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BioMed Research International
Volume 2015, Article ID 412327, 9 pages
Research Article

mir-21 Overexpressing Mesenchymal Stem Cells Accelerate Fracture Healing in a Rat Closed Femur Fracture Model

1Department of Orthopaedics & Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
2Stem Cells and Regenerative Medicine Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
3The CUHK-ACC Space Medicine Centre, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen 518000, China
4Department of Orthopaedic Surgery, Baoan Hospital of Southern Medical University, The 8th People’s Hospital, Shenzhen 518000, China
5MOE Key Laboratory for Regenerative Medicine, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong

Received 4 November 2014; Revised 15 February 2015; Accepted 15 February 2015

Academic Editor: Jeroen Rouwkema

Copyright © 2015 Yuxin Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


MicroRNAs are small noncoding RNAs involved in numerous biological processes. Emerging pieces of evidence suggest that microRNAs play important roles in osteogenesis and skeletal homeostasis. Recent studies indicated the significant regulation function of mir-21 in osteogenesis in vitro, but little information is known about its veritable functions in vivo. In the present study, we aimed to investigate the effect of mir-21 intervention on osteogenic differentiation of rats bone marrow derived mesenchymal stem cells (rBMSCs) and repair capacity in rats closed femur fracture model with internal fixation. The results showed that the upregulation of mir-21 not only increased the expression of osteopontin and alkaline phosphatase in rBMSCs but also promoted mineralization in the condition of osteogenic induction. Furthermore, the bone healing properties were also improved in fracture healing model according to the results of micro-CT, mechanical test, and histological analysis. The current study confirms that the overexpression of mir-21 could promote osteogenesis and accelerate bone fracture healing, which may contribute to a new therapeutic way for fracture repair.