Chinese Journal of Tissue Engineering Research ›› 2018, Vol. 22 ›› Issue (5): 692-697.doi: 10.3969/j.issn.2095-4344.0437

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3D-cultured umbilical cord mesenchymal stem cells for treatment of type 1 diabetes: therapeutic effects and immunomodulatory mechanism

Liu Ke-na1, Li Dong2, Yang Guang-sheng1   

  1. 1Clinical Laboratory, Binzhou City Hospital of Traditional Chinese Medicine, Binzhou 256613, Shandong Province, China; 2Cryomedicine Laboratory, Qilu Hospital of Shandong University, Jinan 250012, Shandong Province, China
  • Revised:2017-09-13 Online:2018-02-18 Published:2018-02-18
  • Contact: Yang Guang-sheng, Associate chief laboratorian, Clinical Laboratory, Binzhou City Hospital of Traditional Chinese Medicine, Binzhou 256613, Shandong Province, China
  • About author:Liu Ke-na, Laboratorian in charge, Clinical Laboratory, Binzhou City Hospital of Traditional Chinese Medicine, Binzhou 256613, Shandong Province, China

Abstract:

BACKGROUND: Umbilical cord mesenchymal stem cells (UC-MSCs) can differentiate into islet beta cells for type 1 diabetes mellitus therapy; however, it is necessary to further improve the therapeutic effect and study its immunomodelatory mechanism.
OBJECTIVE: To investigate the therapeutic effect and immunomodulatory mechanism of 3D cultured UC-MSCs in type 1 diabetes mellitus mice.
METHODS: UC-MSCs were separated by tissue-attached method and cultured in 3D system. Cell morphology was detected by scanning electron microscope and surface markers were assayed by flow cytometry. A mouse model of type 1 diabetes mellitus was made via injection of streptozotocin. Mice in stem cell transplantation group were given injection of UC-MSCs on the 7th day after modeling, and those in model group and control group were injected the same volume of normal saline. Fasting blood glucose level in each group was detected once a week, for continuous 4 weeks. Mouse spleen mononuclear cells suspension was prepared at the 30th day after injection, T cell subset changes were detected by flow cytometry, and expression levels of serum cytokines, interleukin (IL)-4, IL-10, IL-2 and interferon-γ were measured by ELISA kits.
RESULTS AND CONCLUSION: (1) UC-MSCs cultured in the 3D system grew well and highly expressed surface markers CD44, CD73, CD90, CD105. (2) The blood glucose level was reduced significantly at 2-4 weeks after stem cell injection, and there was a significant difference compared with the model group (P < 0.05). The blood glucose level in the 3D cultured stem cell transplantation group was lower than that in the 2D cultured stem cell transplantation group, and there was significant difference at the 4th week (P < 0.05). (3) Compared with the model group, Th1 cell percentage declined, Th2 cell and Treg percentages increased significantly in the stem cell transplantation group  (P < 0.01); compared with the 2D cultured stem cell transplantation group, Th1 cell percentage declined, Th2 cell and Treg percentages increased significantly in the 3D cultured stem cell transplantation group (P < 0.05). (4) Compared with the model group, the levels of IL-2 and interferon-γ in the stem cell transplantation group decreased, while the levels of IL-4 and IL-10 increased significantly; compared with the 2D system stem cell transplantation group, the IL-2 level in 3D system stem cell transplantation group decreased, while the levels of IL-4 and IL-10 increased significantly (P < 0.05). These results indicate that 3D cultured stem cell transplantation in the treatment of type 1 diabetes mice has better curative effects than 2D cultured stem cell transplantation, and the possible mechanism may be related to upregulate Treg cells and maintain Th1/Th2 balance in the body. 

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: Umbilical Cord, Mesenchymal Stem Cell Transplantation, Diabetes Mellitus, Type 1, Blood Glucose, Immunomodulation, Tissue Engineering

CLC Number: