$Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice$
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Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice

Yan-zhi Liu,1,2 Mohammed P Akhter,3 Xiang Gao,4 Xiao-yan Wang,2 Xiao-bei Wang,2 Gang Zhao,2 Xin Wei,2 Hao-jun Wu,4 Hang Chen,4 Dong Wang,2 Liao Cui1 1Guangdong Key Laboratory for Research and Development of Natural Drugs, Guangdong Medical University, Zhanjiang, People’s Republic of China...

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Autores principales:	Liu YZ, Akhter MP, Gao X, Wang XY, Wang XB, Zhao G, Wei X, Wu HJ, Chen H, Wang D, Cui L
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2018
Materias:	delayed healing non-union fracture glucocorticoid mouse Geriatrics RC952-954.6
Acceso en línea:	https://doaj.org/article/413d8a85e64444149da32ff099fc4513
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spelling	oai:doaj.org-article:413d8a85e64444149da32ff099fc45132021-12-02T00:50:31ZGlucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice1178-1998https://doaj.org/article/413d8a85e64444149da32ff099fc45132018-08-01T00:00:00Zhttps://www.dovepress.com/glucocorticoid-induced-delayed-fracture-healing-and-impaired-bone-biom-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Yan-zhi Liu,1,2 Mohammed P Akhter,3 Xiang Gao,4 Xiao-yan Wang,2 Xiao-bei Wang,2 Gang Zhao,2 Xin Wei,2 Hao-jun Wu,4 Hang Chen,4 Dong Wang,2 Liao Cui1 1Guangdong Key Laboratory for Research and Development of Natural Drugs, Guangdong Medical University, Zhanjiang, People’s Republic of China; 2Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, USA; 3Osteoporosis Research Center, Department of Medicine, Creighton University, Omaha, NE, USA; 4Stem Cell Research and Cellular Therapy Center, Department of Orthopaedics, Affiliated Hospital of Guangdong Medical University, Zhanjiang, People’s Republic of China Background: The objective of the study was to investigate the effects of glucocorticoid (GC) on the fracture healing process in a closed femur fracture mice model.Materials and methods: Forty 12-week-old female CD-1 mice were randomly allocated into four groups: healthy control and mice with prednisone exposure (oral gavage), 6 mg/kg/day (GC-L), 9 mg/kg/day (GC-M) and 12 mg/kg/day (GC-H). Three weeks after the initiation of prednisone dosing, closed femur fractures were created on prednisone-exposed mice and the healthy control. Prednisone administration was continued for 9 weeks post-fracture, and X-ray imaging was performed weekly to monitor the fracture healing process until the mice were euthanized. Necropsy was performed after 9 weeks and the fractured femurs were isolated and processed at necropsy for micro-CT and biomechanical property analysis. Another 20 mice (control and GC-H, 10 mice/group) were used for histology and micro-CT analysis at early time point (2-week post fracture) with continued prednisone exposure.Results: The results showed that oral administration of prednisone for 3 months in this strain of mice could inhibit endochondral ossification and delay the healing process, especially hard callus formation (woven bone) and bone remodeling during healing. It also could significantly decrease bone biomechanical properties.Conclusion: Long-term GC administration leads to significantly delayed fracture healing and impaired bone biomechanical properties. This mouse model may be used to systematically study the cellular and molecular mechanisms underlying fracture healing with GC treatment background and may also be used to study the influence of different therapeutic interventions for bone fracture healing. Keywords: delayed healing, non-union, fracture, glucocorticoid, mouse, stiffness, toughnessLiu YZAkhter MPGao XWang XYWang XBZhao GWei XWu HJChen HWang DCui LDove Medical Pressarticledelayed healingnon-unionfractureglucocorticoidmouseGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 13, Pp 1465-1474 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	delayed healing non-union fracture glucocorticoid mouse Geriatrics RC952-954.6
spellingShingle	delayed healing non-union fracture glucocorticoid mouse Geriatrics RC952-954.6 Liu YZ Akhter MP Gao X Wang XY Wang XB Zhao G Wei X Wu HJ Chen H Wang D Cui L Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
description	Yan-zhi Liu,1,2 Mohammed P Akhter,3 Xiang Gao,4 Xiao-yan Wang,2 Xiao-bei Wang,2 Gang Zhao,2 Xin Wei,2 Hao-jun Wu,4 Hang Chen,4 Dong Wang,2 Liao Cui1 1Guangdong Key Laboratory for Research and Development of Natural Drugs, Guangdong Medical University, Zhanjiang, People’s Republic of China; 2Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, USA; 3Osteoporosis Research Center, Department of Medicine, Creighton University, Omaha, NE, USA; 4Stem Cell Research and Cellular Therapy Center, Department of Orthopaedics, Affiliated Hospital of Guangdong Medical University, Zhanjiang, People’s Republic of China Background: The objective of the study was to investigate the effects of glucocorticoid (GC) on the fracture healing process in a closed femur fracture mice model.Materials and methods: Forty 12-week-old female CD-1 mice were randomly allocated into four groups: healthy control and mice with prednisone exposure (oral gavage), 6 mg/kg/day (GC-L), 9 mg/kg/day (GC-M) and 12 mg/kg/day (GC-H). Three weeks after the initiation of prednisone dosing, closed femur fractures were created on prednisone-exposed mice and the healthy control. Prednisone administration was continued for 9 weeks post-fracture, and X-ray imaging was performed weekly to monitor the fracture healing process until the mice were euthanized. Necropsy was performed after 9 weeks and the fractured femurs were isolated and processed at necropsy for micro-CT and biomechanical property analysis. Another 20 mice (control and GC-H, 10 mice/group) were used for histology and micro-CT analysis at early time point (2-week post fracture) with continued prednisone exposure.Results: The results showed that oral administration of prednisone for 3 months in this strain of mice could inhibit endochondral ossification and delay the healing process, especially hard callus formation (woven bone) and bone remodeling during healing. It also could significantly decrease bone biomechanical properties.Conclusion: Long-term GC administration leads to significantly delayed fracture healing and impaired bone biomechanical properties. This mouse model may be used to systematically study the cellular and molecular mechanisms underlying fracture healing with GC treatment background and may also be used to study the influence of different therapeutic interventions for bone fracture healing. Keywords: delayed healing, non-union, fracture, glucocorticoid, mouse, stiffness, toughness
format	article
author	Liu YZ Akhter MP Gao X Wang XY Wang XB Zhao G Wei X Wu HJ Chen H Wang D Cui L
author_facet	Liu YZ Akhter MP Gao X Wang XY Wang XB Zhao G Wei X Wu HJ Chen H Wang D Cui L
author_sort	Liu YZ
title	Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
title_short	Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
title_full	Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
title_fullStr	Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
title_full_unstemmed	Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
title_sort	glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice
publisher	Dove Medical Press
publishDate	2018
url	https://doaj.org/article/413d8a85e64444149da32ff099fc4513
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_version_	1718403432809758720

Glucocorticoid-induced delayed fracture healing and impaired bone biomechanical properties in mice

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