Abstract
As a regulator of osteogenesis, microRNA-218 (miR-218) is reported to promote osteogenesis of mesenchymal stem cells (MSCs). However, the in vivo osteogenic effect of miR-218 remains elusive. In this study, miR-218 was confirmed to promote osteogenic differentiation of MSCs by stimulating the alkaline phosphatase activity, calcium nodule formation, and osteogenic marker gene expression. For in vivo study, the miR-218-overexpressing BMSCs were locally administrated into the fracture sites in a femur fracture mouse model. Based on the X-rays, micro-computed tomography, mechanical testing, histology, and immunohistochemistry examinations, miR-218 overexpression improved new bone formation and accelerated fracture healing. These findings suggest that miR-218 may be a promising therapeutic target for bone repair in future clinical applications.
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Acknowledgements
The work was partially supported by grants from Research Grants Council of the Hong Kong SAR, China (Project No. 14119115, 14160917, N_CityU102/15, T13-402/17-N); National Natural Science Foundation of China (81772404, 81430049, and 81772322); Hong Kong Innovation Technology Commission Funds (ITS/UIM-305). This study was also supported in part by SMART program, Lui Che Woo Institute of Innovative Medicine.
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JZ and GL designed and supervised all the experiments; LS, LF, and YL conducted experiments, analyzed the data, and prepared the manuscript. JD and WL analyzed the IHC staining blindly. All authors reviewed and approved the manuscript.
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Liu Shi, Lu Feng, Yang Liu, Ji-qiang Duan, Wei-ping Lin, Jin-fang Zhang, and Gang Li declare that none of them have any conflict of interest.
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The animal experiemts were carried out with full ethical approval of The Chinese University of Hong Kong animal ethical committee accorign to the laws and regulations for animal experiemts of Hong Kong.
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Shi, L., Feng, L., Liu, Y. et al. MicroRNA-218 Promotes Osteogenic Differentiation of Mesenchymal Stem Cells and Accelerates Bone Fracture Healing. Calcif Tissue Int 103, 227–236 (2018). https://doi.org/10.1007/s00223-018-0410-8
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DOI: https://doi.org/10.1007/s00223-018-0410-8