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Teng H, Hang Q, Zheng C, Yan Y, Liu S, Zhao Y, Deng Y, Nie L, Wu W, Sheldon M, Yu Z, Shi W, Gao J, Meng C, Martinez C, Zhang J, Yao F, Sun Y, Zhao D, Gan B, Meng T, Ma L. In vivo CRISPR activation screen identifies acyl-CoA-binding protein as a driver of bone metastasis. Sci Transl Med 2025; 17:eado7225. [PMID: 40397713 DOI: 10.1126/scitranslmed.ado7225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 12/03/2024] [Accepted: 04/29/2025] [Indexed: 05/23/2025]
Abstract
One of the most common sites of cancer metastasis is to the bone. Bone metastasis is associated with substantial morbidity and mortality, and current therapeutic interventions remain largely palliative. Metastasizing tumor cells need to reprogram their metabolic states to adapt to the nutrient environment of distant organs; however, the role and translational relevance of lipid metabolism in bone metastasis remain unclear. Here, we used an in vivo CRISPR activation screening system coupled with positive selection to identify acyl-coenzyme A (CoA) binding protein (ACBP) as a bone metastasis driver. In nonmetastatic and weakly metastatic cancer cells, overexpression of wild-type ACBP, but not the acyl-CoA-binding deficient mutant, stimulated fatty acid oxidation (FAO) and bone metastasis. Conversely, knockout of ACBP in highly bone metastatic cancer cells abrogated metastatic bone colonization. Mechanistically, ACBP-mediated FAO increased ATP and NADPH production, reduced reactive oxygen species, and inhibited lipid peroxidation and ferroptosis. We found that ACBP expression correlated with metabolic signaling, bone metastatic ability, and poor clinical outcomes. In mouse models, pharmacological blockade of FAO or treatment with a ferroptosis inducer inhibited bone metastasis. Together, our findings reveal the role of lipid metabolism in tumor cells adapting and thriving in the bone and identify ACBP as a key regulator of this process. Agents that target FAO or induce ferroptosis represent a promising therapeutic approach for treating bone metastases.
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Affiliation(s)
- Hongqi Teng
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Qinglei Hang
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Caishang Zheng
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yuelong Yan
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Shaomin Liu
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yang Zhao
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yalan Deng
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Litong Nie
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Weiche Wu
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Marisela Sheldon
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Zachary Yu
- Department of Chemistry, Rice University, Houston, TX 77005, USA
| | - Wei Shi
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Jianxuan Gao
- Department of Orthopedics, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China
- Tongji University Cancer Center, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200080, China
| | - Chenling Meng
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Consuelo Martinez
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Jie Zhang
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Fan Yao
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yutong Sun
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Di Zhao
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX 77030, USA
| | - Boyi Gan
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX 77030, USA
| | - Tong Meng
- Department of Orthopedics, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China
- Tongji University Cancer Center, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200080, China
| | - Li Ma
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX 77030, USA
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Patel D, Lee TJ, Kumar S, Vyavahare S, Worth A, Hill WD, Hamrick M, Isales CM, Shinde RS, Fulzele S. Alterations in bone metabolites with age in C57BL/6 mice model. Biogerontology 2022; 23:629-640. [PMID: 36056226 PMCID: PMC10918568 DOI: 10.1007/s10522-022-09986-7] [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: 03/18/2022] [Accepted: 08/17/2022] [Indexed: 11/28/2022]
Abstract
Understanding the pathophysiology behind age-related diseases is an urgent need as the elderly population continues to grow. With age, there is a high risk of musculoskeletal deterioration and associated morbidity and mortality. Although the exact mechanism behind age-related degeneration is unknown, it is well established that alteration in cellular metabolism is one of the important contributing factors. Alteration in signaling pathways with age leads to the accumulation or depletion of several metabolites that play a vital role in musculoskeletal pathophysiology. This study aimed to identify age-related changes in bone tissue metabolites in C57BL/6 mice. We then correlated the differentially expressed metabolites with their functions in bone biology. In both aged males and females, hydroxyproline, glutamine, and alpha-linolenic acid levels were decreased. In aged females, Ornithine (p value = 0.001), L-Proline (p value = 0.008), Uridine (p value = 0.001), Aspartic Acid (p value = 0.004) levels were significantly decreased, and glutamate (p value = 0.002) was elevated. In aged males, N-acetyl-D-glucosamine (pvalue = 0.010), Adrenic acid (pvalue = 0.0099), Arachidonic acid (p value = 0.029) and Allantoin (p value = 0.004) levels were decreased. Metabolic pathway analysis revealed that purine and D-glutamine and D-glutamate metabolism were significantly altered in both sexes, while arginine biosynthesis in females and lipid metabolism in males were highly affected. These differences in metabolic signaling might be one of the reasons for the discrepancy in musculoskeletal disease manifestation between the two sexes. Understanding the role of these metabolites play in the aging bone will allow for new sex-specific targeted therapies against the progression of musculoskeletal diseases.
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Affiliation(s)
- Dhara Patel
- Department of Medicine, Augusta University, Augusta, GA, 30912, USA
| | - Tae Jin Lee
- Center for Biotechnology and Genomic Medicine, Augusta University, Augusta, GA, 30912, USA
| | - Sandeep Kumar
- Department of Cell Biology and Anatomy, Augusta University, Augusta, GA, USA
| | - Sagar Vyavahare
- Department of Cell Biology and Anatomy, Augusta University, Augusta, GA, USA
| | - Alison Worth
- Immunology, Microenvironment and Metastasis Program, The Wistar Institute Cancer Center, Philadelphia, PA, USA
| | - William D Hill
- Medical University of South Carolina, Charleston, SC, 29403, USA
| | - Mark Hamrick
- Department of Cell Biology and Anatomy, Augusta University, Augusta, GA, USA
- Center for Healthy Aging, Augusta University, Augusta, GA, USA
| | - Carlos M Isales
- Department of Medicine, Augusta University, Augusta, GA, 30912, USA
- Center for Healthy Aging, Augusta University, Augusta, GA, USA
| | - Rahul S Shinde
- Immunology, Microenvironment and Metastasis Program, The Wistar Institute Cancer Center, Philadelphia, PA, USA
| | - Sadanand Fulzele
- Department of Medicine, Augusta University, Augusta, GA, 30912, USA.
- Department of Cell Biology and Anatomy, Augusta University, Augusta, GA, USA.
- Center for Healthy Aging, Augusta University, Augusta, GA, USA.
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Omer M, Ali H, Orlovskaya N, Ballesteros A, Cheong VS, Martyniak K, Wei F, Collins BE, Yarmolenko SN, Asiatico J, Kinzel M, Ngo C, Sankar J, Calder A, Gilbertson T, Meckmongkol T, Ghosh R, Coathup M. Omega-9 Modifies Viscoelasticity and Augments Bone Strength and Architecture in a High-Fat Diet-Fed Murine Model. Nutrients 2022; 14:nu14153165. [PMID: 35956341 PMCID: PMC9370223 DOI: 10.3390/nu14153165] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 07/25/2022] [Accepted: 07/28/2022] [Indexed: 02/04/2023] Open
Abstract
The influence of diet on the development of osteoporosis is significant and not fully understood. This study investigated the effect of diets of varying lipid profiles and ω-3, ω-6 and ω-9 composition on the structural and mechanical properties of bone. The hypothesis studied was that a diet high in saturated fat would induce osteoporosis and produce an overall increased detrimental bony response when compared with a diet high in unsaturated ω-6, or ω-9. Male C57BL/6J mice were fed either a control diet, 50:50 mix (saturated:unsaturated) high in ω-9 (HFD50:50), a diet high in saturated fat (HSF) or a polyunsaturated fat diet high in ω-6 (PUFA) over an 8-week duration. Tibiae were retrieved and evaluated using DMA, 3-point-bending, histomorphometry, and microCT. Mice fed a HSF diet displayed key features characteristic of osteoporosis. The loss tangent was significantly increased in the HFD50:50 diet group compared with control (p = 0.016) and PUFA-fed animals (p = 0.049). HFD50:50-fed mice presented with an increased viscous component, longer tibiae, increased loss modulus (p = 0.009), and ultimate stress, smaller microcracks (p < 0.001), and increased trabecular width (p = 0.002) compared with control animals. A diet high in ω-9 resulted in an overall superior bone response and further analysis of its role in bone health is warranted.
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Affiliation(s)
- Mahmoud Omer
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
- Correspondence:
| | - Hessein Ali
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
| | - Nina Orlovskaya
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
| | - Amelia Ballesteros
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA; (A.C.); (T.G.)
| | - Vee San Cheong
- Department of Automatic Control and Systems Engineering, Insigneo Institute for In Silico Medicine, University of Sheffield, Sheffield S1 3JD, UK;
| | - Kari Martyniak
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
| | - Fei Wei
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
| | - Boyce E. Collins
- Engineering Research Center for Revolutionizing Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; (B.E.C.); (S.N.Y.); (J.S.)
| | - Sergey N. Yarmolenko
- Engineering Research Center for Revolutionizing Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; (B.E.C.); (S.N.Y.); (J.S.)
| | - Jackson Asiatico
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
| | - Michael Kinzel
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
| | - Christopher Ngo
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA; (A.C.); (T.G.)
| | - Jagannathan Sankar
- Engineering Research Center for Revolutionizing Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; (B.E.C.); (S.N.Y.); (J.S.)
| | - Ashley Calder
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA; (A.C.); (T.G.)
| | - Timothy Gilbertson
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA; (A.C.); (T.G.)
| | - Teerin Meckmongkol
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
- Department of General Surgery, Nemours Children’s Hospital, Orlando, FL 32827, USA
| | - Ranajay Ghosh
- Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (N.O.); (J.A.); (M.K.); (R.G.)
| | - Melanie Coathup
- Biionix Cluster, University of Central Florida, Orlando, FL 32827, USA; (A.B.); (K.M.); (F.W.); (C.N.); (T.M.); (M.C.)
- College of Medicine, University of Central Florida, Orlando, FL 32827, USA; (A.C.); (T.G.)
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Wang L, Zhang C, Liang H, Zhou N, Huang T, Zhao Z, Luo X. Polyunsaturated Fatty Acids Level and Bone Mineral Density: A Two-Sample Mendelian Randomization Study. Front Endocrinol (Lausanne) 2022; 13:858851. [PMID: 35872990 PMCID: PMC9304696 DOI: 10.3389/fendo.2022.858851] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 05/31/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND This Mendelian randomization (MR) study aimed to explore the causal relationship between polyunsaturated fatty acids (PUFAs) and bone mineral density (BMD). METHODS We conducted a two-sample MR analysis to figure out if there is any causal effect of PUFAs on BMD through the summary data from the genome-wide association study (GWAS). Relationships were evaluated through inverse variance weighted (IVW), MR-Egger, weighted median, and maximum likelihood methods. The MR Pleiotropy RESidual Sum and Outlier (MR-PRESSO) test was performed to detect the horizontal pleiotropy. RESULTS Our findings revealed that omega-6 fatty acids were negatively related to the TB-BMD (beta-estimate: -0.0515; 95% confidence interval [CI]: -0.0911 to -0.0119; standard error [SE]: 0.0201; p-value: 0.0106). The reverse direction MR analysis showed that TB-BMD was linked to the omega-6 FAs (beta-estimate: -0.0699; 95% CI: -0.1304 to -0.0095; SE: 0.0308; p-value: 0.0265). No statistically significant correlations between PUFAs and BMD were observed after adjusting the interactions between metabolites. CONCLUSION This two-sample MR analyses produced strong and new genomic evidence that there was a causal relationship between omega-6 FAs and BMD. Further investigations are still required to elucidate the potential mechanism.
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Affiliation(s)
- Lin Wang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Chao Zhang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Hao Liang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Nian Zhou
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Tianji Huang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Zenghui Zhao
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
| | - Xiaoji Luo
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Orthopedic Laboratory of Chongqing Medical University, Chongqing, China
- *Correspondence: Xiaoji Luo,
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Abdelhamid A, Hooper L, Sivakaran R, Hayhoe RPG, Welch A. The Relationship Between Omega-3, Omega-6 and Total Polyunsaturated Fat and Musculoskeletal Health and Functional Status in Adults: A Systematic Review and Meta-analysis of RCTs. Calcif Tissue Int 2019; 105:353-372. [PMID: 31346665 DOI: 10.1007/s00223-019-00584-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 07/05/2019] [Indexed: 12/12/2022]
Abstract
We conducted a systematic review and meta-analysis to assess the effects of increasing dietary omega-3, omega-6 and mixed polyunsaturated fatty acids (PUFA) on musculoskeletal health, functional status, sarcopenia and risk of fractures. We searched Medline, Embase, The Cochrane library, ClinicalTrials.gov and the WHO International Clinical Trials Registry Platform (ICTRP) databases for Randomised Controlled Trials (RCTs) of adults evaluating the effects of higher versus lower oral omega-3, omega-6 or mixed PUFA for ≥ 6 months on musculoskeletal and functional outcomes. We included 28 RCTs (7288 participants, 31 comparisons), 23 reported effects of omega-3, one of omega-6 and four of mixed total PUFA. Participants and doses were heterogeneous. Six omega-3 trials were judged at low summary risk of bias. We found low-quality evidence that increasing omega-3 increased lumbar spine BMD by 2.6% (0.03 g/cm2, 95% CI - 0.02 to 0.07, 463 participants). There was also the suggestion of an increase in femoral neck BMD (of 4.1%), but the evidence was of very low quality. There may be little or no effect of omega-3 on functional outcomes and bone mass; effects on other outcomes were unclear. Only one study reported on effects of omega-6 with very limited data. Increasing total PUFA had little or no effect on BMD or indices of fat-free (skeletal) muscle mass (low-quality evidence); no data were available on fractures, BMD or functional status and data on bone turnover markers were limited. Trials assessing effects of increasing omega-3, omega-6 and total PUFA on functional status, bone and skeletal muscle strength are limited with data lacking or of low quality. Whilst there is an indication that omega-3 may improve BMD, high-quality RCTs are needed to confirm this and effects on other musculoskeletal outcomes.
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Affiliation(s)
- Asmaa Abdelhamid
- Norwich Medical School, University of East Anglia, Research Park, Norwich, NR4 7TJ, UK.
| | - Lee Hooper
- Norwich Medical School, University of East Anglia, Research Park, Norwich, NR4 7TJ, UK.
| | - Ruksana Sivakaran
- Norwich Medical School, University of East Anglia, Research Park, Norwich, NR4 7TJ, UK
| | - Richard P G Hayhoe
- Norwich Medical School, University of East Anglia, Research Park, Norwich, NR4 7TJ, UK
| | - Ailsa Welch
- Norwich Medical School, University of East Anglia, Research Park, Norwich, NR4 7TJ, UK
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Arsic A, Pesic G, Petrovic S, Matic A, Jeremic J, Jakovljevic V, Vucic V. Adverse plasma fatty acid composition in patients with femoral neck fracture 1. Can J Physiol Pharmacol 2019; 98:61-66. [PMID: 31491342 DOI: 10.1139/cjpp-2019-0249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Our study aimed to examine the status of plasma fatty acids (FAs), inflammatory markers, and lipid peroxidation in patients with femoral neck fractures. The study included 20 patients (64-86 years) with femoral neck fractures indicated for surgery and a control group of 17 elderly subjects without fractures or serious chronic diseases. Plasma was obtained during the first 12 h postfracture and presurgery and 7 days postop. Compared to the control, patients had significantly higher saturated FA (SFA) and monounsaturated FA as well as increased TNF-α and IL-6. Opposite to that, levels of individual and total n-6 polyunsaturated FA (PUFA), individual and total n-3 PUFA, n-6/n-3 ratio, and levels of thiobarbituric acid reactive substances (TBARS) were markedly lower in the patient than in the controls. On the seventh day after the surgery, we showed a further rise in the SFA, oleic acid, and TNF-α and reductions of n-6 PUFA and IL-6. Taken together, our results suggest that altered FA status, especially reduced PUFA, may influence hip fracture repair and even contribute to femoral fracture susceptibility in the elderly. A potential benefit from nutritional intervention with PUFA in prevention and (or) fracture healing should be considered.
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Affiliation(s)
- Aleksandra Arsic
- Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research, University of Belgrade, Belgrade, Serbia
| | - Goran Pesic
- Orthopedic and Traumatology Clinic, Podgorica, Montenegro
| | - Snjezana Petrovic
- Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research, University of Belgrade, Belgrade, Serbia
| | - Aleksandar Matic
- Clinic of Orthopedic Surgery, Clinical Centre of Kragujevac, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Jovana Jeremic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Vladimir Jakovljevic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Vesna Vucic
- Centre of Research Excellence in Nutrition and Metabolism, Institute for Medical Research, University of Belgrade, Belgrade, Serbia
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Mak IL, Lavery P, Agellon S, Rauch F, Murshed M, Weiler HA. Arachidonic acid exacerbates diet-induced obesity and reduces bone mineral content without impacting bone strength in growing male rats. J Nutr Biochem 2019; 73:108226. [PMID: 31520815 DOI: 10.1016/j.jnutbio.2019.108226] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/28/2019] [Accepted: 08/09/2019] [Indexed: 12/30/2022]
Abstract
Long-chain polyunsaturated fatty acids modulate bone mass and adipocyte metabolism. Arachidonic acid (AA, C20:4 n-6) is elevated in obesity and postulated to stimulate bone resorption. This study aimed to determine the effect of AA on bone mass, quality, and adiposity in diet-induced obesity during growth. Male Sprague-Dawley rats (n=42, 4-week) were randomized into groups fed a control diet (CTRL, AIN-93G), high-fat diet (HFD, 35% kcal fat) or HFD + AA (1% w/w diet) for 6 weeks. Body composition, bone mineral density and microarchitecture were measured using dual-energy X-ray absorptiometry and micro-computed tomography. Red blood cell fatty acid profile was measured with gas chromatography. Group differences were evaluated using repeated measures two-way analysis of variance with Tukey-Kramer post hoc testing. Total energy intake did not differ among diet groups. At week 6, HFD + AA had significantly greater body fat % (12%), body weight (6%) and serum leptin concentrations (125%) than CTRL, whereas visceral fat (mass and %, assessed with micro-computed tomography) was increased in both HFD and HFD + AA groups. HFD + AA showed reduced whole body bone mineral content and femur mid-diaphyseal cortical bone cross-sectional area than HFD and CTRL, without impairment in bone strength. Contrarily, HFD + AA had greater femur metaphyseal trabecular vBMD (35%) and bone volume fraction (5%) compared to controls. Inclusion of AA elevated leptin concentrations in male rats. The early manifestations of diet-induced obesity on bone mass were accelerated with AA. Studies of longer duration are needed to clarify the effect of AA on peak bone mass following growth cessation.
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Affiliation(s)
- Ivy L Mak
- School of Human Nutrition, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
| | - Paula Lavery
- School of Human Nutrition, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
| | - Sherry Agellon
- School of Human Nutrition, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
| | - Frank Rauch
- Shriners' Hospital for Children, 1003 Decarie Boulevard, Montreal, QC, Canada H4A 0A9
| | - Monzur Murshed
- Shriners' Hospital for Children, 1003 Decarie Boulevard, Montreal, QC, Canada H4A 0A9; Faculty of Dentistry, McGill University, 3640 rue University, Montreal, QC, Canada H3A 0C7
| | - Hope A Weiler
- School of Human Nutrition, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9.
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Aydoğan BI, Erarslan E, Ünlütürk U, Güllü S. Effects of telmisartan and losartan treatments on bone turnover markers in patients with newly diagnosed stage I hypertension. J Renin Angiotensin Aldosterone Syst 2019; 20:1470320319862741. [PMID: 31328615 PMCID: PMC6647217 DOI: 10.1177/1470320319862741] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION Telmisartan is an angiotensin-II receptor type-1 blocker and a partial agonist for peroxisome proliferator-activated receptor-γ. The aim of this study was to determine the potential effects of telmisartan on bone metabolism and turnover markers. METHODS Forty-two patients with newly diagnosed stage I hypertension who were prescribed telmisartan 80 mg/day or losartan 100 mg/day were included. Serum levels of calcium, phosphorus, 25-hydroxy vitamin D, bone-specific alkaline phosphatase, osteocalcin, interleukin 6 and 24-hour urinary N-terminal telopeptide were measured at the beginning and after 12 weeks of treatment. RESULTS When treatment arms were evaluated together, significantly increased 25-hydroxy vitamin D levels (p=0.01), and decreased parathormone (PTH) (p<0.001), bone-specific alkaline phosphatase (p=0.01), osteocalcin (p=0.045), urinary N-terminal telopeptide (p<0.001) and interleukin 6 levels (p=0.006) were observed. After eliminating the 25-hydroxy vitamin D effect, significant changes were not observed at any of the parameters. None of the levels of parameters were different between groups. CONCLUSIONS Neither telmisartan, despite its partial peroxisome proliferator-activated receptor-γ agonistic effect, nor losartan treatment had significant effects on bone turnover markers in newly diagnosed stage I hypertensive patients.
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Affiliation(s)
- Berna I Aydoğan
- 1 Department of Endocrinology and Metabolism, Ankara University School of Medicine, Turkey
| | - Emrah Erarslan
- 1 Department of Endocrinology and Metabolism, Ankara University School of Medicine, Turkey
| | - Uğur Ünlütürk
- 1 Department of Endocrinology and Metabolism, Ankara University School of Medicine, Turkey.,2 Department of Endocrinology and Metabolism, Hacettepe University School of Medicine, Turkey
| | - Sevim Güllü
- 1 Department of Endocrinology and Metabolism, Ankara University School of Medicine, Turkey
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9
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Li X, Shet K, Xu K, Rodríguez JP, Pino AM, Kurhanewicz J, Schwartz A, Rosen CJ. Unsaturation level decreased in bone marrow fat of postmenopausal women with low bone density using high resolution magic angle spinning (HRMAS) 1H NMR spectroscopy. Bone 2017; 105:87-92. [PMID: 28823880 PMCID: PMC5650928 DOI: 10.1016/j.bone.2017.08.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 08/03/2017] [Accepted: 08/16/2017] [Indexed: 10/19/2022]
Abstract
There are increasing evidences suggesting bone marrow adiposity tissue (MAT) plays a critical role in affecting both bone quantity and quality. However, very limited studies that have investigated the association between the composition of MAT and bone mineral density (BMD). The goal of this study was to quantify MAT unsaturation profile of marrow samples from post-menopausal women using ex vivo high-resolution magic angle spinning (HRMAS) proton nuclear magnetic resonance (1H NMR) spectroscopy, and to investigate the relationship between MAT composition and BMD. Bone marrow samples were obtained by iliac crest aspiration during surgical procedures from 24 postmenopausal women (65-89years) who had hip surgery due to bone fracture or arthroplasty. Marrow fat composition parameters, in particular, unsaturation level (UL), mono-unsaturation level (MUL) and saturation level (SL), were quantified using HRMAS 1H NMR spectroscopy. The patients were classified into three groups based on the DXA BMD T-scores: controls, osteopenia and osteoporosis. Marrow fat composition was compared between these three groups as well as between subjects with and without factures using ANOCOVA, adjusted for age. Subjects with lower BMD (n=17) had significantly lower MUL (P=0.003) and UL (P=0.039), and significantly higher SL (P=0.039) compared to controls (n=7). When separating lower BMD into osteopenia (n=9) and osteoporosis (n=8) groups, subjects with osteopenia had significantly lower MUL (P=0.002) and UL (P=0.010), and significantly higher SL (P=0.010) compared to healthy controls. No significant difference was observed between subjects with osteopenia and osteoporosis. Using HRMAS 1H NMR, significantly lower unsaturation and significantly higher saturation levels were observed in the marrow fat of subjects with lower BMD. HRMAS 1H NMR was shown to be a powerful tool for identifying novel MR markers of marrow fat composition that are associated with bone quality and potentially fracture, and other bone pathologies and changes after treatment. A better understanding of the relationship between bone marrow composition and bone quality in humans may identify novel treatment targets, and provide guidance on novel interventions and therapeutic strategies for bone preservation.
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Affiliation(s)
- Xiaojuan Li
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA.
| | - Keerthi Shet
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA
| | - Kaipin Xu
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA.
| | - Juan Pablo Rodríguez
- Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile.
| | - Ana María Pino
- Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile.
| | - John Kurhanewicz
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA.
| | - Ann Schwartz
- Department of Epidemiology and Biostatistics, University of California, San Francisco, USA.
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10
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Kuroda T, Ohta H, Onoe Y, Tsugawa N, Shiraki M. Intake of omega-3 fatty acids contributes to bone mineral density at the hip in a younger Japanese female population. Osteoporos Int 2017. [PMID: 28646239 DOI: 10.1007/s00198-017-4128-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
UNLABELLED This study investigated the relationships between intakes of polyunsaturated fatty acids, omega-3 fatty acids, and omega-6 fatty acids and bone mineral density in Japanese women aged 19 to 25 years. Intakes of omega-3 fatty acids (n-3) were positively associated with peak bone mass at the hip. INTRODUCTION Lifestyle factors such as physical activity and nutrition intake are known to optimize the peak bone mass (PBM). Recently, intake of polyunsaturated fatty acids (PUFAs) has been reported to contribute to bone metabolism. In this study, the relationships of intakes of n-3 and omega-6 (n-6) fatty acids with PBM were evaluated in Japanese female subjects. METHODS A total of 275 healthy female subjects (19-25 years) having PBM were enrolled, and lumbar and total hip bone mineral density (BMD) and bone metabolic parameters were measured. Dietary intakes of total energy, total n-3 fatty acids, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and total n-6 fatty acids were assessed by a self-administered questionnaire. Physical activity information was also assessed. RESULTS The mean ± SD age was 20.6 ± 1.4 years, and BMI was 21.2 ± 2.7 kg/m2. BMI and serum bone alkaline phosphatase contributed significantly to lumbar BMD on multiple regression analysis. Intake of n-3 fatty acids and physical activity were also significantly related to total hip BMD. Using EPA or DHA instead of total n-3 fatty acids in the model did not result in a significant result. CONCLUSION Adequate total n-3 fatty acid intake may help maximize PBM at the hip.
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Affiliation(s)
- T Kuroda
- Public Health Research Foundation, 1-1-7 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan.
| | - H Ohta
- Clinical Medical Research Center, International University of Health and Welfare, Women's Medical Center, Sanno Medical Center, 8-5-35 Akasaka, Minato-ku, Tokyo, 107-0052, Japan
| | - Y Onoe
- Department of Obstetrics and Gynecology, Tokyo Women's Medical University Hospital, 8-1 Kawadacho, Shinjuku-ku, Tokyo, 162-8666, Japan
| | - N Tsugawa
- Laboratory of Public Health, Department of Health and Nutrition, Osaka Shoin Women's University, 4-2-26 Hishiyanishi, Higashi-Osaka, Osaka, 577-8550, Japan
| | - M Shiraki
- Department of Internal Medicine, Research Institute and Practice for Involutional Diseases, 1610-1 Meisei, Misato, Azumino, Nagano, 399-8101, Japan
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11
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Shen G, Ren H, Qiu T, Zhang Z, Zhao W, Yu X, Huang J, Tang J, Liang D, Yao Z, Yang Z, Jiang X. Mammalian target of rapamycin as a therapeutic target in osteoporosis. J Cell Physiol 2017; 233:3929-3944. [PMID: 28834576 DOI: 10.1002/jcp.26161] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 08/21/2017] [Indexed: 12/19/2022]
Abstract
The mechanistic target of rapamycin (mTOR) plays a key role in sensing and integrating large amounts of environmental cues to regulate organismal growth, homeostasis, and many major cellular processes. Recently, mounting evidences highlight its roles in regulating bone homeostasis, which sheds light on the pathogenesis of osteoporosis. The activation/inhibition of mTOR signaling is reported to positively/negatively regulate bone marrow mesenchymal stem cells (BMSCs)/osteoblasts-mediated bone formation, adipogenic differentiation, osteocytes homeostasis, and osteoclasts-mediated bone resorption, which result in the changes of bone homeostasis, thereby resulting in or protect against osteoporosis. Given the likely importance of mTOR signaling in the pathogenesis of osteoporosis, here we discuss the detailed mechanisms in mTOR machinery and its association with osteoporosis therapy.
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Affiliation(s)
- Gengyang Shen
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Hui Ren
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ting Qiu
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhida Zhang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Wenhua Zhao
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiang Yu
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jinjing Huang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jingjing Tang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - De Liang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhensong Yao
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhidong Yang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaobing Jiang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China.,Laboratory Affiliated to National Key Discipline of Orthopaedic and Traumatology of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China
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12
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Abstract
PURPOSE OF REVIEW This study aims to describe bone marrow fat changes in diabetes and to discuss the potential role of marrow fat in skeletal fragility. RECENT FINDINGS Advances in non-invasive imaging have facilitated marrow fat research in humans. In contrast to animal studies which clearly demonstrate higher levels of marrow fat in diabetes, human studies have shown smaller and less certain differences. Marrow fat has been reported to correlate with A1c, and there may be a distinct marrow lipid saturation profile in diabetes. Greater marrow fat is associated with impaired skeletal health. Marrow fat may be a mediator of skeletal fragility in diabetes. Circulating lipids, growth hormone alterations, visceral adiposity, and hypoleptinemia have been associated with greater marrow fat and may represent potential mechanisms for the putative effects of diabetes on marrow fat, although other factors likely contribute. Additional research is needed to further define the role of marrow fat in diabetic skeletal fragility and to determine whether marrow fat is a therapeutic target.
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Affiliation(s)
- Tiffany Y Kim
- University of California, San Francisco, 1700 Owens St, Room 349, San Francisco, CA, 94158, USA.
- San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA.
| | - Anne L Schafer
- University of California, San Francisco, 1700 Owens St, Room 349, San Francisco, CA, 94158, USA
- San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
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13
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Philippe C, Wauquier F, Landrier JF, Bonnet L, Miot-Noirault E, Rochefort GY, Sadoine J, Asrih M, Jornayvaz FR, Bernalier A, Coxam V, Wittrant Y. GPR40 mediates potential positive effects of a saturated fatty acid enriched diet on bone. Mol Nutr Food Res 2016; 61. [PMID: 27611773 DOI: 10.1002/mnfr.201600219] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 07/29/2016] [Accepted: 09/02/2016] [Indexed: 01/13/2023]
Abstract
SCOPE The stimulation of the free fatty acid receptor G-protein coupled receptor (GPR) 40 by GW9508 prevents bone loss by inhibiting osteoclast activity, both in vitro and in vivo. Here, we questioned whether the stimulation of the GPR40 receptor by dietary fatty acids may lead to the same beneficial effect on bone. METHODS AND RESULTS We investigated (i) the impact of a fatty acid enriched diet (high-fat diet [HFD]) on bone health in C57/BL6 female mice depending on (ii) the estrogen status (ovariectomy) and (iii) the genotype (GPR40+/+ or GPR40-/- ). Bone mineral density (BMD), body composition, weight, inflammation and bone remodeling parameters were monitored. HFD decreased BMD in HFD-SH-GPR40+/+ mice but OVX failed to further impact BMD in HFD-OVX-GPR40+/+ mice, while additional bone loss was observed in HFD-OVX-GPR40-/- animals. These data suggest that when stimulated by fatty acid enriched diets GPR40 contributes to counteract ovariectomy-induced bone alteration. The sparing effect is supported by the modulation of both the osteoprotegerin/receptor activator of nuclear factor kappa-B ligand (OPG/RANKL) ratio in blood stream and the expression level of inflammatory markers in adipose tissues. Bone preservation by GPR40 stimulation is dependent on the presence of long-chain saturated fatty acids. CONCLUSION GPR40 contributes to counter ovariectomy-induced bone loss in a context of saturated fatty acid enrichment.
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Affiliation(s)
- Claire Philippe
- INRA, UMR 1019, UNH, CRNH Auvergne, Clermont-Ferrand, France.,Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France.,Equipe Alimentation, Squelette et Métabolismes, Unité de Nutrition Humaine, Centre de Recherche INRA Auvergne Rhône Alpes, Site de Theix, 63122 Saint Genés Champanelle, France
| | - Fabien Wauquier
- INRA, UMR 1019, UNH, CRNH Auvergne, Clermont-Ferrand, France.,Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France.,Equipe Alimentation, Squelette et Métabolismes, Unité de Nutrition Humaine, Centre de Recherche INRA Auvergne Rhône Alpes, Site de Theix, 63122 Saint Genés Champanelle, France
| | - Jean-François Landrier
- INRA, UMR1260, Nutriments Lipidiques et Prévention des Maladies Métaboliques, Marseille, France.,Faculté de Médecine, Université de la Méditerranée Aix-Marseille 1 et 2, Marseille, France
| | - Lauriane Bonnet
- INRA, UMR1260, Nutriments Lipidiques et Prévention des Maladies Métaboliques, Marseille, France.,Faculté de Médecine, Université de la Méditerranée Aix-Marseille 1 et 2, Marseille, France
| | - Elisabeth Miot-Noirault
- Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France.,INSERM, UMR990, IMTV, Clermont-Ferrand, France
| | - Gaël Y Rochefort
- EA 2496 Pathologie, Imagerie et Biothérapies Orofaciales, UFR Odontologie, Université Paris Descartes and PIPA, PRES Sorbonne Paris Cité, Montrouge, France
| | - Jérémy Sadoine
- EA 2496 Pathologie, Imagerie et Biothérapies Orofaciales, UFR Odontologie, Université Paris Descartes and PIPA, PRES Sorbonne Paris Cité, Montrouge, France
| | - Mohamed Asrih
- Service d'Endocrinologie, Diabétologie et Métabolisme, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
| | - François R Jornayvaz
- Service d'Endocrinologie, Diabétologie et Métabolisme, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
| | | | - Véronique Coxam
- INRA, UMR 1019, UNH, CRNH Auvergne, Clermont-Ferrand, France.,Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France.,Equipe Alimentation, Squelette et Métabolismes, Unité de Nutrition Humaine, Centre de Recherche INRA Auvergne Rhône Alpes, Site de Theix, 63122 Saint Genés Champanelle, France
| | - Yohann Wittrant
- INRA, UMR 1019, UNH, CRNH Auvergne, Clermont-Ferrand, France.,Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France.,Equipe Alimentation, Squelette et Métabolismes, Unité de Nutrition Humaine, Centre de Recherche INRA Auvergne Rhône Alpes, Site de Theix, 63122 Saint Genés Champanelle, France
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14
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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: 0.2] [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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15
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Abstract
Osteoporosis is a global health problem that leads to an increased incidence of fragility fracture. Recent dietary patterns of Western populations include higher than recommended intakes of n-6 (ω-6) polyunsaturated fatty acids (PUFAs) relative to n-3 (ω-3) PUFAs that may result in a chronic state of sterile whole body inflammation. Findings from human bone cell culture experiments have revealed both benefits and detriments to bone-related outcomes depending on the quantity and source of PUFAs. Findings from observational and randomized controlled trials suggest that higher fatty fish intake is strongly linked with reduced risk of fragility fracture. Moreover, human studies largely support a greater intake of total PUFAs, total n-6 (ω-6) fatty acid, and total n-3 (ω-3) fatty acid for higher bone mineral density and reduced risk of fragility fracture. Less consistent evidence has been observed when investigating the role of long chain n-3 (ω-3) PUFAs or the ratio of n-6 (ω-6) PUFAs to n-3 (ω-3) PUFAs. Aspects to consider when interpreting the current literature involve participant characteristics, study duration, diet assessment tools, and the primary outcome measure.
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Affiliation(s)
- Amanda B Longo
- Center for Bone and Muscle Health, and Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, St. Catharines, Canada
| | - Wendy E Ward
- Center for Bone and Muscle Health, and Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, St. Catharines, Canada
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16
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Bosetti M, Sabbatini M, Calarco A, Borrone A, Peluso G, Cannas M. Effect of retinoic acid and vitamin D3 on osteoblast differentiation and activity in aging. J Bone Miner Metab 2016; 34:65-78. [PMID: 25691285 DOI: 10.1007/s00774-014-0642-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 11/24/2014] [Indexed: 02/04/2023]
Abstract
Several studies have evidenced that in aging, osteoblast functional activity is impaired: osteoblast proliferation is slower and matrix deposition is less efficient. Because peroxisome-proliferator-activated receptor γ2 (PPARγ2) and fatty acids are important inhibitory signals in osteoblast development, we have investigated in human primary osteoblasts obtained from patients of different ages, the influence of retinoic acid and calcitriol on enzymes involved in differentiative (PPARγ2, β-catenin, and insulin-like growth factor 1) and metabolic (carnitine palmitoyltransferase 1) intracellular pathways, and on transglutaminase 2, as enzyme fundamental for stabilizing the newly deposited extracellular matrix in bone. Retinoic acid and calcitriol influenced, respectively, proliferation and differentiation of osteoblasts, and an increase in PPARγ2 expression was observed following retinoic acid administration, whereas a decrease was observed following calcitriol administration. Aging widely influenced all parameters analyzed (the proliferation, differentiation, and new matrix deposition are significantly reduced in aged osteoblasts), with the exception of PPARγ2, which we found to be constitutively overexpressed and not modulated by retinoic acid or calcitriol administration. Our findings show the impaired ability of aged osteoblasts to perform adequate functional response and draw attention to the therapeutic approaches for bone healing in elderly patients.
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Affiliation(s)
- Michela Bosetti
- Pharmacy Science Department, University of Eastern Piedmont, Alessandria, Novara, Vercelli, Italy
| | - Maurizio Sabbatini
- Department of Health Sciences, University of Eastern Piedmont, Alessandria, Novara, Vercelli, Italy.
- Dipartmento Scienze della Salute, Università del Piemonte Orientale "Amedeo Avogadro", via Solaroli 17, 28100, Novara, Italy.
| | - Anna Calarco
- Institute of Protein Biochemistry, CNR, Naples, Italy
| | - Alessia Borrone
- Department of Health Sciences, University of Eastern Piedmont, Alessandria, Novara, Vercelli, Italy
| | | | - Mario Cannas
- Department of Health Sciences, University of Eastern Piedmont, Alessandria, Novara, Vercelli, Italy
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17
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Philippe C, Wauquier F, Lyan B, Coxam V, Wittrant Y. GPR40, a free fatty acid receptor, differentially impacts osteoblast behavior depending on differentiation stage and environment. Mol Cell Biochem 2015; 412:197-208. [DOI: 10.1007/s11010-015-2626-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 12/08/2015] [Indexed: 11/25/2022]
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18
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Wauquier F, Léotoing L, Philippe C, Spilmont M, Coxam V, Wittrant Y. Pros and cons of fatty acids in bone biology. Prog Lipid Res 2015; 58:121-45. [PMID: 25835096 DOI: 10.1016/j.plipres.2015.03.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/06/2015] [Accepted: 03/23/2015] [Indexed: 12/12/2022]
Abstract
Despite the growing interest in deciphering the causes and consequences of obesity-related disorders, the mechanisms linking fat intake to bone behaviour remain unclear. Since bone fractures are widely associated with increased morbidity and mortality, most notably in elderly and obese people, bone health has become a major social and economic issue. Consistently, public health system guidelines have encouraged low-fat diets in order to reduce associated complications. However, from a bone point of view, mechanisms linking fat intake to bone alteration remain quite controversial. Thus, after more than a decade of dedicated studies, this timely review offers a comprehensive overview of the relationships between bone and fatty acids. Using clinical evidences as a starting-point to more complex molecular elucidation, this work highlights the complexity of the system and reveals that bone alteration that cannot be solved simply by taking ω-3 pills. Fatty acid effects on bone metabolism can be both direct and indirect and require integrated investigations. Furthermore, even at the level of a single cell, one fatty acid is able to trigger several different independent pathways (receptors, metabolites…) which may all have a say in the final cellular metabolic response.
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Affiliation(s)
- Fabien Wauquier
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France
| | - Laurent Léotoing
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France
| | - Claire Philippe
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France
| | - Mélanie Spilmont
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France
| | - Véronique Coxam
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France
| | - Yohann Wittrant
- INRA, UMR 1019, UNH, CRNH Auvergne, F-63009 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; Equipe Alimentation, Squelette et Métabolismes, France.
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19
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Nallamshetty S, Le PT, Wang H, Issacsohn MJ, Reeder DJ, Rhee EJ, Kiefer FW, Brown JD, Rosen CJ, Plutzky J. Retinaldehyde dehydrogenase 1 deficiency inhibits PPARγ-mediated bone loss and marrow adiposity. Bone 2014; 67:281-91. [PMID: 25064526 PMCID: PMC4209126 DOI: 10.1016/j.bone.2014.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 06/16/2014] [Accepted: 07/02/2014] [Indexed: 10/25/2022]
Abstract
PPARγ, a ligand-activated nuclear receptor, regulates fundamental aspects of bone homeostasis and skeletal remodeling. PPARγ-activating anti-diabetic thiazolidinediones in clinical use promote marrow adiposity, bone loss, and skeletal fractures. As such, delineating novel regulatory pathways that modulate the action of PPARγ, and its obligate heterodimeric partner RXR, may have important implications for our understanding and treatment of disorders of low bone mineral density. We present data here establishing retinaldehyde dehydrogenase 1 (Aldh1a1) and its substrate retinaldehyde (Rald) as novel determinants of PPARγ-RXR actions in the skeleton. When compared to wild type (WT) controls, retinaldehyde dehydrogenase-deficient (Aldh1a1(-/-)) mice were protected against bone loss and marrow adiposity induced by either the thiazolidinedione rosiglitazone or a high fat diet, both of which potently activate the PPARγ-RXR complex. Consistent with these results, Rald, which accumulates in vivo in Aldh1a1(-/-) mice, protects against rosiglitazone-mediated inhibition of osteoblastogenesis in vitro. In addition, Rald potently inhibits in vitro adipogenesis and osteoclastogenesis in WT mesenchymal stem cells (MSCs) and hematopoietic stem cells (HSCs) respectively. Primary Aldh1a1(-/-) HSCs also demonstrate impaired osteoclastogenesis in vitro compared to WT controls. Collectively, these findings identify Rald and retinoid metabolism through Aldh1a1 as important novel modulators of PPARγ-RXR transactivation in the marrow niche.
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Affiliation(s)
- Shriram Nallamshetty
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Phuong T. Le
- Center for Clinical & Translational Research, Maine Medical Center Research Institute, Scarborough, Maine
| | - Hong Wang
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Maya J. Issacsohn
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - David J. Reeder
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Eun-Jung Rhee
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Florian W. Kiefer
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jonathan D. Brown
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Clifford J. Rosen
- Center for Clinical & Translational Research, Maine Medical Center Research Institute, Scarborough, Maine
- Corresponding authors. Address all correspondence and requests for reprints to: Jorge Plutzky, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 77 Ave. Louis Pasteur, NRB 742, Boston, Massachusetts 02115. Telephone: 617-525-4360 Fax: 617-525-4366
| | - Jorge Plutzky
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
- Corresponding authors. Address all correspondence and requests for reprints to: Jorge Plutzky, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 77 Ave. Louis Pasteur, NRB 742, Boston, Massachusetts 02115. Telephone: 617-525-4360 Fax: 617-525-4366
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Sun H, Kim JK, Mortensen R, Mutyaba LP, Hankenson KD, Krebsbach PH. Osteoblast-targeted suppression of PPARγ increases osteogenesis through activation of mTOR signaling. Stem Cells 2014; 31:2183-92. [PMID: 23766271 DOI: 10.1002/stem.1455] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 05/03/2013] [Accepted: 05/21/2013] [Indexed: 01/21/2023]
Abstract
Nuclear receptor peroxisome proliferator-activated receptor-γ (PPARγ) is an essential transcription factor for adipocyte differentiation. In mesenchymal stem cells, PPARγ has been assumed to play a negative role in osteoblastic differentiation, by working in an adipogenesis dependent manner, due to the reciprocal relationship between osteoblast and adipocyte differentiation. However, the direct role of PPARγ in osteoblast function is not fully understood, due in part to inadequate model systems. Here, we describe an adenoviral-mediated PPARγ knockout system in which suppression of PPARγ in mesenchymal stem cells enhanced osteoblast differentiation and inhibited adipogenesis in vitro. Consistent with this in vitro observation, lipoatrophic A-ZIP/F1 mice, which do not form adipocytes, displayed a phenotype in which both cortical and trabecular bone was significantly increased compared with wild-type mice. We next developed an inducible osteoblast-targeted PPARγ knockout (Osx Cre/flox- PPARγ) mouse to determine the direct role of PPARγ in bone formation. Data from both in vitro cultures of mesenchymal stem cells and in vivo µCT analysis of bones suggest that suppression of PPARγ activity in osteoblasts significantly increased osteoblast differentiation and trabecular number. Endogenous PPARγ in mesenchymal stem cells and osteoblasts strongly inhibited Akt/mammalian target of rapamycin (mTOR)/p70S6k activity and led to decreased osteoblastic differentiation. Therefore, we conclude that PPARγ modulates osteoblast differentiation and bone formation through both direct and indirect mechanisms. The direct mode, as shown here, involves PPARγ regulation of the mTOR pathway, while the indirect pathway is dependent on the regulation of adipogenesis.
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Affiliation(s)
- Hongli Sun
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
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21
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Esmaeli S, Allameh A, Soleimani M, Rahbarizadeh F, Frouzandeh-Moghadam M. The role of albumin and PPAR-α in differentiation-dependent change of fatty acid profile during differentiation of mesenchymal stem cells to hepatocyte-like cells. Cell Biochem Funct 2014; 32:410-9. [PMID: 24585388 DOI: 10.1002/cbf.3031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 01/15/2014] [Accepted: 01/23/2014] [Indexed: 01/01/2023]
Abstract
Differentiation of mesenchymal stem cells (MSCs) to hepatocyte-like cells is associated with morphological and biological changes. In this study, the effect of hepatogenic differentiation on fatty acid profile and the expression of proliferator-activated receptors-α (PPAR-α) have been studied. For this purpose, MSCs isolated from human umbilical cord were differentiated into hepatocyte-like cells on selective culture media. The morphological and biochemical changes, PPAR-α expression and reactive oxygen species (ROS) levels were studied during the differentiation process. Besides, the cells were processed to determine changes in fatty acid profile using gas chromatography analysis. The results showed that hepatic differentiation of the MSCs is associated with a decrease in major polyunsaturated fatty acids in mature hepatocytes, whereas there was an increase in the saturated fatty acid (SFA) levels during hepatocyte maturation. The differentiation-dependent shift in the ratio of SFA/USFA was associated with changes in albumin and PPAR-α expression, whereas changes in fatty acid profile were independent of ROS production and lipid peroxidation in differentiating cells. In conclusion, these data may suggest that hepatocyte formation during the stem cell differentiation is associated with a shift in the fatty acid profile that is probably a normal phenomenon in hepatogenic differentiation of the MSCs.
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Affiliation(s)
- Shahnaz Esmaeli
- Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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22
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Wu H, Li L, Ma Y, Chen Y, Zhao J, Lu Y, Shen P. Regulation of selective PPARγ modulators in the differentiation of osteoclasts. J Cell Biochem 2013; 114:1969-77. [PMID: 23494891 DOI: 10.1002/jcb.24534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 02/28/2013] [Indexed: 01/16/2023]
Abstract
Diabetes is the most common chronic disease in the world and causes complications with many diseases, such as heart disease and osteoporosis. Osteoporosis is a systemic bone disease characterized by imbalance in bone resorption and bone formation. Osteoclast is type of bone cell that functions in bone resorption and plays a critical role in bone remodeling. Rosiglitazone and pioglitazone, which belong to Thiazolidinediones(TZDs), are commonly used antidiabetic drugs. As PPARγ full agonists, they can activate PPARγ in a ligand-dependent way. Recent studies indicate that these PPARγ full agonists have some side effects, such as weight gain and bone loss, which may increase the risk of osteoporosis. In contrast, selective PPARγ Modulators (SPPARγMs) are novel PPARγ ligands that can activate PPARγ in different ways and lead to distinct downstream genes. Mice bone marrow cells were stimulated with recombinant mouse RANKL and M-CSF to generate osteoclasts. To determine the effect on osteoclasts formation, PPARγ ligands (Rosiglitazone, Fmoc-L-Leu, and Telmisartan) were added at the beginning of the culture. Rosiglitazone significantly increased the differentiation of multinucleated osteoclasts, while osteoclasts formation triggered by SPPARγMs was much less than that displayed by rosiglitazone. We found that the enhancement of PPARγ ligands may be associated with TRAF6 and downstream ERK signal pathway. We also demonstrated osteoclasts show characteristic M2 phenotype and can be further promoted by PPARγ ligands, especially rosiglitazone. In conclusion, reduced osteoclasts differentiation characteristic of SPPARγMs highlights SPPARγMs potential as therapeutic targets in diabetes, versus traditional antidiabetic drugs.
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Affiliation(s)
- Haochen Wu
- The State Key Laboratory of Pharmaceutical Biotechnology, Model Animal Research Center MARC, Nanjing University, Nanjing, 210093, China
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Chabbi-Achengli Y, Launay JM, Maroteaux L, de Vernejoul MC, Collet C. Serotonin 2B receptor (5-HT2B R) signals through prostacyclin and PPAR-ß/δ in osteoblasts. PLoS One 2013; 8:e75783. [PMID: 24069449 PMCID: PMC3775737 DOI: 10.1371/journal.pone.0075783] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 08/20/2013] [Indexed: 01/29/2023] Open
Abstract
Osteoporosis is due to an imbalance between decreased bone formation by osteoblasts and increased resorption by osteoclasts. Deciphering factors controlling bone formation is therefore of utmost importance for the understanding and the treatment of osteoporosis. Our previous in vivo results showed that bone formation is reduced in the absence of the serotonin receptor 5-HT2B, causing impaired osteoblast proliferation, recruitment, and matrix mineralization. In this study, we investigated the signaling pathways responsible for the osteoblast defect in 5-HT2BR(-/-) mice. Notably, we investigated the phospholipase A2 pathway and synthesis of eicosanoids in 5-HT2BR(-/-) compared to wild type (WT) osteoblasts. Compared to control osteoblasts, the lack of 5-HT2B receptors was only associated with a 10-fold over-production of prostacyclin (PGI2). Also, a specific prostacyclin synthase inhibitor (U51605) rescued totally osteoblast aggregation and matrix mineralization in the 5-HT2BR(-/-) osteoblasts without having any effect on WT osteoblasts. Prostacyclin is the endogenous ligand of the nuclear peroxisome proliferator activated receptor ß/δ (PPAR-ß/δ), and its inhibition in 5-HT2BR(-/-) cells rescued totally the alkaline phosphatase and osteopontin mRNA levels, cell-cell adhesion, and matrix mineralization. We conclude that the absence of 5-HT2B receptors leads to the overproduction of prostacyclin, inducing reduced osteoblast differentiation due to PPAR-ß/δ -dependent target regulation and defective cell-cell adhesion and matrix mineralization. This study thus reveals a previously unrecognized cell autonomous osteoblast defect in the absence of 5-HT2BR and highlights a new pathway linking 5-HT2B receptors and nuclear PPAR- ß/δ via prostacyclin.
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Affiliation(s)
- Yasmine Chabbi-Achengli
- INSERM UMR606, Hôpital Lariboisière, Paris, France
- Université Paris Diderot Sorbonne Paris Cité, Paris France
| | - Jean-Marie Launay
- Service de Biochimie, Hôpital Lariboisière, Paris, France
- INSERM U942, Hôpital Lariboisière, Paris, France
| | - Luc Maroteaux
- INSERM UMR-S839, Institut du Fer à Moulin, Paris, France
| | | | - Corinne Collet
- INSERM UMR606, Hôpital Lariboisière, Paris, France
- Service de Biochimie, Hôpital Lariboisière, Paris, France
- * E-mail:
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Mangano KM, Sahni S, Kerstetter JE, Kenny AM, Hannan MT. Polyunsaturated fatty acids and their relation with bone and muscle health in adults. Curr Osteoporos Rep 2013; 11:203-12. [PMID: 23857286 PMCID: PMC3884553 DOI: 10.1007/s11914-013-0149-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Age-related bone and muscle loss are major public health problems. Investigational therapies to reduce these losses include anti-inflammatory dietary supplementations, such as polyunsaturated fatty acids (PUFA). Surprisingly, this topic has received little attention in the osteoporosis community. Recent research highlights the role of PUFA in inflammatory regulation of bone remodeling via cellular pathways. Emerging research suggests significant roles for PUFA in reducing bone and muscle loss with aging; however, findings are conflicted for PUFA and fracture risk. Limited studies suggest a relation between higher omega-3 FA and better muscle/bone in older adults. This review highlights new research since 2008 and synthesizes our current understanding of PUFA in relation to bone and muscle. Across study designs, evidence indicates that PUFA has positive effects upon bone. As data are sparse, future clinical trials and prospective studies are important to determine the long term benefits of PUFA supplementation upon bone and muscle outcomes.
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Affiliation(s)
- Kelsey M Mangano
- Institute for Aging Research, Hebrew SeniorLife, 1200 Centre St, Boston, MA, 02131, USA
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25
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Casado-Díaz A, Santiago-Mora R, Dorado G, Quesada-Gómez JM. The omega-6 arachidonic fatty acid, but not the omega-3 fatty acids, inhibits osteoblastogenesis and induces adipogenesis of human mesenchymal stem cells: potential implication in osteoporosis. Osteoporos Int 2013; 24:1647-61. [PMID: 23104199 DOI: 10.1007/s00198-012-2138-z] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2012] [Accepted: 09/01/2012] [Indexed: 12/21/2022]
Abstract
UNLABELLED Arachidonic fatty acid (AA) induces adipogenesis in human mesenchymal stem cells cultures, and high concentrations inhibit osteoblastogenesis; whereas eicosapentaenoic and docosahexaenoic fatty acids do not induce adipogenesis and do not inhibit osteoblastogenesis. In mesenchymal stem cells, omega-6 arachidonic polyunsaturated fatty acid promotes the differentiation of adipocytes and inhibits the osteoblast differentiation. While omega-3 fatty acids do not affect the adipogenic differentiation their effects on osteoblastogenesis are less relevant. An increased ratio of omega-3/omega-6 fatty acid consumption can prevent bone mass loss. INTRODUCTION Consumption of omega-3 may protect against osteoporosis since they may inhibit osteoclastogenesis. However, with aging, MSC in bone marrow are increasingly differentiated into adipocytes, reducing the number of osteoblasts. Products derived from omega-6 and omega-3 metabolism may affect MSC differentiation into osteoblasts and adipocytes. METHODS Human MSC have been differentiated into osteoblasts or adipocytes in the presence of omega-6 (AA), or omega-3 (DHA and EPA), and osteoblastic and adipocytic markers have been analyzed. RESULTS AA decreases the expression of osteogenic markers and the osteoprotegerin/receptor activator of nuclear factor kappa β ligand gene expression ratio (opg/rankl). High concentrations of AA inhibit the mineralization and cause the appearance of adipocytes in MSC differentiating into osteoblasts to a higher extent than DHA or EPA. In MSC differentiated into adipocytes, AA increases adipogenesis, while DHA and EPA do not affect it. AA caused the appearance of adipocytes in undifferentiated MSC. The lipoxygenase gene (alox15b) is induced by omega-3 in MSC induced to osteoblasts, and by omega-6 in MSC induced to adipocytes. CONCLUSIONS An increase in the intake of omega-3 respect to omega-6 may provide protection against the loss of bone mass, since omega-6 favors the osteoclastic activity by diminishing the opg/rankl gene expression in osteoblasts and promotes MSC differentiation into adipocytes, thus diminishing the production of osteoblasts.
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Affiliation(s)
- A Casado-Díaz
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Hospital Universitario Reina Sofía, RETICEF, Avda. Menéndez Pidal s/n, 14004 Córdoba, Spain
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26
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Fazeli PK, Horowitz MC, MacDougald OA, Scheller EL, Rodeheffer MS, Rosen CJ, Klibanski A. Marrow fat and bone--new perspectives. J Clin Endocrinol Metab 2013; 98:935-45. [PMID: 23393168 PMCID: PMC3590487 DOI: 10.1210/jc.2012-3634] [Citation(s) in RCA: 319] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
CONTEXT There is growing interest in the relationship between bone mineral density, bone strength, and fat depots. Marrow adipose tissue, a well-established component of the marrow environment, is metabolically distinct from peripheral fat depots, but its functional significance is unknown. OBJECTIVE In this review, we discuss animal and human data linking the marrow adipose tissue depot to parameters of bone density and integrity as well as the potential significance of marrow adipose tissue in metabolic diseases associated with bone loss, including type 1 diabetes mellitus and anorexia nervosa. Potential hormonal determinants of marrow adipose tissue are also discussed. CONCLUSIONS We conclude that whereas most animal and human data demonstrate an inverse association between marrow adipose tissue and measures of bone density and strength, understanding the functional significance of marrow adipose tissue and its hormonal determinants will be critical to better understanding its role in skeletal integrity and the role of marrow adipose tissue in the pathophysiology of bone loss.
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Affiliation(s)
- Pouneh K Fazeli
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
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27
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Wauquier F, Philippe C, Léotoing L, Mercier S, Davicco MJ, Lebecque P, Guicheux J, Pilet P, Miot-Noirault E, Poitout V, Alquier T, Coxam V, Wittrant Y. The free fatty acid receptor G protein-coupled receptor 40 (GPR40) protects from bone loss through inhibition of osteoclast differentiation. J Biol Chem 2013; 288:6542-51. [PMID: 23335512 DOI: 10.1074/jbc.m112.429084] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The mechanisms linking fat intake to bone loss remain unclear. By demonstrating the expression of the free fatty acid receptor G-coupled protein receptor 40 (GPR40) in bone cells, we hypothesized that this receptor may play a role in mediating the effects of fatty acids on bone remodeling. Using micro-CT analysis, we showed that GPR40(-/-) mice exhibit osteoporotic features suggesting a positive role of GPR40 on bone density. In primary cultures of bone marrow, we showed that GW9508, a GRP40 agonist, abolished bone-resorbing cell differentiation. This alteration of the receptor activator of NF-κB ligand (RANKL)-induced osteoclast differentiation occurred via the inhibition of the nuclear factor κB (NF-κB) signaling pathway as demonstrated by decrease in gene reporter activity, inhibitor of κB kinase (IKKα/β) activation, inhibitor of κB (IkBα) phosphorylation, and nuclear factor of activated T cells 1 (NFATc1) expression. The GPR40-dependent effect of GW9508 was confirmed using shRNA interference in osteoclast precursors and GPR40(-/-) primary cell cultures. In addition, in vivo administration of GW9508 counteracted ovariectomy-induced bone loss in wild-type but not GPR40(-/-) mice, enlightening the obligatory role of the GPR40 receptor. Then, in a context of growing prevalence of metabolic and age-related bone disorders, our results demonstrate for the first time in translational approaches that GPR40 is a relevant target for the design of new nutritional and therapeutic strategies to counter bone complications.
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Affiliation(s)
- Fabien Wauquier
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1019, Unité de Nutrition Humaine, Centre de Recherche en Nutrition Humaine Auvergne, F-63009 Clermont-Ferrand, France
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28
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Niemeier A, Schinke T, Heeren J, Amling M. The role of apolipoprotein E in bone metabolism. Bone 2012; 50:518-24. [PMID: 21798384 DOI: 10.1016/j.bone.2011.07.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 06/23/2011] [Accepted: 07/08/2011] [Indexed: 10/18/2022]
Abstract
Apolipoprotein E (apoE) is a major structural apolipoprotein of several lipoprotein classes. Over the last 13 years, numerous studies have focused on the question whether human apoE affects bone phenotypes and, more recently, whether apoE regulates bone metabolism in mice. Here, we first provide a brief background introduction into the structure, established physiological and pathophysiological functions of apoE, and will then discuss the new aspects of the emerging role of apoE in bone.
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Affiliation(s)
- Andreas Niemeier
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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29
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Lechler P, Schaumburger J, Köck FX, Balakrishnan S, Doukas S, Prantl L, Grifka J. The oncofetal gene survivin promotes cell proliferation and survival in primary human osteoblastic cells. Calcif Tissue Int 2011; 89:211-20. [PMID: 21674243 DOI: 10.1007/s00223-011-9508-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 05/25/2011] [Indexed: 10/18/2022]
Abstract
Survivin, the smallest member of the inhibitor of apoptosis gene family, is critical for the regulation of mitosis and maintenance of cell viability during embryonic development and cancer, while not being detectable in most adult differentiated tissues. We know little about whether survivin plays any physiological or pathophysiological role in the adult musculoskeletal system. We studied the expression of survivin in primary human osteoblastic cells and its biological functions in vitro. Survivin was detected by immunoblotting and real-time PCR. Subcellular localization was analyzed by immunofluorescence. Transfection of siRNA and plasmids coding for wild-type survivin was performed to study survivin function, i.e., proliferation and apoptosis assays. Survivin mRNA and protein are expressed in primary human osteoblastic cells. During interphase survivin localizes predominantly to the cytoplasmic compartment, which is relevant for the organization of the spindle apparatus during mitosis. Survivin knockdown resulted in an arrest of the cell cycle at the G(2)/M phase and increased rates of apoptosis. Elevated levels of survivin in primary human osteoblasts enhanced proliferation and cell viability. Taken together, we demonstrate for the first time that survivin is expressed in primary human osteoblastic cells on the mRNA and protein levels. Our results indicate that survivin is a critical factor for cell division and cell viability in primary human osteoblastic cells. Learning more about survivin's role in human osteoblasts could be an important step toward understanding the complex processes involved in bone homeostasis and remodeling.
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Affiliation(s)
- Philipp Lechler
- Department of Orthopedic Surgery, University of Regensburg, Asklepios Klinikum Bad Abbach, Germany.
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30
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Ing SW, Belury MA. Impact of conjugated linoleic acid on bone physiology: proposed mechanism involving inhibition of adipogenesis. Nutr Rev 2011; 69:123-31. [PMID: 21348876 PMCID: PMC3814018 DOI: 10.1111/j.1753-4887.2011.00376.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Conjugated linoleic acid (CLA) supplementation decreases adipose mass and increases bone mass in mice. Recent clinical studies demonstrate a beneficial effect of CLA on reducing weight and adipose mass in humans. This article reviews possible biological mechanisms of action of CLA on bone metabolism, focusing on modulation of nuclear receptor peroxisome proliferator-activated receptor gamma activity to steer mesenchymal stem cell differentiation toward an adipose and away from an osteoblast lineage. Clinical studies of the effects of CLA on bone mass and clinical implications of the effects of CLA on bone health in humans are summarized and discussed.
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Affiliation(s)
- Steven W Ing
- Division of Endocrinology, Diabetes, & Metabolism, Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, Ohio 43210-1296, USA.
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Kruger M, Coetzee M, Haag M, Weiler H. Long-chain polyunsaturated fatty acids: Selected mechanisms of action on bone. Prog Lipid Res 2010; 49:438-49. [DOI: 10.1016/j.plipres.2010.06.002] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Indexed: 01/11/2023]
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32
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Yoshiko Y, Oizumi K, Hasegawa T, Minamizaki T, Tanne K, Maeda N, Aubin JE. A subset of osteoblasts expressing high endogenous levels of PPARgamma switches fate to adipocytes in the rat calvaria cell culture model. PLoS One 2010; 5:e11782. [PMID: 20668686 PMCID: PMC2909914 DOI: 10.1371/journal.pone.0011782] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Accepted: 06/28/2010] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Understanding fate choice and fate switching between the osteoblast lineage (ObL) and adipocyte lineage (AdL) is important to understand both the developmental inter-relationships between osteoblasts and adipocytes and the impact of changes in fate allocation between the two lineages in normal aging and certain diseases. The goal of this study was to determine when during lineage progression ObL cells are susceptible to an AdL fate switch by activation of endogenous peroxisome proliferator-activated receptor (PPAR)gamma. METHODOLOGY/PRINCIPAL FINDINGS Multiple rat calvaria cells within the ObL developmental hierarchy were isolated by either fractionation on the basis of expression of alkaline phosphatase or retrospective identification of single cell-derived colonies, and treated with BRL-49653 (BRL), a synthetic ligand for PPARgamma. About 30% of the total single cell-derived colonies expressed adipogenic potential (defined cytochemically) when BRL was present. Profiling of ObL and AdL markers by qRT-PCR on amplified cRNA from over 160 colonies revealed that BRL-dependent adipogenic potential correlated with endogenous PPARgamma mRNA levels. Unexpectedly, a significant subset of relatively mature ObL cells exhibited osteo-adipogenic bipotentiality. Western blotting and immunocytochemistry confirmed that ObL cells co-expressed multiple mesenchymal lineage determinants (runt-related transcription factor 2 (Runx2), PPARgamma, Sox9 and MyoD which localized in the cytoplasm initially, and only Runx2 translocated to the nucleus during ObL progression. Notably, however, some cells exhibited both PPARgamma and Runx2 nuclear labeling with concomitant upregulation of expression of their target genes with BRL treatment. CONCLUSIONS/SIGNIFICANCE We conclude that not only immature but a subset of relatively mature ObL cells characterized by relatively high levels of endogenous PPARgamma expression can be switched to the AdL. The fact that some ObL cells maintain capacity for adipogenic fate selection even at relatively mature developmental stages implies an unexpected plasticity with important implications in normal and pathological bone development.
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Affiliation(s)
- Yuji Yoshiko
- Department of Oral Growth and Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
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Jouzeau JY, Moulin D, Koufany M, Sebillaud S, Bianchi A, Netter P. [Pathophysiological relevance of peroxisome proliferators activated receptors (PPAR) to joint diseases - the pro and con of agonists]. ACTA ACUST UNITED AC 2008; 202:289-312. [PMID: 19094928 DOI: 10.1051/jbio:2008034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Peroxisome proliferators activated receptors (PPAR) are ligand-inducible nuclear transacting factors comprising three subtypes, PPARalpha, PPARbeta/delta and PPARgamma, which play a key role in lipids and glucose homeostasis. All PPAR subtypes have been identified in joint or inflammatory cells and their activation resulted in a transcriptional repression of pro-inflammatory cytokines (IL-1, TNFalpha), early inflammatory genes (NOS(2), COX-2, mPGES-1) or matrix metalloproteases (MMP-1, MMP-13), at least for the gamma subtype. PPAR full agonists were also shown to stimulate IL-1 receptor antagonist (IL-1Ra) production by cytokine-stimulated articular cells in a subtype-dependent manner. These anti-inflammatory and anti-catabolic properties were confirmed in animal models of joint diseases where PPAR agonists reduced synovial inflammation while preventing cartilage destruction or inflammatory bone loss, although many effects required much higher doses than needed to restore insulin sensitivity or to lower circulating lipid levels. However, these promising effects of PPAR full agonists were hampered by their ability to reduce the growth factor-dependent synthesis of extracellular matrix components or to induce chondrocyte apoptosis, by the possible contribution of immunosuppressive properties to their anti-arthritic effects, by the increased adipocyte differentiation secondary to prolonged stimulation of PPARgamma, and by a variable contribution of PPAR subtypes depending on the system. Clinical data are scarce in rheumatoid arthritis (RA) patients whereas thousands of patients worldwilde, treated with PPAR agonists for type 2 diabetes or dyslipidemia, are paradoxically prone to suffer from osteoarthritis (OA). Whereas high dosage of full agonists may expose RA patients to cardiovascular adverse effects, the proof of concept that PPAR agonists have therapeutical relevance to OA may benefit from an epidemiological follow-up of joint lesions in diabetic or hyperlipidemic patients treated for long periods of time with glitazones or fibrates. Additionally, cellular and animal studies are required to assess whether partial agonists of PPAR (SPPARMs) may preserve therapeutical properties with potentially less safety concern.
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Pirih FQ, Abayahoudian R, Elashoff D, Parhami F, Nervina JM, Tetradis S. Nuclear receptor profile in calvarial bone cells undergoing osteogenic versus adipogenic differentiation. J Cell Biochem 2008; 105:1316-26. [PMID: 18810760 PMCID: PMC5391254 DOI: 10.1002/jcb.21931] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Nuclear receptors (NRs) are key regulators of cell function and differentiation. We examined NR expression during osteogenic versus adipogenic differentiation of primary mouse calvarial osteoblasts (MOBs). MOBs were cultured for 21 days in osteogenic or adipogenic differentiation media. von Kossa and Oil Red O staining, and qRT-PCR of marker genes and 49 NRs were performed. PCR amplicons were subcloned to establish correct sequences and absolute standard curves. Forty-three NRs were detected at days 0-21. Uncentered average linkage hierarchical clustering identified four expression clusters: NRs (1) upregulated during osteogenic, but not adipogenic, differentiation, (2) upregulated in both conditions, with greater upregulation during adipogenic differentiation, (3) upregulated equally in both conditions, (4) downregulated during adipogenic, but not osteogenic, differentiation. One-way ANOVA with contrast revealed 20 NRs upregulated during osteogenic differentiation and 12 NRs upregulated during adipogenic differentiation. Two-way ANOVA demonstrated that 18 NRs were higher in osteogenic media, while 9 NRs were higher in adipogenic media. The time effect revealed 16 upregulated NRs. The interaction of condition with time revealed 6 NRs with higher expression rate during adipogenic differentiation and 3 NRs with higher expression rate during osteogenic differentiation. Relative NR abundance at days 0 and 21 were ranked. Basal ranking changed at least 5 positions for 13 NRs in osteogenic media and 9 NRs in adipogenic media. Osteogenic and adipogenic differentiation significantly altered NR expression in MOBs. These differences offer a fingerprint of cellular commitment and may provide clues to the underlying mechanisms of osteogenic versus adipogenic differentiation.
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Affiliation(s)
- Flavia Q. Pirih
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Rosette Abayahoudian
- Division of Diagnostic and Surgical Sciences, UCLA, Los Angeles, California 90095
| | - David Elashoff
- Department of Biostatistics/Nursing, UCLA, Los Angeles, California 90095
| | - Farhad Parhami
- Department of Cardiology, UCLA, Los Angeles, California 90095
| | | | - Sotirios Tetradis
- Division of Diagnostic and Surgical Sciences, UCLA, Los Angeles, California 90095
- Molecular Biology Institute, UCLA, Los Angeles, California 90095
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PPARdelta Agonism for the Treatment of Obesity and Associated Disorders: Challenges and Opportunities. PPAR Res 2008; 2008:125387. [PMID: 18989368 PMCID: PMC2577153 DOI: 10.1155/2008/125387] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2008] [Accepted: 09/03/2008] [Indexed: 12/13/2022] Open
Abstract
The prevalence of obesity in the USA and worldwide has reached epidemic proportions during the last two decades. Drugs currently available for the treatment of obesity provide no more than 5% placebo-adjusted weight loss and are associated with undesirable side effects. Peroxisome proliferator-activated receptor (PPAR) modulators offer potential benefits for the treatment of obesity and its associated complications but their development has been complicated by biological, technical, and regulatory challenges. Despite significant challenges, PPAR modulators are attractive targets for the treatment of obesity and could offer a viable alternative to the millions of patients who fail to lose weight following rigorous dieting and exercise protocols. In addition, PPAR modulators have the potential-added benefit of ameliorating the associated comorbidities.
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Niemeier A, Niedzielska D, Secer R, Schilling A, Merkel M, Enrich C, Rensen PCN, Heeren J. Uptake of postprandial lipoproteins into bone in vivo: impact on osteoblast function. Bone 2008; 43:230-237. [PMID: 18538644 DOI: 10.1016/j.bone.2008.03.022] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2007] [Revised: 03/17/2008] [Accepted: 03/19/2008] [Indexed: 01/08/2023]
Abstract
Dietary lipids and lipophilic vitamins are transported by postprandial lipoproteins and are required for bone metabolism. Despite that, it remains unknown whether bone cells are involved in the uptake of circulating postprandial lipoproteins in vivo. The current study was performed to investigate a putative participation of bone in the systemic postprandial lipoprotein metabolism in mice, to identify potentially involved cell type populations and to analyze whether lipoprotein uptake affects bone function in vivo. As a model for the postprandial state, chylomicron remnants (CR) were injected intravenously into mice. Next to the liver and compared to other organs, bone appeared to be the second most important organ for the clearance of radiolabeled CR particles from the circulation in vivo. In addition, uptake of radiolabeled CR by primary murine osteoblasts and hepatocytes was quantified to be in a similar range in vitro. A complementary approach with fluorescently labeled CR and immunohistochemical staining for apoE proved that intact CR particles were taken up into bone and liver. Electron microscopy localization studies of bone sections revealed CR uptake into sinusoidal endothelial cells, macrophages and osteoblasts. The relative amount of radiolabeled CR uptake into femoral cortical bone, representing predominantly osteoblasts, and bone marrow, representing predominantly non-osteoblast cells, was within the same range. Most importantly, the injection of vitamin K1-enriched CR resulted in an increase of the degree of osteocalcin carboxylation in vivo while total osteocalcin concentrations remained unaffected, giving functional proof that osteoblasts process CR in vivo. In conclusion, here we demonstrate that bone is involved in the postprandial lipoprotein metabolism in mice. Osteoblasts participate in CR clearance from the circulation, which has a direct impact on the secretory function of osteoblasts.
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Affiliation(s)
- Andreas Niemeier
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Dagmara Niedzielska
- Department of Biochemistry and Molecular Biology II: Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Rukiye Secer
- Department of Biochemistry and Molecular Biology II: Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Arndt Schilling
- Department of Trauma- Hand- and Reconstructive Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Martin Merkel
- Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Carlos Enrich
- Departament de Biologia Cellular, Facultat de Medicina, Universitat de Barcelona, Spain
| | - Patrick C N Rensen
- Department of General Internal Medicine, Endocrinology and Metabolic Diseases, Leiden University Medical Center, The Netherlands
| | - Joerg Heeren
- Department of Biochemistry and Molecular Biology II: Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Poulsen RC, Moughan PJ, Kruger MC. Long-chain polyunsaturated fatty acids and the regulation of bone metabolism. Exp Biol Med (Maywood) 2008; 232:1275-88. [PMID: 17959840 DOI: 10.3181/0704-mr-100] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The role of prostaglandin E2 (PGE2) in the regulation of bone remodeling is well established. There is increasing evidence that various long-chain polyunsaturated fatty acids (LCPUFAs), as well as nonprostanoid LCPUFA metabolites, also have critical roles in regulating bone metabolism and may have therapeutic potential in the management of postmenopausal osteoporosis. Although only the 18-carbon precursors for the n-3 and n-6 LCPUFAs are deemed "dietary essential," the ability of the body to convert these precursor fatty acids into the more highly unsaturated 20- and 22-carbon LCPUFAs decreases with aging, menopause, and various lifestyle factors (e.g., smoking). Increasing dietary LCPUFA intake increases tissue and blood LCPUFA concentrations, as well as the concentrations of their metabolites. Modification of dietary LCPUFA content, particularly increasing the intake of n-3 LCPUFAs, has been shown to minimize the decline in bone mass caused by menopause in women and ovariectomy in animal models. This review summarizes findings from both in vivo and in vitro studies and outlines the effects of LCPUFAs and their metabolites on calcium balance, osteoblastogenesis, osteoclastogenesis, and osteoblast and osteoclast function.
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Affiliation(s)
- Raewyn C Poulsen
- Institute of Food, Nutrition and Human Health, Private Bag 11-222, Palmerston North, New Zealand.
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38
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Hikiji H, Takato T, Shimizu T, Ishii S. The roles of prostanoids, leukotrienes, and platelet-activating factor in bone metabolism and disease. Prog Lipid Res 2008; 47:107-26. [DOI: 10.1016/j.plipres.2007.12.003] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2007] [Revised: 11/29/2007] [Accepted: 12/04/2007] [Indexed: 12/11/2022]
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Giaginis C, Tsantili-Kakoulidou A, Theocharis S. Peroxisome proliferator-activated receptors (PPARs) in the control of bone metabolism. Fundam Clin Pharmacol 2007; 21:231-44. [PMID: 17521292 DOI: 10.1111/j.1472-8206.2007.00486.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are ligand-activated nuclear transcription factors that regulate the storage and catabolism of dietary fats. PPARs constitute molecular targets for the treatment of human metabolic disorders, and also play a crucial role in inflammatory-related disease and cancer. Recent evidence has revealed the presence of three different PPAR isotypes (alpha, beta/delta, and gamma) in different cells of the bone tissue, as well as the possible role of PPAR ligands in bone turnover. In the present review, the latest knowledge of the expression of PPARs in bone tissue and the diverse effects of PPAR ligands on bone metabolism is summarized. PPARs, especially of the gamma isotype, could be targets for the treatment of diverse bone diseases such as osteoporosis and osteopenia related to either diabetes or aging.
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Affiliation(s)
- Costas Giaginis
- Department of Forensic Medicine and Toxicology, Medical School, University of Athens, 75 Mikras Asias Street, Athens 11527, Greece
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Irwin R, LaPres JJ, Kinser S, McCabe LR. Prolyl-hydroxylase inhibition and HIF activation in osteoblasts promotes an adipocytic phenotype. J Cell Biochem 2007; 100:762-72. [PMID: 17031858 DOI: 10.1002/jcb.21083] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Bone is a dynamic environment where cells sense and adapt to changes in nutrient and oxygen availability. Conditions associated with hypoxia in bone are also associated with bone loss. In vitro hypoxia (2% oxygen) alters gene expression in osteoblasts and osteocytes and induces cellular changes including the upregulation of hypoxia inducible factor (HIF) levels. Our studies show that osteoblasts respond to hypoxia (2% oxygen) by enhancing expression of genes associated with adipocyte/lipogenesis phenotype (C/EBPbeta, PPARgamma2, and aP2) and by suppressing expression of genes associated with osteoblast differentiation (alkaline phosphatase, AP). Hypoxia increased HIF protein levels, hypoxic response element (HRE) binding, and HRE-reporter activity. We also demonstrate that prolyl-hydroxylases 2 and 3 (PHD2, PHD3), one of the major factors coordinating HIF degradation under normoxic but not hypoxic conditions, are induced in osteoblasts under hypoxic conditions. To further determine the contribution of PHDs and upregulated HIF activity in modulating osteoblast phenotype, we treated osteoblasts with a PHD inhibitor, dimethyloxaloylglycine (DMOG), and maintained cells under normoxic conditions. Similar to hypoxic conditions, HRE reporter activity was increased and adipogenic gene expression was increased while osteoblastic genes were suppressed. Taken together, our findings indicate a role for PHDs and HIFs in the regulation of osteoblast phenotype.
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Affiliation(s)
- R Irwin
- Department of Physiology, Biomedical Imaging Research Center, Michigan State University, East Lansing, MI 48824, USA
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Giaginis C, Tsantili-Kakoulidou A, Theocharis S. Peroxisome proliferator-activated receptor-γ ligands as bone turnover modulators. Expert Opin Investig Drugs 2007; 16:195-207. [PMID: 17243939 DOI: 10.1517/13543784.16.2.195] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PPAR-gamma ligands are being used for the treatment of human metabolic disorders; they also exert anti-inflammatory and antineoplastic properties that are now being explored in clinical studies. Recent data have further extended the crucial role of PPAR-gamma and its ligands in bone turnover. This review summarises the latest knowledge of the expression of PPAR-gamma in bone tissue and the regulatory effect of diverse synthetic and natural PPAR-gamma ligands on bone formation and resorption. Taking into account the data so far, PPAR-gamma ligands seem to be able to contribute to the treatment of various bone disorders including osteoporosis, as well as diabetic and age-related osteopoenia.
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Affiliation(s)
- Costas Giaginis
- University of Athens, Department of Forensic Medicine and Toxicology, Medical School, 75 Mikras Asias Street, Athens 11527, Greece.
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