Abstract
The bovine IgG1 monoclonal antibody (mAb) ILA70 was made by immunizing a calf with peripheral blood mononuclear cells (PBM) from a BoLA-w10 homozygous heifer and subsequently fusing lymphocytes from the local lymph-node with the heterohybridoma 53B3. Family and population studies, antibody binding inhibition and immunoprecipitation of the target antigen all indicate that ILA70 detects a polymorphic epitope on a bovine class I major histocompatibility complex (MHC) molecule. The antibody is complement fixing and so may be used in a standard cytotoxicity assay. Ascitic fluid with antibody activity many times greater than that of the tissue-culture supernatant has been prepared in nude mice. The antibody-producing heterohybridoma has been subcloned three times and appears to be stable. Such heterohybridomas may prove to be a valuable source of particularly discriminating and informative mAbs for the serological analysis of the products of the bovine MHC.
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