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Álvarez-Fernández N, Martínez Cortizas A, López-Costas O. Structural equation modelling of mercury intra-skeletal variability on archaeological human remains. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158015. [PMID: 35970463 DOI: 10.1016/j.scitotenv.2022.158015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 08/02/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Archaeological burial environments are useful archives to investigate the long-term trends and the behaviour of mercury. In order to understand the relationship between mercury, skeletons and soil, we applied Partial Least Squares - Structural Equation Modelling (PLS-SEM) to a detailed, multisampling (n = 73 bone samples +37 soil samples) design of two archaeological graves dating to the 6th to 7th centuries CE (A Lanzada site, NW Spain). Mercury content was assessed using a DMA-80, and data about bone structure and the grave soil/sediments were obtained using FTIR-ATR spectroscopy. The theoretical model is supported by proxies of bone structure, grave soil/sediments, and location of the bone within the skeleton. The general model explained 61 % of mercury variance. Additionally, Partial Least Square - Prediction Oriented Segmentation (PLS-POS) was also used to check for segmentation in the dataset. POS revealed two group of samples depending on the bone phase (hydroxyapatite or collagen) controlling the Hg content, and the corresponding models explained 86 % and 76 % of Hg variance, respectively. The results suggest that mercury behaviour in the graves is complex, and that mercury concentrations were influenced by i) the ante-mortem status of the bone matrix, related to the weight of each bone phase; ii) post-mortem evolution of bone crystallinity, where bone loses mercury with increasing alteration; and iii) the proximity of the skeletal pieces to mercury target organs, as decomposition and collapse of the thoracic and abdominal soft tissues causes a secondary mercury enrichment in bones from the body trunk during early post-mortem. Skeletons provide a source of mercury to the soil whereas soil/sediments contribute little to skeletal mercury content.
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Affiliation(s)
- Noemi Álvarez-Fernández
- CRETUS, EcoPast (GI-1553), Facultade de Bioloxía, Universidade de Santiago de Compostela, 16782, Spain; Boscalia Technologies S.L., Spain.
| | - Antonio Martínez Cortizas
- CRETUS, EcoPast (GI-1553), Facultade de Bioloxía, Universidade de Santiago de Compostela, 16782, Spain; Bolin Centre for Climate Research, Stockholm University, Stockholm SE-10691, Sweden
| | - Olalla López-Costas
- EcoPast (GI-1553), CRETUS, Area of Archaeology, Department of History, Universidade de Santiago de Compostela, 15782, Spain; Archaeological Research Laboratory, Stockholm University, Wallenberglaboratoriet, SE-10691, Sweden; Laboratorio de Antropología Física, Facultad de Medicina, Universidad de Granada, 18012, Spain
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2
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Gamsjaeger S, Rauch F, Glorieux FH, Paschalis EP. Cortical bone material / compositional properties in growing children and young adults aged 1.5-23 years, as a function of gender, age, metabolic activity, and growth spurt. Bone 2022; 165:116548. [PMID: 36122648 DOI: 10.1016/j.bone.2022.116548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/22/2022] [Accepted: 09/13/2022] [Indexed: 11/02/2022]
Abstract
Bone material / compositional properties are significant determinants of bone quality, thus strength. Raman spectroscopic analysis provides information on the quantity and quality of all three bone tissue components (mineral, organic matrix, and tissue water). The overwhelming majority of the published reports on the subject concern adults. We have previously reported on these properties in growing children and young adults, in the cancellous compartment. The purpose of the present study was to create normative reference data of bone material / compositional properties for children and young adults, in the cortical compartment. We performed Raman (Senterra (Bruker Optik GmbH), 50× objective, with an excitation of 785 nm (100 mW) and a lateral resolution of ~0.6 μm) microspectroscopic analysis of transiliac bone samples from 54 individuals between 1.5 and 23 years of age, with no known metabolic bone disease, and which have been previously used to establish histomorphometric, bone mineralization density distribution, and cancellous bone quality reference values. The bone quality indices that were determined were: mineral/matrix ratio (MM) from the integrated areas of the v2PO4 (410-460 cm-1) and the amide III (1215-1300 cm-1) bands, tissue water in nanopores approximated by the ratio of the integrated spectral area ~ 494-509 cm-1 to Amide III band, the glycosaminoglycan (GAG) content (ratio of integrated area 1365-1390 cm-1 to the Amide III band, the sulfated proteoglycan (sPG) content as the ratio of the integrated peaks ~1062 cm-1 and 1365-1390 cm-1, the pyridinoline (Pyd) content estimated from the ratio of the absorbance height at 1660 cm-1 / area of the amide I (1620-1700 cm-1) band, and the mineral maturity / crystallinity (MMC) estimated from the inverse of the full width at half height of the v1PO4 (930-980 cm-1) band. Analyses were performed at the three distinct cortical surfaces (endosteal, osteonal, periosteal) at specific anatomical microlocations, namely the osteoid, and the three precisely known tissue ages based on the presence of fluorescence double labels. Measurements were also taken in interstitial bone, a much older tissue that has undergone extensive secondary mineralization. Overall, significant dependencies of the measured parameters on tissue age were observed, while at any given tissue age, sex and subject age were minimal confounders. The established Raman database in the cortical compartments complements the previously published one in cancellous bone, and provides healthy baseline bone quality indices that may serve as a valuable tool to identify alterations due to pediatric disease.
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Affiliation(s)
- S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - F Rauch
- Shriners Hospitals for Children and McGill University, Montreal, QC H4A 0A9, Canada
| | - F H Glorieux
- Shriners Hospitals for Children and McGill University, Montreal, QC H4A 0A9, Canada
| | - E P Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria.
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3
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Paschalis EP, Gamsjaeger S, Klaushofer K, Shane E, Cohen A, Stepan J, Pavo I, Eriksen EF, Taylor KA, Dempster DW. Treatment of postmenopausal osteoporosis patients with teriparatide for 24 months reverts forming bone quality indices to premenopausal healthy control values. Bone 2022; 162:116478. [PMID: 35779845 DOI: 10.1016/j.bone.2022.116478] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 11/25/2022]
Abstract
Postmenopausal osteoporosis (PMOP) therapies are frequently evaluated by bone mineral density (BMD) gains against patients receiving placebo (calcium and vitamin D supplementation, a mild bone turnover-suppressing intervention), which is not equivalent to either healthy or treatment-naive PMOP. The aim of the present observational study was to assess the effects of TPTD treatment in PMOP (20 μg, once daily) at 6 (TPTD 6m; n = 28, age 65 ± 7.3 years), and 24 (TPTD 24m; n = 32, age 67.4 ± 6.15 years) months on bone quality indices at actively forming trabecular surfaces (with fluorescent double labels). Data from the TPTD-treated PMOP patients were compared with those in healthy adult premenopausal women (HC; n = 62, age 40.5 ± 10.6 years), and PMOP receiving placebo (PMOP-PLC; n = 94, age 70.6 ± 4.5 years). Iliac crest biopsies were analyzed by Raman microspectroscopy at three distinct tissue ages: mid-distance between the second label and the bone surface, mid-distance between the two labels, and 1 μm behind the first label. Mineral to matrix ratio (MM), mineral maturity/crystallinity (MMC), tissue water (TW), glycosaminoglycan (GAGs), and pyridinoline (Pyd) content were determined. Outcomes were compared by ANCOVA with subject age and tissue age as covariates, and health status as a fixed factor, followed by Sidak's post-hoc testing (significance assigned to p < 0.05). Both TPTD groups increased MM compared to PMOP-PLC. While TPTD 6m had values similar to HC, TPTD 24m had higher values compared to either HC or TPTD 6m. Both TPTD groups had lower MMC values compared to PMOP-PLC and similar to HC. TPTD 6m patients had higher TW content compared to HC, while TPTD 24m had values similar to HC and lower than either PMOP-PLC or TPTD 6m. Both TPTD groups had lower GAG content compared to HC group, while TPTD 6m had higher values compared to PMOP-PLC. Finally, TPTD 6m patients had higher Pyd content compared to HC and lower compared to PMOP-PLC, while TPTD 24m had lower values compared to PMOP-PLC and TPTD 6m, and similar to HC group. The results of the present study indicate that effects of TPTD on forming trabecular bone quality indices depend on treatment duration. At the recommended length of 24 m, TPTD restores bone mineral and organic matrix quality indices (MMC, TW, Pyd content) to premenopausal healthy (HC) levels.
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Affiliation(s)
- Eleftherios P Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria.
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Elizabeth Shane
- Division of Endocrinology, Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA
| | - Adi Cohen
- Early Onset Osteoporosis Center, Metabolic Bone Diseases Program, Division of Endocrinology, Department of Medicine, Columbia University, College of Physicians & Surgeons, New York, NY, USA
| | - Jan Stepan
- Institute of Rheumatology, Faculty of Medicine 1, Charles University, Prague, Czech Republic
| | - Imre Pavo
- Eli Lilly and Company USA, LLC, Indianapolis, IN, USA
| | - Erik F Eriksen
- Department of Endocrinology, Pilestredet Park Specialist Center, Oslo, Norway; The Faculty of Dentistry, University of Oslo, Oslo, Norway
| | | | - David W Dempster
- Regional Bone Center, Helen Hayes Hospital, New York State Department of Health, West Haverstraw, NY, USA; Department of Pathology and Cell Biology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
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Mandair GS, Bigelow EMR, Viswanathan G, Ward FS, Patton DM, Schlecht SH, Jepsen KJ, Kohn DH. Region-specific associations among tissue-level mechanical properties, porosity, and composition in human male femora. J Biomech 2022; 139:111144. [PMID: 35623287 DOI: 10.1016/j.jbiomech.2022.111144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 11/25/2022]
Abstract
Region-specific differences in age-related bone remodeling are known to exist. We therefore hypothesized that the decline in tissue-level strength and post-yield strain (PYS) with age is not uniform within the femur, but is driven by region-specific differences in porosity and composition. Four-point bending was conducted on anterior, posterior, medial, and lateral beams from male cadaveric femora (n = 33, 18-89 yrs of age). Mid-cortical porosity, composition, and mineralization were assessed using nano-computed tomography (nanoCT), Raman spectroscopy, and ashing assays. Traits between bones from young and elderly groups were compared, while multivariate analyses were used to identify traits that predicted strength and PYS at the regional level. We show that age-related decline in porosity and mechanical properties varied regionally, with highest positive slope of age vs. Log(porosity) found in posterior and anterior bone, and steepest negative slopes of age vs. strength and age vs. PYS found in anterior bone. Multivariate analyses show that Log(porosity) and/or Raman 1246/1269 ratio explained 46-51% of the variance in strength in anterior and posterior bone. Three out of five traits related to Log(porosity), mineral crystallinity, 1246/1269, mineral/matrix ratio, and/or hydroxyproline/proline (Hyp/Pro) ratio, explained 35-50% of the variance in PYS in anterior, posterior and lateral bones. Log(porosity) and Hyp/Pro ratio alone explained 13% and 19% of the variance in strength and PYS in medial bone, respectively. The predictive performance of multivariate analyses was negatively impacted by pooling data across all bone regions, underscoring the complexity of the femur and that the use of pooled analyses may obscure underlying region-specific differences.
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Affiliation(s)
- Gurjit S Mandair
- Biological and Material Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Erin M R Bigelow
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Gowri Viswanathan
- Biological and Material Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Ferrous S Ward
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA; Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Daniella M Patton
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA; Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Stephen H Schlecht
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA; Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Karl J Jepsen
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA; Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - David H Kohn
- Biological and Material Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA; Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.
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5
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Pedrosa M, Ferreira MT, E Batista de Carvalho LA, M Marques MP, Curate F. The association of osteochemometrics and bone mineral density in humans. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2021; 176:434-444. [PMID: 33852736 DOI: 10.1002/ajpa.24283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/12/2021] [Accepted: 03/24/2021] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Even though much is known about bone mineral and matrix composition, studies about their relationship with several bone properties and its alterations related to bone diseases such as osteoporosis are practically non-existent in humans. Thus, the development of methods to understand the effects of bone properties at a microscopic level is paramount. This research aimed to evaluate whether Fourier transform infrared-attenuated total reflectance (FTIR-ATR) band intensity ratios correlate with femoral bone mass, bone mineral content (BMC) (total and femoral neck), bone mineral per unit area (BMD) (total, femoral neck, greater trochanter, intertrochanteric region, and Ward's area) and the area (total and femoral neck). A sample of femora from the 21st Century Identified Skeleton Collection (N = 78, 42 females and 36 males) was employed and BMC, BMD, and the femoral areas were acquired by DXA. RESULTS It was found that only females' BMD had a significant association with the femoral FTIR-ATR indices under study, whereas bone collagen (Am/P) and the content of carbonate Type A (API) in males correlated with the total proximal femur area of the regions of interest and the femoral neck area. DISCUSSION Men and women showed different changes related to their chemical composition in BMD, BMC, and probed area, most likely due to differences in structure and physiology, as well as mechanical strength in the proximal femoral sites where BMD was analyzed.
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Affiliation(s)
- Mariana Pedrosa
- Centre for Functional Ecology, Laboratory of Forensic Anthropology, Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Molecular Physical-Chemistry R&D Unit, Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | - Maria Teresa Ferreira
- Centre for Functional Ecology, Laboratory of Forensic Anthropology, Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Research Centre for Anthropology and Health, Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal
| | | | - Maria Paula M Marques
- Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Molecular Physical-Chemistry R&D Unit, Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | - Francisco Curate
- Centre for Functional Ecology, Laboratory of Forensic Anthropology, Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,Research Centre for Anthropology and Health, Department of Life Sciences, Calçada Martim de Freitas, University of Coimbra, Coimbra, Portugal.,School of Technology of Tomar, Polytechnic Institute of Tomar, Tomar, Portugal
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6
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Gamsjaeger S, Fratzl P, Paschalis EP. Interplay between mineral crystallinity and mineral accumulation in health and postmenopausal osteoporosis. Acta Biomater 2021; 124:374-381. [PMID: 33582361 DOI: 10.1016/j.actbio.2021.02.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 01/21/2023]
Abstract
Osteoporosis is characterized by an imbalance between bone formation and resorption rates, resulting in bone loss. For ethical reasons, effects of antiosteoporosis drugs are compared against patients receiving vitamin D and calcium supplementation which is a mild antiresorptive regimen. Bone formation may be resolved into two phases: the initial formation of mineral crystals (primary nucleation) and the subsequent mineral accumulation (secondary nucleation and mineral growth) on them. In this study, we used Raman microspectroscopic analysis of iliac crest biopsies from healthy females (N = 108), postmenopausal osteoporosis patients receiving vitamin D and calcium supplementation (PMOP-S; N = 66), and treatment-naïve postmenopausal osteoporosis patients (PMOP-TN; N = 12) to test the hypothesis that at forming trabecular surfaces, mineral maturity / crystallinity of the youngest crystallites associates with the amount of subsequent mineral accumulation. The surfaces of analysis were chosen based on the presence of fluorescent double labels, defining three distinct tissue ages. The results indicated that when adjusted for age and tissue age, there were no differences in amount of mineral formed between healthy females and either PMOP-S or PMOP-TN, while both PMOP-S and PMOP-TN had larger crystallites compared to healthy females. Moreover, significant differences existed between PMOP-S and PMOP-TN in size of initial crystals formed as well as rate of mineral accumulation and maturation. These findings suggest an additional mechanism that may contribute to the decreased mineral content evident in PMOP, and provide a potential target for the development of new interventions. STATEMENT OF SIGNIFICANCE: We used Raman microspectroscopic analysis of iliac crest biopsies from healthy females and postmenopausal osteoporosis patients (PMOP) receiving placebo to test the hypothesis that at forming trabecular surfaces, mineral maturity / crystallinity (MMC) of the youngest crystallites associates with the amount of subsequent mineral accumulation. This can affect bone mechanical properties as larger crystallites have been shown to result in compromised mechanical attributes; and larger crystallites grow slower compared to smaller ones. The results of the present analysis indicate that increased MMC of the youngest formed mineral may contribute to the bone mineral loss evident in PMOP and the accompanying increased fracture risk independently of bone turnover rate.
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Affiliation(s)
- S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, Vienna A-1140, Austria
| | - P Fratzl
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam 14476, Germany
| | - E P Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, Vienna A-1140, Austria.
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7
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Paschalis EP, Dempster DW, Gamsjaeger S, Rokidi S, Hassler N, Brozek W, Chan-Diehl FW, Klaushofer K, Taylor KA. Mineral and organic matrix composition at bone forming surfaces in postmenopausal women with osteoporosis treated with either teriparatide or zoledronic acid. Bone 2021; 145:115848. [PMID: 33453443 DOI: 10.1016/j.bone.2021.115848] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 01/05/2023]
Abstract
The ability of bone to resist fracture is dependent on the composite nature of its mineral and organic matrix content. Teriparatide (TPTD) and zoledronic acid (ZOL) are approved anabolic and antiresorptive therapies, respectively, to reduce fracture risk in women with postmenopausal osteoporosis. In the SHOTZ study, postmenopausal women with osteoporosis were treated with TPTD (20 μg daily, subcutaneous) or ZOL (5 mg/year, intravenous infusion) for 24 months. Iliac crest biopsies were obtained at 6 months and again at 24 months from approximately one third of the original study cohort. To investigate the early effects of these two drugs on the quality of newly formed bone, we used vibrational spectroscopic techniques to analyze tetracycline-labelled transiliac biopsies obtained from participants at the 6-month time point. Raman spectra were acquired at forming trabecular and intra-cortical surfaces (identified by fluorescent double labels), to determine mineral, organic matrix, glycosaminoglycan, and tissue water content, as well as mineral maturity/crystallinity at three specific tissue ages (1-5, 15, and ≥25 days). Fourier transformed infrared microspectroscopy was used to determine pyridinoline/divalent collagen cross-link ratios. At 6 months, treatment with TPTD versus ZOL resulted in lower mineral and higher organic matrix content, increased tissue water content, and lower mineral/matrix, mineral maturity/crystallinity, glycosaminoglycan content, and pyridinoline/divalent enzymatic collagen cross-link ratio. Our results suggest that TPTD and ZOL have differential effects on material properties of newly formed bone at individual remodeling sites, highlighting their different mechanisms of action.
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Affiliation(s)
- Eleftherios P Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - David W Dempster
- Regional Bone Center, Helen Hayes Hospital, New York State Department of Health, West Haverstraw, NY, USA; Department of Pathology and Cell Biology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Stamatia Rokidi
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Norbert Hassler
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Wolfgang Brozek
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | | | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
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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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Simfia I, Schiavi J, McNamara LM. ROCK-II inhibition suppresses impaired mechanobiological responses in early estrogen deficient osteoblasts. Exp Cell Res 2020; 396:112264. [PMID: 32898551 DOI: 10.1016/j.yexcr.2020.112264] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 08/27/2020] [Accepted: 08/30/2020] [Indexed: 12/22/2022]
Abstract
Mechanobiological responses by osteoblasts are governed by downstream Rho-ROCK signalling through actin cytoskeleton re-arrangements but whether these responses are influenced by estrogen deficiency during osteoporosis remains unknown. The objective of this study was to determine alterations in the mechanobiological responses of estrogen-deficient osteoblasts and investigate whether an inhibitor of the Rho-ROCK signalling can revert these changes. MC3T3-E1 cells were pre-treated with 10 nM 17-β estradiol for 7 days and further cultured with or without estradiol for next 2 days. These cells were treated with or without ROCK-II inhibitor, Y-27632, and oscillatory fluid flow (OFF, 1Pa, 0.5 Hz, 1 h) was applied. Here, we report that Prostaglandin E2 release, Runt-related transcription factor 2 and Osteopontin gene expression were significantly enhanced in response to OFF in estrogen-deficient cells than in cells with estrogen (3.73 vs 1.63 pg/ng DNA; 13.5 vs 2.6 fold, 2.1 vs 0.4 fold respectively). Upon ROCK-II inhibition, these enhanced effects of estrogen deficiency were downregulated. OFF increased the fibril anisotropy in cells pre-treated with estrogen and this increase was suppressed upon ROCK-II inhibition. This study is the first to demonstrate altered mechanobiological responses by osteoblasts during early estrogen deficiency and that these responses to OFF can be suppressed upon ROCK inhibition.
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Affiliation(s)
- Irene Simfia
- Mechanobiology and Medical Device Research Group, Biomechanics Research Centre, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway, Ireland
| | - Jessica Schiavi
- Mechanobiology and Medical Device Research Group, Biomechanics Research Centre, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway, Ireland
| | - Laoise M McNamara
- Mechanobiology and Medical Device Research Group, Biomechanics Research Centre, Biomedical Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway, Ireland.
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10
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Rokidi S, Bravenboer N, Gamsjaeger S, Chavassieux P, Zwerina J, Paschalis E, Papapoulos S, Appelman-Dijkstra N. Impact microindentation measurements correlate with cortical bone material properties measured by Fourier transform infrared imaging in humans. Bone 2020; 137:115437. [PMID: 32473316 DOI: 10.1016/j.bone.2020.115437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 04/28/2020] [Accepted: 05/15/2020] [Indexed: 11/27/2022]
Abstract
Bone Material Strength index (BMSi) measured by Impact Microindentation is generally lower in subjects with fragility fractures independently of BMD values. We recently reported that in humans, BMSi values are strongly associated with material properties of subperiosteal mineralized bone surface (local mineral content, nanoporosity, pyridinoline content). In the present study we investigated the relationship of BMSi with material properties of the whole bone cortex, by analyzing thin sections of iliac crest biopsies (N = 12) from patients with different skeletal disorders and a wide range of BMD with or without fractures, by Fourier transform infrared imaging (FTIRI). The calculated parameters were: i) mineral and organic matrix content and their ratio (MM), ii) mineral maturity/crystallinity (MMC) and iii) the ratio of pyridinoline (Pyd) and divalent collagen cross-links (XLR). Results were expressed as images, which were converted to histogram distributions. For each histogram the characteristics recorded were: mean value, mode (most often occurring value), skewness, and kurtosis and their association with BMSi values was examined by correlation analysis. BMSi values were significantly correlated only with MM mean and mode values (r = 0.736, p = 0.0063, and r = 0.855, p = 0.0004, respectively), and with XLR mode values (r = -0.632, p = 0.0274). The results of the present study demonstrate that BMSi values are strongly associated with MM, a metric that corrects the mineral content for the organic matrix content, and may also depend on organic matrix quality. These and our previous observations strongly suggest that BMSi assesses material properties of cortical bone.
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Affiliation(s)
- Stamatia Rokidi
- Ludwig Boltzmann Institute of Osteology at 1st Medical Department, Hanusch Hospital of Österreichische Gesundheitskasse (ÖGK) and Research Funds of the Austrian Workers Compensation Board (AUVA) Trauma Centre Meidling, Vienna, Austria
| | - Natalie Bravenboer
- Leiden Center for Bone Quality, Leiden University Medical Center, Leiden, the Netherlands
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at 1st Medical Department, Hanusch Hospital of Österreichische Gesundheitskasse (ÖGK) and Research Funds of the Austrian Workers Compensation Board (AUVA) Trauma Centre Meidling, Vienna, Austria
| | | | - Jochen Zwerina
- Ludwig Boltzmann Institute of Osteology at 1st Medical Department, Hanusch Hospital of Österreichische Gesundheitskasse (ÖGK) and Research Funds of the Austrian Workers Compensation Board (AUVA) Trauma Centre Meidling, Vienna, Austria
| | - Eleftherios Paschalis
- Ludwig Boltzmann Institute of Osteology at 1st Medical Department, Hanusch Hospital of Österreichische Gesundheitskasse (ÖGK) and Research Funds of the Austrian Workers Compensation Board (AUVA) Trauma Centre Meidling, Vienna, Austria.
| | - Socrates Papapoulos
- Leiden Center for Bone Quality, Leiden University Medical Center, Leiden, the Netherlands
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Assessment of Renal Osteodystrophy via Computational Analysis of Label-free Raman Detection of Multiple Biomarkers. Diagnostics (Basel) 2020; 10:diagnostics10020079. [PMID: 32023980 PMCID: PMC7168928 DOI: 10.3390/diagnostics10020079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 01/27/2020] [Accepted: 01/29/2020] [Indexed: 01/19/2023] Open
Abstract
Accurate clinical evaluation of renal osteodystrophy (ROD) is currently accomplished using invasive in vivo transiliac bone biopsy, followed by in vitro histomorphometry. In this study, we demonstrate that an alternative method for ROD assessment is through a fast, label-free Raman recording of multiple biomarkers combined with computational analysis for predicting the minimally required number of spectra for sample classification at defined accuracies. Four clinically relevant biomarkers: the mineral-to-matrix ratio, the carbonate-to-matrix ratio, phenylalanine, and calcium contents were experimentally determined and simultaneously considered as input to a linear discriminant analysis (LDA). Additionally, sample evaluation was performed with a linear support vector machine (LSVM) algorithm, with a 300 variable input. The computed probabilities based on a single spectrum were only marginally different (~80% from LDA and ~87% from LSVM), both providing an unacceptable classification power for a correct sample assignment. However, the Type I and Type II assignment errors confirm that a relatively small number of independent spectra (7 spectra for Type I and 5 spectra for Type II) is necessary for a p < 0.05 error probability. This low number of spectra supports the practicality of future in vivo Raman translation for a fast and accurate ROD detection in clinical settings.
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12
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Abstract
The main clinical tool for the diagnosis and treatment of skeletal diseases such as osteoporosis is the determination of bone mineral density by dual x-ray absorptiometry. Although this outcome contributes to the determination of bone strength, the clinical evidence to date suggests that it does not correlate strongly with fracture incidence. The main reason for this discrepancy is the fact that several other bone properties, such as material properties, are not taken into account. This short review summarizes the reasons why material properties are important in the determination of bone strength and briefly discusses some of them as well as their influence on bone’s mechanical performance.
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Affiliation(s)
- 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, Vienna, 1140, 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, Vienna, 1140, Austria
| | - Markus A Hartmann
- 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, Vienna, 1140, Austria
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13
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Formation of stable strontium-rich amorphous calcium phosphate: Possible effects on bone mineral. Acta Biomater 2019; 92:315-324. [PMID: 31125726 DOI: 10.1016/j.actbio.2019.05.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/21/2019] [Accepted: 05/13/2019] [Indexed: 01/10/2023]
Abstract
Bone, tooth enamel, and dentin accumulate Sr2+, a natural trace element in the human body. Sr2+ comes from dietary and environmental sources and is thought to play a key role in osteoporosis treatments. However, the underlying impacts of Sr2+on bone mineralization remain unclear and the use of synthetic apatites (which are structurally different from bone mineral) and non-physiological conditions have led to contradictory results. Here, we report on the formation of a new Sr2+-rich and stable amorphous calcium phosphate phase, Sr(ACP). Relying on a bioinspired pathway, a series of Sr2+ substituted hydroxyapatite (HA) that combines the major bone mineral features is depicted as model to investigate how this phase forms and Sr2+ affects bone. In addition, by means of a comprehensive investigation the biomineralization pathway of Sr2+ bearing HA is described showing that not more than 10 at% of Sr2+, i.e. a physiological limit incorporated in bone, can be incorporated into HA without phase segregation. A combination of 31P and 1H solid state NMR, energy electron loss spectromicroscopy, transmission electron microscopy, electron diffraction, and Raman spectroscopy shows that Sr2+ introduces disorder in the HA culminating with the unexpected Sr(ACP), which co-exists with the HA under physiological conditions. These results suggest that heterogeneous Sr2+ distribution in bone is associated with regions of low structural organization. Going further, such observations give clues from the physicochemical standpoint to understand the defects in bone formation induced by high Sr2+ doses. STATEMENT OF SIGNIFICANCE: Understanding the role played by Sr2+ has a relevant impact in physiological biomineralization and provides insights for its use as osteoporosis treatments. Previous studies inspired by the bone remodelling pathway led to the formation of biomimetic HA in terms of composition, structures and properties in water. Herein, by investigating different atomic percentage of Sr2+ related to Ca2+ in the synthesis, we demonstrate that 10% of Sr2+ is the critical loads into the biomimetic HA phase; similarly to bone. Unexpectedly, using higher amount leads to the formation of a stable Sr2+-rich amorphous calcium phosphate phase that may high-dose related pathologies. Our results provide further understanding of the different ways Sr2+ impacts bone.
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14
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Klontzas ME, Reakasame S, Silva R, Morais JC, Vernardis S, MacFarlane RJ, Heliotis M, Tsiridis E, Panoskaltsis N, Boccaccini AR, Mantalaris A. Oxidized alginate hydrogels with the GHK peptide enhance cord blood mesenchymal stem cell osteogenesis: A paradigm for metabolomics-based evaluation of biomaterial design. Acta Biomater 2019; 88:224-240. [PMID: 30772514 DOI: 10.1016/j.actbio.2019.02.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 02/08/2019] [Accepted: 02/13/2019] [Indexed: 02/06/2023]
Abstract
Oxidized alginate hydrogels are appealing alternatives to natural alginate due to their favourable biodegradability profiles and capacity to self-crosslink with amine containing molecules facilitating functionalization with extracellular matrix cues, which enable modulation of stem cell fate, achieve highly viable 3-D cultures, and promote cell growth. Stem cell metabolism is at the core of cellular fate (proliferation, differentiation, death) and metabolomics provides global metabolic signatures representative of cellular status, being able to accurately identify the quality of stem cell differentiation. Herein, umbilical cord blood mesenchymal stem cells (UCB MSCs) were encapsulated in novel oxidized alginate hydrogels functionalized with the glycine-histidine-lysine (GHK) peptide and differentiated towards the osteoblastic lineage. The ADA-GHK hydrogels significantly improved osteogenic differentiation compared to gelatin-containing control hydrogels, as demonstrated by gene expression, alkaline phosphatase activity and bone extracellular matrix deposition. Metabolomics revealed the high degree of metabolic heterogeneity in the gelatin-containing control hydrogels, captured the enhanced osteogenic differentiation in the ADA-GHK hydrogels, confirmed the similar metabolism between differentiated cells and primary osteoblasts, and elucidated the metabolic mechanism responsible for the function of GHK. Our results suggest a novel paradigm for metabolomics-guided biomaterial design and robust stem cell bioprocessing. STATEMENT OF SIGNIFICANCE: Producing high quality engineered bone grafts is important for the treatment of critical sized bone defects. Robust and sensitive techniques are required for quality assessment of tissue-engineered constructs, which result to the selection of optimal biomaterials for bone graft development. Herein, we present a new use of metabolomics signatures in guiding the development of novel oxidised alginate-based hydrogels with umbilical cord blood mesenchymal stem cells and the glycine-histidine-lysine peptide, demonstrating that GHK induces stem cell osteogenic differentiation. Metabolomics signatures captured the enhanced osteogenesis in GHK hydrogels, confirmed the metabolic similarity between differentiated cells and primary osteoblasts, and elucidated the metabolic mechanism responsible for the function of GHK. In conclusion, our results suggest a new paradigm of metabolomics-driven design of biomaterials.
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Abstract
It is well known that bone loss accompanies aging in both men and women and contributes to skeletal fragility in the older population, but changes that occur to the bone tissue matrix itself are less well known. These changes in bone quality aggravate the skeletal fragility associated with loss of bone mass. Bone tissue quality is affected by age-related changes in bone mineral, collagen and its cross-linking profiles, water compartments and even non-collagenous proteins. It is commonly assumed that greater tissue mineralization accompanies aging as bone turnover slows down in elderly individuals, but the data for this are weak. However, there may be changes in the quality of the mineral crystals, and the substitutions found within the crystal. Both enzymatically-mediated and non-enzymatically-mediated collagen cross-links multiply with age. The former tend to make the bone stiffer and stronger, but the latter, while making the bone stiffer can also make it more brittle and more likely to fracture. Bone pore water that is not bound to collagen or mineral increases with age as bone mass is lost, but water that is bound to collagen and mineral declines with age. These changes contribute to skeletal fragility by reducing the amount that bone can deform before fracturing. Finally, non-collagenous proteins have physical properties that can alter matrix mechanical properties and can also have molecular signaling functions that regulate bone remodeling. Whether these change with age, how they change, and how this affects skeletal fragility with aging is still largely a black box, and requires much more investigation. The roles of any of these factors in skeletal fragility are difficult to assess clinically as there is no easy or economical way to evaluate them, but a picture of fragility in the aging skeleton is incomplete without them.
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Affiliation(s)
- David B Burr
- Dept. of Anatomy and Cell Biology, Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, United States of America; Dept. of Biomedical Engineering, Indiana University-Purdue University, Indianapolis (IUPUI), United States of America.
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Fourier Transform Infrared Spectroscopy of Bone Tissue: Bone Quality Assessment in Preclinical and Clinical Applications of Osteoporosis and Fragility Fracture. Clin Rev Bone Miner Metab 2019. [DOI: 10.1007/s12018-018-9255-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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17
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Paolillo FR, Romano RA, de Matos L, Martin AA, Guimarães FEG, de Castro Neto JC, Bagnato VS. Short-term and long-term effects of osteoporosis on incisor teeth and femoral bones evaluated by Raman spectroscopy and energy dispersive X-ray analysis in ovariectomized rats. J Bone Miner Metab 2019; 37:18-27. [PMID: 29344812 DOI: 10.1007/s00774-018-0903-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 01/04/2018] [Indexed: 01/05/2023]
Abstract
There are few published data on the relationship between loss of bone mass due to osteoporosis and poor tooth quality. This study analyzed the effects of osteoporosis on incisor teeth and femoral bones using optical techniques in rats. Twenty female Wistar rats aged 6 months (n = 20) were randomized into two groups: control group, non-ovariectomized rats (n = 10); ovariectomy group, ovariectomized rats to induce osteoporosis (n = 10). Each group was subdivided randomly into two groups containing five rats each as follows. Control group 1: non-ovariectomized rats euthanized at the age of 9 or 3 months post-ovariectomy (n = 5); Control group 2: non-ovariectomized rats euthanized at the age of 1 year or 6 months post-ovariectomy (n = 5); ovariectomy group 1: ovariectomized rats euthanized at the age of 9 months or 3 months post-ovariectomy (n = 5); ovariectomy group 2: ovariectomized rats euthanized at the age of 1 year or 6 months post-ovariectomy (n = 5). The incisor teeth and femoral bones of Wistar rats were removed to perform Raman spectroscopy using an excitation laser at 785 nm. In addition, an energy-dispersive X-ray spectrometer system was used to evaluate calcium (Ca) and phosphorus (P). The main findings included significant changes (p < 0.05) for phosphate and carbonate band areas for both incisor teeth and femur bones. In addition, there was significant negative correlation between the P concentration and phosphate/carbonate ratio (lower P content-larger ratio, p < 0.05) for incisor teeth and femoral bones. The proline and CH2 wag band areas were significantly reduced only for the incisor teeth (p < 0.05). Therefore, Raman spectroscopy assessed the compositional, physicochemical and structural changes in hard tissue. The current study also pointed out the possible action mechanisms of these changes, bone fracture risk and dental fragility. It is important to emphasize that poor dental quality may also occur due to osteoporosis.
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Affiliation(s)
- Fernanda Rossi Paolillo
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil.
| | - Renan Arnon Romano
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Luciana de Matos
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Airton Abrahão Martin
- Department of Physics from Federal University of Piauí (UFPI), Campus Universitário Ministro Petrônio Portella, Bairro Ininga, Teresina, Bairro Ininga, Teresina, PI 64049-550, Brazil
- Department of Biomedical Engineering from Brazil University (UnBr), Rua Carolina Fonseca, 584, Itaquera, SP, Brazil
| | - Francisco Eduardo Gontijo Guimarães
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Jarbas Caiado de Castro Neto
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Vanderlei Salvador Bagnato
- Optics Group from São Carlos Institute of Physics (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400, Centro, São Carlos, SP, CEP 13560-970, Brazil
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18
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Abstract
Fourier transform infrared imaging (FTIRI) is a technique that can be used to analyze the material properties of bone using tissue sections. This chapter describes the basic principles of FTIR and the methods for capturing and analyzing FTIR images in bone sections.
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19
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Greenwood C, Clement J, Dicken A, Evans P, Lyburn I, Martin RM, Stone N, Zioupos P, Rogers K. Age-Related Changes in Femoral Head Trabecular Microarchitecture. Aging Dis 2018; 9:976-987. [PMID: 30574411 PMCID: PMC6284768 DOI: 10.14336/ad.2018.0124] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 01/24/2018] [Indexed: 11/20/2022] Open
Abstract
Osteoporosis is a prevalent bone condition, characterised by low bone mineral density and increased fracture risk. Currently, the gold standard for identifying osteoporosis and increased fracture risk is through quantification of bone mineral density using dual energy X-ray absorption. However, many studies have shown that bone strength, and consequently the probability of fracture, is a combination of both bone mass and bone 'quality' (architecture and material chemistry). Although the microarchitecture of both non-fracture and osteoporotic bone has been previously investigated, many of the osteoporotic studies are constrained by factors such as limited sample number, use of ovariectomised animal models, and lack of male and female discrimination. This study reports significant differences in bone quality with respect to the microarchitecture between fractured and non-fractured human femur specimens. Micro-computed tomography was utilised to investigate the microarchitecture of femoral head trabecular bone from a relatively large cohort of non-fracture and fracture human donors. Various microarchitectural parameters have been determined for both groups, providing an understanding of the differences between fracture and non -fracture material. The microarchitecture of non-fracture and fracture bone tissue is shown to be significantly different for many parameters. Differences between sexes also exist, suggesting differences in remodelling between males and females in the fracture group. The results from this study will, in the future, be applied to develop a fracture model which encompasses bone density, architecture and material chemical properties for both female and male tissues.
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Affiliation(s)
| | - John Clement
- Melbourne Dental School, University of Melbourne, Melbourne, Australia.
| | - Anthony Dicken
- The Imaging Science Group, Nottingham Trent University, Nottingham, UK.
| | - Paul Evans
- The Imaging Science Group, Nottingham Trent University, Nottingham, UK.
| | | | | | - Nick Stone
- Physics and Astronomy, Exeter University, Exeter, UK.
| | - Peter Zioupos
- Cranfield Forensic Institute, Cranfield University, Shrivenham, UK.
| | - Keith Rogers
- Cranfield Forensic Institute, Cranfield University, Shrivenham, UK.
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20
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Plazanet M, Tasseva J, Bartolini P, Taschin A, Torre R, Combes C, Rey C, Di Michele A, Verezhak M, Gourrier A. Time-domain THz spectroscopy of the characteristics of hydroxyapatite provides a signature of heating in bone tissue. PLoS One 2018; 13:e0201745. [PMID: 30138314 PMCID: PMC6107136 DOI: 10.1371/journal.pone.0201745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 07/20/2018] [Indexed: 11/19/2022] Open
Abstract
Because of the importance of bone in the biomedical, forensic and archaeological contexts, new investigation techniques are constantly required to better characterize bone ultrastructure. In the present paper, we provide an extended investigation of the vibrational features of bone tissue in the 0.1-3 THz frequency range by time-domain THz spectroscopy. Their assignment is supported by a combination of X-ray diffraction and DFT-normal modes calculations. We investigate the effect of heating on bone tissue and synthetic calcium-phosphates compounds with close structure and composition to bone mineral, including stoichiometric and non-stoichiometric hydroxyapatite (HA), tricalcium phosphate, calcium pyrophosphate and tetracalcium phosphate. We thus demonstrate that the narrow vibrational mode at 2.1 THz in bone samples exposed to thermal treatment above 750 °C arises from a lattice mode of stoichiometric HA. This feature is also observed in the other synthetic compounds, although weaker or broader, but is completely smeared out in the non-stoichiometric HA, close to natural bone mineral composition, or in synthetic poorly crystalline HA powder. The THz spectral range therefore provides a clear signature of the crystalline state of the investigated bone tissue and could, therefore be used to monitor or identify structural transitions occurring in bone upon heating.
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Affiliation(s)
- Marie Plazanet
- Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France
- Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Perugia, Italy
- * E-mail: (MP); (AG)
| | - Jordanka Tasseva
- European Laboratory for Non-Linear Spectroscopy (LENS) and Dip. di Fisica ed Astronomia, Università di Firenze, Sesto Fiorentino, Italy
| | - Paolo Bartolini
- European Laboratory for Non-Linear Spectroscopy (LENS) and Dip. di Fisica ed Astronomia, Università di Firenze, Sesto Fiorentino, Italy
| | - Andrea Taschin
- European Laboratory for Non-Linear Spectroscopy (LENS) and Dip. di Fisica ed Astronomia, Università di Firenze, Sesto Fiorentino, Italy
| | - Renato Torre
- European Laboratory for Non-Linear Spectroscopy (LENS) and Dip. di Fisica ed Astronomia, Università di Firenze, Sesto Fiorentino, Italy
| | - Christèle Combes
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | - Christian Rey
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | - Alessandro Di Michele
- Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Perugia, Italy
| | | | - Aurelien Gourrier
- Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France
- * E-mail: (MP); (AG)
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21
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Choi S, Friedrichs J, Song YH, Werner C, Estroff LA, Fischbach C. Intrafibrillar, bone-mimetic collagen mineralization regulates breast cancer cell adhesion and migration. Biomaterials 2018; 198:95-106. [PMID: 29759731 DOI: 10.1016/j.biomaterials.2018.05.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/27/2018] [Accepted: 05/01/2018] [Indexed: 10/17/2022]
Abstract
Bone metastasis is a leading cause of death in patients with breast cancer, but the underlying mechanisms are poorly understood. While much work focuses on the molecular and cellular events that drive breast cancer bone metastasis, it is mostly unclear what role bone extracellular matrix (ECM) properties play in this process. Bone ECM primarily consists of mineralized collagen fibrils, which are composed of non-stoichiometric carbonated apatite (HA) and collagen type I. Reduced bone mineral content is epidemiologically linked with increased risk of bone metastasis. Yet elucidating the potential functional impact of collagen mineralization on breast cancer cells has remained challenging because of a lack of model systems that allow studying tumor cell behavior as a function of physiological, intrafibrillar collagen mineralization. Here, we have developed cell culture substrates composed of mineralized collagen type I fibrils using a polymer-induced liquid-precursor (PILP) process. Intrafibrillar HA decreased breast cancer cell adhesion forces and accordingly reduced collagen fiber alignment relative to cells cultured on control collagen. The resulting mineral-mediated changes in collagen network characteristics and mechanosignaling correlated with increased cell motility, but inhibited directed migration of breast cancer cells. These results suggest that physiological mineralization of collagen fibrils reduces tumor cell adhesion with potential functional consequences on skeletal homing of disseminated tumor cells in early stages of breast cancer metastasis.
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Affiliation(s)
- Siyoung Choi
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Jens Friedrichs
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | - Young Hye Song
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Carsten Werner
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | - Lara A Estroff
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA.
| | - Claudia Fischbach
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA.
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22
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Ciubuc JD, Manciu M, Maran A, Yaszemski MJ, Sundin EM, Bennet KE, Manciu FS. Raman Spectroscopic and Microscopic Analysis for Monitoring Renal Osteodystrophy Signatures. BIOSENSORS-BASEL 2018; 8:bios8020038. [PMID: 29642494 PMCID: PMC6022865 DOI: 10.3390/bios8020038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 03/24/2018] [Accepted: 04/02/2018] [Indexed: 01/01/2023]
Abstract
Defining the pathogenesis of renal osteodystrophy (ROD) and its treatment efficacy are difficult, since many factors potentially affect bone quality. In this study, confocal Raman microscopy and parallel statistical analysis were used to identify differences in bone composition between healthy and ROD bone tissues through direct visualization of three main compositional parametric ratios, namely, calcium content, mineral-to-matrix, and carbonate-to-matrix. Besides the substantially lower values found in ROD specimens for these representative ratios, an obvious accumulation of phenylalanine is Raman spectroscopically observed for the first time in ROD samples and reported here. Thus, elevated phenylalanine could also be considered as an indicator of the disease. Since the image results are based on tens of thousands of spectra per sample, not only are the average ratios statistically significantly different for normal and ROD bone, but the method is clearly powerful in distinguishing between the two types of samples. Furthermore, the statistical outcomes demonstrate that only a relatively small number of spectra need to be recorded in order to classify the samples. This work thus opens the possibility of future development of in vivo Raman sensors for assessment of bone structure, remodeling, and mineralization, where different biomarkers are simultaneously detected with unprecedented accuracy.
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Affiliation(s)
- John D Ciubuc
- Department of Physics, University of Texas at El Paso, El Paso, TX 79968, USA.
- Department of Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Marian Manciu
- Department of Physics, University of Texas at El Paso, El Paso, TX 79968, USA.
- Border Biomedical Research Center, University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Avudaiappan Maran
- Department of Orthopedic Surgery and Biomaterials and Histomorphometry Core Laboratory, Mayo Clinic, Rochester, MN 55905, USA.
| | - Michael J Yaszemski
- Department of Orthopedic Surgery and Biomaterials and Histomorphometry Core Laboratory, Mayo Clinic, Rochester, MN 55905, USA.
| | - Emma M Sundin
- Department of Physics, University of Texas at El Paso, El Paso, TX 79968, USA.
- Department of Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Kevin E Bennet
- Division of Engineering, Department of Neurologic Surgery, Mayo Clinic, Rochester, MN 55905, USA.
| | - Felicia S Manciu
- Department of Physics, University of Texas at El Paso, El Paso, TX 79968, USA.
- Department of Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA.
- Border Biomedical Research Center, University of Texas at El Paso, El Paso, TX 79968, 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: 71] [Impact Index Per Article: 11.8] [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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24
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Paschalis EP, Gamsjaeger S, Klaushofer K. Vibrational spectroscopic techniques to assess bone quality. Osteoporos Int 2017; 28:2275-2291. [PMID: 28378291 DOI: 10.1007/s00198-017-4019-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 03/27/2017] [Indexed: 12/18/2022]
Abstract
Although musculoskeletal diseases such as osteoporosis are diagnosed and treatment outcome is evaluated based mainly on routine clinical outcomes of bone mineral density (BMD) by DXA and biochemical markers, it is recognized that these two indicators, as valuable as they have proven to be in the everyday clinical practice, do not fully account for manifested bone strength. Thus, the term bone quality was introduced, to complement considerations based on bone turnover rates and BMD. Bone quality is an "umbrella" term that incorporates the structural and material/compositional characteristics of bone tissue. Vibrational spectroscopic techniques such as Fourier transform infrared microspectroscopy (FTIRM) and imaging (FTIRI), and Raman spectroscopy, are suitable analytical tools for the determination of bone quality as they provide simultaneous, quantitative, and qualitative information on all main bone tissue components (mineral, organic matrix, tissue water), in a spatially resolved manner. Moreover, the results of such analyses may be readily combined with the outcomes of other techniques such as histology/histomorphometry, small angle X-ray scattering, quantitative backscattered electron imaging, and nanoindentation.
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Affiliation(s)
- E 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 Str. 30, 1140, Vienna, Austria.
| | - S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, 1140, Vienna, Austria
| | - K Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, 1140, Vienna, Austria
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25
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Rosa JAD, Sakane KK, Santos KCP, Corrêa VB, Arana-Chavez VE, Oliveira JXD. Strontium Ranelate Effect on the Repair of Bone Defects and Molecular Components of the Cortical Bone of Rats. Braz Dent J 2017; 27:502-507. [PMID: 27982225 DOI: 10.1590/0103-6440201600693] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 05/24/2016] [Indexed: 01/28/2023] Open
Abstract
This study was conducted to evaluate the effects of treatment with strontium ranelate (SR) on the repair of bone defects and molecular components of bones in femurs. Adult female rats (n=27) were subjected to ovariectomy (OVX) or Sham surgery. Thirty days after surgery, a defect was made in the femur and the animals were then divided into three groups: OVX, SHAM and OVX+SR. Euthanasia was performed four weeks after the bone defect surgery. Repair in bone defect was assessed by computed microtomography (μCT) and chemical composition of cortical bone was analyzed by Fourier transform infrared (FTIR) spectroscopy and energy dispersive X-ray spectroscopy (EDS). The trabecular thickness (Tb.Th) of the newly formed bone in the OVX+SR group was significantly higher than that for the OVX group. The collagen maturity in the OVX+SR group was smaller than in the other two groups. In this group, a significant increase in the amount of strontium (Sr) and a decrease in the amount of calcium (Ca) embedded to bone tissue were also observed. Systemic treatment with SR improved microarchitecture of the newly formed bone inside the defect, but decreased cross-linking of mature collagen in cortical bone.
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Affiliation(s)
- Jucely Aparecida da Rosa
- Department of Stomatology, Dental School, USP - Universidade de São Paulo, São Paulo, SP, Brazil
| | - Kumiko Koibuchi Sakane
- Institute for Research and Development, UNIVAP - Universidade do Vale do Paraíba, SP, Brazil
| | | | | | - Victor Elias Arana-Chavez
- Department of Biomaterials and Oral Biology, Dental School, USP - Universidade de São Paulo, São Paulo, SP, Brazil
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26
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Aguado E, Mabilleau G, Goyenvalle E, Chappard D. Hypodynamia Alters Bone Quality and Trabecular Microarchitecture. Calcif Tissue Int 2017; 100:332-340. [PMID: 28160025 DOI: 10.1007/s00223-017-0235-x] [Citation(s) in RCA: 15] [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: 09/06/2016] [Accepted: 01/07/2017] [Indexed: 01/06/2023]
Abstract
Disuse induces a rapid bone loss in humans and animals; hypodynamia/sedentarity is now recognized as a risk factor for osteoporosis. Hypodynamia also decreases bone mass but its effects are largely unknown and only few animal models have been described. Hypodynamic chicken is recognized as a suitable model of bone loss but the effects on the quality have not been fully explored. We have used ten chickens bred in a large enclosure (FREE group); ten others were confined in small cages with little space to move around (HYPO group). They were sacrificed at 53 days and femurs were evaluated by microcomputed tomography (microCT) and nanoindentation. Sections (4 µm thick) were analyzed by Fourier Transform InfraRed Microspectroscopy (FTIR) to see the effects on mineralization and collagen and quantitative backscattered electron imaging (qBEI) to image the mineral of the bone matrix. Trabecular bone volume and microarchitecture were significantly altered in the HYPO group. FTIR showed a significant reduction of the mineral-to-matrix ratio in the HYPO group associated with an increase in the carbonate content and an increase in crystallinity (calculated as the area ratio of subbands located at 1020 and 1030 cm-1) indicating a poor quality of the mineral. Collagen maturity (calculated as the area ratio of subbands located at 1660 and 1690 cm-1) was significantly reduced in the HYPO group. Reduced biomechanical properties were observed at the tissue level. Confined chicken represents a new model for the study of hypodynamia because bone changes are not created by a surgical lesion or a traumatic method. Animals have a reduced bone mass and present with an altered bone matrix quality which is less mineralized and whose collagen contains less crosslinks than in control chicken.
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Affiliation(s)
- Eric Aguado
- ONIRIS, Ecole Nationale Vétérinaire, route de Gachet, 44307, Nantes Cedex 3, France
- GEROM Groupe Etudes Remodelage Osseux et bioMatériaux, IRIS-IBS Institut de Biologie en Santé, CHU d'Angers, Université d'Angers, 49933, ANGERS Cedex, France
| | - Guillaume Mabilleau
- GEROM Groupe Etudes Remodelage Osseux et bioMatériaux, IRIS-IBS Institut de Biologie en Santé, CHU d'Angers, Université d'Angers, 49933, ANGERS Cedex, France
| | - Eric Goyenvalle
- ONIRIS, Ecole Nationale Vétérinaire, route de Gachet, 44307, Nantes Cedex 3, France
- GEROM Groupe Etudes Remodelage Osseux et bioMatériaux, IRIS-IBS Institut de Biologie en Santé, CHU d'Angers, Université d'Angers, 49933, ANGERS Cedex, France
| | - Daniel Chappard
- GEROM Groupe Etudes Remodelage Osseux et bioMatériaux, IRIS-IBS Institut de Biologie en Santé, CHU d'Angers, Université d'Angers, 49933, ANGERS Cedex, France.
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27
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Paschalis EP, Gamsjaeger S, Hassler N, Klaushofer K, Burr D. Ovarian hormone depletion affects cortical bone quality differently on different skeletal envelopes. Bone 2017; 95:55-64. [PMID: 27826024 DOI: 10.1016/j.bone.2016.10.029] [Citation(s) in RCA: 19] [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: 05/18/2016] [Revised: 10/17/2016] [Accepted: 10/25/2016] [Indexed: 12/31/2022]
Abstract
The physical properties of bone tissue are determined by the organic and mineral matrix, and are one aspect of bone quality. As such, the properties of mineral and matrix are a major contributor to bone strength, independent of bone mass. Cortical bone quality may differ regionally on the three skeletal envelopes that compose it. Each of these envelopes may be affected differently by ovarian hormone depletion. Identifying how these regions vary in their tissue adaptive response to ovarian hormones can inform our understanding of how tissue quality contributes to overall bone strength in postmenopausal women. We analyzed humeri from monkeys that were either SHAM-operated or ovariectomized. Raman microspectroscopic analysis was performed as a function of tissue age based on the presence of multiple fluorescent double labels, to determine whether bone compositional properties (mineral/matrix ratio, tissue water, glycosaminoglycan, lipid, and pyridinoline contents, and mineral maturity/crystallinity) are similar between periosteal, osteonal, and endosteal surfaces, as well as to determine the effects of ovarian hormone depletion on them. The results indicate that mineral and organic matrix characteristics, and kinetics of mineral and organic matrix modifications as a function of tissue age are different at periosteal vs. osteonal and endosteal surfaces. Ovarian hormone depletion affects the three cortical surfaces (periosteal, osteonal, endosteal) differently. While ovarian hormone depletion does not significantly affect the quality of either the osteoid or the most recently mineralized tissue, it significantly affects the rate of subsequent mineral accumulation, as well as the kinetics of organic matrix modifications, culminating in significant differences within interstitial bone. These results highlight the complexity of the cortical bone compartments, add to existing knowledge on the effects of ovarian hormone depletion on local cortical bone properties, and may contribute to a better understanding of the location specific action of drugs used in the management of postmenopausal osteoporosis.
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Affiliation(s)
- E 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 Str. 30, A-1140 Vienna, Austria.
| | - S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - N Hassler
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - K Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - D Burr
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Department of Biomedical Engineering, Indiana University-Purdue University, Indianapolis (IUPUI), Indianapolis, IN 46202, USA
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28
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Paschalis EP, Gamsjaeger S, Hassler N, Fahrleitner-Pammer A, Dobnig H, Stepan JJ, Pavo I, Eriksen EF, Klaushofer K. Vitamin D and calcium supplementation for three years in postmenopausal osteoporosis significantly alters bone mineral and organic matrix quality. Bone 2017; 95:41-46. [PMID: 27826025 DOI: 10.1016/j.bone.2016.11.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 10/30/2016] [Accepted: 11/02/2016] [Indexed: 12/15/2022]
Abstract
Prospective, controlled clinical trials in postmenopausal osteoporosis typically compare effects of an active drug with placebo in addition to vitamin D and calcium supplementation in both treatment arms. While clinical benefits are documented, the effect of this supplementation in the placebo arm and in clinical practice on bone material composition properties is unknown. The purpose of the present study was to evaluate these bone quality indices (specifically mineral/matrix, nanoporosity, glycosaminoglycan content, mineral maturity/crystallinity, and pyridinoline content) in patients that either received long-term vitamin D (400-1200IU) and calcium (1.0-1.5g) supplementation, or did not. We have analyzed by Raman microspectroscopy the bone forming trabecular surfaces of iliac crest in pre-treatment samples of a teriparatide study and the endpoint biopsies of the control arm obtained from the HORIZON trial. In general, the mineral/matrix ratio and the glycosaminoglycan (GAG) content was higher while nanoporosity, (a surrogate for tissue water content), the mineral maturity/crystallinity (MMC) and the pyridinoline (Pyd) content was lower in patients without long-term supplementation. Moreover, all indices were significantly dependent on tissue age. In conclusion, vitamin D and calcium supplementation is associated with altered mineral and organic matrix properties.
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Affiliation(s)
- E P Paschalis
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140, Vienna, Austria.
| | - S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140, Vienna, Austria
| | - N Hassler
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140, Vienna, Austria
| | | | - H Dobnig
- Thyroid, Endocrinology, and Osteoporosis Institute, Graz, Austria
| | - J J Stepan
- Institute of Rheumatology, Faculty of Medicine 1, Charles University, Prague, Czech Republic
| | - I Pavo
- Endocrinology Dept., Oslo University Hospital, Norway
| | - E F Eriksen
- Endocrinology Dept., Oslo University Hospital, Norway
| | - K Klaushofer
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140, Vienna, Austria
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29
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Sa Y, Guo Y, Feng X, Wang M, Li P, Gao Y, Yang X, Jiang T. Are different crystallinity-index-calculating methods of hydroxyapatite efficient and consistent? NEW J CHEM 2017. [DOI: 10.1039/c7nj00803a] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Different CI-calculating methods of XRD, FTIR and Raman techniques showed high efficiency and consistency.
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Affiliation(s)
- Yue Sa
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Yaru Guo
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Xiaowei Feng
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Man Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Ping Li
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Yixue Gao
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
| | - Xu Yang
- Department of Oral Biology
- School of Dental Medicine
- University of Pittsburgh
- Pittsburgh
- USA
| | - Tao Jiang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education
- School & Hospital of Stomatology
- Wuhan University
- Wuhan 430079
- P. R. China
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30
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Pentosidine as a Biomarker for Poor Bone Quality and Elevated Fracture Risk. BIOMARKERS IN BONE DISEASE 2017. [DOI: 10.1007/978-94-007-7693-7_32] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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31
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Vrahnas C, Pearson TA, Brunt AR, Forwood MR, Bambery KR, Tobin MJ, Martin TJ, Sims NA. Anabolic action of parathyroid hormone (PTH) does not compromise bone matrix mineral composition or maturation. Bone 2016; 93:146-154. [PMID: 27686599 DOI: 10.1016/j.bone.2016.09.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 09/23/2016] [Accepted: 09/25/2016] [Indexed: 02/04/2023]
Abstract
Intermittent administration of parathyroid hormone (PTH) is used to stimulate bone formation in patients with osteoporosis. A reduction in the degree of matrix mineralisation has been reported during treatment, which may reflect either production of undermineralised matrix or a greater proportion of new matrix within the bone samples assessed. To explore these alternatives, high resolution synchrotron-based Fourier Transform Infrared Microspectroscopy (sFTIRM) coupled with calcein labelling was used in a region of non-remodelling cortical bone to determine bone composition during anabolic PTH treatment compared with region-matched samples from controls. 8week old male C57BL/6 mice were treated with vehicle or 50μg/kg PTH, 5 times/week for 4weeks (n=7-9/group). Histomorphometry confirmed greater trabecular and periosteal bone formation and 3-point bending tests confirmed greater femoral strength in PTH-treated mice. Dual calcein labels were used to match bone regions by time-since-mineralisation (bone age) and composition was measured by sFTIRM in six 15μm2 regions at increasing depth perpendicular to the most immature bone on the medial periosteal edge; this allowed in situ measurement of progressive changes in bone matrix during its maturation. The sFTIRM method was validated in vehicle-treated bones where the expected progressive increases in mineral:matrix ratio and collagen crosslink type ratio were detected with increasing bone maturity. We also observed a gradual increase in carbonate content that strongly correlated with an increase in longitudinal stretch of the collagen triple helix (amide I:amide II ratio). PTH treatment did not alter the progressive changes in any of these parameters from the periosteal edge through to the more mature bone. These data provide new information about how the bone matrix matures in situ and confirm that bone deposited during PTH treatment undergoes normal collagen maturation and normal mineral accrual.
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Affiliation(s)
- Christina Vrahnas
- St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia; The University of Melbourne, Department of Medicine at St. Vincent's Hospital, Fitzroy, Victoria, Australia
| | - Thomas A Pearson
- St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia; The University of Melbourne, Department of Medicine at St. Vincent's Hospital, Fitzroy, Victoria, Australia
| | - Athena R Brunt
- School of Medical Science, Griffith University, Gold Coast, Queensland, Australia
| | - Mark R Forwood
- School of Medical Science, Griffith University, Gold Coast, Queensland, Australia
| | | | - Mark J Tobin
- Australian Synchrotron, Clayton, Victoria, Australia
| | - T John Martin
- St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia; The University of Melbourne, Department of Medicine at St. Vincent's Hospital, Fitzroy, Victoria, Australia
| | - Natalie A Sims
- St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia; The University of Melbourne, Department of Medicine at St. Vincent's Hospital, Fitzroy, Victoria, Australia.
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32
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Honkanen JTJ, Turunen MJ, Freedman JD, Saarakkala S, Grinstaff MW, Ylärinne JH, Jurvelin JS, Töyräs J. Cationic Contrast Agent Diffusion Differs Between Cartilage and Meniscus. Ann Biomed Eng 2016; 44:2913-2921. [PMID: 27129372 PMCID: PMC5042996 DOI: 10.1007/s10439-016-1629-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 04/22/2016] [Indexed: 12/31/2022]
Abstract
Contrast enhanced computed tomography (CECT) is a non-destructive imaging technique used for the assessment of composition and structure of articular cartilage and meniscus. Due to structural and compositional differences between these tissues, diffusion and distribution of contrast agents may differ in cartilage and meniscus. The aim of this study is to determine the diffusion kinematics of a novel iodine based cationic contrast agent (CA(2+)) in cartilage and meniscus. Cylindrical cartilage and meniscus samples (d = 6 mm, h ≈ 2 mm) were harvested from healthy bovine knee joints (n = 10), immersed in isotonic cationic contrast agent (20 mgI/mL), and imaged using a micro-CT scanner at 26 time points up to 48 h. Subsequently, normalized X-ray attenuation and contrast agent diffusion flux, as well as water, collagen and proteoglycan (PG) contents in the tissues were determined. The contrast agent distributions within cartilage and meniscus were different. In addition, the normalized attenuation and diffusion flux were higher (p < 0.05) in cartilage. Based on these results, diffusion kinematics vary between cartilage and meniscus. These tissue specific variations can affect the interpretation of CECT images and should be considered when cartilage and meniscus are assessed simultaneously.
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Affiliation(s)
- Juuso T. J. Honkanen
- Department of Applied Physics, University of Eastern Finland, POB 1627, 70211 Kuopio, Finland
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Mikael J. Turunen
- Department of Applied Physics, University of Eastern Finland, POB 1627, 70211 Kuopio, Finland
| | - Jonathan D. Freedman
- Department of Pharmacology, Boston University School of Medicine, Boston, MA USA
| | - Simo Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland
- Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
- Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Mark W. Grinstaff
- Department of Biomedical Engineering, Boston University, Boston, MA USA
- Department of Chemistry, Boston University, Boston, MA USA
| | - Janne H. Ylärinne
- Department of Integrative Medical Biology, University of Umea, Umeå, Sweden
| | - Jukka S. Jurvelin
- Department of Applied Physics, University of Eastern Finland, POB 1627, 70211 Kuopio, Finland
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Juha Töyräs
- Department of Applied Physics, University of Eastern Finland, POB 1627, 70211 Kuopio, Finland
- Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
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Abstract
Bone is a complex hierarchical structure, and its principal function is to resist mechanical forces and fracture. Bone strength depends not only on the quantity of bone tissue but also on the shape and hierarchical structure. The hierarchical levels are interrelated, especially the micro-architecture, collagen and mineral components; hence, analysis of their specific roles in bone strength and stiffness is difficult. Synchrotron imaging technologies including micro-CT and small/wide angle X-ray scattering/diffraction are becoming increasingly popular for studying bone because the images can resolve deformations in the micro-architecture and collagen-mineral matrix under in situ mechanical loading. Synchrotron cannot be directly applied in vivo due to the high radiation dose but will allow researchers to carry out systematic multifaceted studies of bone ex vivo. Identifying characteristics of aging and disease will underpin future efforts to generate novel devices and interventional therapies for assessing and promoting healthy aging. With our own research work as examples, this paper introduces how synchrotron imaging technology can be used with in situ testing in bone research.
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Affiliation(s)
- Shaocheng Ma
- Department of Mechanical Engineering, Faculty of Engineering, Imperial College London, London, SW7 2AZ UK
- MSk Laboratory, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, W6 8PR UK
| | - Oliver Boughton
- MSk Laboratory, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, W6 8PR UK
| | - Angelo Karunaratne
- Department of Mechanical Engineering, Faculty of Engineering, University of Moratuwa, Moratuwa, 10400 Sri Lanka
| | - Andi Jin
- Department of Mechanical Engineering, Faculty of Engineering, Imperial College London, London, SW7 2AZ UK
- MSk Laboratory, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, W6 8PR UK
| | - Justin Cobb
- MSk Laboratory, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, W6 8PR UK
| | - Ulrich Hansen
- Department of Mechanical Engineering, Faculty of Engineering, Imperial College London, London, SW7 2AZ UK
| | - Richard Abel
- MSk Laboratory, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, W6 8PR UK
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Zheng CM, Zheng JQ, Wu CC, Lu CL, Shyu JF, Yung-Ho H, Wu MY, Chiu IJ, Wang YH, Lin YF, Lu KC. Bone loss in chronic kidney disease: Quantity or quality? Bone 2016; 87:57-70. [PMID: 27049042 DOI: 10.1016/j.bone.2016.03.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 03/18/2016] [Accepted: 03/28/2016] [Indexed: 02/07/2023]
Abstract
Chronic kidney disease (CKD) patients experience bone loss and fracture because of a specific CKD-related systemic disorder known as CKD-mineral bone disorder (CKD-MBD). The bone turnover, mineralization, and volume (TMV) system describes the morphological bone lesions in renal osteodystrophy related to CKD-MBD. Bone turnover and bone volume are defined as high, normal, or low, and bone mineralization is classified as normal or abnormal. All types of bone histology related to TMV are responsible for both bone quantity and bone quality losses in CKD patients. This review focuses on current bone quantity and bone quality losses in CKD patients and finally discusses potential therapeutic measures.
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Affiliation(s)
- Cai-Mei Zheng
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan
| | - Jin-Quan Zheng
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan; Division of Pulmonary and Critical Care, Department of Critical Care Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan
| | - Chia-Chao Wu
- Division of Nephrology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Chien-Lin Lu
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan
| | - Jia-Fwu Shyu
- Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
| | - Hsu Yung-Ho
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan
| | - Mei-Yi Wu
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taiwan
| | - I-Jen Chiu
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan
| | - Yuan-Hung Wang
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan; Department of Medical Research, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
| | - Yuh-Feng Lin
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan
| | - Kuo-Cheng Lu
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taiwan; Division of Nephrology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Division of Nephrology, Department of Medicine, Cardinal-Tien Hospital, School of Medicine, Fu-Jen Catholic University, New Taipei City,Taiwan.
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Paschalis EP, Fratzl P, Gamsjaeger S, Hassler N, Brozek W, Eriksen EF, Rauch F, Glorieux FH, Shane E, Dempster D, Cohen A, Recker R, Klaushofer K. Aging Versus Postmenopausal Osteoporosis: Bone Composition and Maturation Kinetics at Actively-Forming Trabecular Surfaces of Female Subjects Aged 1 to 84 Years. J Bone Miner Res 2016; 31:347-57. [PMID: 26308158 DOI: 10.1002/jbmr.2696] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 08/10/2015] [Accepted: 08/22/2015] [Indexed: 11/11/2022]
Abstract
Bone strength depends on the amount of bone, typically expressed as bone mineral density (BMD), determined by dual-energy X-ray absorptiometry (DXA), and on bone quality. Bone quality is a multifactorial entity including bone structural and material compositional properties. The purpose of the present study was to examine whether bone material composition properties at actively-forming trabecular bone surfaces in health are dependent on subject age, and to contrast them with postmenopausal osteoporosis patients. To achieve this, we analyzed by Raman microspectroscopy iliac crest biopsy samples from healthy subjects aged 1.5 to 45.7 years, paired biopsy samples from females before and immediately after menopause aged 46.7 to 53.6 years, and biopsy samples from placebo-treated postmenopausal osteoporotic patients aged 66 to 84 years. The monitored parameters were as follows: the mineral/matrix ratio; the mineral maturity/crystallinity (MMC); nanoporosity; the glycosaminoglycan (GAG) content; the lipid content; and the pyridinoline (Pyd) content. The results indicate that these bone quality parameters in healthy, actively-forming trabecular bone surfaces are dependent on subject age at constant tissue age, suggesting that with advancing age the kinetics of maturation (either accumulation, or posttranslational modifications, or both) change. For most parameters, the extrapolation of models fitted to the individual age dependence of bone in healthy individuals was in rough agreement with their values in postmenopausal osteoporotic patients, except for MMC, lipid, and Pyd content. Among these three, Pyd content showed the greatest deviation between healthy aging and disease, highlighting its potential to be used as a discriminating factor.
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Affiliation(s)
- Eleftherios P Paschalis
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK), Vienna, Austria.,Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Peter Fratzl
- Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK), Vienna, Austria.,Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Norbert Hassler
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK), Vienna, Austria.,Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Wolfgang Brozek
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK), Vienna, Austria.,Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
| | - Erik F Eriksen
- Dept. of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Aker, Norway
| | - Frank Rauch
- Genetics Unit, Shriners Hospital for Children and McGill University, Montreal, QC, Canada
| | - Francis H Glorieux
- Genetics Unit, Shriners Hospital for Children and McGill University, Montreal, QC, Canada
| | - Elizabeth Shane
- Medicine and Pathology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
| | - David Dempster
- Medicine and Pathology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
| | - Adi Cohen
- Medicine and Pathology, College of Physicians and Surgeons of Columbia University, New York, NY, USA
| | - Robert Recker
- Osteoporosis Research Center, Creighton University, Omaha, NE, USA
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK), Vienna, Austria.,Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
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36
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Mathavan N, Turunen MJ, Tägil M, Isaksson H. Characterising bone material composition and structure in the ovariectomized (OVX) rat model of osteoporosis. Calcif Tissue Int 2015; 97:134-44. [PMID: 25894067 DOI: 10.1007/s00223-015-9991-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 03/25/2015] [Indexed: 01/14/2023]
Abstract
The ovariectomized (OVX) rat model is well established in investigations of osteoporosis and osteoporotic therapies. Advent of techniques such as Fourier-transform infrared (FTIR) spectroscopy and small angle X-ray scattering (SAXS) facilitate characterization of bone composition and mineral structure, respectively, which are key determinants of bone strength. Limited publications exist on the implementation of these techniques in the OVX rat model. At 12 weeks of age, female Sprague-Dawley rats were either sham-operated (n = 6) or ovariectomized (n = 6) and sacrificed 18 weeks later. L2 lumbar vertebrae and proximal tibiae were assessed by µCT, FTIR and SAXS. Presence of extensive trabecular deterioration in the µCT data confirmed the onset of osteoporosis. FTIR compositional parameters were determined including measures of degree of mineralization, crystallinity, collagen maturity and acid phosphate content. Mineral crystal thickness was determined from the SAXS data using two approaches available in literature. Compositionally, a decline in the heterogeneity of acid phosphate content was observed while measures of crystallinity and collagen maturity remained unaltered. Using an iterative curve fitting method, OVX-induced increases in the mineral crystal thickness of 3.8 and 7.8 % (p < 0.05) were noted in the trabecular of the vertebra and tibia, respectively. In conclusion, implementation of FTIR and SAXS techniques in the OVX rat model, identified no significant compositional changes while substantiating thickening of the mineral crystals as a general structural feature of OVX-induced osteoporosis in rats.
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Affiliation(s)
- Neashan Mathavan
- Department of Biomedical Engineering, Lund University, PO Box 118, 221 00, Lund, Sweden,
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Buckley K, Kerns JG, Vinton J, Gikas PD, Smith C, Parker AW, Matousek P, Goodship AE. Towards the in vivo prediction of fragility fractures with Raman spectroscopy. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2015; 46:610-618. [PMID: 27546955 PMCID: PMC4976623 DOI: 10.1002/jrs.4706] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/20/2015] [Accepted: 03/24/2015] [Indexed: 05/05/2023]
Abstract
Fragility fractures, those fractures which result from low level trauma, have a large and growing socio-economic cost in countries with aging populations. Bone-density-based assessment techniques are vital for identifying populations that are at higher risk of fracture, but do not have high sensitivity when it comes to identifying individuals who will go on to have their first fragility fracture. We are developing Spatially Offset Raman Spectroscopy (SORS) as a tool for retrieving chemical information from bone non-invasively in vivo. Unlike X-ray-based techniques SORS can retrieve chemical information from both the mineral and protein phases of the bone. This may enable better discrimination between those who will or will not go on to have a fragility fracture because both phases contribute to bone's mechanical properties. In this study we analyse excised bone with Raman spectroscopy and multivariate analysis, and then attempt to look for similar Raman signals in vivo using SORS. We show in the excised work that on average, bone fragments from the necks of fractured femora are more mineralised (by 5-10%) than (cadaveric) non-fractured controls, but the mineralisation distributions of the two cohorts are largely overlapped. In our in vivo measurements, we observe similar, but as yet statistically underpowered, differences. After the SORS data (the first SORS measurements reported of healthy and diseased human cohorts), we identify methodological developments which will be used to improve the statistical significance of future experiments and may eventually lead to more sensitive prediction of fragility fractures. © 2015 The Authors. Journal of Raman Spectroscopy Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Kevin Buckley
- Central Laser Facility, Research Complex at HarwellSTFC Rutherford Appleton LaboratoryHarwell OxfordOX11 0FAUK
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
- Royal National Orthopaedic HospitalStanmoreHA7 4LPUK
| | - Jemma G. Kerns
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
- Royal National Orthopaedic HospitalStanmoreHA7 4LPUK
| | | | - Panagiotis D. Gikas
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
- Royal National Orthopaedic HospitalStanmoreHA7 4LPUK
| | - Christian Smith
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
| | - Anthony W. Parker
- Central Laser Facility, Research Complex at HarwellSTFC Rutherford Appleton LaboratoryHarwell OxfordOX11 0FAUK
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
- Royal National Orthopaedic HospitalStanmoreHA7 4LPUK
| | - Pavel Matousek
- Central Laser Facility, Research Complex at HarwellSTFC Rutherford Appleton LaboratoryHarwell OxfordOX11 0FAUK
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
- Royal National Orthopaedic HospitalStanmoreHA7 4LPUK
| | - Allen E. Goodship
- UCL Institute of Orthopaedics and Musculoskeletal ScienceLondonHA7 4LPUK
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Wen XX, Wang FQ, Xu C, Wu ZX, Zhang Y, Feng YF, Yan YB, Lei W. Time Related Changes of Mineral and Collagen and Their Roles in Cortical Bone Mechanics of Ovariectomized Rabbits. PLoS One 2015; 10:e0127973. [PMID: 26046792 PMCID: PMC4457815 DOI: 10.1371/journal.pone.0127973] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 04/21/2015] [Indexed: 12/30/2022] Open
Abstract
As cortical bone has a hierarchical structure, the macroscopic bone strength may be affected by the alterations of mineral crystal and collagen, which are main components of cortical bone. Limited studies focused on the time related alterations of these two components in osteoporosis, and their contributions to bone mechanics at tissue level and whole-bone level. Therefore, the purpose of this study was to elucidate the time related changes of mineral and collagen in cortical bone of ovariectomized (OVX) rabbits, and to relate these changes to cortical bone nanomechanics and macromechanics. 40 Rabbits (7-month-old) were randomly allocated into two groups (OVX and sham). OVX group received bilateral ovariectomy operation. Sham group received sham-OVX operation. Cortical bone quality of five rabbits in each group were assessed by DXA, μCT, nanoindentation, Fourier transform infrared (FTIR) spectroscopy and biomechanical tests (3-point bending of femoral midshaft) at pre-OVX, 4, 6, and 8 weeks after OVX. As time increased from pre-OVX to 8 weeks, the mineral to matrix ratio decreased with time, while both collagen crosslink ratio and crystallinity increased with time in OVX group. Elastic modulus and hardness measured by nanoindentation, whole-bone strength measured by biomechanical tests all decreased in OVX group with time. Bone material properties measured by FTIR correlated well with nano or whole-bone level mechanics. However, bone mineral density (BMD), structure, tissue-level and whole-bone mechanical properties did not change with age in sham group. Our study demonstrated that OVX could affect the tissue-level mechanics and bone strength of cortical bone. And this influence was attributed to the time related alterations of mineral and collagen properties, which may help us to design earlier interventions and more effective treatment strategies on osteoporosis.
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Affiliation(s)
- Xin-Xin Wen
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Fa-Qi Wang
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Chao Xu
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Zi-Xiang Wu
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yang Zhang
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Ya-Fei Feng
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Ya-Bo Yan
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Wei Lei
- Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Relationships between tissue composition and viscoelastic properties in human trabecular bone. J Biomech 2015; 48:269-75. [DOI: 10.1016/j.jbiomech.2014.11.034] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 11/21/2014] [Accepted: 11/24/2014] [Indexed: 01/22/2023]
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40
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Lloyd AA, Wang ZX, Donnelly E. Multiscale contribution of bone tissue material property heterogeneity to trabecular bone mechanical behavior. J Biomech Eng 2015; 137:1935360. [PMID: 25383615 PMCID: PMC4296240 DOI: 10.1115/1.4029046] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 11/05/2014] [Accepted: 11/12/2014] [Indexed: 11/08/2022]
Abstract
Heterogeneity of material properties is an important potential contributor to bone fracture resistance because of its putative contribution to toughness, but establishing the contribution of heterogeneity to fracture risk is still in an incipient stage. Experimental studies have demonstrated changes in distributions of compositional and nanomechanical properties with fragility fracture history, disease, and pharmacologic treatment. Computational studies have demonstrated that models with heterogeneous material properties predict apparent stiffness moderately better than homogeneous models and show greater energy dissipation. Collectively, these results suggest that microscale material heterogeneity affects not only microscale mechanics but also structural performance at larger length scales.
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Affiliation(s)
- Ashley A. Lloyd
- Department of Materials Scienceand Engineering,Cornell University,B60 Bard Hall,Ithaca, NY 14853e-mail:
| | - Zhen Xiang Wang
- Department of Materials Scienceand Engineering,Cornell University,B60 Bard Hall,Ithaca, NY 14853e-mail:
| | - Eve Donnelly
- Assistant ProfessorDepartment of Materials Scienceand Engineering,Cornell University,227 Bard Hall,Ithaca, NY 14853
- Hospital for Special Surgery,535 E. 70th Street,New York, NY 10021e-mail:
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Gamsjaeger S, Mendelsohn R, Boskey AL, Gourion-Arsiquaud S, Klaushofer K, Paschalis EP. Vibrational spectroscopic imaging for the evaluation of matrix and mineral chemistry. Curr Osteoporos Rep 2014; 12:454-64. [PMID: 25240579 PMCID: PMC4638121 DOI: 10.1007/s11914-014-0238-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Metabolic bone diseases manifesting fragility fractures (such as osteoporosis) are routinely diagnosed based on bone mineral density (BMD) measurements, and the effect of various therapies also evaluated based on the same outcome. Although useful, it is well recognized that this metric does not fully account for either fracture incidence or the effect of various therapies on fracture incidence, thus, the emergence of bone quality as a contributing factor in the determination of bone strength. Infrared and Raman vibrational spectroscopic techniques are particularly well-suited for the determination of bone quality as they provide quantitative and qualitative information of the mineral and organic matrix bone components, simultaneously. Through the use of microspectroscopic techniques, this information is available in a spatially resolved manner, thus, the outcomes may be easily correlated with outcomes from techniques such as histology, histomorphometry, and nanoindentation, linking metabolic status with material properties.
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Affiliation(s)
- S. Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital, of WGKK and AUVA Trauma Centre Meidling, 1st Medical, Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | | | | | | | - K. Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital, of WGKK and AUVA Trauma Centre Meidling, 1st Medical, Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - E. 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 Str. 30, A-1140 Vienna, Austria,
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Hofstetter B, Gamsjaeger S, Varga F, Dobnig H, Stepan JJ, Petto H, Pavo I, Klaushofer K, Paschalis EP. Bone quality of the newest bone formed after two years of teriparatide therapy in patients who were previously treatment-naïve or on long-term alendronate therapy. Osteoporos Int 2014; 25:2709-19. [PMID: 25037600 DOI: 10.1007/s00198-014-2814-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 07/04/2014] [Indexed: 01/06/2023]
Abstract
UNLABELLED The results of the present study, involving analysis of biopsies from patients who received teriparatide for 2 years and were previously either treatment-naïve or on long-term alendronate therapy, suggest that prior alendronate use does not blunt the favorable effects of teriparatide on bone quality. INTRODUCTION Examine the effect of 2 years of teriparatide (TPTD) treatment on mineral and organic matrix properties of the newest formed bone in patients who were previously treatment-naïve (TN) or on long-term alendronate (ALN) therapy. METHODS Raman and Fourier transform infrared microspectroscopic analyses were used to determine the mineral/matrix (M/M) ratio, the relative proteoglycan (PG) content, and the mineral maturity/crystallinity (MMC; determined by three methods: carbonate content, full width at half height of the v 1 PO4 band [FWHH], and wavelength at maxima of the v 1 PO4 band), as well as collagen maturity (ratio of pyridinoline/divalent cross-links), in paired iliac crest biopsies at trabecular, endosteal, and osteonal surfaces of newly formed bone in postmenopausal osteoporotic women who were previously either TN (n = 16) or receiving long-term ALN treatment (n = 24). RESULTS Trabecular M/M ratio increased and matrix content decreased significantly in the ALN pretreated group. Collagen maturity decreased in both patient groups. Endosteal M/M ratio increased significantly in the TN group. Trabecular M/M ratio was higher at endpoint in the ALN pretreated group than in the TN group. Overall, no changes from baseline were observed in PG content, except that PG content was higher in the ALN pretreated group than in the TN group at endosteal surfaces at endpoint. The ability of TPTD treatment to reduce MMC in both patient groups and at the different bone surfaces depended on the measurement tool (relative carbonate content or wavelength at maxima of the v 1 PO4 band). None of the changes in MMC were different between the two patient groups. CONCLUSIONS The results suggest some favorable impact of TPTD on bone mineral and organic matrix properties of in situ forming bone in terms of increased initial mineralization and decreased MMC and collagen maturity. Moreover, prior long-term ALN administration may have only limited influence on these properties in bone newly formed after 2 years of TPTD treatment.
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Affiliation(s)
- B Hofstetter
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK, AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
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43
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Gamsjaeger S, Hofstetter B, Fratzl-Zelman N, Roschger P, Roschger A, Fratzl P, Brozek W, Masic A, Misof BM, Glorieux FH, Klaushofer K, Rauch F, Paschalis EP. Pediatric reference Raman data for material characteristics of iliac trabecular bone. Bone 2014; 69:89-97. [PMID: 25245203 DOI: 10.1016/j.bone.2014.09.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 09/09/2014] [Accepted: 09/11/2014] [Indexed: 01/07/2023]
Abstract
Bone material characteristics are important contributors in the determination of bone strength. Raman spectroscopic analysis provides information on mineral/matrix ratio, mineral maturity/crystallinity, relative pyridinoline (Pyd) collagen cross-link content, relative proteoglycan content and relative lipid content. However, published reference data are available only for adults. The purpose of the present study was to establish reference data of Raman outcomes pertaining to bone quality in trabecular bone for children and young adults. To this end, tissue age defined Raman microspectroscopic analysis was performed on bone samples from 54 individuals between 1.5 and 23 years with no metabolic bone disease, which have been previously used to establish histomorphometric and bone mineralization density distribution reference values. Four distinct tissue ages, three well defined by the fluorescent double labels representing early stages of bone formation and tissue maturation (days 3, 12, 20 of tissue mineralization) and a fourth representing old mature tissue at the geometrical center of the trabeculae, were analyzed. In general, significant dependencies of the measured parameters on tissue age were found, while at any given tissue age, sex and subject age were not confounders. Specifically, mineral/matrix ratio, mineral maturity/crystallinity index and relative pyridinoline collagen cross-link content index increased by 485%, 20% and 14%, respectively between days 3 and 20. The relative proteoglycan content index was unchanged between days 3 and 20 but was elevated in the old tissue compared to young tissue by 121%. The relative lipid content decreased within days 3 to 20 by -22%. Thus, the method allows not only the monitoring of material characteristics at a specific tissue age but also the kinetics of tissue maturation as well. The established reference Raman database will serve as sensitive tool to diagnose disturbances in material characteristics of pediatric bone biopsy samples.
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Affiliation(s)
- S Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - B Hofstetter
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - N Fratzl-Zelman
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - P Roschger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - A Roschger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria; Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - P Fratzl
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - W Brozek
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - A Masic
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | - B M Misof
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - F H Glorieux
- Genetics Unit, Shriners Hospital for Children and McGill University, Montreal, Quebec H3G 1A6, Canada
| | - K Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria
| | - F Rauch
- Genetics Unit, Shriners Hospital for Children and McGill University, Montreal, Quebec H3G 1A6, Canada
| | - E 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 Str. 30, A-1140 Vienna, Austria.
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Gamsjaeger S, Srivastava AK, Wergedal JE, Zwerina J, Klaushofer K, Paschalis EP, Tatakis DN. Altered bone material properties in HLA-B27 rats include reduced mineral to matrix ratio and altered collagen cross-links. J Bone Miner Res 2014; 29:2382-91. [PMID: 24771481 DOI: 10.1002/jbmr.2268] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 04/22/2014] [Accepted: 04/23/2014] [Indexed: 01/17/2023]
Abstract
Spondyloarthropathy and inflammatory bowel disease (IBD), which includes ulcerative colitis and Crohn's disease, are often associated with severe osteopenia/osteoporosis in both children and adults. HLA-B27 transgenic rats present a phenotype that includes severe colitis and severely accelerated alveolar bone loss. The purpose of this study was to evaluate long bone density status, systemic bone metabolic markers, and intrinsic bone material properties in HLA-B27 transgenic (TG) rats, and compare them with those of age- and sex-matched wild-type (WT) animals. The results indicate that in the HLA-B27 rat, an animal susceptible to both alveolar bone loss (ABL) and long bone osteopenia, there is a statistically significant negative correlation between ABL and long bone bone mineral density (BMD), as well as mineral/matrix ratio at active bone-forming trabecular surfaces. The TG animals had a lower mineral/matrix ratio and higher relative proteoglycan and advanced glycation end product (ϵ-N-Carboxymethyl-L-lysine) content and pyridinoline/divalent collagen cross-link ratio compared with WT. These results may provide better understanding of the interrelationship between osteoporosis and oral bone loss, the underlying causes of the inferior bone strength in the HLA-B27 transgenic animals, and could prove to be a useful model in the elucidation of the pathophysiology of spondyloarthropathy and IBD-associated osteopenia/osteoporosis and in the evaluation of pharmacological intervention(s) against such conditions.
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Affiliation(s)
- Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
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45
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Hassler N, Roschger A, Gamsjaeger S, Kramer I, Lueger S, van Lierop A, Roschger P, Klaushofer K, Paschalis EP, Kneissel M, Papapoulos S. Sclerostin deficiency is linked to altered bone composition. J Bone Miner Res 2014; 29:2144-51. [PMID: 24753092 DOI: 10.1002/jbmr.2259] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 03/30/2014] [Accepted: 04/17/2014] [Indexed: 11/09/2022]
Abstract
High bone mass in animals and humans with sclerostin deficiency is associated with increased bone strength, which is not the case for all disorders with high bone mineral density, some of which are even associated with fragility fractures owing to unfavorable bone composition. In the current study we investigated whether alterations in bone composition may contribute to the bone strength characteristics associated with lack of sclerostin. We examined cortical bone of Sost-knockout (KO) mice (n = 9, 16 weeks old) and sclerosteosis patients (young [4 to 14 years], n = 4 and adults [24 and 43 years], n = 2) by quantitative backscattered electron imaging and Raman microspectroscopy and compared it to bone from wild-type mice and healthy subjects, respectively. In Sost-KO mice endocortical bone exhibited altered bone composition, whereas subperiosteal bone was unchanged. When comparing endocortical bone tissue of identical tissue age as defined by sequential dual fluorochrome labeling the average bone matrix mineralization was reduced -1.9% (p < 0.0001, younger tissue age) and -1.5% (p < 0.05, older tissue age), and the relative proteoglycan content was significantly increased. Similarly, bone matrix mineralization density distribution was also shifted toward lower matrix mineralization in surgical samples of compact bone of sclerosteosis patients. This was associated with an increase in mineralization heterogeneity in the young population. In addition, and consistently, the relative proteoglycan content was increased. In conclusion, we observed decreased matrix mineralization and increased relative proteoglycan content in bone subcompartments of Sost-KO mice-a finding that translated into sclerosteosis patients. We hypothesize that the altered bone composition contributes to the increased bone strength of patients with sclerostin deficiency.
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Affiliation(s)
- Norbert Hassler
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of Viennese sickness insurance funds (WGKK) and Research funds of the Austrian workers compensation board (AUVA) Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital Vienna, Austria
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46
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Eriksen EF. Commentary on sclerostin deficiency is linked to altered bone composition. J Bone Miner Res 2014; 29:2141-3. [PMID: 25158054 DOI: 10.1002/jbmr.2346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Erik Fink Eriksen
- Department of Endocrinology, Morbid Obesity, and Preventative Medicine, Oslo University Hospital, Oslo, Norway
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47
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Imbert L, Aurégan JC, Pernelle K, Hoc T. Mechanical and mineral properties of osteogenesis imperfecta human bones at the tissue level. Bone 2014; 65:18-24. [PMID: 24803077 DOI: 10.1016/j.bone.2014.04.030] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 03/18/2014] [Accepted: 04/25/2014] [Indexed: 12/12/2022]
Abstract
Osteogenesis imperfecta (OI) is a genetic disorder characterized by an increase in bone fragility on the macroscopic scale, but few data are available to describe the mechanisms involved on the tissue scale and the possible correlations between these scales. To better understand the effects of OI on the properties of human bone, we studied the mechanical and chemical properties of eight bone samples from children suffering from OI and compared them to the properties of three controls. High-resolution computed tomography, nanoindentation and Raman microspectroscopy were used to assess those properties. A higher tissue mineral density was found for OI bone (1.131 gHA/cm3 vs. 1.032 gHA/cm3, p=0.032), along with a lower Young's modulus (17.6 GPa vs. 20.5 GPa, p=0.024). Obviously, the mutation-induced collagen defects alter the collagen matrix, thereby affecting the mineralization. Raman spectroscopy showed that the mineral-to-matrix ratio was higher in the OI samples, while the crystallinity was lower, suggesting that the mineral crystals were smaller but more abundant in the case of OI. This change in crystal size, distribution and composition contributes to the observed decrease in mechanical strength.
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Affiliation(s)
- Laurianne Imbert
- LTDS UMR CNRS 5513, Ecole Centrale Lyon, 36 avenue Guy de Collongue, 69134 Ecully, France
| | - Jean-Charles Aurégan
- Department of Pediatric Orthopedics, Necker - Enfants Malades Hospital, AP-HP, Paris Descartes University, 145 rue de Sèvres, 75014 Paris, France; B2OA UMR CNRS 7052, University Paris-Diderot, 10 avenue de Verdun, 75010 Paris, France
| | - Kélig Pernelle
- LTDS UMR CNRS 5513, Ecole Centrale Lyon, 36 avenue Guy de Collongue, 69134 Ecully, France
| | - Thierry Hoc
- LTDS UMR CNRS 5513, Ecole Centrale Lyon, 36 avenue Guy de Collongue, 69134 Ecully, France.
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48
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Reeve J, Loveridge N. The fragile elderly hip: mechanisms associated with age-related loss of strength and toughness. Bone 2014; 61:138-48. [PMID: 24412288 PMCID: PMC3991856 DOI: 10.1016/j.bone.2013.12.034] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 12/24/2013] [Accepted: 12/31/2013] [Indexed: 01/23/2023]
Abstract
Every hip fracture begins with a microscopic crack, which enlarges explosively over microseconds. Most hip fractures in the elderly occur on falling from standing height, usually sideways or backwards. The typically moderate level of trauma very rarely causes fracture in younger people. Here, this paradox is traced to the decline of multiple protective mechanisms at many length scales from nanometres to that of the whole femur. With normal ageing, the femoral neck asymmetrically and progressively loses bone tissue precisely where the cortex is already thinnest and is also compressed in a sideways fall. At the microscopic scale of the basic remodelling unit (BMU) that renews bone tissue, increased numbers of actively remodelling BMUs associated with the reduced mechanical loading in a typically inactive old age augments the numbers of mechanical flaws in the structure potentially capable of initiating cracking. Menopause and over-deep osteoclastic resorption are associated with incomplete BMU refilling leading to excessive porosity, cortical thinning and disconnection of trabeculae. In the femoral cortex, replacement of damaged bone or bone containing dead osteocytes is inefficient, impeding the homeostatic mechanisms that match strength to habitual mechanical usage. In consequence the participation of healthy osteocytes in crack-impeding mechanisms is impaired. Observational studies demonstrate that protective crack deflection in the elderly is reduced. At the most microscopic levels attention now centres on the role of tissue ageing, which may alter the relationship between mineral and matrix that optimises the inhibition of crack progression and on the role of osteocyte ageing and death that impedes tissue maintenance and repair. This review examines recent developments in the understanding of why the elderly hip becomes fragile. This growing understanding is suggesting novel testable approaches for reducing risk of hip fracture that might translate into control of the growing worldwide impact of hip fractures on our ageing populations.
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Affiliation(s)
- Jonathan Reeve
- NIHR Musculoskeletal Biomedical Research Unit, Institute of Musculoskeletal Science, Nuffield Orthopaedic Centre, Oxford OX3 7HE, UK.
| | - Nigel Loveridge
- Orthopaedic Research Unit, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK; MRC Human Nutrition Research, Cambridge, UK.
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49
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Milovanovic P, Rakocevic Z, Djonic D, Zivkovic V, Hahn M, Nikolic S, Amling M, Busse B, Djuric M. Nano-structural, compositional and micro-architectural signs of cortical bone fragility at the superolateral femoral neck in elderly hip fracture patients vs. healthy aged controls. Exp Gerontol 2014; 55:19-28. [PMID: 24614625 DOI: 10.1016/j.exger.2014.03.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 02/18/2014] [Accepted: 03/02/2014] [Indexed: 12/13/2022]
Abstract
To unravel the origins of decreased bone strength in the superolateral femoral neck, we assessed bone structural features across multiple length scales at this cortical fracture initiating region in postmenopausal women with hip fracture and in aged-matched controls. Our combined methodological approach encompassed atomic force microscopy (AFM) characterization of cortical bone nano-structure, assessment of mineral content/distribution via quantitative backscattered electron imaging (qBEI), measurement of bone material properties by reference point indentation, as well as evaluation of cortical micro-architecture and osteocyte lacunar density. Our findings revealed a wide range of differences between the fracture group and the controls, suggesting a number of detrimental changes at various levels of cortical bone hierarchical organization that may render bone fragile. Namely, mineral crystals at external cortical bone surfaces of the fracture group were larger (65.22nm±41.21nm vs. 36.75nm±18.49nm, p<0.001), and a shift to a higher mineral content and more homogenous mineralization profile as revealed via qBEI were found in the bone matrix of the fracture group. Fracture cases showed nearly 35% higher cortical porosity and showed significantly reduced osteocyte lacunar density compared to controls (226±27 vs. 247±32#/mm(2), p=0.05). Along with increased crystal size, a shift towards higher mineralization and a tendency to increased cortical porosity and reduced osteocyte lacunar number delineate that cortical bone of the superolateral femoral neck bears distinct signs of fragility at various levels of its structural organization. These results contribute to the understanding of hierarchical bone structure changes in age-related fragility.
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Affiliation(s)
- Petar Milovanovic
- Laboratory for Anthropology, Institute of Anatomy, School of Medicine, University of Belgrade, 4/2 Dr Subotica, 11000 Belgrade, Serbia; Department of Osteology & Biomechanics, University Medical Center Hamburg-Eppendorf, 59 Lottestr., D-22529 Hamburg, Germany.
| | - Zlatko Rakocevic
- Laboratory for Atomic Physics, Institute of Nuclear Sciences Vinca, University of Belgrade, 11001 Belgrade, Serbia.
| | - Danijela Djonic
- Laboratory for Anthropology, Institute of Anatomy, School of Medicine, University of Belgrade, 4/2 Dr Subotica, 11000 Belgrade, Serbia.
| | - Vladimir Zivkovic
- Institute of Forensic Medicine, School of Medicine, University of Belgrade, 31a Deligradska, 11000 Belgrade, Serbia.
| | - Michael Hahn
- Department of Osteology & Biomechanics, University Medical Center Hamburg-Eppendorf, 59 Lottestr., D-22529 Hamburg, Germany.
| | - Slobodan Nikolic
- Institute of Forensic Medicine, School of Medicine, University of Belgrade, 31a Deligradska, 11000 Belgrade, Serbia.
| | - Michael Amling
- Department of Osteology & Biomechanics, University Medical Center Hamburg-Eppendorf, 59 Lottestr., D-22529 Hamburg, Germany.
| | - Bjoern Busse
- Department of Osteology & Biomechanics, University Medical Center Hamburg-Eppendorf, 59 Lottestr., D-22529 Hamburg, Germany.
| | - Marija Djuric
- Laboratory for Anthropology, Institute of Anatomy, School of Medicine, University of Belgrade, 4/2 Dr Subotica, 11000 Belgrade, Serbia.
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50
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Gamsjaeger S, Brozek W, Recker R, Klaushofer K, Paschalis EP. Transmenopausal changes in trabecular bone quality. J Bone Miner Res 2014; 29:608-17. [PMID: 23966337 DOI: 10.1002/jbmr.2073] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 08/01/2013] [Accepted: 08/05/2013] [Indexed: 02/01/2023]
Abstract
Bone strength depends on its amount and quality. Bone quality includes its structural and material properties. Bone material properties are dependent on bone turnover rates. Remodeling rates are significantly increased immediately after menopause. In the present study, we used Raman microspectroscopic analysis of double iliac crest biopsies with a spatial resolution of 1 µm obtained before and immediately after menopause (1 year after cessation of menses) in healthy females to investigate changes in material properties attributable to menopause. In particular, the mineral/matrix ratio, the relative proteoglycan and lipid content, the mineral maturity/crystallinity, and the relative pyridinoline collagen cross-link content were determined in trabecular bone as a function of surface metabolic activity and tissue age. The results indicate that significant changes (specifically in mineral/matrix ratio) were evident at active bone forming surfaces, whereas the relative proteoglycan content was altered at resorbing surfaces. These changes were not accompanied by altered mineral content or quality as monitored by Raman microspectroscopic analysis.
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Affiliation(s)
- Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology, Hanusch Hospital, Vienna, Austria
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