Demonstration of Fcγ receptors on human basophil granulocytes

T. Ishizaka, A. R. Sterk, K. Ishizaka

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Fc(γ) receptors were detected on human basophil granulocytes. The mononuclear cell fraction of human peripheral blood was incubated with heat-aggregated human IgG (HGG) followed by 125I-anti-HGG. Autoradiography of the cells showed that the majority of basophil granulocytes gave a significant number of grains. Basophils were not labeled by preincubation of the same cells with monomeric HGG followed by 125I-anti-HGG. However, the binding of aggregated HGG to basophils was inhibited by the presence of a high concentration of monomeric HGG or its Fc fragment but not by the Fab fragment. Evidence was obtained that Fc(γ) receptors are distinct from IgE receptors on the same cells. Saturation of basophils with IgE did not affect the binding of aggregated HGG to the cells. Preincubation with and the presence of aggregated HGG failed to affect the binding of 125I-IgE to basophils, or to block passive sensitization of the cells with IgE antibodies. The Fc(γ) receptors did not co-cap with IgE receptors. Aggregated HGG failed to induce histamine release from basophils even in the presence of D2O. It was also found that the presence of aggregated HGG on basophils did not modulate IgE-mediated histamine release from the cells.

Original languageEnglish (US)
Pages (from-to)578-583
Number of pages6
JournalJournal of Immunology
Volume123
Issue number2
StatePublished - 1979
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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