Abstract:
:Six murine monoclonal antibodies raised against sheep MHC class II molecules were analyzed for reactivity with HLA-D subregion products. All the antibodies reacted with human peripheral blood lymphocytes, monocytes, and B-lymphoblastoid cell lines homozygous for various HLA-DR specificities, suggesting that the antibodies recognized nonpolymorphic determinants on HLA class II molecules. SDS-PAGE and two-dimensional NEPHGE/SDS-PAGE analyses of molecules immunoprecipitated from 35S-methionine-labeled, DR-homozygous B-lymphoblastoid cell lines showed that the monoclonal antibodies precipitated typical class II molecules (Mr 32-34K and 25-29K). From comparison with antibodies of known HLA-D subregion specificity, two of the sheep antibodies appeared to react with the products of single HLA-D subregions, while another showed balanced reactivity with all HLA-D molecules. Antibody SBU.II 38-27 reacted exclusively with HLA-DQ molecules, antibody SBU.II 28-1 with HLA-DP molecules, and antibody SBU.II 49-1 with HLA-DR, -DQ, and -DP molecules. However, analysis of immunoprecipitates from surface-iodinated WT-49 cells (DR3 homozygous) using SBU.II 28-1 and the DP-specific monoclonal antibody B7/21, suggested that the two antibodies immunoprecipitated different alpha polypeptides. The two antibodies SBU.II 38-27 and 28-1 appear to be at least as specific as existing reagents, if not more so. As such, they are of value in their potential contribution to our understanding of the molecular characteristics and ultimately the functions of the HLA-DQ and -DP subregion products, as well as the identification/characterization of HLA-D equivalents in other species.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Puri NK,de Kretser T,Brandon MRdoi
10.1016/0198-8859(87)90103-0subject
Has Abstractpub_date
1987-11-01 00:00:00pages
195-207issue
3eissn
0198-8859issn
1879-1166pii
0198-8859(87)90103-0journal_volume
20pub_type
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