title: Human allospecific T cell proliferative clones: different T cell clones expressing an apparently identical HLA class II specificity are heterogeneous in regard to their proliferative inhibition by a panel of monoclonal antibodies against human Ia-like antigens.
abstract: Four independent PLT clones displaying an apparently identical class II specificity (i.e., Dw/DR3) were found to give a heterogeneous pattern of inhibition in relation to 15 anti-class II mAb and an anti-beta 2m mAb used as a control. Some clones were inhibited by all anti-class II mAbs, irrespective of the cluster of molecular subsets with which they reacted. Such clones were also inhibited by the control anti-beta 2m mAb. Other clones were inhibited by only a few of the mAb tested. Within this group of T clones following the addition of a limiting amount of conditioned medium the inhibitory data of all independent clones with an identical specificity were inhibited by the same mAb; under these conditions, it was possible to relate the mAb inhibition patterns with the specificity of the T cell clones and these T cell specificities with the epitopic cluster/molecular subsets defined by these mAbs. A new level of T cell subset heterogeneity within T cell clones with apparent identical proliferative specificities is demonstrated, in relation to the T cell clone "susceptibility" or "resistance" to the effects of anti-class II mAbs directed towards their own Ia-like antigens.
mesh_terms: D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D002999:Clone Cells; D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D008213:Lymphocyte Activation; D008285:Major Histocompatibility Complex; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II