【摘 要】
：
AIM: To establish a model of islet-ductal cell bansdifferentiation to identify the transdifferentiated cells. METHODS: Collagen was extracted from rat tail at f
【机 构】
：
Department of Biochemistry
【基金项目】
：
the National Natural Science Foundation of China
论文部分内容阅读
AIM: To establish a model of islet-ductal cell bansdifferentiation to identify the transdifferentiated cells. METHODS: Collagen was extracted from rat tail at first. Purified rat islets were divided into three groups, embedded in collagen gel and incubated respectively in DMEM/F12 alone (control group), DMEM/F12 plus epidermal growth factor (EGF), DMEM/F12 plus EGF and cholera toxin (CT). Transdifferentiation was proved by microscopy, RT-PCR, immunohistochemistry and RIA.RESULTS: Islets embedded in collagen gel plus EGF and CT were cystically transformed and could express new gene cytokeratin 19 while still maintaining the expression of insulin and Pdx-1 genes. Immunohistochemistry demonstrated that the protein of cytokeratin 19 was only expressed in the third group. The insulin content secreted by islets in thethird group decreased significantly during the transdifferentiation.CONCLUSION: CT is a crucial factor for the islet-ductal cell transdifferentiation.
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