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Liu Z, Liu M, Xiong Y, Wang Y, Bu X. Crosstalk between bone and brain in Alzheimer's disease: Mechanisms, applications, and perspectives. Alzheimers Dement 2024; 20:5720-5739. [PMID: 38824621 PMCID: PMC11350061 DOI: 10.1002/alz.13864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 04/01/2024] [Accepted: 04/02/2024] [Indexed: 06/04/2024]
Abstract
Alzheimer's disease (AD) is a neurodegenerative disease that involves multiple systems in the body. Numerous recent studies have revealed bidirectional crosstalk between the brain and bone, but the interaction between bone and brain in AD remains unclear. In this review, we summarize human studies of the association between bone and brain and provide an overview of their interactions and the underlying mechanisms in AD. We review the effects of AD on bone from the aspects of AD pathogenic proteins, AD risk genes, neurohormones, neuropeptides, neurotransmitters, brain-derived extracellular vesicles (EVs), and the autonomic nervous system. Correspondingly, we elucidate the underlying mechanisms of the involvement of bone in the pathogenesis of AD, including bone-derived hormones, bone marrow-derived cells, bone-derived EVs, and inflammation. On the basis of the crosstalk between bone and the brain, we propose potential strategies for the management of AD with the hope of offering novel perspectives on its prevention and treatment. HIGHLIGHTS: The pathogenesis of AD, along with its consequent changes in the brain, may involve disturbing bone homeostasis. Degenerative bone disorders may influence the progression of AD through a series of pathophysiological mechanisms. Therefore, relevant bone intervention strategies may be beneficial for the comprehensive management of AD.
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Affiliation(s)
- Zhuo‐Ting Liu
- Department of Neurology and Centre for Clinical NeuroscienceDaping Hospital, State Key Laboratory of Trauma and Chemical Poisoning, Third Military Medical UniversityChongqingChina
- Chongqing Key Laboratory of Ageing and Brain DiseasesChongqingChina
- Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease (Third Military Medical University)ChongqingChina
| | - Ming‐Han Liu
- Department of OrthopaedicsXinqiao Hospital, Third Military Medical UniversityChongqingChina
| | - Yan Xiong
- Department of OrthopaedicsDaping Hospital, Third Military Medical UniversityChongqingChina
| | - Yan‐Jiang Wang
- Department of Neurology and Centre for Clinical NeuroscienceDaping Hospital, State Key Laboratory of Trauma and Chemical Poisoning, Third Military Medical UniversityChongqingChina
- Chongqing Key Laboratory of Ageing and Brain DiseasesChongqingChina
- Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease (Third Military Medical University)ChongqingChina
- Institute of Brain and IntelligenceThird Military Medical UniversityChongqingChina
| | - Xian‐Le Bu
- Department of Neurology and Centre for Clinical NeuroscienceDaping Hospital, State Key Laboratory of Trauma and Chemical Poisoning, Third Military Medical UniversityChongqingChina
- Chongqing Key Laboratory of Ageing and Brain DiseasesChongqingChina
- Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease (Third Military Medical University)ChongqingChina
- Institute of Brain and IntelligenceThird Military Medical UniversityChongqingChina
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Hou X, Tian F, Guo L, Yu Y, Hu Y, Chen S, Wang M, Yang Z, Wang J, Fan X, Xing L, Wu S, Zhang N. Remnant cholesterol is associated with hip BMD and low bone mass in young and middle-aged men: a cross-sectional study. J Endocrinol Invest 2024; 47:1657-1665. [PMID: 38183565 DOI: 10.1007/s40618-023-02279-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 12/08/2023] [Indexed: 01/08/2024]
Abstract
PURPOSE Remnant cholesterol (RC) is a contributor to cardiovascular diseases, obesity, diabetes, and metabolic syndrome. However, the specific relationship between RC and bone metabolism remains unexplored. Therefore, we aimed to investigate the relationships of RC with hip bone mineral density (BMD) and the risk of low bone mass. METHODS Physical examination data was collected from men aged < 60 years as part of the Kailuan Study between 2014 and 2018. The characteristics of the participants were compared between RC quartile groups. A generalized linear regression model was used to evaluate the relationship between RC and hip BMD and a logistic regression model was used to calculate odds ratios (ORs) and 95% confidence intervals (CIs) for low bone mass. Additional analyses were performed after stratification by body mass index (BMI) (≥ or < 24 kg/m2). Sensitivity analyses were performed by excluding individuals who were taking lipid-lowering therapy or had cancer, cardiovascular diseases, or diabetes. RESULTS Data from a total of 7,053 participants were included in the analysis. After adjustment for confounding factors, RC negatively correlated with hip BMD (β = - 0.0079, 95% CI: - 0.0133, - 0.0025). The risk of low bone mass increased from the lowest to the highest RC quartile, with ORs of 1 (reference), 1.09 (95% CI: (0.82, 1.44), 1.35 (95%CI: 1.02, 1.77), and 1.43 (95% CI: 1.09, 1.89) for Q1, Q2, Q3, and Q4, respectively (P for trend = 0.004) in the fully adjusted model. Compared to RC < 0.80 mmol/l group, the risk of low bone mass increased 39% in RC ≥ 0.80 mmol/l group (P < 0.001). The correlation between RC and hip BMD was stronger in participants with BMI ≥ 24 kg/m2 group (β = - 0.0159, 95% CI: - 0.0289, - 0.0029). The results of sensitivity analyses were consistent with the main results. CONCLUSION We have identified a negative correlation between serum RC and hip BMD, and a higher RC concentration was found to be associated with a greater risk of low bone mass in young and middle-aged men.
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Affiliation(s)
- X Hou
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - F Tian
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - L Guo
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - Y Yu
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - Y Hu
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - S Chen
- Kailuan General Hospital, Tangshan, People's Republic of China
| | - M Wang
- Beijing Jishuitan Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Z Yang
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - J Wang
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
| | - X Fan
- Kailuan General Hospital, Tangshan, People's Republic of China
| | - L Xing
- School of Public Health, North China University of Science and Technology, Tangshan, People's Republic of China
- Affiliated Hospital of North China University of Science and Technology, Tangshan, People's Republic of China
| | - S Wu
- Kailuan General Hospital, Tangshan, People's Republic of China.
| | - N Zhang
- Kailuan General Hospital, Tangshan, People's Republic of China.
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Xiao P, Wang Z, Lu Z, Liu S, Huang C, Xu Y, Tian Y. The association between remnant cholesterol and bone mineral density in US adults: the National Health and Nutrition Examination Survey (NHANES) 2013-2018. Lipids Health Dis 2024; 23:148. [PMID: 38762471 PMCID: PMC11102129 DOI: 10.1186/s12944-024-02145-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 05/13/2024] [Indexed: 05/20/2024] Open
Abstract
BACKGROUND Previous evidence showed a possible link of dyslipidemia with bone health. Nevertheless, the correlation of remnant cholesterol (RC) with bone mineral density (BMD) has yet to be well investigated. This study investigated the association of RC with total spine BMD in general Americans. METHODS This study explored the relationship of RC with total spine BMD in subjects aged ≥ 20 years from the National Health and Nutrition Examination Survey (NHANES) 2013-2018. After adjusting for covariates, multivariate linear regression and stratified analyses were conducted to determine the correlation of serum RC with total spine BMD in adult Americans. Restricted cubic spline (RCS) was applied to examine the nonlinear association of serum RC with total spine BMD. RESULTS This study included 3815 individuals ≥ 20 years old, 1905 (49.93%) of whom were men and 1910 (50.07%) of whom were women. After adjusting for all covariates, the results showed a negative relationship of serum RC with total spine BMD (β= -0.024, 95% CI: -0.039, -0.010). The interaction tests of age, sex, race, and BMI showed no statistically significant effects on the association. The RCS also indicated a negative linear correlation of serum RC with total spine BMD (nonlinear P = 0.068, overall P < 0.001). Moreover, RC had a stronger effect on total spine BMD than total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and high-density lipoprotein cholesterol (HDL-C). CONCLUSIONS This study found that serum RC was negatively related to total spine BMD in U.S. adults. These findings emphasized the important role of RC in bone health in American adults.
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Affiliation(s)
- Peilun Xiao
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Zhihang Wang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Zeyao Lu
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Shijia Liu
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Chongjun Huang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Ying Xu
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, China.
| | - Ye Tian
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, China.
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Iannotta D, A A, Lai A, Nair S, Koifman N, Lappas M, Salomon C, Wolfram J. Chemically-Induced Lipoprotein Breakdown for Improved Extracellular Vesicle Purification. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2307240. [PMID: 38100284 DOI: 10.1002/smll.202307240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 11/08/2023] [Indexed: 12/17/2023]
Abstract
Extracellular vesicles (EVs) are nanosized biomolecular packages involved in intercellular communication. EVs are released by all cells, making them broadly applicable as therapeutic, diagnostic, and mechanistic components in (patho)physiology. Sample purity is critical for correctly attributing observed effects to EVs and for maximizing therapeutic and diagnostic performance. Lipoprotein contaminants represent a major challenge for sample purity. Lipoproteins are approximately six orders of magnitude more abundant in the blood circulation and overlap in size, shape, and density with EVs. This study represents the first example of an EV purification method based on the chemically-induced breakdown of lipoproteins. Specifically, a styrene-maleic acid (SMA) copolymer is used to selectively breakdown lipoproteins, enabling subsequent size-based separation of the breakdown products from plasma EVs. The use of the polymer followed by tangential flow filtration or size-exclusion chromatography results in improved EV yield, preservation of EV morphology, increased EV markers, and reduced contaminant markers. SMA-based EV purification enables improved fluorescent labeling, reduces interactions with macrophages, and enhances accuracy, sensitivity, and specificity to detect EV biomarkers, indicating benefits for various downstream applications. In conclusion, SMA is a simple and effective method to improve the purity and yield of plasma-derived EVs, which favorably impacts downstream applications.
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Affiliation(s)
- Dalila Iannotta
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Amruta A
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Andrew Lai
- Translational Extracellular Vesicles in Obstetrics and Gynae-Oncology Group, Faculty of Medicine, University of Queensland Centre for Clinical Research, Royal Brisbane and Women's Hospital, The University of Queensland, Brisbane, QLD, 4029, Australia
| | - Soumyalekshmi Nair
- Translational Extracellular Vesicles in Obstetrics and Gynae-Oncology Group, Faculty of Medicine, University of Queensland Centre for Clinical Research, Royal Brisbane and Women's Hospital, The University of Queensland, Brisbane, QLD, 4029, Australia
| | - Na'ama Koifman
- Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Martha Lappas
- University of Melbourne, Department of Obstetrics and Gynaecology, Australia, and Mercy Hospital for Women, 163 Studley Road, Heidelberg, Victoria, 3084, Australia
| | - Carlos Salomon
- Translational Extracellular Vesicles in Obstetrics and Gynae-Oncology Group, Faculty of Medicine, University of Queensland Centre for Clinical Research, Royal Brisbane and Women's Hospital, The University of Queensland, Brisbane, QLD, 4029, Australia
| | - Joy Wolfram
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
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Liu W, Yang J, Li S, Ye X, Yang P, Zhang J. Hyperlipidemia impairs bone regeneration of closed bone defects and tooth extraction wounds in mice. J Periodontal Res 2023; 58:1201-1211. [PMID: 37587560 DOI: 10.1111/jre.13176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 07/08/2023] [Accepted: 08/04/2023] [Indexed: 08/18/2023]
Abstract
OBJECTIVES To evaluate the effect of hyperlipidemia on the healing of bone defects. MATERIALS AND METHODS Apolipoprotein E (ApoE)-deficient mice and wild-type (WT) C57BL/6J mice were fed with an atherogenic high-fat diet (HFD) or a standard chow diet (as control) for 6 weeks. Blood samples were collected to evaluate serum lipid levels. Closed bone defects and open tooth extraction wounds were then created in the mandibles of these animals. One or two weeks after surgery, animals were euthanized. Micro-CT analysis and histomorphometric analysis were conducted to evaluate the healing of bone defects and the alveolar ridge resorption. RESULTS Bone regeneration of closed bone defects was considerably delayed in the hyperlipidemic Apoe-/- mice and WT mice. No obvious difference was detected in the new bone formation of the tooth extraction wounds. The HFD-fed mice showed more prominent reduction in the lingual alveolar ridge height of the tooth extraction wounds when compared with the control group. CONCLUSIONS Hyperlipidemia results in delayed bone regeneration in large closed bone defects. Although tooth extraction wounds are small and normally regenerated in a hyperlipidemic microenvironment, the prominent reduction in the alveolar ridge height is also a challenge for future restoration of the dentition.
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Affiliation(s)
- Wenchuan Liu
- Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, China
| | - Jing Yang
- Department of Dentistry, People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, China
| | - Shanshan Li
- Dental Department, Huaihe Hospital of Henan University, Kaifeng, China
| | - Xin Ye
- Department of Endodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, China
| | - Pishan Yang
- Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, China
| | - Jin Zhang
- Department of Endodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, China
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Qi Q, Xu Y, Sun H, Zhou J, Li L, Pan X, Wang J, Cao W, Sun Y, Wang L. Apolipoprotein E deficiency attenuated osteogenesis via down-regulating osterix. Drug Discov Ther 2023; 17:270-278. [PMID: 37587051 DOI: 10.5582/ddt.2023.01026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Apolipoprotein E (ApoE), a ligand for low-density lipoprotein receptors, is strongly induced during osteogenesis and has a physiologic role in regulating osteoblast function, but the mechanisms of its action are still unclear. The study aims to elucidate the influence and molecular mechanisms of ApoE on bone formation. An ovariectomy-induced osteoporotic model were conducted in ApoE knockout (ApoE-/-) mice to study the effect of ApoE on the bone system. Bone quality were assessed through bone mineral density and histomorphometric analysis. To investigate the underlying role and mechanisms of ApoE during osteogenesis, primary osteoblasts from the calvariums of newborn ApoE-/- or wild-type (WT) mice were cultured in the osteoblastic differentiation medium in vitro for further research. Our animal experiment data showed that ApoE-/- mice exhibited bone loss, exacerbated by estrogen deprivation after ovariectomy. ApoE deficiency attenuated osteoblast activity and inhibited osteoblast osteogenesis, accompanied by decreased osterix expression. ApoE deficiency did not affect primary osteoblast viability and collagen-1 expression. Moreover, osteoprotegerin expression in ApoE-/- osteoblasts was reduced compared to WT controls. Our study demonstrated that ApoE gene deficiency contributed to bone loss and attenuated osteogenesis by down-regulating osterix expression.
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Affiliation(s)
- Qing Qi
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Yingping Xu
- Reproductive Medicine Center, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, Zhejiang, China
| | - Hongmei Sun
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Jing Zhou
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Lisha Li
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Xinyao Pan
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Jing Wang
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Wenli Cao
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, China
| | - Yan Sun
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
| | - Ling Wang
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
- The Academy of Integrative Medicine of Fudan University, Shanghai, China
- Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases, Shanghai, China
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Chang GRL, Cheng WY, Fan HC, Chen HL, Lan YW, Chen MS, Yen CC, Chen CM. Kefir peptides attenuate atherosclerotic vascular calcification and osteoporosis in atherogenic diet-fed ApoE−/− knockout mice. Front Cell Dev Biol 2023; 11:1158812. [PMID: 37091976 PMCID: PMC10117689 DOI: 10.3389/fcell.2023.1158812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 03/27/2023] [Indexed: 04/08/2023] Open
Abstract
Aims: Vascular calcification (VC) and osteoporosis were previously considered two distinct diseases. However, current understanding indicates that they share common pathogenetic mechanisms. The available medicines for treating VC and osteoporosis are limited. We previously demonstrated that kefir peptides (KPs) alleviated atherosclerosis in high-fat diet (HFD)-induced apolipoprotein E knockout (ApoE−/−) mice. The present study further addressed the preventive effects of KPs on VC and osteoporosis in ApoE−/− mice fed a high-cholesterol atherogenic diet (AD).Main methods: Seven-week-old ApoE−/− and wild-type C57BL/6 mice were randomly divided into five groups (n = 6). The development of VC and osteoporosis was evaluated after AD feeding for 13 weeks in KP-treated ApoE−/− mice and compared to C57BL/6 and ApoE−/− mice fed a standard chow diet (CD).Key findings: The results indicated that KP-treated ApoE−/− mice exhibited lower serum total cholesterol, oxidized low-density lipoprotein (ox-LDL), malondialdehyde (MDA) levels, and serum alanine aminotransferase (ALT), aspartate aminotransferase (AST) and creatine kinase (CK) activities, which suggested that KPs prevented hyperlipidemia and possible damages to the liver and muscle in ApoE−/− mice. KPs reduced serum tumor necrosis factor-α (TNF-α) and the local expression of TNF-α, IL-1β, and macrophage-specific CD68 markers in aortic tissues, which suggested that KPs inhibited inflammatory responses in AD-fed ApoE−/− mice. KPs reduced the deposition of lipid, collagen, and calcium minerals in the aortic roots of AD-fed ApoE−/− mice, which suggested that KPs inhibited the calcific progression of atherosclerotic plaques. KPs exerted osteoprotective effects in AD-fed ApoE−/− mice, which was evidenced by lower levels of the bone resorption marker CTX-1 and higher levels of the bone formation marker P1NP. KPs improved cortical bone mineral density and bone volume and reduced trabecular bone loss in femurs.Significance: The present data suggested that KPs attenuated VC and osteoporosis by reducing oxidative stress and inflammatory responses in AD-fed ApoE−/− mice. Our findings contribute to the application of KPs as preventive medicines for the treatment of hyperlipidemia-induced vascular and bone degeneration.
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Affiliation(s)
- Gary Ro-Lin Chang
- Department of Pediatrics, Department of Medical Research, Tungs’ Taichung Metroharbor Hospital, Taichung, Taiwan
- Department of Life Sciences, and Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Wei-Yuan Cheng
- Department of Life Sciences, and Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Hueng-Chuen Fan
- Department of Pediatrics, Department of Medical Research, Tungs’ Taichung Metroharbor Hospital, Taichung, Taiwan
- Department of Life Sciences, and Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung, Taiwan
- Department of Rehabilitation, Jen-Teh Junior College of Medicine, Miaoli, Taiwan
| | - Hsiao-Ling Chen
- Department of Biomedical Sciences, and Department of Bioresources, Da-Yeh University, Changhwa, Taiwan
| | - Ying-Wei Lan
- Department of Pediatrics, Department of Medical Research, Tungs’ Taichung Metroharbor Hospital, Taichung, Taiwan
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati, Cincinnati, OH, United States
| | - Ming-Shan Chen
- Department of Anesthesiology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
| | - Chih-Ching Yen
- Department of Internal Medicine, China Medical University Hospital, and College of Healthcare, China Medical University, Taichung, Taiwan
- *Correspondence: Chih-Ching Yen, ; Chuan-Mu Chen,
| | - Chuan-Mu Chen
- Department of Pediatrics, Department of Medical Research, Tungs’ Taichung Metroharbor Hospital, Taichung, Taiwan
- Department of Life Sciences, and Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung, Taiwan
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
- *Correspondence: Chih-Ching Yen, ; Chuan-Mu Chen,
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Wang YN, Yu L, Wang T, Liu S. Apolipoprotein E facilitates titanium implant osseointegration by regulating osteogenesis-lipogenesis balance. Int J Biol Macromol 2023; 236:123998. [PMID: 36906203 DOI: 10.1016/j.ijbiomac.2023.123998] [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: 01/28/2023] [Revised: 03/04/2023] [Accepted: 03/06/2023] [Indexed: 03/11/2023]
Abstract
Apolipoprotein E (ApoE), a protein closely related to various metabolic diseases, is recently considered to play an essential role in bone metabolism. However, the effect and mechanism of ApoE on implant osseointegration have not been clarified. This study aims to investigate the influence of additional ApoE supplementation in regulating the osteogenesis-lipogenesis balance on bone marrow mesenchymal stem cells (BMMSCs) cultured on titanium surface, and the effect of ApoE on the osseointegration of titanium implants. In vivo, the bone volume/total volume (BV/TV) and the bone-implant contact (BIC) significantly elevated in the exogenous supplement of ApoE group, compared with the Normal group. Meanwhile, the adipocyte area proportion around the implant dramatically decreased after 4-week healing. In vitro, the additional ApoE substantially drove the osteogenic differentiation of BMMSCs cultured on the titanium surface and inhibit their lipogenic differentiation as well as lipid droplet accumulation. These results suggest that ApoE, by mediating the differentiation of stem cells on the surface of titanium with this macromolecular protein, is deeply involved in facilitating titanium implant osseointegration, which reveals the potential mechanism and proposes a promising solution for further improving the osseointegration of titanium implants.
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Affiliation(s)
- Ya-Nan Wang
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, Shandong 250012, China
| | - Lu Yu
- Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, Shandong 250012, China
| | - Ting Wang
- Department of General Dentistry, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, Shandong 250012, China
| | - Shiyue Liu
- Department of Implantology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, Shandong 250012, China; Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, Shandong 250012, China.
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Alzheimer's Disease and Impaired Bone Microarchitecture, Regeneration and Potential Genetic Links. Life (Basel) 2023; 13:life13020373. [PMID: 36836731 PMCID: PMC9963274 DOI: 10.3390/life13020373] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/08/2023] [Accepted: 01/16/2023] [Indexed: 02/03/2023] Open
Abstract
Alzheimer's Disease (AD) and osteoporosis are both age-related degenerative diseases. Many studies indicate that these two diseases share common pathogenesis mechanisms. In this review, the osteoporotic phenotype of AD mouse models was discussed, and shared mechanisms such as hormonal imbalance, genetic factors, similar signaling pathways and impaired neurotransmitters were identified. Moreover, the review provides recent data associated with these two diseases. Furthermore, potential therapeutic approaches targeting both diseases were discussed. Thus, we proposed that preventing bone loss should be one of the most important treatment goals in patients with AD; treatment targeting brain disorders is also beneficial for osteoporosis.
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Park D, Kim DY, Byun MR, Hwang H, Ko SH, Baek JH, Baek K. Undercarboxylated, but not Carboxylated, Osteocalcin suppresses TNF-α induced inflammatory signaling pathway in Myoblast. J Endocr Soc 2022; 6:bvac084. [PMID: 35702666 PMCID: PMC9188654 DOI: 10.1210/jendso/bvac084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Indexed: 11/19/2022] Open
Abstract
Undercarboxylated osteocalcin (ucOCN) has been considered to be an important endocrine factor, especially to regulate bone and energy metabolism. Even with the mounting evidence showing the consistent inverse correlation of ucOCN levels in chronic inflammatory diseases, however, the mechanism underlying the involvement of ucOCN in the muscular inflammation has not been fully understood. In the present study, we explored 1) the endocrine role of ucOCN in the regulation of inflammation in C2C12 myoblasts and primary myoblasts and the underlying intracellular signaling mechanisms, and 2) whether G protein–coupled receptor family C group 6 member A (GPRC6A) is the ucOCN-sensing receptor associated with the ucOCN-mediated anti-inflammatory signaling pathway in myoblasts. ucOCN suppressed the tumor necrosis factor-α (TNF-α)–induced expressions of major inflammatory cytokines, including interleukin-1β (IL-1β) and inhibited the TNF-α–stimulated activities of transcription factors, including NF-κB, in C2C12 and primary myoblasts. Both knockdown and knockout of GPRC6A, by using siRNA or a CRISPR/CAS9 system, respectively, did not reverse the effect of ucOCN on IL-1β expression in myoblasts. Interestingly, TNF-α–induced IL-1β expression was inhibited by knockdown or deletion of GPRC6A itself, regardless of the ucOCN treatment. ucOCN was rapidly internalized into the cytoplasmic region via caveolae-mediated endocytosis, suggesting the presence of new target proteins in the cell membrane and/or in the cytoplasm for interaction with ucOCN in myoblasts. Taken together, these findings indicate that ucOCN suppresses the TNF-α–induced inflammatory signaling pathway in myoblasts. GPRC6A is not a sensing receptor associated with the ucOCN-mediated anti-inflammatory signaling pathway in myoblasts.
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Affiliation(s)
- Danbi Park
- Department of Pharmacology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University , Gangwondo 25457, Republic of Korea
| | - Do-Yeon Kim
- Department of Pharmacology, School of Dentistry, Kyungpook National University , Daegu 41940, Republic of Korea
| | - Mi Ran Byun
- Department of Pharmacology, College of Pharmacy, Kyung Hee University , Seoul 02447, Republic of Korea
| | - Hyorin Hwang
- Department of Pharmacology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University , Gangwondo 25457, Republic of Korea
| | - Seong Hee Ko
- Department of Pharmacology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University , Gangwondo 25457, Republic of Korea
| | - Jeong-Hwa Baek
- Department of Molecular Genetics, School of Dentistry and Dental Research Institute, Seoul National University , Seoul 08826, Republic of Korea
| | - Kyunghwa Baek
- Department of Pharmacology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University , Gangwondo 25457, Republic of Korea
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11
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Zhao H, Ji Q, Wu Z, Wang S, Ren J, Yan K, Wang Z, Hu J, Chu Q, Hu H, Cai Y, Wang Q, Huang D, Ji Z, Li J, Belmonte JCI, Song M, Zhang W, Qu J, Liu GH. Destabilizing heterochromatin by APOE mediates senescence. NATURE AGING 2022; 2:303-316. [PMID: 35368774 DOI: 10.1038/s43587-022-00186-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 02/01/2022] [Indexed: 04/30/2023]
Abstract
Apolipoprotein E (APOE) is a component of lipoprotein particles that function in the homeostasis of cholesterol and other lipids. Although APOE is genetically associated with human longevity and Alzheimer's disease, its mechanistic role in aging is largely unknown. Here, we used human genetic, stress-induced and physiological cellular aging models to explore APOE-driven processes in stem cell homeostasis and aging. We report that in aged human mesenchymal progenitor cells (MPCs), APOE accumulation is a driver for cellular senescence. By contrast, CRISPR-Cas9-mediated deletion of APOE endows human MPCs with resistance to cellular senescence. Mechanistically, we discovered that APOE functions as a destabilizer for heterochromatin. Specifically, increased APOE leads to the degradation of nuclear lamina proteins and a heterochromatin-associated protein KRAB-associated protein 1 via the autophagy-lysosomal pathway, thereby disrupting heterochromatin and causing senescence. Altogether, our findings uncover a role of APOE as an epigenetic mediator of senescence and provide potential targets to ameliorate aging-related diseases.
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Affiliation(s)
- Hongkai Zhao
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of Science and Technology of China, Hefei, China
| | - Qianzhao Ji
- University of the Chinese Academy of Sciences, Beijing, China
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Zeming Wu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Si Wang
- Advanced Innovation Center for Human Brain Protection, National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China
- Chongqing Renji Hospital, University of the Chinese Academy of Sciences, Chongqing, China
| | - Jie Ren
- University of the Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Chinese Academy of Sciences Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
- China National Center for Bioinformation, Beijing, China
| | - Kaowen Yan
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Zehua Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Jianli Hu
- University of the Chinese Academy of Sciences, Beijing, China
- Chinese Academy of Sciences Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
- China National Center for Bioinformation, Beijing, China
| | - Qun Chu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Huifang Hu
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Yusheng Cai
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Qiaoran Wang
- University of the Chinese Academy of Sciences, Beijing, China
- Chinese Academy of Sciences Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
- China National Center for Bioinformation, Beijing, China
| | - Daoyuan Huang
- Advanced Innovation Center for Human Brain Protection, National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Zhejun Ji
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | - Jingyi Li
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China
| | | | - Moshi Song
- University of the Chinese Academy of Sciences, Beijing, China.
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China.
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China.
| | - Weiqi Zhang
- University of the Chinese Academy of Sciences, Beijing, China.
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China.
- Chinese Academy of Sciences Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.
- China National Center for Bioinformation, Beijing, China.
| | - Jing Qu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
- University of Science and Technology of China, Hefei, China.
- University of the Chinese Academy of Sciences, Beijing, China.
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China.
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China.
| | - Guang-Hui Liu
- University of the Chinese Academy of Sciences, Beijing, China.
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China.
- Beijing Institute for Stem Cell and Regenerative Medicine, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China.
- Aging Translational Medicine Center, International Center for Aging and Cancer, Xuanwu Hospital, Capital Medical University, Beijing, China.
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Moxibustion attenuates inflammation and alleviates axial spondyloarthritis in mice: Possible role of APOE in the inhibition of the Wnt pathway. J Tradit Complement Med 2022; 12:518-528. [PMID: 36081820 PMCID: PMC9446098 DOI: 10.1016/j.jtcme.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 03/24/2022] [Accepted: 04/18/2022] [Indexed: 12/02/2022] Open
Abstract
Background and aim Moxibustion is widely used in China and other East Asian countries to manage the symptom of ankylosing spondylitis (AS). This study investigated the effects of moxibustion intervention on protein expression through proteomics analysis in AS mice. Experimental procedure Proteoglycan-induced spondylitis (PGISp) was established in Balb/c mice. PGISp mice were intervened with daily moxibustion at ST36, BL23, and DU4 for four weeks. Various biochemical (including pro-inflammatory cytokines and bone metabolism indexes) and histopathological parameters were determined. The effects of moxibustion on protein changes in AS mice were analyzed using data-independent acquisition-mass spectrometry (DIA-MS). The target proteins were then confirmed by Western blot analysis. Results Moxibustion significantly decreased pro-inflammatory cytokine expression including IL-1β, TNF-α, IL-17, and IL-6, reduced the mRNA expression of RANKL, RANK, ALP, and OCN, and improved the histopathological examination in AS mice. DIA-MS proteomic technique has identified 25 candidate proteins involved in the mechanisms of moxibustion for AS mice, most of which are mainly associated with the regulation of Wnt/β-catenin. Integrated pathway analysis revealed that glycine, serine and threonine metabolism together with lipid metabolism were the most important canonical pathways involved in the anti-AS effect of moxibustion. In line with the multi-omic data, the levels of BPGM, APOC2, APOE, and GPD1 modified in the AS mice, intervened with moxibustion as confirmed by Western blot. In particular, APOE may play a key role in linking the lipid metabolism and the Wnt/β-catenin pathway of new bone formation. Conclusion In conclusion, moxibustion may reduce pro-inflammatory cytokines and improve bone erosion for AS mice. The regulation of APOE by moxibustion may have a potential inhibitory effect on the Wnt/β-catenin pathway in AS mice. However, due to the lack of silencing or overexpression of key molecules of the signal pathway, whether the beneficial and positive effect of moxibustion involved in the regulation of Wnt/β-catenin signaling pathway by APOE or other aspects, needed to be explored in further study. Moxibustion reduced the levels of pro-inflammatory cytokine. Moxibustion alleviated bone erosion and prohibited the new bone formation. Moxibustion inhibited Wnt signaling pathway by APOE.
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Apolipoprotein E is an effective biomarker for orthodontic tooth movement in patients treated with transmission straight wire appliances. Am J Orthod Dentofacial Orthop 2021; 161:255-262.e1. [PMID: 34756485 DOI: 10.1016/j.ajodo.2020.08.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 08/01/2020] [Accepted: 08/01/2020] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Orthodontic tooth movement (OTM) is the core component of orthodontic treatment and is increasingly popular for treating malocclusions. In this study, we aimed to investigate the role of apolipoprotein E (ApoE) in OTM. METHODS Thirty patients treated with transmission straight wire technology were selected and longitudinally tracked at 2 different stages of orthodontic treatment (initial 2 months and 12 months of orthodontic treatment). Total saliva was collected and analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blotting was used to detect the difference in ApoE expression in the saliva samples of the 2 groups. The expression of ApoE was further verified by immunohistochemical staining in a mouse model of tooth movement. RESULTS The results of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry showed significant differences in the components of the salivary peptides in the 2 groups and peptides with a molecular weight of 2010.7 Da were predicted to be ApoE by database analysis. Western blotting further verified a significant difference in the expression of salivary ApoE in the 2 groups. In addition, an OTM model was successfully constructed in mice. The immunohistochemical staining results showed that ApoE expression significantly increased after force loading in the OTM model. CONCLUSIONS This study indicated that ApoE participated in and played a role during OTM in patients treated with transmission straight wire technology. This relationship might be related to alveolar bone reconstruction and root resorption. The results provide new ideas for research on the mechanism of tooth movement using precision medicine based on saliva detection.
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14
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Liu C, Ji X, Huang J, Wang Z, Liu Y, Hincke MT. Proteomics of Shell Matrix Proteins from the Cuttlefish Bone Reveals Unique Evolution for Cephalopod Biomineralization. ACS Biomater Sci Eng 2021; 9:1796-1807. [PMID: 34468131 DOI: 10.1021/acsbiomaterials.1c00693] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In contrast to the external shells in bivalves and gastropods, most cephalopods are missing this external protection. The cuttlefish, belonging to class cephalopod, has an internal biomineralized structure made of mainly calcium carbonate for controlling buoyancy. However, the macromolecules, especially proteins that control cuttlebone mineral formation, are not sufficiently understood, limiting our understanding of the evolution of this internal shell. In this study, we extracted proteins from the cuttlebone of pharaoh cuttlefish Sepia pharaonis and performed liquid chromatography-tandem mass spectrometry to identify the shell matrix proteins (SMPs). In total, 41 SMPs were identified. Among them, hemocyanin, an oxygen-carrying protein, was the most abundant SMP. By comparison with SMPs of other marine biominerals, hemocyanin, apolipophorin, soul domain proteins, transferrin, FL-rich, and enolase were found to be unique to the cuttlebone. In contrast, typical SMPs of external shells such as carbonic anhydrase complement control protein, fibronectin type III, and G/A-rich proteins were lacking from the cuttlebone. Furthermore, the cluster analysis of biomineral SMPs suggests that the SMP repertoire of the cuttlebone does not resemble that of other species with external shells. Taken together, this study implies a potential relationship of the cuttlefish internal shell with other internal biominerals, which highlights a unique shell evolutionary pathway in invertebrates.
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Affiliation(s)
- Chuang Liu
- College of Oceanography, Hohai University, Xikang Road, Nanjing, Jiangsu 210098, China
| | - Xin Ji
- College of Oceanography, Hohai University, Xikang Road, Nanjing, Jiangsu 210098, China
| | - Jingliang Huang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhu hai, Guangdong 519082, China
| | - Zilin Wang
- College of Oceanography, Hohai University, Xikang Road, Nanjing, Jiangsu 210098, China
| | - Yangjia Liu
- Central Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, China
| | - Maxwell T Hincke
- Department of Innovation in Medical Education, and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa K1H8M5, Ontario, Canada
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15
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Nicholson T, Scott A, Newton Ede M, Jones SW. The impact of E-cigarette vaping and vapour constituents on bone health. J Inflamm (Lond) 2021; 18:16. [PMID: 33952248 PMCID: PMC8097983 DOI: 10.1186/s12950-021-00283-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 04/25/2021] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND In contrast to cigarettes, electronic cigarette use (E-cigarettes) has grown substantially over the last decade. This is due to their promotion as both a safer alternative to cigarettes and as an aide to stop smoking. Critically, upon E-cigarette use, the user may be exposed to high doses of nicotine in addition to other compounds including flavouring chemicals, metal particulates and carbonyl compounds, particularly in highly vascularised tissues such as bone. However, there has been limited investigation into the impact of E-cigarette usage on bone physiology, particularly over extended time periods and there are no clinical recommendations regarding E-cigarette usage in relation to orthopaedic surgery. This literature review draws together data from studies that have investigated the impact of E-cigarette vapour and its major constituents on bone, detailing the models utilised and the relevant mechanistic and functional results. MAIN BODY Currently there is a lack of studies both in vivo and in vitro that have utilised E-cigarette vapour, necessary to account for changes in chemical composition of E-cigarette liquids upon vaping. There is however evidence that human bone and bone cells express nicotine receptors and exposure of both osteoblasts and osteoclasts to nicotine, in high concentrations may reduce their viability and impair function. Similarly, it appears that aldehydes and flavouring chemicals may also negatively impact osteoblast viability and their ability to form bone. However, such functional findings are predominantly the result of studies utilising bone cell lines such as MG-63 or Saos-2 cells, with limited use of human osteoblasts or osteoclasts. Additionally, there is limited consideration for a possible impact on mesenchymal stem cells, which can also play an import role in bone repair. CONCLUSION Understanding the function and mechanism of action of the various components of E-cigarette vapour in mediating human bone cell function, in addition to long term studies to determine the potential harm of chronic E-cigarette use on human bone will be important to inform users of potential risks, particularly regarding bone healing following orthopaedic surgery and injury.
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Affiliation(s)
- Thomas Nicholson
- grid.6572.60000 0004 1936 7486Institute of Inflammation and Ageing, MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, B15 2TT UK
| | - Aaron Scott
- grid.6572.60000 0004 1936 7486Institute of Inflammation and Ageing, MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, B15 2TT UK
| | - Matthew Newton Ede
- grid.416189.30000 0004 0425 5852The Royal Orthopaedic Hospital, Birmingham, B31 2AP UK
| | - Simon W. Jones
- grid.6572.60000 0004 1936 7486Institute of Inflammation and Ageing, MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, B15 2TT UK
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16
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Dadras M, May C, Wagner JM, Wallner C, Becerikli M, Dittfeld S, Serschnitzki B, Schilde L, Guntermann A, Sengstock C, Köller M, Seybold D, Geßmann J, Schildhauer TA, Lehnhardt M, Marcus K, Behr B. Comparative proteomic analysis of osteogenic differentiated human adipose tissue and bone marrow-derived stromal cells. J Cell Mol Med 2020; 24:11814-11827. [PMID: 32885592 PMCID: PMC7579700 DOI: 10.1111/jcmm.15797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 07/24/2020] [Accepted: 08/03/2020] [Indexed: 12/19/2022] Open
Abstract
Mesenchymal stromal cells are promising candidates for regenerative applications upon treatment of bone defects. Bone marrow‐derived stromal cells (BMSCs) are limited by yield and donor morbidity but show superior osteogenic capacity compared to adipose‐derived stromal cells (ASCs), which are highly abundant and easy to harvest. The underlying reasons for this difference on a proteomic level have not been studied yet. Human ASCs and BMSCs were characterized by FACS analysis and tri‐lineage differentiation, followed by an intraindividual comparative proteomic analysis upon osteogenic differentiation. Results of the proteomic analysis were followed by functional pathway analysis. 29 patients were included with a total of 58 specimen analysed. In these, out of 5148 identified proteins 2095 could be quantified in >80% of samples of both cell types, 427 in >80% of ASCs only and 102 in >80% of BMSCs only. 281 proteins were differentially regulated with a fold change of >1.5 of which 204 were higher abundant in BMSCs and 77 in ASCs. Integrin cell surface interactions were the most overrepresented pathway with 5 integrins being among the proteins with highest fold change. Integrin 11a, a known key protein for osteogenesis, could be identified as strongly up‐regulated in BMSC confirmed by Western blotting. The integrin expression profile is one of the key distinctive features of osteogenic differentiated BMSCs and ASCs. Thus, they represent a promising target for modifications of ASCs aiming to improve their osteogenic capacity and approximate them to that of BMSCs.
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Affiliation(s)
- Mehran Dadras
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Caroline May
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | | | - Christoph Wallner
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Mustafa Becerikli
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Stephanie Dittfeld
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | | | - Lukas Schilde
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Annika Guntermann
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Christina Sengstock
- Department of General and Trauma Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Manfred Köller
- Department of General and Trauma Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Dominik Seybold
- Department of General and Trauma Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Jan Geßmann
- Department of General and Trauma Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | | | - Marcus Lehnhardt
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
| | - Katrin Marcus
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Björn Behr
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Bochum, Germany
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17
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Yu RH, Zhang XY, Xu W, Li ZK, Zhu XD. Apolipoprotein D alleviates glucocorticoid-induced osteogenesis suppression in bone marrow mesenchymal stem cells via the PI3K/Akt pathway. J Orthop Surg Res 2020; 15:307. [PMID: 32771037 PMCID: PMC7414572 DOI: 10.1186/s13018-020-01824-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 07/29/2020] [Indexed: 02/07/2023] Open
Abstract
Background To clarify the role of apolipoprotein D (Apod) in alleviating glucocorticoid-induced osteogenesis suppression in bone marrow mesenchymal stem cells (MSCs) via the PI3K/Akt pathway, thus influencing the progression of osteoporosis (OP). Methods Osteogenesis in MSCs was induced by dexamethasone (DEX) stimulation. Dynamic expressions of Apod in MSCs undergoing osteogenesis for different time points were determined by qRT-PCR. Relative levels of osteogenesis-associated genes, including ALP, RUNX2, and Osterix, in DEX-induced MSCs overexpressing Apod or not were examined. Moreover, the protein level of RUNX2, ALP, and Osterix; ALP activity; and mineralization ability influenced by Apod in osteogenic MSCs were assessed. At last, the potential influences of Apod on the PI3K/Akt pathway were identified through detecting the expression levels of PI3K and Akt in MSCs by Western blot. Results Apod was time-dependently upregulated in MSCs undergoing osteogenesis. DEX induction downregulated ALP, RUNX2, and Osterix and attenuated ALP activity and mineralization ability in MSCs undergoing osteogenesis, which were partially reversed by overexpression of Apod. In addition, Apod overexpression upregulated the reduced levels of PI3K and Akt in DEX-induced MSCs. Conclusion Apod alleviates glucocorticoid-induced osteogenesis suppression in MSCs via the PI3K/Akt pathway, thus protecting the progression of OP.
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Affiliation(s)
- Rong-Hua Yu
- Department of Orthopedics, Tongren Hospital, School of Medicine, Shanghai JiaoTong University, 1111 Xianxia Road Shanghai, Shanghai, 200336, P.R. China
| | - Xiang-Yang Zhang
- Department of Orthopedics, Tongren Hospital, School of Medicine, Shanghai JiaoTong University, 1111 Xianxia Road Shanghai, Shanghai, 200336, P.R. China
| | - Wei Xu
- Department of Orthopedics, Tongren Hospital, School of Medicine, Shanghai JiaoTong University, 1111 Xianxia Road Shanghai, Shanghai, 200336, P.R. China
| | - Zhi-Kun Li
- Department of Orthopedics, Tongren Hospital, School of Medicine, Shanghai JiaoTong University, 1111 Xianxia Road Shanghai, Shanghai, 200336, P.R. China.
| | - Xiao-Dong Zhu
- Department of Orthopedics, Tongren Hospital, School of Medicine, Shanghai JiaoTong University, 1111 Xianxia Road Shanghai, Shanghai, 200336, P.R. China.
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E-vapor aerosols do not compromise bone integrity relative to cigarette smoke after 6-month inhalation in an ApoE -/- mouse model. Arch Toxicol 2020; 94:2163-2177. [PMID: 32409933 PMCID: PMC7303066 DOI: 10.1007/s00204-020-02769-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 04/30/2020] [Indexed: 12/12/2022]
Abstract
Cigarette smoke (CS) exposure is one of the leading risk factors for human health. Nicotine-containing inhalable products, such as e-cigarettes, can effectively support tobacco harm reduction approaches. However, there are limited comparative data on the effects of the aerosols generated from electronic vapor products (e-vapor) and CS on bone. Here, we report the effects of e-vapor aerosols and CS on bone morphology, structure, and strength in a 6-month inhalation study. Eight-week-old ApoE-/- mice were exposed to aerosols from three different e-vapor formulations-CARRIER (propylene glycol and vegetable glycerol), BASE (CARRIER and nicotine), TEST (BASE and flavor)-to CS from 3R4F reference cigarettes at matched nicotine concentrations (35 µg/L) or to fresh air (Sham) (N = 10 per group). Tibiae were analyzed for bone morphology by µCT imaging, biomechanics by three-point bending, and by histological analysis. CS inhalation caused a significant decrease in cortical and total bone volume fraction and bone density relative to e-vapor aerosols. Additionally, CS exposure caused a decrease in ultimate load and stiffness. In contrast, bone structural and biomechanical parameters were not significantly affected by e-vapor aerosol or Sham exposure. At the dissection time point, there was no significant difference in body weight or tibia bone weight or length among the groups. Histological findings revealed microcracks in cortical bone areas among all exposed groups compared to Sham control. In conclusion, because of the bone-preserving effect of e-vapor aerosols relative to CS exposure, e-vapor products could potentially constitute less harmful alternatives to cigarettes in situations in which bone health is of importance.
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19
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Chin KY, Chan CY, Subramaniam S, Muhammad N, Fairus A, Ng PY, Jamil NA, Aziz NA, Ima-Nirwana S, Mohamed N. Positive association between metabolic syndrome and bone mineral density among Malaysians. Int J Med Sci 2020; 17:2585-2593. [PMID: 33029101 PMCID: PMC7532478 DOI: 10.7150/ijms.49030] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/27/2020] [Indexed: 12/14/2022] Open
Abstract
Objectives: Metabolic syndrome (MetS) is a cluster of metabolic abnormalities that elevates the individual risk of cardiovascular diseases. These abnormalities are also known to alter bone remodelling. Therefore, MetS may be associated with osteoporosis. This study aims to determine the association between MetS and its components and bone mineral density (BMD) assessed by dual-energy X-ray absorptiometry (DXA) among Malaysians. Methods: 400 Malaysians aged ≥ 40 years (52.5% women) residing in Klang Valley, Malaysia, were recruited. Subjects' demographic and lifestyle details were collected using a questionnaire, and blood pressure and body anthropometry were measured. Subjects' lumbar spine and total hip BMD were measured by DXA. Their fasting blood was collected for blood glucose level and lipid profile analysis. Regression analysis was used to analyze the relationship between MetS or its components and BMD. Results: Subjects with MetS had higher BMD compared to subjects without MetS in models unadjusted for BMI (spine p=0.008; hip p<0.001). This difference was attenuated with BMI adjustment (spine p=0.625; hip p=0.478). Waist circumference was associated positively with BMD in models unadjusted for BMI (spine p=0.012; hip p<0.001), but the association became negative with BMI adjustment (spine p=0.044; hip p=0.021). Systolic blood pressure was associated positively with total hip BMD (p=0.019) but BMI adjustment attenuated the relationship (p=0.080). Triglyceride level was associated with osteoporosis in a fully adjusted model (p=0.001). Overall, MetS was associated with osteoporosis (p=0.019) but lifestyle (p=0.188) and BMI adjustment attenuated the relationship (p=0.904). Conclusion: MetS is positively associated with BMD, and this relationship is predominantly mediated by BMI. Although MetS is not a significant risk factor for osteoporosis, the inverse relationship between waist circumference, a marker of central obesity, and BMD highlights the need to prevent adiposity to improve metabolic and skeletal health.
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Affiliation(s)
- Kok-Yong Chin
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Chin Yi Chan
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Shaanthana Subramaniam
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Norliza Muhammad
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Ahmad Fairus
- Department of Anatomy, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Pei Yuen Ng
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia Kuala Lumpur Campus, Jalan Raja Muda Abdul Aziz, Kuala Lumpur 50300, Malaysia
| | - Nor Aini Jamil
- Centre for Community Health Studies (ReaCH), Faculty of Health Science, Universiti Kebangsaan Malaysia Kuala Lumpur Campus, Jalan Raja Muda Abdul Aziz, Kuala Lumpur 50300, Malaysia
| | - Noorazah Abd Aziz
- Department of Family Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Soelaiman Ima-Nirwana
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
| | - Norazlina Mohamed
- Department of Pharmacology, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Malaysia
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20
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Ascone G, Di Ceglie I, Walgreen B, Sloetjes AW, Lindhout E, Bot I, van de Loo FAJ, Koenders MI, van der Kraan PM, Blom AB, van den Bosch MHJ, van Lent PLEM. High LDL levels lessen bone destruction during antigen-induced arthritis by inhibiting osteoclast formation and function. Bone 2020; 130:115140. [PMID: 31712132 DOI: 10.1016/j.bone.2019.115140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 09/27/2019] [Accepted: 11/04/2019] [Indexed: 01/05/2023]
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disease, characterized by severe joint inflammation and bone destruction as the result of increased numbers and activity of osteoclasts. RA is often associated with metabolic syndrome, whereby elevated levels of LDL are oxidized into oxLDL, which might affect osteoclastogenesis. In this study, we induced antigen-induced arthritis (AIA) in Apoe-/- mice, which spontaneously develop high LDL levels, to investigate the effects of high LDL/oxLDL levels on osteoclast differentiation and bone destruction. Whereas basal levels of bone resorption were comparable between naive WT and Apoe-/- mice, induction of AIA resulted in a significant reduction of bone destruction in Apoe-/- mice as compared to WT controls. In line with that, the TRAP+ area on the cortical bone was significantly decreased. The absence of Apoe did affect neither the numbers of CD11b+Ly6Chigh and CD11b-/Ly6Chigh osteoclast precursors (OCPs) in the BM of naïve mice nor their in vitro osteoclastogenic potential as indicated by comparable mRNA expression of osteoclast markers. Addition of oxLDL, but not LDL, to pre-osteoclasts from day 3 and mature osteoclasts from day 6 of osteoclastogenesis strongly reduced the number of TRAP+ osteoclasts and their resorptive capacity. This coincided with a decreased expression of various osteoclast markers. Interestingly, oxLDL significantly lowered the expression of osteoclast-associated receptor (Oscar) and the DNAX adaptor protein-12 encoding gene Tyrobp, which regulate the immunoreceptor tyrosine-based activation motif (ITAM) co-stimulation pathway that is strongly involved in osteoclastogenesis. Collectively, our findings suggest that under inflammatory conditions in the joint, high LDL levels lessen bone destruction during AIA, probably by formation of oxLDL that inhibits osteoclast formation and activity through modulation of the ITAM-signaling.
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Affiliation(s)
- G Ascone
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - I Di Ceglie
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - B Walgreen
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - A W Sloetjes
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - E Lindhout
- Future Diagnostics Solutions (FDx), Wijchen, the Netherlands.
| | - I Bot
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden, the Netherlands.
| | - F A J van de Loo
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - M I Koenders
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - P M van der Kraan
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - A B Blom
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - M H J van den Bosch
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - P L E M van Lent
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
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21
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Abstract
Osteoblasts are specialized mesenchymal cells that synthesize bone matrix and coordinate the mineralization of the skeleton. These cells work in harmony with osteoclasts, which resorb bone, in a continuous cycle that occurs throughout life. The unique function of osteoblasts requires substantial amounts of energy production, particularly during states of new bone formation and remodelling. Over the last 15 years, studies have shown that osteoblasts secrete endocrine factors that integrate the metabolic requirements of bone formation with global energy balance through the regulation of insulin production, feeding behaviour and adipose tissue metabolism. In this article, we summarize the current understanding of three osteoblast-derived metabolic hormones (osteocalcin, lipocalin and sclerostin) and the clinical evidence that suggests the relevance of these pathways in humans, while also discussing the necessity of specific energy substrates (glucose, fatty acids and amino acids) to fuel bone formation and promote osteoblast differentiation.
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Affiliation(s)
- Naomi Dirckx
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Megan C Moorer
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
- The Baltimore Veterans Administration Medical Center, Baltimore, MD, USA
| | - Thomas L Clemens
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
- The Baltimore Veterans Administration Medical Center, Baltimore, MD, USA
| | - Ryan C Riddle
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- The Baltimore Veterans Administration Medical Center, Baltimore, MD, USA.
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22
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Huang R, Zong X, Nadesan P, Huebner JL, Kraus VB, White JP, White PJ, Baht GS. Lowering circulating apolipoprotein E levels improves aged bone fracture healing. JCI Insight 2019; 4:129144. [PMID: 31534056 DOI: 10.1172/jci.insight.129144] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 08/08/2019] [Indexed: 01/22/2023] Open
Abstract
Age is a well-established risk factor for impaired bone fracture healing. Here, we identify a role for apolipoprotein E (ApoE) in age-associated impairment of bone fracture healing and osteoblast differentiation, and we investigate the mechanism by which ApoE alters these processes. We identified that, in both humans and mice, circulating ApoE levels increase with age. We assessed bone healing in WT and ApoE-/- mice after performing tibial fracture surgery: bone deposition was higher within fracture calluses from ApoE-/- mice. In vitro recombinant ApoE (rApoE) treatment of differentiating osteoblasts decreased cellular differentiation and matrix mineralization. Moreover, this rApoE treatment decreased osteoblast glycolytic activity while increasing lipid uptake and fatty acid oxidation. Using parabiosis models, we determined that circulating ApoE plays a strong inhibitory role in bone repair. Using an adeno-associated virus-based siRNA system, we decreased circulating ApoE levels in 24-month-old mice and demonstrated that, as a result, fracture calluses from these aged mice displayed enhanced bone deposition and mechanical strength. Our results demonstrate that circulating ApoE as an aging factor inhibits bone fracture healing by altering osteoblast metabolism, thereby identifying ApoE as a new therapeutic target for improving bone repair in the elderly.
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Affiliation(s)
- Rong Huang
- Duke Molecular Physiology Institute.,Department of Orthopaedic Surgery
| | - Xiaohua Zong
- Duke Molecular Physiology Institute.,Department of Orthopaedic Surgery
| | | | | | - Virginia B Kraus
- Duke Molecular Physiology Institute.,Department of Orthopaedic Surgery.,Department of Pathology, and.,Department of Medicine, Duke University, Durham, North Carolina, USA
| | - James P White
- Duke Molecular Physiology Institute.,Department of Medicine, Duke University, Durham, North Carolina, USA
| | - Phillip J White
- Duke Molecular Physiology Institute.,Department of Medicine, Duke University, Durham, North Carolina, USA
| | - Gurpreet S Baht
- Duke Molecular Physiology Institute.,Department of Orthopaedic Surgery.,Department of Pathology, and
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23
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Identification of potential therapeutic targets of deer antler extract on bone regulation based on serum proteomic analysis. Mol Biol Rep 2019; 46:4861-4872. [DOI: 10.1007/s11033-019-04934-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Accepted: 06/20/2019] [Indexed: 12/23/2022]
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24
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Western-type diet differentially modulates osteoblast, osteoclast, and lipoblast differentiation and activation in a background of APOE deficiency. J Transl Med 2018; 98:1516-1526. [PMID: 30206314 DOI: 10.1038/s41374-018-0107-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 04/26/2018] [Accepted: 06/20/2018] [Indexed: 11/08/2022] Open
Abstract
During the past few years, considerable evidence has uncovered a strong relationship between fat and bone metabolism. Consequently, alterations in plasma lipid metabolic pathways strongly affect bone mass and quality. We recently showed that the deficiency of apolipoprotein A-1 (APOA1), a central regulator of high-density lipoprotein cholesterol (HDL-C) metabolism, results in reduced bone mass in C57BL/6 mice. It is documented that apolipoprotein E (APOE), a lipoprotein know for its atheroprotective functions and de novo biogenesis of HDL-C, is associated with the accumulation of fat in the liver and other organs and regulates bone mass in mice. We further studied the mechanism of APOE in bone metabolism using well-characterized APOE knockout mice. We found that bone mass was remarkably reduced in APOE deficient mice fed Western-type diet (WTD) compared to wild type counterparts. Static (microCT-based) and dynamic histomorphometry showed that the reduced bone mass in APOΕ-/- mice is attributed to both decreased osteoblastic bone synthesis and elevated osteoclastic bone resorption. Interestingly, histologic analysis of femoral sections revealed a significant reduction in the number of bone marrow lipoblasts in APOΕ-/- compared to wild type mice under WTD. Analyses of whole bone marrow cells obtained from femora of both animal groups showed that APOE null mice had significantly reduced levels of the osteoblastic (RUNX2 and Osterix) and lipoblastic (PPARγ and CEBPα) cardinal regulators. Additionally, the modulators of bone remodeling RANK, RANKL, and cathepsin K were greatly increased, while OPG and the OPG/RANKL ratio were remarkably decreased in APOΕ-/- mice fed WTD, compared to their wild-type counterparts. These findings suggest that APOE deficiency challenged with WTD reduces osteoblastic and lipoblastic differentiation and activity, whereas it enhances osteoclastic function, ultimately resulting in reduced bone mass, in mice.
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25
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Abstract
The emergence of bone as an endocrine organ able to influence whole body metabolism, together with comorbid epidemics of obesity, diabetes, and osteoporosis, have prompted a renewed interest in the intermediary metabolism of the osteoblast. To date, most studies have focused on the utilization of glucose by this specialized cell, but the oxidation of fatty acids results in a larger energy yield. Osteoblasts express the requisite receptors and catabolic enzymes to take up and then metabolize fatty acids, which appears to be required during later stages of differentiation when the osteoblast is dedicated to matrix production and mineralization. In this article, we provide an overview of fatty acid β-oxidation and highlight studies demonstrating that the skeleton plays a significant role in the clearance of circulating lipoproteins and non-esterified fatty acids. Additionally, we review the requirement for long-chain fatty acid metabolism during post-natal bone development and the effects of anabolic stimuli on fatty acid utilization by osteoblasts. These recent findings may help to explain the skeletal manifestations of human diseases associated with impaired lipid metabolism while also providing additional insights into the metabolic requirements of skeletal homeostasis.
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Affiliation(s)
- Priyanka Kushwaha
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Michael J Wolfgang
- Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ryan C Riddle
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Baltimore Veterans Administration Medical Center, Baltimore, MD, USA.
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26
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27
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Apolipoprotein E plays crucial roles in maintaining bone mass by promoting osteoblast differentiation via ERK1/2 pathway and by suppressing osteoclast differentiation via c-Fos, NFATc1, and NF-κB pathway. Biochem Biophys Res Commun 2018; 503:644-650. [DOI: 10.1016/j.bbrc.2018.06.055] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 06/11/2018] [Indexed: 12/27/2022]
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28
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Kim S, Li A, Monti S, Schlezinger JJ. Tributyltin induces a transcriptional response without a brite adipocyte signature in adipocyte models. Arch Toxicol 2018; 92:2859-2874. [PMID: 30027469 DOI: 10.1101/328203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 07/12/2018] [Indexed: 05/24/2023]
Abstract
Tributyltin (TBT), a peroxisome proliferator-activated receptor γ (PPARγ)/retinoid X receptor (RXR) ligand and founding member of the environmental obesogen chemical class, induces adipocyte differentiation and suppresses bone formation. A growing number of environmental PPARγ ligands are being identified. However, the potential for environmental PPARγ ligands to induce adverse metabolic effects has been questioned because PPARγ is a therapeutic target in treatment of type II diabetes. We evaluated the molecular consequences of TBT exposure during bone marrow multipotent mesenchymal stromal cell (BM-MSC) differentiation in comparison to rosiglitazone, a therapeutic PPARγ ligand, and LG100268, a synthetic RXR ligand. Mouse primary BM-MSCs (female, C57BL/6J) undergoing bone differentiation were exposed to maximally efficacious and human relevant concentrations of rosiglitazone (100 nM), LG100268 (100 nM) or TBT (80 nM) for 4 days. Gene expression was assessed using microarrays, and in silico functional annotation was performed using pathway enrichment analysis approaches. Pathways related to osteogenesis were downregulated by all three ligands, while pathways related to adipogenesis were upregulated by rosiglitazone and TBT. However, pathways related to mitochondrial biogenesis and brown-in-white (brite) adipocyte differentiation were more significantly upregulated in rosiglitazone-treated than TBT-treated cells. The lack of induction of genes involved in adipocyte energy dissipation by TBT was confirmed by an independent gene expression analysis in BM-MSCs undergoing adipocyte differentiation and by analysis of a publically available 3T3 L1 data set. Furthermore, rosiglitazone, but not TBT, induced mitochondrial biogenesis and respiration. This study is the first to show that an environmental PPARγ ligand has a limited capacity to induce health-promoting activities of PPARγ.
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Affiliation(s)
- Stephanie Kim
- Department of Environmental Health, Boston University School of Public Health, 715 Albany Street, R-405, Boston, MA, 02118, USA
| | - Amy Li
- Computational Biomedicine, Boston University School of Medicine, Boston, MA, USA
- Bioinformatics Program, Boston University, Boston, MA, USA
| | - Stefano Monti
- Computational Biomedicine, Boston University School of Medicine, Boston, MA, USA
- Bioinformatics Program, Boston University, Boston, MA, USA
| | - Jennifer J Schlezinger
- Department of Environmental Health, Boston University School of Public Health, 715 Albany Street, R-405, Boston, MA, 02118, USA.
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29
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Yang H, Hong N, Liu H, Wang J, Li Y, Wu S. Differentiated adipose-derived stem cell cocultures for bone regeneration in RADA16-I in vitro. J Cell Physiol 2018; 233:9458-9472. [PMID: 29995982 DOI: 10.1002/jcp.26838] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 05/10/2018] [Indexed: 02/06/2023]
Abstract
Craniofacial defects can cause morbidness. Adipose-derived stem cells (ADSCs) have shown great promise for osteogeneration and vascularization; therefore cocultures of differentiated ADSCs are explored to increase bone and vessel formation. In this study, ADSCs were induced into osteogenic ADSCs (os-ADSCs) and endothelial ADSCs (endo-ADSCs) cells, which were then cocultured in variable proportions (os-ADSCs/endo-ADSCs = 2:1, 1:1, 1:2). The os-ADSCs in a ratio of 1:1 expressed more ALP, RUNX2 and COL-I, whereas VEGF, vWF and CD31 were upregulated in the endo-ADSCs of this group. Next generation RNA sequencing (RNA-seq) was performed to evaluate the molecular mechanisms of cocultured ADSCs. The os-ADSCs and endo-ADSCs interacted with each other during osteogenic and angiogenic differentiation, especially at the ratio of 1:1, and were regulated by vascular-related genes, cell-mediated genes, bone-related genes and the transforming growth factor β signaling pathway (TGF-β), mitogen-activated protein kinase signaling pathway (MAPK) and wnt signaling pathway (Wnt). Angptl4, apoe, mmp3, bmp6, mmp13 and fgf18 were detected to be up-regulated, and cxcl12 and wnt5a were down-regulated. The results showed that the gene expression levels were consistent with that in RNA-seq. The cells were then seeded into self-assembling peptide RADA16-I scaffolds as cocultures (1:1) and monocultures (ADSCs, os-ADSCs, endo-ADSCs). The results showed that the cells of all groups grew and proliferated well on the scaffolds, and the cocultured group exhibited better osteogeneration and vascularization. In conclusion, cocultured os-ADSCs and endo-ADSCs at the ratio of 1:1 showed strong osteogenic and angiogenic differentiation. There is a great potential for osteogenesis and vascularization by 3D culturing cells in a 1:1 ratio in self-assembling peptide RADA16-I scaffolds, which requires evaluation for bone regeneration in vivo.
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Affiliation(s)
- Huifang Yang
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Nanrui Hong
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Hsiaowei Liu
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Jieda Wang
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Yan Li
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Shuyi Wu
- Department of Prosthodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China
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30
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Yang T, Williams BO. Low-Density Lipoprotein Receptor-Related Proteins in Skeletal Development and Disease. Physiol Rev 2017; 97:1211-1228. [PMID: 28615463 DOI: 10.1152/physrev.00013.2016] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 03/07/2017] [Accepted: 03/15/2017] [Indexed: 02/06/2023] Open
Abstract
The identification of the low-density lipoprotein receptor (LDLR) provided a foundation for subsequent studies in lipoprotein metabolism, receptor-mediated endocytosis, and many other fundamental biological functions. The importance of the LDLR led to numerous studies that identified homologous molecules and ultimately resulted in the description of the LDL-receptor superfamily, a group of proteins that contain domains also found in the LDLR. Subsequent studies have revealed that members of the LDLR-related protein family play roles in regulating many aspects of signal transduction. This review is focused on the roles of selected members of this protein family in skeletal development and disease. We present background on the identification of this subgroup of receptors, discuss the phenotypes associated with alterations in their function in human patients and mouse models, and describe the current efforts to therapeutically target these proteins to treat human skeletal disease.
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Affiliation(s)
- Tao Yang
- Program in Skeletal Disease and Tumor Microenvironment, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan
| | - Bart O Williams
- Program in Skeletal Disease and Tumor Microenvironment, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan
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31
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Abstract
Bone formation is an osteoblast-specific process characterized by high energy demands due to the secretion of matrix proteins and mineralization vesicles. While glucose has been reported as the principle fuel source for osteoblasts, recent evidence supports the tenet that osteoblasts can utilize fatty acids as well. Although the ability to accumulate lipid droplets has been demonstrated in many cell types, there has been little evidence that osteoblasts possess this characteristic. The current study provides evidence that osteoblastogenesis is associated with lipid droplet accumulation capable of supplying energy substrates (fatty acids) required for the differentiation process. Understanding the role of fatty acids in metabolic programming of the osteoblast may lead to novel approaches to increase bone formation and ultimately bone mass.
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Affiliation(s)
- Elizabeth Rendina-Ruedy
- Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
| | - Anyonya R. Guntur
- Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
| | - Clifford J. Rosen
- Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
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32
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Suchacki KJ, Roberts F, Lovdel A, Farquharson C, Morton NM, MacRae VE, Cawthorn WP. Skeletal energy homeostasis: a paradigm of endocrine discovery. J Endocrinol 2017; 234:R67-R79. [PMID: 28455432 DOI: 10.1530/joe-17-0147] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 04/28/2017] [Indexed: 12/15/2022]
Abstract
Throughout the last decade, significant developments in cellular, molecular and mouse models have revealed major endocrine functions of the skeleton. More recent studies have evolved the interplay between bone-specific hormones, the skeleton, marrow adipose tissue, muscle and the brain. This review focuses on literature from the last decade, addressing the endocrine regulation of global energy metabolism via the skeleton. In addition, we will highlight several recent studies that further our knowledge of new endocrine functions of some organs; explore remaining unanswered questions; and, finally, we will discuss future directions for this more complex era of bone biology research.
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Affiliation(s)
- Karla J Suchacki
- The Queen's Medical Research InstituteThe University of Edinburgh, Edinburgh, UK
| | - Fiona Roberts
- The Roslin InstituteThe University of Edinburgh, Easter Bush, Midltohian, UK
| | - Andrea Lovdel
- The Queen's Medical Research InstituteThe University of Edinburgh, Edinburgh, UK
| | - Colin Farquharson
- The Roslin InstituteThe University of Edinburgh, Easter Bush, Midltohian, UK
| | - Nik M Morton
- The Queen's Medical Research InstituteThe University of Edinburgh, Edinburgh, UK
| | - Vicky E MacRae
- The Roslin InstituteThe University of Edinburgh, Easter Bush, Midltohian, UK
| | - William P Cawthorn
- The Queen's Medical Research InstituteThe University of Edinburgh, Edinburgh, UK
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33
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Quantification of Bone Fatty Acid Metabolism and Its Regulation by Adipocyte Lipoprotein Lipase. Int J Mol Sci 2017; 18:ijms18061264. [PMID: 28608812 PMCID: PMC5486086 DOI: 10.3390/ijms18061264] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/03/2017] [Accepted: 06/05/2017] [Indexed: 12/15/2022] Open
Abstract
Adipocytes are master regulators of energy homeostasis. Although the contributions of classical brown and white adipose tissue (BAT and WAT, respectively) to glucose and fatty acid metabolism are well characterized, the metabolic role of adipocytes in bone marrow remains largely unclear. Here, we quantify bone fatty acid metabolism and its contribution to systemic nutrient handling in mice. Whereas in parts of the skeleton the specific amount of nutrients taken-up from the circulation was lower than in other metabolically active tissues such as BAT or liver, the overall contribution of the skeleton as a whole organ was remarkable, placing it among the top organs involved in systemic glucose as well as fatty acid clearance. We show that there are considerable site-specific variations in bone marrow fatty acid composition throughout the skeleton and that, especially in the tibia, marrow fatty acid profiles resemble classical BAT and WAT. Using a mouse model lacking lipoprotein lipase (LPL), a master regulator of plasma lipid turnover specifically in adipocytes, we show that impaired fatty acid flux leads to reduced amounts of dietary essential fatty acids while there was a profound increase in de novo produced fatty acids in both bone marrow and cortical bone. Notably, these changes in fatty acid profiles were not associated with any gross skeletal phenotype. These results identify LPL as an important regulator of fatty acid transport to skeletal compartments and demonstrate an intricate functional link between systemic and skeletal fatty acid and glucose metabolism.
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Papachristou NI, Blair HC, Kypreos KE, Papachristou DJ. High-density lipoprotein (HDL) metabolism and bone mass. J Endocrinol 2017; 233:R95-R107. [PMID: 28314771 PMCID: PMC5598779 DOI: 10.1530/joe-16-0657] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 03/17/2017] [Indexed: 02/06/2023]
Abstract
It is well appreciated that high-density lipoprotein (HDL) and bone physiology and pathology are tightly linked. Studies, primarily in mouse models, have shown that dysfunctional and/or disturbed HDL can affect bone mass through many different ways. Specifically, reduced HDL levels have been associated with the development of an inflammatory microenvironment that affects the differentiation and function of osteoblasts. In addition, perturbation in metabolic pathways of HDL favors adipoblastic differentiation and restrains osteoblastic differentiation through, among others, the modification of specific bone-related chemokines and signaling cascades. Increased bone marrow adiposity also deteriorates bone osteoblastic function and thus bone synthesis, leading to reduced bone mass. In this review, we present the current knowledge and the future directions with regard to the HDL-bone mass connection. Unraveling the molecular phenomena that underline this connection will promote the deeper understanding of the pathophysiology of bone-related pathologies, such as osteoporosis or bone metastasis, and pave the way toward the development of novel and more effective therapies against these conditions.
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Affiliation(s)
- Nicholaos I Papachristou
- Department of Anatomy-Histology-EmbryologyUnit of Bone and Soft Tissue Studies, University of Patras Medical School, Patras, Greece
| | - Harry C Blair
- Department of PathologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Pittsburgh VA Medical CenterPittsburgh, Pennsylvania, USA
| | - Kyriakos E Kypreos
- Department of PharmacologyUniversity of Patras Medical School, Patras, Greece
| | - Dionysios J Papachristou
- Department of Anatomy-Histology-EmbryologyUnit of Bone and Soft Tissue Studies, University of Patras Medical School, Patras, Greece
- Department of PathologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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Abstract
The rising incidence of metabolic diseases worldwide has prompted renewed interest in the study of intermediary metabolism and cellular bioenergetics. The application of modern biochemical methods for quantitating fuel substrate metabolism with advanced mouse genetic approaches has greatly increased understanding of the mechanisms that integrate energy metabolism in the whole organism. Examination of the intermediary metabolism of skeletal cells has been sparked by a series of unanticipated observations in genetically modified mice that suggest the existence of novel endocrine pathways through which bone cells communicate their energy status to other centers of metabolic control. The recognition of this expanded role of the skeleton has in turn led to new lines of inquiry directed at defining the fuel requirements and bioenergetic properties of bone cells. This article provides a comprehensive review of historical and contemporary studies on the metabolic properties of bone cells and the mechanisms that control energy substrate utilization and bioenergetics. Special attention is devoted to identifying gaps in our current understanding of this new area of skeletal biology that will require additional research to better define the physiological significance of skeletal cell bioenergetics in human health and disease.
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Affiliation(s)
- Ryan C Riddle
- Department of Orthopaedic Surgery, The Johns Hopkins University, Baltimore, Maryland; and The Baltimore Veterans Administration Medical Center, Baltimore, Maryland
| | - Thomas L Clemens
- Department of Orthopaedic Surgery, The Johns Hopkins University, Baltimore, Maryland; and The Baltimore Veterans Administration Medical Center, Baltimore, Maryland
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Calciolari E, Mardas N, Dereka X, Anagnostopoulos AK, Tsangaris GT, Donos N. The effect of experimental osteoporosis on bone regeneration: part 2, proteomics results. Clin Oral Implants Res 2016; 28:e135-e145. [PMID: 27580862 DOI: 10.1111/clr.12950] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/25/2016] [Indexed: 01/17/2023]
Abstract
OBJECTIVES To identify and describe protein expression in a Wistar rat calvarial critical size defect (CSD) model following treatment with guided bone regeneration in healthy and osteoporotic conditions. MATERIAL AND METHODS Thirty-six 10-month-old female Wistar rats were used. Half of them were ovariectomized (OVX) and fed with a low-calcium diet to induce an osteoporotic-like status. In each animal of both groups, two 5-mm calvarial CSDs were treated with deproteinized bovine bone mineral graft particles and a bilayer collagen membrane. Six OVX and six control rats were randomly euthanized at 7, 14, and 30 days. One defect/animal was randomly chosen for proteomic analysis. Differently expressed proteins between the two groups were identified with matrix-assisted laser desorption time-of-flight mass spectrometry and liquid chromatography-mass spectrometry/mass spectrometry. RESULTS At 7 days, 29 and 27 proteins were, respectively, identified in the healthy and OVX animals. At 14 days, 103 proteins were detected in the healthy controls and 20 proteins in the OVX rats, while at 30 days, 31 and 75 proteins were identified, respectively. Only limited proteins known to play a role in the later stages of bone formation and maturation were identified within the animals 'proteomes. DISCUSSION The osseous formation process was quite immature even at 30 days of healing. An overexpression of inflammatory and stress response pathways was detected in the OVX animals, as well as a tendency toward a delayed maturation of the osseous wound and a reduced/delayed differentiation of osteoblast cell precursors.
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Affiliation(s)
- E Calciolari
- Centre for Clinical Oral Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK.,Periodontology Department, UCL Eastman Dental Institute, London, UK
| | - N Mardas
- Centre for Adult Oral Health, Bart's & The London School of Dentistry & Medicine, Queen Mary University of London (QMUL), London, UK
| | - X Dereka
- Department of Periodontology, National and Kapodistrian University of Athens, Athens, Greece
| | - A K Anagnostopoulos
- Proteomics Research Unit, Centre of Basic Research II, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - G T Tsangaris
- Proteomics Research Unit, Centre of Basic Research II, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - N Donos
- Centre for Clinical Oral Research, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London, UK
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Martineau C, Najyb O, Signor C, Rassart É, Moreau R. Apolipoprotein D deficiency is associated to high bone turnover, low bone mass and impaired osteoblastic function in aged female mice. Metabolism 2016; 65:1247-58. [PMID: 27506732 PMCID: PMC7094319 DOI: 10.1016/j.metabol.2016.05.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 03/26/2016] [Accepted: 05/10/2016] [Indexed: 11/25/2022]
Abstract
BACKGROUND Apolipoprotein D (ApoD) is a member of the lipocalin family known to transport small hydrophobic ligands. A major site of ApoD expression in mice is the central nervous system where evidence suggests that it plays a protective role. Gene expression of ApoD was reported in bone-forming osteoblasts but its impact on bone metabolism remains undocumented. METHODS We compared basic bone parameters of ApoD(-/-) (null) and transgenic (tg) mice to wild-type (wt) littermates through microCT and histochemistry, as well as ApoD expression and secretion in osteoblasts under various culture conditions through real-time PCR and immunoblotting. RESULTS ApoD-null females displayed progressive bone loss with aging, resulting in a 50% reduction in trabecular bone volume and a 23% reduction in cortical bone volume by 9months of age. Only cortical bone volume was significantly reduced in ApoD-null males by an average of 24%. Histochemistry indicated significantly higher osteoblast surface and number of osteoclasts in femora from ApoD-null females. ApoD gene expression was confirmed in primary cultures of bone marrow mesenchymal cells (MSC), with higher expression levels in MSC from females compared to males. ApoD-null MSC exhibited impaired proliferation and differentiation potentials. Moreover, exogenous ApoD partially rescued the osteogenic potential of null MSC, which were shown to readily uptake the protein from media. ApoD expression was upregulated under low proliferation conditions, by contact inhibition and osteoblastic differentiation in MC3T3-E1 osteoblast-like cells. CONCLUSION Our results indicate that ApoD influences bone metabolism in mice in a gender-specific manner, potentially through an auto-/paracrine pathway.
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Affiliation(s)
- Corine Martineau
- Laboratoire du Métabolisme Osseux, Centre BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada.
| | - Ouafa Najyb
- Laboratoire de Biologie Moléculaire, Centre BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada
| | - Céline Signor
- Laboratoire du Métabolisme Osseux, Centre BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada
| | - Éric Rassart
- Laboratoire de Biologie Moléculaire, Centre BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada
| | - Robert Moreau
- Laboratoire du Métabolisme Osseux, Centre BioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada
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Gui Y, Chu N, Qiu X, Tang W, Gober HJ, Li D, Wang L. 17-β-estradiol up-regulates apolipoprotein genes expression during osteoblast differentiation in vitro. Biosci Trends 2016; 10:140-51. [PMID: 27074899 DOI: 10.5582/bst.2016.01007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Apolipoproteins are of great physiological importance and are associated with different diseases. Many independent studies of patterns of gene expression during osteoblast differentiation have been described, and some apolipoproteins have been induced during this process. 17-β-estradiol (E2) may enhance osteoblast physiological function. However, no studies have indicated whether E2 can modulate the expression of apolipoproteins during osteoblast differentiation in vitro. The aim of the current study was to observe the regulation of apolipoprotein mRNA expression by E2 during this process. Primary osteoblasts were collected from the calvaria of newborn mice and were subjected to osteoblast differentiation in vitro with serial concentrations of E2. RNA was isolated on days 0, 5, and 25 of differentiation. Real-time PCR was performed to analyze the levels of apolipoprotein mRNA. Results showed that during osteoblast differentiation all of the apolipoprotein genes were up-regulated by E2 in a dose-dependent manner. Moreover, only ApoE was strongly induced during the mineralization of cultured osteoblasts. This result suggests that ApoE might be involved in osteoblast differentiation. The hypothesis is that E2 promotes osteoblast differentiation by up-regulating ApoE gene expression, though further study is needed to confirm this hypothesis.
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Affiliation(s)
- Yuyan Gui
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
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Papachristou DJ, Blair HC. Bone and high-density lipoprotein: The beginning of a beautiful friendship. World J Orthop 2016; 7:74-77. [PMID: 26925377 PMCID: PMC4757660 DOI: 10.5312/wjo.v7.i2.74] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 10/15/2015] [Accepted: 12/02/2015] [Indexed: 02/06/2023] Open
Abstract
There is a tight link between bone and lipid metabolic pathways. In this vein, several studies focused on the exploration of high-density lipoprotein (HDL) in the pathobiology of bone diseases, with emphasis to the osteoarthritis (OA) and osteoporosis, the most common bone pathologies. Indeed, epidemiological and in vitro data have connected reduced HDL levels or dysfunctional HDL with cartilage destruction and OA development. Recent studies uncovered functional links between HDL and OA fueling the interesting hypothesis that OA could be a chronic element of the metabolic syndrome. Other studies have linked HDL to bone mineral density. Even though at epidemiological levels the results are conflicting, studies in animals as well as in vitro experiments have shown that HDL facilitates osteoblastogensis and bone synthesis and most probably affects osteoclastogenesis and osteoclast bone resorption. Notably, reduced HDL levels result in increased bone marrow adiposity affecting bone cells function. Unveiling the mechanisms that connect HDL and bone/cartilage homeostasis may contribute to the design of novel therapeutic agents for the improvement of bone and cartilage quality and thus for the treatment of related pathological conditions.
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40
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Gui Y, Duan Z, Qiu X, Tang W, Gober HJ, Li D, Wang L. Multifarious effects of 17-β-estradiol on apolipoprotein E receptors gene expression during osteoblast differentiation in vitro . Biosci Trends 2016; 10:54-66. [DOI: 10.5582/bst.2016.01006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yuyan Gui
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases
| | - Zhongliang Duan
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases
| | - Xuemin Qiu
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases
| | - Wei Tang
- Hepato-Biliary-Pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo
| | - Hans-Jürgen Gober
- Department of Pharmacy, Wagner Jauregg Hospital and Children's Hospital
| | - Dajin Li
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
| | - Ling Wang
- Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College
- Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases
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Hong W, Xu XY, Qiu ZH, Gao JJ, Wei ZY, Zhen L, Zhang XL, Ye ZB. Sirt1 is involved in decreased bone formation in aged apolipoprotein E-deficient mice. Acta Pharmacol Sin 2015; 36:1487-96. [PMID: 26592520 DOI: 10.1038/aps.2015.95] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Accepted: 09/15/2015] [Indexed: 12/19/2022] Open
Abstract
AIM Apolipoprotein E (ApoE) plays an important role in the transport and metabolism of lipids. Recent studies show that bone mass is increased in young apoE(-/-) mice. In this study we investigated the bone phenotype and metabolism in aged apoE(-/-) mice. METHODS Femurs and tibias were collected from 18- and 72-week-old apoE(-/-) mice and their age-matched wild-type (WT) littermates, and examined using micro-CT and histological analysis. Serum levels of total cholesterol, oxidized low-density lipoprotein (ox-LDL) and bone turnover markers were measured. Cultured bone mesenchymal stem cells (BMSCs) from tibias and femurs of 18-week-old apoE(-/-) mice were used in experiments in vitro. The expression levels of Sirt1 and Runx2 in bone tissue and BMSCs were measured using RT-PCR and Western blot analysis. RESULTS Compared with age-matched WT littermates, young apoE(-/-) mice exhibited high bone mass with increased bone formation, accompanied by higher serum levels of bone turnover markers OCN and TRAP5b, and higher expression levels of Sirt1, Runx2, ALP and OCN in bone tissue. In contrast, aged apoE(-/-) mice showed reduced bone formation and lower bone mass relative to age-matched WT mice, accompanied by lower serum OCN levels, and markedly reduced expression levels of Sirt1, Runx2, ALP and OCN in bone tissue. After BMSCs were exposed to ox-LDL (20 μg/mL), the expression of Sirt1 and Runx2 proteins was significantly increased at 12 h, and then decreased at 72 h. Treatment with the Sirt1 inhibitor EX527 (10 μmol/L) suppressed the expression of Runx2, ALP and OCN in BMSCs. CONCLUSION In contrast to young apoE(-/-) mice, aged apoE(-/-) mice showe lower bone mass than age-matched WT mice. Long-lasting exposure to ox-LDL decreases the expression of Sirt1 and Runx2 in BMSCs, which may explain the decreased bone formation in aged apoE(-/-) mice.
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Abstract
The skeleton, populated by large numbers of osteoblasts and long-lived osteocytes, requires a constant supply of energy-rich molecules to fuel the synthesis, deposition and mineralization of bone matrix during bone modelling and remodelling. When these energetic demands are not met, bone acquisition is suppressed. Recent findings suggest that key developmental signals emanating from Wnt low-density lipoprotein-related receptor 5 and hypoxia-inducible factor pathways impact osteoblast bioenergetics to accommodate the energy requirements for bone cells to fulfil their function. In vivo studies in several mutant mouse strains have confirmed a link between bone cells and global metabolism, ultimately leading to the identification of hormonal interactions between the skeleton and other tissues. The hormones insulin and leptin affect postnatal bone acquisition, whilst osteocalcin produced by the osteoblast in turn stimulates insulin secretion by the pancreas. These observations have prompted additional questions regarding the nature of the mechanisms of fuel sensing and processing in the osteoblast and their contribution to overall energy utilization and homeostasis. Answers to such questions should advance our understanding of metabolic diseases and may ultimately improve management of affected patients. In this review, we highlight recent studies in this field and offer a perspective on the evolutionary implications of bone as a metabolic endocrine organ.
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Affiliation(s)
- Q Zhang
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - R C Riddle
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Administration Medical Center, Baltimore, MD, USA
| | - T L Clemens
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Administration Medical Center, Baltimore, MD, USA
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López-Larramona G, Lucendo AJ, Tenías JM. Association between nutritional screening via the Controlling Nutritional Status index and bone mineral density in chronic liver disease of various etiologies. Hepatol Res 2015; 45:618-28. [PMID: 25059921 DOI: 10.1111/hepr.12395] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Revised: 07/04/2014] [Accepted: 07/21/2014] [Indexed: 12/13/2022]
Abstract
AIM Bone density disorders are prevalent in patients with chronic liver disease (CLD), who commonly present with hepatic osteodystrophy. However, the relationship between nutritional status and bone mineral density (BMD) has been scarcely studied in CLD. METHODS This single-center, cross-sectional study included outpatients consecutively diagnosed with CLD during a 1.5-year period. The nutritional status was assessed with the Controlling Nutritional Status (CONUT) index; dual-energy X-ray absorptiometry scans and parameters of bone mineral metabolism were carried out. Bone fracture risk was estimated with the World Health Organization FRAX tool. RESULTS Among the 126 patients recruited (58.7% male), osteopenia and osteoporosis were present in 31.1% and 10.7%, respectively. The 10-year fracture risk was significantly higher among women. Malnutrition estimated with the CONUT index was present in 29.9% of patients and was significantly more frequent in cirrhotic patients, 63.4% of whom were malnourished. Malnutrition stage directly correlated with hepatic function as expressed by the Model for End-Stage Liver Disease index. A non-significant relationship between CONUT-assessed nutritional status and BMD was documented. 25-Hydroxyvitamin-D3 (25[OH]-D3) and fracture risk correlated positively with the CONUT stage, and total cholesterol had an inverse relationship with BMD. CONCLUSION Malnutrition assessed by the CONUT was very frequent in patients with liver cirrhosis. The CONUT score inversely correlated with liver function, while malnutrition stage directly correlated with BMD, fracture risk and 25(OH)-D3. Total cholesterol showed a negative association with BMD in this population.
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Affiliation(s)
| | - Alfredo J Lucendo
- Gastroenterology Department, Hospital General de Tomelloso, Tomelloso, Spain
| | - José María Tenías
- Research Support Unit, Hospital Mancha-Centro, Alcázar de San Juan, Spain
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Abstract
Recent developments in endocrinology, made possible by the combination of mouse genetics, integrative physiology and clinical observations have resulted in rapid and unanticipated advances in the field of skeletal biology. Indeed, the skeleton, classically viewed as a structural scaffold necessary for mobility, and regulator of calcium-phosphorus homoeostasis and maintenance of the haematopoietic niche has now been identified as an important regulator of male fertility and whole-body glucose metabolism, in addition to the classical insulin target tissues. These seminal findings confirm bone to be a true endocrine organ. This review is intended to detail the key events commencing from the elucidation of osteocalcin (OC) in bone metabolism to identification of new and emerging candidates that may regulate energy metabolism independently of OC.
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Affiliation(s)
- K J Oldknow
- Developmental BiologyThe Roslin Institute, Edinburgh, UK
| | - V E MacRae
- Developmental BiologyThe Roslin Institute, Edinburgh, UK
| | - C Farquharson
- Developmental BiologyThe Roslin Institute, Edinburgh, UK
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45
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Mandal CC. High Cholesterol Deteriorates Bone Health: New Insights into Molecular Mechanisms. Front Endocrinol (Lausanne) 2015; 6:165. [PMID: 26557105 PMCID: PMC4617053 DOI: 10.3389/fendo.2015.00165] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 10/08/2015] [Indexed: 01/09/2023] Open
Abstract
Many epidemiological studies show a positive connection between cardiovascular diseases and risk of osteoporosis, suggesting a role of hyperlipidemia and/or hypercholesterolemia in regulating osteoporosis. The majority of the studies indicated a correlation between high cholesterol and high LDL-cholesterol level with low bone mineral density, a strong predictor of osteoporosis. Similarly, bone metastasis is a serious complication of cancer for patients. Several epidemiological and basic studies have established that high cholesterol is associated with increased cancer risk. Moreover, osteoporotic bone environment predisposes the cancer cells for metastatic growth in the bone microenvironment. This review focuses on how cholesterol and cholesterol-lowering drugs (statins) regulate the functions of bone residential osteoblast and osteoclast cells to augment or to prevent bone deterioration. Moreover, this study provides an insight into molecular mechanisms of cholesterol-mediated bone deterioration. It also proposes a potential mechanism by which cellular cholesterol boosts cancer-induced bone metastasis.
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Affiliation(s)
- Chandi C. Mandal
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Rajasthan, India
- *Correspondence: Chandi C. Mandal,
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Zhang SQ, Zhang WY, Ye WQ, Zhang LJ, Fan F. Apolipoprotein E gene E2/E2 genotype is a genetic risk factor for vertebral fractures in humans: a large-scale study. INTERNATIONAL ORTHOPAEDICS 2014; 38:1665-9. [PMID: 24880936 DOI: 10.1007/s00264-014-2380-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Accepted: 05/07/2014] [Indexed: 01/04/2023]
Abstract
PURPOSE Although many studies have been performed to evaluate whether or not apolipoprotein E gene (APOE) polymorphisms are differentially associated with bone mineral density (BMD) and fractures, the results have been conflicting. This large-scale study was performed to investigate whether a relationship exists between APOE polymorphisms and risk of fracture. METHODS A hospital-based case-control study was conducted in 3,000 patients with fractures and 3,000 age- and gender-matched healthy controls. Polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) assay was applied to assess the APOE gene polymorphisms. RESULTS Patients with fractures had a significantly higher frequency of APOE E2/E2 genotype [odds ratio (OR) = 2.02, 95% confidence interval (CI) = 1.30, 3.14; P = 0.002] than healthy controls. When stratifying by fracture type, it was found that patients with vertebral fractures had a significantly higher frequency of APOE E2/E2 genotype (OR = 2.86, 95% CI = 1.73, 4.73; P < 0.001). No significant differences were found in nonvertebral (hip or wrist or other) fractures. CONCLUSIONS Our study suggests that APOE E2/E2 genotype is a potential genetic risk factor for vertebral fractures in humans.
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Affiliation(s)
- Shu Qi Zhang
- Department of Nursing, Changhai Hospital Affiliated to the Second Military Medical University, NO.168 Changhai Road, Shanghai, 200433, China
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Bartelt A, Beil FT, Müller B, Koehne T, Yorgan TA, Heine M, Yilmaz T, Rüther W, Heeren J, Schinke T, Niemeier A. Hepatic lipase is expressed by osteoblasts and modulates bone remodeling in obesity. Bone 2014; 62:90-8. [PMID: 24440515 DOI: 10.1016/j.bone.2014.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 12/18/2013] [Accepted: 01/07/2014] [Indexed: 01/23/2023]
Abstract
A number of unexpected molecules were recently identified as products of osteoblasts, linking bone homeostasis to systemic energy metabolism. Here we identify the lipolytic enzyme hepatic lipase (HL, encoded by Lipc) as a novel cell-autonomous regulator of osteoblast function. In an unbiased genome-wide expression analysis, we find Lipc to be highly induced upon osteoblast differentiation, verified by quantitative Taqman analyses of primary osteoblasts in vitro and of bone samples in vivo. Functionally, loss of HL in vitro leads to increased expression and secretion of osteoprotegerin (OPG), while expression of some osteoblast differentiation makers is impaired. When challenging energy metabolism in a diet-induced obesity (DIO) study, lack of HL leads to a significant increase in bone formation markers and a decrease in bone resorption markers. Accordingly, in the DIO setting, we observe in Lipc(-/-) animals but not in wild-type controls a significant increase in lumbar vertebral trabecular bone mass and formation rate as well as in femoral trabecular bone mass and cortical thickness. Taken together, we demonstrate that HL expressed by osteoblasts has an impact on osteoblast OPG expression and that lack of HL leads to increased bone mass in DIO. These data provide a novel and completely unexpected molecular link in the complex interplay of osteoblasts and systemic energy metabolism.
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Affiliation(s)
- Alexander Bartelt
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany; Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - F Timo Beil
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany; Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Brigitte Müller
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany; Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Till Koehne
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Timur A Yorgan
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Markus Heine
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Tayfun Yilmaz
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Wolfgang Rüther
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Joerg Heeren
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Thorsten Schinke
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
| | - Andreas Niemeier
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany; Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
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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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Martineau C, Martin-Falstrault L, Brissette L, Moreau R. The atherogenic Scarb1 null mouse model shows a high bone mass phenotype. Am J Physiol Endocrinol Metab 2014; 306:E48-57. [PMID: 24253048 PMCID: PMC3920004 DOI: 10.1152/ajpendo.00421.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Scavenger receptor class B, type I (SR-BI), the Scarb1 gene product, is a receptor associated with cholesteryl ester uptake from high-density lipoproteins (HDL), which drives cholesterol movement from peripheral tissues toward the liver for excretion, and, consequently, Scarb1 null mice are prone to atherosclerosis. Because studies have linked atherosclerosis incidence with osteoporosis, we characterized the bone metabolism in these mice. Bone morphometry was assessed through microcomputed tomography and histology. Marrow stromal cells (MSCs) were used to characterize influence of endogenous SR-BI in cell functions. Total and HDL-associated cholesterol in null mice were increased by 32-60%, correlating with its role in lipoprotein metabolism. Distal metaphyses from 2- and 4-mo-old null mice showed correspondingly 46 and 37% higher bone volume fraction associated with a higher number of trabeculae. Histomorphometric analyses in 2-mo-old null male mice revealed 1.42-fold greater osteoblast surface, 1.37-fold higher percent mineralizing surface, and 1.69-fold enhanced bone formation rate. In vitro assays for MSCs from null mice revealed 37% higher proliferation rate, 48% more alkaline phosphatase activity, 70% greater mineralization potential and a 2-fold osterix (Sp7) expression, yet a 0.5-fold decrease in caveolin-1 (Cav1) expression. Selective uptake levels of HDL-associated cholesteryl oleate and estradiol were similar between MSC from wild-type and Scarb1 null mice, suggesting that its contribution to this process is not its main role in these cells. However, Scarb1 knockout stunted the HDL-dependent regulation of Cav1 genic expression. Scarb1 null mice are not prone to osteoporosis but show higher bone mass associated with enhanced bone formation.
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Affiliation(s)
- Corine Martineau
- Laboratoire du Métabolisme Osseux, BioMed, Université du Québec à Montréal, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Quebec, Canada; and
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Suzuki O. Octacalcium phosphate (OCP)-based bone substitute materials. JAPANESE DENTAL SCIENCE REVIEW 2013. [DOI: 10.1016/j.jdsr.2013.01.001] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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