Interferon-gamma Treatment Impairs Fc Receptor Type II-mediated Phagocytosis of Human Macrophages by a Post-receptor-binding Mechanism

Overview

Journal Immunology

Specialty Allergy & Immunology

Date 1991 Nov 1

PMID 1837536

Authors

T W Jungi

M Brcic

C Leutwyler

H Pfister

M O Spycher

Affiliations

Soon will be listed here.

Abstract

The influence of priming by interferon-gamma (IFN-gamma) on FcR expression and function was investigated with human monocyte-derived macrophages. As a ligand specifically interacting with FcRII, bovine IgG1-coated erythrocytes (Bo1-EA) were used. The uptake of these particles by human monocytes and macrophages could be inhibited with anti-FcRII. Moreover, macrophages representing the phenotype that fails to interact with murine IgG1, as revealed in an anti-CD3 IgG1-driven T-cell proliferation assay, had a low avidity for Bo1-EA, and Bo1-EA-macrophage interaction could not be inhibited by anti-FcRII in these cells. Thus, anti-Leu-4 non-responsiveness in a T-cell stimulation assay is associated with an inability of FcRII to interact with bovine IgG1. An influence of IFN-gamma priming on FcRII expression and function was studied, therefore, in anti-Leu-4 responders (bovine IgG1 high responders in the phagocytosis test, susceptible to anti-FcRII treatment). IFN-gamma-primed macrophages from such donors displayed a markedly reduced phagocytosis of Bo1-EA. This reduction was observed both with adherent and with suspended macrophages This type of modulation was not due to a reduced expression of FcRII, nor due to a reduced avidity of expressed FcR to its ligand, as revealed by flow cytometric and rosetting analysis. Since phagocytosis of latex particles and of tanned erythrocytes is little influenced by IFN-gamma priming, our data suggest that IFN-gamma affects FcRII-mediated phagocytosis by a post-receptor-binding mechanism.

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