ABSTRACT
BACKGROUND: Transplanting islet-like cells induced by human umbilical cord mesenchymal stem cells (hUC-MSCs) into type 1 diabetic mice can reduce blood glucose level and improve the symptoms of diabetes mellitus. However, there are few reports on intraperitoneal transplantation. OBJECTIVE: To study the therapeutic effect of transplantation of islet-like cells induced by hUC-MSCs in different ways for the treatment of type 1 diabetic mice. METHODS: The hUC-MSCs were isolated and cultured by tissue explants adherent method and differentiated into islet-like cells. The 3 of 15 male C57BL/6J mice were used as normal group, and the remaining mice were taken to prepare a mouse model of type 1 diabetes using intraperitoneal injection of streptozotocin. After successful modeling, nine model mice were randomly divided into diabetes group, tail vein-islet-like cells group, and abdomen-islet-like cells group, with three mice in each group. After 10 days of modeling, the normal group and diabetic group were not treated. The tail vein-islet-like cells group was injected with 5×105 cells/0.4 mL islet-like cells via the tail vein and the abdomen-islet-like cells group was intraperitoneally injected with 5×105 cells/0.4 mL islet-like cells. During the treatment, the blood glucose and insulin levels were measured twice a week; glucose tolerance test was performed at 28 days after cell transplantation; and fasting insulin level was detected at 42 days after cell transplantation. RESULTS AND CONCLUSION: (1) Compared with the diabetic group, in the tail vein-islet-like cells group, the blood glucose level began to decrease on the 10th day after transplantation and maintained until the 31st day, and the insulin level and glucose tolerance significantly improved (P < 0.05). However, there was no significant improvement in blood glucose level, insulin level and glucose tolerance in the abdomen-islet-like cells group. (2) To conclude, transplantation of hUC-MSCs induced islet-like cells for the treatment of type 1 diabetic mice via tail vein is an ideal transplantation method, and the effect of intraperitoneal injection is unsatisfactory.
ABSTRACT
Glycemic excursion was induced in SD rats by intraperitoneal injection of 50% glucose solution, and cells isolated from bone marrow of these rats showed cell clusters which expressed insulin, c-peptide, glucagon, somatostatin and islet amyloid polypeptide, and other genes related to islet-cells development and functions.
ABSTRACT
The present study demonstrated that bone marrow cells from diabetic rats were able to form cell clusters expressing insulin,C-peptide,glucagon,somatostatin and islet amyloid .polypeptide,and other genes associated with development and function of islets such as glucose transporter-2,glucokinase,glucagon-like peptide-1 receptor,PDX-1,Ngn3,NeuroDl,Pax-6 and NKX2.2 genes.These islet-like cells might be derived from adult stem cells in bone marrow.