Volume 131, Issue 5 pp. E649-E658
Tumor Immunology

Spontaneous antibody, and CD4 and CD8 T-cell responses against XAGE-1b (GAGED2a) in non-small cell lung cancer patients

Yoshihiro Ohue

Yoshihiro Ohue

Department of Respiratory Medicine, Kawasaki Medical School, Kurashiki, Japan

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Shingo Eikawa

Shingo Eikawa

Department of Immunology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

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Nami Okazaki

Nami Okazaki

Department of Immunology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

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Yu Mizote

Yu Mizote

Department of Immunology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

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Midori Isobe

Midori Isobe

Department of Respiratory Medicine, Kawasaki Medical School, Kurashiki, Japan

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Akiko Uenaka

Akiko Uenaka

Department of Immunology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

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Minoru Fukuda

Minoru Fukuda

Department of Respiratory Medicine, Kawasaki Medical School, Kurashiki, Japan

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Lloyd J. Old

Lloyd J. Old

Ludwig Institute for Cancer Research, New York Branch at Memorial Sloan-Kettering Cancer Center, New York

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Mikio Oka

Mikio Oka

Department of Respiratory Medicine, Kawasaki Medical School, Kurashiki, Japan

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Eiichi Nakayama

Corresponding Author

Eiichi Nakayama

Faculty of Health and Welfare, Kawasaki University of Medical Welfare, Kurashiki, Japan

Tel.: +81-86-462-1111ext54954, Fax: +81-86-464-1109

Faculty of Health and Welfare, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama 701-0193, JapanSearch for more papers by this author
First published: 22 November 2011
Citations: 32

Abstract

The spontaneous immune responses against XAGE-1b (GAGED2a) were analyzed in non-small cell lung cancer (NSCLC) patients. An antibody response against XAGE-1b (GAGED2a) was observed in 10% (20/200) of NSCLC patients and in 19% (13/69) of stage IIIB/IV lung adenocarcinoma patients. A CD4 T-cell response was detected in 88% (14/16) and a CD8 T-cell response in 67% (6/9) in the XAGE-1b (GAGED2a) antibody-positive patients examined. Frequent antibody responses and CD4 and CD8 T-cell responses in XAGE-1b (GAGED2a) antibody-positive patients indicate the strong immunogenicity of the XAGE-1b (GAGED2a) antigen in NSCLC patients. We established T-cell clones from PBMCs of antibody-positive patients and determined the DRB1*04:05-restricted XAGE-1b (GAGED2a) 18–31 peptide (14-mer) as a CD4 T cell epitope and the A*02:06-restricted XAGE-1b (GAGED2a) 21-29 peptide (9-mer) as a CD8 T cell epitope. As for peptide recognition, CD4 and CD8 T-cell clones responded to naturally processed antigen. The CD4 T-cell clone recognized DCs pulsed with the synthetic protein or a lysate from XAGE-1b-transfected 293T cells. The CD8 T-cell clone showed cytotoxicity against a tumor expressing XAGE-1b (GAGED2a) and the appropriate HLA class I allele. These findings establish XAGE-1b (GAGED2a) as a promising target for a lung cancer vaccine.

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