title: Lyt phenotype of cytotoxic T cells: shift from Lyt-1+2+3+ to a mixed population of Lyt-1+2+3+ and Lyt-1-2+3+ during in vitro culture.
abstract: The Lyt phenotype of cytotoxic T cells generated in the primary H-2 response was investigated kinetically. The cytotoxicity generated in the early stage of culture was abolished by treatment with alpha Lyt-1,2,3, and complement (C), whereas that generated in the late stage was only partially eliminated by alpha Lyt-1, but was abolished by alpha Lyt-2, 3, and C. This suggested late expansion of the Lyt-1-2+3+ population. Lack of Lyt-1 antigen was confirmed with cells that were depleted of Lyt-1+ from primary culture and then stimulated in the secondary response by elimination of cytotoxicity and by direct Lyt typing. Results indicated that the response of proliferative and cytotoxic T cells of the Lyt-1+2+3+ phenotype in the early stage of culture was followed by activation of Lyt-1-2+3+ T cells. Cytotoxic T cells in the late stage were shown to be a mixture of Lyt-1+2+3+ and Lyt-1-2+3+ cells. This was confirmed with cytotoxic T cells from secondary culture and uncloned long-term T cell lines.
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000145:classification / Q000276:immunology*; D000961:Antilymphocyte Serum / Q000494:pharmacology; D002452:Cell Count; D002460:Cell Line; D003165:Complement System Proteins / Q000502:physiology; D003602:Cytotoxicity, Immunologic; D007519:Isoantigens / Q000276:immunology; D007700:Kinetics; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010641:Phenotype; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
chemical_list: D000950:Antigens, Ly; D000961:Antilymphocyte Serum; D007519:Isoantigens; D003165:Complement System Proteins