期刊
ANNALS OF THE RHEUMATIC DISEASES
卷 74, 期 7, 页码 1425-1431出版社
BMJ PUBLISHING GROUP
DOI: 10.1136/annrheumdis-2013-204543
关键词
-
类别
资金
- Toulouse III University
- CNRS
- INSERM
- Fondation Arthritis
- Societe Francaise de Rhumatologie
Objectives Anticitrullinated protein antibodies (ACPA) are specifically associated with rheumatoid arthritis (RA) and produced in inflamed synovial membranes where citrullinated fibrin, their antigenic target, is abundant. We showed that immune complexes containing IgG ACPA (ACPA-IC) induce Fc gamma R-mediated tumour necrosis factor (TNF)-alpha secretion in macrophages. Since IgM rheumatoid factor (RF), an autoantibody directed to the Fc fragment of IgG, is also produced and concentrated in the rheumatoid synovial tissue, we evaluated its influence on macrophage stimulation by ACPA-IC. Methods With monocyte-derived macrophages from more than 40 healthy individuals and different human IgM cryoglobulins with RF activity, using a previously developed human in vitro model, we evaluated the effect of the incorporation of IgM RF into ACPA-IC. Results IgM RF induced an important amplification of the TNF-alpha secretion. This effect was not observed in monocytes and depended on an increase in the number of IgG-engaged Fc gamma R. It extended to the secretion of interleukin (IL)-1 beta and IL-6, was paralleled by IL-8 secretion and was not associated with overwhelming secretion of IL-10 or IL-1Ra. Moreover, the RF-induced increased proinflammatory bioactivity of the cytokine response to ACPA-IC was confirmed by an enhanced, not entirely TNF-dependent, capacity of the secreted cytokine cocktail to prompt IL-6 secretion by RA synoviocytes. Conclusions By showing that it can greatly enhance the proinflammatory cytokine response induced in macrophages by the RA-specific ACPA-IC, these results highlight a previously undescribed, Fc gamma R-dependent strong proinflammatory potential of IgM RF. They clarify the pathophysiological link between the presence of ACPA and IgM RF, and RA severity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据