title: Isolation and characterization of adult human liver progenitors from ischemic liver tissue derived from therapeutic hepatectomies.
abstract: Recent evidence suggests that progenitor cells in adult tissues and embryonic stem cells share a high resistance to hypoxia and ischemic stress. To study the ischemic resistance of adult liver progenitors, we characterized remaining viable cells in human liver tissue after cold ischemic treatment for 24-168 h, applied to the tissue before cell isolation. In vitro cultures of isolated cells showed a rapid decline of the number of different cell types with increasing ischemia length. After all ischemic periods, liver progenitor-like cells could be observed. The comparably small cells exhibited a low cytoplasm-to-nucleus ratio, formed densely packed colonies, and showed a hepatobiliary marker profile. The cells expressed epithelial cell adhesion molecule, epithelial-specific (CK8/18) and biliary-specific (CK7/19) cytokeratins, albumin, alpha-1-antitrypsin, cytochrome-P450 enzymes, as well as weak levels of hepatocyte nuclear factor-4 and gamma-glutamyl transferase, but not alpha-fetoprotein or Thy-1. In vitro survival and expansion was facilitated by coculture with mouse embryonic fibroblasts. Hepatic progenitor-like cells exhibit a high resistance to ischemic stress and can be isolated from human liver tissue after up to 7 days of ischemia. Ischemic liver tissue from various sources, thought to be unsuitable for cell isolation, may be considered as a prospective source of hepatic progenitor cells.
authors.affiliation: Division of Experimental Surgery, Department of Surgery, Charité-Universitätsmedizin Berlin Campus Virchow-Klinikum, Berlin, Germany. harald.stachelscheid@charite.de
authors.forename: Harald
authors.initials: H
authors.lastname: Stachelscheid
authors.forename: Thomas
authors.initials: T
authors.lastname: Urbaniak
authors.forename: Alexander
authors.initials: A
authors.lastname: Ring
authors.forename: Berlind
authors.initials: B
authors.lastname: Spengler
authors.forename: Jörg C
authors.initials: JC
authors.lastname: Gerlach
authors.forename: Katrin
authors.initials: K
authors.lastname: Zeilinger
mesh_terms: D000328:Adult; D000818:Animals; D002454:Cell Differentiation; D049109:Cell Proliferation; D002469:Cell Separation / Q000379:methods*; D048430:Cell Shape; D018920:Coculture Techniques; D004622:Embryo, Mammalian / Q000166:cytology; D005347:Fibroblasts / Q000166:cytology; D005455:Fluorescent Antibody Technique; D005786:Gene Expression Regulation; D006498:Hepatectomy; D022781:Hepatocytes / Q000166:cytology; D006801:Humans; D007511:Ischemia / Q000473:pathology*; D008099:Liver / Q000098:blood supply* / Q000473:pathology*; D051379:Mice; D008858:Microscopy, Phase-Contrast; D010641:Phenotype; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism; D013997:Time Factors