Pancreatic Duct Cells Isolated From Canines Differentiate Into Beta-Like Pancreatic Islet Cells

In this study, we isolated and cultured pancreatic ductal cells from canines and revealed the possibility for using them to differentiate into functional pancreatic beta cells in vitro. Passaged pancreatic ductal cells were induced to differentiate into beta-like pancreatic islet cells using a mixture of induced factors. Differentiated pancreatic ductal cells were analyzed based on intracellular insulin granules using transmission electron microscopy, the expression of insulin and glucagon using immunofluorescence, and glucose-stimulated insulin secretion using ELISA. Our data revealed that differentiated pancreatic ductal cells not only expressed insulin and glucagon but also synthesized insulin granules and secreted insulin at different glucose concentrations. Our study might assist in the development of effective cell therapies for the treatment of type 1 diabetes mellitus in dogs.

The Role of Mesenchymal Stem Cells in Regulating PDGF and VEGF during Pancreatic Islet Cells Regeneration in Diabetic Animal Model

Introduction: Diabetes is a heterogeneous group of metabolic diseases characterized by elevated blood glucose due to autoimmune disorder or a combination of insulin resistance and insulin deficiency. VEGF and PDGF are the main actors in the regeneration of damaged pancreatic tissue. However, the prolonged release of these molecules may induce fibrosis formation. Mesenchymal stem cells (MSCs) have a high potential to regenerate damaged pancreatic tissue by releasing PDGF and VEGF. Aim: This study aimed to investigate the effect of MSCs on the levels of PDGF and VEGF on days 2 and 44 in diabetic mice and determine the number of pancreatic islet cells and blood glucose levels. Materials and methods: This study used a post-control group design with animals divided into five groups: sham, control, and three treatment groups (P) which were given MSCs at doses of 1.5×105, 3×105, and 6×105 cells. The levels of PDGF, VEGF, and blood glucose were measured by enzyme-linked immunosorbent assay (ELISA), while the number of pancreatic islet cells was analyzed using H&E staining. Results: This study showed a significant increase of VEGF and PDGF levels on day 2 and a significant increase in islet cell percentages on day 44 in line with the decreased blood glucose level. However, there was no difference between VEGF and PDGF levels on day 44. Conclusions: MSCs regulate PDGF and VEGF levels in wound healing phases and remodel pancreatic islet β-cells regeneration to control blood glucose in diabetic model mice.