In order to produce macaque monoclonal antibodies (mAbs) against human red blood cell (RBC) antigens, macaques were immunized with human and gorilla RBCs and their spleen lymphocytes were fused with man-mouse heteromyeloma cells. One macaque-mouse heterohybridoma produced a macaque IgG* (Cyn2-4D5) which agglutinated all human RBCs but not rare human variants Dc–, D– –, and Rhnull. Thus, Cyn2-4D5 exhibited RH17-like reactivity. The specificity of Cyn2-4D5 for RHCE-encoded polypeptides was confirmed by specific immunoprecipitation of RhcE and RhCe polypeptides from human RBCs and the absence of immunoprecipitation of the RhD polypeptides extracted from D– – RBCs. This study demonstrates that it is possible to produce macaque mAbs against human RBC blood group antigens.
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