TLR9/MyD88 signaling is required for class switching to pathogenic IgG2a and 2b autoantibodies in SLE.

TLR9/MyD88 signaling is required for class switching to pathogenic IgG2a and 2b autoantibodies in SLE.
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DOI:
10.1084/jem.20052438
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发表时间:
2006-03-20
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Ravetch JV
Ravetch JV
中科院分区:
其他
文献类型:
--
作者:
Ehlers M;Fukuyama H;McGaha TL;Aderem A;Ravetch JV

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系统性红斑狼疮 (SLE) 的耐受性丧失会导致自身抗体的产生,这些抗体会在终末器官中积聚,从而诱发疾病。在这里,我们通过招募表达 FcγRIV 的巨噬细胞来证明免疫球蛋白 (Ig)G2a 和 2b 自身抗体是致病同种型。 IgM 抗自身 B 细胞向这些致病亚类的类别转换(而非发育)需要先天免疫受体 Toll 样受体 (TLR)9 和 MyD88 信号传导。如果没有它们,自身反应性 B 细胞向 IgG2a 和 2b 亚类的转换就会被阻断,从而降低病理学和死亡率。相比之下,在 TLR9 缺陷小鼠中,抗自身 B 细胞向 IgG1 的转换不会受到干扰,非自身反应性 IgG2a 和 2b 抗体的生成也不会受到损害。因此,TLR9 通路是 SLE 治疗干预的潜在靶点。
Loss of tolerance in systemic lupus erythematosus (SLE) leads to the generation of autoantibodies, which accumulate in end-organs where they induce disease. Here we show that immunoglobulin (Ig)G2a and 2b autoantibodies are the pathogenic isotypes by recruiting FcγRIV expressing macrophages. Class switching, but not development, of IgM anti-self B cells to these pathogenic subclasses requires the innate immune receptor Toll-like receptor (TLR)9 and MyD88 signaling. In their absence, switching of autoreactive B cells to the IgG2a and 2b subclasses is blocked, resulting in reduced pathology and mortality. In contrast, switching of anti-self B cells to IgG1 is not perturbed and generation of nonautoreactive IgG2a and 2b antibodies is not impaired in TLR9-deficient mice. Thus, the TLR9 pathway is a potential target for therapeutic intervention in SLE.
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影响因子: 3.2
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