title: Induction of human histo-blood group A antigen expression in mouse cells by gene therapy using lentiviral vectors harbouring human ABH-related glycosyltransferase genes.
abstract: We recently discovered that ABO incompatibility, which evokes a rapid humoral immune response in adult heart transplantation, is not a barrier in infant heart transplantation, and that infant recipients of ABO-incompatible hearts develop specific B-cell tolerance to donor A/B antigens. An animal model of ABO-incompatible heart transplantation would allow detailed investigation of the mechanism(s) of acceptance of ABO-incompatible grafts, using experimental methods that would not be possible in humans. To determine the feasibility of such a model, the human alpha-1,2-fucosyltransferase (H-transferase; for H antigen expression) gene was cloned into a lentiviral vector, and the human alpha-1,3-N-acetylgalactosaminyltransferase (A-transferase; for A antigen expression) gene was cloned into a bicistronic lentiviral vector also containing the green fluorescent protein (GFP) gene; these replication-deficient vectors were denoted H-trs and A-GFP, respectively. Synthesis of the human histo-blood group A antigen in humans is dependent on expression of these two glycosyltransferases. HeLa cells, a human cell line known to be of blood group O origin, expressed cell surface A antigen as measured by cellular ELISA when transfected with A-GFP alone, and the level of A antigen expression was enhanced by transfection with H-trs in addition to A-GFP. Cell surface H antigen expression was observed on both mouse fibroblast and mouse endothelial cells only when infected with H-trs lentiviral particles. Expression of A antigen was dependent on infection with both H-trs and A-GFP lentiviral particles, approaching levels on human group A cells. These collective results indicate that expression of human histo-blood group A antigen at the cell surface can be induced in mouse cells by infection with H-trs and A-GFP, and that such A antigen expression is dependent on H-trs expression.
authors.affiliation: Division of Cardiology, Department of Paediatrics, Hospital for Sick Children, University of Toronto, Canada.
authors.forename: X
authors.initials: X
authors.lastname: Fan
authors.forename: A
authors.initials: A
authors.lastname: Ang
authors.forename: K
authors.initials: K
authors.lastname: Tao
authors.forename: L J
authors.initials: LJ
authors.lastname: West
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000818:Animals; D004797:Enzyme-Linked Immunosorbent Assay; D005647:Fucosyltransferases / Q000235:genetics; D017930:Genes, Reporter; D015316:Genetic Therapy; D005822:Genetic Vectors; D016695:Glycosyltransferases / Q000235:genetics*; D006367:HeLa Cells; D006801:Humans; D016086:Lentivirus / Q000235:genetics*; D051379:Mice; D008822:Mice, Transgenic; D011401:Promoter Regions, Genetic; D014162:Transfection; D014183:Transplantation, Heterologous; D000097631:Galactoside 2-alpha-L-fucosyltransferase
chemical_list: D000017:ABO Blood-Group System; D005647:Fucosyltransferases; D016695:Glycosyltransferases; D000097631:Galactoside 2-alpha-L-fucosyltransferase