Received for publication 17 August 2006
Accepted in revised form 6 October 2006
Islet-Derived Fibroblast-Like Cells Are Not Derived Via Epithelial-Mesenchymal Transition From Pdx-1 or Insulin-Positive Cells
Lucas G. Chase 1 , Fernando Ulloa-Montoya 1 , Benjamin L. Kidder 1 , and Catherine M. Verfaillie 1
From the
1 Stem Cell Institute, University of Minnesota, Minneapolis, Minnesota.
As recent studies suggest that newly formed pancreatic
-cells are a result of self-duplication rather than stem cell differentiation, in vitro expansion of
-cells presents a potential mechanism by which to increase available donor tissue for cell-based diabetes therapies. Although most studies have found that
-cells are resilient to substantial in vitro expansion, recent studies have suggested that it is possible to expand these cells through a process referred to as epithelial-mesenchymal transition (EMT). To further substantiate such an expansion mechanism, we used recombination-based genetic lineage tracing to determine the origin of proliferating fibroblast-like cells from cultured pancreatic islets in vitro. We demonstrate, using two culture methods, that EMT does not underlie the appearance of fibroblast-like cells in mouse islet cultures but that fibroblast-like cells appear to represent mesenchymal stem cell (MSC)-like cells akin to MSCs isolated from bone marrow.