title: Detection of at least two distinct mouse I-E antigen molecules by the use of a monoclonal antibody.
abstract: In an attempt to determine whether the expression of more than a single Ia antigen is determined by the I-E subregion of the mouse major histocompatibility complex (MHC), sequential immunoprecipitation analyses were performed by using a monoclonal antibody and alloantisera reactive with I-E subregion products. 3H-leucine-labeled glycoprotein preparations obtained from H-2d spleen cells were precleared with the monoclonal antibody 14-4-4S and then examined for residual Ia activity precipitable by an alloantiserum detected by SDS-polyacrylamide gel electrophoresis. Residual Ia activity was observed for all three strains of the H-2d haplotype tested. The residual Ia activity could be detected by sera absorbed with B10.A spleen cells, indicating that products of the I-E subregion rather than of the I-C subregion were responsible for this activity. No separable I-Ek molecules were detected in products of B10.A cells with the use of combinations of two monoclonal antibodies (including 14-4-4S) and several appropriate alloantisera. These findings indicate the presence of at least two similar but distinct I-E antigens encoded by the H-2d haplotype.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000235:genetics / Q000276:immunology*; D011232:Chemical Precipitation; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology; D006238:Haploidy; D006649:Histocompatibility Antigens / Q000235:genetics / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007106:Immune Sera / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008970:Molecular Weight
chemical_list: D000911:Antibodies, Monoclonal; D006183:H-2 Antigens; D006649:Histocompatibility Antigens; D000949:Histocompatibility Antigens Class II; C024138:I-E-antigen; D007106:Immune Sera