Published online Jun 14, 2005. doi: 10.3748/wjg.v11.i22.3426
Revised: July 3, 2004
Accepted: September 9, 2004
Published online: June 14, 2005
AIM: To establish a model of islet-ductal cell transdifferen-tiation 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 the third group decreased significantly during the transdiffe-rentiation.
CONCLUSION: CT is a crucial factor for the islet-ductal cell transdifferentiation.