title: A comparison of gene transfer and antigen-loaded dendritic cells for the generation of CD4+ and CD8+ cytomegalovirus-specific T cells in HLA-A2+ and HLA-A2- donors.
abstract: Dendritic cells have been used effectively to select for human cytomegalovirus (CMV)-specific T cells for immunotherapy applications. The ability to process and present relevant major histocompatibility complex class I and II peptides to T cells makes them ideal for selecting CD4+ and CD8+ T cells regardless of HLA tissue type. This study compared the generation of CMV-specific T cells by using dendritic cells loaded with either CMV pp65495-503 peptide or CMV lysate or transduced with adenovirus encoding the pp65 gene (Ad5pp65GFP) for the generation of CD4+ and CD8+ CMV-specific T cells in HLA-A2+ and HLA-A2 - donors. In HLA-A2+ donors, CD8+ tetramer+ T cells increased with all antigens but were greatest in peptide- and Ad5pp65GFP-stimulated T cells. The CD4+ /CD8+ ratio in the stimulated T-cell cultures proved to be dependent on the antigen used. CMV lysate-stimulated cells were primarily CD4+, whereas peptide- and Ad5pp65GFP-stimulated cultures were mostly CD8+. Analysis of cells from lysate-stimulated or gene-transduced-stimulated cultures showed expansion of CMV-specific CD4+ T cells, indicating that major histocompatibility complex class II peptides were present in both antigens. Furthermore, CMV-specific T cells were generated from HLA-A2 - donors by using Ad5pp65GFP transduction or CMV lysate stimulation and were able to recognize a pp65 peptide restricted to the HLA-B35 allele. These data indicate that either CMV lysate or adenovirus encoding CMV antigenic genes may be useful for the generation of both CD4+ and CD8+ CMV-specific T cells in donors irrespective of HLA tissue type and may be applicable to clinical immunotherapy.
authors.affiliation: Westmead Institute for Cancer Research, Westmead Millennium Institute, University of Sydney, Sydney, New South Wales, Australia.
authors.forename: Aaron E
authors.initials: AE
authors.lastname: Foster
authors.forename: Kenneth F
authors.initials: KF
authors.lastname: Bradstock
authors.forename: Uluhan
authors.initials: U
authors.lastname: Sili
authors.forename: Marina
authors.initials: M
authors.lastname: Marangolo
authors.forename: Cliona M
authors.initials: CM
authors.lastname: Rooney
authors.forename: David J
authors.initials: DJ
authors.lastname: Gottlieb
mesh_terms: D001782:Blood Donors; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D003587:Cytomegalovirus / Q000235:genetics / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology*; D015789:HLA-A2 Antigen / Q000276:immunology*; D006801:Humans; D010750:Phosphoproteins / Q000235:genetics / Q000276:immunology*; D014161:Transduction, Genetic; D014763:Viral Matrix Proteins / Q000235:genetics / Q000276:immunology*
chemical_list: D015789:HLA-A2 Antigen; D010750:Phosphoproteins; D014763:Viral Matrix Proteins; C464963:pp67 protein, human cytomegalovirus