Abstract
Anti-tubular basement membrane antibodies (alpha TBMA) were tested in vitro in an antibody-dependent cellular cytotoxicity (ADCC) reaction utilizing tubular antigen-coated targets. A selected subpopulation of normal guinea pig spleen cells induced significantly more target cell lysis in the presence of sera containing alpha TBMA than in the presence of control sera. this ADCC reaction using alpha TBMA exhibited a characteristic dose responsiveness and the alpha TBMA binding was specific for species-independent tubular antigens. The spleen effector cells used in this assay were characterized as nonadherent, non-T cells bearing Fc-receptors similar to other previously described natural killer cells found in guinea pigs. These studies suggest that natural surveillance systems may be able to use alpha TBMA as an informational bridge to tubular antigens. Such a potential nephritogenic effector mechanism has not been previously described.
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