Identification of DR9-restricted XAGE antigen on lung adenocarcinoma recognized by autologous CD4 T-cells

Michihide Shimono, Akiko Uenaka, Yuji Noguchi, Shuichiro Sato, Hideo Okumura, Kazuhiko Nakagawa, Katsuyuki Kiura, Mitsune Tanimoto, Eiichi Nakayama

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15 Citations (Scopus)


We previously demonstrated a dominant IgG response against XAGE-1b antigen in a lung cancer patient by serological analysis of antigens by recombinant expression cloning (SEREX) analysis using a cDNA library from the autologous OU-LU-6 tumor cell line. In this study, we investigated recognition of XAGE-1b on OU-LU-6 tumor by the patient CD4-expressing tumor-infiltrating lymphocytes (CD4 TIL). The response of CD4 TIL obtained from malignant pleural effusion was determined against autologous OU-LU-6 tumor cells and XAGE-1b mRNA-transfected PHA-stimulated CD4 T-cells (T-APC) from healthy individuals sharing HLA-DR with the patient by performing IFNÁ secretion and ELISPOT assays. The patient CD4 TIL recognized OU-LU-6 in an HLA-DR-restricted manner and XAGE-1b mRNA-transfected T-APC derived from DRB1*0901-sharing healthy donor (HD)1 and HD2, but not DRB1*1101-sharing HD3 or HD4. Epitope analysis using 17 18-mer peptides with 12 overlapping amino acids revealed that the CD4 TIL recognized XAGE-1b 33-49. The findings suggest that the patient CD4 T-cells recognized the XAGE-1b 33-49-related epitope on autologous OU-LU-6 tumor cells in a manner restricted by DR*0901.

Original languageEnglish
Pages (from-to)835-840
Number of pages6
JournalInternational journal of oncology
Issue number4
Publication statusPublished - Apr 2007


  • CD4 T-cell response
  • Cancer/testis antigen
  • XAGE

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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