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Abstract
INTRODUCTION Preclinical, clinical, and population-based studies have provided evidence that anti-diabetic drugs affect bone metabolism and may affect the risk of fracture in diabetic patients. AREAS COVERED An overview of the skeletal effects of anti-diabetic drugs used in type 2 diabetes is provided. Searches on AdisInsight, PubMed, and Medline databases were conducted up to 1st July 2020. The latest evidence from randomized clinical trials and population-based studies on the skeletal safety of the most recent drugs (DPP-4i, GLP-1RA, and SGLT-2i) is provided. EXPERT OPINION Diabetic patients present with a higher risk of fracture for a given bone mineral density suggesting a role of bone quality in the etiology of diabetic fracture. Bone quality is difficult to assess in human clinical practice and the use of preclinical models provides valuable information on diabetic bone alterations. As several links have been established between bone and energy homeostasis, it is interesting to study the safety of anti-diabetic drugs on the skeleton. So far, evidence for the newest molecules suggests a neutral fracture risk, but further studies, especially in different types of patient populations (patients at risk or with history of cardiovascular disease, renal impairment, neuropathy) are required to fully appreciate this matter.
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Affiliation(s)
- Guillaume Mabilleau
- Groupe Etude Remodelage Osseux et biomatériaux, GEROM, UPRES EA 4658, UNIV Angers, SFR ICAT 4208, Institut de Biologie en Santé , Angers, France
- Service Commun d'Imagerie et Analyses Microscopiques, SCIAM, UNIV Angers, SFR ICAT 4208, Institut de Biologie en Santé , Angers, France
- Bone pathology unit, Angers University hospital , Angers Cedex, France
| | - Béatrice Bouvard
- Groupe Etude Remodelage Osseux et biomatériaux, GEROM, UPRES EA 4658, UNIV Angers, SFR ICAT 4208, Institut de Biologie en Santé , Angers, France
- Rheumatology department, Angers University Hospital , Angers Cedex, France
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Coumarin Ameliorates Impaired Bone Turnover by Inhibiting the Formation of Advanced Glycation End Products in Diabetic Osteoblasts and Osteoclasts. Biomolecules 2020; 10:biom10071052. [PMID: 32679814 PMCID: PMC7407361 DOI: 10.3390/biom10071052] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 06/24/2020] [Accepted: 07/13/2020] [Indexed: 12/17/2022] Open
Abstract
Accumulating evidence demonstrates that the risk of osteoporotic fractures increases in patients with diabetes mellitus. Thus, diabetes-induced bone fragility has recently been recognized as a diabetic complication. As the fracture risk is independent of the reduction in bone mineral density, deterioration in bone quality may be the main cause of bone fragility. Coumarin exists naturally in many plants as phenylpropanoids and is present in tonka beans in significantly high concentrations. This study investigated whether coumarin ameliorated the impaired bone turnover and remodeling under diabetic condition. The in vitro study employed murine macrophage Raw 264.7 cells differentiated to multinucleated osteoclasts with receptor activator of nuclear factor-κΒ ligand (RANKL) in the presence of 33 mM glucose and 1–20 μM coumarin for five days. In addition, osteoblastic MC3T3-E1 cells were exposed to 33 mM glucose for up to 21 days in the presence of 1–20 μM coumarin. High glucose diminished tartrate-resistant acid phosphatase activity and bone resorption in RANKL-differentiated osteoclasts, accompanying a reduction of cathepsin K induction and actin ring formation. In contrast, coumarin reversed the defective osteoclastogenesis in diabetic osteoclasts. Furthermore, high glucose diminished alkaline phosphatase activity and collagen type 1 induction of osteoblasts, which was strongly enhanced by submicromolar levels of coumarin to diabetic cells. Furthermore, coumarin restored the induction of RANK and osteoprotegerin in osteoclasts and osteoblasts under glucotoxic condition, indicating a tight coupling of osteoclastogenesis and osteoblastogenesis. Coumarin ameliorated the impaired bone turnover and remodeling in diabetic osteoblasts and osteoclasts by suppressing the interaction between advanced glycation end product (AGE) and its receptor (RAGE). Therefore, coumarin may restore optimal bone turnover of osteoclasts and osteoblasts by disrupting the hyperglycemia-mediated AGE–RAGE interaction.
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Activation of PPARs Modulates Signalling Pathways and Expression of Regulatory Genes in Osteoclasts Derived from Human CD14+ Monocytes. Int J Mol Sci 2019; 20:ijms20071798. [PMID: 30979019 PMCID: PMC6479901 DOI: 10.3390/ijms20071798] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/07/2019] [Accepted: 04/10/2019] [Indexed: 12/24/2022] Open
Abstract
Osteoclasts are the sole bone resorbing cell in the body and their over activity is key in the development of osteoporosis. Osteoclastogenesis is mediated by receptor activator of nuclear factor κB ligand (RANKL) signalling pathways. Unsaturated fatty acids (UFA) are known to inhibit osteoclastogenesis by targeting RANKL signalling. However, the mechanisms of action remain unclear. Peroxisome proliferator activated receptors (PPARs) are a family of nuclear receptors, with three known isoforms (PPAR-α, PPAR-β/δ and PPAR-γ), that are known to bind UFAs and are expressed in osteoclasts. In this study, we aimed to determine how different families of UFAs activate PPARs and how PPAR activation influences osteoclast signalling. Human CD14+ monocytes were seeded into cluster plates with RANKL and macrophage colony stimulating factor (M-CSF) in the presence of PPAR agonists or different types of UFAs. All the PPAR agonists were shown to upregulate the activity of their respective receptors. Polyunsaturated fatty acids increased PPAR-α to a greater extent than monounsaturated fatty acids (MUFAs), which favoured PPAR-β/δ activation. All PPAR agonists inhibited osteoclastogenesis. The activation of RANKL signalling pathways and expression of key osteoclast genes were downregulated by PPAR agonists. This study reveals that PPAR activation can inhibit osteoclastogenesis through modulation of RANKL signalling.
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Kalaitzoglou E, Fowlkes JL, Popescu I, Thrailkill KM. Diabetes pharmacotherapy and effects on the musculoskeletal system. Diabetes Metab Res Rev 2019; 35:e3100. [PMID: 30467957 PMCID: PMC6358500 DOI: 10.1002/dmrr.3100] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 11/14/2018] [Accepted: 11/19/2018] [Indexed: 12/13/2022]
Abstract
Persons with type 1 or type 2 diabetes have a significantly higher fracture risk than age-matched persons without diabetes, attributed to disease-specific deficits in the microarchitecture and material properties of bone tissue. Therefore, independent effects of diabetes drugs on skeletal integrity are vitally important. Studies of incretin-based therapies have shown divergent effects of different agents on fracture risk, including detrimental, beneficial, and neutral effects. The sulfonylurea class of drugs, owing to its hypoglycemic potential, is thought to amplify the risk of fall-related fractures, particularly in the elderly. Other agents such as the biguanides may, in fact, be osteo-anabolic. In contrast, despite similarly expected anabolic properties of insulin, data suggests that insulin pharmacotherapy itself, particularly in type 2 diabetes, may be a risk factor for fracture, negatively associated with determinants of bone quality and bone strength. Finally, sodium-dependent glucose co-transporter 2 inhibitors have been associated with an increased risk of atypical fractures in select populations, and possibly with an increase in lower extremity amputation with specific SGLT2I drugs. The role of skeletal muscle, as a potential mediator and determinant of bone quality, is also a relevant area of exploration. Currently, data regarding the impact of glucose lowering medications on diabetes-related muscle atrophy is more limited, although preclinical studies suggest that various hypoglycemic agents may have either aggravating (sulfonylureas, glinides) or repairing (thiazolidinediones, biguanides, incretins) effects on skeletal muscle atrophy, thereby influencing bone quality. Hence, the therapeutic efficacy of each hypoglycemic agent must also be evaluated in light of its impact, alone or in combination, on musculoskeletal health, when determining an individualized treatment approach. Moreover, the effect of newer medications (potentially seeking expanded clinical indication into the pediatric age range) on the growing skeleton is largely unknown. Herein, we review the available literature regarding effects of diabetes pharmacotherapy, by drug class and/or by clinical indication, on the musculoskeletal health of persons with diabetes.
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Affiliation(s)
- Evangelia Kalaitzoglou
- University of Kentucky Barnstable Brown Diabetes Center Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, USA
| | - John L Fowlkes
- University of Kentucky Barnstable Brown Diabetes Center Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, USA
| | - Iuliana Popescu
- University of Kentucky Barnstable Brown Diabetes Center Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, USA
| | - Kathryn M Thrailkill
- University of Kentucky Barnstable Brown Diabetes Center Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, USA
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Mousa A, Naderpoor N, Wilson K, Plebanski M, de Courten MPJ, Scragg R, de Courten B. Vitamin D supplementation increases adipokine concentrations in overweight or obese adults. Eur J Nutr 2019; 59:195-204. [PMID: 30649593 DOI: 10.1007/s00394-019-01899-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 01/08/2019] [Indexed: 01/26/2023]
Abstract
PURPOSE Vitamin D regulates adipokine production in vitro; however, clinical trials have been inconclusive. We conducted secondary analyses of a randomized controlled trial to examine whether vitamin D supplementation improves adipokine concentrations in overweight/obese and vitamin D-deficient adults. METHODS Sixty-five individuals with a BMI ≥ 25 kg/m2 and 25-hydroxyvitamin D (25(OH)D) ≤ 50 nmol/L were randomized to oral cholecalciferol (100,000 IU single bolus followed by 4,000 IU daily) or matching placebo for 16 weeks. We measured BMI, waist-to-hip ratio, % body fat (dual X-ray absorptiometry), serum 25(OH)D (chemiluminescent immunoassay) and total adiponectin, leptin, resistin, and adipsin concentrations (multiplex assay; flow cytometry). Sun exposure, physical activity, and diet were assessed using questionnaires. RESULTS Fifty-four participants completed the study (35M/19F; mean age = 31.9 ± 8.5 years; BMI = 30.9 ± 4.4 kg/m2). After 16 weeks, vitamin D supplementation increased 25(OH)D concentrations compared with placebo (57.0 ± 21.3 versus 1.9 ± 15.1 nmol/L, p < 0.001). There were no differences between groups for changes in adiponectin, leptin, resistin, or adipsin in unadjusted analyses (all p > 0.05). After adjustment for baseline values, season, sun exposure, and dietary vitamin D intake, there was a greater increase in adiponectin (β[95%CI] = 13.7[2.0, 25.5], p = 0.02) and leptin (β[95%CI] = 22.3[3.8, 40.9], p = 0.02) in the vitamin D group compared with placebo. Results remained significant after additional adjustment for age, sex, and % body fat (p < 0.02). CONCLUSIONS Vitamin D may increase adiponectin and leptin concentrations in overweight/obese and vitamin D-deficient adults. Further studies are needed to clarify the molecular interactions between vitamin D and adipokines and the clinical implications of these interactions in the context of obesity. CLINICAL TRIAL REGISTRATION clinicaltrials.gov: NCT02112721.
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Affiliation(s)
- Aya Mousa
- Monash Centre for Health Research and Implementation (MCHRI), School of Public Health and Preventive Medicine, Monash University, Level 1, 43-51 Kanooka Grove, Clayton, Melbourne, VIC, 3168, Australia
| | - Negar Naderpoor
- Monash Centre for Health Research and Implementation (MCHRI), School of Public Health and Preventive Medicine, Monash University, Level 1, 43-51 Kanooka Grove, Clayton, Melbourne, VIC, 3168, Australia
| | - Kirsty Wilson
- Department of Immunology and Pathology, Monash University, 89 Commercial Road, Melbourne, VIC, 3004, Australia
| | - Magdalena Plebanski
- Department of Immunology and Pathology, Monash University, 89 Commercial Road, Melbourne, VIC, 3004, Australia
- School of Health and Biomedical Sciences, RMIT University, 124 La Trobe St, Melbourne, VIC, 3000, Australia
| | - Maximilian P J de Courten
- Centre for Chronic Disease, Victoria University, 176 Furlong Road, St Albans, Melbourne, VIC, 3021, Australia
| | - Robert Scragg
- School of Population Health, University of Auckland, 261 Morrin Road, Glen Innes, Auckland, 1072, New Zealand
| | - Barbora de Courten
- Monash Centre for Health Research and Implementation (MCHRI), School of Public Health and Preventive Medicine, Monash University, Level 1, 43-51 Kanooka Grove, Clayton, Melbourne, VIC, 3168, Australia.
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Ortiz A, Gui J, Zahedi F, Yu P, Cho C, Bhattacharya S, Carbone CJ, Yu Q, Katlinski KV, Katlinskaya YV, Handa S, Haas V, Volk SW, Brice AK, Wals K, Matheson NJ, Antrobus R, Ludwig S, Whiteside TL, Sander C, Tarhini AA, Kirkwood JM, Lehner PJ, Guo W, Rui H, Minn AJ, Koumenis C, Diehl JA, Fuchs SY. An Interferon-Driven Oxysterol-Based Defense against Tumor-Derived Extracellular Vesicles. Cancer Cell 2019; 35:33-45.e6. [PMID: 30645975 PMCID: PMC6336114 DOI: 10.1016/j.ccell.2018.12.001] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 09/04/2018] [Accepted: 11/29/2018] [Indexed: 12/26/2022]
Abstract
Tumor-derived extracellular vesicles (TEV) "educate" healthy cells to promote metastases. We found that melanoma TEV downregulated type I interferon (IFN) receptor and expression of IFN-inducible cholesterol 25-hydroxylase (CH25H). CH25H produces 25-hydroxycholesterol, which inhibited TEV uptake. Low CH25H levels in leukocytes from melanoma patients correlated with poor prognosis. Mice incapable of downregulating the IFN receptor and Ch25h were resistant to TEV uptake, TEV-induced pre-metastatic niche, and melanoma lung metastases; however, ablation of Ch25h reversed these phenotypes. An anti-hypertensive drug, reserpine, suppressed TEV uptake and disrupted TEV-induced formation of the pre-metastatic niche and melanoma lung metastases. These results suggest the importance of CH25H in defense against education of normal cells by TEV and argue for the use of reserpine in adjuvant melanoma therapy.
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Affiliation(s)
- Angelica Ortiz
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jun Gui
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Farima Zahedi
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Pengfei Yu
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Christina Cho
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sabyasachi Bhattacharya
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Christopher J Carbone
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Qiujing Yu
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kanstantsin V Katlinski
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Yuliya V Katlinskaya
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Simran Handa
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Victor Haas
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Susan W Volk
- Department of Clinical Sciences & Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Angela K Brice
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kim Wals
- Department of Medicine, Cambridge Institute for Medical Research, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Nicholas J Matheson
- Department of Medicine, Cambridge Institute for Medical Research, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Robin Antrobus
- Department of Medicine, Cambridge Institute for Medical Research, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Sonja Ludwig
- Departments of Pathology, Immunology, and Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA; Department of Otorhinolaryngology, University of Duisburg-Essen, Duisburg, Germany
| | - Theresa L Whiteside
- Departments of Pathology, Immunology, and Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Cindy Sander
- Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Ahmad A Tarhini
- Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - John M Kirkwood
- Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Paul J Lehner
- Department of Medicine, Cambridge Institute for Medical Research, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Wei Guo
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Hallgeir Rui
- Department of Pathology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Andy J Minn
- Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Constantinos Koumenis
- Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - J Alan Diehl
- Department of Biochemistry, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Serge Y Fuchs
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Park KL, Oh DG, Kim YO, Song KS, Ahn DW. Rosiglitazone suppresses RANKL-induced NFATc1 autoamplification by disrupting the physical interaction between NFATc1 and PPARγ. FEBS Open Bio 2018; 8:1584-1593. [PMID: 30338210 PMCID: PMC6168694 DOI: 10.1002/2211-5463.12513] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 02/20/2018] [Accepted: 03/15/2018] [Indexed: 11/09/2022] Open
Abstract
Receptor activator of nuclear factor-κB ligand (RANKL) is required for initiation of osteoclastogenesis, with the signaling pathway including the NF-kB, c-Fos, and nuclear factor of activated T cells, cytoplasmic 1 (NFATc1) transcription factors. Because NFATc1 expression is autoamplified, we investigated the molecular mechanism by which peroxisome proliferator-activated receptor gamma (PPARγ) activation by the thiazolidinedione drug rosiglitazone decreases NFATc1 expression during RANKL stimulation. Western blotting demonstrated that rosiglitazone attenuated the increase in NFATc1 protein level induced by RANKL without affecting that of PPARγ. Immunofluorescence data indicated that rosiglitazone tended to suppress RANKL-induced NFATc1 nuclear translocation, partly by reducing calcineurin activity, as reflected by the observed decrease in nuclear NFATc1 abundance. On coimmunoprecipitation, the intensity of the physical interaction between NFATc1 and PPARγ was unexpectedly higher in the RANKL-stimulated group than in the control, but rosiglitazone reduced this to basal levels. Furthermore, RANKL failed to elevate mRNA expression of NFATc1 after PPARγ knockdown. ChIP assay indicated that rosiglitazone significantly reduced the binding of NFATc1 to its own promoter despite RANKL stimulation. These findings suggest that PPARγ activation by rosiglitazone blocks NFATc1 from binding to its own promoter, thereby reducing RANKL-induced NFATc1 autoamplification.
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Affiliation(s)
- Kyeong-Lok Park
- Department of Dentistry Kosin University Gospel Hospital Seo-gu Korea
| | - Da-Gyo Oh
- Department of Physiology Kosin University College of Medicine Seo-gu Korea
| | - Young-Ok Kim
- Department of Pathology Kosin University College of Medicine Seo-gu Korea
| | - Kyeong-Seob Song
- Department of Physiology Kosin University College of Medicine Seo-gu Korea
| | - Do-Whan Ahn
- Department of Physiology Kosin University College of Medicine Seo-gu Korea
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Lim S, Kim KM, Kim SG, Kim DM, Woo JT, Chung CH, Ko KS, Park JH, Park Y, Kim SJ, Jang HC, Choi DS. Effects of Lobeglitazone, a Novel Thiazolidinedione, on Bone Mineral Density in Patients with Type 2 Diabetes Mellitus over 52 Weeks. Diabetes Metab J 2017; 41:377-385. [PMID: 29086536 PMCID: PMC5663677 DOI: 10.4093/dmj.2017.41.5.377] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 05/05/2017] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND The aim of this multicenter, randomized, double-blind study was to examine the effect of lobeglitazone, a novel thiazolidinedione, on the changes in bone mineral density (BMD) in patients with type 2 diabetes mellitus. METHODS A 24-week, double-blinded phase was followed by a 28-week, open-label phase, in which the placebo group also started to receive lobeglitazone. A total of 170 patients aged 34 to 76 years were randomly assigned in a 2:1 ratio to receive lobeglitazone 0.5 mg or a matching placebo orally, once daily. BMD was assessed using dual-energy X-ray absorptiometry at week 24 and at the end of the study (week 52). RESULTS During the double-blinded phase, the femur neck BMD showed decreasing patterns in both groups, without statistical significance (-0.85%±0.36% and -0.78%±0.46% in the lobeglitazone and placebo groups, respectively). The treatment difference between the groups was 0.07%, which was also not statistically significant. Further, minimal, nonsignificant decreases were observed in both groups in the total hip BMD compared to values at baseline, and these differences also did not significantly differ between the groups. During the open-label phase, the BMD was further decreased, but not significantly, by -0.32% at the femur neck and by -0.60% at the total hip in the lobeglitazone group, and these changes did not significantly differ compared with the original placebo group switched to lobeglitazone. CONCLUSION Our results indicate that treatment with lobeglitazone 0.5 mg over 52 weeks showed no detrimental effect on the BMD compared to the placebo.
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Affiliation(s)
- Soo Lim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Kyoung Min Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Sin Gon Kim
- Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
| | - Doo Man Kim
- Department of Internal Medicine, Hallym University Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Jeong Taek Woo
- Department of Internal Medicine, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, Korea
| | - Choon Hee Chung
- Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Kyung Soo Ko
- Department of Internal Medicine, Cardiovascular and Metabolic Disease Center, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Jeong Hyun Park
- Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea
| | - Yongsoo Park
- Kosair Children's Hospital Research Institute, University of Louisville, Louisville, KY, USA
- Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea
| | - Sang Jin Kim
- Department of Internal Medicine, Soon Chun Hyang University Cheonan Hospital, Soon Chun Hyang University College of Medicine, Cheonan, Korea
| | - Hak Chul Jang
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Dong Seop Choi
- Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
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Effect of the antidiabetic agent pioglitazone on bone metabolism in rats. J Pharmacol Sci 2017; 135:22-28. [DOI: 10.1016/j.jphs.2017.08.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 08/03/2017] [Accepted: 08/10/2017] [Indexed: 11/17/2022] Open
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Davidson MA, Mattison DR, Azoulay L, Krewski D. Thiazolidinedione drugs in the treatment of type 2 diabetes mellitus: past, present and future. Crit Rev Toxicol 2017; 48:52-108. [PMID: 28816105 DOI: 10.1080/10408444.2017.1351420] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Thiazolidinedione (TZD) drugs used in the treatment of type 2 diabetes mellitus (T2DM) have proven effective in improving insulin sensitivity, hyperglycemia, and lipid metabolism. Though well tolerated by some patients, their mechanism of action as ligands of peroxisome proliferator-activated receptors (PPARs) results in the activation of several pathways in addition to those responsible for glycemic control and lipid homeostasis. These pathways, which include those related to inflammation, bone formation, and cell proliferation, may lead to adverse health outcomes. As treatment with TZDs has been associated with adverse hepatic, cardiovascular, osteological, and carcinogenic events in some studies, the role of TZDs in the treatment of T2DM continues to be debated. At the same time, new therapeutic roles for TZDs are being investigated, with new forms and isoforms currently in the pre-clinical phase for use in the prevention and treatment of some cancers, inflammatory diseases, and other conditions. The aims of this review are to provide an overview of the mechanism(s) of action of TZDs, a review of their safety for use in the treatment of T2DM, and a perspective on their current and future therapeutic roles.
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Affiliation(s)
- Melissa A Davidson
- a Faculty of Health Sciences , University of Ottawa , Ottawa , Canada.,b McLaughlin Centre for Population Health Risk Assessment , Ottawa , Canada
| | - Donald R Mattison
- b McLaughlin Centre for Population Health Risk Assessment , Ottawa , Canada.,c Risk Sciences International , Ottawa , Canada
| | - Laurent Azoulay
- d Center for Clinical Epidemiology , Lady Davis Research Institute, Jewish General Hospital , Montreal , Canada.,e Department of Oncology , McGill University , Montreal , Canada
| | - Daniel Krewski
- a Faculty of Health Sciences , University of Ottawa , Ottawa , Canada.,b McLaughlin Centre for Population Health Risk Assessment , Ottawa , Canada.,c Risk Sciences International , Ottawa , Canada.,f Faculty of Medicine , University of Ottawa , Ottawa , Canada
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Abstract
Objective The use of thiazolidinediones is reported to be associated with an increased frequency of fractures, especially in women; however, the underlying mechanism is not clear. In this prospective study, we compared the effects of pioglitazone and metformin on bone metabolism in Japanese patients with type 2 diabetes mellitus. Methods A total of 58 patients with type 2 diabetes (24 men and 34 women) were randomly assigned to receive either pioglitazone (30 and 15 mg/day for men and women, respectively) or metformin (750 mg/day). The changes in serum and urinary type 1 cross-linked N-telopeptide (NTX), type 1 cross-linked C-telopeptide (CTX), bone alkaline phosphatase (BAP), homocysteine, and serum pentosidine were evaluated before and after three months of treatment. The primary endpoint was changes in bone resorption markers after three months. Patients The subjects of this research were male and female type 2 diabetes patients, less than 80 years of age. Results Pioglitazone significantly increased the serum and urinary NTX and serum and urinary CTX levels. The rates of changes in the serum and urinary NTX and CTX were significantly greater in the pioglitazone group than in the metformin group. Although the BAP levels decreased significantly in the pioglitazone group, the rates of change were similar between the two groups. In the pioglitazone group, the changes in fasting insulin levels correlated significantly with increased bone resorption, independent of age and gender. Conclusion The results demonstrated that pioglitazone increased bone resorption independent of age and gender in Japanese patients with type 2 diabetes.
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Affiliation(s)
- Hiroko Mori
- First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan
| | - Yosuke Okada
- First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan
| | - Yoshiya Tanaka
- First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan
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Nakanishi A, Tsukamoto I. n-3 polyunsaturated fatty acids stimulate osteoclastogenesis through PPARγ-mediated enhancement of c-Fos expression, and suppress osteoclastogenesis through PPARγ-dependent inhibition of NFkB activation. J Nutr Biochem 2015; 26:1317-27. [PMID: 26303404 DOI: 10.1016/j.jnutbio.2015.06.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 06/17/2015] [Accepted: 06/17/2015] [Indexed: 11/17/2022]
Abstract
n-3 polyunsaturated fatty acids (PUFAs), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been reported to suppress osteoclastogenesis in vivo. In this study, the effect of PUFAs on receptor for activation of nuclear factor-κB ligand (RANKL)-induced osteoclastogenesis was examined using bone marrow-derived monocytes/macrophage precursor cells (BMMs) or bone marrow cells (BMCs) in vitro. EPA and DHA stimulated the osteoclastic differentiation of BMMs, but n-6 PUFAs, linoleic acid and arachidonic acid had no effect. The stimulation of osteoclastogenesis of BMMs by EPA and DHA was associated with enhancement of the gene expressions of c-Fos, tartrate-resistant acid phosphatase, cathepsin K and peroxisome proliferator-activated receptor-γ (PPARγ) and the protein levels of c-Fos, PPARγ and nuclear factor of activated T cells, cytoplasmic, calcineurin-dependent-1 (NFATc1). The PPARγ agonists, rosiglitazone and GW1929, also stimulated the osteoclastogenesis of BMMs. The PPARγ antagonists, T0070907 and GW9662, inhibited the stimulations of osteoclastogenesis and c-Fos expression by EPA or DHA. However, EPA and DHA inhibited the osteoclastogenesis in BMCs including BMMs and mesenchymal stem cells (MSCs). This inhibition was associated with suppression of the expression of RANKL and nuclear factor-κB (NFκB)-regulating genes, cyclooxygenase 2, TNFα and IL-6 in BMCs and MSCs. The agonists and antagonists of PPARγ showed that the inhibitions of NFκB transcriptional activity and osteoclastogenesis by EPA and DHA were PPARγ-dependent. These results suggest that EPA and DHA directly act on BMMs and stimulate osteoclastogenesis through enhancing c-Fos expression mediated by PPARγ but suppress osteoclastogenesis through the PPARγ-dependent inhibition of NFκB activation of MSCs in BMCs.
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Affiliation(s)
- Atsuko Nakanishi
- Department of Food Science and Nutrition, Nara Women's University, Kita-uoya Nishi-machi, Nara, 630-8506, Japan
| | - Ikuyo Tsukamoto
- Department of Food Science and Nutrition, Nara Women's University, Kita-uoya Nishi-machi, Nara, 630-8506, Japan; Faculty of Clinical Nutrition, Hiroshima International University, 5-1-1, Hirokoshingai, Kure, Hiroshima, 737-0112, Japan.
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13
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Kim KR, Kim HJ, Lee SK, Ma GT, Park KK, Chung WY. 15-deoxy-δ12,14-prostaglandin j2 inhibits osteolytic breast cancer bone metastasis and estrogen deficiency-induced bone loss. PLoS One 2015; 10:e0122764. [PMID: 25859665 PMCID: PMC4393227 DOI: 10.1371/journal.pone.0122764] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 02/13/2015] [Indexed: 11/22/2022] Open
Abstract
Breast cancer is the major cause of cancer death in women worldwide. The most common site of metastasis is bone. Bone metastases obstruct the normal bone remodeling process and aberrantly enhance osteoclast-mediated bone resorption, which results in osteolytic lesions. 15-deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2) is an endogenous ligand of peroxisome proliferator-activated receptor gamma (PPARγ) that has anti-inflammatory and antitumor activity at micromolar concentrations through PPARγ-dependent and/or PPARγ-independent pathways. We investigated the inhibitory activity of 15d-PGJ2 on the bone loss that is associated with breast cancer bone metastasis and estrogen deficiency caused by cancer treatment. 15d-PGJ2 dose-dependently inhibited viability, migration, invasion, and parathyroid hormone-related protein (PTHrP) production in MDA-MB-231 breast cancer cells. 15d-PGJ2 suppressed receptor activator of nuclear factor kappa-B ligand (RANKL) mRNA levels and normalized osteoprotegerin (OPG) mRNA levels in hFOB1.19 osteoblastic cells treated with culture medium from MDA-MB-231 cells or PTHrP, which decreased the RANKL/OPG ratio. 15d-PGJ2 blocked RANKL-induced osteoclastogenesis and inhibited the formation of resorption pits by decreasing the activities of cathepsin K and matrix metalloproteinases, which are secreted by mature osteoclasts. 15d-PGJ2 exerted its effects on breast cancer and bone cells via PPARγ-independent pathways. In Balb/c nu/nu mice that received an intracardiac injection of MDA-MB-231 cells, subcutaneously injected 15d-PGJ2 substantially decreased metastatic progression, cancer cell-mediated bone destruction in femora, tibiae, and mandibles, and serum PTHrP levels. 15d-PGJ2 prevented the destruction of femoral trabecular structures in estrogen-deprived ICR mice as measured by bone morphometric parameters and serum biochemical data. Therefore, 15d-PGJ2 may be beneficial for the prevention and treatment of breast cancer-associated bone diseases.
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Affiliation(s)
- Ki Rim Kim
- Department of Dental Hygiene, Kyungpook National University, Sangju, 742–711, Korea
- Department of Oral Biology, Oral Cancer Research Institute, BK21 PLUS project, Yonsei University College of Dentistry, Seoul, 120–752, Korea
| | - Hyun Jeong Kim
- Department of Oral Biology, Oral Cancer Research Institute, BK21 PLUS project, Yonsei University College of Dentistry, Seoul, 120–752, Korea
- Department of Applied Life Science, The Graduate School, Yonsei University, Seoul, 120–749, Korea
| | - Sun Kyoung Lee
- Department of Oral Biology, Oral Cancer Research Institute, BK21 PLUS project, Yonsei University College of Dentistry, Seoul, 120–752, Korea
- Department of Applied Life Science, The Graduate School, Yonsei University, Seoul, 120–749, Korea
| | - Gwang Taek Ma
- Department of Applied Life Science, The Graduate School, Yonsei University, Seoul, 120–749, Korea
| | - Kwang Kyun Park
- Department of Oral Biology, Oral Cancer Research Institute, BK21 PLUS project, Yonsei University College of Dentistry, Seoul, 120–752, Korea
- Department of Applied Life Science, The Graduate School, Yonsei University, Seoul, 120–749, Korea
| | - Won Yoon Chung
- Department of Oral Biology, Oral Cancer Research Institute, BK21 PLUS project, Yonsei University College of Dentistry, Seoul, 120–752, Korea
- Department of Applied Life Science, The Graduate School, Yonsei University, Seoul, 120–749, Korea
- * E-mail:
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14
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Jin Z, Li X, Wan Y. Minireview: nuclear receptor regulation of osteoclast and bone remodeling. Mol Endocrinol 2014; 29:172-86. [PMID: 25549044 DOI: 10.1210/me.2014-1316] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Osteoclasts are bone-resorbing cells essential for skeletal remodeling and regeneration. However, excessive osteoclasts often contribute to prevalent bone degenerative diseases such as osteoporosis, arthritis, and cancer bone metastasis. Osteoclast dysregulation is also associated with rare disorders such as osteopetrosis, pycnodysostosis, Paget's disease, and Gorham-Stout syndrome. The nuclear receptor (NR) family of transcription factors functions as metabolic sensors that control a variety of physiological processes including skeletal homeostasis and serves as attractive therapeutic targets for many diseases. In this review, we highlight recent findings on the new players and the new mechanisms for how NRs regulate osteoclast differentiation and bone resorption. An enhanced understanding of NR functions in osteoclastogenesis will facilitate the development of not only novel osteoprotective medicine but also prudent strategies to minimize the adverse skeletal effects of certain NR-targeting drugs for a better treatment of cancer and metabolic diseases.
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Affiliation(s)
- Zixue Jin
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
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15
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Piccinin MA, Khan ZA. Pathophysiological role of enhanced bone marrow adipogenesis in diabetic complications. Adipocyte 2014; 3:263-72. [PMID: 26317050 DOI: 10.4161/adip.32215] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/16/2014] [Accepted: 07/30/2014] [Indexed: 12/12/2022] Open
Abstract
Diabetes leads to complications in select organ systems primarily by disrupting the vasculature of the target organs. These complications include both micro- (cardiomyopathy, retinopathy, nephropathy, and neuropathy) and macro-(atherosclerosis) angiopathies. Bone marrow angiopathy is also evident in both experimental models of the disease as well as in human diabetes. In addition to vascular disruption, bone loss and increased marrow adiposity have become hallmarks of the diabetic bone phenotype. Emerging evidence now implicates enhanced marrow adipogenesis and changes to cellular makeup of the marrow in a novel mechanistic link between various secondary complications of diabetes. In this review, we explore the mechanisms of enhanced marrow adipogenesis in diabetes and the link between changes to marrow cellular composition, and disruption and depletion of reparative stem cells.
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16
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Zhao D, Shi Z, Warriner AH, Qiao P, Hong H, Wang Y, Feng X. Molecular mechanism of thiazolidinedione-mediated inhibitory effects on osteoclastogenesis. PLoS One 2014; 9:e102706. [PMID: 25032991 PMCID: PMC4102552 DOI: 10.1371/journal.pone.0102706] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 06/23/2014] [Indexed: 11/19/2022] Open
Abstract
Thiazolidinediones are synthetic peroxisome proliferator-activated receptor γ agonists used to treat type 2 diabetes mellitus. Clinical evidence indicates that thiazolidinediones increase fracture risks in type 2 diabetes mellitus patients, but the mechanism by which thiazolidinediones augment fracture risks is not fully understood. Several groups recently demonstrated that thiazolidinediones stimulate osteoclast formation, thus proposing that thiazolidinediones induce bone loss in part by prompting osteoclastogenesis. However, numerous other studies showed that thiazolidinediones inhibit osteoclast formation. Moreover, the molecular mechanism by which thiazolidinediones modulate osteoclastogenesis is not fully understood. Here we independently address the role of thiazolidinediones in osteoclastogenesis in vitro and furthermore investigate the molecular mechanism underlying the in vitro effects of thiazolidinediones on osteoclastogenesis. Our in vitro data indicate that thiazolidinediones dose-dependently inhibit osteoclastogenesis from bone marrow macrophages, but the inhibitory effect is considerably reduced when bone marrow macrophages are pretreated with RANKL. In vitro mechanistic studies reveal that thiazolidinediones inhibit osteoclastogenesis not by impairing RANKL-induced activation of the NF-κB, JNK, p38 and ERK pathways in bone marrow macrophages. Nonetheless, thiazolidinediones inhibit osteoclastogenesis by suppressing RANKL-induced expression of NFATc1 and c-Fos, two key transcriptional regulators of osteoclastogenesis, in bone marrow macrophages. In addition, thiazolidinediones inhibit the RANKL-induced expression of osteoclast genes encoding matrix metalloproteinase 9, cathepsin K, tartrate-resistant acid phosphatase and carbonic anhydrase II in bone marrow macrophages. However, the ability of thiazolidinediones to inhibit the expression of NFATc1, c-Fos and the four osteoclast genes is notably weakened in RANKL-pretreated bone marrow macrophages. These in vitro studies have not only independently demonstrated that thiazolidinediones exert inhibitory effects on osteoclastogenesis but have also revealed crucial new insights into the molecular mechanism by which thiazolidinediones inhibit osteoclastogenesis.
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Affiliation(s)
- Dongfeng Zhao
- Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People’s Republic of China
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Zhenqi Shi
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Amy H. Warriner
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Ping Qiao
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Huixian Hong
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Yongjun Wang
- Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People’s Republic of China
- * E-mail: (YW); (XF)
| | - Xu Feng
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- * E-mail: (YW); (XF)
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17
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Patel JJ, Butters OR, Arnett TR. PPAR agonists stimulate adipogenesis at the expense of osteoblast differentiation while inhibiting osteoclast formation and activity. Cell Biochem Funct 2014; 32:368-77. [PMID: 24615887 DOI: 10.1002/cbf.3025] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/08/2013] [Accepted: 12/22/2013] [Indexed: 12/13/2022]
Abstract
Drugs used in the treatment of type 2 diabetes and cardiovascular disease, specifically peroxisome proliferator-activated receptor (PPAR) agonists, have been reported to affect bone cell function and fracture risk. In this study, we assessed the direct effects of PPAR-γ agonists (rosiglitazone and troglitazone), used in the treatment of diabetes, and a PPAR-α agonist (fenofibrate), used to treat hyperlipidaemia, on the function of primary osteoblasts and osteoclasts. Formation of 'trabecular' bone structures by rat calvarial osteoblasts was reduced by up to 85% in cultures treated with rosiglitazone and by 45% in troglitazone-treated or fenofibrate-treated cultures; at the same time, lipid droplet formation was increased by 40-70%. The expression of key osteogenic markers was similarly downregulated in cultures treated with PPAR agonists, whereas adipogenesis markers were upregulated. Formation of osteoclasts in cultures derived from mouse marrow diminished with fenofibrate treatment, whereas both glitazones reduced resorptive activity without affecting osteoclast number. Metformin, although not a PPAR agonist, is also commonly used in the treatment of type 2 diabetes. Here, metformin was found to have no effect on bone cell function. Taken together, these data suggest that PPAR-γ agonists may enhance bone loss via increased adipogenesis at the expense of osteoblast formation. In contrast, PPAR-α agonists may prevent bone loss. Given that the prevalence of diabetes and cardiovascular disease is expected to rise significantly, greater attention may need to be paid to the effects of PPAR agonists on bone homeostasis.
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Affiliation(s)
- Jessal J Patel
- Department of Cell and Developmental Biology, University College London, London, UK
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18
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Spindler TJ, Tseng AW, Zhou X, Adams GB. Adipocytic cells augment the support of primitive hematopoietic cells in vitro but have no effect in the bone marrow niche under homeostatic conditions. Stem Cells Dev 2013; 23:434-41. [PMID: 24083324 DOI: 10.1089/scd.2013.0227] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Mesenchymal stem cells (MSCs), as well as osteoblastic cells derived from these MSCs, have been shown to be key components of the hematopoietic stem cell (HSC) niche. In this study, we wished to examine whether other cell types that are known to differentiate from MSCs similarly regulate the stem cell niche, namely cells of the adipocyte lineage. Recent studies have examined the role that adipocytes play in the biology of the HSCs in different bone locations and in transplantation settings; however, none have examined their role under homeostatic conditions. We compared the ability of adipocytic and nonadipocytic cell lines to support primitive hematopoietic cells in vitro. Preadipocytic cell lines demonstrated enhanced support of hematopoietic cells. Similarly, primary bone marrow (BM) cells treated with troglitazone, a drug that enhances adipogenesis, also demonstrated augmented support over control-treated stromal cells. We further examined the effects of increased adipocyte number in vivo under homeostatic conditions using troglitazone treatment and found that these alterations had no effect on HSC frequency. Taken together, we demonstrate that cells of the adipocyte lineage promote the ability of stromal cells to support primitive hematopoietic cells in vitro, yet alterations of adipocyte number and volume in vivo have no effect. These data suggest that adipocytes are not a component of the adult BM HSC niche under homeostatic conditions.
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Affiliation(s)
- Tassja J Spindler
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at USC, Keck School of Medicine, University of Southern California , Los Angeles, California
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19
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Ayturk UM, Jacobsen CM, Christodoulou DC, Gorham J, Seidman JG, Seidman CE, Robling AG, Warman ML. An RNA-seq protocol to identify mRNA expression changes in mouse diaphyseal bone: applications in mice with bone property altering Lrp5 mutations. J Bone Miner Res 2013; 28:2081-93. [PMID: 23553928 PMCID: PMC3743099 DOI: 10.1002/jbmr.1946] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 03/18/2013] [Accepted: 03/22/2013] [Indexed: 01/20/2023]
Abstract
Loss-of-function and certain missense mutations in the Wnt coreceptor low-density lipoprotein receptor-related protein 5 (LRP5) significantly decrease or increase bone mass, respectively. These human skeletal phenotypes have been recapitulated in mice harboring Lrp5 knockout and knock-in mutations. We hypothesized that measuring mRNA expression in diaphyseal bone from mice with Lrp5 wild-type (Lrp5(+/+) ), knockout (Lrp5(-/-) ), and high bone mass (HBM)-causing (Lrp5(p.A214V/+) ) knock-in alleles could identify genes and pathways that regulate or are regulated by LRP5 activity. We performed RNA-seq on pairs of tibial diaphyseal bones from four 16-week-old mice with each of the aforementioned genotypes. We then evaluated different methods for controlling for contaminating nonskeletal tissue (ie, blood, bone marrow, and skeletal muscle) in our data. These methods included predigestion of diaphyseal bone with collagenase and separate transcriptional profiling of blood, skeletal muscle, and bone marrow. We found that collagenase digestion reduced contamination, but also altered gene expression in the remaining cells. In contrast, in silico filtering of the diaphyseal bone RNA-seq data for highly expressed blood, skeletal muscle, and bone marrow transcripts significantly increased the correlation between RNA-seq data from an animal's right and left tibias and from animals with the same Lrp5 genotype. We conclude that reliable and reproducible RNA-seq data can be obtained from mouse diaphyseal bone and that lack of LRP5 has a more pronounced effect on gene expression than the HBM-causing LRP5 missense mutation. We identified 84 differentially expressed protein-coding transcripts between LRP5 "sufficient" (ie, Lrp5(+/+) and Lrp5(p.A214V/+) ) and "insufficient" (Lrp5(-/-) ) diaphyseal bone, and far fewer differentially expressed genes between Lrp5(p.A214V/+) and Lrp5(+/+) diaphyseal bone.
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Affiliation(s)
- Ugur M Ayturk
- Department of Orthopaedic Surgery, Boston Children's Hospital, Boston, MA, USA; Department of Genetics, Harvard Medical School, Boston, MA, USA
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20
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Sahmani M, Gholami A, Azarkeivan A, Darabi M, Ahmadi MH, Sabet MS, Najafipour R. Peroxisome proliferator-activated receptor-γ Pro12Ala polymorphism and risk of osteopenia in β-thalassemia major patients. Hemoglobin 2013; 37:564-73. [PMID: 23909657 DOI: 10.3109/03630269.2013.814035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Genetic factors have an important role in the incidence of osteopenia in thalassemia patients. The purpose of this study was to investigate the effect of the Pro12Ala polymorphism of the peroxisome proliferator-activated receptor-γ (PPARγ) gene on bone mineral density (BMD) and subsequently, the rate of osteopenia in β-thalassemia major (β-TM) patients. Blood samples were obtained from 156 β-TM patients referred to the Tehran and Qazvin Thalassemia Clinics. Samples were analyzed for polymorphisms of the PPARγ gene using polymerase chain reaction-restriction fragment length polymorphism (RFLP)-based methods. Multivariate analysis was used to investigate the relationship between the risk of osteopenia and the PPARγ gene polymorphism. Correlation analysis showed that there was a significant association between homozygous wild-type genotypes with susceptibility to osteopenia in β-TM patients (p = 0.024). Logistic regression analysis showed that the risk of osteopenia was significantly (p <0.05) higher in the homozygous wild-type genotype than carriers of the rare alleles. Furthermore, the associations were strengthened in men with a homozygous wild-type genotype after adjustment for age and body mass index (BMI) (p <0.05). This study suggests that the Pro12Ala polymorphism of the PPARγ gene might be an independent factor in BMD level and osteopenia in thalassemia patients.
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Affiliation(s)
- Mehdi Sahmani
- Department of Clinical Biochemistry and Genetics, Cellular and Molecular Research Centre, Qazvin University of Medical Sciences , Qazvin , Iran
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Wu K, Lin TH, Liou HC, Lu DH, Chen YR, Fu WM, Yang RS. Dextromethorphan inhibits osteoclast differentiation by suppressing RANKL-induced nuclear factor-κB activation. Osteoporos Int 2013; 24:2201-14. [PMID: 23400250 DOI: 10.1007/s00198-013-2279-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 01/21/2013] [Indexed: 10/27/2022]
Abstract
UNLABELLED Dextromethorphan (DXM), a commonly used antitussive, is a dextrorotatory morphinan. Here, we report that DXM inhibits the receptor activator of nuclear factor kappa B ligand (RANKL)-induced osteoclastogenesis and bone resorption by abrogating the activation of NF-κB signalling in vitro. Oral administration of DXM ameliorates ovariectomy (OVX)-induced osteoporosis in vivo. INTRODUCTION DXM was reported to possess anti-inflammatory properties through inhibition of the release of pro-inflammatory factors. However, the potential role and action mechanism of DXM on osteoclasts and osteoblasts remain unclear. In this study, in vitro and in vivo studies were performed to investigate the potential effects of DXM on osteoclastogenesis and OVX-induced bone loss. METHODS Osteoclastogenesis was examined by the TRAP staining, pit resorption, TNF-α release, and CCR2 and CALCR gene expression. Osteoblast differentiation was analyzed by calcium deposition. Osteogenic and adipogenic genes were measured by real-time PCR. Signaling pathways were explored using Western blot. ICR mice were used in an OVX-induced osteoporosis model. Tibiae were measured by µCT and serum markers were examined with ELISA kits. RESULTS DXM inhibited RANKL-induced osteoclastogenesis. DXM mainly inhibited osteoclastogenesis via abrogation of IKK-IκBα-NF-κB pathways. However, a higher dosage of DXM antagonized the differentiation of osteoblasts via the inhibition of osteogenic signals and increase of adipogenic signals. Oral administration of DXM (20 mg/kg/day) partially reduced trabecular bone loss in ovariectomized mice. CONCLUSION DXM inhibits osteoclast differentiation and activity by affecting NF-κB signaling. Therefore, DXM at suitable doses may have new therapeutic applications for the treatment of diseases associated with excessive osteoclastic activity.
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Affiliation(s)
- Karl Wu
- Department of Orthopedics, Far Eastern Memorial Hospital, No. 21, Sec. 2, Nanya S. Rd., New Taipei City 220, Taiwan, Republic of China
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22
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Kumar S, Hoffman SJ, Samadfam R, Mansell P, Jolette J, Smith SY, Guldberg RE, Fitzpatrick LA. The effect of rosiglitazone on bone mass and fragility is reversible and can be attenuated with alendronate. J Bone Miner Res 2013; 28:1653-65. [PMID: 23456892 DOI: 10.1002/jbmr.1918] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 02/07/2013] [Accepted: 02/21/2013] [Indexed: 11/11/2022]
Abstract
Rosiglitazone (RSG) is an antidiabetic drug that has been associated with increased peripheral fractures, primarily in postmenopausal women. In this report, we investigated the underlying mechanisms of RSG-associated bone loss in ovariectomized (OVX) rats and determined whether changes in bone parameters associated with RSG administration are reversible on treatment cessation or preventable by coadministration with an antiresorptive agent. Nine-month-old Sprague-Dawley rats underwent OVX or sham operation. Sham-operated rats received oral vehicle only; OVX animals were randomized to receive vehicle, RSG, alendronate (ALN), or RSG plus ALN for 12 weeks. All treatment started the day after ovariectomy. After the 12-week treatment period, the OVX and RSG groups also underwent an 8-week treatment-free recovery period. Bone densitometry measurements, bone turnover markers, biomechanical testing, and histomorphometric analysis were conducted. Microcomputed tomography was also used to investigate changes in microarchitecture. RSG significantly increased deoxypyridinoline levels compared with OVX. Significant exacerbation of OVX-induced loss of bone mass, strength, and microarchitectural deterioration was observed in RSG-treated OVX animals compared with OVX controls. These effects were observed predominantly at sites rich in trabecular bone, with less pronounced effects in cortical bone. Coadministration of RSG and ALN prevented the bone loss associated with RSG treatment. Following cessation of RSG treatment, effects on bone mass and strength showed evidence of reversal. Thus, treatment of OVX rats with RSG results in loss of bone mass and strength, primarily at sites rich in trabecular bone, mainly due to increased bone resorption. These effects can be prevented by concomitant treatment with ALN and may be reversed following discontinuation of RSG.
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Affiliation(s)
- Sanjay Kumar
- Musculoskeletal Diseases, GlaxoSmithKline, King of Prussia, PA 19406, USA.
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23
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Sadie-Van Gijsen H, Crowther NJ, Hough FS, Ferris WF. The interrelationship between bone and fat: from cellular see-saw to endocrine reciprocity. Cell Mol Life Sci 2013; 70:2331-49. [PMID: 23178849 PMCID: PMC11113730 DOI: 10.1007/s00018-012-1211-2] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 10/05/2012] [Accepted: 11/07/2012] [Indexed: 01/03/2023]
Abstract
The number of mature osteoblasts and marrow adipocytes in bone is influenced by the differentiation of the common mesenchymal progenitor cell towards one phenotype and away from the other. Consequently, factors which promote adipogenesis not only lead to fatty marrow but also inhibit osteoblastogenesis, resulting in decreased osteoblast numbers, diminished bone formation and, potentially, inadequate bone mass and osteoporosis. In addition to osteoblast and bone adipocyte numbers being influenced by this skewing of progenitor cell differentiation towards one phenotype, mature osteoblasts and adipocytes secrete factors which may evoke changes in the cell fate and function of each other. This review examines the endogenous factors, such as PPAR-γ2, Wnt, IGF-1, GH, FGF-2, oestrogen, the GP130 signalling cytokines, vitamin D and glucocorticoids, which regulate the selection between osteoblastogenesis and adipogenesis and the interrelationship between fat and bone. The role of adipokines on bone, such as adiponectin and leptin, as well as adipose-derived oestrogen, is reviewed and the role of bone as an energy regulating endocrine organ is discussed.
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Affiliation(s)
- H. Sadie-Van Gijsen
- Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505 South Africa
| | - N. J. Crowther
- Department of Chemical Pathology, National Health Laboratory Services, University of Witwatersrand Medical School, 7 York Road, Parktown, 2193 South Africa
| | - F. S. Hough
- Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505 South Africa
| | - W. F. Ferris
- Division of Endocrinology, Department of Medicine, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505 South Africa
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Banka S, Mukudai Y, Yoshihama Y, Shirota T, Kondo S, Shintani S. A combination of chemical and mechanical stimuli enhances not only osteo- but also chondro-differentiation in adipose-derived stem cells. J Oral Biosci 2012. [DOI: 10.1016/j.job.2012.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mieczkowska A, Baslé MF, Chappard D, Mabilleau G. Thiazolidinediones induce osteocyte apoptosis by a G protein-coupled receptor 40-dependent mechanism. J Biol Chem 2012; 287:23517-26. [PMID: 22593579 DOI: 10.1074/jbc.m111.324814] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Thiazolidinediones (TZDs) represent an interesting treatment of type 2 diabetes mellitus. However, adverse effects such as heart problems and bone fractures have already been reported. Previously, we reported that pioglitazone and rosiglitazone induce osteocyte apoptosis and sclerostin up-regulation; however, the molecular mechanisms leading to such effects are unknown. In this study, we found that TZDs rapidly activated Erk1/2 and p38. These activations were mediated through Ras proteins and GPR40, a receptor expressed on the surface of osteocytes. Activation of this pathway led only to osteocyte apoptosis but not sclerostin up-regulation. On the other hand, TZDs were capable of activating peroxisome proliferator-activated receptor-γ, and activation of this signaling pathway led to sclerostin up-regulation but not osteocyte apoptosis. This study demonstrates two distinct signaling pathways activated in osteocytes in response to TZDs that could participate in the observed increase in fractures in TZD-treated patients.
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Affiliation(s)
- Aleksandra Mieczkowska
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7LD, United Kingdom
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Cho ES, Kim MK, Son YO, Lee KS, Park SM, Lee JC. The effects of rosiglitazone on osteoblastic differentiation, osteoclast formation and bone resorption. Mol Cells 2012; 33:173-81. [PMID: 22286232 PMCID: PMC3887713 DOI: 10.1007/s10059-012-2240-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 12/04/2011] [Accepted: 12/05/2011] [Indexed: 01/28/2023] Open
Abstract
Rosiglitazone has the potential to activate peroxisome proliferator-activated receptor-γ (PPARγ), which in turn can affect bone formation and resorption. However, the mechanisms by which rosiglitazone regulates osteoclastic orosteoblastic differentiation are not fully understood. This study examines how rosiglitazone affects osteoclast formation, bone resorption and osteoblast differentiation from mouse bone marrow. Rosiglitazone treatment not only inhibited the formation of tartrate-resistant acid phosphatase-positive cells, but also prevented pit formation by bone marrow cells in a dose- and time-dependent manner. Rosiglitazone also suppressed the receptor activator of nuclear factor (NF)-κB ligand (RANKL) receptor(RANK) expression but increased PPARγ2 expression in the cells. In addition, rosiglitazone diminished RANKL induced activation of NF-κB-DNA binding by blocking IκBαphosphorylation. Furthermore, it reduced collagen and osteocalcin levels to nearly zero and prevented mRNA expression of osteoblast-specific proteins including runtrelated transcription factor-2, osteocalcin, and type I collagen.However, mRNA levels of adipocyte-specific marker, aP2, were markedly increased in the cells co-incubated with rosiglitazone. These results suggest that PPARγ activation by rosiglitazone inhibits osteoblast differentiation with increased adipogenesis in bone marrow cells and also may prevent osteoclast formation and bone resorptionin the cells.
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Affiliation(s)
- Eui-Sic Cho
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences (Brain Korea 21 program) and School of Dentistry, Chonbuk National University, Jeonju 561-756,
Korea
| | - Myoung-Kyun Kim
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences (Brain Korea 21 program) and School of Dentistry, Chonbuk National University, Jeonju 561-756,
Korea
| | - Young-Ok Son
- Graduate Center for Toxicology, University of Kentucky, Lexington, Kentucky 40536-0001,
USA
| | - Keun-Soo Lee
- Research Laboratory, Korea Bone Bank Co. Ltd., Seoul 153-782,
Korea
| | - Seung-Moon Park
- Division of Biotechnology, Chonbuk National University, Iksan 570-752,
Korea
| | - Jeong-Chae Lee
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences (Brain Korea 21 program) and School of Dentistry, Chonbuk National University, Jeonju 561-756,
Korea
- Graduate Center for Toxicology, University of Kentucky, Lexington, Kentucky 40536-0001,
USA
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Sardone LD, Renlund R, Willett TL, Fantus IG, Grynpas MD. Effect of rosiglitazone on bone quality in a rat model of insulin resistance and osteoporosis. Diabetes 2011; 60:3271-8. [PMID: 21998400 PMCID: PMC3219933 DOI: 10.2337/db10-1672] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Rosiglitazone (RSG) is an insulin-sensitizing drug used to treat type 2 diabetes mellitus. The A Diabetes Outcome Progression Trial (ADOPT) shows that women taking RSG experienced more fractures than patients taking other type 2 diabetes drugs. These were not osteoporotic vertebral fractures but, rather, occurred in the limbs. The purpose of this study was to investigate how RSG treatment alters bone quality, which leads to fracture risk, using the Zucker fatty rat as a model. RESEARCH DESIGN AND METHODS A total of 61 female 4-month-old rats were divided into six groups. One Sham group was a control and another was administered oral RSG 10 mg/kg/day. Four ovariectomized (OVX) groups were dosed as follows: controls, RSG 10 mg/kg, alendronate (ALN, injected at 0.7 mg/kg/week), and RSG 10 mg/kg plus ALN. After 12 weeks of treatment, bone quality was evaluated by mechanical testing. Microarchitecture, bone mineral density (BMD), cortical bone porosity, and bone remodeling were also measured. RESULTS OVX RSG 10 mg/kg rats had lower vertebral BMD and compromised trabecular architecture versus OVX controls. Increased cortical bone porosity and decreased mechanical properties occurred in these rats. ALN treatment prevented decreased BMD and architectural and mechanical properties in the OVX model. Reduced bone formation, increased marrow adiposity, and excess bone resorption were observed in RSG-treated rats. CONCLUSIONS RSG decreases bone quality. An unusual finding was an increase in cortical bone porosity induced by RSG, consistent with its effect on long bones of women. ALN, an inhibitor of bone resorption, enhanced mechanical strength and may provide an approach to partially counter the deleterious skeletal effects of RSG.
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Affiliation(s)
- Laura D. Sardone
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Richard Renlund
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Thomas L. Willett
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Ivan G. Fantus
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Medicine, Mount Sinai Hospital, University of Toronto, Ontario, Canada
| | - Marc D. Grynpas
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
- Corresponding author: Marc D. Grynpas,
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White UA, Stephens JM. The gp130 receptor cytokine family: regulators of adipocyte development and function. Curr Pharm Des 2011; 17:340-6. [PMID: 21375496 DOI: 10.2174/138161211795164202] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Accepted: 02/10/2011] [Indexed: 01/04/2023]
Abstract
Gp130 cytokines are involved in the regulation of numerous biological processes, including hematopoiesis, immune response, inflammation, cardiovascular action, and neuronal survival. These cytokines share glycoprotein 130 as a common signal transducer in their receptor complex and typically activate STAT3. Most gp130 cytokines have paracrine or endocrine actions, and their levels can be measured in circulation in rodents and humans. In recent years, various laboratories have conducted studies to demonstrate that gp130 cytokines can modulate adipocyte development and function. Therefore, these studies suggest that some gp130 cytokines may be viable anti-obesity therapeutics. In this review, we will summarize the reported effects of gp130 cytokines on adipocyte differentiation and adipocyte function. In addition, the modulation of gp130 cytokines in conditions of obesity, insulin resistance, and Type 2 diabetes will be presented.
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Affiliation(s)
- Ursula A White
- Louisiana State University, Department of Biological Sciences, Baton Rouge, LA 70803, USA
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Stunes AK, Westbroek I, Gustafsson BI, Fossmark R, Waarsing JH, Eriksen EF, Petzold C, Reseland JE, Syversen U. The peroxisome proliferator-activated receptor (PPAR) alpha agonist fenofibrate maintains bone mass, while the PPAR gamma agonist pioglitazone exaggerates bone loss, in ovariectomized rats. BMC Endocr Disord 2011; 11:11. [PMID: 21615901 PMCID: PMC3127763 DOI: 10.1186/1472-6823-11-11] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Accepted: 05/26/2011] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Activation of peroxisome proliferator-activated receptor (PPAR)gamma is associated with bone loss and increased fracture risk, while PPARalpha activation seems to have positive skeletal effects. To further explore these effects we have examined the effect of the PPARalpha agonists fenofibrate and Wyeth 14643, and the PPARgamma agonist pioglitazone, on bone mineral density (BMD), bone architecture and biomechanical strength in ovariectomized rats. METHODS Fifty-five female Sprague-Dawley rats were assigned to five groups. One group was sham-operated and given vehicle (methylcellulose), the other groups were ovariectomized and given vehicle, fenofibrate, Wyeth 14643 and pioglitazone, respectively, daily for four months. Whole body and femoral BMD were measured by dual X-ray absorptiometry (DXA), and biomechanical testing of femurs, and micro-computed tomography (microCT) of the femoral shaft and head, were performed. RESULTS Whole body and femoral BMD were significantly higher in sham controls and ovariectomized animals given fenofibrate, compared to ovariectomized controls. Ovariectomized rats given Wyeth 14643, maintained whole body BMD at sham levels, while rats on pioglitazone had lower whole body and femoral BMD, impaired bone quality and less mechanical strength compared to sham and ovariectomized controls. In contrast, cortical volume, trabecular bone volume and thickness, and endocortical volume were maintained at sham levels in rats given fenofibrate. CONCLUSIONS The PPARalpha agonist fenofibrate, and to a lesser extent the PPARaplha agonist Wyeth 14643, maintained BMD and bone architecture at sham levels, while the PPARgamma agonist pioglitazone exaggerated bone loss and negatively affected bone architecture, in ovariectomized rats.
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Affiliation(s)
- Astrid K Stunes
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
| | - Irene Westbroek
- Internal Medicine and Orthopaedics, Erasmus MC, Rotterdam, the Netherlands
| | - Björn I Gustafsson
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
- Department of Gastroenterology, St Olav's University Hospital HF, Trondheim, Norway
| | - Reidar Fossmark
- Department of Gastroenterology, St Olav's University Hospital HF, Trondheim, Norway
| | - Jan H Waarsing
- Internal Medicine and Orthopaedics, Erasmus MC, Rotterdam, the Netherlands
| | - Erik F Eriksen
- Hormone Laboratory, Aker University Hospital, Oslo, Norway
| | - Christiane Petzold
- Department of Biomaterials, Institute for Clinical Dentistry, University of Oslo, Oslo, Norway
| | - Janne E Reseland
- Department of Biomaterials, Institute for Clinical Dentistry, University of Oslo, Oslo, Norway
| | - Unni Syversen
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NTNU, Trondheim, Norway
- Department of Endocrinology, St Olav's University Hospital HF, Trondheim, Norway
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THIAZOLIDINEDIONES INHIBIT TNF-α-MEDIATED OSTEOCLAST DIFFERENTIATION OF RAW264.7 MACROPHAGES AND MOUSE BONE MARROW CELLS THROUGH DOWNREGULATION OF NFATc1. Shock 2010; 33:662-7. [DOI: 10.1097/shk.0b013e3181cc0738] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Li H, Cui R, Cai H, Wu G, Lv Z, Sheng C, Cheng X, Li F, Yu Y. The effect of thiazolidinediones on bone mineral density in Chinese older patients with type 2 diabetes. J Bone Miner Metab 2010; 28:77-81. [PMID: 19603247 DOI: 10.1007/s00774-009-0104-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Accepted: 05/19/2009] [Indexed: 10/20/2022]
Abstract
The effect of thiazolidinediones (TZDs) on bone mineral density (BMD) and bone metabolism in patients with type 2 diabetes is still in debate. Accumulating evidence has emerged that long-term administration of TZDs may increase the occurrence of osteoporosis, at least in postmenopausal women. Because little clinical data has been reported on Chinese people, a retrospective study was performed. One-hundred ninety-eight Chinese people, all from our inpatients, were selected for a 24-28 month review (26 +/- 0.5 m). Four groups divided according to gender and TZD use were designated fTZD, mTZD, f and m. Changes of subjects' BMD and bone metabolism markers were noted and analyzed. Compared with group f, bone loss from fTZD in this over 24-month review was more significant in lumbar spine (L1-L4) (0.1 +/- 0.15 vs. 0.06 +/- 0.11) and right hip (0.09 +/- 0.15 vs. 0.05 +/- 0.14) (g/cm(3)) (P < 0.05). However, the opposite result was found in male patients with less bone loss in group mTZD. Two bone metabolism markers, including beta C-terminal telopeptide of type I collagen (beta-CTX) and osteocalcin (OC), in this study did not prove valuable in revealing changes among groups. We concluded that long-term TZD use may increase the risk of bone loss in Chinese postmenopausal patients with type 2 diabetes, which may provide caution on drug treatment in clinical practice. Whether TZD can protect male patients against BMD loss or not awaits further research.
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Affiliation(s)
- Hong Li
- Department of Endocrinology, Shanghai Tenth Hospital affiliated to Tongji University, 301# Middle YanChang Road, 200072 Shanghai, China
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Abstract
Recent evidence suggests that the risk of several types of fracture is increased in type 2 diabetes mellitus (T2DM). Thiazolidinediones (TZDs) are now widely used in the management of T2DM, and their use may increase in other diseases characterized by insulin resistance. The PPAR-gamma, the molecular target of the TZDs currently in clinical use, is expressed in skeletal tissue. Evidence from preclinical studies has demonstrated that activation of PPAR-gamma (i) inhibits bone formation by diverting mesenchymal stem cells from the osteogenic to the adipocytic lineage and (ii) may increase bone resorption by stimulating the development of osteoclasts. There is also potential for indirect adverse skeletal effects of PPAR-gamma activation by modulation of circulating levels of hormones and cytokines known to influence bone metabolism. Recent studies in humans have demonstrated that TZDs decrease markers of bone formation decrease bone mass, and increase fracture rates, at least in women. The implication of these findings is that fracture risk should be considered in patients with T2DM for whom TZD therapy is being considered, and appropriate therapy instigated to prevent fractures in individuals ascertained to be at high risk.
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Affiliation(s)
- Andrew Grey
- Department of Medicine, University of Auckland, Auckland, New Zealand.
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Syversen U, Stunes AK, Gustafsson BI, Obrant KJ, Nordsletten L, Berge R, Thommesen L, Reseland JE. Different skeletal effects of the peroxisome proliferator activated receptor (PPAR)alpha agonist fenofibrate and the PPARgamma agonist pioglitazone. BMC Endocr Disord 2009; 9:10. [PMID: 19331671 PMCID: PMC2678137 DOI: 10.1186/1472-6823-9-10] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Accepted: 03/30/2009] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND All the peroxisome proliferator activated receptors (PPARs) are found to be expressed in bone cells. The PPARgamma agonist rosiglitazone has been shown to decrease bone mass in mice and thiazolidinediones (TZDs) have recently been found to increase bone loss and fracture risk in humans treated for type 2 diabetes mellitus. The aim of the study was to examine the effect of the PPARalpha agonist fenofibrate (FENO) and the PPARgamma agonist pioglitazone (PIO) on bone in intact female rats. METHODS Rats were given methylcellulose (vehicle), fenofibrate or pioglitazone (35 mg/kg body weight/day) by gavage for 4 months. BMC, BMD, and body composition were measured by DXA. Histomorphometry and biomechanical testing of excised femurs were performed. Effects of the compounds on bone cells were studied. RESULTS The FENO group had higher femoral BMD and smaller medullary area at the distal femur; while trabecular bone volume was similar to controls. Whole body BMD, BMC, and trabecular bone volume were lower, while medullary area was increased in PIO rats compared to controls. Ultimate bending moment and energy absorption of the femoral shafts were reduced in the PIO group, while similar to controls in the FENO group. Plasma osteocalcin was higher in the FENO group than in the other groups. FENO stimulated proliferation and differentiation of, and OPG release from, the preosteoblast cell line MC3T3-E1. CONCLUSION We show opposite skeletal effects of PPARalpha and gamma agonists in intact female rats. FENO resulted in significantly higher femoral BMD and lower medullary area, while PIO induced bone loss and impairment of the mechanical strength. This represents a novel effect of PPARalpha activation.
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Affiliation(s)
- Unni Syversen
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Endocrinology, St Olav's University Hospital HF, Trondheim, Norway
| | - Astrid K Stunes
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Björn I Gustafsson
- Department of Gastroenterology, St Olav's University Hospital HF, Trondheim, Norway
- Department of Surgery, Yale University School of Medicine, New Haven, USA
| | - Karl J Obrant
- Department of Orthopaedics, Malmø University Hospital, Malmø, Sweden
| | - Lars Nordsletten
- Department of Orthopaedics, Ullevål University Hospital, Oslo, Norway
| | - Rolf Berge
- Section of Medical Biochemistry, Institute of Medicine, University of Bergen, Norway
| | - Liv Thommesen
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
- Sør-Trøndelag University College, Faculty of Food Science and Medical Technology, Trondheim, Norway
| | - Janne E Reseland
- Department of Biomaterials, Institute for Clinical Dentistry, University of Oslo, Blindern, Oslo, Norway
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Hozumi A, Osaki M, Goto H, Sakamoto K, Inokuchi S, Shindo H. Bone marrow adipocytes support dexamethasone-induced osteoclast differentiation. Biochem Biophys Res Commun 2009; 382:780-4. [PMID: 19324007 DOI: 10.1016/j.bbrc.2009.03.111] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2009] [Accepted: 03/19/2009] [Indexed: 12/12/2022]
Abstract
The purpose of this study was to examine the ability of bone marrow adipocytes to support osteoclast differentiation in vitro. The primary bone marrow adipocytes were obtained from bone marrow fluid during prosthesis insertion. NFkappa-B ligand (RANKL), Osteoprotegerin (OPG), and macrophage colony stimulating factor (M-CSF) expressions in bone marrow adipocytes with or without dexamethasone were examined. In a co-culture system with bone marrow adipocytes and osteoclast precursor cells, osteoclast differentiation was assessed by the expression of titrate-resistant acid phosphatase (TRAP) staining. RANKL, OPG, and M-CSF mRNA expressions were confirmed in all individuals. Dexamethasone significantly induced RANKL and OPG expression. The RANKL/OPG ratio was increased by dexamethasone and was significant at 10(-7) M dexamethasone. With 10(-7) M dexamethasone, osteoclast precursor cells differentiated into multinucleated TRAP-positive cells when co-cultured with bone marrow adipocytes. The present study demonstrates for the first time that bone marrow adipocytes can support osteoclast differentiation in vitro.
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Affiliation(s)
- Akira Hozumi
- Department of Orthopaedic Surgery, Graduate School of Biomedical Science, Nagasaki University, Nagasaki, Japan
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A novel PPARγ agonist, KR62776, suppresses RANKL-induced osteoclast differentiation and activity by inhibiting MAP kinase pathways. Biochem Biophys Res Commun 2009; 378:645-9. [DOI: 10.1016/j.bbrc.2008.11.115] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2008] [Accepted: 11/20/2008] [Indexed: 12/12/2022]
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McDonough AK, Rosenthal RS, Cao X, Saag KG. The effect of thiazolidinediones on BMD and osteoporosis. ACTA ACUST UNITED AC 2008; 4:507-13. [PMID: 18695700 DOI: 10.1038/ncpendmet0920] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Accepted: 06/25/2008] [Indexed: 01/12/2023]
Abstract
Thiazolidinediones, also known as glitazones, are insulin-sensitizing medications that account for approximately 21% of oral antihyperglycemic drugs used in the US. Although the main therapeutic effects occur in adipose tissue, muscles and the liver, studies suggest effects in bone as well. Currently, two thiazolidinediones are marketed in the US-rosiglitazone and pioglitazone-and several others are under investigation. This Review examines the evidence regarding the effects of thiazolidinediones on skeletal health. These drugs appear to trigger preferential differentiation of mesenchymal stem cells into adipocytes rather than osteoblasts, leading to decreased bone formation and increased adipogenesis. Although only a few small, randomized studies have examined the effects of thiazolidinediones on bone in humans, the available data suggest that these agents contribute to bone loss in postmenopausal women; the relationship is less clear in men. On the basis of this limited evidence, the absolute increase in fracture risk associated with thiazolidinediones seems to be small. Pending data from future randomized, controlled trials of the association between thiazolidinediones and low bone mass, prescribers should consider use of these drugs as a risk factor for the development of osteoporosis in postmenopausal women.
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Affiliation(s)
- Allyson K McDonough
- University of Alabama at Birmingham, Division of Clinical Immunology/Rheumatology, FOT 820D, 1530 3rd Avenue South, Birmingham, AL 35294-3408, USA
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Epstein S, LeRoith D. Diabetes and fragility fractures - a burgeoning epidemic? Bone 2008; 43:3-6. [PMID: 18486581 DOI: 10.1016/j.bone.2008.03.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Revised: 03/10/2008] [Accepted: 03/16/2008] [Indexed: 02/07/2023]
Abstract
Diabetes and osteoporosis are both diseases of epidemic proportions whose incidence is increasing worldwide. The etiology of osteoporosis is multifactorial and may differ for type 1(T1DM) as compared to type 2 (T2DM). Fragility fractures are common to both types of diabetes with hip fractures occurring more frequently in the elderly T2DM population. The use of oral PPAR gamma agonists in the treatment of T2DM has also added to the risk of fracture. This perspective discusses the etiologies and issues relating to the association of diabetes with osteoporosis and fractures and suggests some theories to clarify the underlying pathophysiology. Unfortunately at this time treatment for osteoporosis and fractures remains empirical.
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Affiliation(s)
- Sol Epstein
- Mt. Sinai School of Medicine, Department Of Endocrinology, Diabetes and Bone Diseases, 1 Gustave Levy Place, New York, New York 10029, USA.
| | - Derek LeRoith
- Mt. Sinai School of Medicine, Department Of Endocrinology, Diabetes and Bone Diseases, 1 Gustave Levy Place, New York, New York 10029, USA
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Abstract
Thiazolidinediones (TZDs) are agonists of the peroxisome proliferator-activated receptor gamma (PPARgamma) nuclear transcription factor. Two members of this drug class, rosiglitazone and pioglitazone, are commonly used in the management of type II diabetes mellitus, and play emerging roles in the treatment of other clinical conditions characterized by insulin resistance. Over the past decade, a consistent body of in vitro and animal studies has demonstrated that PPARgamma signaling regulates the fate of pluripotent mesenchymal cells, favoring adipogenesis over osteoblastogenesis. Treatment of rodents with TZDs decreases bone formation and bone mass. Until recently, there were no bone-related data available from studies of TZDs in humans. In the past year, however, several clinical studies have reported adverse skeletal actions of TZDs in humans. Collectively, these investigations have demonstrated that the TZDs currently in clinical use decrease bone formation and accelerate bone loss in healthy and insulin-resistant individuals, and increase the risk of fractures in the appendicular skeleton in women with type II diabetes mellitus. These observations should prompt clinicians to evaluate fracture risk in patients for whom TZD therapy is being considered, and initiate skeletal protection in at-risk individuals.
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Affiliation(s)
- A Grey
- Department of Medicine, University of Auckland, Auckland, New Zealand.
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40
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Schwartz AV, Sellmeyer DE. Effect of thiazolidinediones on skeletal health in women with Type 2 diabetes. Expert Opin Drug Saf 2008; 7:69-78. [DOI: 10.1517/14740338.7.1.69] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ann V Schwartz
- University of California San Francisco, Department of Epidemiology and Biostatistics, 185 Berry Street, Suite 5700, San Francisco, CA 94107, USA ;
| | - Deborah E Sellmeyer
- University of California San Francisco, Division of Endocrinology and Metabolism, Department of Medicine, 185 Berry Street, Suite 5700, San Francisco, CA 94107, USA
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Berberoglu Z, Gursoy A, Bayraktar N, Yazici AC, Bascil Tutuncu N, Guvener Demirag N. Rosiglitazone decreases serum bone-specific alkaline phosphatase activity in postmenopausal diabetic women. J Clin Endocrinol Metab 2007; 92:3523-30. [PMID: 17595249 DOI: 10.1210/jc.2007-0431] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVES Our objectives were to evaluate the effect of rosiglitazone on bone metabolism and to assess the association between changes in bone turnover parameters and plasma cytokine levels in postmenopausal diabetic women. DESIGN This was a 12-wk open-label randomized-controlled trial. PATIENTS OR OTHER PARTICIPANTS A total of 56 obese postmenopausal women with newly diagnosed diabetes and 26 nondiabetic healthy controls matched for age and body mass index were included in the study. INTERVENTIONS The subjects were instructed to follow a weight-maintenance diet. Half were randomly assigned to receive rosiglitazone 4 mg/d, and the other half remained on diet alone. MAIN OUTCOME MEASURES Before and after the interventions, metabolic bone markers and serum cytokine levels were assessed. RESULTS Serum total alkaline phosphatase (ALP) and bone-specific ALP levels were statistically significantly lower 12 wk after initiation of rosiglitazone treatment. There were no statistically significant changes in osteocalcin levels among the three groups or in deoxypyridinoline levels in the rosiglitazone group. At the end of 12 wk, all patients had statistically significantly decreased IL-1beta and TNF-alpha levels compared with baseline. Changes in bone-specific ALP levels showed a moderate negative correlation with the changes in the TNF-alpha levels after rosiglitazone treatment and after diet in the diabetic control group. CONCLUSIONS Rosiglitazone use is associated with reduced bone formation at earlier stages in postmenopausal diabetic women. The cytokine-lowering effects of rosiglitazone and lifestyle changes could reverse the early inhibitory effect of rosiglitazone therapy on bone formation. Further studies will clarify the long-term effects of rosiglitazone therapy on bone loss and fracture.
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Affiliation(s)
- Zehra Berberoglu
- Department of Endocrinology and Metabolism, Baskent University Faculty of Medicine, 06490 Bahcelievler, Ankara, Turkey
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Pfützner A, Weber MM, Forst T. Pioglitazone: update on an oral antidiabetic drug with antiatherosclerotic effects. Expert Opin Pharmacother 2007; 8:1985-98. [PMID: 17696799 DOI: 10.1517/14656566.8.12.1985] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Pioglitazone, a member of the PPAR-gamma agonist drug family, has been demonstrated to improve both metabolic and vascular insulin resistance when applied to patients with Type 2 diabetes mellitus. The drug is well tolerated with fluid retention and weight gain being the most frequently described side effects. The observed effects (e.g., improvements in glucose and lipid metabolism, improvements of endothelial function and microcirculation, reduction of surrogate markers of atherosclerosis and inflammation and an improvement in hypertension) have made pioglitazone one of the frequently prescribed antidiabetic drugs in the US and Europe. Several trials have shown its potency to reduce carotid intima-media thickness, and outcome studies with pioglitazone have shown its potential to delay the progression of Type 2 diabetes and atherosclerosis and even reduce cardiovascular mortality. The purpose of this review is to provide an overview about recently published clinical results with pioglitazone. They underline the value of this drug when used alone or in combination with other antidiabetic drugs for a successful management of Type 2 diabetes mellitus.
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Affiliation(s)
- Andreas Pfützner
- IKFE-Institute for Clinical Research and Development, Mainz, Germany.
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Lazarenko OP, Rzonca SO, Hogue WR, Swain FL, Suva LJ, Lecka-Czernik B. Rosiglitazone induces decreases in bone mass and strength that are reminiscent of aged bone. Endocrinology 2007; 148:2669-80. [PMID: 17332064 PMCID: PMC2084459 DOI: 10.1210/en.2006-1587] [Citation(s) in RCA: 240] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Peroxisome proliferator-activated receptor-gamma (PPARgamma) regulates both glucose metabolism and bone mass. Recent evidence suggests that the therapeutic modulation of PPARgamma activity with antidiabetic thiazolidinediones elicits unwanted effects on bone. In this study, the effects of rosiglitazone on the skeleton of growing (1 month), adult (6 month), and aged (24 month) C57BL/6 mice were determined. Aging was identified as a confounding factor for rosiglitazone-induced bone loss that correlated with the increased expression of PPARgamma in bone marrow mesenchymal stem cells. The bone of young growing mice was least affected, although a significant decrease in bone formation rate was noted. In both adult and aged animals, bone volume was significantly decreased by rosiglitazone. In adult animals, bone loss correlated with attenuated bone formation, whereas in aged animals, bone loss was associated with increased osteoclastogenesis, mediated by increased receptor activator of nuclear factor-kappaB ligand (RANKL) expression. PPARgamma activation led to changes in marrow structure and function such as a decrease in osteoblast number, an increase in marrow fat cells, an increase in osteoclast number, and a loss of the multipotential character of marrow mesenchymal stem cells. In conclusion, rosiglitazone induces changes in bone reminiscent of aged bone and appears to induce bone loss by altering the phenotype of marrow mesenchymal stem cells.
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Affiliation(s)
- Oxana P. Lazarenko
- Department of Geriatrics, Reynolds Institute on Aging, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Sylwia O. Rzonca
- Department of Geriatrics, Reynolds Institute on Aging, University of Arkansas for Medical Sciences, Little Rock, USA
| | - William R. Hogue
- Orthopaedic Surgery, Center for Orthopaedic Research, Barton Research Institute, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Frances L. Swain
- Orthopaedic Surgery, Center for Orthopaedic Research, Barton Research Institute, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Larry J. Suva
- Orthopaedic Surgery, Center for Orthopaedic Research, Barton Research Institute, University of Arkansas for Medical Sciences, Little Rock, USA
| | - Beata Lecka-Czernik
- Department of Geriatrics, Reynolds Institute on Aging, University of Arkansas for Medical Sciences, Little Rock, USA
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Lartaud I, Gaillard V, Dauca M, Atkinson J. Importance de l’activation des PPARgamma dans la pharmacologie de la rigidité artérielle. ANNALES PHARMACEUTIQUES FRANÇAISES 2007; 65:189-94. [PMID: 17489075 DOI: 10.1016/s0003-4509(07)90035-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Specific treatment of age-related aortic wall arteriosclerosis and stiffening is lacking. As anti-inflammatory ligands for peroxisome proliferator-activated receptor-gamma have beneficial effects on the arterial wall in atherosclerosis, we investigated whether chronic pioglitazone treatment protects against another form of vascular wall disease, arteriosclerosis. In a rat model of elastocalcinotic arteriosclerosis (hypervitaminosis D and nicotine, VDN), we evaluated whether pioglitazone attenuated arteriosclerosis and its consequences, aortic wall rigidity, increased aortic pulse pressure and left ventricular hypertrophy. In VDN rats, medial calcification was associated with monocyte/macrophage infiltration and induction of TNF-alpha and IL-1B. Pioglitazone decreased TNF-alpha and IL-1B mRNA expression, blunted aortic wall calcification and prevented fragmentation of elastic fibers. Pioglitazone reduced aortic wall stiffness, aortic pulse pressure and left ventricular hypertrophy. Our results may be clinically relevant in elderly patients suffering from aortic wall stiffening and isolated systolic hypertension.
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Affiliation(s)
- I Lartaud
- Laboratoire de pharmacologie cardiovasculaire, Faculté de pharmacie, Université Henri Poincaré Nancy-1, 5 rue Albert Lebrun, F 54000 Nancy
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Grey A, Bolland M, Gamble G, Wattie D, Horne A, Davidson J, Reid IR. The peroxisome proliferator-activated receptor-gamma agonist rosiglitazone decreases bone formation and bone mineral density in healthy postmenopausal women: a randomized, controlled trial. J Clin Endocrinol Metab 2007; 92:1305-10. [PMID: 17264176 DOI: 10.1210/jc.2006-2646] [Citation(s) in RCA: 305] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
CONTEXT Thiazolidinediones, which are peroxisome proliferator-activated receptor-gamma agonists, are widely prescribed to patients with disorders characterized by insulin resistance. Preclinical studies suggest that peroxisome proliferator-activated receptor-gamma signaling negatively regulates bone formation and bone density. Human data on the skeletal effects of thiazolidinediones are currently available only from observational studies. OBJECTIVE The objective of the study was to determine whether rosiglitazone, a thiazolidinedione, inhibits bone formation. DESIGN The study was a 14-wk randomized, double-blind, placebo-controlled trial. SETTING The study was conducted in the general community. PATIENTS Fifty healthy, postmenopausal women participated in the study. INTERVENTION Intervention was rosiglitazone 8 mg/d. MAIN OUTCOME MEASURES The primary end point was biochemical markers of bone formation, and secondary end points were a bone resorption marker and bone mineral density. RESULTS The osteoblast markers procollagen type I N-terminal propeptide and osteocalcin declined by 13% (P<0.005 vs. placebo) and 10% (P=0.04 vs. placebo), respectively, in the rosiglitazone group. These changes were evident by 4 wk and persisted for the duration of the study. There was no change in the serum beta-C-terminal telopeptide of type I collagen, a marker of bone resorption (P=0.9 vs. placebo). Total hip bone density fell in the rosiglitazone group (mean change from baseline rosiglitazone -1.9%, placebo -0.2%; between-group difference 1.7%, 95% confidence interval 0.6-2.7, P<0.01); lumbar spine bone density fell significantly from baseline values in the rosiglitazone group (P=0.02 vs. baseline) but was not significantly different between groups (mean change from baseline rosiglitazone -1.2%, placebo -0.2%; between-group difference 1.0%, 95% confidence interval -0.2-2.3, P=0.13). CONCLUSIONS Short-term therapy with rosiglitazone exerts detrimental skeletal effects by inhibiting bone formation. Skeletal end points should be included in future long-term studies of thiazolidinedione use.
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Affiliation(s)
- Andrew Grey
- Department of Medicine, University of Auckland, and LabPlus, Auckland City Hospital, New Zealand.
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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: 0.5] [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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Haider DG, Mittermayer F, Schaller G, Artwohl M, Baumgartner-Parzer SM, Prager G, Roden M, Wolzt M. Free fatty acids normalize a rosiglitazone-induced visfatin release. Am J Physiol Endocrinol Metab 2006; 291:E885-90. [PMID: 16735449 DOI: 10.1152/ajpendo.00109.2006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The detrimental effect of elevated free fatty acids (FFAs) on insulin sensitivity can be improved by thiazolidinediones (TZDs) in patients with type 2 diabetes mellitus. It is unknown whether this salutary action of TZD is associated with altered release of the insulin-mimetic adipocytokine visfatin. In this study, we investigated whether visfatin concentrations are altered by FFA and TZD treatment. In a randomized, double-blind, placebo-controlled, parallel-group study 16 healthy volunteers received an infusion of triglycerides/heparin to increase plasma FFA after 3 wk of treatment with rosiglitazone (8 mg/day, n = 8) or placebo (n = 8), and circulating plasma visfatin was measured. As a corollary, human adipocytes were incubated with synthetic fatty acids and rosiglitazone to assess visfatin release in vitro. The results were that rosiglitazone treatment increased systemic plasma visfatin concentrations from 0.6 +/- 0.1 to 1.7 +/- 0.2 ng/ml (P < 0.01). Lipid infusion caused a marked elevation of plasma FFA but had no effect on circulating visfatin in controls. In contrast, elevated visfatin concentrations in subjects receiving rosiglitazone were normalized by lipid infusion. In isolated adipocytes, visfatin was released into supernatant medium by acute addition and long-term treatment of rosiglitazone. This secretion was blocked by synthetic fatty acids and by inhibition of phosphatidylinositol 3-kinase or Akt. In conclusion, release of the insulin-mimetic visfatin may represent a major mechanism of metabolic TZD action. The presence of FFA antagonizes this action, which may have implications for visfatin bioactivity.
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Affiliation(s)
- Dominik G Haider
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
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Bäckesjö CM, Li Y, Lindgren U, Haldosén LA. Activation of Sirt1 decreases adipocyte formation during osteoblast differentiation of mesenchymal stem cells. J Bone Miner Res 2006; 21:993-1002. [PMID: 16813520 DOI: 10.1359/jbmr.060415] [Citation(s) in RCA: 203] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
UNLABELLED In vitro, mesenchymal stem cells differentiate to osteoblasts when exposed to bone-inducing medium. However, adipocytes are also formed. We showed that activation of the nuclear protein deacetylase Sirt1 reduces adipocyte formation and promotes osteoblast differentiation. INTRODUCTION Mesenchymal stem cells (MSCs) can differentiate into osteoblasts, adipocytes, chondrocytes, and myoblasts. It has been suggested that a reciprocal relationship exists between the differentiation of MSCs into osteoblasts and adipocytes. Peroxisome proliferator-activated receptor gamma2 (PPARgamma2) is a key element for the differentiation into adipocytes. Activation of Sirt1 has recently been shown to decrease adipocyte development from preadipocytes through inhibition of PPARgamma2. MATERIALS AND METHODS We used the mouse mesenchymal cell line C3H10T1/2 and primary rat bone marrow cells cultured in osteoblast differentiation medium with or without reagents affecting Sirt1 activity. Adipocyte levels were analyzed by light microscopy and flow cytometry (FACS) after staining with Oil red O and Nile red, respectively. Osteoblast and adipocyte markers were studied with quantitative real-time PCR. Mineralization in cultures of primary rat bone marrow stromal cells was studied by von Kossa and alizarin red staining. RESULTS We found that Sirt1 is expressed in the mesenchymal cell line C3H10T1/2. Treatment with the plant polyphenol resveratrol as well as isonicotinamide, both of which activate Sirt1, blocked adipocyte development and increased the expression of osteoblast markers. Nicotinamide, which inhibits Sirt1, increased adipocyte number and increased expression of adipocyte markers. Furthermore, activation of Sirt1 prevented the increase in adipocytes caused by the PPARgamma-agonist troglitazone. Finally, activation of Sirt1 in rat primary bone marrow stromal cells increased expression of osteoblast markers and also mineralization. CONCLUSIONS In this study, we targeted Sirt1 to control adipocyte development during differentiation of MSCs into osteoblasts. The finding that resveratrol and isonicotinamide markedly inhibited adipocyte and promoted osteoblast differentiation may be relevant in the search for new treatment regimens of osteoporosis but also important for the evolving field of cell-based tissue engineering.
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Affiliation(s)
- Carl-Magnus Bäckesjö
- Department for Clinical Science, Intervention and Technology (CLINTEC), Division of Orthopedics, Karolinska Institutet, Karolinska University Hospital, Huddinge, Sweden.
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Lecka-Czernik B, Suva LJ. Resolving the Two "Bony" Faces of PPAR-gamma. PPAR Res 2006; 2006:27489. [PMID: 17259664 PMCID: PMC1679961 DOI: 10.1155/ppar/2006/27489] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Revised: 07/18/2006] [Accepted: 07/19/2006] [Indexed: 12/18/2022] Open
Abstract
Bone loss with aging results from attenuated and unbalanced bone turnover that has been associated with a decreased number of bone forming osteoblasts, an increased number of bone resorbing osteoclasts, and an increased number of adipocytes (fat cells) in the bone marrow. Osteoblasts and adipocytes are derived from marrow mesenchymal stroma/stem cells (MSC). The milieu of intracellular and extracellular signals that controls MSC lineage allocation is diverse. The adipocyte-specific transcription factor peroxisome proliferator-activated receptor-gamma (PPAR-gamma) acts as a critical positive regulator of marrow adipocyte formation and as a negative regulator of osteoblast development. In vivo, increased PPAR-gamma activity leads to bone loss, similar to the bone loss observed with aging, whereas decreased PPAR-gamma activity results in increased bone mass. Emerging evidence suggests that the pro-adipocytic and the anti-osteoblastic properties of PPAR-gamma are ligand-selective, suggesting the existence of multiple mechanisms by which PPAR-gamma controls bone mass and fat mass in bone.
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Affiliation(s)
- Beata Lecka-Czernik
- Department of Geriatrics, Reynolds Institute on Aging, University of Arkansas for Medical Sciences, 629 Jack Stephens Drive,
Little Rock, AR 72205, USA
| | - Larry J. Suva
- Department of Orthopaedic Surgery, Center for Orthopaedic Research, University of Arkansas for Medical Sciences,
Little Rock, AR 72205, USA
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50
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Schwab AM, Granholm S, Persson E, Wilkes B, Lerner UH, Conaway HH. Stimulation of resorption in cultured mouse calvarial bones by thiazolidinediones. Endocrinology 2005; 146:4349-61. [PMID: 15994344 DOI: 10.1210/en.2005-0601] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Dosage-dependent release of 45Ca was observed from prelabeled mouse calvarial bones after treatment with two thiazolidinediones, troglitazone and ciglitazone. Release of 45Ca by ciglitazone was decreased by the osteoclast inhibitors acetazolamide, calcitonin, 3-amino-1-hydroxypropylidene-1,1-bisphosphonate, and IL-4, but not affected by the peroxisome proliferator-activated receptor gamma antagonist, GW 9662, the mitotic inhibitor, hydroxyurea, or indomethacin. Enhanced expression of receptor activator of nuclear factor-kappaB ligand (RANKL) mRNA and protein and decreased osteoprotegerin (OPG) mRNA and protein were noted after ciglitazone treatment of calvariae. Ciglitazone and RANKL each caused increased mRNA expression of osteoclast markers: calcitonin receptor, tartrate-resistant acid phosphatase, cathepsin K, matrix metalloproteinase-9, integrin beta3, and nuclear factor of activated T cells 2. OPG inhibited mRNA expression of RANKL stimulated by ciglitazone, mRNA expression of osteoclast markers stimulated by ciglitazone and RANKL, and 45Ca release stimulated by troglitazone and ciglitazone. Increased expression of IL-1alpha mRNA by ciglitazone was not linked to resorption stimulated by the thiazolidinedione. Ciglitazone did not increase adipogenic gene expression but enhanced osteocalcin mRNA in calvariae. In addition to exhibiting sensitivity to OPG, data indicate that stimulation of osteoclast differentiation and activity by thiazolidinediones may occur by a nonperoxisome proliferator-activated receptor gamma-dependent pathway that does not require cell proliferation, prostaglandins, or IL-1alpha but is characterized by an increased RANKL to OPG ratio.
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Affiliation(s)
- A M Schwab
- Department of Physiology and Biophysics, University of Arkansas for Medical Sciences, 4301 West Markham Street, Slot 505, Little Rock, Arkansas 72205, USA
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