title: Clonal diversity of cytotoxic T lymphocytes that recognize autologous oral squamous cell carcinoma.
abstract: Cytotoxic T lymphocytes (CTLs) play an essential role in immunologic responses for tumor rejection. In the past decade, various melanoma tumor-associated antigens (TAAs) have been identified, and several clinical trials of vaccination immunotherapy and adoptive immunotherapy using such antigens with or without adjuvants have had fascinating results. However, this has not been the case with oral squamous cell carcinoma (OSCC) because of the difficulty of establishing oral cancer cell lines and CTLs against autologous oral cancer cells. Therefore, few oral cancer antigens have been identified with such CTLs. We herein present the successful establishment of an oral squamous cell carcinoma cell line, POT-1, and an HLA-A24-restricted CTL line (TcPOT-1) from a patient's autologous peripheral blood lymphocytes. TcPOT-1 recognized autologous POT-1 cells in an HLA-A24-restricted manner, and also allogeneic HLA-A24 (+) OSCC cell lines OSC-70 and HSC-2. We also succeeded in isolating two distinct CTL clones from TcPOT-1, HLA-A24-restricted CTL clone 4F11 and HLA-A33-restricted clone 4A11. Both of these clones recognized autologous POT-1 but not allogeneic OSSC cell lines. These data imply that the TcPOT-1 CTL line may include several CTL subpopulations with distinct antigen specificities, such as an HLA-A24-restricted POT-1-specific clone, HLA-A33-restricted POT-1-specific clone, and HLA-A24-restricted allogeneic OSCC-recognizing clone. Therefore, precise analysis of TcPOT-1-recognizing antigens may provide us with important information on as-yet-unknown tumor rejection antigens in OSCC.
authors.affiliation: Department of Pathology, Sapporo Medical University, School of Medicine, Sapporo, Japan.
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Kobayashi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Hirohashi
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Torigoe
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Michifuri
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Tamura
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Kamiguchi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Miyazaki
authors.forename: Akira
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Hariu
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Hiratsuka
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Sato
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000276:immunology*; D002294:Carcinoma, Squamous Cell / Q000276:immunology*; D045744:Cell Line, Tumor; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic / Q000276:immunology; D005260:Female; D015234:HLA-A Antigens / Q000276:immunology / Q000378:metabolism; D059871:HLA-A24 Antigen; D006801:Humans; D051379:Mice; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000276:immunology / Q000473:pathology*; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology* / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D015234:HLA-A Antigens; D059871:HLA-A24 Antigen