IgA Complexes Induce Neutrophil Extracellular Trap Formation More Potently Than IgG Complexes

被引:26
作者
Gimpel, Anna-Katharina [1 ,2 ,3 ]
Maccataio, Antonio [1 ,2 ,3 ]
Unterweger, Harald [2 ,4 ]
Sokolova, Maria V. [1 ,2 ,3 ]
Schett, Georg [1 ,2 ,3 ]
Steffen, Ulrike [1 ,2 ,3 ]
机构
[1] Friedrich Alexander Univ Erlangen Nurnberg, Dept Internal Med 3, Erlangen, Germany
[2] Univ Klinikum Erlangen, Erlangen, Germany
[3] Friedrich Alexander Univ Erlangen Nurnberg, Deutsch Zentrum Immuntherapie, Erlangen, Germany
[4] Friedrich Alexander Univ Erlangen Nurnberg, Dept Head & Neck Surg, Sect Expt Oncol & Nanomed SEON, Else KronerFresenius Stiftung Professorship, Erlangen, Germany
基金
欧盟地平线“2020”; 欧洲研究理事会;
关键词
IgA; IgG; immune complex; NET; neutrophil; FC; RECEPTOR; LEADS;
D O I
10.3389/fimmu.2021.761816
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Neutrophil extracellular trap (NET) formation is a powerful instrument to fight pathogens, but may induce collateral damage in the affected tissues. Besides pathogen-derived factors, immune complexes are potent inducers of NET formation. Neutrophils express IgA and IgG specific Fc receptors (FcRs) and therefore respond to complexed IgA and IgG. Especially in the context of autoimmune diseases, IgA and IgG immune complexes have been shown to trigger NET formation, a process that putatively contributes to disease severity. However, it is of question if both antibody classes stimulate neutrophils to the same extent. In this study, we compared the capability of IgA and IgG complexes formed by heat aggregation to induce NET formation. While stimulation of neutrophils with IgA complexes robustly induced NET formation, complexed IgG only marginally increased the amount of NETs compared to the unstimulated control. Mixing IgA with IgG before heat aggregation did not increase the effect of complexed IgA on neutrophils. By contrast, the presence of IgG complexes seemed to disturb neutrophil stimulation by IgA complexes. The capacity of complexed IgG to induce NET formation could not be increased by the addition of autologous serum or the removal of terminal sialic acid in the Fc glycan. Together, our data show that IgA is a much more potent inducer of NET formation than IgG. IgA may thus be the main driving force in (auto)immune complex-mediated NET formation.
引用
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页数:10
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