title: Detection of non-HLA-DR determinants by alloreactive lymphocyte clones.
abstract: Using the soft-agar colony assay, we have generated three MT3-associated clones: HJ1, HJ13, and HJ39, from an MLR combination of two unrelated individuals. Another clone, HJ37, appeared to recognize a novel HLA-D determinant. PLT inhibition studies with monoclonal anti-Ia-like antibodies (Mab) were conducted on clones HJ1, HJ39, and HJ37. Five different anti-DR Mab had no significant inhibitory effect on these clones. On the other hand, two Mab SG171 and Q5/13 which appear to react with DR and MT3 (I-A like) molecules strongly inhibited the two MT3-specific PLT clones. While SG171 and Q5/13 had little effect on HJ37, it was observed that a polymorphic Mab 17.15 had a strong inhibitory effect. These results, in concordance with biochemical data on Ia molecules precipitated by these Mab, suggest that these alloreactive clones may recognize non-DR PLT determinants. They also provide further indirect support that MT3 molecules represent the human homologue of murine I-A molecules.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D005802:Genes, MHC Class II; D006680:HLA Antigens / Q000032:analysis; D000949:Histocompatibility Antigens Class II / Q000032:analysis* / Q000276:immunology; D006801:Humans; D007158:Immunologic Techniques; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006680:HLA Antigens; D000949:Histocompatibility Antigens Class II