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Maidana DE, Gonzalez-Buendia L, Pastor-Puente S, Naqvi A, Paschalis E, Kazlauskas A, Miller JW, Vavvas DG. Peripheral monocytes and neutrophils promote photoreceptor cell death in an experimental retinal detachment model. Cell Death Dis 2023; 14:834. [PMID: 38102109 PMCID: PMC10724298 DOI: 10.1038/s41419-023-06350-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/31/2023] [Accepted: 11/29/2023] [Indexed: 12/17/2023]
Abstract
Photoreceptor cell death and immune cell infiltration are two major events that contribute to retinal degeneration. However, the relationship between these two events has not been well delineated, primarily because of an inadequate understanding of the immunological processes involved in photoreceptor degeneration, especially that of peripheral leukocytes that infiltrate the subretinal space and retinal tissues. In this work, we characterized the role of leukocyte infiltration within the detached retina. We observed that CD45+ CD11b+ Ly6G+ neutrophils and CD45+ CD11b+ Ly6G- Ly6C+ monocytes are the predominant peripheral immune cell populations that infiltrate the retinal and subretinal space after detachment. Selective depletion of monocytes or neutrophils using cell-specific targeting is neuroprotective for photoreceptors. These results indicate that peripheral innate immune cells contribute to photoreceptor degeneration, and targeting these immune cell populations could be therapeutic during retinal detachment.
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Affiliation(s)
- Daniel E Maidana
- Retina Service, Angiogenesis Lab, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
- Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, University of Illinois at Chicago, Chicago, IL, USA
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, USA
| | - Lucia Gonzalez-Buendia
- Retina Service, Angiogenesis Lab, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Sara Pastor-Puente
- Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, University of Illinois at Chicago, Chicago, IL, USA
| | - Afsar Naqvi
- Mucosal Immunology Lab, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Eleftherios Paschalis
- Retina Service, Angiogenesis Lab, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Andrius Kazlauskas
- Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, University of Illinois at Chicago, Chicago, IL, USA
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, USA
| | - Joan W Miller
- Retina Service, Angiogenesis Lab, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Demetrios G Vavvas
- Retina Service, Angiogenesis Lab, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA.
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André C, Islam MM, Paschalis E, Bispo PJM. Comparative In Vitro Activity of New Lipoglycopeptides and Vancomycin Against Ocular Staphylococci and Their Toxicity on the Human Corneal Epithelium. Cornea 2023; 42:615-623. [PMID: 36455096 PMCID: PMC10060036 DOI: 10.1097/ico.0000000000003197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/26/2022] [Accepted: 10/11/2022] [Indexed: 12/05/2022]
Abstract
PURPOSE The purpose of this study was to assess the potential of new lipoglycopeptides as novel topical therapies for improved treatment of recalcitrant ocular infections. We evaluated the in vitro antimicrobial activity of oritavancin, dalbavancin, and telavancin compared with vancomycin (VAN) against a large collection of ocular staphylococcal isolates and their cytotoxicity on human corneal epithelial cells (HCECs). METHODS Antimicrobial susceptibility testing was performed by broth microdilution against 223 Staphylococcus spp. clinical isolates. Time-kill kinetics were determined for methicillin-resistant strains of Staphylococcus aureus (MRSA) (n = 2) and Staphylococcus epidermidis (MRSE) (n = 1). In vitro cytotoxicity assays were performed with AlamarBlue and live/dead staining on HCECs. RESULTS All new lipoglycopeptides showed strong in vitro potency against ocular staphylococci, including multidrug-resistant MRSA strains, with dalbavancin showing a slightly higher potency overall [minimum inhibitory concentration (MIC) 90 0.06 μg/mL] compared with telavancin and oritavancin (MIC 90 0.12 μg/mL), whereas VAN had the lowest potency (MIC 90 2 μg/mL). Oritavancin exerted rapid bactericidal activity within 1 h for MRSA and 2 h for MRSE. All other drugs were bactericidal within 24 h. At a concentration commonly used for topical preparations (25 mg/mL), cytotoxicity was observed for VAN after 5 min of incubation, whereas reduction in HCEC viability was not seen for telavancin and was less affected by oritavancin and dalbavancin. Cytotoxicity at 25 mg/mL was seen for all drugs at 30 and 60 min but was significantly reduced or undetected for lower concentrations. CONCLUSIONS Our study demonstrates that new lipoglycopeptides have substantially better in vitro antimicrobial activity against ocular staphylococcal isolates compared with VAN, with a similar or improved toxicity profile on HCECs.
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Affiliation(s)
- Camille André
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA
- Infectious Disease Institute, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA; and
| | - Mohammad Mirazul Islam
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA
- Department of Ophthalmology, Schepens Eye Research Institute, Harvard Medical School, Boston, MA
| | - Eleftherios Paschalis
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA
- Department of Ophthalmology, Schepens Eye Research Institute, Harvard Medical School, Boston, MA
| | - Paulo J. M. Bispo
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA
- Infectious Disease Institute, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA; and
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Leisser C, Paschalis E, Rokidi S, Behanova M, Ruiss M, Burgmüller W, Findl O. Fourier-Transform Infrared Spectroscopy of Epiretinal Membranes and Internal Limiting Membranes after Pars Plana Vitrectomy with Membrane Peeling. Ophthalmic Res 2021; 64:793-797. [PMID: 33951668 DOI: 10.1159/000516633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 04/02/2021] [Indexed: 11/19/2022]
Affiliation(s)
- Christoph Leisser
- VIROS-Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, 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
| | - 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
| | - Martina Behanova
- 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
| | - Manuel Ruiss
- VIROS-Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria
| | - Wilhelm Burgmüller
- VIROS-Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria
| | - Oliver Findl
- VIROS-Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria
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Rokidi S, Bravenboer N, Gamsjaeger S, Chavassieux P, Zwerina J, Paschalis E, Papapoulos S, Appelman-Dijkstra N. Impact microindentation assesses cortical bone material properties in humans. Bone Rep 2020. [DOI: 10.1016/j.bonr.2020.100395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Rokidi S, Bravenboer N, Gamsjaeger S, Misof B, Blouin S, Chavassieux P, Klaushofer K, Paschalis E, Papapoulos S, Appelman-Dijkstra N. Impact microindentation assesses subperiosteal bone material properties in humans. Bone 2020; 131:115110. [PMID: 31655220 DOI: 10.1016/j.bone.2019.115110] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/14/2019] [Accepted: 10/14/2019] [Indexed: 11/19/2022]
Abstract
Impact microindentation (IMI) is a Reference Point Indentation technique measuring tissue-level properties of cortical bone in humans in vivo. The nature, however, of the properties that can affect bone strength is incompletely understood. In the present study we examined bone material properties in transiliac bone biopsies obtained concurrently with measurements of Bone Material Strength index (BMSi) by IMI in 12 patients with different skeletal disorders and a wide range of BMD, with or without fractures (8 males, 4 females, mean age 48±12.2 (SD) years, range 15-60 years). IMI was performed in the mid-shaft of the right tibia with a hand-held microindenter (OsteoProbe). Cancellous and cortical bone mineralization density distributions (BMDD) were measured in the entire biopsy bone area by quantitative backscattered electron imaging. Raman measurements were obtained right at the outer edge of the cortex, and 5, 50, 100, 500μm inwards. The calculated parameters were: i) Mineral and organic matrix content as well as the mineral / matrix ratio. ii) Nanoporosity. iii) Glycosaminoglycan content. iv) Pyridinoline content. v) Maturity/crystallinity of the apatite crystallites. There was no relationship between BMSi values with any measurement of mineral content of whole bone tissue (BMD, BMDD) or maturity/crystallinity of bone mineral. On the other hand, a positive correlation between BMSi and local mineral content, and an inverse correlation between BMSi and nanoporosity at the mineralized subperiosteal edge of the sample and at 5μm inwards was found. A positive correlation was also observed between BMSi and pyridinoline content at the same locations. These results indicate that local mineral content, nanoporosity and pyridinoline content at the subperiosteal site in the transiliac bone biopsy are linked to the BMSi values measured in the tibia. As both high porosity at the nano level and low pyridinoline content of the bone matrix can negatively impact bone strength, our findings suggest that BMSi most likely assesses subperiosteal bone material properties.
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Affiliation(s)
- Stamatia Rokidi
- 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
| | - Natalie Bravenboer
- Leiden Center for Bone Quality, Leiden University Medical Center, Leiden, the Netherlands
| | - Sonja Gamsjaeger
- 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
| | - Barbara Misof
- 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
| | - Stéphane Blouin
- 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
| | | | - Klaus Klaushofer
- 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
| | - Eleftherios Paschalis
- 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.
| | - Socrates Papapoulos
- Leiden Center for Bone Quality, Leiden University Medical Center, Leiden, the Netherlands
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Lindahl K, Åström E, Dragomir A, Symoens S, Coucke P, Larsson S, Paschalis E, Roschger P, Gamsjaeger S, Klaushofer K, Fratzl-Zelman N, Kindmark A. Homozygosity for CREB3L1 premature stop codon in first case of recessive osteogenesis imperfecta associated with OASIS-deficiency to survive infancy. Bone 2018; 114:268-277. [PMID: 29936144 DOI: 10.1016/j.bone.2018.06.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 06/20/2018] [Accepted: 06/20/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Mutations of the endoplasmic reticulum (ER)-stress transducer OASIS (encoded by CREB3L1), cause severe recessive osteogenesis imperfecta (OI) not compatible with surviving the neonatal period, as has been shown in two unrelated families through a whole gene deletion vs. a qualitative alteration of OASIS. Heterozygous carriers in the described families have exhibited a mild phenotype. OASIS is a transcription factor highly expressed in osteoblasts, and OASIS-/- mice exhibit severe osteopenia and spontaneous fractures. Here, we expand the clinical spectrum by a detailed phenotypic characterization of the first case of OASIS-associated OI surviving the neonatal period, with heterozygous family members being unaffected. METHODS All OI-associated genes were sequenced. Primary human osteoblast-like cell (hOB) and fibroblast (FB) cultures were obtained for qPCR, and steady-state collagen biochemistry. FB, hOB and skin biopsies were ultrastructurally analyzed. Bone was analyzed by μCT, histomorphometry, quantitative backscattered electron imaging (qBEI), and Raman microspectroscopy. RESULTS The proband, a boy with severe OI, had blue sclera and tooth agenesis. A homozygous CREB3L1 stop codon mutation was detected by sequencing, while several family members were heterozygotes. Markedly low levels of CREB3L1 mRNA were confirmed by qPCR in hOBs (16%) and FB (21%); however, collagen I levels were only reduced in hOBs (5-10%). Electron microscopy of hOBs showed pronounced alterations, with numerous myelin figures and diminished RER vs. normal ultrastructure of FB. Bone histomorphometry and qBEI were similar to collagen I OI, with low trabecular thickness and mineral apposition rate, and increased bone matrix mineralization. Raman microspectroscopy revealed low level of glycosaminoglycans. Clinical response to life-long bisphosphonate treatment was as expected in severe OI with steadily increasing bone mineral density, but despite this the boy suffered repeated childhood fractures. CONCLUSIONS Deficiency of OASIS can cause severe OI compatible with surviving the neonatal period. A marked decrease of collagen type I transcription was noted in bone tissue, but not in skin, and ultrastructure of hOBs was pathological. Results also suggested OASIS involvement in glycosaminoglycan secretion in bone.
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Affiliation(s)
- Katarina Lindahl
- Dept. of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden.
| | - Eva Åström
- Department of Woman and Child Health, Karolinska Institutet and Pediatric Neurology, Astrid Lindgren Children's Hospital at Karolinska University Hospital, Stockholm, Sweden
| | - Anca Dragomir
- Dept. of Surgical Pathology, Uppsala University Hospital, Uppsala, Sweden
| | - Sofie Symoens
- Dept. of Medical Genetics, The University Hospital in Ghent, Ghent, Belgium
| | - Paul Coucke
- Dept. of Medical Genetics, The University Hospital in Ghent, Ghent, Belgium
| | - Sune Larsson
- Dept. of Surgical Sciences, Uppsala University Hospital, Uppsala, Sweden
| | - Eleftherios Paschalis
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 1st Medical Department Hanusch Hospital, Vienna, Austria
| | - Paul Roschger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 1st Medical Department Hanusch Hospital, Vienna, Austria
| | - Sonja Gamsjaeger
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 1st Medical Department Hanusch Hospital, Vienna, Austria
| | - Klaus Klaushofer
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 1st Medical Department Hanusch Hospital, Vienna, Austria
| | - Nadja Fratzl-Zelman
- Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Center Meidling, 1st Medical Department Hanusch Hospital, Vienna, Austria
| | - Andreas Kindmark
- Dept. of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden
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Abstract
The diagnosis of osteoporosis is based on low bone mineral density (BMD) and/or the occurrence of fragility fractures. The majority of patients, however, have also abnormally low bone matrix mineralization. The latter is indicative of alterations in bone turnover rates and/or in kinetics of mineral accumulation within the newly formed bone matrix. Osteoporosis therapies can alter the bone matrix mineralization according to their action on bone turnover and/or mineralization kinetics. Antiresorptives, including the most widely used bisphosphonates, reduce the bone turnover rate resulting in a decrease in heterogeneity and an increase in the degree of mineralization toward to or even beyond normal values. Anabolic agents increase the bone volume and the amount of newly formed bone resulting in a likely transient decrease in mean degree and homogeneity of mineralization. Hence, the measurement of bone matrix mineralization is a sensitive tool to evaluate the response to therapy.
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Affiliation(s)
- Paul Roschger
- 1st Medical Department, Hanusch Hospital, Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, Heinrich Collin Str. 30, A-1140, Vienna, Austria,
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Shabestari M, Eriksen EF, Roschger P, Paschalis E, Diez-Perez A. A case of atypical femoral fracture with abnormal cortical bone characterized by impaired mineralization and pyrophosphate accumulation. ACTA ACUST UNITED AC 2013. [DOI: 10.1530/boneabs.1.pp417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Pleiner-Duxneuner J, Zwettler E, Paschalis E, Roschger P, Nell-Duxneuner V, Klaushofer K. Treatment of osteoporosis with parathyroid hormone and teriparatide. Calcif Tissue Int 2009; 84:159-70. [PMID: 19189037 DOI: 10.1007/s00223-009-9218-x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Accepted: 01/05/2009] [Indexed: 11/25/2022]
Abstract
Nowadays osteoporosis treatment is based primarily on therapy with antiresorptive agents, like the bisphosphonates. Parathyroid hormone (Preotact) and human recombinant parathyroid hormone peptide 1-34 (Teriparatide) are relatively new for the treatment of osteoporosis and belong to the group of anabolic agents. Both agents demonstrated an increase in bone mineral density and a significant reduction in vertebral fractures in postmenopausal women with osteoporosis when given for 18-24 months. Data on nonvertebral fractures are, however, not clear-cut, and so far only bisphosphonates and strontium ranelate have been demonstrated to reduce all types of fractures and therefore remain the front-line option for treatment of osteoporosis. As the safety, tolerability, and cost of the therapy also influence the choice of therapy, Preotact and Teriparatide might be useful additions to the armamentarium for (second-line) treatment of osteoporosis.
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Affiliation(s)
- Johannes Pleiner-Duxneuner
- 4th Medicine Department, Hanusch Hospital, Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, Vienna, Austria.
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11
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Kazanci M, Wagner HD, Manjubala NI, Gupta HS, Paschalis E, Roschger P, Fratzl P. Raman imaging of two orthogonal planes within cortical bone. Bone 2007; 41:456-61. [PMID: 17602910 DOI: 10.1016/j.bone.2007.04.200] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 02/23/2007] [Accepted: 04/19/2007] [Indexed: 10/23/2022]
Abstract
The lamellar bone's strength is mainly affected by the organization of its mineralized collagen fibers and material composition. In the present study, Raman microspectroscopic and imaging analyses were employed to study a normal human femoral midshaft bone cube-like specimen with a spatial resolution of approximately 1-2 microm. Identical bone lamellae in both longitudinal and transverse directions were analyzed, which allowed us to separate out orientation and composition dependent Raman lines, depending on the polarization directions. This approach gives information about lamellar bone orientation and variation in bone composition. It is shown that the nu1 PO4 to amide I ratio mainly displays lamellar bone orientation; and nu2 PO4 to amide III and CO3 to nu2 PO4 ratios display variation in bone composition. The nu2 PO4 to amide III ratio is higher in the interstitial bone region, whereas the CO3 to nu2 PO4 ratio has lower values in the same region. The present study provides fresh insights into the organization of a lamellar bone tissue from two orthogonal orientations.
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Affiliation(s)
- M Kazanci
- Max Planck Institute of Colloids and Interfaces, Department of Biomaterials, 14424 Potsdam, Germany, and Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK, Vienna, Austria
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12
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Boskey AL, DiCarlo E, Paschalis E, West P, Mendelsohn R. Comparison of mineral quality and quantity in iliac crest biopsies from high- and low-turnover osteoporosis: an FT-IR microspectroscopic investigation. Osteoporos Int 2005; 16:2031-8. [PMID: 16088360 PMCID: PMC1457020 DOI: 10.1007/s00198-005-1992-3] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Accepted: 07/07/2005] [Indexed: 11/30/2022]
Abstract
Fourier-transform infrared microspectroscopy (FTIRM) allows analysis of mineral content, mineral crystal maturity and mineral composition at approximately 10-micron spatial resolution. Previous FTIRM analyses comparing 4-micron thick sections from non-decalcified iliac crest biopsies from women with post-menopausal osteoporosis, as contrasted with iliac crest tissue from individuals without evidence of metabolic bone disease, demonstrated significant differences in average mineral content (decreased in osteoporosis) and mineral crystal size/perfection (increased in osteoporosis). More importantly, these parameters, which vary throughout the tissue in relation to the tissue age in healthy bone, showed no such variation in bone biopsies from patients with osteoporosis. The present study compares the spatial and temporal variation in mineral quantity and properties in trabecular bone in high- and low-turnover osteoporosis. Specifically, six biopsies from women (n=5) and one man with high-turnover osteoporosis (age range 39-77) and four women and two men with low turnover osteoporosis (age range 37-63) were compared to ten "normal" biopsies from three men and seven woman (age range: 27-69). "High turnover" was defined as the presence of increased resorptive surface, higher than normal numbers of osteoclasts and greater than or equal to normal osteoblastic activity. "Low turnover" was defined as lower than normal resorptive surface, decreased osteoclast number and less than normal osteoblastic activity. Comparing variations in FTIR-derived values for each of the parameters measured at the surfaces of the trabecular bone to the maximum value observed in multiple trabeculae from each person, the high-turnover samples showed little change in the mineral: matrix ratio, carbonate: amide I ratio, crystallinity and acid phosphate content. The low-turnover samples also showed little change in these parameters, but in contrast to the high-turnover samples, the low-turnover samples showed a slight increase in these parameters, indicative of retarded, but existent resorption and formation. These data indicate that FTIR microspectroscopy can provide quantitative information on mineral changes in osteoporosis that are consistent with proposed mechanisms of bone loss.
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Affiliation(s)
- A L Boskey
- Mineralized Tissue Laboratory Program in Musculoskeletal Integrity, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA.
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Abstract
Transforming growth factor-beta 1 (TGF-beta1) is a cytokine member of the TGF-beta superfamily involved in the control of proliferation and differentiation of various cell types. TGF-beta1 plays an important role in bone formation and resorption. To determine the effect of TGF-beta1 deficiency on bone mineral and matrix, tibias from mice in which TGF-beta1 expression had been ablated (TGF-beta1 null) were analyzed and compared with background- and age-matched wild-type (WT) control animals by Fourier transform-infrared imaging (FTIRI) and histochemistry. FTIRI allows the characterization of nondemineralized thin tissue sections at the ultrastructural level with a spatial resolution of approximately 7 microm. The spectroscopic parameters calculated were: mineral-to-matrix ratio (previously shown to correspond to ash weight); mineral crystallinity (related to the crystallographically determined crystallite size and perfection in the apatite c-axis direction); and collagen maturity (related to the ratio of pyridinoline:deH-DHLNL collagen cross-links). Several fields were selected to represent different stages of bone development within the same specimen from the secondary ossification center to the distal diaphysis. Anatomically equivalent areas were compared as a function of age and genotype. The spectroscopic results were expressed both as color-coded images and as pixel population distributions for each of the three parameters monitored. Based on comparisons of histochemistry and FTIRI, there were distinctive age and genotype variations. At all ages examined, in the TGF-beta1 null mice growth plates, alkaline phosphatase (ALP) activity and collagen maturity were reduced, but no effect on mineral content or crystallinity was noted. In the TGF-beta1 null mice metaphyses, there was a persistence of trabeculae, but no significant alterations in mineral content or crystallinity. In contrast, mineral content, mineral crystallinity, and collagen maturity were reduced in the secondary ossification center and cortical bone of the TGF-beta1 null mice. These results, consistent with a mechanism of impaired bone maturation in the TGF-beta1 null mice, may be directly related to TGF-beta1 deficiency and indirectly to increased expression of inflammatory cytokines in the TGFbeta1 null mice.
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Affiliation(s)
- E Atti
- Mineralized Tissues Laboratory, Hospital for Special Surgery, New York, NY 10021, USA
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14
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Boskey AL, Spevak L, Paschalis E, Doty SB, McKee MD. Osteopontin deficiency increases mineral content and mineral crystallinity in mouse bone. Calcif Tissue Int 2002; 71:145-54. [PMID: 12073157 DOI: 10.1007/s00223-001-1121-z] [Citation(s) in RCA: 239] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2001] [Accepted: 01/16/2002] [Indexed: 10/27/2022]
Abstract
Fourier transform infrared microspectroscopy (FTIRM) and infrared imaging (FTIRI) were used to characterize the mineral in bones of two different lines of Opn-deficient (Opn-/-) mice and their background-matched wild-type controls (Opn+/+). Sections of tibia and femur from 12-week-old and 16-week-old mice were evaluated with a spatial resolution between 10 microm (FTIRM) and 7 microm (FTIRI). FTIRI was used to examine 400 microm x 400 microm areas in cortical bone and trabecular bone and FTIRM examined selected 20 microm x 20 microm areas at sites within these anatomically defined areas. Despite the absence of an obvious phenotype in Opn-deficient mice, being undetectable by radiographic and histological methods, FTIRM analyses revealed that the relative amount of mineral in the more mature areas of the bone (central cortical bone) of Opn-knockout mice was significantly increased. Moreover, mineral maturity (mineral crystal size and perfection) throughout all anatomic regions of the Opn-deficient bone was significantly increased. The 2-dimensional, color-coded data (images) produced by FTIRI showed similar increases in mineral maturity in the Opn-/- bone, however, the crystallinity parameters were less sensitive, and significance was not achieved in all areas analyzed. Nonetheless, the findings of increased mineral content and increased crystal size/perfection in both lines of Opn-deficient mice at both ages are consistent with in vitro data indicating that Opn is a potent inhibitor of mineral formation and mineral crystal growth and proliferation, and also support a role for Opn in osteoclast recruitment and function.
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Affiliation(s)
- A L Boskey
- Hospital for Special Surgery, New York, NY 10021, USA
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15
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Gadeleta SJ, Boskey AL, Paschalis E, Carlson C, Menschik F, Baldini T, Peterson M, Rimnac CM. A physical, chemical, and mechanical study of lumbar vertebrae from normal, ovariectomized, and nandrolone decanoate-treated cynomolgus monkeys (Macaca fascicularis). Bone 2000; 27:541-50. [PMID: 11033450 DOI: 10.1016/s8756-3282(00)00362-8] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Ovariectomized cynomolgus monkeys have previously been investigated as a nonhuman primate model of postmenopausal osteoporosis (Jerome et al., Bone Miner 9:527-540; 1994). In the present study, Fourier transform infrared microspectroscopy (FTIRM) was used to verify that differences in bone mineral quality and quantity in the vertebrae of mature intact (INT) and ovariectomized (ovx) monkeys were analogous to those seen in osteoporotic and nondiseased human bones. FTIRM spectra were acquired from 15 trabeculae per vertebra from three ovx and three INT adult monkeys (mean age 8 years). These spectra were compared with those of both trabecular and previously reported osteonal bone obtained from 3 "normal" and 11 postmenopausal osteoporotic human subjects. While variations in the mineral:matrix ratio (mineral content), carbonate:phosphate ratio, and crystallinity are typical for trabecular bone from iliac crests of normal human subjects, the values of these parameters were relatively static for trabecular bone from postmenopausal osteoporotic human subjects. In general, trabecular bone from postmenopausal osteoporotic human subjects exhibited decreased mineral content (1.0 +/- 0.5 vs. 2.9 +/- 0.6), increased crystallinity, and increased carbonate:phosphate relative to controls. Similarly, trabecular bone from ovariectomized monkeys exhibited lower mineral content (5.8 +/- 0.2) compared with the INT group (6.2 +/- 0.2; p </= 0.05) and contained larger/more perfect apatite crystals (increased crystallinity) with increased carbonate:phosphate ratios. Variations in absolute values were attributable to site differences (ilium vs. vertebrae). To appreciate the importance of mineral properties on mechanical properties, compression testing was performed using cores of monkey L-3 and L-4 vertebral bodies from a separate group of monkeys. Treating monkeys with the anabolic steroid nandrolone decanoate (ND) immediately after ovariectomy and for the next 24 months (ND group), or beginning 12 months after ovariectomy (dND group), increased the ultimate stress compared with an ovx treatment group, despite large interanimal variations in bone architecture and mechanical properties. These data support the hypothesis that ovariectomized adult monkeys are an excellent model for postmenopausal osteoporosis, and can be used for the evaluation of therapeutic modalities.
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