title: T-cell receptor Vbeta gene usage by T cells reactive with the tumor-rejection antigen SART-1 in oral squamous cell carcinoma.
abstract: We recently described that the SART-1(690-698) peptide could induce HLA-A24-restricted cytotoxic T lymphocytes (CTLs), which recognize the SART-1(259) (+) tumor cells from peripheral blood mononuclear cells (PBMCs) of HLA-A24(+) cancer patients. In our study, in 5 of 14 HLA-A24(+) patients with oral squamous cell carcinomas (SCCs), CTLs could be induced with the SART-1(690-698) peptide from the PBMCs. In 2 of the patients from whom the highest CTL activities were induced, the T-cell receptor (TCR) Vbeta repertoire expressed by the SART-1(690-698)-specific CTLs was found to be restricted and multiple Vbeta families were predominantly expressed in each patient. Although the predominant Vbeta families were different between the 2 patients, Vbeta7 was highly and commonly predominant. The same predominant Vbeta families were also detected in the tumor-infiltrating lymphocytes (TILs) from each patient, and each Vbeta family contained one or more unique T-cell clonotypes. The unique T-cell clonotypes were found to be common between the TILs and SART-1(690-698)-specific CTLs from each patient, and especially 2 T-cell clonotypes with Vbeta7 were identical even in the 2 patients. One of the 2 T-cell clonotypes with Vbeta7 was detected in the TILs from 11 of 14 HLA-A24(+) patients and another was found in those from 8 of HLA-A24(+) patients, while none of 10 HLA-A24(-) patients demonstrated both T-cell clonotypes. These results strongly suggest that the T-cell clonotypes with Vbeta7 are major TCR Vbeta genes expressed by SART-1(690-698)-specific CTLs. Furthermore, autologous tumor cells from one of the HLA-A24(+) patients stimulated the PBMCs and regional lymph node cells (LNCs) to expand the same T-cell clonotypes as those in the SART-1(690-698)-specific CTLs. These results strongly suggest that the SART-1(690-698)-specific CTLs clearly accumulate in vivo, especially in the TILs, as a consequence of in situ antigenic stimulation by autologous tumor cells. The identification of the unique TCR Vbeta genes used by SART-1(259)-specific CTLs should help to improve the diagnosis of the specific immune response in patients with SART-1(259) (+) cancers, especially during anticancer immunotherapy.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Dental Science, Kyushu University, Fukuoka, Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Kumamaru
authors.forename: Seiji
authors.initials: S
authors.lastname: Nakamura
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kadena
authors.forename: Akira
authors.initials: A
authors.lastname: Yamada
authors.forename: Eiji
authors.initials: E
authors.lastname: Kawamura
authors.forename: Masanori
authors.initials: M
authors.lastname: Sasaki
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Ohyama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Toyoshima
authors.forename: Jun-Nosuke
authors.initials: JN
authors.lastname: Hayashida
authors.forename: Kyogo
authors.initials: K
authors.lastname: Itoh
authors.forename: Kanemitsu
authors.initials: K
authors.lastname: Shirasuna
mesh_terms: D000951:Antigens, Neoplasm / Q000378:metabolism* / Q000494:pharmacology; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D019674:Genes, T-Cell Receptor beta; D015234:HLA-A Antigens / Q000378:metabolism; D059871:HLA-A24 Antigen; D006801:Humans; D008213:Lymphocyte Activation; D009062:Mouth Neoplasms / Q000378:metabolism*; D009363:Neoplasm Proteins / Q000378:metabolism* / Q000494:pharmacology; D017411:Ribonucleoproteins, Small Nuclear; D013602:T-Lymphocytes, Cytotoxic / Q000378:metabolism*; D014407:Tumor Cells, Cultured
chemical_list: D000951:Antigens, Neoplasm; D015234:HLA-A Antigens; D059871:HLA-A24 Antigen; D009363:Neoplasm Proteins; D017411:Ribonucleoproteins, Small Nuclear; C431323:SART1 protein, human