PMID: 12960360Sep 10, 2003Paper

Fc gamma RIIa is expressed on natural IFN-alpha-producing cells (plasmacytoid dendritic cells) and is required for the IFN-alpha production induced by apoptotic cells combined with lupus IgG

The Journal of Immunology : Official Journal of the American Association of Immunologists
Ullvi BåveLars Rönnblom

Abstract

An ongoing production of IFN-alpha may be of etiopathogenic significance in systemic lupus erythematosus (SLE). It may be due to the natural IFN-producing cells (NIPC), also termed plasmacytoid dendritic cells (PDC), activated by immune complexes that contain nucleic acids derived from apoptotic cells. We here examined the role of FcgammaR in the IFN-alpha production in vitro by PBMC induced by the combination of apoptotic U937 cells and autoantibody-containing IgG from SLE patients (SLE-IgG). The Fc portion of the SLE-IgG was essential to induce IFN-alpha production, because Fab fragments or F(ab')(2) were ineffective. Normal, especially heat-aggregated, IgG inhibited the IFN-alpha production, suggesting a role for FcgammaR on PBMC. Using blocking anti-FcgammaR Abs, the FcgammaRIIa,c (CD32) but not FcgammaRI or FcgammaRIII were shown to be involved in the IFN-alpha induction by apoptotic cells combined with SLE-IgG, but not by HSV or CpG DNA. In contrast, the action of all of these inducers was inhibited by the anti-FcgammaRIIa,b,c mAb AT10 or heat-aggregated IgG. Flow cytometric analysis revealed that approximately 50% of the BDCA-2-positive PBMC, i.e., NIPC/PDC, expressed low but significant levels of FcgammaRII, as did most...Continue Reading

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