title: Comparative phenotype and immunogenicity of freshly isolated and immortalized rat hepatocytes.
abstract: Immortalized hepatocytes are an attractive cell source for hepatocyte transplantation and gene transfer. We compared the phenotype and immunogenicity of freshly isolated (FIH) and immortalized (IMH) rat hepatocytes. Effect of culture and proinflammatory cytokines (TNF-alpha, IFN-gamma) was studied on phenotype. FIH were isolated by collagenase digestion. Two SV40 immortalized hepatocyte cell lines were tested (RH1 and P9). Immunophenotyping was performed by FACS analysis using anti-rat-specific antibodies. Immunogenicity was evaluated by a mixed lymphocyte hepatocyte reaction (MLHR). FIH suspension was an almost homogeneous parenchymal cell population with few (1-2%) CD8+ cells. FIH showed a positive staining for ICAM-1 (20-35%) and for Class I (RT1A, 30-60%) but no staining for Class II (RT1B). After 48 h of culture, the already ICAM-1-positive cells were more strongly stained and additionally 3.6% of the cells (possibly endothelial cells) were Class II positive. IMH showed a consistent expression of Class I (93-97%) and ICAM-1 (95-97%) but no expression of Class II. Culture of IMH for 48 h had no effect on Class II expression but increased ICAM-1 expression. Addition of TNF-alpha at 1000 UI/ml to cultures of FIH or IMH increased Class I and ICAM-1 expression whereas IFN-gamma (50 or 1000 UI/ml) had no evident effect. Hepatocyte immunogenicity, assessed in MLHR and appreciated by the stimulation index (SI) test/SI syngeneic control, was similar for IMH (RH1: 2.68+/-0.89; P9: 2.37+/-0.78) and FIH (2.52+/-0.18). In conclusion, despite some quantitative immunophenotypic differences, FIH and IMH induced the same proliferation rate of allogeneic T lymphocytes. Thus, immortalized hepatocytes may constitute an appropriate cellular model to study the prevention of hepatocyte rejection by gene transfer.
authors.affiliation: Laboratoire de Chirurgie Experimentale, Fondation Transplantation, Strasbourg, France.
authors.forename: V
authors.initials: V
authors.lastname: Kaulek
authors.forename: P
authors.initials: P
authors.lastname: Saas
authors.forename: E
authors.initials: E
authors.lastname: Alexandre
authors.forename: H
authors.initials: H
authors.lastname: Grant
authors.forename: L
authors.initials: L
authors.lastname: Richert
authors.forename: D
authors.initials: D
authors.lastname: Jaeck
authors.forename: P
authors.initials: P
authors.lastname: Tiberghien
authors.forename: P
authors.initials: P
authors.lastname: Wolf
authors.forename: A
authors.initials: A
authors.lastname: Azimzadeh
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000952:Antigens, Polyomavirus Transforming / Q000235:genetics; D002455:Cell Division; D002461:Cell Line, Transformed; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D022781:Hepatocytes / Q000737:chemistry* / Q000276:immunology* / Q000378:metabolism; D006649:Histocompatibility Antigens / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000032:analysis / Q000378:metabolism; D006650:Histocompatibility Testing; D016130:Immunophenotyping; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D007371:Interferon-gamma / Q000494:pharmacology; D008297:Male; D051381:Rats; D011914:Rats, Inbred BN; D011920:Rats, Inbred WF; D017207:Rats, Sprague-Dawley; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D000952:Antigens, Polyomavirus Transforming; D006649:Histocompatibility Antigens; D015395:Histocompatibility Antigens Class I; D014409:Tumor Necrosis Factor-alpha; C038353:histocompatibility antigens RT, rat; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma