title: HLA-DRB1*0410-restricted recognition of XAGE-1b37-48 peptide by CD4 T cells.
abstract: XAGE-1b belongs to cancer/testis (CT) antigens, and has been shown to be expressed frequently in lung cancers and to elicit an antibody response in patients with XAGE-1b-expressing tumors. In this study, we investigated an XAGE-1b peptide recognized by CD4 T cells. CD4 T cells were purified from PBMC of a healthy donor and stimulated with pooled 25-mer peptides overlapped with 15 amino acids spanning the entire XAGE-1b protein. The generation of XAGE-1b-specific CD4 T cells was shown by IFNgamma secretion assay. A CD4 T cell clone OHD1 was obtained by limiting dilution. OHD1 recognized two overlapping peptides, XAGE1-b(33-49) and XAGE-1b(37-52), by ELISPOT assay. A peptide XAGE-1b(38-46) which was included in both XAGE-1b(33-49) and XAGE-1b(37-52) was predicted to be a DRB1*0410-restricted 9-mer peptide by a computer-based program. We identified the 12-mer peptide XAGE-1b(37-48) as a new XAGE-1b epitope restricted to HLA-DRB1*0410.
authors: Department of Immunology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Okayama 700-8558, Japan. ymori@jichi.ac.jp
authors: Yoshiyuki
authors: Y
authors: Morishita
authors: Akiko
authors: A
authors: Uenaka
authors: Savas
authors: S
authors: Kaya
authors: Shuichiro
authors: S
authors: Sato
authors: Toshiki
authors: T
authors: Aji
authors: Eiichi
authors: E
authors: Nakayama
mesh_terms: D000595:Amino Acid Sequence; D000951:Antigens, Neoplasm / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D006684:HLA-DR Antigens / Q000276:immunology*; D059811:HLA-DRB1 Chains; D006801:Humans; D007167:Immunotherapy / Q000379:methods; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm; D018984:Epitopes, T-Lymphocyte; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; D010446:Peptide Fragments; C413656:XAGE1A protein, human