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The scattered cell clusters that can differentiate into hepatocytes or biliary epithelial cells have been isolated from primary cultures of adult porcine livers. We have generated 11 clonal cell lines from this system and identified liver progenitor cells (LPCs) among the clonal lines. These clonal lines expressed c-kit, HNF-1, HNF-6, and/or CK19 mRNA. An immunocytochemical study of the clonal lines indicated that clonal line CL-11 expressed liver epithelial cell markers CK14, vimentin, CK18, and BD-1. The expression of albumin and α1-antitrypsin (α1-AT) mRNA was only upregulated in CL-11 among the clonal lines when they were grown as aggregates. Under these conditions, CL-11 also exhibited ammonia metabolic activity and several indicators that suggest hepatocytic differentiation, including the upregulation of liver-specific genes such as dipeptidyl peptidase IV, CYP1A1, and CYP3A4 mRNA, and the downregulation of biliary cell markers such as -glutamyltrans-peptidase (GGT), CK19, and HNF6 mRNA. After culturing CL-11 in Matrigel, the expression of GGT and HNF6 mRNA was upregulated. These results indicate that CL-11 has dual potential: the ability to differentiate as hepatocytes or as bile duct cells. The isolation of scattered cells could provide a simple method to generate LPC lines from adult livers.
Department of Liver Cell Biology, Kohno Clinical Medicine Research Institute, Tokyo 140-0001, Japan 2:
Kita-Shinagawa Hospital, Kohno Clinical Medicine Research Institute, Tokyo 140-0001, Japan 3:
Department of Innovative Surgery, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
Publication date: January 1, 2008
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Cell Transplantation publishes original, peer-reviewed research and review articles on the subject of cell transplantation and its application to human diseases. To ensure high-quality contributions from all areas of transplantation, separate section editors and editorial boards have been established. Articles deal with a wide range of topics including physiological, medical, preclinical, tissue engineering, and device-oriented aspects of transplantation of nervous system, endocrine, growth factor-secreting, bone marrow, epithelial, endothelial, and genetically engineered cells, among others. Basic clinical studies and immunological research papers are also featured. To provide complete coverage of this revolutionary field, Cell Transplantation will report on relevant technological advances, and ethical and regulatory considerations of cell transplants. Cell Transplantation is now an Open Access journal starting with volume 18 in 2009, and therefore there will be an inexpensive publication charge, which is dependent on the number of pages, in addition to the charge for color figures. This will allow work to be disseminated to a wider audience and also entitle the corresponding author to a free PDF, as well as prepublication of an unedited version of the manuscript.