Regulation of Human Neutrophil Fcγ Receptor IIa by C5a Receptor Promotes Inflammatory Arthritis in Mice

被引:59
作者
Tsuboi, Naotake
Ernandez, Thomas
Li, Xun
Nishi, Hiroshi
Cullere, Xavier
Mekala, Divya
Hazen, Melissa
Koehl, Joerg [2 ,3 ,4 ]
Lee, David M.
Mayadas, Tanya N. [1 ]
机构
[1] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Pathol,Ctr Excellence Vasc Biol, Boston, MA 02115 USA
[2] Univ Lubeck, Lubeck, Germany
[3] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH USA
[4] Univ Cincinnati, Coll Med, Cincinnati, OH USA
来源
ARTHRITIS AND RHEUMATISM | 2011年 / 63卷 / 02期
关键词
RHEUMATOID-ARTHRITIS; AUTOIMMUNE-DISEASE; MAST-CELLS; IMMUNE-COMPLEXES; MOUSE MODEL; COMPLEMENT; RIIA; RECRUITMENT; ACTIVATION; ANTIBODIES;
D O I
10.1002/art.30141
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective. Rheumatoid arthritis culminates in joint destruction that, in mouse models of disease, is supported by innate immune molecules, including Fc gamma receptors (Fc gamma R) and complement. However, these findings may not be predictive of the outcome in humans, given the structural differences between murine and human activating Fc gamma R on neutrophils, a prominent component of joint exudates. The aim of this study was to examine the role of human neutrophil Fc gamma RIIa in the development of arthritis and probe the underlying mechanism by which Fc gamma RIIa initiates disease. Methods. K/BxN mouse serum transfer-induced arthritis was examined in mice expressing human Fc gamma RIIa on neutrophils but lacking their own activating Fc gamma R (gamma-chain-deficient mice). The role of mast cells, complement (C3 and C5a), and CD18 integrins in Fc gamma RIIa-initiated disease was examined using cell reconstitution approaches, inhibitors, and functional blocking antibodies, respectively. Crosstalk between the complement receptor C5aR and Fc gamma RIIa on neutrophils was evaluated in vitro. Results. The expression of human Fc gamma RIIa on neutrophils was sufficient to restore susceptibility to K/BxN serum-induced neutrophil recruitment, synovitis, and bone destruction in gamma-chain-deficient mice. Joint inflammation was robust and proceeded even in the absence of mast cells and vascular permeability, features shown to contribute to disease in wild-type mice. Neutrophil recruitment was dependent on the presence of a CD18 integrin, lymphocyte function-associated antigen 1, and C5aR. In addition, C5aR significantly enhanced Fc gamma RIIa-mediated phagocytosis and oxidative burst in vitro. Conclusion. Human and murine activating Fc gamma R on neutrophils are not functionally equivalent, and in humans, they may play a primary role in arthritis. Crosstalk between neutrophil C5aR and Fc gamma RIIa is essential for disease progression, thus highlighting a new aspect of complement during the effector phase of inflammatory arthritis.
引用
收藏
页码:467 / 478
页数:12
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