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Seal A, Hughes M, Wei F, Pugazhendhi AS, Ngo C, Ruiz J, Schwartzman JD, Coathup MJ. Sphingolipid-Induced Bone Regulation and Its Emerging Role in Dysfunction Due to Disease and Infection. Int J Mol Sci 2024; 25:3024. [PMID: 38474268 DOI: 10.3390/ijms25053024] [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: 02/09/2024] [Revised: 03/02/2024] [Accepted: 03/04/2024] [Indexed: 03/14/2024] Open
Abstract
The human skeleton is a metabolically active system that is constantly regenerating via the tightly regulated and highly coordinated processes of bone resorption and formation. Emerging evidence reveals fascinating new insights into the role of sphingolipids, including sphingomyelin, sphingosine, ceramide, and sphingosine-1-phosphate, in bone homeostasis. Sphingolipids are a major class of highly bioactive lipids able to activate distinct protein targets including, lipases, phosphatases, and kinases, thereby conferring distinct cellular functions beyond energy metabolism. Lipids are known to contribute to the progression of chronic inflammation, and notably, an increase in bone marrow adiposity parallel to elevated bone loss is observed in most pathological bone conditions, including aging, rheumatoid arthritis, osteoarthritis, and osteomyelitis. Of the numerous classes of lipids that form, sphingolipids are considered among the most deleterious. This review highlights the important primary role of sphingolipids in bone homeostasis and how dysregulation of these bioactive metabolites appears central to many chronic bone-related diseases. Further, their contribution to the invasion, virulence, and colonization of both viral and bacterial host cell infections is also discussed. Many unmet clinical needs remain, and data to date suggest the future use of sphingolipid-targeted therapy to regulate bone dysfunction due to a variety of diseases or infection are highly promising. However, deciphering the biochemical and molecular mechanisms of this diverse and extremely complex sphingolipidome, both in terms of bone health and disease, is considered the next frontier in the field.
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Affiliation(s)
- Anouska Seal
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA
| | - Megan Hughes
- School of Biosciences, Cardiff University, Cardiff CF10 3AT, UK
| | - Fei Wei
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | - Abinaya S Pugazhendhi
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | - Christopher Ngo
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | - Jonathan Ruiz
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | | | - Melanie J Coathup
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA
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Yavuz MC, Guler R, Ozcan EC, Bozoglan A, Kirtay M, Kaya CA, Dundar S. The Investigation of Bone-Implant Connection and New Bone Formation in Fasting and High-Fatty Diet Rats. Niger J Clin Pract 2024; 27:95-101. [PMID: 38317041 DOI: 10.4103/njcp.njcp_530_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 12/18/2023] [Indexed: 02/07/2024]
Abstract
BACKGROUND Hyperlipidemia caused by a high-fat diet (HFD) has many adverse effects on the cardiovascular system, including vascular problems. In addition, a HFD also has significant adverse effects on bone health. AIM The aim of this study is to examine bone-implant osteointegration and new bone formation in peri-implant defects in fasting and high-fatty diet applied rats. MATERIALS AND METHODS In this study, 28 female Sprague Dawley rats were used. The rats were divided into four groups, with seven rats in each group: the control group on a normal diet (Group 1) (n = 7), the fasted group (Group 2) (n = 7), the high-fatty diet (HFD) group (Group 3) (n = 7), and the fasted and HFD group (Group 4) (n = 7). Titanium implants with a diameter of 2.5 mm and a length of 4 mm were placed in the right tibia bones of the subjects, and a bone graft corresponding to 2 mm of the implant length was placed in the bone defect applied to the neck region. All rats that continued the administered diet for 12 weeks were sacrificed at the end of the experiment period. The implants and surrounding bone tissue were surgically removed and subjected to biomechanical analysis to assess bone-implant osteointegration and peri-implant new bone formation. RESULTS It was determined that there was no statistically significant difference between the rats in the control group and the other three groups in terms of bone-implant osteointegration and peri-implant new bone formation (P > 0.05). CONCLUSION As a result of this study, it was determined that fasting or maintaining a HFD does not adversely affect bone-implant osteointegration or peri-implant new bone formation in the tibias of rats.
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Affiliation(s)
- M C Yavuz
- Department of Periodontology, Faculty of Dentistry, Medeniyet University, Istanbul, Turkey
| | - R Guler
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - E C Ozcan
- Department of Esthetic, Plastic and Reconstructive Surgery, Faculty of Medicine, Firat University, Elazig, Turkey
| | - A Bozoglan
- Department of Periodontology, Faculty of Dentistry, Firat University, Elazig, Turkey
| | - M Kirtay
- Private Practice, Oral and Maxillofacial Surgery, London, Ontario, Canada
| | - C A Kaya
- Department of Vegetable and Animal Production/Milk and Fattening, Faculty of Diyarbakir Agricultural Vocational School, Dicle University, Diyarbakir, Turkey
| | - S Dundar
- Department of Periodontology, Faculty of Dentistry, Firat University, Elazig, Turkey
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De Angelis P, Rella E, Manicone PF, Gasparini G, Giovannini V, Liguori MG, Camodeca F, De Rosa G, Cavalcanti C, D'Addona A. The Effect of Hyperlipidemia on Peri-implant Health: A Clinical and Radiographical Prospective Study. BIOMED RESEARCH INTERNATIONAL 2023; 2023:7570587. [PMID: 37284029 PMCID: PMC10241576 DOI: 10.1155/2023/7570587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 07/13/2022] [Indexed: 06/08/2023]
Abstract
High levels of cholesterol and triglycerides may have a negative effect on the immune system and bone health, leading to lower bone mineral density, an increased risk of osteoporosis, and bone fractures, and could therefore also be related to a significant worsening of peri-implant health. The purpose of the following study was to evaluate whether the altered lipid profile in patients who undergo implant insertion surgery represents a prognostic factor capable of influencing clinical outcomes. This prospective observational study was conducted on 93 subjects; patients were required to have taken blood tests to obtain triglycerides (TG), total cholesterol, low-density lipoprotein (LDL), and high-density lipoprotein (HDL) levels prior to the surgical procedure to classify them according to current American Heart Association guidelines. The outcomes considered were marginal bone loss (MBL) 3 years after implant placement, full-mouth plaque score (FMPS), and full-mouth bleeding score (FMBS) 3 years after surgery. A statistically significant correlation was found between hypertriglyceridemia and MBL as well as between total cholesterol and MBL. There is no statistically significant correlation between the variables analyzed and the secondary outcomes 3 years after implant placement. Peri-implant marginal bone loss may be influenced by hyperlipidemia. However, further studies are needed, with larger samples and more extensive follow-ups, to confirm these results.
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Affiliation(s)
- Paolo De Angelis
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Edoardo Rella
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Paolo Francesco Manicone
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Giulio Gasparini
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Valerio Giovannini
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Margherita Giorgia Liguori
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesca Camodeca
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Giuseppe De Rosa
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Camilla Cavalcanti
- Department of Head and Neck and Sensory Organs, Division of Oral Surgery and Implantology, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
| | - Antonio D'Addona
- Department of Head and Neck and Sensory Organs, Division of Oral and Maxillofacial Surgery, Fondazione Policlinico Universitario A. Gemelli IRCCS–Università Cattolica del Sacro Cuore, Rome, Italy
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Cavati G, Pirrotta F, Merlotti D, Ceccarelli E, Calabrese M, Gennari L, Mingiano C. Role of Advanced Glycation End-Products and Oxidative Stress in Type-2-Diabetes-Induced Bone Fragility and Implications on Fracture Risk Stratification. Antioxidants (Basel) 2023; 12:antiox12040928. [PMID: 37107303 PMCID: PMC10135862 DOI: 10.3390/antiox12040928] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/06/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Type 2 diabetes (T2D) and osteoporosis (OP) are major causes of morbidity and mortality that have arelevant health and economic burden. Recent epidemiological evidence suggests that both of these disorders are often associated with each other and that T2D patients have an increased risk of fracture, making bone an additional target of diabetes. As occurs for other diabetic complications, the increased accumulation of advanced glycation end-products (AGEs) and oxidative stress represent the major mechanisms explaining bone fragility in T2D. Both of these conditions directly and indirectly (through the promotion of microvascular complications) impair the structural ductility of bone and negatively affect bone turnover, leading to impaired bone quality, rather than decreased bone density. This makes diabetes-induced bone fragility remarkably different from other forms of OP and represents a major challenge for fracture risk stratification, since either the measurement of BMD or the use of common diagnostic algorithms for OP have a poor predictive value. We review and discuss the role of AGEs and oxidative stress on the pathophysiology of bone fragility in T2D, providing some indications on how to improve fracture risk prediction in T2D patients.
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Affiliation(s)
- Guido Cavati
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Filippo Pirrotta
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Daniela Merlotti
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Elena Ceccarelli
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Marco Calabrese
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Luigi Gennari
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
| | - Christian Mingiano
- Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
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Palmieri M, Joseph TE, O’Brien CA, Gomez-Acevedo H, Manolagas SC, Ambrogini E. Deletion of the scavenger receptor Scarb1 in osteoblast progenitors does not affect bone mass. PLoS One 2022; 17:e0265893. [PMID: 35349600 PMCID: PMC8963559 DOI: 10.1371/journal.pone.0265893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 03/09/2022] [Indexed: 11/18/2022] Open
Abstract
The scavenger receptor class B member 1 (SR-B1 or Scarb1) is a cell surface receptor for high density lipoproteins. It also binds oxidized low density lipoproteins and phosphocholine-containing oxidized phospholipids (PC-OxPL), which adversely affect bone homeostasis. Overexpression of a single chain form of the antigen-binding domain of E06 IgM-a natural antibody that recognizes PC-OxPL-increases trabecular and cortical bone mass in female and male mice by stimulating bone formation. We have previously reported that Scarb1 is the most abundant scavenger receptor for PC-OxPL in calvaria-derived osteoblastic cells. Additionally, bone marrow- and calvaria-derived osteoblasts from Scarb1 knockout mice (Scarb1 KO) are protected from the pro-apoptotic and anti-differentiating effects of OxPL. Previous skeletal analysis of Scarb1 KO mice has produced contradictory results, with some studies reporting elevated bone mass but another study reporting low bone mass. To clarify the role of Scarb1 in osteoblasts, we deleted Scarb1 specifically in cells of the osteoblast lineage using Osx1-Cre transgenic mice. We observed no difference in bone mineral density measured by DXA in either female or male Osx1-Cre;Scarb1fl/fl mice compared to wild type (WT), Osx1-Cre, or Scarb1fl/fl littermate controls. Additionally, microCT analysis of 6-month-old females and 7-month-old males did not detect any difference in trabecular or cortical bone mass between genotypes. These results indicate that expression of Scarb1 in cells of the osteoblast lineage does not play an important role in bone homeostasis and, therefore, it is not essential for the effects of PC-OxPL on these cells.
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Affiliation(s)
- Michela Palmieri
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, United States of America
| | - Teenamol E. Joseph
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, United States of America
| | - Charles A. O’Brien
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, United States of America
| | - Horacio Gomez-Acevedo
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America
| | - Stavros C. Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, United States of America
| | - Elena Ambrogini
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, United States of America
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Mo L, Ma C, Wang Z, Li J, He W, Niu W, Chen Z, Zhou C, Liu Y. Integrated Bioinformatic Analysis of the Shared Molecular Mechanisms Between Osteoporosis and Atherosclerosis. Front Endocrinol (Lausanne) 2022; 13:950030. [PMID: 35937806 PMCID: PMC9353191 DOI: 10.3389/fendo.2022.950030] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Accepted: 06/22/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Osteoporosis and atherosclerosis are common in the elderly population, conferring a heavy worldwide burden. Evidence links osteoporosis and atherosclerosis but the exact underlying common mechanism of its occurrence is unclear. The purpose of this study is to further explore the molecular mechanism between osteoporosis and atherosclerosis through integrated bioinformatic analysis. METHODS The microarray data of osteoporosis and atherosclerosis in the Gene Expression Omnibus (GEO) database were downloaded. The Weighted Gene Co-Expression Network Analysis (WGCNA) and differentially expressed genes (DEGs) analysis were used to identify the co-expression genes related to osteoporosis and atherosclerosis. In addition, the common gene targets of osteoporosis and atherosclerosis were analyzed and screened through three public databases (CTD, DISEASES, and GeneCards). Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were performed by Metascape. Then, the common microRNAs (miRNAs) in osteoporosis and atherosclerosis were screened out from the Human microRNA Disease Database (HMDD) and the target genes of whom were predicted through the miRTarbase. Finally, the common miRNAs-genes network was constructed by Cytoscape software. RESULTS The results of common genes analysis showed that immune and inflammatory response may be a common feature in the pathophysiology of osteoporosis and atherosclerosis. Six hub genes (namely, COL1A1, IBSP, CTSD, RAC2, MAF, and THBS1) were obtained via taking interaction of different analysis results. The miRNAs-genes network showed that has-let-7g might play an important role in the common mechanisms between osteoporosis and atherosclerosis. CONCLUSION This study provides new sights into shared molecular mechanisms between osteoporosis and atherosclerosis. These common pathways and hub genes may offer promising clues for further experimental studies.
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Affiliation(s)
- Liang Mo
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Chao Ma
- The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhangzheng Wang
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jianxiong Li
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Wei He
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
- Guangdong Research Institute for Orthopedics and Traumatology of Chinese Medicine, Guangzhou, China
| | - Wei Niu
- The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhengqiu Chen
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
- *Correspondence: Yuhao Liu, ; Chi Zhou, ; Zhengqiu Chen,
| | - Chi Zhou
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
- *Correspondence: Yuhao Liu, ; Chi Zhou, ; Zhengqiu Chen,
| | - Yuhao Liu
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
- *Correspondence: Yuhao Liu, ; Chi Zhou, ; Zhengqiu Chen,
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Wang XY, Ma TL, Chen KN, Pang ZY, Wang H, Huang JM, Qi GB, Wang CZ, Jiang ZX, Gong LJ, Wang Z, Jiang C, Yan ZQ. Accumulation of LDL/ox-LDL in the necrotic region participates in osteonecrosis of the femoral head: a pathological and in vitro study. Lipids Health Dis 2021; 20:167. [PMID: 34823555 PMCID: PMC8620162 DOI: 10.1186/s12944-021-01601-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 11/16/2021] [Indexed: 02/08/2023] Open
Abstract
Background Osteonecrosis of the femoral head (ONFH) is a common but intractable disease that appears to involve lipid metabolic disorders. Although numerous studies have demonstrated that high blood levels of low-density lipoprotein (LDL) are closely associated with ONFH, there is limited evidence to explain the pathological role of LDL. Pathological and in vitro studies were performed to investigate the role of disordered metabolism of LDL and oxidized LDL (ox-LDL) in the femoral head in the pathology of ONFH. Methods Nineteen femoral head specimens from patients with ONFH were obtained for immunohistochemistry analysis. Murine long-bone osteocyte Y4 cells were used to study the effects of LDL/ox-LDL on cell viability, apoptosis, and metabolism process of LDL/ox-LDL in osteocytes in normoxic and hypoxic environments. Results In the pathological specimens, marked accumulation of LDL/ox-LDL was observed in osteocytes/lacunae of necrotic regions compared with healthy regions. In vitro studies showed that ox-LDL, rather than LDL, reduced the viability and enhanced apoptosis of osteocytes. Pathological sections indicated that the accumulation of ox-LDL was significantly associated with impaired blood supply. Exposure to a hypoxic environment appeared to be a key factor leading to LDL/ox-LDL accumulation by enhancing internalisation and oxidation of LDL in osteocytes. Conclusions The accumulation of LDL/ox-LDL in the necrotic region may contribute to the pathology of ONFH. These findings could provide new insights into the prevention and treatment of ONFH. Supplementary Information The online version contains supplementary material available at 10.1186/s12944-021-01601-x.
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Affiliation(s)
- Xin-Yuan Wang
- Department of Orthopaedics, West China Hospital, West China Medical School, Sichuan University, Chengdu, 610041, Sichuan Province, China.,Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Tian-Le Ma
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Kang-Ning Chen
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Zhi-Ying Pang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Hao Wang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Jun-Ming Huang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Guo-Bin Qi
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Chen-Zhong Wang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Zeng-Xin Jiang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Lin-Jing Gong
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, China
| | - Zhe Wang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Chang Jiang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.
| | - Zuo-Qin Yan
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.
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Mohd Ramli ES, Sukalingam K, Kamaruzzaman MA, Soelaiman IN, Pang KL, Chin KY. Direct and Indirect Effect of Honey as a Functional Food Against Metabolic Syndrome and Its Skeletal Complications. Diabetes Metab Syndr Obes 2021; 14:241-256. [PMID: 33500644 PMCID: PMC7822078 DOI: 10.2147/dmso.s291828] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 12/22/2020] [Indexed: 12/13/2022] Open
Abstract
Metabolic syndrome (MetS) refers to the simultaneous presence of hypertension, hyperglycemia, dyslipidemia and/or visceral obesity, which predisposes a person to cardiovascular diseases and diabetes. Evidence suggesting the presence of direct and indirect associations between MetS and osteoporosis is growing. Many studies have reported the beneficial effects of polyphenols in alleviating MetS in in vivo and in vitro models through their antioxidant and anti-inflammation actions. This review aims to summarize the effects of honey (based on unifloral and multi-floral nectar sources) on bone metabolism and each component of MetS. A literature search was performed using the PubMed and Scopus databases using specific search strings. Original studies related to components of MetS and bone, and the effects of honey on components of MetS and bone were included. Honey polyphenols could act synergistically in alleviating MetS by preventing oxidative damage and inflammation. Honey intake is shown to reduce blood glucose levels and prevent excessive weight gain. It also improves lipid metabolism by reducing total cholesterol, triglycerides and low-density lipoprotein, as well as increasing high-density lipoprotein. Honey can prevent bone loss by reducing the adverse effects of MetS on bone homeostasis, apart from its direct action on the skeletal system. In conclusion, honey supplementation could be integrated into the management of MetS and MetS-induced bone loss as a preventive and adjunct therapeutic agent.
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Affiliation(s)
- Elvy Suhana Mohd Ramli
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Kumeshini Sukalingam
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Mohd Amir Kamaruzzaman
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Ima Nirwana Soelaiman
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Kok-Lun Pang
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Kok-Yong Chin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
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Palmieri M, Kim HN, Gomez-Acevedo H, Que X, Tsimikas S, Jilka RL, Manolagas SC, Witztum JL, Ambrogini E. A Neutralizing Antibody Targeting Oxidized Phospholipids Promotes Bone Anabolism in Chow-Fed Young Adult Mice. J Bone Miner Res 2021; 36:170-185. [PMID: 32990984 PMCID: PMC7855899 DOI: 10.1002/jbmr.4173] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 08/14/2020] [Accepted: 08/23/2020] [Indexed: 12/16/2022]
Abstract
Oxidized phospholipids containing phosphocholine (OxPL) are pro-inflammatory lipid peroxidation products that bind to scavenger receptors (SRs), such as Scarb1, and toll-like receptors (TLRs). Excessive OxPL, as found in oxidized low-density lipoprotein (OxLDL), overwhelm these defense mechanisms and become pathogenic in atherosclerosis, nonalcoholic steatohepatitis (NASH), and osteoporosis. We previously reported that the innate IgM natural antibody E06 binds to OxPL and neutralizes their deleterious effects; expression of the single-chain (scFv) form of the antigen-binding domain of E06 (E06-scFv) as a transgene increases trabecular bone in male mice. We show herein that E06-scFv increases trabecular and cortical bone in female and male mice by increasing bone formation and decreasing osteoblast apoptosis in vivo. Homozygous E06-scFv mice have higher bone mass than hemizygous, showing a dose effect of the transgene. To investigate how OxPL restrain bone formation under physiologic conditions, we measured the levels of SRs and TLRs that bind OxPL. We found that osteoblastic cells primarily express Scarb1. Moreover, OxLDL-induced apoptosis and reduced differentiation were prevented in bone marrow-derived or calvaria-derived osteoblasts from Scarb1 knockout mice. Because Scarb1-deficient mice are reported to have high bone mass, our results suggest that E06 may promote bone anabolism in healthy young mice, at least in part, by neutralizing OxPL, which in turn promote Scarb1-mediated apoptosis of osteoblasts or osteoblast precursors. © 2020 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR)..
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Affiliation(s)
- Michela Palmieri
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Ha-Neui Kim
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Horacio Gomez-Acevedo
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Xuchu Que
- Division of Endocrinology and Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Sotirios Tsimikas
- Division of Cardiology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Robert L Jilka
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Stavros C Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Joseph L Witztum
- Division of Endocrinology and Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Elena Ambrogini
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases and Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
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10
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Villalvilla A, Larrañaga-Vera A, Lamuedra A, Pérez-Baos S, López-Reyes AG, Herrero-Beaumont G, Largo R. Modulation of the Inflammatory Process by Hypercholesterolemia in Osteoarthritis. Front Med (Lausanne) 2020; 7:566250. [PMID: 33102504 PMCID: PMC7546767 DOI: 10.3389/fmed.2020.566250] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/28/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: Several studies have linked metabolic syndrome to the development of osteoarthritis (OA) through hypercholesterolemia, one of its components. However, epidemiological studies showed contradictory results, and it is not clear how hypercholesterolemia itself, or oxidized LDL (oxLDL)-a pathological molecule potentially involved in this relationship-could be affecting OA. The objectives of this study were to investigate the effect of hypercholesterolemia induced by high-fat diet (HFD) in cartilage from OA rabbits, and how oxLDL affect human chondrocyte inflammatory and catabolic responses. Design: New Zealand rabbits were fed with HFD for 18 weeks. On week 6, OA was surgically induced. At the end of the study, cartilage damage and IL-1β, IL-6, MCP-1, MMP-13, and COX-2 expression in articular cartilage were evaluated. In addition, cultured human OA articular chondrocytes were treated with oxLDL at concentrations equivalent to those expected in synovial fluid from HFD rabbits, in the presence of IL-1β and TNFα. The effect of oxLDL on cell viability, nitric oxide production and catabolic and pro-inflammatory gene expression was evaluated. Results: HFD intake did not modify cartilage structure or pro-inflammatory and catabolic gene expression and protein presence, both in healthy and OA animals. OxLDL did not affect human chondrocyte viability, ADAMTS5 and liver X receptor (LXR) α gene expression, but decreased the induction of IL-1β, IL-6, MCP-1, MMP-13, iNOS, and COX-2 gene expression and MMP-13 and COX-2 protein presence, evoked by cytokines. Conclusions: Our data suggest that cholesterol intake per se may not be deleterious for articular cartilage. Instead, cholesterol de novo synthesis and altered cholesterol metabolism could be involved in the associations observed in human disease.
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Affiliation(s)
- Amanda Villalvilla
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Ane Larrañaga-Vera
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Ana Lamuedra
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Sandra Pérez-Baos
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Alberto G López-Reyes
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain.,Geroscience Laboratory, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico
| | - Gabriel Herrero-Beaumont
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Raquel Largo
- Bone and Joint Research Unit, Instituto de Investigación Sanitaria Fundación Jiménez Diaz (IIS-FJD), Universidad Autónoma de Madrid (UAM), Madrid, Spain
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11
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Dong XL, Yu WX, Li CM, Zhou LP, Wong MS. Chuanxiong (Rhizome of Ligusticum chuanxiong) Protects Ovariectomized Hyperlipidemic Rats from Bone Loss. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2020; 48:463-485. [PMID: 32138532 DOI: 10.1142/s0192415x2050024x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Oxidative stress (OS) is the common mechanism for age-related diseases. The co-occurrence of osteoporosis (OP) and cardiovascular disease (CVD) in postmenopausal women makes it warranted to find a holistic approach for treatment of multiple diseases or conditions. The rhizome of Ligusticum chuanxiong Hort. (CX), which has high anti-oxidant properties and is widely used for CVD treatment in China, might be the potential candidate. In the present study, CX ethanol extract (CXE) was applied to H2O2 induced MG63 cells to study its effects and mechanisms on osteoblastogenesis against OS. CXE was then administered to six-month-old Sprague Dawley sham or ovariectomized (OVX) rats fed either a low saturated fat-sucrose (LFS) or a high fat-sucrose (HFS) diet for 12 weeks, to confirm its anti-osteoporotic effects. The results demonstrated that CXE directly improved proliferation and differentiation in vitro in an H2O2-induced osteoblast cell model by attenuating cellular reactive oxygen species levels and inhibiting osteoblast apoptosis via PI3K/Akt signaling pathway. CXE significantly improved bone properties as revealed by the increase in trabecular bone mineral density and decrease in trabecular separation at proximal metaphysis of the tibia (PT) in HFS-fed OVX rats but not in LFS-fed OVX rats. CXE ameliorated dyslipidemia, greatly reduced lipid deposition and malondialdehyde levels, improved activities of superoxide dismutase, catalase and glutathione peroxidase in the livers of HFS-fed OVX rats. In conclusion, CXE could favor osteoblastogenesis against OS. The ability of CXE to reduce bone loss in HFS-fed OVX rats was associated with its abilities to correct dyslipidemia, and reduce lipid deposition and OS levels.
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Affiliation(s)
- Xiao-Li Dong
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), Shenzhen, China.,Key Laboratory of Food Biological Safety Control, Shenzhen, China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
| | - Wen-Xuan Yu
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
| | - Chun-Mei Li
- Department of Biochemistry and Molecular Biology, Guangdong Pharmaceutical University, Guangzhou, China
| | - Li-Ping Zhou
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
| | - Man-Sau Wong
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), Shenzhen, China.,Key Laboratory of Food Biological Safety Control, Shenzhen, China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
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12
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Dundar S, Bozoglan A, Bulmus O, Tekin S, Yildirim TT, Kirtay M, Toy VE, Gul M, Bozoglan MY. Effects of restraint stress and high-fat diet on osseointegration of titanium implants: an experimental study. Braz Oral Res 2020; 34:e008. [PMID: 32049109 DOI: 10.1590/1807-3107bor-2020.vol34.0008] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 12/10/2019] [Indexed: 12/17/2022] Open
Abstract
This study aimed to investigate the effects of chronic restraint stress (RS) and a high-fat diet (HFD) on the osseointegration of titanium implants in a rat model. After the surgical insertion of titanium implants into the metaphysis of the tibial bone, the rats were randomly divided into four equal groups (n = 8 each): control (CNT), restraint stress (RS), high-fat diet (HFD), and restraint stress plus high fat diet (RS-HFD). CNT: Rats received no further treatment during the 92-day experimental period. RS: Stress was applied to the rats beginning from two days after the implant surgery for one hour per day for the first 30 days, two hours per day for the next 30 days, and three hours per day for the last 30 days. HFD: Rats were fed a HFD for the following 90 days starting two days after surgery. RS-HFD: Rats were fed a HFD and RS was applied to rats for the following 90 days, starting two days after surgery. At the end of the experimental period, the rats were euthanized, and the implants and surrounding bone tissues were removed for histological analysis. Statistical analysis was performed by one way ANOVA and Bonferrroni tests. There were no significant differences in the bone-implant connection levels between the groups (p > 0.05), but in the HFD and RS-HFD groups, the bone filling ratios were found to be lower compared with the controls (p < 0.05) The data analyzed in this study suggest that an HFD with or without chronic RS adversely affected bone tissue in the rats during the 90-day osseointegration period.
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Affiliation(s)
- Serkan Dundar
- Firat University, Faculty of Dentistry, Department of Periodontology, Elazig, Turkey
| | - Alihan Bozoglan
- Firat University, Faculty of Dentistry, Department of Periodontology, Elazig, Turkey
| | - Ozgur Bulmus
- Firat University, Faculty of Medicine, Department of Physiology, Elazig, Turkey
| | - Samet Tekin
- Firat University, Faculty of Dentistry, Department of Prosthodontics, Elazig, Turkey
| | - Tuba Talo Yildirim
- Firat University, Faculty of Dentistry, Department of Periodontology, Elazig, Turkey
| | | | - Vesile Elif Toy
- Inonu University, Faculty of Dentistry, Department of Periodontology, Malatya, Turkey
| | - Mehmet Gul
- Harran University, Faculty of Dentistry, Department of Periodontology, Sanliurfa, Turkey
| | - Merve Yilmaz Bozoglan
- Ministry of Health, Elazig Health Directorate, Department of Paharmacology, Elazig, Turkey
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13
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Perturbations of Lipids and Oxidized Phospholipids in Lipoproteins of Patients with Postmenopausal Osteoporosis Evaluated by Asymmetrical Flow Field-Flow Fractionation and Nanoflow UHPLC-ESI-MS/MS. Antioxidants (Basel) 2020; 9:antiox9010046. [PMID: 31948114 PMCID: PMC7022717 DOI: 10.3390/antiox9010046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 12/31/2019] [Accepted: 01/03/2020] [Indexed: 12/22/2022] Open
Abstract
Osteoporosis, a degenerative bone disease characterized by reduced bone mass and high risk of fragility, is associated with the alteration of circulating lipids, especially oxidized phospholipids (Ox-PLs). This study evaluated the lipidomic changes in lipoproteins of patients with postmenopausal osteoporosis (PMOp) vs. postmenopausal healthy controls. High-density lipoproteins (HDL) and low-density lipoproteins (LDL) from plasma samples were size-sorted by asymmetrical flow field-flow fractionation (AF4). Lipids from each lipoprotein were analyzed by nanoflow ultrahigh performance liquid chromatography-electrospray ionization-tandem mass spectrometry (nUHPLC-ESI-MS/MS). A significant difference was observed in a subset of lipids, most of which were increased in patients with PMOp, when compared to control. Phosphatidylethanolamine plasmalogen, which plays an antioxidative role, was increased in both lipoproteins (P-16:0/20:4, P-18:0/20:4, and P-18:1/20:4) lysophosphatidic acid 16:0, and six phosphatidylcholines were largely increased in HDL, but triacylglycerols (50:4 and 54:6) and overall ceramide levels were significantly increased only in LDL of patients with PMOp. Further investigation of 33 Ox-PLs showed significant lipid oxidation in PLs with highly unsaturated acyl chains, which were decreased in LDL of patients with PMOp. The present study demonstrated that AF4 with nUHPLC-ESI-MS/MS can be utilized to systematically profile Ox-PLs in the LDL of patients with PMOp.
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14
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Chin KY, Wong SK, Ekeuku SO, Pang KL. Relationship Between Metabolic Syndrome and Bone Health - An Evaluation of Epidemiological Studies and Mechanisms Involved. Diabetes Metab Syndr Obes 2020; 13:3667-3690. [PMID: 33116718 PMCID: PMC7569044 DOI: 10.2147/dmso.s275560] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 09/22/2020] [Indexed: 12/20/2022] Open
Abstract
Metabolic syndrome (MetS) and osteoporosis are two medical problems plaguing the ageing populations worldwide. Though seemingly distinctive to each other, metabolic derangements are shown to influence bone health. This review summarises the relationship between MetS and bone health derived from epidemiological studies and explains the mechanistic basis of this relationship. The discourse focuses on the link between MetS and bone mineral density, quantitative sonometric indices, geometry and fracture risk in humans. The interesting sex-specific trend in the relationship, probably due to factors related to body composition and hormonal status, is discussed. Mechanistically, each component of MetS affects the bone distinctly, forming a complex interacting network influencing the skeleton. Lastly, the effects of MetS management, such as pharmacotherapies, exercise and bariatric surgery, on bone, are presented. This review aims to highlight the significant relationship between MetS and bone, and proper management of MetS with the skeletal system in mind could prevent cardiovascular and bone complications.
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Affiliation(s)
- Kok-Yong Chin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
- Correspondence: Kok-Yong Chin Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur, MalaysiaTel +60 3-9145 9573 Email
| | - Sok Kuan Wong
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Sophia Ogechi Ekeuku
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Kok-Lun Pang
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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15
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Alekos NS, Moorer MC, Riddle RC. Dual Effects of Lipid Metabolism on Osteoblast Function. Front Endocrinol (Lausanne) 2020; 11:578194. [PMID: 33071983 PMCID: PMC7538543 DOI: 10.3389/fendo.2020.578194] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 08/25/2020] [Indexed: 12/14/2022] Open
Abstract
The skeleton is a dynamic and metabolically active organ with the capacity to influence whole body metabolism. This newly recognized function has propagated interest in the connection between bone health and metabolic dysfunction. Osteoblasts, the specialized mesenchymal cells responsible for the production of bone matrix and mineralization, rely on multiple fuel sources. The utilization of glucose by osteoblasts has long been a focus of research, however, lipids and their derivatives, are increasingly recognized as a vital energy source. Osteoblasts possess the necessary receptors and catabolic enzymes for internalization and utilization of circulating lipids. Disruption of these processes can impair osteoblast function, resulting in skeletal deficits while simultaneously altering whole body lipid homeostasis. This article provides an overview of the metabolism of postprandial and stored lipids and the osteoblast's ability to acquire and utilize these molecules. We focus on the requirement for fatty acid oxidation and the pathways regulating this function as well as the negative impact of dyslipidemia on the osteoblast and skeletal health. These findings provide key insights into the nuances of lipid metabolism in influencing skeletal homeostasis which are critical to appreciate the extent of the osteoblast's role in metabolic homeostasis.
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Affiliation(s)
- Nathalie S. Alekos
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Megan C. Moorer
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Baltimore Veterans Administration Medical Center, Baltimore, MD, United States
| | - Ryan C. Riddle
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Baltimore Veterans Administration Medical Center, Baltimore, MD, United States
- *Correspondence: Ryan C. Riddle
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16
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de Oliveira Peixoto J, Savoldi IR, Ibelli AMG, Cantão ME, Jaenisch FRF, Giachetto PF, Settles ML, Zanella R, Marchesi JAP, Pandolfi JR, Coutinho LL, Ledur MC. Proximal femoral head transcriptome reveals novel candidate genes related to epiphysiolysis in broiler chickens. BMC Genomics 2019; 20:1031. [PMID: 31888477 PMCID: PMC6937697 DOI: 10.1186/s12864-019-6411-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 12/18/2019] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND The proximal femoral head separation (FHS) or epiphysiolysis is a prevalent disorder affecting the chicken femur epiphysis, being considered a risk factor to infection which can cause bacterial chondronecrosis with osteomyelitis in broilers. To identify the genetic mechanisms involved in epiphysiolysis, differentially expressed (DE) genes in the femur of normal and FHS-affected broilers were identified using RNA-Seq technology. Femoral growth plate (GP) samples from 35-day-old commercial male broilers were collected from 4 healthy and 4 FHS-affected broilers. Sequencing was performed using an Illumina paired-end protocol. Differentially expressed genes were obtained using the edgeR package based on the False Discovery Rate (FDR < 0.05). RESULTS Approximately 16 million reads/sample were generated with 2 × 100 bp paired-end reads. After data quality control, approximately 12 million reads/sample were mapped to the reference chicken genome (Galgal5). A total of 12,645 genes were expressed in the femur GP. Out of those, 314 were DE between groups, being 154 upregulated and 160 downregulated in FHS-affected broilers. In the functional analyses, several biological processes (BP) were overrepresented. Among them, those related to cell adhesion, extracellular matrix (ECM), bone development, blood circulation and lipid metabolism, which are more related to chicken growth, are possibly involved with the onset of FHS. On the other hand, BP associated to apoptosis or cell death and immune response, which were also found in our study, could be related to the consequence of the FHS. CONCLUSIONS Genes with potential role in the epiphysiolysis were identified through the femur head transcriptome analysis, providing a better understanding of the mechanisms that regulate bone development in fast-growing chickens. In this study, we highlighted the importance of cell adhesion and extracellular matrix related genes in triggering FHS. Furthermore, we have shown new insights on the involvement of lipidemia and immune response/inflammation with FHS in broilers. Understanding the changes in the GP transcriptome might support breeding strategies to address poultry robustness and to obtain more resilient broilers.
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Affiliation(s)
- Jane de Oliveira Peixoto
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
- Programa de Pós-Graduação em Ciências Veterinárias, Universidade Estadual do Centro-Oeste, Guarapuava, Paraná, Brazil
| | - Igor Ricardo Savoldi
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
- Universidade do Contestado, Concórdia, Santa Catarina Brazil
- Programa de Pós-Graduação em Zootecnia, UDESC-Oeste, Chapecó, SC Brazil
| | - Adriana Mércia Guaratini Ibelli
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
- Programa de Pós-Graduação em Ciências Veterinárias, Universidade Estadual do Centro-Oeste, Guarapuava, Paraná, Brazil
- Universidade do Contestado, Concórdia, Santa Catarina Brazil
| | - Maurício Egídio Cantão
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
| | - Fátima Regina Ferreira Jaenisch
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
| | | | | | - Ricardo Zanella
- Universidade de Passo Fundo, Passo Fundo, RS Brazil
- Programa de Mestrado em BioExperimentação, UPF, Passo Fundo, RS Brazil
| | - Jorge Augusto Petroli Marchesi
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP Brazil
| | - José Rodrigo Pandolfi
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
| | | | - Mônica Corrêa Ledur
- Embrapa Suínos e Aves, Rodovia BR-153, Km 110, Distrito de Tamanduá, Caixa Postal: 321, Concórdia, Santa Catarina 89715-899 Brazil
- Programa de Pós-Graduação em Zootecnia, UDESC-Oeste, Chapecó, SC Brazil
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17
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Chin KY, Ima-Nirwana S. The Role of Tocotrienol in Preventing Male Osteoporosis-A Review of Current Evidence. Int J Mol Sci 2019; 20:E1355. [PMID: 30889819 PMCID: PMC6471446 DOI: 10.3390/ijms20061355] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 12/15/2022] Open
Abstract
Male osteoporosis is a significant but undetermined healthcare problem. Men suffer from a higher mortality rate post-fracture than women and they are marginalized in osteoporosis treatment. The current prophylactic agents for osteoporosis are limited. Functional food components such as tocotrienol may be an alternative option for osteoporosis prevention in men. This paper aims to review the current evidence regarding the skeletal effects of tocotrienol in animal models of male osteoporosis and its potential antiosteoporotic mechanism. The efficacy of tocotrienol of various sources (single isoform, palm and annatto vitamin E mixture) had been tested in animal models of bone loss induced by testosterone deficiency (orchidectomy and buserelin), metabolic syndrome, nicotine, alcoholism, and glucocorticoid. The treated animals showed improvements ranging from bone microstructural indices, histomorphometric indices, calcium content, and mechanical strength. The bone-sparing effects of tocotrienol may be exerted through its antioxidant, anti-inflammatory, and mevalonate-suppressive pathways. However, information pertaining to its mechanism of actions is superficial and warrants further studies. As a conclusion, tocotrienol could serve as a functional food component to prevent male osteoporosis, but its application requires validation from a clinical trial in men.
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Affiliation(s)
- Kok-Yong Chin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, 56000 Cheras, Malaysia.
| | - Soelaiman Ima-Nirwana
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, 56000 Cheras, Malaysia.
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18
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Liu Q, Wang Z, Dong X, Wang H, Lan J. Calcium, Phosphorus and Oxygen Around Implant at Early Osseointegration in Hyperlipidemic Rats. J HARD TISSUE BIOL 2019. [DOI: 10.2485/jhtb.28.57] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Qibo Liu
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University
- Department of Prosthodontics, School of Stomotology, Shandong University
| | - Zhifeng Wang
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University
- Department of Pediatric Dentistry, School of Stomotology, Shandong University
| | - Xiaofei Dong
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei- MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University
| | - Hui Wang
- Department of Dental Implantology, Affiliated Stomological Hospital of Suzhou University
| | - Jing Lan
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University
- Department of Prosthodontics, School of Stomotology, Shandong University
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19
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Xu LN, Shao SY, Zhu WQ, Chen C, Zhang SM, Qiu J. Low density lipoprotein adsorption on a titanium surface and its effect on osteoblast behaviors. RSC Adv 2019; 9:18589-18598. [PMID: 35515248 PMCID: PMC9064810 DOI: 10.1039/c9ra03173a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 06/04/2019] [Indexed: 12/25/2022] Open
Abstract
Objective: This study aims to investigate the adsorption of low density lipoprotein (LDL) on a titanium surface and to explore its effect on osteoblast behaviors. Materials and methods: LDL adsorption on a titanium surface was analyzed using LDL assay and X-ray photoelectron spectroscopy (XPS). Physical properties, including topography, surface roughness and wettability of a control smooth titanium surface and a LDL pre-adsorbed titanium surface, were assessed. Subsequently, the adhesion, proliferation and differentiation abilities of MC3T3-E1 cells (an osteoblast-like cell line) on the surfaces of control titanium and LDL pre-adsorbed titanium were investigated. Results: LDL assay and XPS confirmed LDL adsorption on the titanium surface. The maximum adsorption of LDL on the titanium surfaces was observed after 150 minutes of incubation. In comparison with the control smooth titanium surface, the roughness and hydrophilicity of the LDL pre-adsorbed titanium surface were significantly altered. Furthermore, in vitro studies demonstrated that LDL adsorption obviously attenuated the adhesion, proliferation and differentiation of MC3T3-E1 cells on the titanium surface. Conclusion: LDL could adsorb on a titanium surface. Meanwhile, LDL adsorption changed the characteristics of the titanium surface, which, in turn, negatively regulated osteoblast behaviors. This study aims to investigate the adsorption of low density lipoprotein (LDL) on a titanium surface and to explore its effect on osteoblast behaviors.![]()
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Affiliation(s)
- Li-na Xu
- Department of Oral Implantology
- Affiliated Hospital of Stomatology
- Nanjing Medical University
- Nanjing
- PR China
| | - Shui-yi Shao
- Department of Oral Implantology
- Affiliated Hospital of Stomatology
- Nanjing Medical University
- Nanjing
- PR China
| | - Wen-qing Zhu
- Department of Oral Implantology
- Affiliated Hospital of Stomatology
- Nanjing Medical University
- Nanjing
- PR China
| | - Chao Chen
- Department of Oral Implantology
- Huaxia Hospital of Stomatology
- Suzhou
- PR China
| | - Song-mei Zhang
- Department of General Dentistry
- Eastman Institute for Oral Health
- University of Rochester
- Rochester
- USA
| | - Jing Qiu
- Department of Oral Implantology
- Affiliated Hospital of Stomatology
- Nanjing Medical University
- Nanjing
- PR China
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20
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Dawodu D, Patecki M, Hegermann J, Dumler I, Haller H, Kiyan Y. oxLDL inhibits differentiation and functional activity of osteoclasts via scavenger receptor-A mediated autophagy and cathepsin K secretion. Sci Rep 2018; 8:11604. [PMID: 30072716 PMCID: PMC6072764 DOI: 10.1038/s41598-018-29963-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 07/19/2018] [Indexed: 12/24/2022] Open
Abstract
Resorptive activity of osteoclasts is important for maintaining bone homeostasis. Endogenous compounds such as oxidized low density lipoprotein (oxLDL) have been shown to disturb this activity. While some studies have investigated the effects of oxLDL on the process of osteoclastogenesis, the underlying mechanism are not fully understood. We show here that oxLDL concentrations of ~10-25 µg protein (0.43-1.0 µM MDA/mg protein) completely blocked the formation of functional osteoclasts. The underlying mechanism implies an inhibition of autophagy that in turn leads to a decreased fusion of cathepsin K (CatK)-loaded lysosomal vesicles with the ruffled border membrane. As result, a lower secretion of CatK and impaired protonation of the resorption lacunae by vacuolar-ATPase (v-ATPase) is observed in the presence of oxLDL. We demonstrate that scavenger receptor A (SR-A) mediates oxLDL effects on osteoclastogenesis and repressing this receptor partially rescued oxLDL effects. Collectively, our data provides an insight into the possible mechanism of oxLDL on osteoclastogenesis suggesting that it does not perturb the packaging of CatK and v-ATPase (V-a3) in the secretory lysosome, but inhibits the fusion of these lysosomes to the ruffled border. The relevance of our findings suggests a distinct link between oxLDL, autophagy and osteoclastogenesis.
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Affiliation(s)
- Damilola Dawodu
- Department of Nephrology and Hypertensiology, Hannover Medical School, Hannover, Germany
| | - Margret Patecki
- Department of Nephrology and Hypertensiology, Hannover Medical School, Hannover, Germany
| | - Jan Hegermann
- Research Core Unit Electron Microscopy, Hannover Medical School, Hannover, Germany
| | - Inna Dumler
- Department of Nephrology and Hypertensiology, Hannover Medical School, Hannover, Germany
| | - Hermann Haller
- Department of Nephrology and Hypertensiology, Hannover Medical School, Hannover, Germany
| | - Yulia Kiyan
- Department of Nephrology and Hypertensiology, Hannover Medical School, Hannover, Germany.
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21
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Ambrogini E, Que X, Wang S, Yamaguchi F, Weinstein RS, Tsimikas S, Manolagas SC, Witztum JL, Jilka RL. Oxidation-specific epitopes restrain bone formation. Nat Commun 2018; 9:2193. [PMID: 29875355 PMCID: PMC5990540 DOI: 10.1038/s41467-018-04047-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 03/26/2018] [Indexed: 12/14/2022] Open
Abstract
Atherosclerosis and osteoporosis are epidemiologically linked and oxidation specific epitopes (OSEs), such as phosphocholine (PC) of oxidized phospholipids (PC-OxPL) and malondialdehyde (MDA), are pathogenic in both. The proatherogenic effects of OSEs are opposed by innate immune antibodies. Here we show that high-fat diet (HFD)-induced bone loss is attenuated in mice expressing a single chain variable region fragment of the IgM E06 (E06-scFv) that neutralizes PC-OxPL, by increasing osteoblast number and stimulating bone formation. Similarly, HFD-induced bone loss is attenuated in mice expressing IK17-scFv, which neutralizes MDA. Notably, E06-scFv also increases bone mass in mice fed a normal diet. Moreover, the levels of anti-PC IgM decrease in aged mice. We conclude that OSEs, whether produced chronically or increased by HFD, restrain bone formation, and that diminished defense against OSEs may contribute to age-related bone loss. Anti-OSEs, therefore, may represent a novel therapeutic approach against osteoporosis and atherosclerosis simultaneously.
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Affiliation(s)
- Elena Ambrogini
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, 4301W. Markham, Little Rock, AR, 72205, USA.
| | - Xuchu Que
- Division of Endocrinology and Metabolism, University of California San Diego, La Jolla, CA, 92093-0682, USA
| | - Shuling Wang
- Division of Endocrinology and Metabolism, University of California San Diego, La Jolla, CA, 92093-0682, USA
| | - Fumihiro Yamaguchi
- Division of Endocrinology and Metabolism, University of California San Diego, La Jolla, CA, 92093-0682, USA
| | - Robert S Weinstein
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, 4301W. Markham, Little Rock, AR, 72205, USA
| | - Sotirios Tsimikas
- Department of Medicine, Cardiololgy, University of California San Diego, 9500 GilmanDrive, La Jolla, CA, 92093-0682, USA
| | - Stavros C Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, 4301W. Markham, Little Rock, AR, 72205, USA
| | - Joseph L Witztum
- Division of Endocrinology and Metabolism, University of California San Diego, La Jolla, CA, 92093-0682, USA
| | - Robert L Jilka
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, 4301W. Markham, Little Rock, AR, 72205, USA
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22
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Xiaofei D, Hui W, Jing L. [Disheveled 2 around the implant at an early stage of hyperlipidemic rats]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2018; 36:82-86. [PMID: 29595002 DOI: 10.7518/hxkq.2018.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OBJECTIVE This study aims to investigate the expression of disheveled 2 (Dvl2) around the implant of hyperlipidemic rats at an early stage after the implantation. METHODS A total of 24 Wistar rats were divided equally into the experimental group fed with high-fat diet group and control group fed with a normal diet. After 8 weeks, the serum lipid levels were detected, and rats received implants in the femur metaphysis. Rats were sacrificed at 1, 3, and 5 days after implantation, and the bones around implants were obtained. Methylene blue-acid fuchsin staining was performed to observe the implant-bone interface. Real-time polymerase chain reaction was performed on runt-related transcription factor 2 (Runx2), cathepsin K (CatK), and Dvl2. Dvl2 Western blot or immunoprecipitation, phosphorylation, and ubiquitination were also conducted. RESULTS In the experimental group, less osteoblasts, lower expression of Runx2 and Dvl2, and lower Dvl2 phosphorylation (P<0.05) than those of the control group were observed; furthermore, the CatK expression and Dvl2 ubiquitination were higher than those in the control group (P<0.05). CONCLUSIONS Hyperlipidemia may suppress bone remodeling around the implant at an early stage by Dvl2 down-regulation, phosphorylation, and up-regulated ubiquitination.
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Affiliation(s)
- Dong Xiaofei
- Dept. of Prosthodontics, School of Stomotology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China
| | - Wang Hui
- Dept. of Dental Implantology, The Affiliated Stomological Hospital of Suzhou University, Suzhou 215000, China
| | - Lan Jing
- Dept. of Prosthodontics, School of Stomotology, Shandong University, Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, China
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23
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Dong XL, Yu WX, Li CM, He S, Zhou LP, Poon CW, Wong MS. Danshen (Salvia miltiorrhiza) protects ovariectomized rats fed with high-saturated fat-sucrose diet from bone loss. Osteoporos Int 2018; 29:223-235. [PMID: 29058051 DOI: 10.1007/s00198-017-4254-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 10/04/2017] [Indexed: 12/15/2022]
Abstract
UNLABELLED Dietary patterns may interfere with the efficacy of herbal intervention. Our results demonstrated the protective effects of Salvia miltiorrhiza aqueous extract (SMA) on bone metabolism were influenced by levels of dietary fat and sucrose in ovariectomized (OVX) rats through its actions on attenuating lipid deposition and oxidative stress in rats. INTRODUCTION Salvia miltiorrhiza (SM), also known as Danshen, has been tested as an osteoporosis treatment in a series of small, short human trials that generally report improvements in bone property. However, dietary patterns may interfere with the effects of herbal intervention. We hypothesized that dietary fat and sucrose levels could influence the effects of SM supplementation on bone in estrogen-deficient animals. METHODS Six-month-old Sprague-Dawley sham or OVX rats were fed either a low-saturated fat-sucrose (LFS, a diet that was similar in composition to normal rat chow) or a high-fat-sucrose (HFS) diet and OVX rats were treated (8 rats/group) with SM aqueous extract (SMA, 600 mg/kg/day), 17β-estradiol (1 mg/kg/day), or vehicle for 12 weeks. RESULTS SMA significantly improved bone properties as revealed by the increase in trabecular bone mineral density and decrease in trabecular separation at proximal metaphysis of the tibia (PT) in HFS-fed OVX rats, but not in LFS-fed OVX rats. SMA greatly reduced lipid deposition and malondialdehyde levels, improved the activities of superoxide dismutase, catalase, and glutathione peroxidase in the livers of HFS-fed OVX rats. SMA could directly improve the proliferation and differentiation in vitro in an H2O2-induced preosteoblast cell model by attenuating cellular reactive oxygen species levels. CONCLUSIONS The protective effects of SMA on bone metabolism were influenced by dietary fat and sucrose levels in OVX rats. The ability of SMA to reduce bone loss in HFS-fed OVX rats was associated with the attenuation of lipid deposition and oxidative stress levels.
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Affiliation(s)
- X L Dong
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, People's Republic of China
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - W X Yu
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, People's Republic of China
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - C M Li
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, People's Republic of China
- Department of Biochemistry and Molecular Biology, Guangdong Pharmaceutical College, Guangzhou, People's Republic of China
| | - S He
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - L P Zhou
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - C W Poon
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - M S Wong
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, People's Republic of China.
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Y806, Hung Hom, Kowloon, Hong Kong, People's Republic of China.
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Casado-Díaz A, Túnez-Fiñana I, Mata-Granados JM, Ruiz-Méndez MV, Dorado G, Romero-Sánchez MC, Navarro-Valverde C, Quesada-Gómez JM. Serum from postmenopausal women treated with a by-product of olive-oil extraction process stimulates osteoblastogenesis and inhibits adipogenesis in human mesenchymal stem-cells (MSC). Exp Gerontol 2017; 90:71-78. [PMID: 28167238 DOI: 10.1016/j.exger.2017.01.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 01/24/2017] [Accepted: 01/26/2017] [Indexed: 12/23/2022]
Abstract
Aging may enhance both oxidative stress and bone-marrow mesenchymal stem-cell (MSC) differentiation into adipocytes. That reduces osteoblastogenesis, thus favoring bone-mass loss and fracture, representing an important worldwide health-issue, mainly in countries with aging populations. Intake of antioxidant products may help to retain bone-mass density. Interestingly, a novel olive-pomace physical treatment to generate olive oil also yields by-products rich in functional antioxidants. Thus, diet of postmenopausal women was supplemented for two months with one of such by-products (distillate 6; D6), being rich in squalene. After treatment, serum from such women showed reduced both lipidic peroxidation and oxidized low-density lipoprotein (LDL). Besides, vitamin E and coenzyme Q10 levels increased. Furthermore, culture medium containing 10% of such serum both increased osteoblastogenesis and reduced adipogenesis in human MSC from bone marrow. Therefore, highly antioxidant by-products like D6 may represent a relevant source for development of functional products, for both prevention and treatment of degenerative pathologies associated with aging, like osteoporosis.
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Affiliation(s)
- Antonio Casado-Díaz
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Unidad de Gestión Clínica (UGC) de Endocrinología y Nutrición, Hospital Universitario Reina Sofía, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain; RETICEF & CIBER de Fragilidad y Envejecimento Saludable (CIBERFES), Spain
| | - Isaac Túnez-Fiñana
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Unidad de Gestión Clínica (UGC) de Endocrinología y Nutrición, Hospital Universitario Reina Sofía, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain; Dep. Bioquímica y Biología Molecular, Facultad de Medicina y Enfermería, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain
| | - José María Mata-Granados
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Unidad de Gestión Clínica (UGC) de Endocrinología y Nutrición, Hospital Universitario Reina Sofía, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain
| | - María Victoria Ruiz-Méndez
- Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide E46, Ctra. de Utrera km 1, 41013 Sevilla, Spain
| | - Gabriel Dorado
- Dep. Bioquímica y Biología Molecular, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario (ceiA3), Campus Rabanales C6-1-E17, 14071 Córdoba, Spain; RETICEF & CIBER de Fragilidad y Envejecimento Saludable (CIBERFES), Spain
| | - María Concepción Romero-Sánchez
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Unidad de Gestión Clínica (UGC) de Endocrinología y Nutrición, Hospital Universitario Reina Sofía, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain; RETICEF & CIBER de Fragilidad y Envejecimento Saludable (CIBERFES), Spain
| | | | - José Manuel Quesada-Gómez
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Unidad de Gestión Clínica (UGC) de Endocrinología y Nutrición, Hospital Universitario Reina Sofía, Universidad de Córdoba, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain; RETICEF & CIBER de Fragilidad y Envejecimento Saludable (CIBERFES), Spain.
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25
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Dündar S, Yaman F, Ozupek MF, Saybak A, Gul M, Asutay F, Kirtay M, Ozercan IH. The effects of high-fat diet on implant osseointegration: an experimental study. J Korean Assoc Oral Maxillofac Surg 2016; 42:187-92. [PMID: 27595085 PMCID: PMC5009192 DOI: 10.5125/jkaoms.2016.42.4.187] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/22/2016] [Accepted: 05/04/2016] [Indexed: 11/18/2022] Open
Abstract
Objectives In this study, we investigated whether a high-fat diet (HFD) affected the bone implant connection (BIC) in peri-implant bone. Materials and Methods Four male rabbits were used in this study. Dental implant surgery was introduced into each tibia, and four implants were integrated into each animal. In both the normal diet (ND) group (n=2) and HFD group (n=2), 8 implants were integrated, for a total of 16 integrated implants. The animals continued with their respective diets for 12 weeks post-surgery. Afterward, the rabbits were sacrificed, and the BIC was assessed histomorphometrically. Results Histologic and histomorphometric analyses demonstrated that BIC was not impaired in the HFD group compared to the ND group. Conclusion Within the limitations of this study, we found that HFD did not decrease the BIC in rabbit tibias.
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Affiliation(s)
- Serkan Dündar
- Department of Periodontology, Faculty of Dentistry, Firat University, Elazig, Turkey
| | - Ferhan Yaman
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - Muhammed Fatih Ozupek
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Inonu University, Malatya, Turkey
| | - Arif Saybak
- Periodontists, Private Practice, Adana, Turkey
| | - Mehmet Gul
- Department of Periodontology, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | - Fatih Asutay
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Afyon Kocatepe University, Afyonkarahisar, Turkey
| | - Mustafa Kirtay
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Inonu University, Malatya, Turkey
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26
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Dong XL, Li CM, Cao SS, Zhou LP, Wong MS. A High-Saturated-Fat, High-Sucrose Diet Aggravates Bone Loss in Ovariectomized Female Rats. J Nutr 2016; 146:1172-9. [PMID: 27099231 DOI: 10.3945/jn.115.225474] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 03/21/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Estrogen deficiency in women and high-saturated fat, high-sucrose (HFS) diets have both been recognized as risk factors for metabolic syndrome. Studies on the combined actions of these 2 detrimental factors on the bone in females are limited. OBJECTIVE We sought to determine the interactive actions of estrogen deficiency and an HFS diet on bone properties and to investigate the underlying mechanisms. METHODS Six-month-old Sprague Dawley sham or ovariectomized (OVX) rats were pair fed the same amount of either a low-saturated-fat, low-sucrose (LFS) diet (13% fat calories; 15% sucrose calories) or an HFS diet (42% fat calories; 30% sucrose calories) for 12 wk. Blood, liver, and bone were collected for correspondent parameters measurement. RESULTS Ovariectomy decreased bone mineral density in the tibia head (TH) by 62% and the femoral end (FE) by 49% (P < 0.0001). The HFS diet aggravated bone loss in OVX rats by an additional 41% in the TH and 37% in the FE (P < 0.05). Bone loss in the HFS-OVX rats was accompanied by increased urinary deoxypyridinoline concentrations by 28% (P < 0.05). The HFS diet induced cathepsin K by 145% but reduced osteoprotegerin mRNA expression at the FE of the HFS-sham rats by 71% (P < 0.05). Ovariectomy significantly increased peroxisome proliferator-activated receptor γ mRNA expression by 136% and 170% at the FE of the LFS- and HFS-OVX rats, respectively (P < 0.05). The HFS diet aggravated ovariectomy-induced lipid deposition and oxidative stress (OS) in rat livers (P < 0.05). Trabecular bone mineral density at the FE was negatively correlated with rat liver malondialdehyde concentrations (R(2) = 0.39; P < 0.01). CONCLUSIONS The detrimental actions of the HFS diet and ovariectomy on bone properties in rats occurred mainly in cancellous bones and were characterized by a high degree of bone resorption and alterations in OS.
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Affiliation(s)
- Xiao-Li Dong
- Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen, China; Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Shenzhen State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation) and
| | - Chun-Mei Li
- Shenzhen State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation) and College of Light Industry and Food, South China University of Technology, Guangzhou, China; and Department of Biochemistry and Molecular Biology, Guangdong Pharmaceutical College, Guangzhou, China
| | - Si-Si Cao
- Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen, China; Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Li-Ping Zhou
- Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen, China; Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Man-Sau Wong
- Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen, China; Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Shenzhen State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation) and
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27
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Liu Y, Almeida M, Weinstein RS, O'Brien CA, Manolagas SC, Jilka RL. Skeletal inflammation and attenuation of Wnt signaling, Wnt ligand expression, and bone formation in atherosclerotic ApoE-null mice. Am J Physiol Endocrinol Metab 2016; 310:E762-73. [PMID: 26956187 PMCID: PMC6415649 DOI: 10.1152/ajpendo.00501.2015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 03/07/2016] [Indexed: 12/18/2022]
Abstract
ApoE-null (ApoE-KO) mice fed a high-fat diet (HFD) develop atherosclerosis, due in part to activation of vascular inflammation by oxidized low-density lipoprotein. Since bone loss also occurs in these mice, we used them to investigate the impact of oxidized lipids on bone homeostasis and to search for underlying pathogenic pathways. Four-month-old female ApoE-KO mice fed a HFD for three months exhibited increased levels of oxidized lipids in bone, as well as decreased femoral and vertebral trabecular and cortical bone mass, compared with ApoE-KO mice on normal diet. Despite HFD-induced increase in expression of Alox15, a lipoxygenase that oxidizes LDL and promotes atherogenesis, global deletion of this gene failed to ameliorate the skeletal impact of HFD. Osteoblast number and function were dramatically reduced in trabecular and cortical bone of HFD-fed mice, whereas osteoclast number was modestly reduced only in trabecular bone, indicating that an imbalance in favor of osteoclasts was responsible for HFD-induced bone loss. These changes were associated with decreased osteoblast progenitors and increased monocyte/macrophages in the bone marrow as well as increased expression of IL-1β, IL-6, and TNF. HFD also attenuated Wnt signaling as evidenced by reduced expression of Wnt target genes, and it decreased expression of pro-osteoblastogenic Wnt ligands. These results suggest that oxidized lipids decrease bone mass by increasing anti-osteoblastogenic inflammatory cytokines and decreasing pro-osteoblastogenic Wnt ligands.
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Affiliation(s)
- Yu Liu
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Maria Almeida
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Robert S Weinstein
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Charles A O'Brien
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Stavros C Manolagas
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Robert L Jilka
- Center for Osteoporosis and Metabolic Bone Diseases, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas
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28
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Chin KY, Ima-Nirwana S, Mohamed IN, Ahmad F, Mohd Ramli ES, Aminuddin A, Wan Ngah WZ. The association between bone health indicated by calcaneal quantitative ultrasound and metabolic syndrome in Malaysian men. J Diabetes Metab Disord 2015; 14:9. [PMID: 25789255 PMCID: PMC4363070 DOI: 10.1186/s40200-015-0136-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 02/14/2015] [Indexed: 12/22/2022]
Abstract
BACKGROUND Previous studies on the relationship between bone health and metabolic syndrome (MS) have revealed heterogeneous results. There are limited studies employing bone quantitative ultrasonometry in evaluating this relationship. This study aimed to determine the relationship between MS and bone health in a group of Malaysian middle-aged and elderly men using bone quantitative ultrasonometry. METHODS This cross-sectional study recruited 309 free living Chinese and Malay men aged 40 years and above residing in Klang Valley, Malaysia. Their demographic and anthropometric data were collected. Their calcaneal speed of sound (SOS) was measured using a CM-200 bone ultrasonometer. Their blood was collected for the evaluation of lipid profile, total testosterone and sex hormone-binding globulin. The joint interim MS definition was used for the classification of subjects. Multiple linear regression analysis was used to assess the association between SOS and indicators of MS and the presence of MS, with suitable adjustment for confounders. RESULTS There was no significant difference in SOS value between MS and non-MS subjects (p > 0.05). The SOS values among subjects with different MS scores did not differ significantly (p > 0.05). There were no significant associations between SOS values and indicators of MS or the presence of MS (p > 0.05). CONCLUSIONS The relationship between bone health and MS is not significant in Malaysian middle-aged and elderly men. A longitudinal study should be conducted to evaluate the association between bone loss and MS to confirm this finding.
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Affiliation(s)
- Kok-Yong Chin
- Pharmacology Department, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak 56000 Cheras, Kuala Lumpur, Malaysia
| | - Soelaiman Ima-Nirwana
- Pharmacology Department, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak 56000 Cheras, Kuala Lumpur, Malaysia
| | - Isa Naina Mohamed
- Pharmacology Department, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak 56000 Cheras, Kuala Lumpur, Malaysia
| | - Fairus Ahmad
- Anatomy Department, Universiti Kebangsaan Malaysia, Medical Centre, Kuala Lumpur, Malaysia
| | - Elvy Suhana Mohd Ramli
- Anatomy Department, Universiti Kebangsaan Malaysia, Medical Centre, Kuala Lumpur, Malaysia
| | - Amilia Aminuddin
- Physiology Department, Universiti Kebangsaan Malaysia, Medical Centre, Kuala Lumpur, Malaysia
| | - Wan Zurinah Wan Ngah
- Biochemistry Department, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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Distribution of selected elements in calcific human aortic valves studied by microscopy combined with SR-μXRF: Influence of lipids on progression of calcification. Micron 2014; 67:141-148. [DOI: 10.1016/j.micron.2014.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 07/11/2014] [Accepted: 08/04/2014] [Indexed: 12/14/2022]
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Martineau C, Kevorkova O, Brissette L, Moreau R. Scavenger receptor class B, type I (Scarb1) deficiency promotes osteoblastogenesis but stunts terminal osteocyte differentiation. Physiol Rep 2014; 2:2/10/e12117. [PMID: 25281615 PMCID: PMC4254088 DOI: 10.14814/phy2.12117] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Scavenger receptor class B type I (SR-BI), the Scarb1 gene product, is a high-density lipoprotein (HDL) receptor which was shown to influence bone metabolism. Its absence in mice is associated with alterations of the glucocorticoid/adrenocorticotropic hormone axis, and translated in high bone mass and enhanced bone formation. Since the cellular alterations underlying the enhanced bone formation remain unknown, we investigated Scarb1-deficient marrow stromal cells (MSC) behavior in vitro. No difference in HDL3, cholesteryl ester (CE) or estradiol (E) association/binding was measured between Scarb1-null and wild-type (WT) cells. Scarb1 genic expression was down-regulated twofold following osteogenic treatment. Neither WT nor null cell proliferation was influenced by HDL3 exposure whereas this condition decreased genic expression of osteoblastic marker osterix (Sp7), and osteocyte markers sclerostin (Sost) and dentin matrix protein 1 (Dmp1) independently of genotype. Sost and Dmp1 basal expression in null cells was 40% and 50% that of WT cells; accordingly, osteocyte density was 20% lower in vertebrae from Scarb1-null mice. Genic expression of co-receptors for Wnt signaling, namely LDL-related protein (Lrp) 5 and Lrp8, was increased, respectively, by two- and threefold, and of transcription target-genes axis inhibition protein 2 (Axin2) and lymphoid enhancer-binding factor 1 (Lef1) over threefold. Gene expression of Wnt signaling agonist Wnt5a and of the antagonist dickkopfs-related protein 1 (Dkk1) were found to be increased 10- to 20-fold in null MSC. These data suggest alterations of Wnt pathways in Scarb1-deficient MSC potentially explaining their enhanced function, hence contributing to the high bone mass observed in these mice.
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Affiliation(s)
- Corine Martineau
- Laboratoire du Métabolisme Osseux, BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, H3C 3P8, Quebec, Canada
| | - Olha Kevorkova
- Laboratoire du Métabolisme Osseux, BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, H3C 3P8, Quebec, Canada
| | - Louise Brissette
- Laboratoire du Métabolisme des Lipoprotéines, Département des Sciences Biologiques, BioMed, Université du Québec à Montréal, Montréal, H3C 3P8, Quebec, Canada
| | - Robert Moreau
- Laboratoire du Métabolisme Osseux, BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, H3C 3P8, Quebec, Canada
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Sequential analysis of oxidative stress markers and vitamin C status in acute bacterial osteomyelitis. Mediators Inflamm 2014; 2014:975061. [PMID: 25180026 PMCID: PMC4142778 DOI: 10.1155/2014/975061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 07/28/2014] [Indexed: 01/03/2023] Open
Abstract
In bacterial bone infections, excessively formed oxidants may result in local and systemic oxidative stress. Vitamin C is the major extracellular nonenzymatic antioxidant, also implicated in bone cells metabolism and viability. The physiological functions of vitamin C largely depend on its redox status. We sequentially assessed oxidative stress markers, hydroperoxides and malondialdehyde (MDA), total antioxidant activity (AOA), total vitamin C, ascorbic acid (Asc), and oxidized/reduced vitamin C ratio in 137 patients with acute osteomyelitis (OM). Compared to 52 healthy controls, in OM group baseline serum hydroperoxides, MDA and oxidized/reduced vitamin C ratio were higher whilst Asc and AOA were lower (P < 0.05, resp.). On the other side, total vitamin C levels in patients and controls were similar (P > 0.05), thereby suggesting a relative rather than absolute vitamin C deficiency in OM. During the follow-up, oxidative stress markers, AOA, and oxidizedreduced vitamin C ratio were gradually returned to normal, while there was no apparent change of total vitamin C concentrations. Persistently high values of oxidized/reduced vitamin C ratio and serum MDA were found in subacute OM. In conclusion, acute OM was associated with enhanced systemic oxidative stress and the shift of vitamin C redox status towards oxidized forms.
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Beckmann R, Tohidnezhad M, Lichte P, Wruck C, Jahr H, Pape H, Pufe T. Aus alt mach neu. DER ORTHOPADE 2014; 43:298-305. [DOI: 10.1007/s00132-013-2160-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Fallah A, Pierre R, Abed E, Moreau R. Lysophosphatidylcholine-induced cytotoxicity in osteoblast-like MG-63 cells: involvement of transient receptor potential vanilloid 2 (TRPV2) channels. Mol Membr Biol 2014; 30:315-26. [PMID: 23964684 DOI: 10.3109/09687688.2013.828855] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Epidemiological studies indicate that patients suffering from atherosclerosis are predisposed to develop osteoporosis. Accordingly, atherogenic determinants such as oxidized low density lipoprotein (OxLDL) particles have been shown to alter bone cell functions. In this work, we investigated the cytotoxicity of lysophosphatidylcholine (lysoPC), a major phospholipid component generated upon LDL oxidation, on bone-forming MG-63 osteoblast-like cells. Cell viability was reduced by lysoPC in a concentration-dependent manner with a LC50 of 18.7±0.7 μM. LysoPC-induced cell death was attributed to induction of both apoptosis and necrosis. Since impairment of intracellular calcium homeostasis is often involved in mechanism of cell death, we determined the involvement of calcium in lysoPC-induced cytotoxicity. LysoPC promoted a rapid and transient increase in intracellular calcium attributed to mobilization from calcium stores, followed by a sustained influx. Intracellular calcium mobilization was associated to phospholipase C (PLC)-dependent mobilization of calcium from the endoplasmic reticulum since inhibition of PLC or calcium depletion of reticulum endoplasmic with thapsigargin prevented the calcium mobilization. The calcium influx induced by lysoPC was abolished by inhibition of transient receptor potential vanilloid (TRPV) channels with ruthenium red whereas gadolinium, which inhibits canonical TRP (TRPC) channels, was without effect. Accordingly, expression of TRPV2 and TRPV4 were shown in MG-63 cells. The addition of TRPV2 inhibitor Tranilast in the incubation medium prevent the calcium influx triggered by lysoPC and reduced lysoPC-induced cytotoxicity whereas TRPV4 inhibitor RN 1734 was without effect, which confirms the involvement of TRPV2 activation in lysoPC-induced cell death.
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Affiliation(s)
- Abdallah Fallah
- Laboratoire du Métabolisme Osseux, BIOMED, Département des Sciences Biologiques, Université du Québec à Montréal, Montreal, Quebec, Canada
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Tintut Y, Demer LL. Effects of bioactive lipids and lipoproteins on bone. Trends Endocrinol Metab 2014; 25:53-9. [PMID: 24183940 PMCID: PMC3946677 DOI: 10.1016/j.tem.2013.10.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 09/30/2013] [Accepted: 10/02/2013] [Indexed: 12/11/2022]
Abstract
Although epidemiological studies from the past two decades show a link between atherosclerotic vascular disease and bone loss, that is independent of age, the mechanism is still unclear. This review focuses on evidence that suggests a role for atherogenic lipids and lipoproteins in the pathogenesis of bone loss, including direct effects of these bioactive lipids/lipoproteins on bone cells, inhibiting osteoblastic differentiation and promoting osteoclastic differentiation. It also addresses recent evidence that suggests that bioactive lipids blunt the effects of bone anabolic agents such as teriparatide and bone morphogenetic proteins. Systemic and intracellular oxidant stress and inflammation are implicated in mediating the effects of bioactive lipids/lipoproteins.
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Affiliation(s)
- Yin Tintut
- Division of Cardiology, Department of Medicine, University of California, Los Angeles, CA 90095, USA.
| | - Linda L Demer
- Division of Cardiology, Department of Medicine, University of California, Los Angeles, CA 90095, USA; Department of Physiology, University of California, Los Angeles, CA 90095, USA; Department of Bioengineering, University of California, Los Angeles, CA 90095, USA
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Keuroghlian A, Barroso ADV, Kirikian G, Bezouglaia O, Tintut Y, Tetradis S, Moy P, Pirih F, Aghaloo T. The effects of hyperlipidemia on implant osseointegration in the mouse femur. J ORAL IMPLANTOL 2013; 41:e7-e11. [PMID: 24295508 DOI: 10.1563/aaid-joi-d-13-00105] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A high-fat (HF) diet inducing hyperlipidemia has been associated with the pathophysiology of major diseases, such as atherosclerosis and osteoporosis. A HF diet has significant adverse effects on bone, including lower bone density, volume, and strength. Statins, drugs that lower serum cholesterol levels have beneficial effects on bone metabolism. Since the host's bone quantity, quality, and healing potential play a crucial role in osseointegration of dental implants, we hypothesized that hyperlipidemia may negatively affect implant osseointegration. In the present study, we evaluated the effects of hyperlipidemia on implant osseointegration in mice. Atherosclerosis susceptible C57BL/6J male mice were randomly placed on a control chow or a HF diet. After 12 weeks on the diet, each mouse received a titanium implant in the proximal metaphysis of the femur. The animals were humanely killed at 4 or 8 weeks after the implant surgery. Results showed that the mice fed a HF diet had significantly increased implant loss as well as decreased formation and strength of bone-to-implant interface. These results support the hypothesis that a HF diet can significantly compromise osseointegration, causing poor outcome in dental implant therapy.
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Almeida M, O'Brien CA. Basic biology of skeletal aging: role of stress response pathways. J Gerontol A Biol Sci Med Sci 2013; 68:1197-208. [PMID: 23825036 DOI: 10.1093/gerona/glt079] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Although a decline in bone formation and loss of bone mass are common features of human aging, the molecular mechanisms mediating these effects have remained unclear. Evidence from pharmacological and genetic studies in mice has provided support for a deleterious effect of oxidative stress in bone and has strengthened the idea that an increase in reactive oxygen species (ROS) with advancing age represents a pathophysiological mechanism underlying age-related bone loss. Mesenchymal stem cells and osteocytes are long-lived cells and, therefore, are more susceptible than other types of bone cells to the molecular changes caused by aging, including increased levels of ROS and decreased autophagy. However, short-lived cells like osteoblast progenitors and mature osteoblasts and osteoclasts are also affected by the altered aged environment characterized by lower levels of sex steroids, increased endogenous glucocorticoids, and higher oxidized lipids. This article reviews current knowledge on the effects of the aging process on bone, with particular emphasis on the role of ROS and autophagy in cells of the osteoblast lineage in mice.
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Affiliation(s)
- Maria Almeida
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, AR 72205.
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Mazière C, Salle V, Gomila C, Mazière JC. Oxidized low density lipoprotein enhanced RANKL expression in human osteoblast-like cells. Involvement of ERK, NFkappaB and NFAT. Biochim Biophys Acta Mol Basis Dis 2013; 1832:1756-64. [PMID: 23756197 DOI: 10.1016/j.bbadis.2013.05.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 04/29/2013] [Accepted: 05/31/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand/osteoprotegerin ratio is of crucial importance in osteoclast differentiation and thus in bone dysregulation diseases. METHODS Receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand and osteoprotegerin were determined under oxidized low density lipoprotein treatment of human osteoblast-like cells. The involvement of oxidative stress, of the extracellular signal regulated kinase and of the transcription factors nuclear factor kappa-light-chain-enhancer of activated B cells and nuclear factor of activated T cells was demonstrated. RESULTS Cu(2+)-oxidized low density lipoprotein increased cell-associated and extracellular receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand levels whereas osteoprotegerin levels were not affected. The increase in receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand was parallel to the generation of reactive oxygen species provoked by Cu(2+)-oxidized low density lipoprotein. The lipid extract of Cu(2+)-oxidized low density lipoprotein, together with other forms of oxidized low density lipoproteins such as smooth muscle cell-oxidized low density lipoprotein and myeloperoxidase-oxidized low density lipoprotein, also induced an increase in reactive oxygen species and cell-associated receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand. The effect of Cu(2+)-oxidized low density lipoprotein was prevented by the antioxidant vitamin E, and mimicked by the prooxidant compounds hydrogen peroxide and buthionine sulfoximine. Inhibitors of mitogen activated protein kinase/extracellular signal regulated kinase (PD 98059), nuclear factor kappa-light-chain-enhancer of activated B cells (Ro 106-9920) and nuclear factor of activated T cells (Vivit) reduced the effect of Cu(2+)-oxidized low density lipoprotein on receptor activator of nuclear factor kappa-light-chain-enhancer of activated B cell ligand expression. Cu(2+)-oxidized low density lipoprotein signaling was also reduced by vitamin E. GENERAL SIGNIFICANCE This work describes a new molecular mechanism and elucidates the signaling pathway whereby oxidized low density lipoprotein, by means of its lipid moiety, can modulate the crosstalk between osteoblasts/osteoclasts and bone remodeling, leading to an eventual risk of osteoporosis.
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Lu J, Cheng H, Atti E, Shih DM, Demer LL, Tintut Y. Role of paraoxonase-1 in bone anabolic effects of parathyroid hormone in hyperlipidemic mice. Biochem Biophys Res Commun 2013; 431:19-24. [PMID: 23291186 DOI: 10.1016/j.bbrc.2012.12.114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 12/17/2012] [Indexed: 11/15/2022]
Abstract
Hyperlipidemia blunts anabolic effects of intermittent parathyroid hormone (PTH) on cortical bone, and the responsiveness to PTH are restored in part by oral administration of the antioxidant ApoA-I mimetic peptide, D-4F. To evaluate the mechanism of this rescue, hyperlipidemic mice overexpressing the high-density lipoprotein-associated antioxidant enzyme, paraoxonase 1 (Ldlr(-/-)PON1(tg)) were generated, and daily PTH injections were administered to Ldlr(-/-)PON1(tg) and to littermate Ldlr(-/-) mice. Expression of bone regulatory genes was determined by realtime RT-qPCR, and cortical bone parameters of the femoral bones by micro-computed tomographic analyses. PTH-treated Ldlr(-/-)PON1(tg) mice had significantly greater expression of PTH receptor (PTH1R), activating transcription factor-4 (ATF4), and osteoprotegerin (OPG) in femoral cortical bone, as well as significantly greater cortical bone mineral content, thickness, and area in femoral diaphyses compared with untreated Ldlr(-/-)PON1(tg) mice. In contrast, in control mice (Ldlr(-/-)) without PON1 overexpression, PTH treatment did not induce these markers. Calvarial bone of PTH-treated Ldlr(-/-)PON1(tg) mice also had significantly greater expression of osteoblastic differentiation marker genes as well as BMP-2-target and Wnt-target genes. Untreated Ldlr(-/-)PON1(tg) mice had significantly greater expression of PTHR1 than untreated Ldlr(-/-) mice, whereas sclerostin expression was reduced. In femoral cortical bones, expression levels of transcription factors, FoxO1 and ATF4, were also elevated in the untreated, control Ldlr(-/-)PON1(tg) mice, suggesting enhancement of cellular protection against oxidants. These findings suggest that PON1 restores responsiveness to PTH through effects on oxidant stress, PTH receptor expression, and/or Wnt signaling.
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Affiliation(s)
- Jinxiu Lu
- Department of Physiology, University of California, Los Angeles, CA 90095-1679, United States
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39
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Figueiredo CP, Rajamannan NM, Lopes JB, Caparbo VF, Takayama L, Kuroishi ME, Oliveira IS, Menezes PR, Scazufca M, Bonfá E, Pereira RMR. Serum phosphate and hip bone mineral density as additional factors for high vascular calcification scores in a community-dwelling: the São Paulo Ageing & Health Study (SPAH). Bone 2013; 52:354-9. [PMID: 23098828 DOI: 10.1016/j.bone.2012.10.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 10/14/2012] [Accepted: 10/17/2012] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To analyze the association between abdominal aortic calcification scores (AACS) and bone metabolism parameters in a well-characterized general population of older adults. BACKGROUND Several studies suggest a link between bone mineral metabolism disorders and vascular calcification; although only few of them analyze bone mineral density(BMD), laboratory bone markers and cardiovascular parameters at the same time and none were done in a miscegenated population. METHODS This cross-sectional study included 815 subjects ≥ 65 years old. The risk factors for osteoporosis and cardiovascular disease as well as a wide array of demographic and lifestyle characteristics were collected using a standardized questionnaire. BMD was measured by DXA. Kauppila's method was used to quantify the AAC score (AACS) by spine X-rays. Laboratory analyses were also performed. RESULTS AAC was observed in 63.2% of subjects with a median AACS of 2 (IQR: 0-7). AACS were categorized in quartiles and the highest quartile of AACS (>7) were compared with the three lower quartiles of AACS (≤ 7). Logistic regression analysis was performed using parameters with statistical significance in the univariate analysis. The best logistic regression model revealed that AACS>7 was negatively associated with femoral neck BMD and positively associated with phosphorus, adjusted by age, current smoking, LDL, and arterial hypertension in the elderly community-dwelling population. CONCLUSIONS We identified that higher serum phosphate levels and lower hip BMD are independent bone variables that are associated with elevated vascular calcification scores, supporting the search for effective prevention and treatment strategies that may simultaneously reduce these modifiable risk factors in older subjects.
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Affiliation(s)
- Camille P Figueiredo
- Bone Metabolism Laboratory, Rheumatology Division, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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Abstract
Advancing age and loss of bone mass and strength are closely linked. Elevated osteoblast and osteocyte apoptosis and decreased osteoblast number characterize the age-related skeletal changes in humans and rodents. Similar to other tissues, oxidative stress increases in bone with age. This article reviews current knowledge on the effects of the aging process on bone and its cellular constituents, with particular emphasis on the role of reactive oxygen species (ROS). FoxOs, sirtuins and the p53/p66shc signaling cascade alter osteoblast number and bone formation via ROS-dependent and -independent mechanisms. Specifically, activation of the p53/p66shc signaling increases osteoblast/osteocyte apoptosis in the aged skeleton and decreases bone mass. FoxO activation in osteoblasts prevents oxidative stress to preserve skeletal homeostasis. However, while defending against stress FoxOs bind to β-catenin and attenuate Wnt/T-cell cell factor transcriptional activity and osteoblast generation. Thus, pathways that impact longevity and several diseases of ageing might also contribute to age-related osteoporosis.
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Affiliation(s)
- Maria Almeida
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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Portal-Núñez S, Lozano D, de la Fuente M, Esbrit P. [Pathophysiology of aging bone]. Rev Esp Geriatr Gerontol 2012; 47:125-131. [PMID: 22172573 DOI: 10.1016/j.regg.2011.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/25/2011] [Accepted: 09/01/2011] [Indexed: 05/31/2023]
Abstract
Deterioration of organ and systems function are the principal signs of aging. Aging is also believed to be a major factor in the loss of bone mass and quality, which in turn leads to an increase in the risk of fractures. Several factors seem to contribute to this scenario, with metabolic changes related to aging in the bone tissue itself being among them. Most of the current knowledge on the mechanisms associated with osteopenia/osteoporosis during aging has been generated from research in animal models (mainly rats and mice) and cell cultures derived from subjects of different ages. In this work, we have reviewed and summarised these studies, which have begun to establish the physiological and molecular basis of the bone alterations related to aging.
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Affiliation(s)
- Sergio Portal-Núñez
- Laboratorio de Metabolismo Mineral y Óseo, Instituto de Investigación Sanitaria-Fundación Jiménez Díaz, Madrid, España.
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Pirih F, Lu J, Ye F, Bezouglaia O, Atti E, Ascenzi MG, Tetradis S, Demer L, Aghaloo T, Tintut Y. Adverse effects of hyperlipidemia on bone regeneration and strength. J Bone Miner Res 2012; 27:309-18. [PMID: 21987408 PMCID: PMC3274629 DOI: 10.1002/jbmr.541] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Hyperlipidemia increases the risk for generation of lipid oxidation products, which accumulate in the subendothelial spaces of vasculature and bone. Atherogenic high-fat diets increase serum levels of oxidized lipids, which are known to attenuate osteogenesis in culture and to promote bone loss in mice. In this study, we investigated whether oxidized lipids affect bone regeneration and mechanical strength. Wild-type (WT) and hyperlipidemic (Ldlr(-/-)) mice were placed on a high-fat (HF) diet for 13 weeks. Bilateral cranial defects were introduced on each side of the sagittal suture, and 5 weeks postsurgery on the respective diets, the repair/regeneration of cranial bones and mechanical properties of femoral bones were assessed. MicroCT and histological analyses demonstrated that bone regeneration was significantly impaired by the HF diet in WT and Ldlr(-/-) mice. In femoral bone, cortical bone volume fraction (bone volume [BV]/tissue volume [TV]) was significantly reduced, whereas cortical porosity was increased by the HF diet in Ldlr(-/-) but not in WT mice. Femoral bone strength and stiffness, measured by three-point bending analysis, were significantly reduced by the HF diet in Ldlr(-/-), but not in WT mice. Serum analysis showed that the HF diet significantly increased levels of parathyroid hormone, tumor necrosis factor (TNF)-α, calcium, and phosphorus, whereas it reduced procollagen type I N-terminal propeptide, a serum marker of bone formation, in Ldlr(-/-), but not in WT mice. The serum level of carboxyl-terminal collagen crosslinks, a marker for bone resorption, was also 1.7-fold greater in Ldlr(-/-) mice. These findings suggest that hyperlipidemia induces secondary hyperparathyroidism and impairs bone regeneration and mechanical strength.
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Affiliation(s)
- Flavia Pirih
- Division of Diagnostic and Surgical Sciences, School of Dentistry, University of California, Los Angeles, Los Angeles, CA, USA
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Demer L, Tintut Y. The roles of lipid oxidation products and receptor activator of nuclear factor-κB signaling in atherosclerotic calcification. Circ Res 2011; 108:1482-93. [PMID: 21659652 DOI: 10.1161/circresaha.110.234245] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review focuses on the roles of oxylipids and receptor activator of nuclear factor-κB ligand signaling in calcific cardiovascular disease. Both intimal and valvular calcifications are closely associated with atherosclerosis, leading investigators to study the role of atherogenic oxidatively modified lipids (oxylipids). Results have identified the molecular signaling through which oxylipids induce osteogenic differentiation and calcification in vascular cells. A surprising concomitant finding was that, in bona fide osteoblasts from skeletal bone, oxylipids have the opposite effect, ie, inhibiting osteoblastic maturation. This is the basis for the lipid hypothesis of osteoporosis. Oxylipids also induce resorptive osteoclastic cells within the bone environment, raising the question of whether resorptive osteoclasts can be harnessed in the vascular context for cell-based therapy to remove artery wall mineral deposits. The challenge is that vascular cells produce antiosteoclastogenic factors, including the soluble decoy receptor for receptor activator of nuclear factor-κB ligand, possibly accounting for the paucity of resorptive cells and the dominance of mineral in atherosclerotic plaque. These factors may have therapeutic use in osteoclastogenic removal of mineral deposits from arteries.
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Affiliation(s)
- Linda Demer
- Department of Medicine, University of California, Los Angeles, CA, USA.
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Sage AP, Lu J, Atti E, Tetradis S, Ascenzi MG, Adams DJ, Demer LL, Tintut Y. Hyperlipidemia induces resistance to PTH bone anabolism in mice via oxidized lipids. J Bone Miner Res 2011; 26:1197-206. [PMID: 21611962 PMCID: PMC3312754 DOI: 10.1002/jbmr.312] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In hyperlipidemia, oxidized lipids accumulate in vascular tissues and trigger atherosclerosis. Such lipids also deposit in bone tissues, where they may promote osteoporosis. We found previously that oxidized lipids attenuate osteogenesis and that parathyroid hormone (PTH) bone anabolism is blunted in hyperlipidemic mice, suggesting that osteoporotic patients with hyperlipidemia may develop resistance to PTH therapy. To determine if oxidized lipids account for this PTH resistance, we blocked lipid oxidation products in hyperlipidemic mice with an ApoA-I mimetic peptide, D-4F, and the bone anabolic response to PTH treatment was assessed. Skeletally immature Ldlr(-/-) mice were placed on a high-fat diet and treated with D-4F peptide and/or with intermittent PTH(1-34) injections. As expected, D-4F attenuated serum lipid oxidation products and tissue lipid deposition induced by the diet. Importantly, D-4F treatment attenuated the adverse effects of dietary hyperlipidemia on PTH anabolism by restoring micro-computed tomographic parameters of bone quality-cortical mineral content, area, and thickness. D-4F significantly reduced serum markers of bone resorption but not bone formation. PTH and D-4F, together but not separately, also promoted bone anabolism in an alternative model of hyperlipidemia, Apoe(-/-) mice. In normolipemic mice, D-4F cotreatment did not further enhance the anabolic effects of PTH, indicating that the mechanism is through its effects on lipids. These findings suggest that oxidized lipids mediate hyperlipidemia-induced PTH resistance in bone through modulation of bone resorption.
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Affiliation(s)
- Andrew P Sage
- Division of Cardiology, Department of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1679, USA
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Li AT, Zhang JD, Yu HL, Pan J, Xu JH. Significantly improved asymmetric oxidation of sulfide with resting cells of Rhodococcus sp. in a biphasic system. Process Biochem 2011. [DOI: 10.1016/j.procbio.2010.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gieseg SP, Amit Z, Yang YT, Shchepetkina A, Katouah H. Oxidant production, oxLDL uptake, and CD36 levels in human monocyte–derived macrophages are downregulated by the macrophage-generated antioxidant 7,8-dihydroneopterin. Antioxid Redox Signal 2010; 13:1525-34. [PMID: 20408759 DOI: 10.1089/ars.2009.3065] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The severity of atheroma burden in patients strongly correlates to increasing levels of plasma neopterin, the oxidation product of 7,8-dihydroneopterin. Interferon-γ stimulation of macrophages causes the synthesis of 7,8-dihydroneopterin, a potent antioxidant that inhibits oxidative damage to cells, and the cytotoxicity of oxidized low-density lipoprotein (oxLDL) to monocyte-like U937 cells but not THP-1 cells. With human monocyte-derived macrophages (HMDMs), oxLDL triggered a large oxidative stress, causing the rapid loss of cellular glutathione, glyceradehyde-3-phosphate dehydrogenase (GAPDH) inhibition, and eventual loss of viability without caspase-3 activation. Inhibition of oxLDL cytotoxicity to HMDMs occurred at 7,8-dihydroneopterin concentrations >100 μM. The oxLDL-mediated glutathione loss and GAPDH inactivation was inhibited by 7,8-dihydroneopterin. 7,8-Dihydroneopterin rapidly entered the HMDMs, suggesting that much of the protective effect was scavenging of intracellular oxidants generated in response to oxLDL. OxLDL uptake by HMDMs was reduced by 30% by 7,8-dihydroneopterin. Immunoblot analysis suggests that this decrease in oxLDL uptake was due to a significant downregulation in the levels of CD36. These results imply that 7,8-dihydroneopterin protects human macrophages both by scavenging oxidants generated in response to oxLDL and by decreasing CD36-mediated uptake of oxLDL.
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Affiliation(s)
- Steven P Gieseg
- Free Radical Biochemistry Laboratory, School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.
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Oxidized low density lipoprotein inhibits phosphate signaling and phosphate-induced mineralization in osteoblasts. Involvement of oxidative stress. Biochim Biophys Acta Mol Basis Dis 2010; 1802:1013-9. [PMID: 20667472 DOI: 10.1016/j.bbadis.2010.07.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 07/07/2010] [Accepted: 07/13/2010] [Indexed: 01/01/2023]
Abstract
BACKGROUND It is well admitted that oxidized LDL (OxLDL) plays a major role in the generation and progression of atherosclerosis. Since atherosclerosis is often accompanied by osteoporosis, the effects of OxLDL on phosphate-induced osteoblast mineralization were investigated. METHODS Calcium deposition, expression of osteoblast markers and inorganic phosphate (Pi) signaling were determined under OxLDL treatment. RESULTS OxLDL, within the range of 10-50 μg protein/ml, inhibited Pi-induced UMR106 rat osteoblast mineralization. In parallel, the expression of Cbfa1/Runx2 transcription factor was decreased, and the intracellular level of the osteoblast marker osteopontin (OPN) was reduced. The extracellular level of another marker, receptor activator of nuclear factor kappa B ligand (RANKL), was also diminished. OxLDL inhibited Pi signaling via ERK/JNK kinases and AP1/CREB transcription factors. OxLDL triggered the generation of reactive oxygen species (ROS), either in the absence or presence of Pi. Furthermore, the effects of OxLDL on Pi-induced mineralization, generation of ROS and extracellular level OPN were reproduced by the lipid extract of the particle, whereas the antioxidant vitamin E prevented them. CONCLUSIONS This work demonstrates that OxLDL, by generation of an oxidative stress, inhibits of Pi signaling and impairs Pi-induced osteoblast differentiation. GENERAL SIGNIFICANCE This highlights the role of OxLDL in bone remodeling and in degenerative disorders other than atherosclerosis, especially in osteoporosis.
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Tseng W, Lu J, Bishop GA, Watson AD, Sage AP, Demer L, Tintut Y. Regulation of interleukin-6 expression in osteoblasts by oxidized phospholipids. J Lipid Res 2009; 51:1010-6. [PMID: 19965598 DOI: 10.1194/jlr.m001099] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Epidemiological evidence suggests that cardiovascular disease is associated with osteoporosis, independent of age. Bone resorptive surface is increased in mice on a high-fat diet, and osteoclastic differentiation of bone marrow preosteoclasts is promoted by oxidized phospholipids. Because osteoclastic differentiation requires cytokines produced by osteoblasts, we hypothesized that the stimulatory mechanism of oxidized phospholipids is via induction of osteoclast-regulating cytokines in osteoblasts. To investigate the effects of oxidized phospholipids on expression of such cytokines, murine calvarial preosteoblasts, MC3T3-E1, were treated with oxidized 1-palmitoyl-2-arachidonyl-sn-glycero-3-phosphocholine (ox-PAPC), an active component of oxidized lipoproteins. Results showed that ox-PAPC increased expression of interleukin-6 (IL-6) and tumor necrosis factor-alpha. IL-6 expression was also elevated in calvarial tissues from hyperlipidemic but not in wild-type mice. Ox-PAPC also induced IL-6 protein levels in both MC3T3-E1 and primary calvarial cells. Promoter-reporter assay analysis showed that ox-PAPC, but not PAPC, induced murine IL-6 promoter activity. Effects of ox-PAPC on IL-6 expression and the promoter activity were attenuated by H89, a PKA inhibitor. Analysis of deletion and mutant IL-6 promoter constructs suggested that CAAT/enhancer binding protein (C/EBP) partly mediates the ox-PAPC effects. Taken together, the data suggest that oxidized phospholipids induce IL-6 expression in osteoblasts in part via C/EBP.
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Affiliation(s)
- Wendy Tseng
- Department of Physiological Science, University of California, Los Angeles, CA, USA
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Truong TQ, Brodeur MR, Falstrault L, Rhainds D, Brissette L. Expression of caveolin-1 in hepatic cells increases oxidized LDL uptake and preserves the expression of lipoprotein receptors. J Cell Biochem 2009; 108:906-15. [DOI: 10.1002/jcb.22321] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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