Document Type

Journal Article

Authors

Y. X. He, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
Z. Liu, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
X. H. Pan, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
T. Tang, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
B. S. Guo, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
L. Z. Zheng, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
X. H. Xie, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
X. L. Wang, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
K. M. Lee, Lee Hysan Clinical Research Laboratory, Chinese University of Hong Kong
G. Li, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
Y. P. Cao, Department of Orthopedics, Peking University First Hospital
L. Wei, Department of Orthopaedics, Warren Alpert Medical School, Brown University
Y. Chen, Department of Orthopedics, Shenzhen Second People's Hospital
Z. J. Yang, School of Chinese Medicine, Hong Kong Baptist UniversityFollow
L. K. Hung, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
L. Qin, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong
G. Zhang, Musculoskeletal Research Laboratory, Department of Orthopedics and Traumatology, Chinese University of Hong Kong

Department/Unit

School of Chinese Medicine

Title

Deletion of estrogen receptor beta accelerates early stage of bone healing in a mouse osteotomy model

Language

English

Abstract

Summary This study examined the role of estrogen receptor (ER) beta during mouse femoral fracture healing by employing ER knockout (KO) mice. The fracture healing in KO mice was enhanced in the early stage of neovascularization and the middle stage of endochondral ossification. Introduction This study was conducted to examine the role of ER beta during fracture healing. Methods Female ERbeta knockout (KO) mice (18 weeks old) and age-matched female wild-type (WT) mice underwent open osteotomy on the right femur. They were sacrificed at 1, 2, 4 and 6 weeks post-fracture. The sera and callus samples were subjected to the following analyses: micro-computed tomography (CT)-based angiography, micro-CT evaluation, histological examination, histomorphometry examination, real-time polymerase chain reaction (PCR) analysis, biochemical marker, and mechanical testing. Results Micro-CT-based angiography showed that the total vessel volume at the fracture site was larger in the KO group than the WT group at 1 and 2 weeks post-fracture. Micro-CT analysis revealed that the callus volume was significantly higher in the KO group from week 2 to week 4 post-fracture when compared with the WT group consistent with the histological data. Analysis of biochemical markers indicated that circulating P1NP levels in the KO mice were significantly higher than in the WT mice from week 2 to week 4 and that temporal expression of circulating C-terminal telopeptide of type I collagen (CTX) levels was also higher in the KO mice than in the WT mice. These results were consistent with quantitative real-time PCR analysis. The ultimate load, stiffness, and energy to failure were significantly higher in the KO mice than in theWT mice at week 4. Conclusions The fracture healing in KO mice was enhanced in the early stage of neovascularization and the middle stage of endochondral ossification, but not by the end of healing. Blockade of ERbeta can be considered as another therapeutic strategy for osteoporotic fracture and non-union fracture. © International Osteoporosis Foundation and National Osteoporosis Foundation 2011.

Keywords

Estrogen receptor beta, Fracture, Mice, Micro-CT

Publication Date

2012

Source Publication Title

Osteoporosis International

Volume

23

Issue

1

Start Page

377

End Page

389

Publisher

Springer Verlag

DOI

10.1007/s00198-011-1812-x

Link to Publisher's Edition

http://dx.doi.org/10.1007/s00198-011-1812-x

ISSN (print)

0937941X

ISSN (electronic)

14332965

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