title: Long-term human cytolytic T-cell lines allospecific for HLA-DR6 antigen are OKT4+.
abstract: Human allospecific cytotoxic T lymphocyte lines were established by weekly stimulation of peripheral blood lymphocytes with allogeneic Epstein-Barr virus-transformed lymphoblastoid cell lines in the presence of interleukin 2. The cytotoxic T lymphocyte lines were stimulated by either JY (which expresses HLA-A,B and -DR) or Daudi (which expresses HLA-DR but not -A,B antigens). Specificity of the effector cell lines was determined by antibody blocking and by patterns of cytolysis against a panel of target cell lines. The phenotype of the effector cells was identified by both negative (antibody and complement lysis) and positive (fluorescence-activated cell sorter) selection. The anti-JY lines only recognized targets bearing HLA-A2, B7 antigens and were composed exclusively of OKT4-8+ effector cells. The anti-Daudi lines, on the other hand, specifically recognized targets bearing DR6 and eventually contained only OKT4+8- cells. Thus, stimulation by Daudi cells can result in the generation of OKT4+ CTL lines that are allospecific for DR6 antigen.
mesh_terms: D000954:Antigens, Surface / Q000235:genetics*; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006650:Histocompatibility Testing; D006801:Humans; D010641:Phenotype; D012699:Serology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D000949:Histocompatibility Antigens Class II