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There has been some controversy as to whether or not B cells can kill target cells through their Fc receptors. To address this, we have examined the ability of human B cells from a variety of sources to lyse hybridoma cells with specificity for either the B cell Fc gamma RII or Fc epsilon RII using a reverse killing assay, as well as their ability to lyse opsonized chicken erythrocytes using a classic ADCC assay. Tonsil B cells, chronic lymphocytic leukemia B cells, and Epstein-Barr virus-induced B cells, even after preactivation with a cocktail of cytokines, all failed to lyse any of these targets. We conclude that Fc gamma RII and Fc epsilon RII on human B cells are not cytotoxic trigger molecules.
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