title: Specific lysis of murine cells expressing HLA molecules by allospecific human and murine H-2-restricted anti-HLA T killer lymphocytes.
abstract: The lysis by human and murine anti-HLA cytolytic T lymphocytes (CTL) of murine cells expressing class I HLA molecule after gene transfection has been studied using two different murine cells: LMTK- and P815-HTR-TK-. Weak but significant HLA-A11-specific lysis was found occasionally with human CTL on the HLA-A11+ L cells. On the contrary, P815-A11 or P815-A2 cells were lysed strongly and specifically by HLA-A11 or HLA-A2-specific human CTL. The T8+T4- phenotype of the effector cells was confirmed and the reaction was inhibited by anti-HLA class I monoclonal antibodies. Despite their higher sensitivity to human CTL, the P815-HLA+ cells did not express higher levels of HLA antigens than L cells, and the presence or the absence of human beta 2 microglobulin was irrelevant. Anti-human LFA-1 antibodies abrogated the lysis of P815-A11+ cells showing that the LFA-1 receptor which is apparently lacking on the L cell surface was on the contrary expressed on P815 cells. On the other hand, murine anti-HLA CTL have been prepared by immunizing mice against syngeneic HLA-A11+ L cells. They lysed very efficiently and specifically these cells, but appeared completely devoid of activity against human HLA-A11 target cells. This barrier was apparently due to the H-2 restriction of these H-2k anti-HLA murine CTL, as shown by their inability to lyse allogeneic H-2d cells expressing HLA-A11, and by the blocking of their activity by anti H-2k antibodies. By contrast, xenogeneic anti-HLA CTL obtained by immunizing murine lymphocytes against human cells lysed both human and murine HLA+ cells but they reacted with a monomorphic epitope of the HLA molecule in a nonrestricted way. These results show that human cells lyse very efficiently P815 murine cells expressing HLA class I antigens; the higher sensitivity of P815 cells compared to L cells is probably due to the presence of a LFA-1 receptor on these cells; a class I molecule of human origin can be seen as an H-2-restricted minor histocompatibility antigen in another species.
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000276:immunology; D001667:Binding, Competitive; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D004306:Dose-Response Relationship, Immunologic; D006183:H-2 Antigens / Q000276:immunology*; D006680:HLA Antigens / Q000032:analysis / Q000276:immunology*; D015234:HLA-A Antigens; D059870:HLA-A11 Antigen; D006801:Humans; D007739:L Cells / Q000276:immunology; D016169:Lymphocyte Function-Associated Antigen-1; D051379:Mice; D008809:Mice, Inbred C3H; D008811:Mice, Inbred DBA; D013045:Species Specificity; D013602:T-Lymphocytes, Cytotoxic / Q000145:classification / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D006183:H-2 Antigens; D006680:HLA Antigens; D015234:HLA-A Antigens; D059870:HLA-A11 Antigen; D016169:Lymphocyte Function-Associated Antigen-1