Factor VIII Fc Fusion Protein but not FVIII Drives Human Monocyte-Derived Dendritic Cell Activation via FcγRIIa

被引:4
|
作者
Kannicht, Christoph [1 ]
Danssmann, Ilona [1 ]
Weilandt, Constanze [1 ]
Derkow, Katja [1 ]
Kohla, Guido [1 ]
Geyer, Henriette [1 ]
机构
[1] Octapharma Biopharmaceut GmbH, Mol Biochem, Walther Nernst Str 3, D-12489 Berlin, Germany
来源
HEMASPHERE | 2020年 / 4卷 / 01期
关键词
RECOMBINANT FACTOR-VIII; VON-WILLEBRAND-FACTOR; ANTIINFLAMMATORY ACTIVITY; PROLONGED ACTIVITY; RECEPTORS; IMMUNOGENICITY; MATURATION; IGG; REGULATORS; MANAGEMENT;
D O I
10.1097/HS9.0000000000000330
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
This study compares the effect of recombinant Factor VIII Fc fusion protein (rFVIII-Fc) with recombinant FVIII (rFVIII) on monocyte-derived dendritic cells (moDC's). Cells treated with rFVIII-Fc showed morphological changes typical for cell activation, had a significant up-regulation of cell activation markers and produced higher levels of pro-inflammatory cytokines. Even after stimulation with Lipopolysaccharides, the addition of rFVIII-Fc led to increased expression of activation markers, indicating that rFVIII-Fc is capable of amplifying the maturation signal. On the contrary, cultivation of moDC's with rFVIII did not alter cell morphology or increase surface activation marker expression and pro-inflammatory cytokine production. The binding of the Fc domain to the activating Fc gamma receptor IIa (Fc gamma RIIa) can cause cell activation. Therefore, the effect of rFVIII-Fc on Fc gamma RIIa was analyzed in detail. Cultivation of moDC's with rFVIII-Fc led to increased phosphorylation of Fc gamma RIIa, which was not detected for rFVIII. Blocking Fc gamma RIIa prior to the cultivation with rFVIII-Fc significantly reduced the activating effect of rFVIII-Fc, indicating that rFVIII-Fc-induced moDC activation was caused by Fc gamma RIIa. Moreover, rFVIII-Fc bound to FCGR2A-transfected human embryonic kidney 293 cells. Taken together, our data present a new mechanism of moDC activation by rFVIII-Fc via Fc gamma RIIa.
引用
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页数:14
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