• 1. Department of Orthopaedics, 3201 Hospital of Xi’an Jiaotong University Health Science Center, Hanzhong Shaanxi, 723000, P.R.China;
  • 2. Department of Orthopaedics, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an Shaanxi, 710004, P.R.China;
JIAO Haibin, Email: jiaohaibin2001@163.com
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Objective To investigate whether exosomes derived from miR-27a-overexpressing human umbilical vein endothelial cells (HUVECs)—exo (miR-27a) can promote bone regeneration and improve glucocorticoids (GC) induced osteonecrosis of femoral head (ONFH) (GC-ONFH).Methods The exo (miR-27a) were intended to be constructed and identified by transmission electron microscopy, nanoparticle tracking analysis, Western blot, and real-time fluorescent quantitative PCR (qRT-PCR). qRT-PCR was used to evaluate the effect of exo (miR-27a) in delivering miR-27a to osteoblasts (MC3T3-E1 cells). Alkaline phosphatase staining, alizarin red staining, and qRT-PCR were used to evaluate its effect on MC3T3-E1 cells osteogenesis. Dual-luciferase reporter (DLRTM) assay was used to verify whether miR-27a targeting Dickkopf WNT signaling pathway inhibitor 2 (DKK2) was a potential mechanism, and the mechanism was further verified by qRT-PCR, Western blot, and alizarin red staining in MC3T3-E1 cells. Finally, the protective effect of exo (miR-27a) on ONFH was verified by the GC-ONFH model in Sprague Dawley (SD) rats.Results Transmission electron microscopy, nanoparticle tracking analysis, Western blot, and qRT-PCR detection showed that exo (miR-27a) was successfully constructed. exo (miR-27a) could effectively deliver miR-27a to MC3T3-E1 cells and enhance their osteogenic capacity. The detection of DLRTM showed that miR-27a promoted bone formation by directly targeting DDK2. Micro-CT and HE staining results of animal experiments showed that tail vein injection of exo (miR-27a) improved the osteonecrosis of SD rat GC-ONFH model.Conclusion exo (miR-27a) can promote bone regeneration and protect against GC-ONFH to some extent.

Citation: ZHANG Gensheng, LIU Ruiyu, DANG Xiaoqian, LIU Jichao, JIAO Haibin. Experimental study on improvement of osteonecrosis of femoral head with exosomes derived from miR-27a-overexpressing vascular endothelial cells. Chinese Journal of Reparative and Reconstructive Surgery, 2021, 35(3): 356-365. doi: 10.7507/1002-1892.202011026 Copy

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