title: Expansion of tumor-specific cytolytic T lymphocytes using in vitro restimulation with tumor-specific transplantation antigen.
abstract: Tumor-specific T lymphocytes (CTL) induced by in vivo immunization of C3H/HeJ mice with the syngeneic methylcholanthrene (MCA)-induced fibrosarcoma MCA-F were expanded in vitro by restimulation with 1-butanol-extracted, isoelectrophoretically purified, tumor-specific transplantation antigen (TSTA) in combination with purified rat interleukin-2 (IL-2) and fresh, syngeneic, 2000-R-irradiated, adherent splenic antigen-presenting cells (APC). The cultured immune T-cell population, containing 40-55% Lyt 2+ and 40-60% L3T4+ cells, displayed TSTA-specific proliferative and cytotoxic activities in vitro. The expanded T cells appear to recognize butanol-extracted TSTA in association with specific H-2 class I antigens, as revealed by the benefit of syngeneic over allogeneic cells as APC and by the adverse effect of depletion using anti-H-2K, but not anti-Ia, monoclonal antibodies. In adoptive transfer assays in vitro, expanded T cells specifically neutralize homotypic, but not heterotypic, tumor growth in vivo. Based upon the effects of depletion of T-lymphocyte subpopulations using monoclonal antibodies, the Lyt 2+ cytotoxic T lymphocytes (CTL) appear to display greater in vivo neutralizing activity than L3T4+ T cells. Thus in vitro stimulation of in vivo-immunized T cells, using butanol-extracted TSTA in combination with IL-2 and syngeneic APC, expands tumor-specific CTL.
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm / Q000276:immunology*; D000954:Antigens, Surface / Q000032:analysis; D000440:Butanols; D003602:Cytotoxicity, Immunologic; D005354:Fibrosarcoma / Q000276:immunology; D006183:H-2 Antigens / Q000276:immunology*; D007156:Immunologic Memory; D007376:Interleukin-2 / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D012513:Sarcoma, Experimental / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D013997:Time Factors
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D000440:Butanols; D006183:H-2 Antigens; D007376:Interleukin-2