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The Journal of Immunology, Vol 133, Issue 2 556-561, Copyright © 1984 by American Association of Immunologists

ARTICLES

Quantitative analysis of Fc gamma receptors on murine spleen cell populations by using dual parameter flow cytometry

JA Titus, FD Finkelman, DA Stephany, JF Jones and DM Segal

The expression of Fc gamma R on subsets of mouse spleen cells was examined by dual parameter flow microfluorometry. B cells were detected by labeling them with antibodies against sIgM, sIgD, sIgG, or I-A; essentially all B cells expressed Fc gamma R. The number of Fc gamma R per cell on the sIgD+, sIgM+, and I-A+ cells averaged 2 X 10(4) receptors, and no correlation between the levels of expression of Fc gamma R and the B cell markers was evident. The sIgG+ B cells, however, expressed more Fc gamma R (8 X 10(4) receptors/cell) than sIgM+ and sIgD+ B cells. Fc gamma R on splenic macrophages were examined by double labeling spleen cells for Fc gamma R and Mac-1. The Mac-1+ cells (2 to 16% of the spleen cells) were 100% Fc gamma R+ and expressed threefold to fivefold higher numbers of Fc gamma R per cell than the sIgM+ or sIgD+ B cells. The Fc gamma R on T cells were studied on cells double labeled for Fc gamma R and Thy-1, Lyt-1, or Lyt-2. An average of 20% of the T cells expressed Fc gamma R and at least two subsets of Fc gamma R+ T cells were evident: Lyt-2- cells, most of which expressed intermediate (2 X 10(4) Fc gamma R/cell) levels of Fc gamma R, and Lyt- 2+ cells, which expressed mainly high (8 X 10(4) Fc gamma R/cell) amounts of Fc gamma R. The levels of expression of Fc gamma R and sIgM increased dramatically in response to infection and were elevated in mice with genetic defects. We conclude that the level of Fc gamma R expression is a characteristic property of subsets of spleen cells from normal and infected mice.


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