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Jiang T, Xia T, Qiao F, Wang N, Jiang Y, Xin H. Role and Regulation of Transcription Factors in Osteoclastogenesis. Int J Mol Sci 2023; 24:16175. [PMID: 38003376 PMCID: PMC10671247 DOI: 10.3390/ijms242216175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 11/01/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
Bones serve mechanical and defensive functions, as well as regulating the balance of calcium ions and housing bone marrow.. The qualities of bones do not remain constant. Instead, they fluctuate throughout life, with functions increasing in some situations while deteriorating in others. The synchronization of osteoblast-mediated bone formation and osteoclast-mediated bone resorption is critical for maintaining bone mass and microstructure integrity in a steady state. This equilibrium, however, can be disrupted by a variety of bone pathologies. Excessive osteoclast differentiation can result in osteoporosis, Paget's disease, osteolytic bone metastases, and rheumatoid arthritis, all of which can adversely affect people's health. Osteoclast differentiation is regulated by transcription factors NFATc1, MITF, C/EBPα, PU.1, NF-κB, and c-Fos. The transcriptional activity of osteoclasts is largely influenced by developmental and environmental signals with the involvement of co-factors, RNAs, epigenetics, systemic factors, and the microenvironment. In this paper, we review these themes in regard to transcriptional regulation in osteoclastogenesis.
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Affiliation(s)
- Tao Jiang
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
- School of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Tianshuang Xia
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Fangliang Qiao
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Nani Wang
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine, Hangzhou 310007, China;
| | - Yiping Jiang
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
| | - Hailiang Xin
- School of Pharmacy, Naval Medical University, Shanghai 200433, China; (T.J.); (T.X.); (F.Q.)
- School of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
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Sun J, Chen W, Li S, Yang S, Zhang Y, Hu X, Qiu H, Wu J, Xu S, Chu T. Nox4 Promotes RANKL-Induced Autophagy and Osteoclastogenesis via Activating ROS/PERK/eIF-2α/ATF4 Pathway. Front Pharmacol 2021; 12:751845. [PMID: 34650437 PMCID: PMC8505706 DOI: 10.3389/fphar.2021.751845] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 09/13/2021] [Indexed: 12/22/2022] Open
Abstract
Receptor activator of nuclear factor-κB ligand (RANKL) has been found to induce osteoclastogenesis and bone resorption. However, the underlying molecular mechanisms remain unclear. Via conducting a series of biochemical experiments with in vitro cell lines, this study investigated the role and mechanism of NADPH oxidase 4 (Nox4) in RANKL-induced autophagy and osteoclastogenesis. In the current study, we found that RANKL dramatically induced autophagy and osteoclastogenesis, inhibition of autophagy with chloroquine (CQ) markedly attenuates RANKL-induced osteoclastogenesis. Interestingly, we found that the protein level of Nox4 was remarkably upregulated by RANKL treatment. Inhibition of Nox4 by 5-O-methyl quercetin or knockdown of Nox4 with specific shRNA markedly attenuated RANKL-induced autophagy and osteoclastogenesis. Furthermore, we found that Nox4 stimulated the production of nonmitochondrial reactive oxygen species (ROS), activating the critical unfolded protein response (UPR)-related signaling pathway PERK/eIF-2α/ATF4, leading to RANKL-induced autophagy and osteoclastogenesis. Blocking the activation of PERK/eIF-2α/ATF4 signaling pathway either by Nox4 shRNA, ROS scavenger (NAC) or PERK inhibitor (GSK2606414) significantly inhibited autophagy during RANKL-induced osteoclastogenesis. Collectively, this study reveals that Nox4 promotes RANKL-induced autophagy and osteoclastogenesis via activating ROS/PERK/eIF-2α/ATF4 pathway, suggesting that the pathway may be a novel potential therapeutic target for osteoclastogenesis-related disease.
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Affiliation(s)
- Jing Sun
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Wugui Chen
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Songtao Li
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Sizhen Yang
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Ying Zhang
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Xu Hu
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Hao Qiu
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Jigong Wu
- Department of Spinal Surgery, 306 Hospital of PLA, Beijing, China
| | - Shangcheng Xu
- The Center of Laboratory Medicine, The Sixth People's Hospital of Chongqing, Chongqing, China
| | - Tongwei Chu
- Department of Orthopedics, Xinqiao Hospital of Army Medical University, Chongqing, China
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Zhang J, Mou Y, Gong H, Chen H, Xiao H. Microphthalmia-Associated Transcription Factor in Senescence and Age-Related Diseases. Gerontology 2021; 67:708-717. [PMID: 33940580 DOI: 10.1159/000515525] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 02/27/2021] [Indexed: 02/05/2023] Open
Abstract
Although microphthalmia-associated transcription factor (MITF) has been known for decades as a key regulator for melanocytic differentiation, recent studies expanded its other roles in multiple biological processes. Among these newfound roles, the relationship between MITF and aging is attractive; however, the underlying mechanism remains elusive. Here, we review the documented cues that highlight the implication of MITF in the aging process and particularly discuss the possible mechanisms underlying the participation of MITF in cellular senescence. First, it summarizes the association of MITF with melanocytic senescence, including the roles of MITF in cell cycle regulation, DNA damage repair, oxidative stress response, and the generation of senescence-associated secretory phenotype. Then, it collects the information involving MITF-related senescent changes in nonmelanocytes, such as retinal pigment epithelium cells, osteoclasts, and cardiomyocytes. This review may deepen the understanding of MITF function and be helpful to develop new strategies for improving geriatric health.
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Affiliation(s)
- Jian Zhang
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Yi Mou
- Geroscience and Chronic Disease Department, The 8th Municipal Hospital for the People, Chengdu, China
| | - Hui Gong
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Honghan Chen
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Hengyi Xiao
- Lab for Aging Research, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, China
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Pang M, Rodríguez-Gonzalez M, Hernandez M, Recinos CC, Seldeen KL, Troen BR. AP-1 and Mitf interact with NFATc1 to stimulate cathepsin K promoter activity in osteoclast precursors. J Cell Biochem 2019; 120:12382-12392. [PMID: 30816596 DOI: 10.1002/jcb.28504] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 12/12/2018] [Accepted: 12/14/2018] [Indexed: 11/08/2022]
Abstract
Cathepsin K (CTSK) is a secreted protease that plays an essential role in osteoclastic bone resorption and osteoporotic bone loss. We have previously shown that activator protein 1 (AP-1) stimulates CTSK promoter activity and that proximal nuclear factor of activated T cells cytoplasmic 1 (NFATc1)-binding sites play a major role in the stimulation of CTSK gene expression by receptor activator of NFκB ligand (RANKL). In the present study, we have extended these observations and further dissected the effects of transcription factors involved in the regulation of CTSK gene expression. Our aim was to investigate the cooperative interplay among transcription factors AP-1, microphthalmia-associated transcription factor (Mitf), and NFATc1, and the consequent regulatory effects on CTSK transcription. Experiments were carried out in RAW 264.7 cells, which can be readily differentiated to osteoclasts upon RANKL stimulation. Our data show that AP-1, Mitf, and NFATc1 are capable of independently stimulating CTSK promoter activity. A combination of any two factors further enhances CTSK promoter activity, with the combination of AP-1 (c-fos/c-jun) and NFATc1 inducing the largest increase. We further identify a synergistic effect when all three factors cooperate intimately at the proximal promoter region, yielding maximal transcriptional upregulation of the CTSK promoter. RANKL induces temporal localization of AP-1 and NFATc1 to the CTSK promoter. These results suggest that the interaction of multiple transcription factors mediate a maximal response to RANKL-induced CTSK gene expression.
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Affiliation(s)
- Manhui Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Maria Rodríguez-Gonzalez
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Mireya Hernandez
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Claudia Carolina Recinos
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System Research Service, Buffalo, New York
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Kim CJ, Shin SH, Kim BJ, Kim CH, Kim JH, Kang HM, Park BS, Kim IR. The Effects of Kaempferol-Inhibited Autophagy on Osteoclast Formation. Int J Mol Sci 2018; 19:ijms19010125. [PMID: 29301320 PMCID: PMC5796074 DOI: 10.3390/ijms19010125] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/29/2017] [Accepted: 12/31/2017] [Indexed: 12/24/2022] Open
Abstract
Kaempferol, a flavonoid compound, is derived from the rhizome of Kaempferia galanga L., which is used in traditional medicine in Asia. Autophagy has pleiotropic functions that are involved in cell growth, survival, nutrient supply under starvation, defense against pathogens, and antigen presentation. There are many studies dealing with the inhibitory effects of natural flavonoids in bone resorption. However, no studies have explained the relationship between the autophagic and inhibitory processes of osteoclastogenesis by natural flavonoids. The present study was undertaken to investigate the inhibitory effects of osteoclastogenesis through the autophagy inhibition process stimulated by kaempferol in murin macrophage (RAW 264.7) cells. The cytotoxic effect of Kaempferol was investigated by MTT assay. The osteoclast differentiation and autophagic process were confirmed via tartrate-resistant acid phosphatase (TRAP) staining, pit formation assay, western blot, and real-time PCR. Kaempferol controlled the expression of autophagy-related factors and in particular, it strongly inhibited the expression of p62/SQSTM1. In the western blot and real time-PCR analysis, when autophagy was suppressed with the application of 3-Methyladenine (3-MA) only, osteoclast and apoptosis related factors were not significantly affected. However, we found that after cells were treated with kaempferol, these factors inhibited autophagy and activated apoptosis. Therefore, we presume that kaempferol-inhibited autophagy activated apoptosis by degradation of p62/SQSTM1. Further study of the p62/SQSTM1 gene as a target in the autophagy mechanism, may help to delineate the potential role of kaempferol in the treatment of bone metabolism disorders.
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Affiliation(s)
- Chang-Ju Kim
- Department of Oral and Maxillofacial Surgery, Pusan National University Dental Hospital, 20, Geumo-ro, Mulgeum-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
| | - Sang-Hun Shin
- Department of Oral and Maxillofacial Surgery, Pusan National University Dental Hospital, 20, Geumo-ro, Mulgeum-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
| | - Bok-Joo Kim
- Department of Oral and Maxillofacial Surgery, Medical center, Dong-A University, 26, Daesingongwon-ro, Seo-gu, Busan 49201, Korea.
| | - Chul-Hoon Kim
- Department of Oral and Maxillofacial Surgery, Medical center, Dong-A University, 26, Daesingongwon-ro, Seo-gu, Busan 49201, Korea.
| | - Jung-Han Kim
- Department of Oral and Maxillofacial Surgery, Medical center, Dong-A University, 26, Daesingongwon-ro, Seo-gu, Busan 49201, Korea.
| | - Hae-Mi Kang
- BK21 PLUS Project, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
| | - Bong-Soo Park
- BK21 PLUS Project, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
| | - In-Ryoung Kim
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup, Yangsan-si 50612, Gyeongsangnam-do, Korea.
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Novack DV, Mbalaviele G. Osteoclasts-Key Players in Skeletal Health and Disease. Microbiol Spectr 2016; 4:10.1128/microbiolspec.MCHD-0011-2015. [PMID: 27337470 PMCID: PMC4920143 DOI: 10.1128/microbiolspec.mchd-0011-2015] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Indexed: 12/12/2022] Open
Abstract
The differentiation of osteoclasts (OCs) from early myeloid progenitors is a tightly regulated process that is modulated by a variety of mediators present in the bone microenvironment. Once generated, the function of mature OCs depends on cytoskeletal features controlled by an αvβ3-containing complex at the bone-apposed membrane and the secretion of protons and acid-protease cathepsin K. OCs also have important interactions with other cells in the bone microenvironment, including osteoblasts and immune cells. Dysregulation of OC differentiation and/or function can cause bone pathology. In fact, many components of OC differentiation and activation have been targeted therapeutically with great success. However, questions remain about the identity and plasticity of OC precursors and the interplay between essential networks that control OC fate. In this review, we summarize the key principles of OC biology and highlight recently uncovered mechanisms regulating OC development and function in homeostatic and disease states.
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Affiliation(s)
- Deborah Veis Novack
- Musculoskeletal Research Center, Division of Bone and Mineral Diseases, Department of Medicine
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110
| | - Gabriel Mbalaviele
- Musculoskeletal Research Center, Division of Bone and Mineral Diseases, Department of Medicine
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Li RF, Chen G, Ren JG, Zhang W, Wu ZX, Liu B, Zhao Y, Zhao YF. The adaptor protein p62 is involved in RANKL-induced autophagy and osteoclastogenesis. J Histochem Cytochem 2014; 62:879-88. [PMID: 25163928 DOI: 10.1369/0022155414551367] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Previous studies have implicated autophagy in osteoclast differentiation. The aim of this study was to investigate the potential role of p62, a characterized adaptor protein for autophagy, in RANKL-induced osteoclastogenesis. Real-time quantitative PCR and western blot analyses were used to evaluate the expression levels of autophagy-related markers during RANKL-induced osteoclastogenesis in mouse macrophage-like RAW264.7 cells. Meanwhile, the potential relationship between p62/LC3 localization and F-actin ring formation was tested using double-labeling immunofluorescence. Then, the expression of p62 in RAW264.7 cells was knocked down using small-interfering RNA (siRNA), followed by detecting its influence on RANKL-induced autophagy activation, osteoclast differentiation, and F-actin ring formation. The data showed that several key autophagy-related markers including p62 were significantly altered during RANKL-induced osteoclast differentiation. In addition, the expression and localization of p62 showed negative correlation with LC3 accumulation and F-actin ring formation, as demonstrated by western blot and immunofluorescence analyses, respectively. Importantly, the knockdown of p62 obviously attenuated RANKL-induced expression of autophagy- and osteoclastogenesis-related genes, formation of TRAP-positive multinuclear cells, accumulation of LC3, as well as formation of F-actin ring. Our study indicates that p62 may play essential roles in RANKL-induced autophagy and osteoclastogenesis, which may help to develop a novel therapeutic strategy against osteoclastogenesis-related diseases.
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Affiliation(s)
- Rui-Fang Li
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Gang Chen
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Jian-Gang Ren
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Wei Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Zhong-Xing Wu
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Bing Liu
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Yi Zhao
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
| | - Yi-Fang Zhao
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology (RFL, GC, JGR, WZ, ZXW, BL, YZ, YFZ) Wuhan University, Wuhan, ChinaDepartment of Oral and Maxillofacial Surgery, School & Hospital of Stomatology (GC, ZXW, BL, YFZ) Wuhan University, Wuhan, ChinaDepartment of Prosthodontics, School & Hospital of Stomatology (YZ) Wuhan University, Wuhan, China
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Lu SY, Li M, Lin YL. Mitf regulates osteoclastogenesis by modulating NFATc1 activity. Exp Cell Res 2014; 328:32-43. [PMID: 25152440 DOI: 10.1016/j.yexcr.2014.08.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 07/25/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
Abstract
Transcription factors Mitf and NFATc1 share many downstream targets that are critical for osteoclastogenesis. Since RANKL signals induce/activate both NFATc1 and Mitf isoform-E (Mitf-E), a tissue-restricted Mitf isoform in osteoclasts, it is plausible that the two factors work together to promote osteoclastogenesis. Although Mitf was shown to function upstream of NFATc1 previously, this study showed that expression of Mitf had little effects on NFATc1 and NFATc1 was critical for the induction of Mitf-E. In Mitf(mi/mi) mice, the semi-dominant mutation in Mitf gene leads to arrest of osteoclastogenesis in the early stages. However, when stimulated by RANKL, the Mitf(mi/mi) preosteoclasts responded with a significant induction of NFATc1, despite that the cells cannot differentiate into functional osteoclasts. In the absence of RANKL stimulation, very high levels of NFATc1 are required to drive osteoclast development. Our data indicate that Mitf functions downstream of NFATc1 in the RANKL pathway, and it plays an important role in amplifying NFATc1-dependent osteoclastogenic signals, which contributes to the significant synergy between the two factors during osteoclastogenesis. We propose that Mitf-E functions as a tissue-specific modulator for events downstream of NFATc1 activation during osteoclastogenesis.
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Affiliation(s)
- Ssu-Yi Lu
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA.
| | - Mengtao Li
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA; CHS 23-087, 10833 Le Conte Ave., Los Angeles, CA 90095, USA.
| | - Yi-Ling Lin
- Department of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, CA, USA; Gene Regulation Program, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA.
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