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The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone
BACKGROUND: Post-menopausal osteoporosis is a common health problem worldwide, most commonly caused by estrogen deficiency. Most of the information regarding the skeletal effects of this disease relates to trabecular bone, while cortical bone is less studied. The purpose of this study was to evaluat...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
PeerJ Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7811283/ https://www.ncbi.nlm.nih.gov/pubmed/33520431 http://dx.doi.org/10.7717/peerj.10213 |
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author | Shipov, Anna Zaslansky, Paul Riesemeier, Heinrich Segev, Gilad Atkins, Ayelet Kalish-Achrai, Noga Weiner, Stephen Shahar, Ron |
author_facet | Shipov, Anna Zaslansky, Paul Riesemeier, Heinrich Segev, Gilad Atkins, Ayelet Kalish-Achrai, Noga Weiner, Stephen Shahar, Ron |
author_sort | Shipov, Anna |
collection | PubMed |
description | BACKGROUND: Post-menopausal osteoporosis is a common health problem worldwide, most commonly caused by estrogen deficiency. Most of the information regarding the skeletal effects of this disease relates to trabecular bone, while cortical bone is less studied. The purpose of this study was to evaluate the influence of estrogen deficiency on the structure and mechanical properties of cortical bone. METHODS: Eight ovariectomized (OVH) and eight intact (control) Sprague Dawley rats were used.Structural features of femoral cortical bone were studied by light microscopy, scanning electron microscopy and synchrotron-based microcomputer-tomography and their mechanical properties determined by nano-indentation. RESULTS: Cortical bone of both study groups contains two distinct regions: organized circumferential lamellae and disordered bone with highly mineralized cartilaginous islands. Lacunar volume was lower in the OVH group both in the lamellar and disorganized regions (182 ± 75 µm(3) vs 232 ± 106 µm(3), P < 0.001 and 195 ± 86 µm(3) vs. 247 ± 106 µm(3), P < 0.001, respectively). Lacunar density was also lower in both bone regions of the OVH group (40 ± 18 ×10(3) lacunae/mm(3) vs. 47 ± 9×10(3) lacunae/mm(3) in the lamellar region, P = 0.003 and 63 ± 18×10(3)lacunae/mm(3) vs. 75 ± 13×10(3) lacunae/mm(3) in the disorganized region, P < 0.001). Vascular canal volume was lower in the disorganized region of the bone in the OVH group compared to the same region in the control group (P < 0.001). Indentation moduli were not different between the study groups in both bone regions. DISCUSSION: Changes to cortical bone associated with estrogen deficiency in rats require high-resolution methods for detection. Caution is required in the application of these results to humans due to major structural differences between human and rat bone. |
format | Online Article Text |
id | pubmed-7811283 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | PeerJ Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-78112832021-01-28 The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone Shipov, Anna Zaslansky, Paul Riesemeier, Heinrich Segev, Gilad Atkins, Ayelet Kalish-Achrai, Noga Weiner, Stephen Shahar, Ron PeerJ Anatomy and Physiology BACKGROUND: Post-menopausal osteoporosis is a common health problem worldwide, most commonly caused by estrogen deficiency. Most of the information regarding the skeletal effects of this disease relates to trabecular bone, while cortical bone is less studied. The purpose of this study was to evaluate the influence of estrogen deficiency on the structure and mechanical properties of cortical bone. METHODS: Eight ovariectomized (OVH) and eight intact (control) Sprague Dawley rats were used.Structural features of femoral cortical bone were studied by light microscopy, scanning electron microscopy and synchrotron-based microcomputer-tomography and their mechanical properties determined by nano-indentation. RESULTS: Cortical bone of both study groups contains two distinct regions: organized circumferential lamellae and disordered bone with highly mineralized cartilaginous islands. Lacunar volume was lower in the OVH group both in the lamellar and disorganized regions (182 ± 75 µm(3) vs 232 ± 106 µm(3), P < 0.001 and 195 ± 86 µm(3) vs. 247 ± 106 µm(3), P < 0.001, respectively). Lacunar density was also lower in both bone regions of the OVH group (40 ± 18 ×10(3) lacunae/mm(3) vs. 47 ± 9×10(3) lacunae/mm(3) in the lamellar region, P = 0.003 and 63 ± 18×10(3)lacunae/mm(3) vs. 75 ± 13×10(3) lacunae/mm(3) in the disorganized region, P < 0.001). Vascular canal volume was lower in the disorganized region of the bone in the OVH group compared to the same region in the control group (P < 0.001). Indentation moduli were not different between the study groups in both bone regions. DISCUSSION: Changes to cortical bone associated with estrogen deficiency in rats require high-resolution methods for detection. Caution is required in the application of these results to humans due to major structural differences between human and rat bone. PeerJ Inc. 2021-01-13 /pmc/articles/PMC7811283/ /pubmed/33520431 http://dx.doi.org/10.7717/peerj.10213 Text en ©2021 Shipov et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
spellingShingle | Anatomy and Physiology Shipov, Anna Zaslansky, Paul Riesemeier, Heinrich Segev, Gilad Atkins, Ayelet Kalish-Achrai, Noga Weiner, Stephen Shahar, Ron The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title | The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title_full | The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title_fullStr | The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title_full_unstemmed | The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title_short | The influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
title_sort | influence of estrogen deficiency on the structural and mechanical properties of rat cortical bone |
topic | Anatomy and Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7811283/ https://www.ncbi.nlm.nih.gov/pubmed/33520431 http://dx.doi.org/10.7717/peerj.10213 |
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