels of miR-124 and talin 1 in tissue specimens and cell lines. To explore the relationship between miR-124 and talin 1, miR-124 mimics, miR-124 inhibitors, and talin 1 small interfering RNA (siRNA) were transiently transfected into cancer cell lines, followed by analysis using luciferase reporter assays. Next, to investigate the functions of miR-124 in prostate cancer, we performed cell attachment, migration, and invasion assays. A rescue experiment was also conducted to demonstrate whether miR-124 suppressed cell adhesion and motility by targeting talin 1. Finally, we examined the related signaling pathways of miR-124 and talin 1. Results MiR-124 was down-regulated in prostate cancer specimens and cell lines, while talin 1 was over-expressed in prostate cancer specimens and cell lines. These results showed an inverse correlation of miR-124 and talin 1 expression. Similar to talin 1 siRNA, overexpression of miR-124 by transient transfection of mimics led to a significant decrease in talin 1 levels. Luciferase report assays showed that the seed sequence of the talin 1 3’-untranslated region was a target of miR-124. Functional investigations revealed anti-attachment, anti-migration, and invasion-promoting effects of miR-124 in prostate cancer cells. The rescue experiment confirmed that miR-124 exerted its biological functions by targeting talin 1. Finally, we found that miR-124 and talin 1 impaired cellular adhesion and motility through integrins and the focal adhesion kinase/Akt pathway. Conclusions Our study demonstrated biological roles and the related mechanism of miR-124 in prostate cancer. The results indicate that talin 1 is very likely a novel player in the anti-metastatic signaling network of miR-124. By down-regulation of talin 1, miR-124 impairs the adhesion, migration, and invasion of prostate cancer cells.
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Affiliation(s)
- Wei Zhang
- Department of Urology, Zhejiang Cancer Hospital, 38 Guangji Road, Hangzhou, Zhejiang 310000 China
| | - Ye-Qing Mao
- Department of Urology, The First Affiliated Hospital of Zhejiang University, 79 Qinchun Road, Hangzhou, Zhejiang 310003 China
| | - Hua Wang
- Department of Urology, Zhejiang Cancer Hospital, 38 Guangji Road, Hangzhou, Zhejiang 310000 China
| | - Wen-Juan Yin
- Department of Pathology, Zhejiang Cancer Hospital, 38 Guangji Road, Hangzhou, Zhejiang 310000 China
| | - Shao-Xing Zhu
- Department of Urology, Zhejiang Cancer Hospital, 38 Guangji Road, Hangzhou, Zhejiang 310000 China
| | - Wei-Cheng Wang
- Medical equipment research institute of Zhejiang, 23 Huacheng Road, Hangzhou, Zhejiang 310000 China
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Sun KT, Chen MYC, Tu MG, Wang IK, Chang SS, Li CY. MicroRNA-20a regulates autophagy related protein-ATG16L1 in hypoxia-induced osteoclast differentiation. Bone 2015; 73:145-53. [PMID: 25485521 DOI: 10.1016/j.bone.2014.11.026] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 11/25/2014] [Accepted: 11/29/2014] [Indexed: 12/13/2022]
Abstract
Autophagy and autophagy-related proteins (ATGs) play decisive roles in osteoclast differentiation. Emerging lines of evidence show the deregulation of miRNA in autophagic responses. However, the role of hypoxia and involvement of miRNA in osteoclast differentiation are unclear. In the present study, we demonstrate that hypoxia caused induction of autophagy and osteoclast differentiation markers in RAW264.7 cells stimulated with M-CSF and RANKL. In addition, miR-20a was significantly repressed during hypoxia and identified as the prime candidate involved in hypoxia-induced osteoclast differentiation. The results from dual luciferase reporter assay revealed that miR-20a directly targets Atg16l1 by binding to its 3'UTR end. Further, miR-20a transfection studies showed significant down regulation of autophagic proteins (LC3-II and ATG16L1) and osteoclast differentiation markers (Nfatc1, Traf6, and Trap) thus confirming the functional role of miR-20a under hypoxic conditions. Results of chromatin immunoprecipitation assay showed that HIF-1α binds to miRNA-20a. From miRNA Q-PCR results, we confirmed that shRNA HIF-1α knockdown significantly downregulated both autophagy (LC3, p62, Atg5, Atg12, Atg16l1, Atg7, Becn1, Atg9a) and osteoclast markers (Traf6, Nfatc1, Ctsk, cFos, Mmp9, Trap) in RAW264.7 cells. Thus, our findings suggest that the regulatory axis of HIF-1α-miRNA-20a-Atg16l1 might be a critical mechanism for hypoxia-induced osteoclast differentiation.
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Affiliation(s)
- Kuo-Ting Sun
- Graduate Institute of Clinical Medical Science, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan; Department of Pediatric Dentistry, China Medical University Hospital, No. 2 Yu-Der Rd., Taichung, Taiwan; School of Dentistry, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan
| | - Michael Y C Chen
- School of Dentistry, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan; Department of Oral & Maxillofacial Surgeon, China Medical University Hospital, No. 2 Yu-Der Rd., Taichung, Taiwan
| | - Ming-Gene Tu
- School of Dentistry, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan
| | - I-Kuan Wang
- Graduate Institute of Clinical Medical Science, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan; Division of Nephrology, Department of medicine, China Medical University Hospital, No. 2 Yu-Der Rd., Taichung, Taiwan
| | - Shih-Sheng Chang
- Graduate Institute of Clinical Medical Science, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan; Division of Cardiology, Department of medicine, China Medical University Hospital, No. 2 Yu-Der Rd., Taichung, Taiwan
| | - Chi-Yuan Li
- Graduate Institute of Clinical Medical Science, China Medical University, No. 91 Hsueh-Shih Rd., Taichung, Taiwan; Department of Anesthesiology, China Medical University Hospital, No. 2 Yu-Der Rd., Taichung, Taiwan.
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Epithelial Plasticity in Cancer: Unmasking a MicroRNA Network for TGF-β-, Notch-, and Wnt-Mediated EMT. JOURNAL OF ONCOLOGY 2015; 2015:198967. [PMID: 25883651 PMCID: PMC4390187 DOI: 10.1155/2015/198967] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 10/23/2014] [Indexed: 01/23/2023]
Abstract
Epithelial-to-mesenchymal transition (EMT) is a reversible process by which cancer cells can switch from a sessile epithelial phenotype to an invasive mesenchymal state. EMT enables tumor cells to become invasive, intravasate, survive in the circulation, extravasate, and colonize distant sites. Paracrine heterotypic stroma-derived signals as well as paracrine homotypic or autocrine signals can mediate oncogenic EMT and contribute to the acquisition of stem/progenitor cell properties, expansion of cancer stem cells, development of therapy resistance, and often lethal metastatic disease. EMT is regulated by a variety of stimuli that trigger specific intracellular signalling pathways. Altered microRNA (miR) expression and perturbed signalling pathways have been associated with epithelial plasticity, including oncogenic EMT. In this review we analyse and describe the interaction between experimentally validated miRs and their target genes in TGF-β, Notch, and Wnt signalling pathways. Interestingly, in this process, we identified a “signature” of 30 experimentally validated miRs and a cluster of validated target genes that seem to mediate the cross talk between TGF-β, Notch, and Wnt signalling networks during EMT and reinforce their connection to the regulation of epithelial plasticity in health and disease.
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Qadir AS, Um S, Lee H, Baek K, Seo BM, Lee G, Kim GS, Woo KM, Ryoo HM, Baek JH. miR-124 Negatively Regulates Osteogenic Differentiation and In vivo Bone Formation of Mesenchymal Stem Cells. J Cell Biochem 2015; 116:730-42. [DOI: 10.1002/jcb.25026] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 11/21/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Abdul S. Qadir
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Soyoun Um
- Department of Dental Science; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Heesu Lee
- Department of Oral Anatomy; Research Institute of Oral Science; College of Dentistry; Gangneung-Wonju National University; Gangwondo 210-702 Korea
| | - Kyunghwa Baek
- Department of Pharmacology; Research Institute of Oral Science; College of Dentistry, Gangneung-Wonju National University; Gangwondo 210-702 Korea
| | - Byoung Moo Seo
- Department of Oral and Maxillofacial Surgery; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Gene Lee
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Gwan-Shik Kim
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Kyung Mi Woo
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Hyun-Mo Ryoo
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
| | - Jeong-Hwa Baek
- Department of Molecular Genetics; School of Dentistry and Dental Research Institute; Seoul National University; Seoul 110-744 Korea
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Biomaterials mediated microRNA delivery for bone tissue engineering. Int J Biol Macromol 2015; 74:404-12. [DOI: 10.1016/j.ijbiomac.2014.12.034] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 12/11/2022]
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Rossi M, Calimeri T, Tagliaferri P, Tassone P. Multiple myeloma-related bone disease: state-of-art and next future treatments. Int J Hematol Oncol 2015. [DOI: 10.2217/ijh.14.45] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
SUMMARY Multiple myeloma (MM) is a plasma cell malignancy associated with the development of life-threatening and/or severe osteolytic lesions, which significantly worsen the quality of life of affected patients. MM-related bone disease (BD) is the result of an overwhelming osteoclastic activity, while osteoblast-mediated bone formation is inhibited. Bisphosphonates are still the mainstay of therapy for BD. However, these drugs are associated with mid long-term sequelae. In this work, we review the pathogenesis and currently available therapies of MM-related BD. We describe the most recent and promising findings that may translate in changing the clinical practice in the next future.
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Affiliation(s)
- Marco Rossi
- Department of Experimental & Clinical Medicine, Magna Graecia University & Medical Oncology Unit, T. Campanella Cancer Center, Salvatore Venuta University Campus, Catanzaro, Italy
| | - Teresa Calimeri
- Department of Experimental & Clinical Medicine, Magna Graecia University & Medical Oncology Unit, T. Campanella Cancer Center, Salvatore Venuta University Campus, Catanzaro, Italy
| | - Pierosandro Tagliaferri
- Department of Experimental & Clinical Medicine, Magna Graecia University & Medical Oncology Unit, T. Campanella Cancer Center, Salvatore Venuta University Campus, Catanzaro, Italy
| | - Pierfrancesco Tassone
- Department of Experimental & Clinical Medicine, Magna Graecia University & Medical Oncology Unit, T. Campanella Cancer Center, Salvatore Venuta University Campus, Catanzaro, Italy
- Sbarro Institute for Cancer Research & Molecular Medicine, Center for Biotechnology, College of Science & Technology, Temple University, Philadelphia, PA 19122, USA
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Ma M, Luo S, Chen X, Yuan F, Cai J, Lu L, Yin F. Immune System-Related Differentially Expressed Genes, Transcription Factors and microRNAs in Post-Menopausal Females with Osteopenia. Scand J Immunol 2015; 81:214-20. [PMID: 25565391 DOI: 10.1111/sji.12266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 12/14/2014] [Indexed: 11/30/2022]
Affiliation(s)
- M. Ma
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
| | - S. Luo
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
| | - X. Chen
- Department of Gynecology and Obstetrics; Shanghai East Hospital; Tongji University; Shanghai China
| | - F. Yuan
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
| | - J. Cai
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
| | - L. Lu
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
| | - F. Yin
- Department of Orthopaedic Surgery; Shanghai East Hospital; Tongji University; Shanghai China
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Kim K, Kim JH, Kim I, Lee J, Seong S, Park YW, Kim N. MicroRNA-26a regulates RANKL-induced osteoclast formation. Mol Cells 2015; 38:75-80. [PMID: 25518928 PMCID: PMC4314121 DOI: 10.14348/molcells.2015.2241] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 10/06/2014] [Accepted: 10/17/2014] [Indexed: 12/19/2022] Open
Abstract
Osteoclasts are unique cells responsible for the resorption of bone matrix. MicroRNAs (miRNAs) are involved in the regulation of a wide range of physiological processes. Here, we examined the role of miR-26a in RANKL-induced osteoclastogenesis. The expression of miR-26a was up-regulated by RANKL at the late stage of osteoclastogenesis. Ectopic expression of an miR-26a mimic in osteoclast precursor cells attenuated osteoclast formation, actin-ring formation, and bone resorption by suppressing the expression of connective tissue growth factor/CCN family 2 (CTGF/CCN2), which can promote osteoclast formation via up-regulation of dendritic cell-specific transmembrane protein (DC-STAMP). On the other hand, overexpression of miR-26a inhibitor enhanced RANKL-induced osteoclast formation and function as well as CTGF expression. In addition, the inhibitory effect of miR-26a on osteoclast formation and function was prevented by treatment with recombinant CTGF. Collectively, our results suggest that miR-26a modulates osteoclast formation and function through the regulation of CTGF.
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Affiliation(s)
- Kabsun Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
| | - Jung Ha Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
| | - Inyoung Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
| | - Jongwon Lee
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
| | - Semun Seong
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
| | | | - Nacksung Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju 501-746,
Korea
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Nakamachi Y, Ohnuma K, Uto K, Noguchi Y, Saegusa J, Kawano S. MicroRNA-124 inhibits the progression of adjuvant-induced arthritis in rats. Ann Rheum Dis 2015; 75:601-8. [DOI: 10.1136/annrheumdis-2014-206417] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 12/21/2014] [Indexed: 01/22/2023]
Abstract
ObjectiveMicroRNAs (miRNAs) are small endogenous, non-coding RNAs that act as post-transcriptional regulators. We analysed the in vivo effect of miRNA-124 (miR-124, the rat analogue of human miR-124a) on adjuvant-induced arthritis (AIA) in rats.MethodsAIA was induced in Lewis rats by injecting incomplete Freund's adjuvant with heat-killed Mycobacterium tuberculosis. Precursor (pre)-miR-124 was injected into the right hind ankle on day 9. Morphological changes in the ankle joint were assessed by micro-CT and histopathology. Cytokine expression was examined by western blotting and real-time RT-PCR. The effect of miR-124 on predicted target messenger RNAs (mRNAs) was examined by luciferase reporter assays. The effect of pre-miR-124 or pre-miR-124a on the differentiation of human osteoclasts was examined by tartrate-resistant acid phosphatase staining.ResultsWe found that miR-124 suppressed AIA in rats, as demonstrated by decreased synoviocyte proliferation, leucocyte infiltration and cartilage or bone destruction. Osteoclast counts and expression level of receptor activator of the nuclear factor κB ligand (RANKL), integrin β1 (ITGB1) and nuclear factor of activated T cells cytoplasmic 1 (NFATc1) were reduced in AIA rats treated with pre-miR-124. Luciferase analysis showed that miR-124 directly targeted the 3′UTR of the rat NFATc1, ITGB1, specificity protein 1 and CCAAT/enhancer-binding protein α mRNAs. Pre-miR-124 also suppressed NFATc1 expression in RAW264.7 cells. Both miR-124 and miR-124a directly targeted the 3′-UTR of human NFATc1 mRNA, and both pre-miR-124 and pre-miR-124a suppressed the differentiation of human osteoclasts.ConclusionsWe found that miR-124 ameliorated AIA by suppressing critical prerequisites for arthritis development, such as RANKL and NFATc1. Thus, miR-124a is a candidate for therapeutic use for human rheumatoid arthritis.
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de la Rica L, García-Gómez A, Comet NR, Rodríguez-Ubreva J, Ciudad L, Vento-Tormo R, Company C, Álvarez-Errico D, García M, Gómez-Vaquero C, Ballestar E. NF-κB-direct activation of microRNAs with repressive effects on monocyte-specific genes is critical for osteoclast differentiation. Genome Biol 2015; 16:2. [PMID: 25601191 PMCID: PMC4290566 DOI: 10.1186/s13059-014-0561-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 12/04/2014] [Indexed: 12/12/2022] Open
Abstract
Background Monocyte-to-osteoclast conversion is a unique terminal differentiation process that is exacerbated in rheumatoid arthritis and bone metastasis. The mechanisms implicated in upregulating osteoclast-specific genes involve transcription factors, epigenetic regulators and microRNAs (miRNAs). It is less well known how downregulation of osteoclast-inappropriate genes is achieved. Results In this study, analysis of miRNA expression changes in osteoclast differentiation from human primary monocytes revealed the rapid upregulation of two miRNA clusters, miR-212/132 and miR-99b/let-7e/125a. We demonstrate that they negatively target monocyte-specific and immunomodulatory genes like TNFAIP3, IGF1R and IL15. Depletion of these miRNAs inhibits osteoclast differentiation and upregulates their targets. These miRNAs are also upregulated in other inflammatory monocytic differentiation processes. Most importantly, we demonstrate for the first time the direct involvement of Nuclear Factor kappa B (NF-κB) in the regulation of these miRNAs, as well as with their targets, whereby NF-κB p65 binds the promoters of these two miRNA clusters and NF-κB inhibition or depletion results in impaired upregulation of their expression. Conclusions Our results reveal the direct involvement of NF-κB in shutting down certain monocyte-specific genes, including some anti-inflammatory activities, through a miRNA-dependent mechanism for proper osteoclast differentiation. Electronic supplementary material The online version of this article (doi:10.1186/s13059-014-0561-5) contains supplementary material, which is available to authorized users.
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Abstract
Osteoclasts are unique cells that degrade the bone matrix. These large multinucleated cells differentiate from the monocyte/macrophage lineage upon stimulation by two essential cytokines, macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-kappa B (NF-κB) ligand (RANKL). Activation of transcription factors such as microphthalmia transcription factor (MITF), c-Fos, NF-κB, and nuclear factor-activated T cells c1 (NFATc1) is required for sufficient osteoclast differentiation. In particular, NFATc1 plays the role of a master transcription regulator of osteoclast differentiation. To date, several mechanisms, including transcription, methylation, ubiquitination, acetylation, and non-coding RNAs, have been shown to regulate expression and activation of NFATc1. In this review, we have summarized the various mechanisms that control NFATc1 regulation during osteoclast differentiation.
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Affiliation(s)
- Jung Ha Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju, Korea
| | - Nacksung Kim
- Department of Pharmacology, Medical Research Center for Gene Regulation, Chonnam National University Medical School, Gwangju, Korea
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Shi C, Qi J, Huang P, Jiang M, Zhou Q, Zhou H, Kang H, Qian N, Yang Q, Guo L, Deng L. MicroRNA-17/20a inhibits glucocorticoid-induced osteoclast differentiation and function through targeting RANKL expression in osteoblast cells. Bone 2014; 68:67-75. [PMID: 25138550 DOI: 10.1016/j.bone.2014.08.004] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/12/2014] [Accepted: 08/12/2014] [Indexed: 12/26/2022]
Abstract
Glucocorticoids act on the osteoblasts to up-regulate the expression of RANKL, which is very important in the etiology of glucocorticoid-induced osteoclast differentiation and bone resorption. The mechanisms of this process are still not completely understood. Recent studies have shown that glucocorticoids mediate osteoblast function by decreasing the expression of microRNA-17-92a cluster. Coincidentally, we found that the microRNA-17/20a (microRNA-17, microRNA-20a) seed sequences were also complementary to a sequence conserved in the 3'- untranslated region of RANKL mRNA. Therefore, we hypothesized that glucocorticoids might promote osteoblast-derived RANKL expression by down-regulating microRNA-17/20a, which favors differentiation and function of the osteoclasts. In the present study, Western blot analysis showed that microRNA-17/20a markedly lowered the levels of RANKL protein and attenuated dexamethasone-induced RANKL expression in the osteoblasts. The post-transcriptional repression of RANKL by microRNA-17/20a was further confirmed by the luciferase reporter assay. Furthermore, we found that dexamethasone-induced osteoclast differentiation and function were significantly attenuated in co-culture with osteoblast over-expressed microRNA-17/20a and osteoclast progenitors. These results showed that microRNA-17/20a may play a significant role in glucocorticoid-induced osteoclast differentiation and function by targeting the RANKL expression in osteoblast cells.
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Affiliation(s)
- Changgui Shi
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University of China, Shanghai, China.
| | - Jin Qi
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China.
| | - Ping Huang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Min Jiang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Qi Zhou
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Hanbing Zhou
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Hui Kang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Niandong Qian
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Qiumeng Yang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Lei Guo
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China.
| | - Lianfu Deng
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
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Franceschetti T, Dole NS, Kessler CB, Lee SK, Delany AM. Pathway analysis of microRNA expression profile during murine osteoclastogenesis. PLoS One 2014; 9:e107262. [PMID: 25222202 PMCID: PMC4164525 DOI: 10.1371/journal.pone.0107262] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 08/13/2014] [Indexed: 01/08/2023] Open
Abstract
To design novel therapeutics against bone loss, understanding the molecular mechanisms regulating osteoclastogenesis is critical. Osteoclast formation and function are tightly regulated by transcriptional, post-transcriptional and post-translational mechanisms. This stringent regulation is crucial to prevent excessive or insufficient bone resorption and to maintain bone homeostasis. microRNAs (miRNAs) are key post-transcriptional regulators that repress expression of target mRNAs controlling osteoclast proliferation, differentiation, and apoptosis. Disruption of miRNA-mediated regulation alters osteoclast formation and bone resorption. Prior studies profiled miRNA expression in murine osteoclast precursors treated with RANKL for 24 hours. However, a more complete miRNA signature, encompassing early, mid and late stages of osteoclastogenesis, is wanting. An Agilent microarray platform was used to analyze expression of mature miRNAs in an enriched population of murine bone marrow osteoclast precursors (depleted of B220+ and CD3+ cells) undergoing 1, 3, or 5 days of RANKL-driven differentiation. Expression of 93 miRNAs, changed by >2 fold during early, mid, and late stages of osteoclastogenesis, were identified and sorted into 7 clusters. We validated the function and expression of miR-365, miR-451, and miR-99b, which were found in distinct clusters. Inhibition of miR-365 increased osteoclast number but decreased osteoclast size, while miR-99b inhibition decreased both osteoclast number and size. In contrast, overexpression of miR-451 had no effect. Computational analyses predicted mTOR, PI3 kinase/AKT, cell-matrix interactions, actin cytoskeleton organization, focal adhesion, and axon guidance pathways to be top targets of several miRNA clusters. This suggests that many miRNA clusters differentially expressed during osteoclastogenesis converge on some key functional pathways. Overall, our study is unique in that we identified miRNAs differentially expressed during early, mid, and late osteoclastogenesis in a population of primary mouse bone marrow cells enriched for osteoclast progenitors. This novel data set contributes to our understanding of the molecular mechanisms regulating the complex process of osteoclast differentiation.
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Affiliation(s)
- Tiziana Franceschetti
- Center for Molecular Medicine, University of Connecticut Health Center, Farmington, Connecticut, United States of America
| | - Neha S. Dole
- Center for Molecular Medicine, University of Connecticut Health Center, Farmington, Connecticut, United States of America
| | - Catherine B. Kessler
- Center for Molecular Medicine, University of Connecticut Health Center, Farmington, Connecticut, United States of America
| | - Sun-Kyeong Lee
- Center on Aging, University of Connecticut Health Center, Farmington, Connecticut, United States of America
| | - Anne M. Delany
- Center for Molecular Medicine, University of Connecticut Health Center, Farmington, Connecticut, United States of America
- * E-mail:
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Dou C, Zhang C, Kang F, Yang X, Jiang H, Bai Y, Xiang J, Xu J, Dong S. MiR-7b directly targets DC-STAMP causing suppression of NFATc1 and c-Fos signaling during osteoclast fusion and differentiation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1839:1084-96. [PMID: 25123438 DOI: 10.1016/j.bbagrm.2014.08.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2014] [Revised: 07/31/2014] [Accepted: 08/04/2014] [Indexed: 01/08/2023]
Abstract
DC-STAMP is a key regulating molecule of osteoclastogenesis and osteoclast precursor (OCP) fusion. Emerging lines of evidence showed that microRNAs play crucial roles in bone metabolism and osteoclast differentiation, but no microRNA has yet been reported to be directly related to OCPs fusion. Through a microarray, we found that the expression of miR-7b in RAW264.7 cells was significantly decreased after induction with M-CSF and RANKL. The overexpression of miR-7b in RAW264.7 cells attenuated the number of TRAP-positive cells number and the formation of multinucleated cells, whereas the inhibition of miR-7b enhanced osteoclastogenesis. Through a dual luciferase reporter assay, we confirmed that miR-7b directly targets DC-STAMP. Other fusogenic molecules, such as CD47, ATP6v0d2, and OC-STAMP, were detected to be down-regulated in accordance with the inhibition of DC-STAMP. Because DC-STAMP also participates in osteoclast differentiation through the ITAM-ITIM network, multiple osteoclast-specific genes in the ITAM-ITIM network were detected to identify how DC-STAMP is involved in this process. The results showed that molecules associated with the ITAM-ITIM network, such as NFATc1 and OSCAR, which are crucial in osteoclastogenesis, were consistently altered due to DC-STAMP inhibition. These findings suggest that miR-7b inhibits osteoclastogenesis and cell-cell fusion by directly targeting DC-STAMP. In addition, the inhibition of DC-STAMP and its downstream signals changed the expression of other fusogenic genes and key regulating genes, such as Nfatc1, c-fos, Akt, Irf8, Mapk1, and Traf6. In conclusion, our findings indicate that miR-7b may be a potential therapeutic target for the treatment of osteoclast-related bone disorders.
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Affiliation(s)
- Ce Dou
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China; National & Regional United Engineering Laboratory of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Chengcheng Zhang
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Fei Kang
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Xiaochao Yang
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Hong Jiang
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Yan Bai
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Junyu Xiang
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China
| | - Jianzhong Xu
- National & Regional United Engineering Laboratory of Tissue Engineering, Department of Orthopedics, Southwest Hospital, Third Military Medical University, Chongqing, China.
| | - Shiwu Dong
- Department of Biomedical Materials Science, School of Biomedical Engineering, Third Military Medical University, Chongqing, China.
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116
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Gámez B, Rodriguez-Carballo E, Ventura F. MicroRNAs and post-transcriptional regulation of skeletal development. J Mol Endocrinol 2014; 52:R179-97. [PMID: 24523514 DOI: 10.1530/jme-13-0294] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
MicroRNAs (miRNAs) have become integral nodes of post-transcriptional control of genes that confer cellular identity and regulate differentiation. Cell-specific signaling and transcriptional regulation in skeletal biology are extremely dynamic processes that are highly reliant on dose-dependent responses. As such, skeletal cell-determining genes are ideal targets for quantitative regulation by miRNAs. So far, large amounts of evidence have revealed a characteristic temporal miRNA signature in skeletal cell differentiation and confirmed the essential roles that numerous miRNAs play in bone development and homeostasis. In addition, microarray expression data have provided evidence for their role in several skeletal pathologies. Mouse models in which their expression is altered have provided evidence of causal links between miRNAs and bone abnormalities. Thus, a detailed understanding of the function of miRNAs and their tight relationship with bone diseases would constitute a powerful tool for early diagnosis and future therapeutic approaches.
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Affiliation(s)
- Beatriz Gámez
- Departament de Ciències Fisiològiques II, Universitat de Barcelona, IDIBELL, C/Feixa Llarga s/n, E-08907 L'Hospitalet de Llobregat, Spain
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117
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van der Eerden BCJ. MicroRNAs in the skeleton: cell-restricted or potent intercellular communicators? Arch Biochem Biophys 2014; 561:46-55. [PMID: 24832391 DOI: 10.1016/j.abb.2014.04.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 04/24/2014] [Accepted: 04/26/2014] [Indexed: 12/25/2022]
Abstract
MicroRNAs (miRNAs) play a fundamental role in cell proliferation, differentiation and apoptosis and have been associated with many diseases and physiological states. Within the skeleton, both the bone forming cells, osteoblasts, and the bone degrading cells, osteoclasts, are mostly being stimulated by miRNAs through downregulation of inhibitors of bone cell differentiation. Besides miRNAs affecting master genes of bone cell differentiation and function in a cell-restricted manner, evidence is gathering that miRNAs are excreted into the local environment but also into the circulation, implicating a role for miRNAs in nearby or even distant target cells. In this review, the most recent novel miRNAs implicated in bone cell differentiation regulation will be described but also their potential paracrine or endocrine role, thus reinforcing the concept that miRNAs may function as powerful communicators between cell types or tissues.
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