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Venkatesh VS, Nie T, Golub S, Stok KS, Hemmatian H, Desai R, Handelsman DJ, Zajac JD, Grossmann M, Davey RA. High circulating concentrations of estradiol are anabolic for bone mass and strength in an adult male to female transgender mouse model. Bone 2024; 186:117143. [PMID: 38866125 DOI: 10.1016/j.bone.2024.117143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 05/29/2024] [Accepted: 05/31/2024] [Indexed: 06/14/2024]
Abstract
The effects of gender affirming hormone therapy (GAHT) on bone microarchitecture and fracture risk in adult transgender women is unclear. To investigate the concept that skeletal integrity and strength in trans women may be improved by treatment with a higher dose of GAHT than commonly prescribed, we treated adult male mice with a sustained, high dose of estradiol. Adult male mice at 16 weeks of age were administered ~1.3 mg estradiol by silastic implant, implanted intraperitoneally, for 12 weeks. Controls included vehicle treated intact females and males. High-dose estradiol treatment in males stimulated the endocortical deposition of bone at the femoral mid-diaphysis, increasing cortical thickness and bone area. This led to higher stiffness, maximum force, and the work required to fracture the bone compared to male controls, while post-yield displacement was unaffected. Assessment of the material properties of the bone showed an increase in both elastic modulus and ultimate stress in the estradiol treated males. Treatment of male mice with high dose estradiol was also anabolic for trabecular bone, markedly increasing trabecular bone volume, number and thickness in the distal metaphysis which was accompanied by an increase in the histomorphometric markers of bone remodelling, mineralizing surface/bone surface, bone formation rate and osteoclast number. In conclusion, a high dose of estradiol is anabolic for cortical and trabecular bone in a male to female transgender mouse model, increasing both stiffness and strength. These findings suggest that increasing the current dose of GAHT administered to trans women, while considering other potential adverse effects, may be beneficial to preserving their bone microstructure and strength.
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Affiliation(s)
- Varun S Venkatesh
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia; Department of Endocrinology, Austin Health, Heidelberg, Victoria, Australia.
| | - Tian Nie
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
| | - Suzanne Golub
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
| | - Kathryn S Stok
- Department of Biomedical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Haniyeh Hemmatian
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
| | - Reena Desai
- ANZAC Research Institute, University of Sydney and Andrology, Concord Repatriation General Hospital, Concord, New South Wales 2137, Australia.
| | - David J Handelsman
- ANZAC Research Institute, University of Sydney and Andrology, Concord Repatriation General Hospital, Concord, New South Wales 2137, Australia.
| | - Jeffrey D Zajac
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
| | - Mathis Grossmann
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia; Department of Endocrinology, Austin Health, Heidelberg, Victoria, Australia.
| | - Rachel A Davey
- Department of Medicine, Austin Health, University of Melbourne, Heidelberg, Victoria 3084, Australia.
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2
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Cifuentes-Mendiola SE, Solis-Suarez DL, Martínez-Dávalos A, Godínez-Victoria M, García-Hernández AL. CD4 + T-cell activation of bone marrow causes bone fragility and insulin resistance in type 2 diabetes. Bone 2022; 155:116292. [PMID: 34896656 DOI: 10.1016/j.bone.2021.116292] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 12/14/2022]
Abstract
Type 2 diabetes mellitus (T2DM) causes an increased risk of bone fractures. However, the pathophysiology of diabetic bone fragility is not completely understood. It has been proposed that an inflammatory microenvironment in bone could be a major mechanism by inducing uncontrolled bone resorption, inadequate bone formation and consequently more porous bones. We propose that activated T-cells in the bone marrow cause a pro-inflammatory microenvironment in bone, and cause bone fragility in T2DM. We induced T2DM in C57BL/6 male mice through a hypercaloric diet rich in carbohydrates and low doses of streptozocin. In T2DM mice we inhibited systemic activation of T-cells with a fusion protein between the extracellular domain of Cytotoxic T-Lymphocyte Antigen 4 and the Fc domain of human immunoglobulin G (CTLA4-Ig). We analysed the effects of T2DM or CTLA4-Ig in lymphocyte cell subsets and antigen-presenting cells in peripheral blood and femoral bone marrow; and their effect on the metabolic phenotype, blood and bone cytokine concentration, femoral bone microarchitecture and biomechanical properties, and the number of osteoblast-like cells in the femoral endosteum. We performed a Pearson multiple correlation analysis between all variables in order to understand the global mechanism. Results demonstrated that CTLA4-Ig decreased the number of activated CD4+ T-cells in the femoral bone marrow and consequently decreased TNF-α and RANK-L concentration in bone, notably improved femoral bone microarchitecture and biomechanical properties, increased the number of osteoblast-like cells, and reduces osteoclastic activity compared to T2DM mice that did not receive the inhibitor. Interestingly, we observed that blood glucose levels and insulin resistance may be related to the increase in activated CD4+ T-cells in the bone marrow. We conclude that bone marrow activated CD4+ T-cells cause poor bone quality and insulin resistance in T2DM.
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Affiliation(s)
- S E Cifuentes-Mendiola
- Laboratory of Dental Research, Section of Osteoimmunology and Oral Immunology, FES Iztacala, National Autonomous University of Mexico, A. Jiménez Gallardo SN, San Sebastián Xhala, Cuautitlán Izcalli, Estado de México, CP 54714, Mexico; Postgraduate in Biological Sciences, National Autonomous University of Mexico, Mexico, Mexico
| | - D L Solis-Suarez
- Laboratory of Dental Research, Section of Osteoimmunology and Oral Immunology, FES Iztacala, National Autonomous University of Mexico, A. Jiménez Gallardo SN, San Sebastián Xhala, Cuautitlán Izcalli, Estado de México, CP 54714, Mexico
| | - A Martínez-Dávalos
- Physics Institute, National Autonomous University of Mexico, Circuito de la Investigación Científica, Ciudad Universitaria, 04510 México City, Mexico
| | - M Godínez-Victoria
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico, Mexico
| | - A L García-Hernández
- Laboratory of Dental Research, Section of Osteoimmunology and Oral Immunology, FES Iztacala, National Autonomous University of Mexico, A. Jiménez Gallardo SN, San Sebastián Xhala, Cuautitlán Izcalli, Estado de México, CP 54714, Mexico.
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3
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Scheiber AL, Wilkinson KJ, Suzuki A, Enomoto-Iwamoto M, Kaito T, Cheah KS, Iwamoto M, Leikin S, Otsuru S. 4PBA reduces growth deficiency in osteogenesis imperfecta by enhancing transition of hypertrophic chondrocytes to osteoblasts. JCI Insight 2022; 7:149636. [PMID: 34990412 PMCID: PMC8855815 DOI: 10.1172/jci.insight.149636] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 12/21/2021] [Indexed: 11/17/2022] Open
Abstract
Short stature is a major skeletal phenotype in osteogenesis imperfecta (OI), a genetic disorder mainly caused by mutations in genes encoding type I collagen. However, the underlying mechanism is poorly understood, and no effective treatment is available. In OI mice that carry a G610C mutation in COL1A2, we previously found that mature hypertrophic chondrocytes (HCs) are exposed to cell stress due to accumulation of misfolded mutant type I procollagen in the endoplasmic reticulum (ER). By fate mapping analysis of HCs in G610C OI mice, we found that HCs stagnate in the growth plate, inhibiting translocation of HC descendants to the trabecular area and their differentiation to osteoblasts. Treatment with 4-phenylbutyric acid (4PBA), a chemical chaperone, restored HC ER structure and rescued this inhibition, resulting in enhanced longitudinal bone growth in G610C OI mice. Interestingly, the effects of 4PBA on ER dilation were limited in osteoblasts, and the bone fragility was not ameliorated. These results highlight the importance of targeting HCs to treat growth deficiency in OI. Our findings demonstrate that HC dysfunction induced by ER disruption plays a critical role in the pathogenesis of OI growth deficiency, which lays the foundation for developing new therapies for OI.
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Affiliation(s)
- Amanda L Scheiber
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
| | - Kevin J Wilkinson
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
| | - Akiko Suzuki
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
| | - Motomi Enomoto-Iwamoto
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
| | - Takashi Kaito
- Department of Orthopaedic Surgery, Osaka University, Graduate School of Medicine, Osaka, Japan
| | - Kathryn Se Cheah
- School of Biomedical Sciences, University of Hong Kong, Hong Kong, China
| | - Masahiro Iwamoto
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
| | - Sergey Leikin
- Section on Physical Biochemistry, Eunice Kennedy Shriver National Institute of Child Health & Human Developme, Bethesda, United States of America
| | - Satoru Otsuru
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, United States of America
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4
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Abstract
Raman spectroscopy (RS) is used to analyze the physiochemical properties of bone because it is non-destructive and requires minimal sample preparation. With over two decades of research involving measurements of mineral-to-matrix ratio, type-B carbonate substitution, crystallinity, and other compositional characteristics of the bone matrix by RS, there are multiple methods to acquire Raman signals from bone, to process those signals, and to determine peak ratios including sub-peak ratios as well as the full-width at half maximum of the most prominent Raman peak, which is nu1 phosphate (ν1PO4). Selecting which methods to use is not always clear. Herein, we describe the components of RS instruments and how they influence the quality of Raman spectra acquired from bone because signal-to-noise of the acquisition and the accompanying background fluorescence dictate the pre-processing of the Raman spectra. We also describe common methods and challenges in preparing acquired spectra for the determination of matrix properties of bone. This article also serves to provide guidance for the analysis of bone by RS with examples of how methods for pre-processing the Raman signals and for determining properties of bone composition affect RS sensitivity to potential differences between experimental groups. Attention is also given to deconvolution methods that are used to ascertain sub-peak ratios of the amide I band as a way to assess characteristics of collagen type I. We provide suggestions and recommendations on the application of RS to bone with the goal of improving reproducibility across studies and solidify RS as a valuable technique in the field of bone research.
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Affiliation(s)
- Mustafa Unal
- Department of Mechanical Engineering, Karamanoglu Mehmetbey University, Karaman, 70200, Turkey.
- Department of Bioengineering, Karamanoglu Mehmetbey University, Karaman, Turkey 70200
- Department of Biophysics, Faculty of Medicine, Karamanoglu Mehmetbey University, Karaman, Turkey 70200
| | - Rafay Ahmed
- Department of Orthopaedic Surgery, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
| | - Anita Mahadevan-Jansen
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, USA
- Vanderbilt Biophotonics Center, Vanderbilt University, Nashville, TN 37235, USA
- Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Otolaryngology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Surgery, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Jeffry S Nyman
- Department of Orthopaedic Surgery, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, USA
- Center for Bone Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, TN 37212, USA
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5
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Kohler R, Tastad CA, Creecy A, Wallace JM. Morphological and mechanical characterization of bone phenotypes in the Amish G610C murine model of osteogenesis imperfecta. PLoS One 2021; 16:e0255315. [PMID: 34449800 PMCID: PMC8396767 DOI: 10.1371/journal.pone.0255315] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 07/13/2021] [Indexed: 11/27/2022] Open
Abstract
Osteogenesis imperfecta (OI) is a hereditary bone disease where gene mutations affect Type I collagen formation resulting in osteopenia and increased fracture risk. There are several established mouse models of OI, but some are severe and result in spontaneous fractures or early animal death. The Amish Col1a2G610C/+ (G610C) mouse model is a newer, moderate OI model that is currently being used in a variety of intervention studies, with differing background strains, sexes, ages, and bone endpoints. This study is a comprehensive mechanical and architectural characterization of bone in G610C mice bred on a C57BL/6 inbred strain and will provide a baseline for future treatment studies. Male and female wild-type (WT) and G610C mice were euthanized at 10 and 16 weeks (n = 13–16). Harvested tibiae, femora, and L4 vertebrae were scanned via micro-computed tomography and analyzed for cortical and trabecular architectural properties. Femora and tibiae were then mechanically tested to failure. G610C mice had less bone but more highly mineralized cortical and trabecular tissue than their sex- and age-matched WT counterparts, with cortical cross-sectional area, thickness, and mineral density, and trabecular bone volume, mineral density, spacing, and number all differing significantly as a function of genotype (2 Way ANOVA with main effects of sex and genotype at each age). In addition, mechanical yield force, ultimate force, displacement, strain, and toughness were all significantly lower in G610C vs. WT, highlighting a brittle phenotype. This characterization demonstrates that despite being a moderate OI model, the Amish G610C mouse model maintains a distinctly brittle phenotype and is well-suited for use in future intervention studies.
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Affiliation(s)
- Rachel Kohler
- Department of Biomedical Engineering, Indiana University Purdue University of Indianapolis, Indianapolis, IN, United States of America
| | - Carli A Tastad
- Department of Biomedical Engineering, Indiana University Purdue University of Indianapolis, Indianapolis, IN, United States of America
| | - Amy Creecy
- Department of Biomedical Engineering, Indiana University Purdue University of Indianapolis, Indianapolis, IN, United States of America
| | - Joseph M Wallace
- Department of Biomedical Engineering, Indiana University Purdue University of Indianapolis, Indianapolis, IN, United States of America
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6
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Garibaldi N, Contento BM, Babini G, Morini J, Siciliani S, Biggiogera M, Raspanti M, Marini JC, Rossi A, Forlino A, Besio R. Targeting cellular stress in vitro improves osteoblast homeostasis, matrix collagen content and mineralization in two murine models of osteogenesis imperfecta. Matrix Biol 2021; 98:1-20. [PMID: 33798677 PMCID: PMC11162743 DOI: 10.1016/j.matbio.2021.03.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/26/2021] [Accepted: 03/26/2021] [Indexed: 12/14/2022]
Abstract
Most cases of dominantly inherited osteogenesis imperfecta (OI) are caused by glycine substitutions in the triple helical domain of type I collagen α chains, which delay collagen folding, and cause the synthesis of collagen triple helical molecules with abnormal structure and post-translational modification. A variable extent of mutant collagen ER retention and other secondary mutation effects perturb osteoblast homeostasis and impair bone matrix quality. Amelioration of OI osteoblast homeostasis could be beneficial both to osteoblast anabolic activity and to the content of the extracellular matrix they deposit. Therefore, the effect of the chemical chaperone 4-phenylbutyrate (4-PBA) on cell homeostasis, collagen trafficking, matrix production and mineralization was investigated in primary osteoblasts from two murine models of moderate OI, Col1a1+/G349C and Col1a2+/G610C. At the cellular level, 4-PBA prevented intracellular accumulation of collagen and increased protein secretion, reducing aggregates within the mutant cells and normalizing ER morphology. At the extracellular level, increased collagen incorporation into matrix, associated with more mature collagen fibrils, was observed in osteoblasts from both models. 4-PBA also promoted OI osteoblast mineral deposition by increasing alkaline phosphatase expression and activity. Targeting osteoblast stress with 4-PBA improved both cellular and matrix abnormalities in culture, supporting further in vivo studies of its effect on bone tissue composition, strength and mineralization as a potential treatment for classical OI.
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Affiliation(s)
- Nadia Garibaldi
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy; Istituto Universitario di Studi Superiori - IUSS, Pavia, Italy.
| | - Barbara M Contento
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy.
| | | | - Jacopo Morini
- Department of Physics, University of Pavia, Pavia, Italy.
| | - Stella Siciliani
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy.
| | - Marco Biggiogera
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy.
| | - Mario Raspanti
- Department of Medicine and Surgery, University of Insubria, Varese, Italy.
| | - Joan C Marini
- Bone and Extracellular Matrix Branch, NICHD, National Institute of Health, Bethesda, MD 20892, USA.
| | - Antonio Rossi
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy.
| | - Antonella Forlino
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy.
| | - Roberta Besio
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy.
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7
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Pragnère S, Auregan JC, Bosser C, Linglart A, Bensidhoum M, Hoc T, Nouguier-Lehon C, Chaussain C. Human dentin characteristics of patients with osteogenesis imperfecta: insights into collagen-based biomaterials. Acta Biomater 2021; 119:259-267. [PMID: 33122145 DOI: 10.1016/j.actbio.2020.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 10/05/2020] [Accepted: 10/22/2020] [Indexed: 11/28/2022]
Abstract
Osteogenesis imperfecta (OI), also known as "brittle bone disease", is a rare genetic disorder of the skeleton, whose most benign form I corresponds to autosomal dominant mutations in the genes encoding type I collagen (COLA1, COLA2). Several associated skeletal manifestations are often observed but, surprisingly, while dentin defects often reflect genetic bone disorders, about half of OI patients have no obvious oral manifestations. Here, we investigated the collagen, mineral and mechanical properties of dentin from deciduous teeth collected from patients with mild form of OI and displaying no obvious clinical signs of dentinogenesis imperfecta. For the first time, an increase in the hardness of OI dentin associated with an increase in mineral content compared to healthy patients was reported. In addition, OI altered the tissue characteristics of the dentin-enamel junction but the interfacial gradient was preserved. The impact of changes in molecular structure due to mutations in OI was assessed by Raman microspectroscopy. Our results highlighted a change in the hydroxyproline-proline ratio in direct association with collagen mineralization. Our findings suggest that the evaluation of teeth could be an important aid for mild types of OI that are often difficult to diagnose clinically and provide experimental evidence that hydroxyproline content should be considered in future studies on collagen-based biomaterials.
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Affiliation(s)
- S Pragnère
- Equipex IVTV, Centrale Innovation, 64 Chemin des Mouilles, 69130 Ecully, France
| | - J-C Auregan
- Université de Paris, B3OA, UMR CNRS 7052, INSERM U1271, 10 Avenue de Verdun, 75010 Paris, France; AP-HP, Antoine Béclère Université Paris-Saclay hospital, Orthopeadics Department, 157, rue de la Porte de Trivaux, 92140 Clamart, France
| | - C Bosser
- Equipex IVTV, Centrale Innovation, 64 Chemin des Mouilles, 69130 Ecully, France
| | - A Linglart
- Université de Paris Saclay, Le Kremlin-Bicêtre, France; AP-HP, Department of Endocrinology and Diabetology for children, Reference Center for Rare Disorders of the Calcium and Phosphate Metabolism, Filière OSCAR and Platform of expertise for rare diseases Paris-Sud, Bicêtre Paris-Saclay Hospital, Le Kremlin-Bicêtre, France
| | - M Bensidhoum
- Université de Paris, B3OA, UMR CNRS 7052, INSERM U1271, 10 Avenue de Verdun, 75010 Paris, France
| | - T Hoc
- Université de Paris, B3OA, UMR CNRS 7052, INSERM U1271, 10 Avenue de Verdun, 75010 Paris, France; Mechanical Department, MSGMGC, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, France.
| | - C Nouguier-Lehon
- Université de Lyon, LTDS UMR CNRS 5513, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully Cedex, France
| | - C Chaussain
- Université de Paris, Dental School, UR2496, Montrouge, F-92120, France; AP-HP Reference Center for Rare Disorders of the Calcium and Phosphate Metabolism (OSCAR, ERN Bond), Dental Medicine Department, Bretonneau Hospital, GHN, 75018 Paris, France
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8
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Taylor EA, Donnelly E. Raman and Fourier transform infrared imaging for characterization of bone material properties. Bone 2020; 139:115490. [PMID: 32569874 DOI: 10.1016/j.bone.2020.115490] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 06/08/2020] [Accepted: 06/11/2020] [Indexed: 12/12/2022]
Abstract
As the application of Raman spectroscopy to study bone has grown over the past decade, making it a peer technology to FTIR spectroscopy, it has become critical to understand their complimentary roles. Recent technological advancements have allowed these techniques to collect grids of spectra in a spatially resolved fashion to generate compositional images. The advantage of imaging with these techniques is that it allows the heterogenous bone tissue composition to be resolved and quantified. In this review we compare, for non-experts in the field of vibrational spectroscopy, the instrumentation and underlying physical principles of FTIR imaging (FTIRI) and Raman imaging. Additionally, we discuss the strengths and limitations of FTIR and Raman spectroscopy, address sample preparation, and discuss outcomes to provide researchers insight into which techniques are best suited for a given research question. We then briefly discuss previous applications of FTIRI and Raman imaging to characterize bone tissue composition and relationships of compositional outcomes with mechanical performance. Finally, we discuss emerging technical developments in FTIRI and Raman imaging which provide new opportunities to identify changes in bone tissue composition with disease, age, and drug treatment.
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Affiliation(s)
- Erik A Taylor
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, United States of America
| | - Eve Donnelly
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, United States of America; Research division, Hospital for Special Surgery, New York, NY, United States of America.
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9
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Zhu J, Liu C, Jia J, Zhang C, Yuan W, Leng H, Xu Y, Song C. Short-term caloric restriction induced bone loss in both axial and appendicular bones by increasing adiponectin. Ann N Y Acad Sci 2020; 1474:47-60. [PMID: 32469430 DOI: 10.1111/nyas.14380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/30/2020] [Accepted: 05/05/2020] [Indexed: 12/13/2022]
Abstract
Caloric restriction (CR) is well described and has received extensive attention for its multiple benefits, including longevity and stress resistance. However, some studies have shown that CR negatively influences bone, although a mechanism hasn't been provided. Adiponectin, an adipocyte-derived hormone, can affect bone metabolism by various pathways. To explore the role of adiponectin in short-term CR on bone, we tested the effect of short-term CR on limb bones (tibia and femur) and lumbar vertebral bodies of young C57BL/6 wild-type (WT) and adiponectin-deficient (Apn-/- ) mice. Two dietary regimes, ad libitum (AL) and CR (70% of the AL diet), were used. Dietary restriction led to increased serum adiponectin in WT mice, while bone mineral density, bone microarchitecture, and biomechanical outcomes of limb bone and vertebrae were decreased. In contrast, bone length, microarchitecture, and biomechanical outcomes were not impaired after CR in Apn-/- mice. Furthermore, CR increased adiponectin expression both in white adipose tissue and bone marrow adipose tissue in young WT mice. Histology analysis showed that expansion of bone marrow adipose tissue after CR in Apn-/- mice was impaired compared with WT mice. These results suggest that increased adiponectin induced by short-term CR may negatively influence bones.
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Affiliation(s)
- Junxiong Zhu
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
| | - Can Liu
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
| | - Jialin Jia
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
| | - Chenggui Zhang
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
| | - Wanqiong Yuan
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
| | - Huijie Leng
- Department of Orthopedics, Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Spinal Diseases, Beijing, China
| | - Yingsheng Xu
- Department of Neurology, Peking University Third Hospital, Beijing, China
| | - Chunli Song
- Department of Orthopedics, Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Spinal Diseases, Beijing, China
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10
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Zhao L, He X, Todoh M. Mechanical behavior of biomimetically mineralized collagen matrix using the polymer - induced liquid precursor process. J Biomech 2020; 104:109738. [PMID: 32188573 DOI: 10.1016/j.jbiomech.2020.109738] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 02/29/2020] [Accepted: 02/29/2020] [Indexed: 11/30/2022]
Abstract
Biomimetic mineralization is a promising technique in biomedical applications. To understand the mechanical behavior of biomimetically mineralized collagen material (BMC), we examined the composition and structure of the mineral deposition in BMCs mineralized by the polymer-induced liquid precursor (PILP) process and applied wide angle x-ray scattering (WAXS) with in situ tensile testing to investigate the mineral-to-tissue co-deformation in the material. We found that the PILP process is able to achieve good biomimetic mineralization in bulk collagen matrix. Compositionally, the mineral deposition showed high crystallinity with no carbonation. However, the morphology of extrafibrillar mineral deposition and the preferential crystal orientation were different from natural bone. Further, the Young's modulus and mineral-to-tissue co-deformation ratio of the BMC were significantly lower than both natural bone and partially demineralized bone with similar mineral volume fraction. It was concluded that while biomimetic mineralization can achieve good mineral deposition volume in the BMC, the mechanical behavior of the material was different from natural bone.
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Affiliation(s)
- Lei Zhao
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan.
| | - Xingming He
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan
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11
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Liu S, Bi J, Zhang Y, Song Q, Yu M, Sun X, Qu D, Liu S. Preliminary study on the electromagnetic field treatment of osteoporosis in rats. Technol Health Care 2020; 28:47-55. [PMID: 32364143 PMCID: PMC7369098 DOI: 10.3233/thc-209006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE: In our study, the influence of PEMF on skeleton morphology and bone metabolism on rats with disuse osteoporosis was investigated, and the possibility of using it for the treatment of disuse osteoporosis was explored. METHODS: The rats in the ALN group were treated with alendronate, and the rats in the PEMF group were exposed to pulsed electromagnetic fields (3.82 mT, 10 Hz) for 40 mind-1. Rats were sacrificed by the end of 2, 4, 8 and 12 weeks, and serum and right leg bones were collected. Serum BMP-2, BGP concentrations and bone metabolism and biomechanical parameters were measured. RESULTS: The bone structural mechanical indices and material mechanical indices of the right femur in all groups of mice during weeks 2 and 4 were decreased. At week 8 the bone structural mechanical index and maximum stress of the right femur in the ALN group were markedly raised compared with the CON group (P< 0.01). Only maximum stress and strain were improved in the ALN group and had a significant difference (P< 0.05) at week 12. The serum BGP and BMP-2 concentration in the PEMF and ALN groups was increased (P< 0.05) at week 2, but this increase was not synchronized. After 8 weeks, BGP and BMP-2 level in the PEMF group was observably elevated (P<0.01) in contrast to the ALN group. CONCLUSION: From the experimental time interval analysis, PEMF can improve the mechanical stability of bone structure more gently and permanently than alendronate.
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Affiliation(s)
- Shengnan Liu
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China.,Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Jiaqi Bi
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China.,Orthopaedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100042, China.,Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Ying Zhang
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Qiushi Song
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Miao Yu
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Xiaowei Sun
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Daofei Qu
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
| | - Shaoting Liu
- Study Center, The First Hospital of Harbin City, Harbin, Heilongjiang, 150010, China
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12
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Therapeutic Interventions to Reduce Radiation Induced Dermal Injury in a Murine Model of Tissue Expander Based Breast Reconstruction. Ann Plast Surg 2020; 85:546-552. [PMID: 32187064 DOI: 10.1097/sap.0000000000002264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Radiation therapy (XRT) induced dermal injury disrupts type I collagen architecture. This impairs cutaneous viscoelasticity, which may contribute to the high rate of complications in expander-based breast reconstruction with adjuvant XRT. The objective of this study was to further elucidate the mechanism of radiation-induced dermal injury and to determine if amifostine (AMF) or deferoxamine (DFO) mitigates type I collagen injury in an irradiated murine model of expander-based breast reconstruction. METHODS Female Lewis rats (n = 20) were grouped: expander (control), expander-XRT (XRT), expander-XRT-AMF (AMF), and expander-XRT-DFO (DFO). Expanders were surgically placed. All XRT groups received 28 Gy of XRT. The AMF group received AMF 30 minutes before XRT, and the DFO group used a patch for delivery 5 days post-XRT. After a 20-day recovery period, skin was harvested. Atomic force microscopy and Raman spectroscopy were performed to evaluate type I collagen sheet organization and tissue compositional properties, respectively. RESULTS Type I collagen fibril disorganization was significantly increased in the XRT group compared with the control (83.8% vs 22.4%; P = 0.001). Collagen/matrix ratios were greatly reduced in the XRT group compared with the control group (0.49 ± 0.09 vs 0.66 ± 0.09; P = 0.017). Prophylactic AMF demonstrated a marked reduction in type I collagen fibril disorganization on atomic force microscopy (15.9% vs 83.8%; P = 0.001). In fact, AMF normalized type I collagen organization in irradiated tissues to the level of the nonirradiated control (P = 0.122). Based on Raman spectroscopy, both AMF and DFO demonstrated significant differential protective effects on expanded-irradiated tissues. Collagen/matrix ratios were significantly preserved in the AMF group compared with the XRT group (0.49 ± 0.09 vs 0.69 ± 0.10; P = 0.010). β-Sheet/α-helix ratios were significantly increased in the DFO group compared with the XRT group (1.76 ± 0.03 vs 1.86 ± 0.06; P = 0.038). CONCLUSIONS Amifostine resulted in a significant improvement in type I collagen fibril organization and collagen synthesis, whereas DFO mitigated abnormal changes in collagen secondary structure in an irradiated murine model of expander-based breast reconstruction. These therapeutics offer the ability to retain the native microarchitecture of type I collagen after radiation. Amifostine and DFO may offer clinical utility to reduce radiation induced dermal injury, potentially decreasing the high complication rate of expander-based breast reconstruction with adjuvant XRT and improving surgical outcomes.
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Marzin P, Cormier-Daire V. New perspectives on the treatment of skeletal dysplasia. Ther Adv Endocrinol Metab 2020; 11:2042018820904016. [PMID: 32166011 PMCID: PMC7054735 DOI: 10.1177/2042018820904016] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 01/13/2020] [Indexed: 12/19/2022] Open
Abstract
The last few decades have been marked by the identification of numerous genes implicated in genetic disorders, helping in the elucidation of the underlying pathophysiology of these conditions. This has allowed new therapeutic approaches to emerge such as cellular therapy, gene therapy, or pharmacological therapy for various conditions. Skeletal dysplasias are good models to illustrate these scientific advances. Indeed, several therapeutic strategies are currently being investigated in osteogenesis imperfecta; there are ongoing clinical trials based on pharmacological approaches, targeting signaling pathways in achondroplasia and fibrodysplasia ossificans progressiva or the endoplasmic reticulum stress in metaphyseal dysplasia type Schmid or pseudoachondroplasia. Moreover, the treatment of hypophosphatasia or Morquio A disease illustrates the efficacy of enzyme drug replacement. To provide a highly specialized multidisciplinary approach, these treatments are managed by reference centers. The emergence of treatments in skeletal dysplasia provides new perspectives on the prognosis of these severe conditions and may change prenatal counseling in these diseases over the coming years.
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Affiliation(s)
- Pauline Marzin
- Clinical Genetics, INSERM UMR 1163, Paris
Descartes-Sorbonne Paris Cité University, IMAGINE Institute, Necker Enfants
Malades Hospital, Paris, France
| | - Valérie Cormier-Daire
- Clinical Genetics, INSERM UMR 1163, Paris
Descartes-Sorbonne Paris Cité University, IMAGINE Institute, Necker Enfants
Malades Hospital, 149 rue de sevres, Paris, 75015, France
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14
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Cabral WA, Fratzl-Zelman N, Weis M, Perosky JE, Alimasa A, Harris R, Kang H, Makareeva E, Barnes AM, Roschger P, Leikin S, Klaushofer K, Forlino A, Backlund PS, Eyre DR, Kozloff KM, Marini JC. Substitution of murine type I collagen A1 3-hydroxylation site alters matrix structure but does not recapitulate osteogenesis imperfecta bone dysplasia. Matrix Biol 2020; 90:20-39. [PMID: 32112888 DOI: 10.1016/j.matbio.2020.02.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/18/2020] [Accepted: 02/18/2020] [Indexed: 01/18/2023]
Abstract
Null mutations in CRTAP or P3H1, encoding cartilage-associated protein and prolyl 3-hydroxylase 1, cause the severe bone dysplasias, types VII and VIII osteogenesis imperfecta. Lack of either protein prevents formation of the ER prolyl 3-hydroxylation complex, which catalyzes 3Hyp modification of types I and II collagen and also acts as a collagen chaperone. To clarify the role of the A1 3Hyp substrate site in recessive bone dysplasia, we generated knock-in mice with an α1(I)P986A substitution that cannot be 3-hydroxylated. Mutant mice have normal survival, growth, femoral breaking strength and mean bone mineralization. However, the bone collagen HP/LP crosslink ratio is nearly doubled in mutant mice, while collagen fibril diameter and bone yield energy are decreased. Thus, 3-hydroxylation of the A1 site α1(I)P986 affects collagen crosslinking and structural organization, but its absence does not directly cause recessive bone dysplasia. Our study suggests that the functions of the modification complex as a collagen chaperone are thus distinct from its role as prolyl 3-hydroxylase.
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Affiliation(s)
- Wayne A Cabral
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, MD, USA
| | - Nadja Fratzl-Zelman
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - MaryAnn Weis
- Orthopaedic Research Laboratories, University of Washington, Seattle, WA, USA
| | - Joseph E Perosky
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Adrienne Alimasa
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Rachel Harris
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Heeseog Kang
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, MD, USA
| | - Elena Makareeva
- Section on Physical Biochemistry, NICHD, NIH, Bethesda, MD, USA
| | - Aileen M Barnes
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, MD, USA
| | - Paul Roschger
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - Sergey Leikin
- Section on Physical Biochemistry, NICHD, NIH, Bethesda, MD, USA
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - Antonella Forlino
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy
| | - Peter S Backlund
- Biomedical Mass Spectrometry Facility, NICHD, NIH, Bethesda, MD, USA
| | - David R Eyre
- Orthopaedic Research Laboratories, University of Washington, Seattle, WA, USA
| | - Kenneth M Kozloff
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Joan C Marini
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, MD, USA.
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15
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Brankovič J, Fazarinc G, Antanasova M, Jevnikar P, Jan J, Anders I, Pavšič Vrtač K, Jakovac Strajn B, Antolinc D, Vrecl M. Lactational exposure to dioxin-like polychlorinated biphenyl 169 and nondioxin-like polychlorinated biphenyl 155: Effects on rat femur growth, biomechanics and mineral composition. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 180:106-113. [PMID: 31078017 DOI: 10.1016/j.ecoenv.2019.04.076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 03/22/2019] [Accepted: 04/25/2019] [Indexed: 05/20/2023]
Abstract
Exposure to polychlorinated biphenyls (PCBs), which are persistent lipophilic environmental pollutants, has a variety of adverse effects on wildlife and human health, including bone mineralization, growth and mechanical strength. The present study evaluated the effects of lactational exposure to nondioxin-like PCB-155 and dioxin-like PCB-169, individually and in combination, on pubertal rat femur development and its biomechanics. After offspring delivery, Wistar rat mothers were divided into four groups, i.e., PCB-169, PCB-155, PCB-155+169 and control, and were administered PCBs intraperitoneally. Data on bone geometry, biomechanics and mineral composition were obtained by analysis of femurs from 42-day-old offspring by microCT scanning, three-point bending test and inductively coupled plasma mass spectrometry. Decreased somatic mass and femur size, i.e., mass, periosteal circumference and cross sectional area, were observed in the PCB-169 and PCB-155 groups. Additionally, lactational exposure to planar PCB-169 resulted in harder and more brittle bones containing higher amounts of minerals. Combined exposure to structurally and functionally different PCBs demonstrated only mild alterations in bone width and mineralization. To conclude, our results demonstrated that alterations, observed on postnatal day 42, were primarily induced by PCB-169, while toxicity from both of the individual congeners may have been reduced in the combined group.
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Affiliation(s)
- Jana Brankovič
- Institute of Preclinical Sciences, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, Ljubljana, Slovenia.
| | - Gregor Fazarinc
- Institute of Preclinical Sciences, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, Ljubljana, Slovenia
| | - Maja Antanasova
- Department of Prosthodontics and Normal Dental Morphology, Faculty of Medicine, University of Ljubljana, Hrvatski Trg 6, Ljubljana, Slovenia
| | - Peter Jevnikar
- Department of Prosthodontics and Normal Dental Morphology, Faculty of Medicine, University of Ljubljana, Hrvatski Trg 6, Ljubljana, Slovenia
| | - Janja Jan
- Department of Dental Diseases and Normal Dental Morphology, Faculty of Medicine, University of Ljubljana, Hrvatski Trg 6, Ljubljana, Slovenia
| | - Ines Anders
- CF Alternative Biomodels and Preclinical Imaging, Department for Biomedical Research, Medical University of Graz, Roseggerweg 48, Graz, Austria
| | - Katarina Pavšič Vrtač
- Institute of Food Safety, Feed and Environment, Department of Environment, Animal Nutrition, Welfare and Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, Ljubljana, Slovenia
| | - Breda Jakovac Strajn
- Institute of Food Safety, Feed and Environment, Department of Environment, Animal Nutrition, Welfare and Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, Ljubljana, Slovenia
| | - David Antolinc
- Chair for Testing in Materials and Structures, Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, Ljubljana, Slovenia
| | - Milka Vrecl
- Institute of Preclinical Sciences, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, Ljubljana, Slovenia
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Mitxitorena I, Infante A, Gener B, Rodríguez CI. Suitability and limitations of mesenchymal stem cells to elucidate human bone illness. World J Stem Cells 2019; 11:578-593. [PMID: 31616536 PMCID: PMC6789184 DOI: 10.4252/wjsc.v11.i9.578] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 07/31/2019] [Accepted: 08/27/2019] [Indexed: 02/06/2023] Open
Abstract
Functional impairment of mesenchymal stem cells (MSCs), osteoblast progenitor cells, has been proposed to be a pathological mechanism contributing to bone disorders, such as osteoporosis (the most common bone disease) and other rare inherited skeletal dysplasias. Pathological bone loss can be caused not only by an enhanced bone resorption activity but also by hampered osteogenic differentiation of MSCs. The majority of the current treatment options counteract bone loss, and therefore bone fragility by blocking bone resorption. These so-called antiresorptive treatments, in spite of being effective at reducing fracture risk, cannot be administered for extended periods due to security concerns. Therefore, there is a real need to develop osteoanabolic therapies to promote bone formation. Human MSCs emerge as a suitable tool to study the etiology of bone disorders at the cellular level as well as to be used for cell therapy purposes for bone diseases. This review will focus on the most relevant findings using human MSCs as an in vitro cell model to unravel pathological bone mechanisms and the application and outcomes of human MSCs in cell therapy clinical trials for bone disease.
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Affiliation(s)
- Izaskun Mitxitorena
- Stem Cells and Cell Therapy Laboratory, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo 48903, Bizkaia, Spain
| | - Arantza Infante
- Stem Cells and Cell Therapy Laboratory, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo 48903, Bizkaia, Spain
| | - Blanca Gener
- Stem Cells and Cell Therapy Laboratory, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo 48903, Bizkaia, Spain
- Service of Genetics, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo 48903, Bizkaia, Spain
- Centre for Biomedical Network Research on Rare Diseases, Instituto de Salud Carlos III, Madrid 28005, Spain
| | - Clara I Rodríguez
- Stem Cells and Cell Therapy Laboratory, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo 48903, Bizkaia, Spain
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17
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Kozloff KM. Osteogenesis Imperfecta: A Need to Understand Divergent Treatment Outcomes in a Disorder Rich in Heterogeneity. J Bone Miner Res 2019; 34:205-206. [PMID: 30645778 DOI: 10.1002/jbmr.3647] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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18
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Tauer JT, Abdullah S, Rauch F. Effect of Anti-TGF-β Treatment in a Mouse Model of Severe Osteogenesis Imperfecta. J Bone Miner Res 2019; 34:207-214. [PMID: 30357929 DOI: 10.1002/jbmr.3617] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 10/09/2018] [Accepted: 10/16/2018] [Indexed: 12/14/2022]
Abstract
Osteogenesis imperfecta (OI) is a heritable bone fragility disorder that is usually caused by mutations affecting collagen type I encoding genes. Recent studies in mouse models of recessive OI, Crtap-/- mice, and dominant OI, +/G610C mice, found that application of a transforming growth factor beta (TGF-β) neutralizing antibody 1D11 rescues the bone phenotype. In the present study, we investigated TGF-β signaling in a mouse model of severe dominant OI with a high incidence of spontaneous fractures, Col1a1Jrt/+ mice, and the effect of TGF-β neutralizing antibody 1D11 on bone phenotype in 8-week-old mice. Col1a1Jrt/+ mice had elevated TGF-β signaling in bone tissue. Treatment of Col1a1Jrt/+ mice with 1D11 was associated with increased bone length but had no significant effect on bone mass or bone mechanical properties, and no significant treatment-associated differences in serum markers of bone formation (alkaline phosphatase activity) or resorption (tartrate-resistant acid phosphatase) were found. Our data thus indicate that the TGF-β neutralizing antibody 1D11 is not effective in a mouse model of dominant OI with a high incidence of spontaneous fractures. © 2018 American Society for Bone and Mineral Research.
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Affiliation(s)
| | - Sami Abdullah
- Shriners Hospital for Children-Canada, Montreal, Quebec, Canada
| | - Frank Rauch
- Shriners Hospital for Children-Canada, Montreal, Quebec, Canada
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19
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Bailey S, Vashishth D. Mechanical Characterization of Bone: State of the Art in Experimental Approaches-What Types of Experiments Do People Do and How Does One Interpret the Results? Curr Osteoporos Rep 2018; 16:423-433. [PMID: 29915968 PMCID: PMC8078087 DOI: 10.1007/s11914-018-0454-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW The mechanical integrity of bone is determined by the direct measurement of bone mechanical properties. This article presents an overview of the current, most common, and new and upcoming experimental approaches for the mechanical characterization of bone. The key outcome variables of mechanical testing, as well as interpretations of the results in the context of bone structure and biology are also discussed. RECENT FINDINGS Quasi-static tests are the most commonly used for determining the resistance to structural failure by a single load at the organ (whole bone) level. The resistance to crack initiation or growth by fracture toughness testing and fatigue loading offers additional and more direct characterization of tissue material properties. Non-traditional indentation techniques and in situ testing are being increasingly used to probe the material properties of bone ultrastructure. Destructive ex vivo testing or clinical surrogate measures are considered to be the gold standard for estimating fracture risk. The type of mechanical test used for a particular investigation depends on the length scale of interest, where the outcome variables are influenced by the interrelationship between bone structure and composition. Advancement in the sensitivity of mechanical characterization techniques to detect changes in bone at the levels subjected to modifications by aging, disease, and/or pharmaceutical treatment is required. As such, a number of techniques are now available to aid our understanding of the factors that contribute to fracture risk.
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Affiliation(s)
- Stacyann Bailey
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY, 12180, USA
| | - Deepak Vashishth
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY, 12180, USA.
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20
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Makareeva E, Sun G, Mirigian LS, Mertz EL, Vera JC, Espinoza NA, Yang K, Chen D, Klein TE, Byers PH, Leikin S. Substitutions for arginine at position 780 in triple helical domain of the α1(I) chain alter folding of the type I procollagen molecule and cause osteogenesis imperfecta. PLoS One 2018; 13:e0200264. [PMID: 29990383 PMCID: PMC6039012 DOI: 10.1371/journal.pone.0200264] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 06/24/2018] [Indexed: 01/30/2023] Open
Abstract
OI is a clinically and genetically heterogeneous disorder characterized by bone fragility. More than 90% of patients are heterozygous for mutations in type I collagen genes, COL1A1 and COL1A2, and a common mutation is substitution for an obligatory glycine in the triple helical Gly-X-Y repeats. Few non-glycine substitutions in the triple helical domain have been reported; most result in Y-position substitutions of arginine by cysteine. Here, we investigated leucine and cysteine substitutions for one Y-position arginine, p.Arg958 (Arg780 in the triple helical domain) of proα1(I) chains that cause mild OI. We compared their effects with two substitutions for glycine located in close proximity. Like substitutions for glycine, those for arginine reduced the denaturation temperature of the whole molecule and caused asymmetric posttranslational overmodification of the chains. Circular dichroism and increased susceptibility to cleavage by MMP1, MMP2 and catalytic domain of MMP1 revealed significant destabilization of the triple helix near the collagenase cleavage site. On a cellular level, we observed slower triple helix folding and intracellular collagen retention, which disturbed the Endoplasmic Reticulum function and affected matrix deposition. Molecular dynamic modeling suggested that Arg780 substitutions disrupt the triple helix structure and folding by eliminating hydrogen bonds of arginine side chains, in addition to preventing HSP47 binding. The pathogenic effects of these non-glycine substitutions in bone are probably caused mostly by procollagen misfolding and its downstream effects.
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Affiliation(s)
- Elena Makareeva
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Guoli Sun
- Department of Pathology, University of Washington, Seattle, Washington, United States of America
| | - Lynn S. Mirigian
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Edward L. Mertz
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Juan C. Vera
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Nydea A. Espinoza
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Kathleen Yang
- Department of Pathology, University of Washington, Seattle, Washington, United States of America
| | - Diana Chen
- Department of Pathology, University of Washington, Seattle, Washington, United States of America
| | - Teri E. Klein
- Department of Genetics, Stanford University, Palo Alto, California, United States of America
| | - Peter H. Byers
- Department of Pathology, University of Washington, Seattle, Washington, United States of America
- Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, Washington, United States of America
| | - Sergey Leikin
- Section on Physical Biochemistry, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
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21
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Boskey AL, Spevak L, Ma Y, Wang H, Bauer DC, Black DM, Schwartz AV. Insights into the bisphosphonate holiday: a preliminary FTIRI study. Osteoporos Int 2018; 29:699-705. [PMID: 29204959 DOI: 10.1007/s00198-017-4324-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 11/21/2017] [Indexed: 12/23/2022]
Abstract
UNLABELLED Bone composition evaluated by FTIRI analysis of iliac crest biopsies from post-menopausal women treated with alendronate for 10 years, continuously or alendronate for 5 years, followed by a 5-year alendronate-holiday, only differed with the discontinued biopsies having increased cortical crystallinity and heterogeneity of acid phosphate substitution and decreased trabecular crystallinity heterogeneity. INTRODUCTION Bisphosphonates (BP) are the most commonly used and effective drugs to prevent fragility fractures; however, concerns exist that prolonged use may lead to adverse events. Recent recommendations suggest consideration of a BP "holiday" in individuals taking long-term BP therapy not at high risk of fracture. Data supporting or refuting this recommendation based on bone quality are limited. We hypothesized that a "holiday" of 5 years would cause no major bone compositional changes. METHODS We analyzed the 31 available biopsies from the FLEX-Long-term Extension of FIT (Fracture Intervention Trial) using Fourier transform infrared imaging (FTIRI). Biopsies from two groups of post-menopausal women, a "Continuously treated group" (N = 16) receiving alendronate for ~ 10 years and a "Discontinued group" (N = 15), alendronate treated for 5 years taking no antiresorptive medication during the following 5 years. Iliac crest bone biopsies were provided at 10 years. RESULTS Key FTIRI parameters, mineral-to-matrix ratio, carbonate-to-phosphate ratio, acid phosphate substitution, and collagen cross-link ratio as well as heterogeneity of these parameters were similar for Continuously treated and Discontinued groups in age-adjusted models. The Discontinued group had 2% greater cortical crystallinity (p = 0.01), 31% greater cortical acid phosphate heterogeneity (p = 0.02), and 24% lower trabecular crystallinity heterogeneity (p = 0.02). CONCLUSIONS Discontinuation of alendronate for 5 years did not affect key FTIRI parameters, supporting the hypothesis that discontinuation would have little impact on bone composition. Modest differences were observed in three parameters that are not likely to affect bone mechanical properties. These preliminary data suggest that a 5-year BP holiday is not harmful to bone composition.
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Affiliation(s)
- A L Boskey
- Hospital for Special Surgery, New York, NY, USA
| | - L Spevak
- Hospital for Special Surgery, New York, NY, USA
| | - Y Ma
- The George Washington University, Washington, DC, USA
| | - H Wang
- The George Washington University, Washington, DC, USA
| | - D C Bauer
- University of California San Francisco, San Francisco, CA, USA
| | - D M Black
- University of California San Francisco, San Francisco, CA, USA
| | - A V Schwartz
- University of California San Francisco, San Francisco, CA, USA.
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Boskey AL, Imbert L. Bone quality changes associated with aging and disease: a review. Ann N Y Acad Sci 2018; 1410:93-106. [PMID: 29265417 DOI: 10.1111/nyas.13572] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 11/11/2017] [Accepted: 11/13/2017] [Indexed: 12/11/2022]
Abstract
Bone quality encompasses all the characteristics of bone that, in addition to density, contribute to its resistance to fracture. In this review, we consider changes in architecture, porosity, and composition, including collagen structure, mineral composition, and crystal size. These factors all are known to vary with tissue and animal ages, and health status. Bone morphology and presence of microcracks, which also contribute to bone quality, will not be discussed in this review. Correlations with mechanical performance for collagen cross-linking, crystallinity, and carbonate content are contrasted with mineral content. Age-dependent changes in humans and rodents are discussed in relation to rodent models of disease. Examples are osteoporosis, osteomalacia, osteogenesis imperfecta (OI), and osteopetrosis in both humans and animal models. Each of these conditions, along with aging, is associated with increased fracture risk for distinct reasons.
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Affiliation(s)
- Adele L Boskey
- Mineralized Tissue Laboratory, Hospital for Special Surgery, New York, New York.,Department of Biochemistry, Weill Cornell Medical College, New York, New York
| | - Laurianne Imbert
- Mineralized Tissue Laboratory, Hospital for Special Surgery, New York, New York
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23
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Lietman CD, Lim J, Grafe I, Chen Y, Ding H, Bi X, Ambrose CG, Fratzl-Zelman N, Roschger P, Klaushofer K, Wagermaier W, Schmidt I, Fratzl P, Rai J, Weis M, Eyre D, Keene DR, Krakow D, Lee BH. Fkbp10 Deletion in Osteoblasts Leads to Qualitative Defects in Bone. J Bone Miner Res 2017; 32:1354-1367. [PMID: 28206698 PMCID: PMC5466482 DOI: 10.1002/jbmr.3108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 02/08/2017] [Accepted: 02/14/2017] [Indexed: 12/21/2022]
Abstract
Osteogenesis imperfecta (OI), also known as brittle bone disease, displays a spectrum of clinical severity from mild (OI type I) to severe early lethality (OI type II), with clinical features including low bone mass, fractures, and deformities. Mutations in the FK506 Binding Protein 10 (FKBP10), gene encoding the 65-kDa protein FKBP65, cause a recessive form of OI and Bruck syndrome, the latter being characterized by joint contractures in addition to low bone mass. We previously showed that Fkbp10 expression is limited to bone, tendon, and ligaments in postnatal tissues. Furthermore, in both patients and Fkbp10 knockout mice, collagen telopeptide hydroxylysine crosslinking is dramatically reduced. To further characterize the bone specific contributions of Fkbp10, we conditionally ablated FKBP65 in Fkbp10fl/fl mice (Mus musculus; C57BL/6) using the osteoblast-specific Col1a1 2.3-kb Cre recombinase. Using μCT, histomorphometry and quantitative backscattered electron imaging, we found minimal alterations in the quantity of bone and no differences in the degree of bone matrix mineralization in this model. However, mass spectroscopy (MS) of bone collagen demonstrated a decrease in mature, hydroxylysine-aldehyde crosslinking. Furthermore, bone of mutant mice exhibits a reduction in mineral-to-matrix ratio and in crystal size as shown by Raman spectroscopy and small-angle X-ray scattering, respectively. Importantly, abnormalities in bone quality were associated with impaired bone biomechanical strength in mutant femurs compared with those of wild-type littermates. Taken together, these data suggest that the altered collagen crosslinking through Fkbp10 ablation in osteoblasts primarily leads to a qualitative defect in the skeleton. © 2017 American Society for Bone and Mineral Research.
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Affiliation(s)
- Caressa D Lietman
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Joohyun Lim
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Ingo Grafe
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Yuqing Chen
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Hao Ding
- Department of Nanomedicine and Biomedical Engineering, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Xiaohong Bi
- Department of Nanomedicine and Biomedical Engineering, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Catherine G Ambrose
- Department of Orthopaedic Surgery, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Nadja Fratzl-Zelman
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - Paul Roschger
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling 1st Med. Dept. Hanusch Hospital, Vienna, Austria
| | - Wolfgang Wagermaier
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Potsdam, Germany
| | - Ingo Schmidt
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Potsdam, Germany
| | - Peter Fratzl
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Potsdam, Germany
| | - Jyoti Rai
- Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
| | - MaryAnn Weis
- Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
| | - David Eyre
- Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
| | - Douglas R Keene
- Micro-Imaging Center, Shriners Hospital for Children, Portland, OR, USA
| | - Deborah Krakow
- Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Brendan H Lee
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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