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Functional characterization of mouse T lymphocytes with IgM-Fc receptors. I. Studies on ADCC and helper cell function.

The function of mouse T lymphocytes with receptors for IgM-Fc was analyzed by using immunofluorescence and a column separation method. The cellular uptake of FITC-IgM was inhibited with unlabeled Fc5 mu. IgM-FcR+ cells were active in ADCC against IgM-sensitized target cells, but not against IgG-coated target cells. The cells mediating ADCC with IgM antibody were shown to be distinct and physically separable from those mediating ADCC with IgG antibody. Helper T lymphocytes for humoral antibody formation in a hapten-carrier system were shown to be IgM-FcR+ and Fc-IgG-.