Monoclonal antibodies to HLA--DRw determinants

Tissue Antigens
F M BrodskyW F Bodmer

Abstract

Two monoclonal antibodies recognizing HLA-DRw (human la) antigens were produced. The DA2 antibody binds a monomorphic determinant, common to all specificities and Genox3.53 antibody binds to a cross-reacting site on the HLA-DRw1,2 and 6 specificities. Both antibodies are IgG1 and show complement dependent cytotoxicity only in the presence of rabbit anti-mouse IgG serum. Specificity of both antibodies for the HLA-DRw molecule was shown by inhibition of antibody binding by preincubation of antibody with detergent solubilized Ia from JY (HLA-DRw4,6) cells and by preincubation of target cells with F(ab')2 fragments of a rabbit anti-la serum. DA2 antibody reacted with all cells of human B cell origin tested and with peripheral blood lymphocytes of several primate species tested. Genox3.53 antibody bound only to human cells expressing HLA-DRw1,2 or 6 antigens, giving a negative reaction with all primates tested. Genox3.53 antibody detected a split in the HLA-DRw6 specificity, showing reduced binding to the Daudi cell (HLA-DRw6) in comparison with binding to several other cell lines typed as HLA-DRw6, under saturating conditions. This low reactivity with Daudi was confirmed by absorption experiments. The ratio of DA2 binding to Genox3...Continue Reading

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Citations

Jan 1, 1987·Immunogenetics·J D Fraser, J L Strominger
Jan 1, 1985·Immunogenetics·C NavarreteH Festenstein
Feb 1, 1983·European Journal of Immunology·R A NewmanH Festenstein
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