title: Cationic liposome-mediated enhanced generation of human HLA-restricted RSV-specific CD8+ CTL+.
abstract: Generation of human CD8+ cytotoxic T-lymphocyte (CTL) activity against respiratory syncytial virus (RSV) using peripheral blood leukocytes (PBL) in vitro is inefficient. Lipofectamine, a polycationic liposome, previously shown to enhance the transfection efficiency of DNA in cells, was evaluated for enhancing RSV CTL activity. Stimulator cells were prepared by infecting human PBL with RSV with or without Lipofectamine for 3 hr and then transferred to responder cells. After 8 days of incubation, CTL lysis of autologous target cells infected with RSV (also treated with Lipofectamine) was determined in a 4-hr 5'chromium release assay. Lipofectamine treatment significantly enhanced HLA-restricted RSV-specific CD8+ CTL activity (up to sevenfold, P < 0.05-0.001). Lipofectamine treatment also enhanced cell surface RSV antigen expression and increased the frequencies of HLA-A,B,C+/RSV+ and HLA-DR+/RSV+ leukocytes as demonstrated by flow cytometry. These results demonstrate the usefulness of cationic liposomes in augmenting cell surface antigen expression and increasing the efficiency of generation of human RSV-specific CD8+ CTL activity.
authors.affiliation: Influenza Research Center, Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas 77030, USA. Mbawuike@bcm.tmc.edu
authors.forename: Innocent N
authors.initials: IN
authors.lastname: Mbawuike
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Ling
authors.initials: L
authors.lastname: Song
mesh_terms: D000328:Adult; D001773:Blood Cells / Q000276:immunology / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006680:HLA Antigens / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular / Q000187:drug effects; D008055:Lipids / Q000494:pharmacology; D008081:Liposomes / Q000494:pharmacology*; D008297:Male; D018113:Respiratory Syncytial Virus, Human / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects* / Q000276:immunology
chemical_list: D006680:HLA Antigens; D008055:Lipids; C086724:Lipofectamine; D008081:Liposomes