101
|
Hartmann K, Koenen M, Schauer S, Wittig-Blaich S, Ahmad M, Baschant U, Tuckermann JP. Molecular Actions of Glucocorticoids in Cartilage and Bone During Health, Disease, and Steroid Therapy. Physiol Rev 2016; 96:409-47. [PMID: 26842265 DOI: 10.1152/physrev.00011.2015] [Citation(s) in RCA: 141] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Cartilage and bone are severely affected by glucocorticoids (GCs), steroid hormones that are frequently used to treat inflammatory diseases. Major complications associated with long-term steroid therapy include impairment of cartilaginous bone growth and GC-induced osteoporosis. Particularly in arthritis, GC application can increase joint and bone damage. Contrarily, endogenous GC release supports cartilage and bone integrity. In the last decade, substantial progress in the understanding of the molecular mechanisms of GC action has been gained through genome-wide binding studies of the GC receptor. These genomic approaches have revolutionized our understanding of gene regulation by ligand-induced transcription factors in general. Furthermore, specific inactivation of GC signaling and the GC receptor in bone and cartilage cells of rodent models has enabled the cell-specific effects of GCs in normal tissue homeostasis, inflammatory bone diseases, and GC-induced osteoporosis to be dissected. In this review, we summarize the current view of GC action in cartilage and bone. We further discuss future research directions in the context of new concepts for optimized steroid therapies with less detrimental effects on bone.
Collapse
Affiliation(s)
- Kerstin Hartmann
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Mascha Koenen
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Sebastian Schauer
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Stephanie Wittig-Blaich
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Mubashir Ahmad
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Ulrike Baschant
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| | - Jan P Tuckermann
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany; and Division of Endocrinology, Diabetes, and Bone Diseases, Department of Medicine III, Technische Universität Dresden, Dresden, Germany
| |
Collapse
|
102
|
Toscani D, Palumbo C, Dalla Palma B, Ferretti M, Bolzoni M, Marchica V, Sena P, Martella E, Mancini C, Ferri V, Costa F, Accardi F, Craviotto L, Aversa F, Giuliani N. The Proteasome Inhibitor Bortezomib Maintains Osteocyte Viability in Multiple Myeloma Patients by Reducing Both Apoptosis and Autophagy: A New Function for Proteasome Inhibitors. J Bone Miner Res 2016; 31:815-27. [PMID: 26551485 DOI: 10.1002/jbmr.2741] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 11/06/2015] [Accepted: 11/08/2015] [Indexed: 11/11/2022]
Abstract
Multiple myeloma (MM) is characterized by severely imbalanced bone remodeling. In this study, we investigated the potential effect of proteasome inhibitors (PIs), a class of drugs known to stimulate bone formation, on the mechanisms involved in osteocyte death induced by MM cells. First, we performed a histological analysis of osteocyte viability on bone biopsies on a cohort of 37 MM patients with symptomatic disease. A significantly higher number of viable osteocytes was detected in patients treated with a bortezomib (BOR)-based regimen compared with those treated without BOR. Interestingly, both osteocyte autophagy and apoptosis were affected in vivo by BOR treatment. Thereafter, we checked the in vitro effect of BOR to understand the mechanisms whereby BOR maintains osteocyte viability in bone from MM patients. We found that osteocyte and preosteocyte autophagic death was triggered during coculturing with MM cells. Our evaluation was conducted by analyzing either autophagy markers microtubule-associated protein light chain 3 beta (LC3B) and SQSTM1/sequestome 1 (p62) levels, or the cell ultrastructure by transmission electron microscopy. PIs were found to increase the basal levels of LC3 expression in the osteocytes while blunting the myeloma-induced osteocyte death. PIs also reduced the autophagic death of osteocytes induced by high-dose dexamethasone (DEX) and potentiated the anabolic effect of PTH(1-34). Our data identify osteocyte autophagy as a new potential target in MM bone disease and support the use of PIs to maintain osteocyte viability and improve bone integrity in MM patients.
Collapse
Affiliation(s)
- Denise Toscani
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Carla Palumbo
- Department of Biomedical, Metabolic, and Neural Sciences, Section of Human Morphology, University of Modena and Reggio Emilia, Modena, Italy
| | - Benedetta Dalla Palma
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.,Hematology Unit, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| | - Marzia Ferretti
- Department of Biomedical, Metabolic, and Neural Sciences, Section of Human Morphology, University of Modena and Reggio Emilia, Modena, Italy
| | - Marina Bolzoni
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Valentina Marchica
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Paola Sena
- Department of Biomedical, Metabolic, and Neural Sciences, Section of Human Morphology, University of Modena and Reggio Emilia, Modena, Italy
| | - Eugenia Martella
- Pathology, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| | - Cristina Mancini
- Pathology, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| | - Valentina Ferri
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.,Department of Biotechnology and Life Sciences, University of Insubria, Varese, Italy
| | - Federica Costa
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Fabrizio Accardi
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.,Hematology Unit, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| | - Luisa Craviotto
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - Franco Aversa
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.,Hematology Unit, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| | - Nicola Giuliani
- Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy.,Hematology Unit, "Azienda Ospedaliero-Universitaria di Parma", Parma, Italy
| |
Collapse
|
103
|
Evaluation of the effects of pulsed wave LLLT on tibial diaphysis in two rat models of experimental osteoporosis, as examined by stereological and real-time PCR gene expression analyses. Lasers Med Sci 2016; 31:721-32. [PMID: 26964799 DOI: 10.1007/s10103-016-1916-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 02/19/2016] [Indexed: 12/17/2022]
Abstract
Osteoporosis (OP) and osteoporotic fracture are major public health issues for society; the burden for the affected individual is also high. Previous studies have shown that pulsed wave low-level laser therapy (PW LLLT) has osteogenic effects. This study intended to evaluate the impacts of PW LLLT on the cortical bone of osteoporotic rats' tibias in two experimental models, ovariectomized and dexamethasone-treated. We divided the rats into four ovariectomized induced OP (OVX-d) and four dexamethasone-treated (glucocorticoid-induced OP, GIOP) groups. A healthy (H) group of rats was considered for baseline evaluations. At 14 weeks following ovariectomy, we subdivided the OVX-d rats into the following groups: (i) control which had OP, (ii) OVX-d rats treated with alendronate (1 mg/kg), (iii) OVX-d rats treated with LLLT, and (iv) OVX-d rats treated with alendronate and PW LLLT. The remaining rats received dexamethasone over a 5-week period and were also subdivided into four groups: (i) control rats treated with intramuscular (i.m.) injections of distilled water (vehicle), (ii) rats treated with subcutaneous alendronate injections (1 mg/kg), (iii) laser-treated rats, and (iv) rats simultaneously treated with laser and alendronate. The rats received alendronate for 30 days and underwent PW LLLT (890 nm, 80 Hz, 0.972 J/cm(2)) three times per week during 8 weeks. Then, the right tibias were extracted and underwent a stereological analysis of histological parameters and real-time polymerase chain reaction (RT-PCR). A significant increase in cortical bone volume (mm(3)) existed in all study groups compared to the healthy rats. There were significant decreases in trabecular bone volume (mm(3)) in all study groups compared to the group of healthy rats. The control rats with OP and rats from the vehicle group showed significantly increased osteoclast numbers compared to most other groups. Alendronate significantly decreased osteoclast numbers in osteoporotic rats. Concurrent treatments (compounded by PW LLLT and alendronate) produce the same effect on osteoporotic bone.
Collapse
|
104
|
Nango N, Kubota S, Hasegawa T, Yashiro W, Momose A, Matsuo K. Osteocyte-directed bone demineralization along canaliculi. Bone 2016; 84:279-288. [PMID: 26709236 DOI: 10.1016/j.bone.2015.12.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 11/30/2015] [Accepted: 12/16/2015] [Indexed: 12/22/2022]
Abstract
The mammalian skeleton stores calcium and phosphate ions in bone matrix. Osteocytes in osteocyte lacunae extend numerous dendrites into canaliculi less than a micron in diameter and which are distributed throughout bone matrix. Although osteoclasts are the primary bone-resorbing cells, osteocytes also reportedly dissolve hydroxyapatite at peri-lacunar bone matrix. However, robust three-dimensional evidence for peri-canalicular bone mineral dissolution has been lacking. Here we applied a previously reported Talbot-defocus multiscan tomography method for synchrotron X-ray microscopy and analyzed the degree of bone mineralization in mouse cortical bone around the lacuno-canalicular network, which is connected both to blood vessels and the peri- and endosteum. We detected cylindrical low mineral density regions spreading around canaliculi derived from a subset of osteocytes. Transmission electron microscopy revealed both intact and demineralized bone matrix around the canaliculus. Peri-canalicular low mineral density regions were also observed in osteopetrotic mice lacking osteoclasts, indicating that osteoclasts are dispensable for peri-canalicular demineralization. These data suggest demineralization can occur from within bone through the canalicular system, and that peri-canalicular demineralization occurs not uniformly but directed by individual osteocytes. Blockade of peri-canalicular demineralization may be a therapeutic strategy to increase bone mass and quality.
Collapse
Affiliation(s)
- Nobuhito Nango
- Ratoc System Engineering Co., Ltd, Tokyo 112-0014, Japan.
| | - Shogo Kubota
- Ratoc System Engineering Co., Ltd, Tokyo 112-0014, Japan.
| | - Tomoka Hasegawa
- Department of Developmental Biology of Hard Tissue, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan.
| | - Wataru Yashiro
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Miyagi 980-8577, Japan.
| | - Atsushi Momose
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Miyagi 980-8577, Japan.
| | - Koichi Matsuo
- Laboratory of Cell and Tissue Biology, Keio University School of Medicine, Tokyo 160-8582, Japan.
| |
Collapse
|
105
|
Karunaratne A, Xi L, Bentley L, Sykes D, Boyde A, Esapa CT, Terrill NJ, Brown SDM, Cox RD, Thakker RV, Gupta HS. Multiscale alterations in bone matrix quality increased fragility in steroid induced osteoporosis. Bone 2016; 84:15-24. [PMID: 26657825 PMCID: PMC4764652 DOI: 10.1016/j.bone.2015.11.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 10/30/2015] [Accepted: 11/27/2015] [Indexed: 12/31/2022]
Abstract
A serious adverse clinical effect of glucocorticoid steroid treatment is secondary osteoporosis, enhancing fracture risk in bone. This rapid increase in bone fracture risk is largely independent of bone loss (quantity), and must therefore arise from degradation of the quality of the bone matrix at the micro- and nanoscale. However, we lack an understanding of both the specific alterations in bone quality n steroid-induced osteoporosis as well as the mechanistic effects of these changes. Here we demonstrate alterations in the nanostructural parameters of the mineralized fibrillar collagen matrix, which affect bone quality, and develop a model linking these to increased fracture risk in glucocorticoid induced osteoporosis. Using a mouse model with an N-ethyl-N-nitrosourea (ENU)-induced corticotrophin releasing hormone promoter mutation (Crh(-120/+)) that developed hypercorticosteronaemia and osteoporosis, we utilized in situ mechanical testing with small angle X-ray diffraction, synchrotron micro-computed tomography and quantitative backscattered electron imaging to link altered nano- and microscale deformation mechanisms in the bone matrix to abnormal macroscopic mechanics. We measure the deformation of the mineralized collagen fibrils, and the nano-mechanical parameters including effective fibril modulus and fibril to tissue strain ratio. A significant reduction (51%) of fibril modulus was found in Crh(-120/+) mice. We also find a much larger fibril strain/tissue strain ratio in Crh(-120/+) mice (~1.5) compared to the wild-type mice (~0.5), indicative of a lowered mechanical competence at the nanoscale. Synchrotron microCT show a disruption of intracortical architecture, possibly linked to osteocytic osteolysis. These findings provide a clear quantitative demonstration of how bone quality changes increase macroscopic fragility in secondary osteoporosis.
Collapse
Affiliation(s)
- A Karunaratne
- Queen Mary University of London, School of Engineering and Material Science, Mile End Road, London E1 4NS, UK.
| | - L Xi
- Queen Mary University of London, School of Engineering and Material Science, Mile End Road, London E1 4NS, UK.
| | - L Bentley
- MRC Mammalian Genetics Unit and Mary Lyon Centre, MRC Harwell, Harwell Science and Innovation Campus, OX11 0RD, UK.
| | - D Sykes
- Core Research Laboratories, The Natural History Museum, London SW7 5BD, UK.
| | - A Boyde
- Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, E1 2AD, UK.
| | - C T Esapa
- MRC Mammalian Genetics Unit and Mary Lyon Centre, MRC Harwell, Harwell Science and Innovation Campus, OX11 0RD, UK; Academic Endocrine Unit, Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), University of Oxford, Churchill Hospital, Headington, Oxford OX3 7JL, UK.
| | - N J Terrill
- Diamond Light Source Ltd., Beamline I22, Diamond House, Harwell Science and Innovation Campus, Chilton, Didcot, Oxfordshire, OX11 0DE, UK; Department of Chemistry, University of Sheffield, Dainton Building, Brookhill, Sheffield S3 7HF, UK.
| | - S D M Brown
- MRC Mammalian Genetics Unit and Mary Lyon Centre, MRC Harwell, Harwell Science and Innovation Campus, OX11 0RD, UK.
| | - R D Cox
- MRC Mammalian Genetics Unit and Mary Lyon Centre, MRC Harwell, Harwell Science and Innovation Campus, OX11 0RD, UK.
| | - R V Thakker
- Academic Endocrine Unit, Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), University of Oxford, Churchill Hospital, Headington, Oxford OX3 7JL, UK.
| | - H S Gupta
- Queen Mary University of London, School of Engineering and Material Science, Mile End Road, London E1 4NS, UK.
| |
Collapse
|
106
|
Yao W, Dai W, Jiang L, Lay EYA, Zhong Z, Ritchie RO, Li X, Ke H, Lane NE. Sclerostin-antibody treatment of glucocorticoid-induced osteoporosis maintained bone mass and strength. Osteoporos Int 2016; 27:283-294. [PMID: 26384674 PMCID: PMC4958115 DOI: 10.1007/s00198-015-3308-6] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 08/25/2015] [Indexed: 12/18/2022]
Abstract
UNLABELLED This study was to determine if antibody against sclerostin (Scl-Ab) could prevent glucocorticoid (GC)-induced osteoporosis in mice. We found that Scl-Ab prevented GC-induced reduction in bone mass and bone strength and that the anabolic effects of Scl-Ab might be partially achieved through the preservation of osteoblast activity through autophagy. INTRODUCTION Glucocorticoids (GCs) inhibit bone formation by altering osteoblast and osteocyte cell activity and lifespan. A monoclonal antibody against sclerostin, Scl-Ab, increased bone mass in both preclinical animal and clinical studies in subjects with low bone mass. The objectives of this study were to determine if treatment with the Scl-Ab could prevent loss of bone mass and strength in a mouse model of GC excess and to elucidate if Scl-Ab modulated bone cell activity through autophagy. METHODS We generated reporter mice that globally expressed dsRed fused to LC3, a protein marker for autophagosomes, and evaluated the dose-dependent effects of GCs (0, 0.8, 2.8, and 4 mg/kg/day) and Scl-Ab on autophagic osteoblasts, bone mass, and bone strength. RESULTS GC treatment at 2.8 and 4 mg/kg/day of methylprednisolone significantly lowered trabecular bone volume (Tb-BV/TV) at the lumbar vertebrae and distal femurs, cortical bone mass at the mid-shaft femur (FS), and cortical bone strength compared to placebo (PL). In mice treated with GC and Scl-Ab, Tb-BV/TV increased by 60-125 %, apparent bone strength of the lumbar vertebrae by 30-70 %, FS-BV by 10-18 %, and FS-apparent strength by 13-15 %, as compared to GC vehicle-treated mice. GC treatment at 4 mg/kg/day reduced the number of autophagic osteoblasts by 70 % on the vertebral trabecular bone surface compared to the placebo group (PL, GC 0 mg), and GC + Scl-Ab treatment. CONCLUSIONS Treatment with Scl-Ab prevented GC-induced reduction in both trabecular and cortical bone mass and strength and appeared to maintain osteoblast activity through autophagy.
Collapse
Affiliation(s)
- W. Yao
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - W. Dai
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
- Science and Technology Experimental Center, Integrative Medicine Discipline, Longhua Hospital Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - L. Jiang
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - E. Y.-A. Lay
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Z. Zhong
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - R. O. Ritchie
- Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA 94720, USA
| | - X. Li
- Department of Metabolic Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - H. Ke
- Department of Metabolic Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - N. E. Lane
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| |
Collapse
|
107
|
Verbruggen SW, Mc Garrigle MJ, Haugh MG, Voisin MC, McNamara LM. Altered mechanical environment of bone cells in an animal model of short- and long-term osteoporosis. Biophys J 2016; 108:1587-1598. [PMID: 25863050 DOI: 10.1016/j.bpj.2015.02.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 01/28/2015] [Accepted: 02/03/2015] [Indexed: 01/18/2023] Open
Abstract
Alterations in bone tissue composition during osteoporosis likely disrupt the mechanical environment of bone cells and may thereby initiate a mechanobiological response. It has proved challenging to characterize the mechanical environment of bone cells in vivo, and the mechanical environment of osteoporotic bone cells is not known. The objective of this research is to characterize the local mechanical environment of osteocytes and osteoblasts from healthy and osteoporotic bone in a rat model of osteoporosis. Using a custom-designed micromechanical loading device, we apply strains representative of a range of physical activity (up to 3000 με) to fluorescently stained femur samples from normal and ovariectomized rats. Confocal imaging was simultaneously performed, and digital image correlation techniques were applied to characterize cellular strains. In healthy bone tissue, osteocytes experience higher maximum strains (31,028 ± 4213 με) than osteoblasts (24,921 ± 3,832 με), whereas a larger proportion of the osteoblast experiences strains >10,000 με. Most interestingly, we show that osteoporotic bone cells experience similar or higher maximum strains than healthy bone cells after short durations of estrogen deficiency (5 weeks), and exceeded the osteogenic strain threshold (10,000 με) in a similar or significantly larger proportion of the cell (osteoblast, 12.68% vs. 13.68%; osteocyte, 15.74% vs. 5.37%). However, in long-term estrogen deficiency (34 weeks), there was no significant difference between bone cells in healthy and osteoporotic bone. These results suggest that the mechanical environment of bone cells is altered during early-stage osteoporosis, and that mechanobiological responses act to restore the mechanical environment of the bone tissue after it has been perturbed by ovariectomy.
Collapse
Affiliation(s)
- Stefaan W Verbruggen
- Biomechanics Research Centre, National Centre for Biomedical Engineering Science, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
| | - Myles J Mc Garrigle
- Biomechanics Research Centre, National Centre for Biomedical Engineering Science, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
| | - Matthew G Haugh
- Biomechanics Research Centre, National Centre for Biomedical Engineering Science, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
| | - Muriel C Voisin
- Biomechanics Research Centre, National Centre for Biomedical Engineering Science, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
| | - Laoise M McNamara
- Biomechanics Research Centre, National Centre for Biomedical Engineering Science, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
| |
Collapse
|
108
|
Consolaro A. Miniplates and mini-implants: bone remodeling as their biological foundation. Dental Press J Orthod 2015; 20:16-31. [PMID: 26691966 PMCID: PMC4686741 DOI: 10.1590/2177-6709.20.6.016-031.oin] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 10/14/2015] [Indexed: 11/21/2022] Open
Abstract
The tridimensional network formed by osteocytes controls bone design by coordinating cell activity on trabecular and cortical bone surfaces, especially osteoblasts and clasts. Miniplates and mini-implants provide anchorage, allowing all other orthodontic and orthopedic components, albeit afar, to deform and stimulate the network of osteocytes to command bone design remodeling upon "functional demand" established by force and its vectors. By means of transmission of forces, whether near or distant, based on anchorage provided by miniplates, it is possible to change the position, shape and size as well as the relationship established between the bones of the jaws. Understanding bone biology and the continuous remodeling of the skeleton allows the clinician to perform safe and accurate rehabilitation treatment of patients, thus increasing the possibilities and types of intervention procedures to be applied in order to restore patient's esthetics and function.
Collapse
Affiliation(s)
- Alberto Consolaro
- School of Dentistry, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| |
Collapse
|
109
|
Javaheri B, Carriero A, Staines KA, Chang YM, Houston DA, Oldknow KJ, Millan JL, Kazeruni BN, Salmon P, Shefelbine S, Farquharson C, Pitsillides AA. Phospho1 deficiency transiently modifies bone architecture yet produces consistent modification in osteocyte differentiation and vascular porosity with ageing. Bone 2015; 81:277-291. [PMID: 26232374 PMCID: PMC4652607 DOI: 10.1016/j.bone.2015.07.035] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 07/24/2015] [Accepted: 07/27/2015] [Indexed: 12/11/2022]
Abstract
PHOSPHO1 is one of principal proteins involved in initiating bone matrix mineralisation. Recent studies have found that Phospho1 KO mice (Phospho1-R74X) display multiple skeletal abnormalities with spontaneous fractures, bowed long bones, osteomalacia and scoliosis. These analyses have however been limited to young mice and it remains unclear whether the role of PHOSPHO1 is conserved in the mature murine skeleton where bone turnover is limited. In this study, we have used ex-vivo computerised tomography to examine the effect of Phospho1 deletion on tibial bone architecture in mice at a range of ages (5, 7, 16 and 34 weeks of age) to establish whether its role is conserved during skeletal growth and maturation. Matrix mineralisation has also been reported to influence terminal osteoblast differentiation into osteocytes and we have also explored whether hypomineralised bones in Phospho1 KO mice exhibit modified osteocyte lacunar and vascular porosity. Our data reveal that Phospho1 deficiency generates age-related defects in trabecular architecture and compromised cortical microarchitecture with greater porosity accompanied by marked alterations in osteocyte shape, significant increases in osteocytic lacuna and vessel number. Our in vitro studies examining the behaviour of osteoblast derived from Phospho1 KO and wild-type mice reveal reduced levels of matrix mineralisation and modified osteocytogenic programming in cells deficient in PHOSPHO1. Together our data suggest that deficiency in PHOSPHO1 exerts modifications in bone architecture that are transient and depend upon age, yet produces consistent modification in lacunar and vascular porosity. It is possible that the inhibitory role of PHOSPHO1 on osteocyte differentiation leads to these age-related changes in bone architecture. It is also intriguing to note that this apparent acceleration in osteocyte differentiation evident in the hypomineralised bones of Phospho1 KO mice suggests an uncoupling of the interplay between osteocytogenesis and biomineralisation. Further studies are required to dissect the molecular processes underlying the regulatory influences exerted by PHOSPHO1 on the skeleton with ageing.
Collapse
Affiliation(s)
- B Javaheri
- The Royal Veterinary College, London, United Kingdom.
| | - A Carriero
- Department of Biomedical Engineering, Florida Institute of Technology Melbourne, FL 32901, USA
| | - K A Staines
- The Roslin Institute and R(D)SVS, University of Edinburgh, Edinburgh, United Kingdom
| | - Y-M Chang
- The Royal Veterinary College, London, United Kingdom
| | - D A Houston
- The Roslin Institute and R(D)SVS, University of Edinburgh, Edinburgh, United Kingdom
| | - K J Oldknow
- The Roslin Institute and R(D)SVS, University of Edinburgh, Edinburgh, United Kingdom
| | - J L Millan
- Sanford Children's Health Research Center, Sanford-Burnham Medical Research Institute, La Jolla, CA, USA
| | | | - P Salmon
- Bruker-microCT, Kartuizersweg 3B, 2550 Kontich, Belgium
| | - S Shefelbine
- Department of Mechanical and Industrial Engineering, Northeastern University, USA
| | - C Farquharson
- The Roslin Institute and R(D)SVS, University of Edinburgh, Edinburgh, United Kingdom
| | | |
Collapse
|
110
|
Achiou Z, Toumi H, Touvier J, Boudenot A, Uzbekov R, Ominsky MS, Pallu S, Lespessailles E. Sclerostin antibody and interval treadmill training effects in a rodent model of glucocorticoid-induced osteopenia. Bone 2015; 81:691-701. [PMID: 26409255 DOI: 10.1016/j.bone.2015.09.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 09/05/2015] [Accepted: 09/17/2015] [Indexed: 12/25/2022]
Abstract
Glucocorticoids have a beneficial anti-inflammatory and immunosuppressive effect, but their use is associated with decreased bone formation, bone mass and bone quality, resulting in an elevated fracture risk. Exercise and sclerostin antibody (Scl-Ab) administration have both been shown to increase bone formation and bone mass, therefore the ability of these treatments to inhibit glucocorticoid-induced osteopenia alone or in combination were assessed in a rodent model. Adult (4 months-old) male Wistar rats were allocated to a control group (C) or one of 4 groups injected subcutaneously with methylprednisolone (5mg/kg/day, 5 days/week). Methylprednisolone treated rats were injected subcutaneously 2 days/week with vehicle (M) or Scl-Ab-VI (M+S: 25mg/kg/day) and were submitted or not to treadmill interval training exercise (1h/day, 5 days/week) for 9 weeks (M+E, M+E+S). Methylprednisolone treatment increased % fat mass and % apoptotic osteocytes, reduced whole body and femoral bone mineral content (BMC), reduced femoral bone mineral density (BMD) and osteocyte lacunae occupancy. This effect was associated with lower trabecular bone volume (BV/TV) at the distal femur. Exercise increased BV/TV, osteocyte lacunae occupancy, while reducing fat mass, the bone resorption marker NTx, and osteocyte apoptosis. Exercise did not affect BMC or cortical microarchitectural parameters. Scl-Ab increased the bone formation marker osteocalcin and prevented the deleterious effects of M on bone mass, further increasing BMC, BMD and BV/TV to levels above the C group. Scl-Ab increased femoral cortical bone parameters at distal part and midshaft. Scl-Ab prevented the decrease in osteocyte lacunae occupancy and the increase in osteocyte apoptosis induced by M. The addition of exercise to Scl-Ab treatment did not result in additional improvements in bone mass or bone strength parameters. These data suggest that although our exercise regimen did prevent some of the bone deleterious effects of glucocorticoid treatment, particularly in trabecular bone volume and osteocyte apoptosis, Scl-Ab treatment resulted in marked improvements in bone mass across the skeleton and in osteocyte viability, resulting in decreased bone fragility.
Collapse
Affiliation(s)
- Zahra Achiou
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| | - Hechmi Toumi
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| | - Jérome Touvier
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| | - Arnaud Boudenot
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| | - Rustem Uzbekov
- Department of Microscopy, University of François Rabelais, Tours, France.
| | - Michael S Ominsky
- Metabolic Disorders, Amgen Inc., One Amgen Center Dr., Thousand Oaks 91320, CA, USA.
| | - Stéphane Pallu
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| | - Eric Lespessailles
- EA4708 I3MTO, Orleans Regional Hospital, University of Orleans, Orleans, France.
| |
Collapse
|
111
|
Frenkel B, White W, Tuckermann J. Glucocorticoid-Induced Osteoporosis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015. [PMID: 26215995 DOI: 10.1007/978-1-4939-2895-8_8] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Osteoporosis is among the most devastating side effects of glucocorticoid (GC) therapy for the management of inflammatory and auto-immune diseases. Evidence from both humans and mice indicate deleterious skeletal effects within weeks of pharmacological GC administration, both related and unrelated to a decrease in bone mineral density (BMD). Osteoclast numbers and bone resorption are also rapidly increased, and together with osteoblast inactivation and decreased bone formation, these changes lead the fastest loss in BMD during the initial disease phase. Bone resorption then decreases to sub-physiological levels, but persistent and severe inhibition of bone formation leads to further bone loss and progressively increased fracture risk, up to an order of magnitude higher than that observed in untreated individuals. Bone forming osteoblasts are thus considered the main culprits in GC-induced osteoporosis (GIO). Accordingly, we focus this review primarily on deleterious effects on osteoblasts: inhibition of cell replication and function and acceleration of apoptosis. Mediating these adverse effects, GCs target pivotal regulatory mechanisms that govern osteoblast growth, differentiation and survival. Specifically, GCs inhibit growth factor pathways, including Insulin Growth Factors, Growth Hormone, Hepatocyte Growth/Scatter Factor and IL6-type cytokines. They also inhibit downstream kinases, including PI3-kinase and the MAP kinase ERK, the latter attributable in part to direct transcriptional stimulation of MAP kinase phosphatase 1. Most importantly, however, GCs inhibit the Wnt signaling pathway, which plays a pivotal role in osteoblast replication, function and survival. They transcriptionally stimulate expression of Wnt inhibitors of both the Dkk and Sfrp families, and they induce reactive oxygen species (ROS), which result in loss of ß-catenin to ROS-activated FoxO transcription factors. Identification of dissociated GCs, which would suppress the immune system without causing osteoporosis, is proving more challenging than initially thought, and GIO is currently managed by co-treatment with bisphosphonates or PTH. These drugs, however, are not ideally suited for GIO. Future therapeutic approaches may aim at GC targets such as those mentioned above, or newly identified targets including the Notch pathway, the AP-1/Il11 axis and the osteoblast master regulator RUNX2.
Collapse
Affiliation(s)
- Baruch Frenkel
- Department of Orthopaedic Surgery, Keck School of Medicine, Institute for Genetic Medicine, University of Southern California, 2250 Alcazar Street, CSC-240, Los Angeles, CA, 90033, USA,
| | | | | |
Collapse
|
112
|
Ren H, Liang D, Jiang X, Tang J, Cui J, Wei Q, Zhang S, Yao Z, Shen G, Lin S. Variance of spinal osteoporosis induced by dexamethasone and methylprednisolone and its associated mechanism. Steroids 2015. [PMID: 26216207 DOI: 10.1016/j.steroids.2015.07.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Glucocorticoid (GC) administration is the most common cause of secondary osteoporosis. Previous studies investigated GCs dose and frequency correlated positively with the side effects of glucocorticoid on bone health, however the impaired effect of various types of GCs on bone has not yet been reported. PURPOSE The aim is to compare the effect of long-acting (dexamethasone) and relatively short-acting glucocorticoid (methylprednisolone) on rat lumbar spine and try to explore the associated mechanism. METHOD Sprague Dawley rats (N=48) were randomly divided into four groups: baseline group (BL), control group (CON), methylprednisolone group (MP) and dexamethasone group (DEXA). BL rats were euthanized to remain as baseline (M0) at the beginning of experiment. CON group were injected daily with vehicle, while the other groups were given a daily subcutaneous injection of 1mg/kg methylprednisolone and were given a subcutaneous injection of 0.6mg/kg dexamethasone per 3days, respectively. CON, MP and DEXA groups were monitored at 4th week (M1), 8th week (M2) and 12th week (M3) after intervention. Dual-energy X-ray, micro-computed tomography, compressive test, enzyme-linked immunosorbent assay have been used for bone mineral density, microarchitecture, biomechanical property of vertebrae and levels of estrogen, PINP and β-CTX, respectively. mRNA expression analysis of Biglycan, Col1a1, MMP9, Cathepsin K, Runx2, OPG, LRP5, Sclerostin were performed. RESULT We found that the bone mineral density (BMD) was significantly lower in DEXA rats at M3 compared with MP rats. The relative surface and trabecular number were significantly lower in DEXA group than that in MP group at M2, while trabecular separation was significantly higher in DEXA group than that in MP group at the same point. The compressive strength was significantly lower in L4 of DEXA than that in MP rats at M2 and M3. The levels of both PINP and estradiol in DEXA group were lower than MP group at M3, even though without statistical significance. The expression of bone formation marker Runx2 was significantly down-regulated at M3 in DEXA group compared with MP, CON and BL groups, while the expression of Col1a1 was significantly up-regulated and biglycan, LRP-5, OPG were significantly down-regulated in GCs intervention groups compared with CON and BL groups. There were no statistical differences in MMP9, Cathepsin K, Sclerostin among CON, MP and DEXA groups. CONCLUSION These results indicate that dexamethasone, the long-acting glucocorticoid, generates more serious osteoporosis of rat lumbar spine than methylprednisolone, which is relatively short-acting glucocorticoid. The discrepancy between the two GCs inducing osteoporosis may be mainly caused by a decrease in bone formation. RUNX2 and Col1a1 may be the two of critical genes inducing the discrepant impairment.
Collapse
Affiliation(s)
- Hui Ren
- The First School of Clinic Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China.
| | - De Liang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, China; Laboratory Affiliated to National Key Discipline of Orthopaedic and Traumatology of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China.
| | - Xiaobing Jiang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, China; Laboratory Affiliated to National Key Discipline of Orthopaedic and Traumatology of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China.
| | - Jingjing Tang
- The First School of Clinic Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Jianchao Cui
- The First School of Clinic Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Qiushi Wei
- Laboratory Affiliated to National Key Discipline of Orthopaedic and Traumatology of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China; Postdoctoral Programme, General Hospital of Guangzhou Military Command of Chinese PLA, Guangzhou 510010, China
| | - Shuncong Zhang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Zhensong Yao
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Gengyang Shen
- The First School of Clinic Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Shunxin Lin
- The First School of Clinic Medicine, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| |
Collapse
|
113
|
Iijima H, Aoyama T, Ito A, Yamaguchi S, Nagai M, Tajino J, Zhang X, Kuroki H. Effects of short-term gentle treadmill walking on subchondral bone in a rat model of instability-induced osteoarthritis. Osteoarthritis Cartilage 2015; 23:1563-74. [PMID: 25916553 DOI: 10.1016/j.joca.2015.04.015] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 04/04/2015] [Accepted: 04/15/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Subchondral bone cyst (SBC) growth, caused by osteoclast activity during early knee osteoarthritis (OA) pathogenesis, should be treated to prevent further progressions of OA. In the present study, we evaluated the effects of gentle treadmill walking on subchondral bone and cartilage changes in an experimental rat model of destabilized medial meniscus (DMM). METHOD Twelve-week-old Wistar rats underwent DMM surgery in their right knee and sham surgery in their left knee and were assigned to either the sedentary group or walking group (n = 42/group). Animals in the walking group were subjected to treadmill exercise 2 days after surgery, which included walking for 12 m/min, 30 min/day, 5 days/week for 1, 2, and 4 week(s). Subchondral bone and cartilage changes were evaluated by micro-CT analysis, histological analysis, and biomechanical analysis. RESULTS Treadmill walking had a tendency to suppress SBC growth, which was confirmed by micro-CT (P = 0.06) and positive staining for tartrate-resistant acid phosphatase (TRAP) activity for the osteoclast number per bone surface (P = 0.09) 4 weeks after surgery. These changes coincide with the prevention of cartilage degeneration as evaluated by the Osteoarthritis Research Society International (OARSI) score (P < 0.05) and biomechanically softening (P < 0.05). Furthermore, treadmill walking could suppressed increasing osteocyte deaths (P < 0.01), which was positively correlated with the OARSI score (r = 0.77; P < 0.01). CONCLUSION These results indicate biomechanical and biological links exist between cartilage and subchondral bone; preventive effects of treadmill walking on subchondral bone deterioration might be partly explained by the chondroprotective effects.
Collapse
Affiliation(s)
- H Iijima
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - T Aoyama
- Department of Development and Rehabilitation of Motor Function, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - A Ito
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - S Yamaguchi
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - M Nagai
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - J Tajino
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - X Zhang
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| | - H Kuroki
- Department of Motor Function Analysis, Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
| |
Collapse
|
114
|
Clarke MV, Russell PK, Findlay DM, Sastra S, Anderson PH, Skinner JP, Atkins GJ, Zajac JD, Davey RA. A Role for the Calcitonin Receptor to Limit Bone Loss During Lactation in Female Mice by Inhibiting Osteocytic Osteolysis. Endocrinology 2015; 156:3203-14. [PMID: 26135836 DOI: 10.1210/en.2015-1345] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
During lactation, the large transfer of calcium from the mother to the milk is primarily sourced from the maternal skeleton. To determine whether the calcitonin receptor (CTR) plays a physiological role to protect the skeleton from excessive resorption during lactation, we assessed the maternal skeleton of global CTR knockout (CTRKO) and littermate control mice at the end of lactation (postnatal day 21). Micro-computed tomography analyses showed no effect on trabecular or cortical bone in the distal femur and L1 vertebra of maternal global CTR deletion at the end of lactation in global CTRKO mice compared with that in control mice. Bone resorption, as assessed by osteoclast number and activity at the end of lactation, was unaffected by maternal CTR deletion. Cathepsin K, carbonic anhydrase 2, matrix metalloproteinase 13, and receptor activator of nuclear factor-κB ligand mRNA levels, however, were markedly elevated by 3- to 6.5-fold in whole bone of lactating global CTRKO females. Because these genes have been shown to be up-regulated in osteocytes during lactation when osteocytes resorb their surrounding bone matrix, together with their reported expression of the CTR, we determined the osteocyte lacunar area in cortical bone. After lactation, the top 20% of osteocyte lacunar area in global CTRKO mice was 10% larger than the top 20% in control mice. These data are consistent with an increased osteocytic osteolysis in global CTRKO mice during lactation, which is further supported by the increased serum calcium observed in global CTRKO mice after lactation. These results provide evidence for a physiological role for the CTR to protect the maternal skeleton during lactation by a direct action on osteocytes to inhibit osteolysis.
Collapse
Affiliation(s)
- Michele V Clarke
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Patricia K Russell
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - David M Findlay
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Stephen Sastra
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Paul H Anderson
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Jarrod P Skinner
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Gerald J Atkins
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Jeffrey D Zajac
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| | - Rachel A Davey
- Department of Medicine (M.V.C., P.K.R., S.S., J.P.S., J.D.Z., R.A.D.), Austin Health, University of Melbourne, Heidelberg, 3084 Victoria, Australia; Centre for Orthopaedic and Trauma Research (D.M.F., G.J.A.), University of Adelaide, 5005 Adelaide, Australia; and School of Pharmacy and Medical Sciences (P.H.A.), University of South Australia, 5005 Adelaide, Australia
| |
Collapse
|
115
|
Abstract
BACKGROUND One of the strongest predictors for osteoporosis is peak bone mass. Interventions to augment peak bone mass have yet to be developed. β-Ecdysone (βEcd), a natural steroid-like compound produced by arthropods to initiate metamorphosis, is believed to have androgenic effects and so may be used to augment bone mass. QUESTIONS/PURPOSES The purpose of this study was to use both male and female (1) gonadal-sufficient; and (2) -insufficient mice to investigate sex differences in terms of bone development and structure after βEcd administration. METHODS Two-month-old male and female Swiss-Webster mice were randomized to receive either vehicle or βEcd (0.5 mg/kg) for 3 weeks. In a separate experiment to evaluate the effects of βEcd on sex hormone-deficient mice, gonadectomy was performed in male (orchiectomy [ORX]) and female mice (ovariectomy [OVX]). Sham-operated and the ORX/OVX mice were then treated for 3 weeks with βEcd. Primary endpoints for the study were trabecular bone structure and bone strength. RESULTS In male mice, the trabecular bone volume was 0.18±0.02 in the placebo-treated (PL) and 0.23±0.02 in the βEcd-treated group (p<0.05 versus PL); and 0.09±0.01 in the ORX group (p<0.05 versus PL) and 0.12±0.01 in the ORX+βEcd group. Vertebral bone strength (maximum load) was 43±2 in PL and 51±1 in the βEcd-treated group (p<0.05 versus PL); and 30±4 in the ORX group (p<0.05 versus PL) and 37±3 in the ORX+βEcd group. In female mice, trabecular bone volume was 0.23±0.02 in PL and 0.26±0.02 in the βEcd-treated group (p<0.05 versus PL); and 0.15±0.01 in the OVX group (p<0.05 versus PL) and 0.14±0.01 in the OVX+βEcd group. Maximum load of the vertebrae was 45±2 in PL and 48±4 in the βEcd-treated group; and 39±4 in the OVX group (p<0.05 versus PL) and 44±4 in the OVX+βEcd group. CONCLUSIONS These findings suggest the potential use of βEcd in the augmentation of bone mass in growing male and female mice. It may also partially prevent the detrimental effects of gonadectomy on trabecular bone. CLINICAL RELEVANCE Our results support the potential use of βEcd or nature products that are rich in βEcd to augment peak bone mass. βEcd may differ from the other anabolic hormone treatments that may have severe side effects such as serious cardiac complications. However, its effects on humans remain to be determined.
Collapse
|
116
|
Kenanidis E, Potoupnis ME, Kakoulidis P, Leonidou A, Sakellariou GT, Sayegh FE, Tsiridis E. Management of glucocorticoid-induced osteoporosis: clinical data in relation to disease demographics, bone mineral density and fracture risk. Expert Opin Drug Saf 2015; 14:1035-53. [PMID: 25952267 DOI: 10.1517/14740338.2015.1040387] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
INTRODUCTION Glucocorticoid-induced osteoporosis (GIOP) is the most common type of secondary osteoporosis. Patient selection and the treatment choice remain to be controversial. None of the proposed management guidelines are widely accepted. We evaluate the available clinical data, the efficacy of current medication and we propose an overall algorithm for managing GIOP. AREAS COVERED This article provides a critical review of in vivo and clinical evidence regarding GIOP and developing evidence-based algorithm of treatment. Data base used includes MEDLINE® (1950 to May 2014). EXPERT OPINION Patient-specific treatment is the gold standard of care. Glucocorticoid (GC)-treated patients must comply with a healthy lifestyle and receive 1000 mg of calcium and at least 800 mg of Vitamin D daily. Bisphosphonate (BP) therapy is the current standard of care for prevention and treatment of GIOP. Most of bisphosphonates demonstrated benefit in lumbar bone mineral density (BMD) and some in hip BMD. Alendronate, risedronate and zoledronate showed vertebral anti-fracture efficacy in postmenopausal women and men. Scarce data however when compared head to head with BP efficacy. In post-menopausal women, early antiresorptive BP treatment appears to be efficient and safe. In premenopausal women and patients at high risk of fracture receiving long-term GC therapy however, teriparitide may be advised alternatively.
Collapse
Affiliation(s)
- Eustathios Kenanidis
- Aristotle University Medical School, Academic Orthopaedic Unit , Thessaloniki , Greece
| | | | | | | | | | | | | |
Collapse
|
117
|
Sano H, Kikuta J, Furuya M, Kondo N, Endo N, Ishii M. Intravital bone imaging by two-photon excitation microscopy to identify osteocytic osteolysis in vivo. Bone 2015; 74:134-9. [PMID: 25624000 DOI: 10.1016/j.bone.2015.01.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 01/13/2015] [Accepted: 01/21/2015] [Indexed: 10/24/2022]
Abstract
Bone is a highly dynamic organ in which several cell types function cooperatively. Among these, osteocytes have recently emerged as an important regulator of bone homeostasis, although their mechanism of regulation is unclear. Here, intravital bone imaging by two-photon excitation microscopy allowed us to directly visualize 'osteocytic osteolysis', or resorption of bone in the lacuno-canalicular system. Osteocyte lacunae and the canalicular network in the cortex of murine tibiae were imaged by in vivo calcein staining, and local acidification in these structures was monitored using a topically applied pH sensor. We also demonstrated that sciatic neurectomy causes significant acidification around osteocytic lacunae and enlargement of lacuno-canalicular areas. These results provide strong evidence for osteocytic osteolysis, and demonstrate that two-photon intravital microscopy is useful for analysis of this phenomenon.
Collapse
Affiliation(s)
- Hiroshige Sano
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan; Department of Orthopedic Surgery, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Junichi Kikuta
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan; WPI-Immunology Frontier Research Center, Osaka University, Osaka, Japan; JST, CREST, Tokyo, Japan
| | - Masayuki Furuya
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan; WPI-Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Naoki Kondo
- Department of Orthopedic Surgery, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Naoto Endo
- Department of Orthopedic Surgery, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan; WPI-Immunology Frontier Research Center, Osaka University, Osaka, Japan; JST, CREST, Tokyo, Japan.
| |
Collapse
|
118
|
Dai W, Jiang L, Lay YAE, Chen H, Jin G, Zhang H, Kot A, Ritchie RO, Lane NE, Yao W. Prevention of glucocorticoid induced bone changes with beta-ecdysone. Bone 2015; 74:48-57. [PMID: 25585248 PMCID: PMC4355031 DOI: 10.1016/j.bone.2015.01.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/15/2014] [Accepted: 01/05/2015] [Indexed: 12/20/2022]
Abstract
Beta-ecdysone (βEcd) is a phytoecdysteroid found in the dry roots and seeds of the asteraceae and achyranthes plants, and is reported to increase osteogenesis in vitro. Since glucocorticoid (GC) excess is associated with a decrease in bone formation, the purpose of this study was to determine if treatment with βEcd could prevent GC-induced osteoporosis. Two-month-old male Swiss-Webster mice (n=8-10/group) were randomized to either placebo or slow release prednisolone pellets (3.3mg/kg/day) and treated with vehicle control or βEcd (0.5mg/kg/day) for 21days. GC treatment inhibited age-dependent trabecular gain and cortical bone expansion and this was accompanied by a 30-50% lower bone formation rate (BFR) at both the endosteal and periosteal surfaces. Mice treated with only βEcd significantly increased bone formation on the endosteal and periosteal bone surfaces, and increased cortical bone mass were their controls to compare to GC alone. Concurrent treatment of βEcd and GC completely prevented the GC-induced reduction in BFR, trabecular bone volume and partially prevented cortical bone loss. In vitro studies determined that βEcd prevented the GC increase in autophagy of the bone marrow stromal cells as well as in whole bone. In summary, βEcd prevented GC induced changes in bone formation, bone cell viability and bone mass. Additional studies are warranted of βEcd for the treatment of GC induced bone loss.
Collapse
Affiliation(s)
- Weiwei Dai
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA; Department of Science and Technology, Longhua Hospital Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Li Jiang
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Yu-An Evan Lay
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Haiyan Chen
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Guoqin Jin
- Department of Science and Technology, Longhua Hospital Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Hongliang Zhang
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Alexander Kot
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Robert O Ritchie
- Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Nancy E Lane
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA
| | - Wei Yao
- Center for Musculoskeletal Health, Internal Medicine, University of California at Davis Medical Center, Sacramento, CA 95817, USA.
| |
Collapse
|
119
|
Briot K, Roux C. Glucocorticoid-induced osteoporosis. RMD Open 2015; 1:e000014. [PMID: 26509049 PMCID: PMC4613168 DOI: 10.1136/rmdopen-2014-000014] [Citation(s) in RCA: 177] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 03/16/2015] [Accepted: 03/17/2015] [Indexed: 12/27/2022] Open
Abstract
Corticosteroid-induced osteoporosis is the most common form of secondary osteoporosis and the first cause in young people. Bone loss and increased rate of fractures occur early after the initiation of corticosteroid therapy, and are then related to dosage and treatment duration. The increase in fracture risk is not fully assessed by bone mineral density measurements, as it is also related to alteration of bone quality and increased risk of falls. In patients with rheumatoid arthritis, a treat-to-target strategy focusing on low disease activity including through the use of low dose of prednisone, is a key determinant of bone loss prevention. Bone loss magnitude is variable and there is no clearly identified predictor of the individual risk of fracture. Prevention or treatment of osteoporosis should be considered in all patients who receive prednisone. Bisphosphonates and the anabolic agent parathyroid hormone (1-34) have shown their efficacy in the treatment of corticosteroid-induced osteoporosis. Recent international guidelines are available and should guide management of corticosteroid-induced osteoporosis, which remains under-diagnosed and under-treated. Duration of antiosteoporotic treatment should be discussed at the individual level, depending on the subject's characteristics and on the underlying inflammation evolution.
Collapse
Affiliation(s)
- Karine Briot
- Department of Rheumatology , Research Center, Epidemiology and Biostatistics Sorbonne Paris Cité, Cochin Hospital, INSERM U1153, Paris Descartes University , Paris , France
| | - Christian Roux
- Department of Rheumatology , Research Center, Epidemiology and Biostatistics Sorbonne Paris Cité, Cochin Hospital, INSERM U1153, Paris Descartes University , Paris , France
| |
Collapse
|
120
|
Milovanovic P, Zimmermann EA, Riedel C, vom Scheidt A, Herzog L, Krause M, Djonic D, Djuric M, Püschel K, Amling M, Ritchie RO, Busse B. Multi-level characterization of human femoral cortices and their underlying osteocyte network reveal trends in quality of young, aged, osteoporotic and antiresorptive-treated bone. Biomaterials 2015; 45:46-55. [PMID: 25662494 DOI: 10.1016/j.biomaterials.2014.12.024] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 12/11/2014] [Accepted: 12/20/2014] [Indexed: 01/04/2023]
Abstract
Characterization of bone's hierarchical structure in aging, disease and treatment conditions is imperative to understand the architectural and compositional modifications to the material and its mechanical integrity. Here, cortical bone sections from 30 female proximal femurs - a frequent fracture site - were rigorously assessed to characterize the osteocyte lacunar network, osteon density and patterns of bone matrix mineralization by backscatter-electron imaging and Fourier-transform infrared spectroscopy in relation to mechanical properties obtained by reference-point indentation. We show that young, healthy bone revealed the highest resistance to mechanical loading (indentation) along with higher mineralization and preserved osteocyte-lacunar characteristics. In contrast, aging and osteoporosis significantly alter bone material properties, where impairment of the osteocyte-lacunar network was evident through accumulation of hypermineralized osteocyte lacunae with aging and even more in osteoporosis, highlighting increased osteocyte apoptosis and reduced mechanical competence. But antiresorptive treatment led to fewer mineralized lacunae and fewer but larger osteons signifying rejuvenated bone. In summary, multiple structural and compositional changes to the bone material were identified leading to decay or maintenance of bone quality in disease, health and treatment conditions. Clearly, antiresorptive treatment reflected favorable effects on the multifunctional osteocytic cells that are a prerequisite for bone's structural, metabolic and mechanosensory integrity.
Collapse
Affiliation(s)
- Petar Milovanovic
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany; Laboratory for Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr Subotica 4/2, 11000 Belgrade, Serbia
| | - Elizabeth A Zimmermann
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Christoph Riedel
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Annika vom Scheidt
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Lydia Herzog
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Matthias Krause
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Danijela Djonic
- Laboratory for Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr Subotica 4/2, 11000 Belgrade, Serbia
| | - Marija Djuric
- Laboratory for Anthropology, Institute of Anatomy, Faculty of Medicine, University of Belgrade, Dr Subotica 4/2, 11000 Belgrade, Serbia
| | - Klaus Püschel
- Department of Forensic Medicine, University Medical Center Hamburg-Eppendorf, Butenfeld 34, 22529 Hamburg, Germany
| | - Michael Amling
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany
| | - Robert O Ritchie
- Department of Materials Science and Engineering, University of California, Berkeley, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA
| | - Björn Busse
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Lottestrasse 59, 22529 Hamburg, Germany; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA.
| |
Collapse
|
121
|
Mandair GS, Morris MD. Contributions of Raman spectroscopy to the understanding of bone strength. BONEKEY REPORTS 2015; 4:620. [PMID: 25628882 DOI: 10.1038/bonekey.2014.115] [Citation(s) in RCA: 210] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 10/24/2014] [Indexed: 02/07/2023]
Abstract
Raman spectroscopy is increasingly commonly used to understand how changes in bone composition and structure influence tissue-level bone mechanical properties. The spectroscopic technique provides information on bone mineral and matrix collagen components and on the effects of various matrix proteins on bone material properties as well. The Raman spectrum of bone not only contains information on bone mineral crystallinity that is related to bone hardness but also provides information on the orientation of mineral crystallites with respect to the collagen fibril axis. Indirect information on collagen cross-links is also available and will be discussed. After a short introduction to bone Raman spectroscopic parameters and collection methodologies, advances in in vivo Raman spectroscopic measurements for animal and human subject studies will be reviewed. A discussion on the effects of aging, osteogenesis imperfecta, osteoporosis and therapeutic agents on bone composition and mechanical properties will be highlighted, including genetic mouse models in which structure-function and exercise effects are explored. Similarly, extracellular matrix proteins, proteases and transcriptional proteins implicated in the regulation of bone material properties will be reviewed.
Collapse
Affiliation(s)
- Gurjit S Mandair
- Department of Chemistry, University of Michigan , Ann Arbor, MI, USA
| | - Michael D Morris
- Department of Chemistry, University of Michigan , Ann Arbor, MI, USA
| |
Collapse
|
122
|
|
123
|
Toscani D, Bolzoni M, Accardi F, Aversa F, Giuliani N. The osteoblastic niche in the context of multiple myeloma. Ann N Y Acad Sci 2014; 1335:45-62. [DOI: 10.1111/nyas.12578] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Denise Toscani
- Myeloma Unit, Department of Clinical and Experimental Medicine; University of Parma; Parma Italy
| | - Marina Bolzoni
- Myeloma Unit, Department of Clinical and Experimental Medicine; University of Parma; Parma Italy
| | - Fabrizio Accardi
- Myeloma Unit, Department of Clinical and Experimental Medicine; University of Parma; Parma Italy
| | - Franco Aversa
- Myeloma Unit, Department of Clinical and Experimental Medicine; University of Parma; Parma Italy
| | - Nicola Giuliani
- Myeloma Unit, Department of Clinical and Experimental Medicine; University of Parma; Parma Italy
| |
Collapse
|
124
|
Feng M, Zhang R, Gong F, Yang P, Fan L, Ni J, Bi W, Zhang Y, Wang C, Wang K. Protective effects of necrostatin-1 on glucocorticoid-induced osteoporosis in rats. J Steroid Biochem Mol Biol 2014; 144 Pt B:455-62. [PMID: 25220755 DOI: 10.1016/j.jsbmb.2014.09.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 09/02/2014] [Accepted: 09/04/2014] [Indexed: 12/26/2022]
Abstract
The inhibition of bone formation has been suggested to play a central role in the pathogenesis of glucocorticoid-induced osteoporosis (GIOP). Recently, many studies suggested that there may be another mechanism involved in GIOP besides apoptosis. The aim of this study was to investigate the protective effect of Necrostatin-1 on GIOP rats. Forty male Sprague-Dawley rats were randomly divided into four groups (n=10): controls; GIOP rats; GIOP rats pretreated with alendronate; and GIOP rats pretreated with Necrostatin-1. Their bone mineral density (BMD) and body weight were measured at the beginning and at the end of the experiment. TUNEL assay, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to observe the change of cellular morphology induced by Nec-1. The biochemical analysis and histomorphometric analysis were used to evaluate the change of bone formation by Nec-1. RIP-1, RIP-3 and caspase-8 expression were evaluated by immunohistochemistry. We found more TUNEL positive osteocytes and larger lacunae volume in GIOP rats compared with the control group. However, most of the osteocytes displayed a necrotic morphology and mitochondria lesions under TEM. In contrast to alendronate, Necrostatin-1 significantly elevated the level of bone formation markers, while it had no effect on bone resorption markers. Necrostatin-1 also markedly ameliorated trabecular bone. In addition, Necrostatin-1 significantly weaken the immunoreactivity of RIP-1 in GIOP rats while had no effect on RIP-3 and caspase-8. These data suggest, for the first time, that Necrostatin-1 accelerate bone formation of glucocorticoid-induced osteoporosis in rats.
Collapse
Affiliation(s)
- Min Feng
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - RuiRui Zhang
- Department of ICU, 521 Healthy Institutes of North Industries, No. 12 Zhangbadong Road, Xi'an, Shaanxi Province, PR China
| | - Futai Gong
- Department of Orthopaedics, Chinese Medicine Hospital of Xi'an, No. 325 Dongda Street, Xi'an, Shaanxi Province, PR China
| | - Pei Yang
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - Lihong Fan
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - Jianlong Ni
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - Wenchao Bi
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - Yongtao Zhang
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - ChunSheng Wang
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China
| | - KunZheng Wang
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University No.157 Xiwu Road, Xi'an, Shaanxi Province, PR China.
| |
Collapse
|
125
|
Lin S, Huang J, Zheng L, Liu Y, Liu G, Li N, Wang K, Zou L, Wu T, Qin L, Cui L, Li G. Glucocorticoid-induced osteoporosis in growing rats. Calcif Tissue Int 2014; 95:362-73. [PMID: 25086673 DOI: 10.1007/s00223-014-9899-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 07/17/2014] [Indexed: 01/16/2023]
Abstract
This study evaluated whether growing rats were appropriate animal models of glucocorticoid-induced osteoporosis. The 3-month-old male rats were treated with either vehicle or prednisone acetate at 1.5, 3.0, and 6.0 mg/kg/day by oral gavage, respectively. All rats were injected with tetracycline and calcein before sacrificed for the purpose of double in vivo labeling. Biochemistry, histomorphometry, mechanical test, densitometry, micro-CT, histology, and component analysis were performed. We found that prednisone treatments dose dependently decreased body weight, serum biomarkers, biomechanical markers, bone formation, and bone resorption parameters in both tibial and femoral trabecular bone without trabecular bone loss. We also found that significant bone loss happened in femoral cortical bone in the glucocorticoid-treated rats. The results suggested that prednisone not only inhibited bone formation, but also inhibited bone resorption which resulted in poor bone strength but with no cancellous bone loss in growing rats. These data also suggested that the effects of glucocorticoid on bone metabolism were different between cortical bone and trabecular bone, and different between tibia and femur. Growing rats may be a glucocorticoid-induced osteoporosis animal model when evaluated the effects of drugs upon juvenile patients exposed to GC for a long time.
Collapse
Affiliation(s)
- Sien Lin
- Department of Pharmacology, Guangdong Key Laboratory for Research and Development of Natural Drugs, Guangdong Medical College, Zhanjiang, Guangdong, 524023, China
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
126
|
Abstract
The ability of bone to resist fracture is determined by the combination of bone mass and bone quality. Like bone mass, bone quality is carefully regulated. Of the many aspects of bone quality, this review focuses on biological mechanisms that control the material quality of the bone extracellular matrix (ECM). Bone ECM quality depends upon ECM composition and organization. Proteins and signaling pathways that affect the mineral or organic constituents of bone ECM impact bone ECM material properties, such as elastic modulus and hardness. These properties are also sensitive to pathways that regulate bone remodeling by osteoblasts, osteoclasts, and osteocytes. Several extracellular proteins, signaling pathways, intracellular effectors, and transcription regulatory networks have been implicated in the control of bone ECM quality. A molecular understanding of these mechanisms will elucidate the biological control of bone quality and suggest new targets for the development of therapies to prevent bone fragility.
Collapse
Affiliation(s)
- Tamara Alliston
- Department of Orthopaedic Surgery, University of California San Francisco, 513 Parnassus Avenue, Room S-1155, San Francisco, CA, 94143-0514, USA,
| |
Collapse
|
127
|
Abstract
The functional demand imposed on bone promotes changes in the spatial properties of
osteocytes as well as in their extensions uniformly distributed throughout the
mineralized surface. Once spatial deformation is established, osteocytes create the
need for structural adaptations that result in bone formation and resorption that
happen to meet the functional demands. The endosteum and the periosteum are the
effectors responsible for stimulating adaptive osteocytes in the inner and outer
surfaces.Changes in shape, volume and position of the jaws as a result of skeletal
correction of the maxilla and mandible require anchorage to allow bone remodeling to
redefine morphology, esthetics and function as a result of spatial deformation
conducted by orthodontic appliances. Examining the degree of changes in shape, volume
and structural relationship of areas where mini-implants and miniplates are placed
allows us to classify mini-implants as devices of subabsolute anchorage and
miniplates as devices of absolute anchorage.
Collapse
|
128
|
Boudenot A, Presle N, Uzbekov R, Toumi H, Pallu S, Lespessailles E. Effect of interval-training exercise on subchondral bone in a chemically-induced osteoarthritis model. Osteoarthritis Cartilage 2014; 22:1176-85. [PMID: 24928318 DOI: 10.1016/j.joca.2014.05.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 05/20/2014] [Accepted: 05/28/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVES The role of subchondral bone in osteoarthritis (OA) development is well admitted. Cross-talk between subchondral bone and cartilage may be disrupted in OA, leading to altered subchondral bone remodeling. Osteocytes are involved in bone remodeling control and could play a key role in OA progression. Our purpose of this study was to evaluate the preventive effect of interval-training exercise on subchondral bone and osteocyte in monosodium iodoacetate (MIA) model of experimental OA. METHODS At baseline, 48 male Wistar rats (8 weeks old) were separated into two groups: interval-training exercise or no exercise for 10 weeks. After this training period, each group was divided into two subgroups: MIA-injected knee (1 mg/100 μl saline) and saline-injected knee. Four weeks later, rats were sacrificed and carefully dissected. Evaluated parameters were: cartilage degeneration by OA scoring, bone mineral density (BMD) by Dual energy X-ray Absorptiometry (DXA), trabecular subchondral bone microarchitecture by micro-computed tomography (μCT), cortical subchondral bone lacunar osteocyte occupancy (by Toluidine Blue staining) and cleaved caspase-3 positive apoptosis (by epifluorescence). RESULTS Our results showed deleterious effects of MIA on cartilage. OA induced a decrease in proximal tibia (PT) BMD which was prevented by exercise. Exercise induced increase in full osteocyte lacunae surface and osteocyte occupancy (+60%) of cortical subchondral bone independently of OA. Osteocyte apoptosis (<1%) in cortical subchondral bone was not different whatever the group at sacrifice. CONCLUSION Our results suggest that preliminary interval-training improved BMD and osteocytes lacunar occupancy in subchondral bone. Our interval-training did not prevent MIA-induced cartilage degeneration.
Collapse
Affiliation(s)
- A Boudenot
- EA 4708 I3MTO, University of Orléans, Orléans, France.
| | - N Presle
- UMR 7365 CNRS, Universite de Lorraine, Vandoeuvre-les-Nancy, France
| | - R Uzbekov
- Department of Microscopy, University of Francois Rabelais, Tours, France
| | - H Toumi
- EA 4708 I3MTO, University of Orléans, Orléans, France
| | - S Pallu
- EA 4708 I3MTO, University of Orléans, Orléans, France
| | - E Lespessailles
- EA 4708 I3MTO, University of Orléans, Orléans, France; Service de rhumatologie, Centre hospitalier régional d'Orléans, Orléans, France
| |
Collapse
|
129
|
HESSE BERNHARD, MÄNNICKE NILS, PACUREANU ALEXANDRA, VARGA PETER, LANGER MAX, MAURER PETER, PEYRIN FRANCOISE, RAUM KAY. Accessing osteocyte lacunar geometrical properties in human jaw bone on the submicron length scale using synchrotron radiation μCT. J Microsc 2014; 255:158-68. [DOI: 10.1111/jmi.12147] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 05/14/2014] [Indexed: 11/28/2022]
Affiliation(s)
- BERNHARD HESSE
- Berlin-Brandenburg School for Regenerative Therapies and Julius Wolff Institut; Charité-Universitätsmedizin Berlin; Berlin Germany
- European Synchrotron Radiation Facility; Grenoble France
| | - NILS MÄNNICKE
- Berlin-Brandenburg School for Regenerative Therapies and Julius Wolff Institut; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - ALEXANDRA PACUREANU
- European Synchrotron Radiation Facility; Grenoble France
- Université de Lyon, CREATIS; CNRS UMR 5220; Inserm U1044; INSA-Lyon; Université Lyon 1; Lyon France
- Centre for Image Analysis and Science for Life Laboratory; Uppsala University; Uppsala Sweden
| | - PETER VARGA
- Berlin-Brandenburg School for Regenerative Therapies and Julius Wolff Institut; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - MAX LANGER
- European Synchrotron Radiation Facility; Grenoble France
- Centre for Image Analysis and Science for Life Laboratory; Uppsala University; Uppsala Sweden
| | - PETER MAURER
- Klinik für Mund-, Kiefer- und Gesichtschirurgie; Klinikum Bremerhaven-Reinkenheide; Bremerhaven; Germany
| | - FRANCOISE PEYRIN
- European Synchrotron Radiation Facility; Grenoble France
- Université de Lyon, CREATIS; CNRS UMR 5220; Inserm U1044; INSA-Lyon; Université Lyon 1; Lyon France
| | - KAY RAUM
- Berlin-Brandenburg School for Regenerative Therapies and Julius Wolff Institut; Charité-Universitätsmedizin Berlin; Berlin Germany
| |
Collapse
|
130
|
Instructions for producing a mouse model of glucocorticoid-induced osteoporosis. BONEKEY REPORTS 2014; 3:552. [PMID: 25120909 DOI: 10.1038/bonekey.2014.47] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 05/09/2014] [Indexed: 11/08/2022]
Abstract
Glucocorticoids are effective drugs used for the treatment of inflammatory diseases such as rheumatoid arthritis or asthma. Furthermore, they regulate various physiological processes, including bone remodeling. However, long-term high- and even low-dose glucocorticoid use is associated with a compromised bone quality and an increased fracture risk. At the cellular level, glucocorticoids suppress bone formation and stimulate bone resorption, which leads to loss of bone mass. To investigate the underlying mechanisms and new therapeutic strategies, the in vivo model for glucocorticoid-induced bone loss is widely used. This protocol outlines the common procedure that is currently used for the induction of bone loss in mice using glucocorticoids. It further provides useful hints and highlights possible pitfalls to take into account before starting an experiment.
Collapse
|
131
|
Donnelly E, Lane JM, Boskey AL. Research perspectives: The 2013 AAOS/ORS research symposium on Bone Quality and Fracture Prevention. J Orthop Res 2014; 32:855-64. [PMID: 24700449 PMCID: PMC4716655 DOI: 10.1002/jor.22626] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 03/05/2014] [Indexed: 02/04/2023]
Abstract
Bone fracture resistance is determined by the amount of bone present ("bone quantity") and by a number of other geometric and material factors grouped under the term "bone quality." In May 2013, a workshop was convened among a group of clinicians and basic science investigators to review the current state of the art in Bone Quality and Fracture Prevention and to make recommendations for future directions for research. The AAOS/ORS/OREF workshop was attended by 64 participants, including two representatives of the National Institutes of Arthritis and Musculoskeletal and Skin Diseases and 13 new investigators whose posters stimulated additional interest. A key outcome of the workshop was a set of recommendations regarding clinically relevant aspects of both bone quality and quantity that clinicians can use to inform decisions about patient care and management. The common theme of these recommendations was the need for more education of clinicians in areas of bone quality and for basic science studies to address specific topics of pathophysiology, diagnosis, prevention, and treatment of altered bone quality. In this report, the organizers with the assistance of the speakers and other attendees highlight the major findings of the meeting that justify the recommendations and needs for this field.
Collapse
Affiliation(s)
- Eve Donnelly
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York,Hospital for Special Surgery, New York, New York
| | | | | |
Collapse
|
132
|
Roschger A, Gamsjaeger S, Hofstetter B, Masic A, Blouin S, Messmer P, Berzlanovich A, Paschalis EP, Roschger P, Klaushofer K, Fratzl P. Relationship between the v₂PO₄/amide III ratio assessed by Raman spectroscopy and the calcium content measured by quantitative backscattered electron microscopy in healthy human osteonal bone. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:065002. [PMID: 24919447 DOI: 10.1117/1.jbo.19.6.065002] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 05/14/2014] [Indexed: 06/03/2023]
Abstract
Raman microspectroscopy and quantitative backscattered electron imaging (qBEI) of bone are powerful tools to investigate bone material properties. Both methods provide information on the degree of bone matrix mineralization. However, a head-to-head comparison of these outcomes from identical bone areas has not been performed to date. In femoral midshaft cross sections of three women, 99 regions (20×20 μm²) were selected inside osteons and interstitial bone covering a wide range of matrix mineralization. As the focus of this study was only on regions undergoing secondary mineralization, zones exhibiting a distinct gradient in mineral content close to the mineralization front were excluded. The same regions were measured by both methods. We found a linear correlation (R²=0.75) between mineral/matrix as measured by Raman spectroscopy and the wt. %Mineral/(100-wt. %Mineral) as obtained by qBEI, in good agreement with theoretical estimations. The observed deviations of single values from the linear regression line were determined to reflect biological heterogeneities. The data of this study demonstrate the good correspondence between Raman and qBEI outcomes in describing tissue mineralization. The obtained correlation is likely sensitive to changes in bone tissue composition, providing an approach to detect potential deviations from normal bone.
Collapse
Affiliation(s)
- Andreas Roschger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, AustriabMax Planck Institute of Colloids and Interfaces, 14424 Pot
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Birgit Hofstetter
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Admir Masic
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - Stéphane Blouin
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Phaedra Messmer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Andrea Berzlanovich
- Medical University of Vienna, Department of Forensic Medicine, A-1090 Vienna, Austria
| | - Eleftherios P Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Paul Roschger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Straße 30, A-1140 Vienna, Austria
| | - Peter Fratzl
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| |
Collapse
|
133
|
Mabilleau G, Mieczkowska A, Irwin N, Simon Y, Audran M, Flatt PR, Chappard D. Beneficial effects of a N-terminally modified GIP agonist on tissue-level bone material properties. Bone 2014; 63:61-8. [PMID: 24594344 DOI: 10.1016/j.bone.2014.02.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Revised: 02/19/2014] [Accepted: 02/21/2014] [Indexed: 12/15/2022]
Abstract
Bone remodeling is under complex regulation from nervous, hormonal and local signals, including gut hormones. Among the gut hormones, a role for the glucose-dependent insulinotropic polypeptide (GIP) has been suggested. However, the rapid degradation of GIP in the bloodstream by the ubiquitous enzyme dipeptidyl peptidase-4 (DPP-4) precludes therapeutic use. To circumvent this problem, a series of N-terminally modified GIP agonists have been developed, with N-AcGIP being the most promising. The aims of the present study were to investigate the effects of N-AcGIP on bone at the micro-level using trabecular and cortical microstructural morphology, and at the tissue-level in rats. Copenhagen rats were randomly assigned into control or N-AcGIP-treated groups and received daily injection for 4 weeks. Bone microstructural morphology was assessed by microCT and dynamic histomorphometry and tissue-level properties by nanoindentation, qBEI and infra-red microscopy. Four week treatment with N-AcGIP did not alter trabecular or cortical microstructural morphology. In addition, no significant modifications of mechanical response and properties at the tissue-level were observed in trabecular bone. However, significant augmentations in maximum load (12%), hardness (14%), indentation modulus (13%) and dissipated energy (16%) were demonstrated in cortical bone. These beneficial modifications of mechanical properties at the tissue-level were associated with increased mineralization (22%) and collagen maturity (13%) of the bone matrix. Taken together, the results support a beneficial role of GIP, and particularly stable analogs such as N-AcGIP, on tissue material properties of bone.
Collapse
Affiliation(s)
- Guillaume Mabilleau
- LUNAM Université, GEROM-LHEA, Institut de Biologie en Santé, Angers, France; LUNAM Université, SCIAM, Institut de Biologie en Santé, Angers, France.
| | | | - Nigel Irwin
- School of Biomedical Sciences, University of Ulster, Coleraine, U K
| | - Yannick Simon
- LUNAM Université, GEROM-LHEA, Institut de Biologie en Santé, Angers, France; Service de Rhumatologie, CHU d'Angers, Angers, France
| | - Maurice Audran
- LUNAM Université, GEROM-LHEA, Institut de Biologie en Santé, Angers, France; Service de Rhumatologie, CHU d'Angers, Angers, France
| | - Peter R Flatt
- School of Biomedical Sciences, University of Ulster, Coleraine, U K
| | - Daniel Chappard
- LUNAM Université, GEROM-LHEA, Institut de Biologie en Santé, Angers, France; LUNAM Université, SCIAM, Institut de Biologie en Santé, Angers, France
| |
Collapse
|
134
|
Hesse B, Langer M, Varga P, Pacureanu A, Dong P, Schrof S, Männicke N, Suhonen H, Olivier C, Maurer P, Kazakia GJ, Raum K, Peyrin F. Alterations of mass density and 3D osteocyte lacunar properties in bisphosphonate-related osteonecrotic human jaw bone, a synchrotron µCT study. PLoS One 2014; 9:e88481. [PMID: 24586331 PMCID: PMC3931622 DOI: 10.1371/journal.pone.0088481] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 01/08/2014] [Indexed: 11/26/2022] Open
Abstract
Osteonecrosis of the jaw, in association with bisphosphonates (BRONJ) used for treating osteoporosis or cancer, is a severe and most often irreversible side effect whose underlying pathophysiological mechanisms remain largely unknown. Osteocytes are involved in bone remodeling and mineralization where they orchestrate the delicate equilibrium between osteoclast and osteoblast activity and through the active process called osteocytic osteolysis. Here, we hypothesized that (i) changes of the mineralized tissue matrix play a substantial role in the pathogenesis of BRONJ, and (ii) the osteocyte lacunar morphology is altered in BRONJ. Synchrotron µCT with phase contrast is an appropriate tool for assessing both the 3D morphology of the osteocyte lacunae and the bone matrix mass density. Here, we used this technique to investigate the mass density distribution and 3D osteocyte lacunar properties at the sub-micrometer scale in human bone samples from the jaw, femur and tibia. First, we compared healthy human jaw bone to human tibia and femur in order to assess the specific differences and address potential explanations of why the jaw bone is exclusively targeted by the necrosis as a side effect of BP treatment. Second, we investigated the differences between BRONJ and control jaw bone samples to detect potential differences which could aid an improved understanding of the course of BRONJ. We found that the apparent mass density of jaw bone was significantly smaller compared to that of tibia, consistent with a higher bone turnover in the jaw bone. The variance of the lacunar volume distribution was significantly different depending on the anatomical site. The comparison between BRONJ and control jaw specimens revealed no significant increase in mineralization after BP. We found a significant decrease in osteocyte-lacunar density in the BRONJ group compared to the control jaw. Interestingly, the osteocyte-lacunar volume distribution was not altered after BP treatment.
Collapse
Affiliation(s)
- Bernhard Hesse
- European Synchrotron Radiation Facility, Grenoble, France
- Berlin-Brandenburg School for Regenerative Therapies & Julius Wolff Institut, Charité, Universitätsmedizin Berlin, Germany
| | - Max Langer
- European Synchrotron Radiation Facility, Grenoble, France
- Université de Lyon, CREATIS, CNRS UMR5220, INSA-Lyon, Lyon, France
| | - Peter Varga
- Berlin-Brandenburg School for Regenerative Therapies & Julius Wolff Institut, Charité, Universitätsmedizin Berlin, Germany
| | - Alexandra Pacureanu
- European Synchrotron Radiation Facility, Grenoble, France
- Université de Lyon, CREATIS, CNRS UMR5220, INSA-Lyon, Lyon, France
- Centre for Image Analysis and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Pei Dong
- European Synchrotron Radiation Facility, Grenoble, France
- Université de Lyon, CREATIS, CNRS UMR5220, INSA-Lyon, Lyon, France
| | - Susanne Schrof
- Berlin-Brandenburg School for Regenerative Therapies & Julius Wolff Institut, Charité, Universitätsmedizin Berlin, Germany
| | - Nils Männicke
- Berlin-Brandenburg School for Regenerative Therapies & Julius Wolff Institut, Charité, Universitätsmedizin Berlin, Germany
| | - Heikki Suhonen
- European Synchrotron Radiation Facility, Grenoble, France
| | - Cecile Olivier
- European Synchrotron Radiation Facility, Grenoble, France
- Université de Lyon, CREATIS, CNRS UMR5220, INSA-Lyon, Lyon, France
| | - Peter Maurer
- Klinik für Mund-, Kiefer- und Gesichtschirurgie, Klinikum Bremerhaven-Reinkenheide, Kiel, Germany
| | - Galateia J. Kazakia
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Kay Raum
- Berlin-Brandenburg School for Regenerative Therapies & Julius Wolff Institut, Charité, Universitätsmedizin Berlin, Germany
| | - Francoise Peyrin
- European Synchrotron Radiation Facility, Grenoble, France
- Université de Lyon, CREATIS, CNRS UMR5220, INSA-Lyon, Lyon, France
- * E-mail:
| |
Collapse
|
135
|
Scillitani A, Mazziotti G, Di Somma C, Moretti S, Stigliano A, Pivonello R, Giustina A, Colao A. Treatment of skeletal impairment in patients with endogenous hypercortisolism: when and how? Osteoporos Int 2014; 25:441-6. [PMID: 24311114 DOI: 10.1007/s00198-013-2588-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2013] [Accepted: 08/21/2013] [Indexed: 01/29/2023]
Abstract
Guidelines for the management of osteoporosis induced by endogenous hypercortisolism are not available. Both the American College of Rheumatology and the International Osteoporosis Foundation recommend to modulate the treatment of exogenous glucocorticoid-induced osteoporosis (GIO) based on the individual fracture risk profile (calculated by FRAX) and dose of glucocorticoid used, but it is difficult to translate corticosteroid dosages to different degrees of endogenous hypercortisolism, and there are no data on validation of FRAX stratification method in patients with endogenous hypercortisolism. Consequently, it is unclear whether such recommendations may be adapted to patients with endogenous hypercortisolism. Moreover, patients with exogenous GIO take glucocorticoids since suffering a disease that commonly affects bone. On the other hand, the correction of coexistent risk factors, which may contribute to increase the fracture risk in patients exposed to glucocorticoid excess, and the removal of the cause of endogenous hypercortisolism, may lead to the recovery of bone health. Although the correction of hypercortisolism and of possible coexistent risk factors is necessary to favor the normalization of bone turnover with recovery of bone mass; in some patients, the fracture risk could not be normalized and specific anti-osteoporotic drugs should be given. Who, when, and how the patient with endogenous hypercortisolism should be treated with bone-active therapy is discussed.
Collapse
Affiliation(s)
- A Scillitani
- Unit of Endocrinology, "Casa Sollievo della Sofferenza" Hospital, 71013, San Giovanni Rotondo, Italy,
| | | | | | | | | | | | | | | | | |
Collapse
|
136
|
Ciani C, Sharma D, Doty SB, Fritton SP. Ovariectomy enhances mechanical load-induced solute transport around osteocytes in rat cancellous bone. Bone 2014; 59:229-34. [PMID: 24316418 PMCID: PMC4358819 DOI: 10.1016/j.bone.2013.11.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 11/08/2013] [Accepted: 11/26/2013] [Indexed: 01/06/2023]
Abstract
To test if osteoporosis alters mechanical load-induced interstitial fluid flow in bone, this study examined the combined effect of estrogen deficiency and external loading on solute transport around osteocytes. An in vivo tracer, FITC-labeled bovine serum albumin, was injected into anesthetized ovariectomized and control female Sprague-Dawley rats before the right tibia was subjected to a controlled, physiological, non-invasive sinusoidal load to mimic walking. Tracer movement through the lacunar-canalicular system surrounding osteocytes was quantified in cortical and cancellous bone from the proximal tibia using confocal microscopy, with the non-loaded tibia serving as internal control. Overall, the application of mechanical loading increased the percentage of osteocyte lacunae labeled with injected tracer, and ovariectomy further enhanced movement of tracer. An analysis of separate regions demonstrated that ovariectomy enhanced in vivo transport of the injected tracer in the cancellous bone of the tibial epiphysis and metaphysis but not in the cortical bone of the metaphysis. These findings show that bone changes due to reduced estrogen levels alter convectional transport around osteocytes in cancellous bone and demonstrate a functional difference of interstitial fluid flow around osteocytes in estrogen-deficient rats undergoing the same physical activity as controls. The altered interstitial fluid flow around osteocytes is likely related to nanostructural matrix-mineral level differences recently demonstrated at the lacunar-canalicular surface of estrogen-deficient rats, which could affect the transmission of mechanical loads to the osteocyte.
Collapse
Affiliation(s)
- Cesare Ciani
- Department of Biomedical Engineering, City College of New York, New York, NY 10031, USA
| | - Divya Sharma
- Department of Biomedical Engineering, City College of New York, New York, NY 10031, USA
| | - Stephen B Doty
- Research Division, Hospital for Special Surgery, New York, NY 10021, USA
| | - Susannah P Fritton
- Department of Biomedical Engineering, City College of New York, New York, NY 10031, USA.
| |
Collapse
|
137
|
Chee C, Sellahewa L, Pappachan JM. Inhaled corticosteroids and bone health. Open Respir Med J 2014; 8:85-92. [PMID: 25674178 PMCID: PMC4319192 DOI: 10.2174/1874306401408010085] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 10/21/2014] [Accepted: 10/21/2014] [Indexed: 02/08/2023] Open
Abstract
Inhaled corticosteroids (ICS) are the cornerstones in the management of bronchial asthma and some cases of chronic obstructive pulmonary disease. Although ICS are claimed to have low side effect profiles, at high doses they can cause systemic adverse effects including bone diseases such as osteopenia, osteoporosis and osteonecrosis. Corticosteroids have detrimental effects on function and survival of osteoblasts and osteocytes, and with the prolongation of osteoclast survival, induce metabolic bone disease. Glucocorticoid-induced osteoporosis (GIO) can be associated with major complications such as vertebral and neck of femur fractures. The American College of Rheumatology (ACR) published criteria in 2010 for the management of GIO. ACR recommends bisphosphonates along with calcium and vitamin D supplements as the first-line agents for GIO management. ACR recommendations can be applied to manage patients on ICS with a high risk of developing metabolic bone disease. This review outlines the mechanisms and management of ICS-induced bone disease.
Collapse
Affiliation(s)
- Carolyn Chee
- Department of Endocrinology, Nottingham University Hospitals, NG7 2UH, UK
| | - Luckni Sellahewa
- Department of Endocrinology, Royal Derby Hospital, Derby, DE22 3NE, UK
| | - Joseph M Pappachan
- Department of Endocrinology, Walsall Manor Hospital, West Midlands, WS2 9PS, UK
| |
Collapse
|
138
|
Affiliation(s)
- Timothy R Arnett
- Department of Cell and Developmental Biology, University College London, London, UK
| |
Collapse
|
139
|
Abstract
The last decade has seen an exponential increase in our understanding of osteocytes function and biology. These cells, once considered inert by-standers trapped into the mineralized bone, has now risen to be key regulators of skeletal metabolism, mineral homeostasis, and hematopoiesis. As tools and techniques to study osteocytes improved and expanded, it has become evident that there is more to these cells than initially thought. Osteocytes are now recognized not only as the key responders to mechanical forces but also as orchestrators of bone remodeling and mineral homeostasis. These cells are the primary source of several important proteins, such as sclerostin and fibroblast growth factor 23, that are currently target as novel therapies for bone loss (as the case for antisclerostin antibodies) or phosphate disorders. Better understanding of the intricate cellular and molecular mechanisms that govern osteocyte biology will open new avenue of research and ultimately indentify novel therapeutics to treat bone and mineral disorders. This review summarizes novel findings and discusses future avenues of research.
Collapse
Affiliation(s)
- Paola Divieti Pajevic
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| |
Collapse
|
140
|
Yoon HY, Cho YS, Jin Q, Kim HG, Woo ER, Chung YS. Effects of Ethyl Acetate Extract of Poncirus trifoliata Fruit for Glucocorticoid-Induced Osteoporosis. Biomol Ther (Seoul) 2013; 20:89-95. [PMID: 24116280 PMCID: PMC3792207 DOI: 10.4062/biomolther.2012.20.1.089] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 11/02/2011] [Accepted: 11/02/2011] [Indexed: 11/08/2022] Open
Abstract
Poncirus trifoliata fruit (PTF) affects the digestive and cardiovascular systems, and kidney function. The authors studied the effects of ethyl acetate (EtOAc) extract of PTF on the activities of osteoblasts and in an animal model. The main compounds of the EtOAc extract, naringin and poncirin have been confi rmed by HPLC and NMR analysis. Effects of osteoblastic differentiation were mea-sured by alkaline phosphatase (ALP) activity, osteopontin (OPN) protein expression and osteoprotegerin (OPG) mRNA expression in MC3T3-E1 cells. Also, osteoclast differentiation was measured by multinucleated cells (MNCs) formation through tartrate resistance acid phosphatase (TRAP)-positive staining. Bone mineral density (BMD) was measured before and after treatment with EtOAc extract of PTF in prednisolone-induced osteoporotic mice. Dexamethasone (DEX) decreased OPN and OPG expression level in MC3T3-E1 cells and ALP activity was decreased by DEX dose-dependently. EtOAc extract of PTF recovered the levels of ALP activity, and the expression of OPN and OPG in MC3T3-E1 cells treated with DEX. In osteoclast differentiation, multinucleated TRAP-positive cell formation was significantly suppressed by the EtOAc extract of PTF. Total body BMD was restored by EtOAc extract of PTF in prednisolone-induced osteoporotic mice. In conclusion, EtOAc extract of PTF recovered DEX-mediated deteriorations in osteoblastic and osteoclastic functions, and increased BMD in glucocorticoid-induced osteoporosis.
Collapse
Affiliation(s)
- Hyung-Young Yoon
- Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon 443-721
| | | | | | | | | | | |
Collapse
|
141
|
Abstract
Few investigators think of bone as an endocrine gland, even after the discovery that osteocytes produce circulating fibroblast growth factor 23 that targets the kidney and potentially other organs. In fact, until the last few years, osteocytes were perceived by many as passive, metabolically inactive cells. However, exciting recent discoveries have shown that osteocytes encased within mineralized bone matrix are actually multifunctional cells with many key regulatory roles in bone and mineral homeostasis. In addition to serving as endocrine cells and regulators of phosphate homeostasis, these cells control bone remodeling through regulation of both osteoclasts and osteoblasts, are mechanosensory cells that coordinate adaptive responses of the skeleton to mechanical loading, and also serve as a manager of the bone's reservoir of calcium. Osteocytes must survive for decades within the bone matrix, making them one of the longest lived cells in the body. Viability and survival are therefore extremely important to ensure optimal function of the osteocyte network. As we continue to search for new therapeutics, in addition to the osteoclast and the osteoblast, the osteocyte should be considered in new strategies to prevent and treat bone disease.
Collapse
Affiliation(s)
- Sarah L Dallas
- PhD, Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, 650 East 25th Street, Kansas City, Missouri 64108.
| | | | | |
Collapse
|
142
|
Luo TD, Allen MR. Short-courses of dexamethasone abolish bisphosphonate-induced reductions in bone toughness. Bone 2013; 56:199-203. [PMID: 23774445 PMCID: PMC3732470 DOI: 10.1016/j.bone.2013.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 05/31/2013] [Accepted: 06/03/2013] [Indexed: 12/22/2022]
Abstract
Atypical femoral fractures, which display characteristics of brittle material failure, have been associated with potent remodeling suppression drugs. Given the millions of individuals treated with this class of drugs it is likely that other factors play a role in these fractures. Some evidence suggests that concomitant use of corticosteroids may contribute to the pathogenesis although data in this area is lacking. The goal of this study was to assess the combined role of bisphosphonates and dexamethasone on bone mechanical properties. Skeletally mature beagle dogs were either untreated controls, or treated with zoledronic acid (ZOL), dexamethasone (DEX), or ZOL + DEX. Zoledronic acid (0.06 mg/kg) was given monthly via IV infusion for 9 months. DEX (5 mg) was administered daily for one week during each of the last three months of the 9 month experiment. Ribs were harvested and assessed for bone geometry, mechanical properties, and remodeling rate (n = 3-6 specimens per group). DEX significantly suppressed intracortical remodeling compared to vehicle controls while both ZOL and the combination of DEX + ZOL nearly abolished intracortical remodeling. ZOL treatment resulted in significantly lower bone toughness, determined from 3-point bending tests, compared to all other treatment groups while the toughness in ZOL + DEX animals was identical to those of untreated controls. These findings suggest that short-courses of dexamethasone not only do not adversely affect toughness in the setting of bisphosphonates, but also actually reverse the adverse effects of its treatment. Understanding the mechanism for this tissue-level effect could lead to novel approaches for reducing the risk of atypical femoral fractures.
Collapse
Affiliation(s)
- Tianyi D Luo
- Department of Anatomy and Cell Biology, Indiana University School of Medicine Indianapolis, Indianapolis, IN, USA
| | | |
Collapse
|
143
|
Yao W, Dai W, Jiang JX, Lane NE. Glucocorticoids and osteocyte autophagy. Bone 2013; 54:279-84. [PMID: 23356984 PMCID: PMC3784314 DOI: 10.1016/j.bone.2013.01.034] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 01/06/2013] [Accepted: 01/18/2013] [Indexed: 12/17/2022]
Abstract
Glucocorticoids are used for the treatment of inflammatory and autoimmune diseases. While they are effective therapy, bone loss and incident fracture risk are high. While previous studies have found GC effects on both osteoclasts and osteoblasts, our work has focused on the effects of GCs on osteocytes. Osteocytes exposed to low dose GCs undergo autophagy while osteocytes exposed to high doses of GCs or for a prolonged period of time undergo apoptosis.
Collapse
Affiliation(s)
- Wei Yao
- Department of Medicine, University of California at Davis Medical Center Sacramento, CA 95818, USA
| | | | | | | |
Collapse
|
144
|
|
145
|
Bozal CB, Sánchez LM, Mandalunis PM, Ubios ÁM. Histomorphometric study and three-dimensional reconstruction of the osteocyte lacuno-canalicular network one hour after applying tensile and compressive forces. Cells Tissues Organs 2013; 197:474-83. [PMID: 23594460 DOI: 10.1159/000347237] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2013] [Indexed: 11/19/2022] Open
Abstract
The occurrence of very early morphological changes in the osteocyte lacuno-canalicular network following application of tensile and/or compressive forces remains unknown to date. Thus, the aim of this study was to perform a morphological and morphometric evaluation of the changes in the three-dimensional structure of the lacuno-canalicular network and the osteocyte network of alveolar bone that take place very early after applying tensile and compressive forces in vivo, conducting static histomorphometry on bright-field microscopy and confocal laser scanning microscopy images. Our results showed that both the tensile and compressive forces induced early changes in osteocytes and their lacunae, which manifested as an increase in lacunar volume and changes in lacunar shape and orientation. An increase in canalicular width and a decrease in the width and an increase in the length of cytoplasmic processes were also observed. The morphological changes in the lacuno-canalicular and osteocyte networks that occur in vivo very early after application of tensile and compressive forces would be an indication of an increase in permeability within the system. Thus, both compressive and tensile forces would cause fluid displacement very soon after being applied; the latter would in turn rapidly activate alveolar bone osteocytes, enhancing transmission of the signals to the entire osteocyte network and the effector cells located at the bone surface.
Collapse
Affiliation(s)
- Carola B Bozal
- Department of Histology and Embryology, School of Dentistry, University of Buenos Aires, Buenos Aires, Argentina.
| | | | | | | |
Collapse
|
146
|
Brabnikova Maresova K, Pavelka K, Stepan JJ. Acute effects of glucocorticoids on serum markers of osteoclasts, osteoblasts, and osteocytes. Calcif Tissue Int 2013; 92:354-61. [PMID: 23247536 DOI: 10.1007/s00223-012-9684-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 11/27/2012] [Indexed: 10/27/2022]
Abstract
The aim of this study was to investigate the acute effects of oral glucocorticoids in doses used in clinical practice on biochemical indices of the function of osteoclasts, osteoblasts, and osteocytes. In 17 adult patients suffering from various medical pathologies requiring systemic steroid therapy that were never before treated with glucocorticoids, glucocorticoid treatment was initiated (mean prednisolone equivalent dose of 23.1 ± 12.7 mg/day, range 10-50). Fasting morning serum concentrations of osteocalcin (OC), amino-terminal propeptide of type I procollagen (PINP), type 1 collagen cross-linked C-telopeptide (βCTX), soluble receptor activator of nuclear factor kappaB ligand (sRANKL), osteoprotegerin (OPG), sclerostin, Dickkopf-1 (Dkk-1), and high-sensitivity C-reactive protein (hsCRP) were measured at baseline and on three consecutive days. Significant reductions in serum OC, PINP, OPG, sclerostin, and hsCRP were observed during 96 h of glucocorticoid administration, while serum βCTX showed a significant percentual increase. A significant positive correlation was found between serum concentrations of Dkk-1 and βCTX after 96 h of treatment with glucocorticoids. A significant drop in serum sclerostin, OPG, and OC observed in this study may reflect the rapid glucocorticoid-induced apoptosis of osteocytes.
Collapse
|
147
|
Takahata M, Maher JR, Juneja SC, Inzana J, Xing L, Schwarz EM, Berger AJ, Awad HA. Mechanisms of bone fragility in a mouse model of glucocorticoid-treated rheumatoid arthritis: implications for insufficiency fracture risk. ACTA ACUST UNITED AC 2013; 64:3649-59. [PMID: 22832945 DOI: 10.1002/art.34639] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Glucocorticoid (GC) therapy is associated with increased risk of fracture in patients with rheumatoid arthritis (RA). To elucidate the cause of this increased risk, we examined the effects of chronic erosive inflammatory arthritis and GC treatment on bone quality, structure, and biomechanical properties in a murine model. METHODS Mice with established arthritis and expressing human tumor necrosis factor α (TNFα) transgene (Tg) and their wild-type (WT) littermates were continually treated with GC (prednisolone 5 mg/kg/day via subcutaneous controlled-release pellet) or placebo for 14, 28, or 42 days. Microstructure, biomechanical properties, chemical composition, and morphology of the tibiae and lumbar vertebral bodies were assessed by micro-computed tomography, biomechanical testing, Raman spectroscopy, and histology, respectively. Serum markers of bone turnover were also determined. RESULTS TNF-Tg and GC treatment additively decreased mechanical strength and stiffness in both the tibiae and the vertebral bodies. GC treatment in the TNF-Tg mice increased the ductility of tibiae under torsional loading. These changes were associated with significant alterations in the biochemical and structural composition of the mineral and organic components of the bone matrix, a decrease in osteoblast activity and bone formation, and an increase in osteoclast activity. CONCLUSION Our findings indicate that the concomitant decrease in bone strength and increase in bone ductility associated with chronic inflammation and GC therapy, coupled with the significant changes in the bone quality and structure, may increase the susceptibility of the bone to failure under low-energy loading. This may explain the mechanism of symptomatic insufficiency fractures in patients with RA receiving GC therapy who do not have radiographic manifestations of fracture.
Collapse
|
148
|
Glucocorticoid-induced osteoporosis in children with 21-hydroxylase deficiency. BIOMED RESEARCH INTERNATIONAL 2013; 2013:250462. [PMID: 23484098 PMCID: PMC3581245 DOI: 10.1155/2013/250462] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 10/04/2012] [Indexed: 02/07/2023]
Abstract
21-Hydroxylase deficiency (21-OHD) is the most common cause of congenital adrenal hyperplasia (CAH), resulting from deletions or mutations of the P450 21-hydroxylase gene (CYP21A2). Children with 21-OHD need chronic glucocorticoid (cGC) therapy, both to replace congenital deficit in cortisol synthesis and to reduce androgen secretion by adrenal cortex. GC-induced osteoporosis (GIO) is the most common form of secondary osteoporosis that results in an early, transient increase in bone resorption accompanied by a decrease in bone formation, maintained for the duration of GC therapy. Despite the conflicting results in the literature about the bone status on GC-treated patients with 21-OHD, many reports consider these subjects to be at risk for osteoporosis and fractures. In bone cells, at the molecular level, GCs regulate various functions including osteoblastogenesis, osteoclastogenesis, and the apoptosis of osteoblasts and osteocytes. In this paper, we focus on the physiology and biosynthesis of endogenous steroid hormones as well as on the effects of GCs on bone cells, highlighting the pathogenetic mechanism of GIO in children with 21-OHD.
Collapse
|
149
|
Dore RK. Long-term safety, efficacy, and patient acceptability of teriparatide in the management of glucocorticoid-induced osteoporosis. Patient Prefer Adherence 2013; 7:435-46. [PMID: 23717037 PMCID: PMC3663438 DOI: 10.2147/ppa.s31067] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Glucocorticoids are commonly prescribed medications to treat multiple diseases across many medical specialties. One of the most common yet largely unappreciated side effect of glucocorticoid use is increased risk of fracture. Many different therapies are indicated to prevent and treat this condition; many guidelines exist that suggest appropriate use of both glucocorticoids and the medications approved to prevent this common side effect of glucocorticoid therapy. Nevertheless, 30%-50% of patients on long-term glucocorticoid therapy sustain a fracture. Teriparatide, recombinant human parathyroid hormone (1-34), is a daily self-injectable therapy for 24 months approved for use in patients taking long-term glucocorticoids. Teriparatide has been shown to increase bone mineral density and reduce vertebral fracture risk in glucocorticoid-treated patients. Glucocorticoids have many adverse effects on bone that teriparatide has been shown to prevent or negate. Given the fact that preventive therapy for glucocorticoid-induced osteoporosis is often not prescribed, one wonders whether a daily self-injectable therapy for this condition would be prescribed by physicians and accepted by patients. This article reviews the epidemiology, pathophysiology, treatment, guidelines, and persistence data (when available) for patients with glucocorticoid-induced osteoporosis treated with teriparatide.
Collapse
Affiliation(s)
- Robin K Dore
- David Geffen School of Medicine, University of California, Los Angeles, CA, USA
- Correspondence: Robin K Dore, David Geffen School of Medicine, University of California, 12791 Newport Ave #201, Tustin, CA 92780, USA Email
| |
Collapse
|
150
|
Jia J, Yao W, Amugongo S, Shahnazari M, Dai W, Lay YE, Olvera D, Zimmermann EA, Ritchie RO, Li CS, Alliston T, Lane NE. Prolonged alendronate treatment prevents the decline in serum TGF-β1 levels and reduces cortical bone strength in long-term estrogen deficiency rat model. Bone 2013; 52:424-32. [PMID: 23088940 PMCID: PMC3804116 DOI: 10.1016/j.bone.2012.10.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 10/14/2012] [Accepted: 10/15/2012] [Indexed: 12/18/2022]
Abstract
INTRODUCTION While the anti-resorptive effects of the bisphosphonates (BPs) are well documented, many questions remain about their mechanisms of action, particularly following long-term use. This study evaluated the effects of alendronate (Ale) treatment on TGF-β1 signaling in mesenchymal stem cells (MSCs) and osteocytes, and the relationship between prolonged alendronate treatment on systemic TGF-β1 levels and bone strength. METHODS TGF-β1 expression and signaling were evaluated in MSCs and osteocytic MLO-Y4 cells following Ale treatment. Serum total TGF-β1 levels, a bone resorption marker (DPD/Cr), three-dimensional microCT scans and biomechanical tests from both the trabecular and cortical bone were measured in ovariectomized rats that either received continuous Ale treatment for 360 days or Ale treatment for 120 days followed by 240 days of vehicle. Linear regression tests were performed to determine the association of serum total TGF-β1 levels and both the trabecular (vertebrae) and cortical (tibiae) bone strength. RESULTS Ale increased TGF-β1 signaling in the MSCs but not in the MLO-Y4 cells. Ale treatment increased serum TGF-β1 levels and the numbers of TGF-β1-positive osteocytes and periosteal cells in cortical bone. Serum TGF-β1 levels were not associated with vertebral maximum load and strength but was negatively associated with cortical bone maximum load and ultimate strength. CONCLUSIONS The increase of serum TGF-β1 levels during acute phase of estrogen deficiency is likely due to increased osteoclast-mediated release of matrix-derived latent TGF-β1. Long-term estrogen-deficiency generally results in a decline in serum TGF-β1 levels that are maintained by Ale treatment. Measuring serum total TGF-β1 levels may help to determine cortical bone quality following alendronate treatment.
Collapse
Affiliation(s)
- Junjing Jia
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
| | - Wei Yao
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
| | - Sarah Amugongo
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
| | - Mohammad Shahnazari
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
- Veterans Administration Medical Center, University of California, San Francisco, CA 94121
| | | | - Yuan E. Lay
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
| | - Diana Olvera
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | | | - Robert O. Ritchie
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720
| | - Chin-Shang Li
- Division of Biostatistics, Department of Public Health Sciences, University of California, Davis, CA 95616
| | - Tamara Alliston
- Department of Orthopaedic Surgery, University of California, San Francisco, CA 94143
| | - Nancy E. Lane
- Musculoskeletal Research Unit, Department of Medicine, University of California Davis Medical Center, Sacramento, CA 95817
| |
Collapse
|