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. 1985 May;55(1):125–133.

Fc receptors on mouse neutrophils and eosinophils: antigenic characteristics, isotype specificity and relative cell membrane density measured by flow cytometry.

A F López, F L Battye, M A Vadas
PMCID: PMC1453574  PMID: 3158593

Abstract

The antigenic characteristics, isotype specificity and density of Fc receptors (FcR) on mouse neutrophils and eosinophils were studied with the aid of the rat monoclonal antibody 2.4 G2 to the mouse macrophage FcR (Unkeless, 1979). This MAb was tested for its reactivity with mouse neutrophil and eosinophil FcR, and for its ability to block the binding of sheep erythrocytes (E) coated with mouse antibodies of different isotypes to granulocytes. The use of E conjugated with fluorescein isothiocyanate (FITC) allowed an objective read-out by flow cytometry. The MAb 2.4.G2 reacted with both neutrophil and eosinophil FcR, blocking the binding of E coated with mouse IgG1, IgG2a and IgG2b in a dose-dependent manner. Blocking was specific, since it did not occur with any of several control MAb of the same rat isotype (IgG2b) as 2.4.G2. Furthermore, the binding to E through the granulocyte receptor for complement (C) was unaffected. IgG3 was unable to promote binding of E to either neutrophils or eosinophils, although it induced high levels of binding to macrophages. These results show that: (i) neutrophil, eosinophil and macrophage FcR have antigenic similarities; (ii) neutrophils and eosinophils, in contrast to macrophages, either have a common FcR for IgG1, IgG2a and IgG2b, or have different FcR for these isotypes which share the antigenic determinant recognized by 2.4.G2; (iii) in contrast to macrophages, neutrophils and eosinophils lack the FcR for IgG3. The MAb 2.4.G2 was used in an indirect immunofluorescence assay monitored by flow cytometry to measure the relative FcR density on neutrophils and eosinophils. This assay showed that neutrophils possess about 65% more FcR than eosinophils on a cell-for-cell basis, providing an explanation for the higher binding of neutrophils to IgG-coated particles at suboptimal antibody concentrations.

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Selected References

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