Abstract
We investigated the mechanism of T cell response to marine embryonal carcinoma F9 cells. Thy‐1+, CD4−, CD8− (double‐negative) cytotoxic effector cells were induced in spleen cells obtained from immune A.BY mice to F9 cells, and the cytotoxic activity was major histocompatibility complex (MHC)‐unrestricted. Furthermore, CD4+ T cells were essential for the induction of double‐negative cytotoxic T lymphocytes directed to F9 cells. Most of the double‐negative cytotoxic T lymphocyte lines obtained by long‐term culture of the effector cells had CD3 molecule and T‐cell receptor β chain on their cell surface, and the CDS molecule was found to be involved in target cell recognition. The T cell receptor αβ+ double‐negative cytotoxic T lymphocyte line (2A5) also lysed various tumor cells in a non‐MHC‐restricted manner, but did not lyse concanavalin A‐stimulated blasts of 129 strain, from which F9 cells had originated. These results indicate that T cell receptor αβ+ double‐negative cytotoxic T lymphocytes induced by F9 cells recognize a common antigen(s) expressed on F9 cells and other tumor cells but not minor histocompatibility antigens.
Keywords: Embryonal carcinoma F9 cell, Double‐negative cytotoxic T lymphocyte, CD4+ T cell
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