title: Differential behavior of cytotoxic effector cells against HLA antigens in strong genetic linkage disequilibrium.
abstract: Five sets of cytotoxic effector cells were generated, using haplo-identical, first degree relatives in five different families, against the HLA-A3; B7 serological determinants combined with different DR antigens. When tested against a panel of cells bearing combinations of the HLA-A, -B and -DR antigens it was shown that the HLA-B7 antigen was as strong a CML target determinant alone as it was in the presence of HLA-A3. The strength of the HLA-A3 antigen as target determinant varied. With effector cells primed to the HLA-A3; B7; DR2 haplotype, the A3 antigen alone behaved as a weak target determinant. When the same target cells were tested with the effector cells generated against HLA-A3; B7 without DR2, the A3 antigen behaved as a strong target determinant. A number of target cells lacking the serologically detectable HLA determinants present on the sensitizing HLA haplotype were identified as being killed by specific effector cells. These data suggest either a number of new CML target determinants controlled by different loci or the presence of a single, new locus with multiple alleles controlling CML targets.
mesh_terms: D003602:Cytotoxicity, Immunologic; D000939:Epitopes; D005796:Genes; D006680:HLA Antigens / Q000235:genetics* / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006650:Histocompatibility Testing; D006801:Humans; D066298:In Vitro Techniques; D010641:Phenotype
chemical_list: D000939:Epitopes; D006680:HLA Antigens; D000949:Histocompatibility Antigens Class II