Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (28): 4465-4471.doi: 10.3969/j.issn.2095-4344.2015.28.008

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Migration and homing of bone marrow mesenchymal stem cells in segmental nerve injury

Zhou Xue-feng1, Ren Zhi-wu2, Lu Ming1, Wang Yu2, Sun Zhen2, Peng Jiang2   

  1. 1the 306th Hospital of PLA, Beijing 100101, China;
    2General Hospital of PLA, Beijing 100853, China
  • Online:2015-07-02 Published:2015-07-02
  • Contact: Peng Jiang, M.D., Associate professor, General Hospital of PLA, Beijing 100853, China
  • About author:Zhou Xue-feng, Master, Associate chief physician, the 306th Hospital of PLA, Beijing 100101, China
  • Supported by:

    the 973 Program of the Ministry of Technology, No. 2014CB542201; the Special Scientific Fund of Beijing, No. Z141107004414044

Abstract:

 BACKGROUND: A large number of studies have confirmed that tissue-engineered stem cell therapy is feasible to repair peripheral nerve injury, but the repair mechanism is unclear.

OBJECTIVE: To observe the differentiation and homing of bone marrow mesechnymal stem cells under local nerve microenvironment by exploring the migration and effect of bone marrow mesenchymal stem cells in the repair of damaged nerve.
METHODS: Male SD rats, aged 8 weeks, were selected to establish segmental nerve injury models by freezing the sciatic nerve. Thirty-six model rats were randomized into three groups (n=12): frozen nerve injury group, cell injection into the nerve group, cell injection around the nerve group. Before modeling and at 4, 8, 12 weeks after cell implantation, the sciatic nerve function index was measured. Electrophysiological test, contractility recovery rate, wet weight recovery rate of the triceps surae were detected and Masson staining was performed; toluidine blue staining of the distal nerve injury and immunofluorescence staining of the damaged nerve were performed.
RESULTS AND CONCLUSION: At 4, 8, 12 weeks after cell implantation, the sciatic nerve function index was ranked as follows: frozen nerve injury group < cell injection around the nerve group < cell injection into the nerve group, but no significant difference was found among the three groups. Electrophysiological results showed that there was no difference in the latency and amplitude of compound muscle action potential between two cell therapy groups, but compared with the frozen nerve injury group, the latency was shorter and the amplitude was higher in the two cell therapy groups (P < 0.05). Cross-sectional area of the muscle fibers was lower in the frozen nerve injury group compared with the other two groups. Immunofluorescence staining showed that Nestin, S100 and P0 proteins were all expressed in the two cell therapy groups 12 weeks after cell implantation. These findings indicate that bone marrow mesenchymal stem cells added into the surrounding tissues of segmental damaged nerve can migrate into the damaged nerve, and even differentiate into Schwann cells and neural stem cells, which has a similar effect to the cell injection into the damaged cells. 

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

Key words: Sciatic Nerve, Trauma, Nervous System, Bone Marrow, Mesenchymal Stem Cell Transplantation

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