title: A DR7 specific monoclonal antibody TAL13.1, raised against a transfectant detects IL-4 upregulated antigen on peripheral B-lymphocytes.
abstract: A monoclonal antibody TAL13.1 was raised against mouse L cells transfected with the human HLA-DRB1*0701 gene. This antibody was found to be polymorphic recognizing a determinant expressed by the DR7, DRB1*0701 and DRB1*0702 gene products. Four polymorphic sites unique to this specificity have been identified within the DR beta 1 domain. These are residues 11-14, 25, 30 and 71-74, one or a combination of which is postulated as being responsible for conferring the specificity of the antibody. In Western blot analysis TAL13.1 was found to react with the DR alpha beta dimer, but not with the free alpha or beta chains. However, in flow cytometry it failed to bind a DR alpha/DQ beta mixed pair transfectant confirming that it recognizes an epitope on the DR beta not the DR alpha chain. Although TAL13.1, a low affinity antibody is negative or only weakly positive on resting peripheral blood lymphocytes (PBLs), we have demonstrated that by interleukin-4 (IL-4) stimulation we can up-regulate the levels of antigen already present and gain a level of binding comparable to that found on B lymphoid cell lines (B-LCLs) where it has been found to be a valuable reagent in their characterization.
authors.affiliation: Tissue Antigen Laboratory, Imperical Cancer Research Fund, London, U.K.
authors.forename: J M
authors.initials: JM
authors.lastname: Heyes
authors.forename: S G
authors.initials: SG
authors.lastname: Marsh
authors.forename: A M
authors.initials: AM
authors.lastname: Sadler
authors.forename: J A
authors.initials: JA
authors.lastname: Madrigal
authors.forename: J G
authors.initials: JG
authors.lastname: Bodmer
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D001402:B-Lymphocytes / Q000276:immunology*; D000939:Epitopes; D015809:HLA-DR7 Antigen / Q000276:immunology*; D006801:Humans; D066298:In Vitro Techniques; D015847:Interleukin-4 / Q000494:pharmacology; D051379:Mice; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D011994:Recombinant Proteins / Q000276:immunology; D016415:Sequence Alignment; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D015809:HLA-DR7 Antigen; D011994:Recombinant Proteins; D015847:Interleukin-4