Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (25): 4013-4018.doi: 10.12307/2021.013

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Macrophage migration inhibition factor promotes bone marrow mesenchymal stem cells homing to repair acute knee cartilage injury

Lu Dinggui, Yao Shunhan, Tang Qianli, Tang Yujin   

  1. Affiliated Hospital of Youjiang Medical College for Nationalities, Baise 533000, Guangxi Zhuang Autonomous Region, China
  • Received:2020-09-02 Revised:2020-09-04 Accepted:2020-10-16 Online:2021-09-08 Published:2021-03-27
  • Contact: Tang Yujin, MD, Chief physician, Affiliated Hospital of Youjiang Medical College for Nationalities, Baise 533000, Guangxi Zhuang Autonomous Region, China
  • About author:Lu Dinggui, MD, Associate chief physician, Affiliated Hospital of Youjiang Medical College for Nationalities, Baise 533000, Guangxi Zhuang Autonomous Region, China
  • Supported by:
    Basic Ability Improvement Project of Young and Middle-Aged Teachers from Guangxi Colleges and Universities, No. 2018KY0449 (to LDG); Self-Financing Scientific Research Project of Health and Family Planning Commission of Guangxi Zhuang Autonomous Region, No. Z20170243 (to LDG); Scientific Research and Technology Development Plan Project of Baise City, No. 20170512 (to LDG); Guangxi Key Research and Development Project, No. A18050008 (to TYJ) 

Abstract: BACKGROUND: Cartilage lacks blood vessels and nerves, so its ability to repair itself is limited. The main method of young people’s cartilage repair is subchondral bone drilling and microfracture surgery. The purpose is to open up the subchondral bone plate and make bone marrow mesenchymal stem cells home to the injured area. Bone marrow mesenchymal stem cells differentiate into chondrocytes and fibroblasts to play a repair role. The growth rate of cartilage after microfracture surgery depends on the number of stem cells in the injured area. Therefore, increasing the number of stem cells homing can increase the chance of successful surgery. 
OBJECTIVE: To explore the effect of macrophage migration inhibition factor on bone marrow mesenchymal stem cells homing treatment of acute cartilage injury. 
METHODS:  Bone marrow mesenchymal stem cells were obtained from the bone marrow of the human femur, and then cultured. The ability of bone marrow mesenchymal stem cells to differentiate into chondrocytes was tested. The CXCR2 receptor expression of bone marrow mesenchymal stem cells and chondrocytes was measured by immunohistochemical method. The effect of macrophage migration inhibition factor on the migration kinetics of bone marrow mesenchymal stem cells was investigated by cell scratch test. A rat model of acute knee articular cartilage injury was made, and macrophage migration inhibition factor was injected intra-articularly at 1, 2, and 3 days after model establishment. Immunofluorescence staining and flow cytometry were used to detect the number of PECAM-1 positive cells (vascular endothelial cells) in the injured area, and DAPI staining was used to detect the number of monocytes in the damaged area.   
RESULTS AND CONCLUSION: (1) The surface markers of bone marrow mesenchymal stem cells were positive for CD166, CD29, and negative for CD34. (2) The CXCR2 antibody phenotype degenerated and disappeared after bone marrow mesenchymal stem cells differentiated into chondrocytes, while the phenotype expression of type 2 collagen antibody was positive. (3) Macrophage migration inhibition factor could promote the migration of bone marrow mesenchymal stem cells. After blocking the CXCR2 receptor of bone marrow mesenchymal stem cells, the effect of macrophage migration inhibition factor on promoting the migration of bone marrow mesenchymal stem cells was inhibited. (4) In animal models, the results of DAPI staining indicated that the number of nucleated cells in the injured area of the macrophage migration inhibition factor group was higher than that of the control group. Immunofluorescence staining and flow cytometry showed that the number of PECAM-1 positive cells in the repaired area of the macrophage migration inhibition factor group was higher than that of the control group. (5) The above results show that overexpression of macrophage migration inhibition factor promotes bone marrow mesenchymal stem cells to homing and repair acute cartilage damage. 

Key words: stem cells, bone marrow mesenchymal stem cells, macrophage migration inhibition factor, knee joint, cartilage injury, cell homing

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