title: Failure to detect HLA-A*6802-restricted CD8+ T cells specific for Chlamydia trachomatis antigens in subjects from trachoma-endemic communities.
abstract: The role of HLA-A*6802-restricted CD8+ T cells in chlamydial disease was investigated in human ocular infections. Peptides with predicted binding motifs for HLA-A*6802 were synthesized using sequences based on chlamydial antigens, major outer membrane protein (MOMP), macrophage infectivity potentiator (MIP) and heat shock protein (hsp70). Peptides were pooled according to Chlamydia trachomatis protein type and serovar, and were tested in 51Cr-release cytotoxic T lymphocyte (CTL) and enzyme-linked immunospot (ELISPOT) assays, using peripheral blood mononuclear cells (PBMC) isolated from subjects living in trachoma-endemic communities in The Gambia. Significant CTL activity or interferon-gamma release was not detected in any of the subjects, suggesting either that HLA-A*6802 CD8+ T cells may not be important in ocular infections or that the peptides chosen did not represent epitopes.
authors.affiliation: Medical Research Council Laboratories, Fajara, Banjul, The Gambia, West Africa and London School of Hygiene and Tropical Medicine, London, UK.
authors.forename: O S
authors.initials: OS
authors.lastname: Mahdi
authors.forename: H C
authors.initials: HC
authors.lastname: Whittle
authors.forename: H
authors.initials: H
authors.lastname: Joof
authors.forename: D C
authors.initials: DC
authors.lastname: Mabey
authors.forename: R L
authors.initials: RL
authors.lastname: Bailey
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial / Q000032:analysis* / Q000276:immunology; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000382:microbiology; D016022:Case-Control Studies; D002478:Cells, Cultured; D002648:Child; D002690:Chlamydia Infections / Q000453:epidemiology / Q000276:immunology*; D002692:Chlamydia trachomatis / Q000276:immunology*; D003601:Cytotoxicity Tests, Immunologic; D004797:Enzyme-Linked Immunosorbent Assay; D018984:Epitopes, T-Lymphocyte / Q000032:analysis*; D005714:Gambia / Q000453:epidemiology; D015789:HLA-A2 Antigen / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D018840:HSP70 Heat-Shock Proteins / Q000276:immunology; D006801:Humans; D018655:Lymphocyte Count; D008875:Middle Aged; D010446:Peptide Fragments / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000382:microbiology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000382:microbiology
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D018984:Epitopes, T-Lymphocyte; D015789:HLA-A2 Antigen; D018840:HSP70 Heat-Shock Proteins; D010446:Peptide Fragments