A novel molecule expressing HLA-DR antigenic determinants |
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| Authors: | S M Goyert J J Hubert R A Curry J Silver |
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| Institution: | 1. Department of Pathology, Irvington House Institute, New York University, USA;2. Section of Rheumatology, Department of Medicine, University of Minnesota, USA;3. Department of Cellular and Developmental Immunology, Scripps Clinic and Research Foundation, La Jolla, California, USA |
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| Abstract: | Our previous studies suggested that the polymorphism of HLA-DR antigens (the human equivalent of murine I-E antigens) was a result of structural variation in the small (beta) subunit. In order to more accurately define this polymorphism we have expanded these studies to include HLA-DR antigens isolated with monoclonal cells derived from genotypically HLA-homozygous DRw2, DR2w5, and DRw7 lymphoblastoid cells derived from offspring of consanguineous relationships. Our results indicate the large (alpha) subunits of DRw2 and DRw7 antigens are nearly identical, while their beta subunits show many differences. In contrast, both the alpha and beta subunits of the DRw5 antigen differ strikingly from the respective subunits of the DRw2 and DRw7 antigens. The significance of the variability of the DRw5 alpha subunit is in question at this point. One intriguing possibility is that DRw5 actually represents the human counterpart of the mouse I-A subregion antigen and that the monoclonal antibody is reacting with a determinant which is shared by the human equivalents of murine I-A and I-E antigens. |
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| Keywords: | MAb monoclonal antibody SDS sodium dodecyl sulfate IEF isoelectrofocusing PAGE polyacrylamide gel electrophoresis |
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