title: CD8+ T cell-mediated HLA-A*0201-restricted cytotoxicity to transaldolase peptide 168-176 in patients with multiple sclerosis.
abstract: Transaldolase (TAL) is expressed at selectively high levels in oligodendrocytes and targeted by autoreactive T cells of patients with multiple sclerosis (MS). Among 14 TAL peptides with predicted HLA-A2 binding, TAL 168-176 (LLFSFAQAV, TALpep) exhibited high affinity for HLA-A2. Prevalence of HLA-A2-restricted CD8+ T cells specific for TALpep was increased in PBMC of HLA-A2+ MS patients, as compared with HLA-A2- MS patients, HLA-A2+ other neurological disease patients, and HLA-A2+ healthy donors. HLA-A*0201/TALpep tetramers detected increased frequency of TAL-specific CD8+ T cells, and precursor frequency of TAL-specific IFN-gamma-producing T cells was increased in each of seven HLA-A2+ MS patients tested. Stimulation by TALpep or rTAL of PBMC from HLA-A2+ MS patients elicited killing of TALpep-pulsed HLA-A2-transfected HmyA2.1 lymphoma cells, but not HLA-A3-transfected control HmyA3.1 targets. Without peptide pulsing of targets, HLA-A2-transfected, but not control MO3.13 oligodendroglial cells, expressing high levels of endogenous TAL, were also killed by CD8+ CTL of MS patients, indicating recognition of endogenously processed TAL. TCR Vbeta repertoire analysis revealed use of the TCR Vbeta14 gene by T cell lines (TCL) of MS patients generated via stimulation by TAL- or TALpep-pulsed APCs. All TAL-specific TCL-binding HLA-A*0201/TALpep tetramers expressed TCR Vbeta14 on the cell surface. Moreover, Ab to TCR Vbeta14 abrogated cytotoxicity by HLA-A2-restricted TAL-specific TCL. Therefore, TAL-specific CTL may serve as a novel target for therapeutic intervention in patients with MS.
authors.affiliation: Department of Medicine, State University of New York College of Medicine, Syracuse, NY 13210, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Niland
authors.forename: Katalin
authors.initials: K
authors.lastname: Banki
authors.forename: William E
authors.initials: WE
authors.lastname: Biddison
authors.forename: Andras
authors.initials: A
authors.lastname: Perl
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000595:Amino Acid Sequence; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D016022:Case-Control Studies; D003602:Cytotoxicity, Immunologic; D005260:Female; D015234:HLA-A Antigens / Q000276:immunology*; D015789:HLA-A2 Antigen; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000276:immunology* / Q000473:pathology; D009836:Oligodendroglia / Q000201:enzymology; D010446:Peptide Fragments / Q000276:immunology; D037182:T-Cell Antigen Receptor Specificity; D014153:Transaldolase / Q000276:immunology*
chemical_list: D015234:HLA-A Antigens; C435939:HLA-A*02:01 antigen; D015789:HLA-A2 Antigen; D010446:Peptide Fragments; D014153:Transaldolase