title: DR5-associated DC molecules carry three different allospecificities.
abstract: Antiserum 8w670 which had been classified as anti-DR5 in the Workshop analysis was found by the direct binding test to react with about 40% of Ia molecules in an Ia preparation from LG38 cells (DR5,5) that was deleted of DR molecules and DR-like molecules we call BR and enriched in DC molecules by pretreatment with a rabbit antiserum raised against alpha-subunits of DR and BR molecules. The specificity involved in the binding reaction was shown by the binding inhibition assay to be present in 100% of DR5-positive cases (53 out of 53) and 8w13-positive cases (2 out of 2) and in 23% of DR4-positive cases (4 out of 17). This association pattern did not correspond to any of the known supertypic specificities including the DC beta 4 and DC alpha 3, both of which had been found on DR5-associated DC molecules. Yet sequential binding analysis revealed that the 8w670-defined specificity was indeed present on the same molecules carrying DC beta 4 and DC alpha 3 specificities. This specificity was designated DC5.
mesh_terms: D000918:Antibody Specificity; D005190:Family; D005260:Female; D015805:HLA-DR5 Antigen; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007518:Isoantibodies / Q000235:genetics / Q000276:immunology*; D008297:Male; D010641:Phenotype; D011159:Population Surveillance; D011863:Radioimmunoassay
chemical_list: D015805:HLA-DR5 Antigen; D000949:Histocompatibility Antigens Class II; D007518:Isoantibodies