体外PLGA三维支架上诱导小鼠骨髓干细胞向胰岛样细胞分化

In vitro differentiation of islet-like cells from mouse bone-marrow stem cells on a PLGA scaffold

目的 研究聚乳酸-羟基乙酸（PLGA）三维支架在骨髓干细胞向胰岛样细胞诱导分化中的作用.方法 分别在平面和PLGA三维支架上对小鼠骨髓干细胞向胰岛样细胞进行诱导分化,对2组诱导分化的胰岛样细胞进行形态学观察和功能检测,对照组为小鼠胰岛细胞.结果 2组诱导分化的胰岛样细胞均呈双硫腙（DTZ）染色阳性,胰岛素、C肽双染阳性,胰高血糖素阳性和生长抑素阳性;在高糖刺激下,PLGA三维支架组的胰岛素分泌量较平面组显著提高（P＜0.01）.电镜提示诱导分化的胰岛样细胞具有类似β细胞的超微结构且与支架有良好的相容性.结论 PLGA三维支架有益于提高骨髓干细胞诱导分化的胰岛样细胞功能,且与胰岛样细胞具有良好的相容性.

Objective To investigated the potential influences of poly（lactic-co-glycolicacid）（PLGA）scaffold as a platform on the differentiation of mouse bone-marrow stem cells to islet-like cells.Methods Mouse bonemarrow stem cells were grown and differentiated in culture with or without PLGA scaffold,and cell morphology and functions were compared within these groups.Results The PLGA scaffold showed fine biological compatibility.Differentiated islet-like cells were dithizone （DTZ） positive,insulin and C-peptide double positive,glucagon positive and somatostatin positive in both groups.Under electron microscope there were ultrastructures similar to that of islet β cells in cells of both groups.Cells with PLGA scaffold secreted more insulin under high level glucose stimulation （P＜0.01）.Conclusions PLGA scaffold was biologically compatible and improved function of the differentiated islet-like cells.