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Yu G, Fu X, Gong A, Gu J, Zou H, Yuan Y, Song R, Ma Y, Bian J, Liu Z, Tong X. Oligomeric proanthocyanidins ameliorates osteoclastogenesis through reducing OPG/RANKL ratio in chicken's embryos. Poult Sci 2024; 103:103706. [PMID: 38631227 PMCID: PMC11040129 DOI: 10.1016/j.psj.2024.103706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 03/25/2024] [Accepted: 03/26/2024] [Indexed: 04/19/2024] Open
Abstract
Skeletal disorders can seriously threaten the health and the performance of poultry, such as tibial dyschondroplasia (TD) and osteoporosis (OP). Oligomeric proanthocyanidins (OPC) are naturally occurring polyphenolic flavonoid compounds that can be used as potential substances to improve the bone health and the growth performance of poultry. Eighty 7-day-old green-eggshell yellow feather layer chickens were randomly divided into 4 groups: basal diet and basal diet supplementation with 25, 50, and 100 mg/kg OPC. The results have indicated that the growth performance and bone parameters of chickens were significantly improved supplementation with OPC in vivo, including the bone volume (BV), the bone mineral density (BMD) and the activities of antioxidative enzymes, but ratio of osteoprotegerin (OPG)/receptor activator of NF-κB (RANK) ligand (RANKL) was decreased. Furthermore, primary bone marrow mesenchymal stem cells (BMSCs) and bone marrow monocytes/macrophages (BMMs) were successfully isolated from femur and tibia of chickens, and co-cultured to differentiate into osteoclasts in vitro. The osteogenic differentiation derived from BMSCs was promoted treatment with high concentrations of OPC (10, 20, and 40 µmol/L) groups in vitro, but emerging the inhibition of osteoclastogenesis by increasing the ratio of OPG/RANKL. In contrary, the osteogenic differentiation was also promoted treatment with low concentrations of OPC (2.5, 5, and 10 µmol/L) groups, but osteoclastogenesis was enhanced by decreasing the ratio of OPG/RANKL in vitro. In addition, OPG inhibits the differentiation and activity of osteoclasts by increasing the autophagy in vitro. Dietary supplementation of OPC can improve the growth performance of bone and alter the balance of osteoblasts and osteoclasts, thereby improving the bone health of chickens.
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Affiliation(s)
- Gengsheng Yu
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Xiaohui Fu
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Anqing Gong
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Jianhong Gu
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Hui Zou
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Yan Yuan
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Ruilong Song
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Yonggang Ma
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Jianchun Bian
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Zongping Liu
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China
| | - Xishuai Tong
- Institute of Agricultural Science and Technology Development (Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China) / College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, P. R. China; Jiangsu Key Laboratory of Zoonosis, Yangzhou 225009, Jiangsu, P. R. China.
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Jiang M, Wu W, Xiong Z, Yu X, Ye Z, Wu Z. Targeting autophagy drug discovery: Targets, indications and development trends. Eur J Med Chem 2024; 267:116117. [PMID: 38295689 DOI: 10.1016/j.ejmech.2023.116117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/30/2023] [Accepted: 12/31/2023] [Indexed: 02/25/2024]
Abstract
Autophagy plays a vital role in sustaining cellular homeostasis and its alterations have been implicated in the etiology of many diseases. Drugs development targeting autophagy began decades ago and hundreds of agents were developed, some of which are licensed for the clinical usage. However, no existing intervention specifically aimed at modulating autophagy is available. The obstacles that prevent drug developments come from the complexity of the actual impact of autophagy regulators in disease scenarios. With the development and application of new technologies, several promising categories of compounds for autophagy-based therapy have emerged in recent years. In this paper, the autophagy-targeted drugs based on their targets at various hierarchical sites of the autophagic signaling network, e.g., the upstream and downstream of the autophagosome and the autophagic components with enzyme activities are reviewed and analyzed respectively, with special attention paid to those at preclinical or clinical trials. The drugs tailored to specific autophagy alone and combination with drugs/adjuvant therapies widely used in clinical for various diseases treatments are also emphasized. The emerging drug design and development targeting selective autophagy receptors (SARs) and their related proteins, which would be expected to arrest or reverse the progression of disease in various cancers, inflammation, neurodegeneration, and metabolic disorders, are critically reviewed. And the challenges and perspective in clinically developing autophagy-targeted drugs and possible combinations with other medicine are considered in the review.
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Affiliation(s)
- Mengjia Jiang
- Department of Pharmacology and Pharmacy, China Jiliang University, China
| | - Wayne Wu
- College of Osteopathic Medicine, New York Institute of Technology, USA
| | - Zijie Xiong
- Department of Pharmacology and Pharmacy, China Jiliang University, China
| | - Xiaoping Yu
- Department of Biology, China Jiliang University, China
| | - Zihong Ye
- Department of Biology, China Jiliang University, China
| | - Zhiping Wu
- Department of Pharmacology and Pharmacy, China Jiliang University, China.
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3
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Zhang F, Cheng T, Zhang SX. Mechanistic target of rapamycin (mTOR): a potential new therapeutic target for rheumatoid arthritis. Arthritis Res Ther 2023; 25:187. [PMID: 37784141 PMCID: PMC10544394 DOI: 10.1186/s13075-023-03181-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 09/25/2023] [Indexed: 10/04/2023] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease characterized by systemic synovitis and bone destruction. Proinflammatory cytokines activate pathways of immune-mediated inflammation, which aggravates RA. The mechanistic target of rapamycin (mTOR) signaling pathway associated with RA connects immune and metabolic signals, which regulates immune cell proliferation and differentiation, macrophage polarization and migration, antigen presentation, and synovial cell activation. Therefore, therapy strategies targeting mTOR have become an important direction of current RA treatment research. In the current review, we summarize the biological functions of mTOR, its regulatory effects on inflammation, and the curative effects of mTOR inhibitors in RA, thus providing references for the development of RA therapeutic targets and new drugs.
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Affiliation(s)
- Fen Zhang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, No. 382, Wuyi Road, Xinghualing District, Taiyuan, 030001, Shanxi Province, China
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi Province, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi Province, China
| | - Ting Cheng
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, No. 382, Wuyi Road, Xinghualing District, Taiyuan, 030001, Shanxi Province, China
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi Province, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi Province, China
| | - Sheng-Xiao Zhang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, No. 382, Wuyi Road, Xinghualing District, Taiyuan, 030001, Shanxi Province, China.
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi Province, China.
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi Province, China.
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Arnst J, Jing Z, Cohen C, Ha SW, Viggeswarapu M, Beck GR. Bioactive silica nanoparticles target autophagy, NF-κB, and MAPK pathways to inhibit osteoclastogenesis. Biomaterials 2023; 301:122238. [PMID: 37441901 PMCID: PMC10530178 DOI: 10.1016/j.biomaterials.2023.122238] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 06/28/2023] [Accepted: 07/02/2023] [Indexed: 07/15/2023]
Abstract
Spherical 50 nm silica-based nanoparticles (SiNPs) promote healthy bone homeostasis and maintenance by supporting bone forming osteoblast lineage cells while simultaneously inhibiting the differentiation of bone resorbing osteoclasts. Previous work demonstrated that an intraperitoneal injection of SiNPs in healthy mice - both young and old - increased bone density and quality, suggesting the possibility that SiNPs represent a dual action therapeutic. However, the underlying mechanisms governing the osteoclast response to SiNPs have yet to be fully explored and defined. Therefore, the goals of this study were to investigate the cellular and molecular mechanisms by which SiNPs inhibit osteoclastogenesis. SiNPs strongly inhibited RANKL-induced osteoclast differentiation within the first hours and concomitantly inhibited early transcriptional regulators such as Nfatc1. SiNPs simultaneously stimulated expression of autophagy related genes p62 and LC3β dependent on ERK1/2 signaling pathway. Intriguingly, SiNPs were found to stimulate autophagosome formation while inhibiting the autophagic flux necessary for RANKL-stimulated osteoclast differentiation, resulting in the inhibition of both the canonical and non-canonical NF-κB signaling pathways and stabilizing TRAF3. These results suggest a model in which SiNPs inhibit osteoclastogenesis by inhibiting the autophagic machinery and RANKL-dependent functionality. This mechanism of action defines a novel therapeutic strategy for inhibiting osteoclastogenesis.
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Affiliation(s)
- Jamie Arnst
- Emory University, Department of Medicine, Division of Endocrinology, Atlanta, GA, 30322, USA
| | - Zhaocheng Jing
- Emory University, Department of Medicine, Division of Endocrinology, Atlanta, GA, 30322, USA; The Second Hospital of Shandong University, Department of Orthopedics, Jinan, Shandong, 250033, China
| | - Cameron Cohen
- Emory University, Department of Medicine, Division of Endocrinology, Atlanta, GA, 30322, USA
| | - Shin-Woo Ha
- Emory University, Department of Medicine, Division of Endocrinology, Atlanta, GA, 30322, USA
| | - Manjula Viggeswarapu
- The Atlanta Department of Veterans Affairs Medical Center, Decatur, GA, 30033, USA
| | - George R Beck
- The Atlanta Department of Veterans Affairs Medical Center, Decatur, GA, 30033, USA; Emory University, Department of Medicine, Division of Endocrinology, Atlanta, GA, 30322, USA; The Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA, 30322, USA.
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5
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Feng C, Liu Y, Zhang BY, Zhang H, Shan FY, Li TQ, Zhao ZN, Wang XX, Zhang XY. Rapamycin Inhibits Osteoclastogenesis and Prevents LPS-Induced Alveolar Bone Loss by Oxidative Stress Suppression. ACS OMEGA 2023; 8:20739-20754. [PMID: 37323396 PMCID: PMC10268267 DOI: 10.1021/acsomega.3c01289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 05/18/2023] [Indexed: 06/17/2023]
Abstract
Periodontitis is a progressive inflammatory skeletal disease characterized by periodontal tissue destruction, alveolar bone resorption, and tooth loss. Chronic inflammatory response and excessive osteoclastogenesis play essential roles in periodontitis progression. Unfortunately, the pathogenesis that contributes to periodontitis remains unclear. As a specific inhibitor of the mTOR (mammalian/mechanistic target of rapamycin) signaling pathway and the most common autophagy activator, rapamycin plays a vital role in regulating various cellular processes. The present study investigated the effects of rapamycin on osteoclast (OC) formation in vitro and its effects on the rat periodontitis model. The results showed that rapamycin inhibited OC formation in a dose-dependent manner by up-regulating the Nrf2/GCLC signaling pathway, thus suppressing the intracellular redox status, as measured by 2',7'-dichlorofluorescein diacetate and MitoSOX. In addition, rather than simply increasing the autophagosome formation, rapamycin increased the autophagy flux during OC formation. Importantly, the anti-oxidative effect of rapamycin was regulated by an increase in autophagy flux, which could be attenuated by blocking autophagy with bafilomycin A1. In line with the in vitro results, rapamycin treatment attenuated alveolar bone resorption in rats with lipopolysaccharide-induced periodontitis in a dose-dependent manner, as assessed by micro-computed tomography, hematoxylin-eosin staining, and tartrate-resistant acid phosphatase staining. Besides, high-dose rapamycin treatment could reduce the serum levels of proinflammatory factors and oxidative stress in periodontitis rats. In conclusion, this study expanded our understanding of rapamycin's role in OC formation and protection from inflammatory bone diseases.
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Affiliation(s)
- Chong Feng
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Yan Liu
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
- Lanzhou
University, Lanzhou 730000, China
| | - Bao-Yi Zhang
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Hao Zhang
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Fa-Yu Shan
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Tian-Qi Li
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Zhi-Ning Zhao
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
| | - Xin-Xing Wang
- Tianjin
Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Xiang-Yu Zhang
- School
and Hospital of Stomatology, Tianjin Medical
University, Tianjin 300070, China
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Wang S, Wang J, Wang S, Tao R, Yi J, Chen M, Zhao Z. mTOR Signaling Pathway in Bone Diseases Associated with Hyperglycemia. Int J Mol Sci 2023; 24:ijms24119198. [PMID: 37298150 DOI: 10.3390/ijms24119198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/02/2023] [Accepted: 05/04/2023] [Indexed: 06/12/2023] Open
Abstract
The interplay between bone and glucose metabolism has highlighted hyperglycemia as a potential risk factor for bone diseases. With the increasing prevalence of diabetes mellitus worldwide and its subsequent socioeconomic burden, there is a pressing need to develop a better understanding of the molecular mechanisms involved in hyperglycemia-mediated bone metabolism. The mammalian target of rapamycin (mTOR) is a serine/threonine protein kinase that senses extracellular and intracellular signals to regulate numerous biological processes, including cell growth, proliferation, and differentiation. As mounting evidence suggests the involvement of mTOR in diabetic bone disease, we provide a comprehensive review of its effects on bone diseases associated with hyperglycemia. This review summarizes key findings from basic and clinical studies regarding mTOR's roles in regulating bone formation, bone resorption, inflammatory responses, and bone vascularity in hyperglycemia. It also provides valuable insights into future research directions aimed at developing mTOR-targeted therapies for combating diabetic bone diseases.
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Affiliation(s)
- Shuangcheng Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Jiale Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Shuangwen Wang
- West China School of Medicine, Sichuan University, Chengdu 610041, China
| | - Ran Tao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Jianru Yi
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Miao Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Zhihe Zhao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
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Tong X, Fu X, Yu G, Qu H, Zou H, Song R, Ma Y, Yuan Y, Bian J, Gu J, Liu Z. Polystyrene exacerbates cadmium-induced mitochondrial damage to lung by blocking autophagy in mice. ENVIRONMENTAL TOXICOLOGY 2023. [PMID: 37022104 DOI: 10.1002/tox.23804] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 03/09/2023] [Accepted: 03/27/2023] [Indexed: 06/19/2023]
Abstract
Cadmium (Cd) is an environmental heavy metal, and its accumulation is harmful to animal and human health. The cytotoxicity of Cd includes oxidative stress, apoptosis, and mitochondrial histopathological changes. Furthermore, polystyrene (PS) is a kind of microplastic piece derived from biotic and abiotic weathering courses, and has toxicity in various aspects. However, the potential mechanism of action of Cd co-treated with PS is still poorly unclear. The objective of this study was to investigate the effects of PS on Cd-induced histopathological injury of mitochondria in the lung of mice. In this study, the results have showed that Cd could induce the activity of oxidative enzymes of the lung cells in mice, increasing the content of partial microelement and the phosphorylation of inflammatory factor NF-κB p65. Cd further destroys the integrity of mitochondria by increasing the expression of apoptotic protein and blocking the autophagy. In addition, PS solely group aggravated the lung damage in mice, especially mitochondrial toxicity, and played a synergistic effect with Cd in lung injury. However, how PS can augment mitochondrial damage and synergism with Cd in lung of mice requiring further exploration. Therefore, PS was able to exacerbate Cd-induced mitochondrial damage to the lung in mice by blocking autophagy, and was associated with the apoptosis.
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Affiliation(s)
- Xishuai Tong
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Xiaohui Fu
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Gengsheng Yu
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Huayi Qu
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Hui Zou
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Ruilong Song
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Yonggang Ma
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Yan Yuan
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Jianchun Bian
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Jianhong Gu
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
| | - Zongping Liu
- Institutes of Agricultural Science and Technology Development (Joint International Research laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China)/College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, China
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Strontium Ranelate Inhibits Osteoclastogenesis through NF-κB-Pathway-Dependent Autophagy. Bioengineering (Basel) 2023; 10:bioengineering10030365. [PMID: 36978756 PMCID: PMC10045081 DOI: 10.3390/bioengineering10030365] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/17/2023] [Accepted: 03/08/2023] [Indexed: 03/19/2023] Open
Abstract
Strontium ranelate (SR) is a pharmaceutical agent used for the prevention and treatment of osteoporosis and fragility fracture. However, little attention has been paid to the effect of SR on alveolar bone remodeling during orthodontic tooth movement and its underlying mechanism. Here, we investigated the influence of SR on orthodontic tooth movement and tooth resorption in Sprague–Dawley rats and the relationship between the nuclear factor–kappa B (NF-κB) pathway, autophagy, and osteoclastogenesis after the administration of SR in vitro and in vivo. In this study, it was found that SR reduced the expression of autophagy-related proteins at the pressure side of the first molars during orthodontic tooth movement. Similarly, the expression of these autophagy-related proteins and the size and number of autophagosomes were downregulated by SR in vitro. The results also showed that SR reduced the number of osteoclasts and suppressed orthodontic tooth movement and root resorption in rats, which could be partially restored using rapamycin, an autophagy inducer. Autophagy was attenuated after pre-osteoclasts were treated with Bay 11-7082, an NF-κB pathway inhibitor, while SR reduced the expression of the proteins central to the NF-κB pathway. Collectively, this study revealed that SR might suppress osteoclastogenesis through NF-κB-pathway-dependent autophagy, resulting in the inhibition of orthodontic tooth movement and root resorption in rats, which might offer a new insight into the treatment of malocclusion and bone metabolic diseases.
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Song P, Chen T, Rui S, Duan X, Deng B, Armstrong DG, Ma Y, Deng W. Canagliflozin promotes osteoblastic MC3T3-E1 differentiation via AMPK/RUNX2 and improves bone microarchitecture in type 2 diabetic mice. Front Endocrinol (Lausanne) 2022; 13:1081039. [PMID: 36589840 PMCID: PMC9800613 DOI: 10.3389/fendo.2022.1081039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Individuals with type 2 diabetes mellitus (T2DM) have an increased risk of bone metabolic disorders and bone fracture due to disease progression and clinical treatment. The effect of sodium-glucose cotransporter 2 (SGLT2) inhibitors, now greatly prescribed for the treatment of T2DM, on bone metabolism is not clear. This study aimed to explore the possible influence of bone metabolic disorder and the underlying mechanism through a comparison of three different SGLT2 inhibitors (canagliflozin, dapagliflozin, and empagliflozin) in the treatment of type 2 diabetic mice. For the in vivo experiments, four groups (DM, DM+Cana, DM+Dapa, and DM+Empa) were established using micro-CT to detect the bone microarchitecture and bone-related parameters. The study results indicated that canagliflozin, but not dapagliflozin or empagliflozin, increased bone mineral density (p<0.05) and improved bone microarchitecture in type 2 diabetic mice. Furthermore, canagliflozin promoted osteoblast differentiation at a concentration of 5 μM under high glucose concentration (HG). Phosphorylated adenosine 5'-monophosphate (AMP)-activated protein kinase (AMPK) α (Thr172) has been confirmed to activate run-related transcription factor-2 (RUNX2) to perform this function. This effect can be partially reversed by the AMPK inhibitor dorsomorphin (compound C) and strengthened by the AMPK activator acadesine (AICAR) in vitro. The level trend of RUNX2 and p-AMPK in vivo were consistent with those in vitro. This study suggested that canagliflozin played a beneficial role in bone metabolism in type 2 diabetic mice compared with dapagliflozin and empagliflozin. It provides some theoretical support for the chosen drugs, especially for patients with osteoporosis or a high risk of fracture.
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Affiliation(s)
- Peiyang Song
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
| | - Tianyi Chen
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
| | - Shunli Rui
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
| | - Xiaodong Duan
- Department of Rehabilitation, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China
| | - Bo Deng
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
| | - David G. Armstrong
- Department of Surgery, Keck School of Medicine of University of Southern California, Los Angeles, CA, United States
| | - Yu Ma
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
| | - Wuquan Deng
- Department of Endocrinology, Chongqing Emergency Medical Center, Chongqing University Central Hospital, School of Medicine, Chongqing University, Chongqing, China
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10
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Choi EB, Agidigbi TS, Kang IS, Kim C. ERK Inhibition Increases RANKL-Induced Osteoclast Differentiation in RAW 264.7 Cells by Stimulating AMPK Activation and RANK Expression and Inhibiting Anti-Osteoclastogenic Factor Expression. Int J Mol Sci 2022; 23:13512. [PMID: 36362318 PMCID: PMC9656104 DOI: 10.3390/ijms232113512] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/20/2022] [Accepted: 10/30/2022] [Indexed: 08/13/2023] Open
Abstract
Bone absorption is necessary for the maintenance of bone homeostasis. An osteoclast (OC) is a monocyte-macrophage lineage cell that absorbs bone tissue. Extracellular signal-regulated kinases (ERKs) are known to play important roles in regulating OC growth and differentiation. In this study, we examined specific downstream signal pathways affected by ERK inhibition during OC differentiation. Our results showed that the ERK inhibitors PD98059 and U0126 increased receptor activator of NF-κB ligand (RANKL)-induced OC differentiation in RAW 264.7 cells, implying a negative role in OC differentiation. This is supported by the effect of ERK2-specific small interfering RNA on increasing OC differentiation. In contrast to our findings regarding the RAW 264.7 cells, the ERK inhibitors attenuated the differentiation of bone marrow-derived cells into OCs. The ERK inhibitors significantly increased the phosphorylation of adenosine 5'-monophosphate-activated protein kinase (AMPK) but not the activation of p38 MAPK, Lyn, and mTOR. In addition, while the ERK inhibition increased the expression of the RANKL receptor RANK, it decreased the expression of negative mediators of OC differentiation, such as interferon regulatory factor-8, B-cell lymphoma 6, and interferon-γ. These dichotomous effects of ERK inhibition suggest that while ERKs may play positive roles in bone marrow-derived cells, ERKs may also play negative regulatory roles in RAW 264.7 cells. These data provide important information for drug development utilizing ERK inhibitors in OC-related disease treatment.
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Affiliation(s)
- Eun-Bi Choi
- Laboratory for Leukocyte Signaling Research, Department of Pharmacology and Toxicology, College of Medicine, Inha University, Incheon 22212, Korea
- BK21 Program in Biomedical Science & Engineering, Inha University, Incheon 22212, Korea
| | - Taiwo Samuel Agidigbi
- Laboratory for Leukocyte Signaling Research, Department of Pharmacology and Toxicology, College of Medicine, Inha University, Incheon 22212, Korea
| | - In-Soon Kang
- Laboratory for Leukocyte Signaling Research, Department of Pharmacology and Toxicology, College of Medicine, Inha University, Incheon 22212, Korea
- BK21 Program in Biomedical Science & Engineering, Inha University, Incheon 22212, Korea
| | - Chaekyun Kim
- Laboratory for Leukocyte Signaling Research, Department of Pharmacology and Toxicology, College of Medicine, Inha University, Incheon 22212, Korea
- BK21 Program in Biomedical Science & Engineering, Inha University, Incheon 22212, Korea
- Convergent Research Center for Metabolism and Immunoregulation, Inha University, Incheon 22212, Korea
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11
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Kushwaha P, Alekos NS, Kim SP, Li Z, Wolfgang MJ, Riddle RC. Mitochondrial fatty acid β-oxidation is important for normal osteoclast formation in growing female mice. Front Physiol 2022; 13:997358. [PMID: 36187756 PMCID: PMC9515402 DOI: 10.3389/fphys.2022.997358] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 08/22/2022] [Indexed: 12/03/2022] Open
Abstract
Skeletal remodeling is an energy demanding process that is linked to nutrient availability and the levels of metabolic hormones. While recent studies have examined the metabolic requirements of bone formation by osteoblasts, much less is known about the energetic requirements of bone resorption by osteoclasts. The abundance of mitochondria in mature osteoclasts suggests that the production of an acidified micro-environment conducive to the ionization of hydroxyapatite, secretion of matrix-degrading enzymes, and motility during resorption requires significant energetic capacity. To investigate the contribution of mitochondrial long chain fatty acid β-oxidation to osteoclast development, we disrupted the expression of carnitine palmitoyltransferase-2 (Cpt2) in myeloid-lineage cells. Fatty acid oxidation increases dramatically in bone marrow cultures stimulated with RANKL and M-CSF and microCT analysis revealed that the genetic inhibition of long chain fatty acid oxidation in osteoclasts significantly increases trabecular bone volume in female mice secondary to reduced osteoclast numbers. In line with these data, osteoclast precursors isolated from Cpt2 mutants exhibit reduced capacity to form large-multinucleated osteoclasts, which was not rescued by exogenous glucose or pyruvate, and signs of an energetic stress response. Together, our data demonstrate that mitochondrial long chain fatty acid oxidation by the osteoclast is required for normal bone resorption as its inhibition produces an intrinsic defect in osteoclast formation.
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Affiliation(s)
- Priyanka Kushwaha
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Nathalie S. Alekos
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Soohyun P. Kim
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Zhu Li
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Michael J. Wolfgang
- Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Ryan C. Riddle
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States,Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, United States,Baltimore Veterans Administration Medical Center, Baltimore, MD, United States,*Correspondence: Ryan C. Riddle,
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12
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A Review of Signaling Transduction Mechanisms in Osteoclastogenesis Regulation by Autophagy, Inflammation, and Immunity. Int J Mol Sci 2022; 23:ijms23179846. [PMID: 36077242 PMCID: PMC9456406 DOI: 10.3390/ijms23179846] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 08/22/2022] [Accepted: 08/26/2022] [Indexed: 11/16/2022] Open
Abstract
Osteoclastogenesis is an ongoing rigorous course that includes osteoclast precursors fusion and bone resorption executed by degradative enzymes. Osteoclastogenesis is controlled by endogenous signaling and/or regulators or affected by exogenous conditions and can also be controlled both internally and externally. More evidence indicates that autophagy, inflammation, and immunity are closely related to osteoclastogenesis and involve multiple intracellular organelles (e.g., lysosomes and autophagosomes) and certain inflammatory or immunological factors. Based on the literature on osteoclastogenesis induced by different regulatory aspects, emerging basic cross-studies have reported the emerging disquisitive orientation for osteoclast differentiation and function. In this review, we summarize the partial potential therapeutic targets for osteoclast differentiation and function, including the signaling pathways and various cellular processes.
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13
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Tong X, Yu G, Liu Q, Zhang X, Bian J, Liu Z, Gu J. Puerarin alleviates cadmium-induced oxidative damage to bone by reducing autophagy in rats. ENVIRONMENTAL TOXICOLOGY 2022; 37:720-729. [PMID: 34897960 DOI: 10.1002/tox.23437] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 11/28/2021] [Accepted: 12/05/2021] [Indexed: 06/14/2023]
Abstract
Autophagy is a regulatory mechanism involved in cadmium (Cd)-induced bone toxicity and is suppressed by various stimuli, including oxidative stress. Puerarin is an isoflavonoid compound isolated from Pueraria, a plant used in traditional Chinese medicine. The underlying mechanisms of action of puerarin remain unclear. The objective of this study was to explore the mitigating effects of puerarin on cadmium-induced oxidative damage in the bones of rats. Cadmium exposure increased oxidative damage in rat bones; this was markedly decreased by puerarin treatment, as demonstrated by changes in the activity of antioxidative enzymes. Cadmium-induced blockage of the expression of key bone regulatory proteins, autophagy-related markers, and signaling molecules was also alleviated by puerarin treatment. Additionally, cadmium reduced expression of the autophagic protein Rab7 and of late endosomal/lysosomal adaptor and MAPK and mTOR activator 1 (LAMTOR1); the decrease in these proteins was not restored by puerarin treatment. We speculate that puerarin relieves the inhibition of fusion of autophagosomes with lysosomes that is induced by cadmium; however, this specific effect of puerarin and downstream effects on bone regulatory mechanisms require further investigation. In conclusion, puerarin alleviates cadmium-induced oxidative damage in the bones of rats by attenuating autophagy, which is likely associated with the antioxidant activity of puerarin.
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Affiliation(s)
- Xishuai Tong
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, P. R. China
| | - Gengsheng Yu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
| | - Qingyang Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
| | - Xueqing Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
| | - Jianchun Bian
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, P. R. China
| | - Zongping Liu
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, P. R. China
| | - Jianhong Gu
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, P. R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, P. R. China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, P. R. China
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14
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Choi JUA, Kijas AW, Lauko J, Rowan AE. The Mechanosensory Role of Osteocytes and Implications for Bone Health and Disease States. Front Cell Dev Biol 2022; 9:770143. [PMID: 35265628 PMCID: PMC8900535 DOI: 10.3389/fcell.2021.770143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 12/13/2021] [Indexed: 12/14/2022] Open
Abstract
Bone homeostasis is a dynamic equilibrium between bone-forming osteoblasts and bone-resorbing osteoclasts. This process is primarily controlled by the most abundant and mechanosensitive bone cells, osteocytes, that reside individually, within chambers of porous hydroxyapatite bone matrix. Recent studies have unveiled additional functional roles for osteocytes in directly contributing to local matrix regulation as well as systemic roles through endocrine functions by communicating with distant organs such as the kidney. Osteocyte function is governed largely by both biochemical signaling and the mechanical stimuli exerted on bone. Mechanical stimulation is required to maintain bone health whilst aging and reduced level of loading are known to result in bone loss. To date, both in vivo and in vitro approaches have been established to answer important questions such as the effect of mechanical stimuli, the mechanosensors involved, and the mechanosensitive signaling pathways in osteocytes. However, our understanding of osteocyte mechanotransduction has been limited due to the technical challenges of working with these cells since they are individually embedded within the hard hydroxyapatite bone matrix. This review highlights the current knowledge of the osteocyte functional role in maintaining bone health and the key regulatory pathways of these mechanosensitive cells. Finally, we elaborate on the current therapeutic opportunities offered by existing treatments and the potential for targeting osteocyte-directed signaling.
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Affiliation(s)
- Jung Un Ally Choi
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Amanda W Kijas
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Jan Lauko
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Alan E Rowan
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
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15
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Corrigendum. Cell Prolif 2021; 54:e13148. [PMID: 34897846 DOI: 10.1111/cpr.13148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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16
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Galectin-3 Contributes to the Inhibitory Effect of lα,25-(OH) 2D 3 on Osteoclastogenesis. Int J Mol Sci 2021; 22:ijms222413334. [PMID: 34948130 PMCID: PMC8708238 DOI: 10.3390/ijms222413334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/01/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022] Open
Abstract
The active form of vitamin D, 1α,25-(OH)2D3, not only promotes intestinal calcium absorption, but also regulates the formation of osteoclasts (OCs) and their capacity for bone mineral dissolution. Gal-3 is a newly discovered bone metabolic regulator involved in the proliferation, differentiation, and apoptosis of various cells. However, the role of galectin-3 (gal-3) in OC formation and the regulatory effects of 1α,25-(OH)2D3 have yet to be explored. To confirm whether gal-3 contributes to the regulatory effects of 1α,25-(OH)2D3 on osteoclastogenesis, osteoclast precursors (OCPs) were induced by macrophage colony stimulating factor (M-CSF) and receptor activator of nuclear factor κB ligand (RANKL). TRAP staining and bone resorption analyses were used to verify the formation and activation of OCs. qPCR, Western blotting, co-immunoprecipitation, and immunofluorescence assays were used to detect gene and protein expression. The regulatory effects of gal-3 in OC formation after treatment with 1α,25-(OH)2D3 were evaluated using gal-3 siRNA. The results showed that 1α,25-(OH)2D3 significantly increased gal-3 expression and inhibited OC formation and bone resorption. Expression levels of OC-related genes and proteins, matrix metalloproteinase 9 (MMP-9), nuclear factor of activated T cells 1 (NFATc1), and cathepsin K (Ctsk) were also inhibited by 1α,25-(OH)2D3. Gal-3 knockdown attenuated the inhibitory effects of 1α,25-(OH)2D3 on OC formation, activation, and gene and protein expression. In addition, gal-3 was co-localized with the vitamin D receptor (VDR). These data suggest that gal-3 contributes to the osteoclastogenesis inhibitory effect of lα,25-(OH)2D3, which is involved in bone and calcium homeostasis.
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17
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Probiotics Treatment of Leg Diseases in Broiler Chickens: a Review. Probiotics Antimicrob Proteins 2021; 14:415-425. [PMID: 34757604 DOI: 10.1007/s12602-021-09869-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/27/2021] [Indexed: 12/12/2022]
Abstract
Normal development and growth of bones are critical for poultry. With the rapid growth experienced by broiler chickens, higher incidences of leg weakness and lameness are common problems in adolescent meat-type poultry that present huge economic and welfare issues. Leg disorders such as angular bone deformities and tibial dyschondroplasia have become common in broilers and are associated with poor growth, high mortality rates, increased carcass condemnation, and downgrading at slaughter. Probiotics have shown promise for a variety of health purposes, including preventing diarrhea, elevating carcass quality, and promoting growth of the poultry. In addition, recent studies have indicated that probiotics can maintain the homeostasis of the gut microbiota and improve the health of the gastrointestinal tract, which confers a potentially beneficial effect on bone health. This review mainly describes the occurrence of broiler leg disease and the role of probiotics in bone health through regulating the gut microbiota and improving intestinal function, thus providing a relevant theoretical basis for probiotics to hinder the development of skeletal disorders in broiler chickens.
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18
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Zhang B, Luo C, Xiao W. Induction of osteoclast formation by LOX mutant (LOXG473A) through regulation of autophagy. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:1474. [PMID: 34734026 PMCID: PMC8506719 DOI: 10.21037/atm-21-4474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 09/18/2021] [Indexed: 11/16/2022]
Abstract
Background Lysyl oxidase (LOX) has been identified to modulate osteoclast activity, so we explored the role of LOXG473A, the highest frequency single nucleotide polymorphism in LOX, in osteoclast formation and its potential relationship to autophagy. Methods The ability of the LOX mutant, LOXG473A, to promote autophagy and osteoclast formation was evaluated in the pre-osteoclast cell line RAW264.7. Furthermore, autophagy-related protein expression and autophagosomes were detected by western blot and electron microscopy, respectively. Simultaneously, osteoclast formation and resorption ability were also detected using TRAP staining assay and bone resorption assay. In addition, the osteoclast-related proteins and mRNAs, as well as p-AMPKα and p-mTOR proteins, were further evaluated by western blot and qPCR assays. Results Autophagy inhibitor 3-MA suppressed the Beclin-1 and ATG5 protein levels and the ratio of LC3-II to LC3-I, as well as autophagosome formation in RAW264.7 transfected with the MUT plasmid and enhanced p62 protein expression. Simultaneously, 3-MA also reduced osteoclast formation and resorption, as well as the F-actin ring level of osteoclasts. In addition, 3-MA inhibited osteoclast-related protein and mRNA expression, including NFATC1, ACP5, CTSK. And the autophagy-related pathway protein p-AMPKα was increased and p-mTOR was reduced by 3-MA treatment. However, autophagy agonist RAPA reversed the effect of 3-MA on RAW264.7 with LOXG473A mutation, indicating that promoting autophagy could enhance the ability of LOXG473A to induce osteoclast formation. Conclusions LOX mutant (LOXG473A) might promote osteoclast formation for RAW264.7 by enhancing autophagy via the AMPK/mTOR pathway, which is a new direction for bone disease research.
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Affiliation(s)
- Bo Zhang
- Department of Radiology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Chenglin Luo
- Department of Gastroenterology, Suzhou Xiangcheng People's Hospital, Suzhou, China
| | - Wenjin Xiao
- Department of Endocrinology, Second Affiliated Hospital of Soochow University, Suzhou, China
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19
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Chen YH, Hsueh KK, Chu PW, Chen SK. AMP-activated protein kinase mediates lipopolysaccharide-induced proinflammatory responses and elevated bone resorption in differentiated osteoclasts. J Cell Biochem 2021; 123:275-288. [PMID: 34668232 PMCID: PMC9298072 DOI: 10.1002/jcb.30165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 09/23/2021] [Accepted: 10/06/2021] [Indexed: 12/05/2022]
Abstract
Systemic and intracellular metabolic states are critical factors affecting immune cell functions. The metabolic regulator AMP‐activated protein kinase (AMPK) senses AMP levels and mediates cellular responses to energy‐restrained conditions. The ubiquitously expressed AMPK participates in various biological functions in numerous cell types, including innate immune cell macrophages and osteoclasts, which are their specialized derivatives in bone tissues. Previous studies have demonstrated that the activation of AMPK promotes macrophage polarization toward anti‐inflammatory M2 status. Additionally, AMPK acts as a negative regulator of osteoclastogenesis, and upregulation of AMPK disrupts the differentiation of osteoclasts. However, the regulation and roles of AMPK in differentiated osteoclasts have not been characterized. Here, we report that inflammatory stimuli‐regulated‐AMPK activation of differentiated and undifferentiated osteoclasts in opposite ways. Lipopolysaccharide (LPS) inhibited the phosphorylation of AMPK in macrophages and undifferentiated osteoclasts, but it activated AMPK in differentiated osteoclasts. Inactivating AMPK decreased cellular responses against the activation of toll‐like receptor signaling, including the transcriptional activation of proinflammatory cytokines and the bone resorption genes TRAP, and MMP9. The elevation of bone resorption by LPS stimulation was disrupted by AMPK inhibitor, indicating the pivotal roles of AMPK in inflammation‐induced activities in differentiated osteoclasts. The AMPK activator metformin did not increase proinflammatory responses, possibly because other factors are also required for this regulation. Notably, changing the activation status of AMPK did not alter the expression levels of bone resorption genes in unstimulated osteoclasts, indicating the essential roles of AMPK in cellular responses to inflammatory stimuli but not in the maintenance of basal levels. Unlike its M2‐polarizing roles in macrophages, AMPK was not responsive to the M2 stimulus of interleukin‐4. Our observations revealed differences in the cellular properties of macrophages and osteoclasts as well as the complexity of regulatory mechanisms for osteoclast functions.
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Affiliation(s)
- Yu-Hsu Chen
- Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan.,Department of Orthopedics, Tri-Service General Hospital, National Defense Medical Center, Taipei City, Taiwan.,Department of Biology and Anatomy, National Defense Medical Center, Taipei City, Taiwan
| | - Kuang-Kai Hsueh
- Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan
| | - Pei-Wen Chu
- Institute of Neuroscience, National ChengChi University, Taipei City, Taiwan
| | - Shau-Kwaun Chen
- Institute of Neuroscience, National ChengChi University, Taipei City, Taiwan
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20
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Zhang M, Yang B, Peng S, Xiao J. Metformin Rescues the Impaired Osteogenesis Differentiation Ability of Rat Adipose-Derived Stem Cells in High Glucose by Activating Autophagy. Stem Cells Dev 2021; 30:1017-1027. [PMID: 34486387 DOI: 10.1089/scd.2021.0181] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The incidence and morbidity of diabetes osteoporosis (DOP) are increasing with each passing year. Patients with DOP have a higher risk of bone fracture and poor healing of bone defects, which make a poor quality of their life. Bone tissue engineering based on autologous adipose-derived stem cells (ASCs) transplantation develops as an effective technique to achieve tissue regeneration for patients with bone defects. With the purpose of promoting auto-ASCs transplantation, this research project explored the effect of metformin on the osteogenic differentiation of ASCs under a high-glucose culture environment. In this study, we found that 40 mM high glucose inhibited the physiological function of ASCs, including cell proliferation, migration, and osteogenic differentiation. Indicators of osteogenic differentiation were all downregulated by 40 mM high glucose, including alkaline phosphatase activity, runt-related transcription factor 2, and osteopontin gene expression, and Wnt signaling pathway. At the same time, the cell autophagy makers BECLIN1 and microtubule-associated protein 1 light chain 3 (LC3 I/II) were decreased. While 0.1 mM metformin upregulated the expression of BECLIN1 and LC3 I/II gene and inhibited the expression of mammalian target of rapamycin (mTOR) and GSK3β, it contributed to reverse the osteogenesis inhibition of ASCs caused by high glucose. When 3-methyladenine was used to block the activity of metformin, metformin could not exert its protective effect on ASCs. All the findings elaborated the regulatory mechanism of metformin in the high-glucose microenvironment to protect the osteogenic differentiation ability of ASCs. Metformin plays an active role in promoting the osteogenic differentiation of ASCs with DOP, and it may contribute to the application of ASCs transplantation for bone regeneration in DOP.
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Affiliation(s)
- Maorui Zhang
- Department of Oral Implantology, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China.,Oral & Maxillofacial Reconstruction and Regeneration Laboratory, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China.,Division of Oral Health Sciences, Department of Fixed Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Bo Yang
- Department of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, People's Republic of China
| | - Shuanglin Peng
- Department of Oral Implantology, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China.,Oral & Maxillofacial Reconstruction and Regeneration Laboratory, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China
| | - Jingang Xiao
- Department of Oral Implantology, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China.,Oral & Maxillofacial Reconstruction and Regeneration Laboratory, The Affiliated Stomatology Hospital of Southwest Medical University, Luzhou, People's Republic of China
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21
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The Role of Galectin-3 in 1α,25(OH) 2D 3-Regulated Osteoclast Formation from White Leghorn Chickens In Vitro. Vet Sci 2021; 8:vetsci8100234. [PMID: 34679063 PMCID: PMC8537632 DOI: 10.3390/vetsci8100234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/01/2021] [Accepted: 10/12/2021] [Indexed: 11/17/2022] Open
Abstract
Bones play an important role in maintaining the level of calcium in blood. They provide support for soft tissues and hematopoiesis and undergo continuous renewal throughout life. In addition, vitamin D is involved in regulating bone and calcium homeostasis. Galectin-3 (Gal-3) is a β-galactoside-binding protein that can regulate bone cell differentiation and function. Here, we aimed to study the regulatory effects of Gal-3 on vitamin-D-regulated osteoclastogenesis and bone resorption in chicken. Gal-3 expression in bone marrow stromal cells (BMSCs) from 18-day-old chicken embryos was inhibited or overexpressed. BMSCs were then co-cultured with bone marrow monocytes/macrophages (BMMs) with or without addition of 1α,25(OH)2D3. The results showed that 1α,25(OH)2D3 upregulated the expression of Gal-3 mRNA and receptor activator of nuclear-factor κB ligand (RANKL) expression in BMSCs and promoted osteoclastogenesis, as shown by the upregulated expression of osteoclast (OC) markers (CtsK, CAII, MMP-9, and TRAP) and increased bone resorption, a method for measuring the bone resorption area in vitro. Knockdown of Gal-3 by small-interfering RNA (siRNA) in BMSCs downregulated the expression of RANKL mRNA and attenuated the effects of 1α,25(OH)2D3 on osteoclastogenesis and bone resorption. Conversely, overexpression of Gal-3 in BMSCs enhanced the effects of osteoclastogenesis and bone resorption by increasing the expression of RANKL mRNA. These results demonstrated that Gal-3 mediates the differentiation and bone resorption of osteoclasts regulated by 1α,25(OH)2D3.
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22
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Tong X, Min W, Li S, Chen M, Song R, Bian J, Gu J, Liu Z. Beclin 1 positively regulates osteoprotegerin-induced inhibition of osteoclastogenesis by increasing autophagy in vitro. Differentiation 2021; 121:35-43. [PMID: 34454349 DOI: 10.1016/j.diff.2021.08.003] [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: 08/18/2021] [Accepted: 08/20/2021] [Indexed: 12/28/2022]
Abstract
Osteoclastogenesis is induced by receptor activator of nuclear factor-κB ligand (RANKL) and macrophage colony-stimulating factor (M-CSF), and can be suppressed by osteoprotegerin (OPG). Beclin1 has a dual role in osteoclastogenesis. However, the role of Beclin1-mediated autophagy during OPG-induced inhibition of osteoclastogenesis remains unclear. Here, we found that Beclin1 and matrix metalloproteinase 9 (MMP-9) expression were increased during osteoclastogenesis. OPG (20, 40, and 80 ng/mL) decreased Src and MMP-9 expression, but augmented Beclin1 expression and fluorescence intensity. Similarly, treatment with the autophagy activator rapamycin increased Beclin1 expression during OPG-induced inhibition of osteoclastogenesis. Further, Beclin1 knockdown restored osteoclast numbers by reducing autophagy during OPG-induced inhibition of osteoclastogenesis. These results indicate that Beclin1 has a positive role during OPG-induced inhibition of osteoclastogenesis by regulating autophagy, which might provide a potential basis for osteoclastogenesis.
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Affiliation(s)
- Xishuai Tong
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China; Center of Excellence for Vector-Borne Diseases, Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, 66502, Kansas, USA
| | - Wenyan Min
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Saihui Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Miaomiao Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Jianchun Bian
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China
| | - Jianhong Gu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Zongping Liu
- Institutes of Agricultural Science and Technology Development, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China.
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23
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Deng C, Zhang Q, He P, Zhou B, He K, Sun X, Lei G, Gong T, Zhang Z. Targeted apoptosis of macrophages and osteoclasts in arthritic joints is effective against advanced inflammatory arthritis. Nat Commun 2021; 12:2174. [PMID: 33846342 PMCID: PMC8042091 DOI: 10.1038/s41467-021-22454-z] [Citation(s) in RCA: 103] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 03/05/2021] [Indexed: 02/06/2023] Open
Abstract
Insufficient apoptosis of inflammatory macrophages and osteoclasts (OCs) in rheumatoid arthritis (RA) joints contributes toward the persistent progression of joint inflammation and destruction. Here, we deliver celastrol (CEL) to selectively induce apoptosis of OCs and macrophages in arthritic joints, with enzyme-responsive nanoparticles (termed PRNPs) composed of RGD modified nanoparticles (termed RNPs) covered with cleavable PEG chains. CEL-loaded PRNPs (CEL-PRNPs) dually target OCs and inflammatory macrophages derived from patients with RA via an RGD-αvβ3 integrin interaction after PEG cleavage by matrix metalloprotease 9, leading to increased apoptosis of these cells. In an adjuvant-induced arthritis rat model, PRNPs have an arthritic joint-specific distribution and CEL-PRNPs efficiently reduce the number of OCs and inflammatory macrophages within these joints. Additionally, rats with advanced arthritis go into inflammatory remission with bone erosion repair and negligible side effects after CEL-PRNPs treatment. These findings indicate potential for targeting chemotherapy-induced apoptosis in the treatment of advanced inflammatory arthritis.
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Affiliation(s)
- Caifeng Deng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, China
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Quan Zhang
- Institute of Materia Medica, School of Pharmacy, Chengdu Medical College, Chengdu, 610500, China
- Development and Regeneration Key Lab of Sichuan Province, Department of Pathology, Department of Anatomy and Histology and Embryology, Chengdu Medical College, Chengdu, 610500, China
| | - Penghui He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, China
| | - Bin Zhou
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, China
| | - Ke He
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, China
| | - Xun Sun
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, China
| | - Guanghua Lei
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, China.
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, China.
- National Clinical Research Center of Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China.
| | - Tao Gong
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, China.
| | - Zhirong Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610064, China
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24
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Guo YF, Su T, Yang M, Li CJ, Guo Q, Xiao Y, Huang Y, Liu Y, Luo XH. The role of autophagy in bone homeostasis. J Cell Physiol 2021; 236:4152-4173. [PMID: 33452680 DOI: 10.1002/jcp.30111] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/24/2020] [Accepted: 10/05/2020] [Indexed: 12/15/2022]
Abstract
Autophagy is an evolutionarily conserved intracellular process and is considered one of the main catabolism pathways. In the process of autophagy, cells are digested nonselectively or selectively to recover nutrients and energy, so it is regarded as an antiaging process. In addition to the essential role of autophagy in cellular homeostasis, autophagy is a stress response mechanism for cell survival. Here, we review recent literature describing the pathway of autophagy and its role in different bone cell types, including osteoblasts, osteoclasts, and osteocytes. Also discussed is the mechanism of autophagy in bone diseases associated with bone homeostasis, including osteoporosis and Paget's disease. Finally, we discuss the application of autophagy regulators in bone diseases. This review aims to introduce autophagy, summarize the understanding of its relevance in bone physiology, and discuss its role and therapeutic potential in the pathogenesis of bone diseases such as osteoporosis.
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Affiliation(s)
- Yi-Fan Guo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Tian Su
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Mi Yang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Qi Guo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Ye Xiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Yan Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Ya Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Xiang-Hang Luo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital of Central South University, Changsha, Hunan, China
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25
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Wang J, Li J, Song D, Ni J, Ding M, Huang J, Yan M. AMPK: implications in osteoarthritis and therapeutic targets. Am J Transl Res 2020; 12:7670-7681. [PMID: 33437352 PMCID: PMC7791500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 10/24/2020] [Indexed: 06/12/2023]
Abstract
Osteoarthritis (OA) is the most common skeletal disease and the leading cause of pain and disability in the aged population (>65 years). However, the underlying factors involved in OA pathogenesis remain elusive which has resulted in failure to identify disease-modifying OA drugs. Altered metabolism has been shown to be a prominent pathological change in OA. As a critical bioenergy sensor, AMP-activated protein kinase (AMPK) mediates not only energy homeostasis but also redox balance in chondrocytes to counter various cell stress. Dysfunction of AMPK activity has been associated with reduced autophagy, impaired mitochondrial function, excessive reactive oxygen species generation, and inflammation in joint tissue. These abnormalities ultimately trigger articular cartilage degeneration, synovial inflammation, and abnormal subchondral bone remodeling. This review focuses on recent findings describing the central role of AMPK in joint homeostasis and OA development. We also highlight current advances that target AMPK as a novel therapeutic strategy for OA prevention.
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Affiliation(s)
- Junjie Wang
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
| | - Jiali Li
- Department of Rheumatology and Nephrology, University of South China Affiliated Changsha Central HospitalChangsha 410008, Hunan, China
| | - Deye Song
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
| | - Jiangdong Ni
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
| | - Muliang Ding
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
| | - Jun Huang
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
| | - Mingming Yan
- Department of Orthopaedic Surgery, The Second Xiangya Hospital of Central South UniversityChangsha 410011, Hunan, China
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26
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PERK controls bone homeostasis through the regulation of osteoclast differentiation and function. Cell Death Dis 2020; 11:847. [PMID: 33051453 PMCID: PMC7554039 DOI: 10.1038/s41419-020-03046-z] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 09/20/2020] [Accepted: 09/22/2020] [Indexed: 12/17/2022]
Abstract
Osteoclasts are multinucleated giant cells with the ability to degrade bone tissue, and are closely related to abnormal bone metabolic diseases. Endoplasmic reticulum (ER) is an organelle responsible for protein modification, quality control, and transportation. The accumulation of unfolded or misfolded proteins in ER cavity induces ER stress. Double-stranded RNA-dependent protein kinase-like ER kinase (PERK) is an ER stress-sensing protein, which is ubiquitous in eukaryotic cells. Systemic PERK knockout mice show severe bone loss, suggesting that PERK is of great significance for maintaining the normal growth and development of bone tissue, but the role of PERK in osteoclastogenesis is still unclear. In this study, we found that PERK was significantly activated during RANKL-induced osteoclast differentiation; knockdown of PERK by siRNA and inhibition of PERK by GSK2606414, respectively, had significant negative regulatory effects on the formation and bone resorption of osteoclasts. PERK inhibitor GSK2606414 down-regulated the mRNA levels and protein expression of osteoclast differentiation marker genes, and inhibited RANKL-induced activation of Mitogen-activated protein kinase (MAPK) and nuclear factor κB (NF-κB) pathways. Treatment with PERK inhibitor GSK2606414 in ovariectomized mouse model significantly suppressed bone loss and osteoclast formation. Thapsigargin activated ER stress to enhance autophagy, while GSK2606414 had a significant inhibitory effect on autophagy flux and autophagosome formation. Antioxidant N-acetylcysteine (NAC) could inhibit the expression of PERK phosphorylation, osteoclast-related proteins and autophagy-related proteins, but the use of PERK activator CCT020312 can reverse inhibition effect of NAC. Our findings demonstrate a key role for PERK in osteoclast differentiation and suggest its therapeutic potential.
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27
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Aung M, Amin S, Gulraiz A, Gandhi FR, Pena Escobar JA, Malik BH. The Future of Metformin in the Prevention of Diabetes-Related Osteoporosis. Cureus 2020; 12:e10412. [PMID: 33062529 PMCID: PMC7550241 DOI: 10.7759/cureus.10412] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
As a worldwide aging population is on the rise, osteoporosis (OS) is becoming a global health burden. Therefore, many researchers and health authorities are looking into the potential prevention and treatment of OS. Although previously regarded as two separate pathological processes, diabetes (DM) and OS are now regarded as two conditions that can occur together. It is now believed that OS can develop as a complication of DM. This relationship is further evidenced through a reduction in bone mineral density in type-1 diabetes with a resulting increased risk of fracture. Although bone mineral density in type-2 diabetes mellitus is normal or increased, there is also increased fragility due to decreased bone quality. These abnormal bone qualities tend to occur through the production of reduced bone microvasculature and advanced glycation end product, AGE. Interestingly, one of the most common treatments for DM, metformin (MF), shows a promising result on the protection of diabetes and non-diabetes related bone turnover. It is believed that MF modulates its effect through the adenosine monophosphate-activated protein kinase (AMPK) pathway. Recent data regarded AMPK as a vital mediator of homeostasis. It is involved not only in glucose metabolism but also in osteogenesis. AMPK can directly influence the production of mature and good quality bone by decreasing osteoclasts, increasing osteoblast formation, and enhancing bone mineral deposition. As an activator of AMPK, MF also upregulates osteogenesis. Furthermore, MF can influence osteogenesis through a non-AMPK pathway, such as the fructose 1-6 phosphatase pathway, by reducing glucose levels. While already recognized as a safe and effective treatment for DM, this article discusses whether MF can be used for the prevention and treatment of OS.
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Affiliation(s)
- Myat Aung
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA.,Emergency Department, Poole Hospital, Poole, GBR
| | - Saba Amin
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Azouba Gulraiz
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Fenil R Gandhi
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Julio A Pena Escobar
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Bilal Haider Malik
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
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28
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Li X, Xu J, Dai B, Wang X, Guo Q, Qin L. Targeting autophagy in osteoporosis: From pathophysiology to potential therapy. Ageing Res Rev 2020; 62:101098. [PMID: 32535273 DOI: 10.1016/j.arr.2020.101098] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/26/2020] [Accepted: 06/03/2020] [Indexed: 12/19/2022]
Abstract
Osteoporosis is a highly prevalent disorder characterized by the loss of bone mass and microarchitecture deterioration of bone tissue, attributed to various factors, including menopause (primary), aging (primary) and adverse effects of relevant medications (secondary). In recent decades, knowledge regarding the etiological mechanisms underpinning osteoporosis emphasizes that bone cellular homeostasis, including the maintenance of cell functions, differentiation, and the response to stress, is tightly regulated by autophagy, which is a cell survival mechanism for eliminating and recycling damaged proteins and organelles. With the important roles in the maintenance of cellular homeostasis and organ function, autophagy has emerged as a potential target for the prevention and treatment of osteoporosis. In this review, we update and discuss the pathophysiology of autophagy in normal bone cell life cycle and metabolism. Then, the alternations of autophagy in primary and secondary osteoporosis, and the accompanied pathological process are discussed. Finally, we discuss current strategies, limitations, and challenges involved in targeting relevant pathways and propose strategies by which such hurdles may be circumvented in the future for their translation into clinical validations and applications for the prevention and treatment of osteoporosis.
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29
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Chen XD, Tan JL, Feng Y, Huang LJ, Zhang M, Cheng B. Autophagy in fate determination of mesenchymal stem cells and bone remodeling. World J Stem Cells 2020; 12:776-786. [PMID: 32952858 PMCID: PMC7477662 DOI: 10.4252/wjsc.v12.i8.776] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/17/2020] [Accepted: 06/20/2020] [Indexed: 02/06/2023] Open
Abstract
Mesenchymal stem cells (MSCs) have been widely exploited as promising candidates in clinical settings for bone repair and regeneration in view of their self-renewal capacity and multipotentiality. However, little is known about the mechanisms underlying their fate determination, which would illustrate their effectiveness in regenerative medicine. Recent evidence has shed light on a fundamental biological role of autophagy in the maintenance of the regenerative capability of MSCs and bone homeostasis. Autophagy has been implicated in provoking an immediately available cytoprotective mechanism in MSCs against stress, while dysfunction of autophagy impairs the function of MSCs, leading to imbalances of bone remodeling and a wide range of aging and degenerative bone diseases. This review aims to summarize the up-to-date knowledge about the effects of autophagy on MSC fate determination and its role as a stress adaptation response. Meanwhile, we highlight autophagy as a dynamic process and a double-edged sword to account for some discrepancies in the current research. We also discuss the contribution of autophagy to the regulation of bone cells and bone remodeling and emphasize its potential involvement in bone disease.
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Affiliation(s)
- Xiao-Dan Chen
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Jia-Li Tan
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Yi Feng
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Li-Jia Huang
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Mei Zhang
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Bin Cheng
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
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30
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Wang S, Deng Z, Ma Y, Jin J, Qi F, Li S, Liu C, Lyu FJ, Zheng Q. The Role of Autophagy and Mitophagy in Bone Metabolic Disorders. Int J Biol Sci 2020; 16:2675-2691. [PMID: 32792864 PMCID: PMC7415419 DOI: 10.7150/ijbs.46627] [Citation(s) in RCA: 119] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/12/2020] [Indexed: 12/15/2022] Open
Abstract
Bone metabolic disorders include osteolysis, osteoporosis, osteoarthritis and rheumatoid arthritis. Osteoblasts and osteoclasts are two major types of cells in bone constituting homeostasis. The imbalance between bone formation by osteoblasts and bone resorption by osteoclasts has been shown to have a direct contribution to the onset of these diseases. Recent evidence indicates that autophagy and mitophagy, the selective autophagy of mitochondria, may play a vital role in regulating the proliferation, differentiation and function of osteoblasts and osteoclasts. Several signaling pathways, including PINK1/Parkin, SIRT1, MAPK8/FOXO3, Beclin-1/BECN1, p62/SQSTM1, and mTOR pathways, have been implied in the regulation of autophagy and mitophagy in these cells. Here we review the current progress about the regulation of autophagy and mitophagy in osteoblasts and osteoclasts in these bone metabolic disorders, as well as the molecular signaling activated or deactivated during this process. Together, we hope to draw attention to the role of autophagy and mitophagy in bone metabolic disorders, and their potential as a new target for the treatment of bone metabolic diseases and the requirements of further mechanism studies.
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Affiliation(s)
- Shuai Wang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China.,South China University of Technology-The University of Western Australia Joint Center for Regenerative Medicine Research, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Zhantao Deng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China
| | - Yuanchen Ma
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China
| | - Jiewen Jin
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University
| | - Fangjie Qi
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China.,South China University of Technology-The University of Western Australia Joint Center for Regenerative Medicine Research, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Shuxian Li
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China.,South China University of Technology-The University of Western Australia Joint Center for Regenerative Medicine Research, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Chang Liu
- South China University of Technology-The University of Western Australia Joint Center for Regenerative Medicine Research, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Feng-Juan Lyu
- South China University of Technology-The University of Western Australia Joint Center for Regenerative Medicine Research, School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Qiujian Zheng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 510080, China
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31
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Tong X, Gu J, Chen M, Wang T, Zou H, Song R, Zhao H, Bian J, Liu Z. p53 positively regulates osteoprotegerin-mediated inhibition of osteoclastogenesis by downregulating TSC2-induced autophagy in vitro. Differentiation 2020; 114:58-66. [PMID: 32771207 DOI: 10.1016/j.diff.2020.06.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 06/10/2020] [Accepted: 06/18/2020] [Indexed: 12/14/2022]
Abstract
Osteoclasts are terminally multinucleated cells that are regulated by nuclear factor-activated T cells c1 (NFATc1), and are responsible for bone resorption while the tartrate resistant acid phosphatase (TRAP) enzymes releases into bone resorption lacunae. Furthermore, tumor suppressor p53 is a negative regulator during osteoclastogenesis. Osteoprotegerin (OPG) inhibits osteoclastogenesis and bone resorption by activating autophagy, however, whether p53 is involved in OPG-mediated inhibition of osteoclastogenesis remains unclear. In the current study, OPG could enhance the expression of p53 and tuberin sclerosis complex 2 (TSC2). Moreover, the expression of p53 is regulated by autophagy during OPG-mediated inhibition of osteoclastogenesis. Inhibition of p53 by treated with pifithrin-α (PFTα) causing augments of osteoclastogenesis and bone resorption, also reversed OPG-mediated inhibition of osteoclastogenesis by reducing the expression of TSC2. In addition, knockdown of TSC2 using siRNA could rescue OPG-mediated inhibition of osteoclastogenesis by reducing autophagy, which is manifested by the decrease of the expression of Beclin1 and the phosphorylation of mammalian target of rapamycin (mTOR) and ribosomal protein S6 kinase beta 1 (S6K1, also known as p70S6K). Collectively, p53 plays a critical role during OPG-mediated inhibition of osteoclastogenesis via regulating the TSC2-induced autophagy in vitro.
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Affiliation(s)
- Xishuai Tong
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Center of Excellence for Vector-Borne Diseases, Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, 66502, Kansas, USA; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Jianhong Gu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Miaomiao Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Tao Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China
| | - Hui Zou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Hongyan Zhao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Jianchun Bian
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China
| | - Zongping Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, PR China; Jiangsu Key Laboratory of Zoonosis, Yangzhou, 225009, Jiangsu, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China.
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Tong X, Zhang C, Wang D, Song R, Ma Y, Cao Y, Zhao H, Bian J, Gu J, Liu Z. Suppression of AMP-activated protein kinase reverses osteoprotegerin-induced inhibition of osteoclast differentiation by reducing autophagy. Cell Prolif 2019; 53:e12714. [PMID: 31696568 PMCID: PMC6985670 DOI: 10.1111/cpr.12714] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 09/25/2019] [Accepted: 10/07/2019] [Indexed: 12/11/2022] Open
Abstract
Objectives Osteoclasts (OC) are unique terminally differentiated cells whose primary function is bone resorption. We previously showed that osteoprotegerin (OPG) inhibits OC differentiation in vitro by enhancing autophagy via the adenosine monophosphate‐activated protein kinase (AMPK)/mTOR/p70S6K signalling pathway in vitro. Here, we aimed to elucidate the mechanism of AMPK mediated autophagy to regulate OPG‐mediated inhibition of OC differentiation and identify potential therapeutic targets associated with bone loss. Materials and Methods We used the AMPK activator AICAR to determine the relationship between AMPK activation and OC differentiation, and studied the role of AMPK‐mediated autophagy in OPG‐mediated inhibition of OC differentiation by using autophagy inhibitors or AMPK knockdown. Results AMP‐activated protein kinase activation caused LC3II accumulation and weakened OC differentiation activity. In contrast, inactivation of autophagy by 3‐methyladenine or Bafilomycin A1 could attenuate OPG‐mediated inhibition of OC differentiation via the AMPK/mTOR/p70S6K signalling pathway. Furthermore, the AMPK inhibitor compound C and knockdown of AMPK impaired OPG‐mediated inhibition of OC differentiation by inducing autophagy. Conclusions These results demonstrated that the AMPK signalling pathway functions as a critical regulator in the OPG‐mediated inhibition of OC differentiation, by inducing autophagy. Our results provide a basis for future bone‐related studies on the AMPK signalling pathway.
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Affiliation(s)
- Xishuai Tong
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Chuang Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China
| | - Dong Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Key Laboratory of Neurodegeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neurodegeneration, Nantong University, Nantong, Jiangsu, China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Yonggang Ma
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Ying Cao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Hongyan Zhao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Jianchun Bian
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Jianhong Gu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
| | - Zongping Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.,Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China
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