Toll-like receptor 9 controls anti-DNA autoantibody production in murine lupus.

Toll-like receptor 9 controls anti-DNA autoantibody production in murine lupus.
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Toll样受体9控制鼠狼疮中的抗DNA自身抗体产生。

DOI:
10.1084/jem.20050338
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发表时间:
2005-07-18
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Shlomchik MJ
Shlomchik MJ
中科院分区:
其他
文献类型:
--
作者:
Christensen SR;Kashgarian M;Alexopoulou L;Flavell RA;Akira S;Shlomchik MJ

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人类和小鼠的系统性自身免疫性疾病的特征是对一组有限的自身核抗原的免疫耐受性丧失。自身抗原,如双链(ds)DNA和含RNA的史密斯抗原(Sm),可能是选择性靶向系统性红斑狼疮,因为它们能够激活一个公认的共同受体。Toll样受体9(TLR9)是一种CpG DNA的受体,在体外与自身反应性B细胞的活化有关,但其在体内促进自身抗体产生和疾病的作用尚未确定。我们发现,在TLR9缺陷型狼疮易感小鼠中,抗dsDNA和抗染色质自身抗体的产生被特异性抑制。其他自身抗体,如抗Sm,在TLR9缺陷小鼠中保持甚至增加。与此相反,TLR3(dsRNA的受体)的消融并不抑制针对含RNA或DNA抗原的自身抗体的形成。令人惊讶的是,我们发现尽管TLR9缺陷小鼠缺乏抗dsDNA自身抗体,但对临床自身免疫性疾病或肾炎的发展没有影响。这些结果证明了TLR9在体内自身抗体形成中的特异性需求,并表明先天免疫激活在自身免疫中的关键作用。
Systemic autoimmune disease in humans and mice is characterized by loss of immunologic tolerance to a restricted set of self-nuclear antigens. Autoantigens, such as double-stranded (ds) DNA and the RNA-containing Smith antigen (Sm), may be selectively targeted in systemic lupus erythematosus because of their ability to activate a putative common receptor. Toll-like receptor 9 (TLR9), a receptor for CpG DNA, has been implicated in the activation of autoreactive B cells in vitro, but its role in promoting autoantibody production and disease in vivo has not been determined. We show that in TLR9-deficient lupus-prone mice, the generation of anti-dsDNA and antichromatin autoantibodies is specifically inhibited. Other autoantibodies, such as anti-Sm, are maintained and even increased in TLR9-deficient mice. In contrast, ablation of TLR3, a receptor for dsRNA, did not inhibit the formation of autoantibodies to either RNA- or DNA-containing antigens. Surprisingly, we found that despite the lack of anti-dsDNA autoantibodies in TLR9-deficient mice, there was no effect on the development of clinical autoimmune disease or nephritis. These results demonstrate a specific requirement for TLR9 in autoantibody formation in vivo and indicate a critical role for innate immune activation in autoimmunity.
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