Selective lysis of the autologous tumor by delta TCS1+ gamma/delta+ tumor-infiltrating lymphocytes from human lung carcinomas

• Published in: European journal of immunology Vol. 20; no. 12; p. 2685
• Main Authors: Zocchi, M R, Ferrarini, M, Rugarli, C
• Format: Journal Article
• Language: English
• Published: Germany 01.12.1990
• Subjects: Antibodies, Monoclonal; Antigens, CD - analysis; Antigens, CD1; Antigens, Differentiation - immunology; Carcinoma - immunology; Cell Line; Cytotoxicity, Immunologic; Histocompatibility Antigens Class I - immunology; Humans; Immunity, Cellular; In Vitro Techniques; Lung Neoplasms - immunology; Lymphocytes, Tumor-Infiltrating - immunology; Precipitin Tests; Receptors, Antigen, T-Cell - classification; Receptors, Antigen, T-Cell - immunology; T-Lymphocyte Subsets - immunology
• ISSN: 0014-2980
• DOI: 10.1002/eji.1830201224

Two distinct non-overlapping populations of TcR1+ (gamma/delta) T cells have been described: the first, bearing the disulfide-linked gamma/delta heterodimer, is predominant in the peripheral blood; the second, expressing the non-disulfide-linked form of TcR1, is mostly confined to epithelial tissues (lung, gut, skin). TcR1+ lymphocytes may be cytotoxic and could be involved in anti-tumor immunity, especially against tumors at epithelial sites. Freshly derived tumor-infiltrating lymphocytes (TIL) obtained from two patients with lung cancer were enriched in CD3+WT31- cells. The percentage of this subset substantially increased upon culture in the presence of interleukin 2. These cells were TcR1+ as demonstrated by immunofluorescence and immunoprecipitation. In one case only 40% of this population reacted with delta TCS1 mAb, that recognizes the non-disulfide-linked form of TcR1, and co-expressed the CD8 antigen. Cultured TcR1+ TIL were able to kill fresh autologous tumor cells, K-562 and, to a lesser extent, some natural killer-resistant cell lines and allogeneic lung tumor cells in 4-h 51Cr-release cytotoxicity assays. The fractionated delta TCS1+ TIL lysed only autologous tumor cells and K-562, whereas the lytic activity against all the other targets was confined to the delta TCS1- subset. Moreover, the autotumor cytotoxicity was inhibited by anti-HLA class I but not by anti-CD1c or anti-LFA-1 mAb, suggesting that killing of the autologous tumor cells and non-major histocompatibility complex-restricted cytotoxicity are mediated by different mechanisms.