Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (25): 3976-3980.doi: 10.12307/2021.007

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Human placenta derived mesenchymal stem cell gel promotes the healing of radiation skin damage in SD rats

Xu Xiaoming1, Chen Yan1, Song Qian1, Yuan Lu1, Gu Jiaming1, Zhang Lijuan2, Geng Jie3, Dong Jian1   

  • Received:2020-07-07 Revised:2020-07-13 Accepted:2020-08-27 Online:2021-09-08 Published:2021-03-24
  • Contact: Dong Jian, Professor, Doctoral supervisor, Yunnan Tumor Research Institute, The Third Affiliated Hospital of Kunming Medical University/Yunnan Provincial Tumor Hospital/Yunnan Cellular Therapy and Quality Control System Engineering Research Center, Kunming 650118, Yunnan Province, China
  • About author:Xu Xiaoming, Master, Physician, Yunnan Tumor Research Institute, The Third Affiliated Hospital of Kunming Medical University/Yunnan Provincial Tumor Hospital/Yunnan Cellular Therapy and Quality Control System Engineering Research Center, Kunming 650118, Yunnan Province, China
  • Supported by:
    the Yunnan Key Laboratory of Cell Therapy Technology Translational Medicine, No. 2015DG034 (to DJ)

Abstract: BACKGROUND: Radiation skin injury has always been a difficult problem in clinical radiotherapy of tumors. A large number of experimental studies have shown that human placenta derived mesenchymal stem cells have the potential for epidermal cell differentiation and can promote the healing of wounded skin.
OBJECTIVE: To evaluate the effect of local application of human placenta derived mesenchymal stem cell gel on the healing of radiation skin damage in rats. 
METHODS:  Twenty-three Sprague-Dawley rats were randomly divided into three groups: negative control group (n=3), blank gel group (n=10) and mesenchymal stem cell gel group (n=10). Each group received skin irradiation of buttock and back (6 meV electron wire, total dose of 50 Gy, irradiation field of 3 cm×3 cm, single dose rate of 500 cGy/min). At 23 days after irradiation, the wounds of the mesenchymal stem cell gel group were smeared with human placenta derived mesenchymal stem cell gel. The blank gel control group was smeared with blank gel evenly, once a day, for six times. The negative control group was not given any treatment. The wound healing was observed once every four days. After 28 days of treatment, the effects of human placenta derived mesenchymal stem cell gel on inflammatory cells, wound microvessel density and wound collagen fibers were observed. 
RESULTS AND CONCLUSION: (1) The skin in the negative control group was swollen and ulcerated; the skin in the blank gel group was stiff and shrunken; and the wounds did not heal during the observation. The mesenchymal stem cell gel group developed new epithelial tissue in the irradiation area, and the wound healing was complete during the observation. (2) Compared with negative control and blank gel groups, at 16, 20, 24, and 28 days after treatment, the wound healing speed of the mesenchymal stem cell gel group was significantly faster (P < 0.05), and wound area was significantly reduced (P < 0.05); the count of inflammatory cells was lower (P < 0.05); count of CD31 cells in microvessel was significantly higher (P < 0.05); collagen fibers were arranged orderly. (3) The results indicate that local application of human placenta derived mesenchymal stem cell gel can promote the healing of radiation skin damage in SD rat. 

Key words: stem cells, human placenta derived mesenchymal stem cells, radiation skin damage, vascularization, healing, inflammation, collagen fiber, rat

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