title: Presence of markers for liver progenitor cells in human-derived intrahepatic biliary epithelial cells.
abstract: OBJECTIVE
  Rodent intrahepatic bile duct may harbor bipotential liver progenitor cells. In this study, human-derived intrahepatic biliary epithelial cells (BECs) were investigated in terms of whether they have the character of liver progenitor cells.
  
  
  METHODS
  Ten liver tissue specimens were obtained after partial hepatectomy or liver explantation. Intrahepatic BECs were isolated by density-gradient centrifugation and immunomagnetic separation using anti-human epithelial antigen and cultured in medium containing epidermal growth factor and hepatocyte growth factor. The isolated and cultured cells were characterized by immunostaining and reverse transcription polymerase chain reaction with a variety of markers for fetal hepatocytes and liver progenitor cells.
  
  
  RESULTS
  These cells had proliferated for up to 18 weeks in vitro. They continuously expressed epithelial markers (cytokeratin (CK) 8 and CK 18) as well as biliary markers (CK 7 and CK 19). Remarkably, some isolated and cultured cells also expressed markers for fetal hepatocytes and liver progenitor cells, including albumin, alpha-fetoprotein, alpha1-antitrypsin, c-kit and chromogranin-A.
  
  
  CONCLUSIONS
  Some human-derived intrahepatic BECs coexpressed markers for liver progenitor cells. This finding further supports the hypothesis that the human biliary tree may also consist of liver progenitor cells.
authors.affiliation: Department of Gastroenterology and Hepatology, University Hospital Essen, Essen, Germany.
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.forename: Thomas
authors.initials: T
authors.lastname: Schreiter
authors.forename: Olaf
authors.initials: O
authors.lastname: Dirsch
authors.forename: Guido
authors.initials: G
authors.lastname: Gerken
authors.forename: Karl J
authors.initials: KJ
authors.lastname: Oldhafer
authors.forename: Christoph E
authors.initials: CE
authors.lastname: Broelsch
authors.forename: Ulrich
authors.initials: U
authors.lastname: Treichel
mesh_terms: D000328:Adult; D001653:Bile Ducts, Intrahepatic / Q000166:cytology* / Q000473:pathology; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D004847:Epithelial Cells / Q000276:immunology / Q000473:pathology*; D005260:Female; D005455:Fluorescent Antibody Technique; D022781:Hepatocytes / Q000502:physiology; D006801:Humans; D008107:Liver Diseases / Q000473:pathology*; D008115:Liver Regeneration / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009024:Morphogenesis; D011336:Probability; D012016:Reference Values; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012680:Sensitivity and Specificity; D013234:Stem Cells / Q000276:immunology / Q000502:physiology*
chemical_list: D015415:Biomarkers