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Differences in the number of the antigenic determinants of A1 and B erythrocytes were exploited to study the influence of the sensitization on antibody-dependent monocyte- and complement-mediated cytotoxicity. Lysis was compared in direct and cold target competition assays. The findings were: (1) Monocyte mediated lysis of both targets was similar; A1 erythrocytes, however, showed stronger competitive inhibition than B cells; (2) the competitive inhibition was influenced by the antiserum concentration in a range where the direct lysis was not; (3) in the presence of optimal concentrations of hyperimmune antisera and complement, A1 erythrocytes were lysed, while B erythrocytes were not; and (4) A1 cells exposed to suboptimal concentrations of complement consumed complement, while B cells did not. It was concluded that the cold target competition assay is more sensitive than the direct cytotoxicity test to detect differences in the sensitization of erythrocytes.
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