Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (1): 119-124.doi: 10.3969/j.issn.2095-4344.2014.01.020

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Mononuclear cells promote mesenchymal stem cell migration after myocardial infarction

Zhang Ying1, Liao Li-qiang1, Zhang Xiao-gang2   

  1. 1People’s Hospital of Yubei District, Chongqing 401120, China
    2First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
  • Revised:2013-10-17 Online:2014-01-01 Published:2014-01-01
  • Contact: Liao Li-qiang, Master, Physician, People’s Hospital of Yubei District, Chongqing 401120, China
  • About author:Zhang Ying, Master, Physician, People’s Hospital of Yubei District, Chongqing 401120, China

Abstract:

BACKGROUND: The mechanisms of mesenchymal stem cells directionally homing to infarcted myocardium post myocardial infarction are still unclear.
OBJECTIVE: To investigate the role of stromal cell derived factor-1 (SDF-1)/C-X-C chemokine receptor 4 (CXCR4) axis on mesenchymal stem cell migration promoted by mononuclear cells after myocardial infarction.
METHODS: Cardiomyocytes and mesenchymal stem cells were respectively isolated from suckling and adult Sprague-Dawley rats. Twelve healthy Sprague-Dawley rats were selected (six rats for myocardial infarction models and six for sham models), then circulating mononuclear cells were isolated. 4,6-Diamino-2-phenyl indole-labeled mesenchymal stem cells, cardiomyocytes and mononuclear cells were cultured into the upper, middle and lower layers of the tri-chamber coculture system, respectively. In this experiment, there were four groups: myocardial infarction group, AMD3100 (CXCR4 inhibitor) group, sham group and blank control group. After 48 hours, the number of migrating mesenchymal stem cells with blue-lighting nucleus was calculated under fluoroscope. Immunocytochemistry and immunofluorescent staining was used to detect SDF-1 expression in cardiomyocytes and CXCR4 expression in mesenchymal stem cells, respectively.
RESULTS AND CONCLUSION: Migrating mesenchymal stem cells with positive expression of CXCR4 were observed in each group other than the blank control group. The number of migrating mesenchymal stem cells  was higher in the myocardial infarction group than in the other groups. Tumor necrosis factor-α neutralizing antibody and CXCR4 inhibitor AMD3100 could obviously reduce the number of migrating mesenchymal stem cells (P < 0.05). Cardiomyocytes in each group expressed SDF-1 positively. The gray values of SDF-1 expression in the myocardial infarction and AMD3100 groups were significantly higher than those in the sham and blank control groups  (P < 0.05). SDF-1/CXCR4 axis plays a certain role in mesenchymal stem cells migration promoted by mononuclear cells after myocardial infarction.


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


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Key words: mesenchymal stem cells, monocytes, receptors, chemokine, myocaridal ischemia, cell movement

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