Fc Receptors for IgG(1) and IgG(3) on Human Mononuclear Cells - An Evaluation with Known Levels of Erythrocyte-Bound IgG

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Abstract
The Fc receptors on mononuclear cells were investigated by a rosette technique in which human erythrocytes were sensitized with a known number of molecules of anti-Rh antibodies (IgG(1) or IgG(3)). The number of IgG molecules was quantitated by a radiometric antiglobulin test. The present quantitative evaluation reveals that (1) there is a logarithmic relationship between the proportion of rosettes and the amount of erythrocyte-bound immunoglobulin for both types of mononuclear cells, and for both subclasses; (2) similar percentage of rosettes can be obtained with fewer IgG(3) than IgGi molecules (about 1:4); (3) for a given number of erythrocyte-bound immunoglobulins a higher percentage of rosettes is observed with monocytes than with lymphocytes (ratios of about 3:1 for IgG(1) and 5:1 for IgG(3)); (4) the minimum number of IgG(3) molecules for adherence is 180-460 for monocytes, 520-1,300 for lymphocytes, whilst for IgG(1) the numbers are 1,180-4,300 for monocytes and 3,400-14,200 for lymphocytes; (5) the minimum levels of sensitization by alloantibodies for adherence should be detectable by the antiglobulin test.

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