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Nakashima M, Suzuki A, Hashimoto K, Yamashita M, Fujiwara Y, Miyamoto Y. Vitronectin regulates osteoclastogenesis and bone remodeling in a mouse model of osteoporosis. Anat Cell Biol 2024; 57:305-315. [PMID: 38575559 PMCID: PMC11184428 DOI: 10.5115/acb.23.251] [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: 09/26/2023] [Revised: 02/29/2024] [Accepted: 03/06/2024] [Indexed: 04/06/2024] Open
Abstract
Vitronectin (VN) is an extracellular matrix protein with a crucial role in regulating bone remodeling. In this study, we aimed to investigate the effect of VN deficiency in a mouse model of osteoporosis induced by ovariectomy (OVX). The findings revealed that the absence of VN led to an increase in the activity of tartrate-resistant acid phosphatase (TRAP), a marker for osteoclasts, in the plasma of OVX-operated mice. TRAP staining further demonstrated that VN deficiency resulted in a higher number of osteoclasts within the femurs of OVX-operated mice. X-ray micro-computed tomography analysis of the femurs in OVX-operated mice indicated that VN deficiency significantly suppressed the OVX-induced increase of marrow area and total volume of bone. Additionally, we assessed structural model index (SMI) and degree of anisotropy (DA) as indices of osteoporosis. The results showed that VN deficiency effectively attenuated the OVX-induced increase in SMI and DA among OVX-operated mice. In summary, our study demonstrates the vital role of VN in regulating osteoclastogenesis and bone remodeling in the mouse model of osteoporosis.
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Affiliation(s)
- Mari Nakashima
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
| | - Akiko Suzuki
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
| | - Kei Hashimoto
- Institute for Human Life Science, Ochanomizu University, Tokyo, Japan
| | - Mayu Yamashita
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
| | - Yoko Fujiwara
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
- Institute for Human Life Science, Ochanomizu University, Tokyo, Japan
| | - Yasunori Miyamoto
- Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
- Institute for Human Life Science, Ochanomizu University, Tokyo, Japan
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Schröder G, Jabke B, Schulze M, Wree A, Martin H, Sahmel O, Doerell A, Kullen CM, Andresen R, Schober HC. A comparison, using X-ray micro-computed tomography, of the architecture of cancellous bone from the cervical, thoracic and lumbar spine using 240 vertebral bodies from 10 body donors. Anat Cell Biol 2021; 54:25-34. [PMID: 33583827 PMCID: PMC8017461 DOI: 10.5115/acb.20.269] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/06/2020] [Accepted: 12/07/2020] [Indexed: 11/29/2022] Open
Abstract
The vertebral trabecular bone has a complex three-dimensional microstructure with an inhomogeneous morphology. Correct identification and assessment of the weakest segments of the cancellous bone may lead to better prediction of fracture risk. The aim of this study was to compare cancellous bone from 240 vertebrae of the cervical, thoracic and lumbar spine of ten body donors with osteoporosis in regard to bone volume fraction (BVF), trabecular thickness, separation, trabecular number and degree of anisotropy, to ascertain why cervical vertebrae rarely fracture, even with severe osteoporosis. Samples were obtained from all vertebrae with a Jamshidi needle (8 Gauge). The investigations were performed with a micro-computed tomography (micro-CT) device (SKYSCAN 1172, RJL Micro & Analytic GmbH, Karlsdorf-Neuthard, Germany). Existing vertebral fractures and the bone mineral density of the lumbar spine were assessed with quantitative CT. Regarding the micro-CT parameters, statistically significant differences were observed between the various sections of the spine. We found a higher BVF, trabecular number and trabecular thickness, as well as a lower trabecular separation of the cervical vertebrae compared to other vertebrae. In addition, the degree of anisotropy in the cervical spine is lower than in the other spinal column sections. These results are age and sex dependent. Thus, the cervical spine has special structural features, whose causes must be determined in further investigations.
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Affiliation(s)
- Guido Schröder
- Clinic for Surgery, Department of Orthopedics and Trauma Surgery, Buetzow, Germany
| | - Benjamin Jabke
- Department of Internal Medicine, University Medical School Rostock, Rostock, Germany
| | - Marko Schulze
- Institute of Anatomy, University Medical School Rostock, Rostock, Germany
| | - Andreas Wree
- Institute of Anatomy, University Medical School Rostock, Rostock, Germany
| | - Heiner Martin
- Institute for Biomedical Engineering, University of Rostock, Rostock-Warnemuende, Germany
| | - Olga Sahmel
- Institute for Biomedical Engineering, University of Rostock, Rostock-Warnemuende, Germany
| | | | - Claus Maximilian Kullen
- Institute of Diagnostic and Interventional Radiology/Neuroradiology, Westkuestenklinikum Heide, Academic Teaching Hospital of the Universities of Kiel, Luebeck and Hamburg, Heide, Germany
| | - Reimer Andresen
- Institute of Diagnostic and Interventional Radiology/Neuroradiology, Westkuestenklinikum Heide, Academic Teaching Hospital of the Universities of Kiel, Luebeck and Hamburg, Heide, Germany
| | - Hans-Christof Schober
- Department of Internal Medicine IV, Municipal Hospital Suedstadt Rostock, Academic Teaching Hospital of the University of Rostock, Rostock, Germany
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