Rabbit Normal Regenerating Pancreas Extract induces rat BM-MSCs into Pancreatic Islet-like Structure Cells in vitro

Bone marrow mesenchymal stem cells (BM-MSCs) could differentiate into Insulin Producing Cells(IPCs) with notable advantages. The present study tried to develop a method may be able to use a normal regenerating pancreas extract(N-RPE) medium to induce BM-MSCs into islet phenotype, in tests to assess how efficient method and simple duplicate the novel condition medium protocol is. Isolate and purify MSCs from rat bone marrow. BM-MSCs were differentiated into Adipogenic, Osteogenic and Myocardium and the lineages were assessed its multi-lineage potential. Islet differentiation medium, blending rabbit conditioned medium N-RPE, was administered to rat BM-MSCs. After 15 days, differentiation was evaluated by lineage-specific morphology and three stages could be observed: induced cells, islet like cells(ILCs) and islet like structures(ILSs). The morphology, SEM, DTZ staining, Mallory staining, HE staining and glucose stimulation demonstrated that the N-RPE could stimulate suitable development microenvironment to supply the islet differentiate from BM-MSCs. In addition, islet-related genes (ins/glu) expression and proteins(insulin/glucagon) expression suggested that culture medium rabbit N-RPE enhanced the rat BM-MSCs transdifferentiation efficiency. N-RPE derived from normal pancreas tissue could promote pancreas development of microenvironment and significantly enhance the transdifferentiation of BM-MSCs into ILSs. Results from this work will contribute to optimize the conditions of BM-MSCs and supply a new strategy for the development of islet tissue engineering.