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. 1990 Aug;86(2):416–423. doi: 10.1172/JCI114727

Soluble Fc gamma receptor III in human plasma originates from release by neutrophils.

T W Huizinga 1, M de Haas 1, M Kleijer 1, J H Nuijens 1, D Roos 1, A E von dem Borne 1
PMCID: PMC296743  PMID: 2166753

Abstract

FcRIII (the CD16-antigen), a low affinity receptor for IgG, is expressed by neutrophils, natural killer lymphocytes, and macrophages. We have developed a sensitive radioimmunoassay to quantify FcRIII. A soluble form of FcRIII was identified in human plasma. Immunoprecipitation of FcRIII from plasma showed that the plasma form of FcRIII has an identical electrophoretic mobility as the FcRIII expressed by neutrophils. Moreover, the plasma form of FcRIII exhibited the same polymorphism as does the neutrophil FcRIII. The neutrophil expresses the phosphatidylinositol-linked form of FcRIII, encoded by the gene FcRIII-1. Because it is not known whether this gene is also active in nonhematopoietic cells, we analyzed patients with an acquired clonal disorder of their hematopoietic cells, paroxysmal nocturnal hemoglobinuria (PNH). PNH patients appeared to have a strongly reduced expression of FcRIII on their neutrophils. The concentration of FcRIII in the plasma of these patients was also reduced, indicating that plasma FcRIII originates from neutrophils. A patient deficient in FcRIII-1 but with a normal expression of FcRIII-2 had no soluble FcRIII in her plasma, also indicating that plasma FcRIII originates from neutrophils. The electrophoretic mobility of the protein backbone of plasma FcRIII and FcRIII released by activated neutrophils was identical, whereas deglycosylated FcRIII obtained from a lysate of neutrophils migrated slower. This indicates that plasma FcRIII originates from activation-induced release by neutrophils. Stimulation of neutrophils or neutrophil cytoplasts (closed membrane vesicles filled with cytoplasm) with low concentrations of FMLP (10(-9)-10(-8) M) or phorbol myristate acetate (1-10 ng/ml) induced a dose-dependent release of FcRIII. The plasma concentration of FcRIII was relatively constant (range 40-280% of the mean). Soluble FcRIII was also detected in inflamed joint fluids of arthritis patients, suggesting that FcRIII is also released by activated neutrophils in vivo.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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