Development of chronic inflammatory arthropathy resembling rheumatoid arthritis in interleukin 1 receptor antagonist-deficient mice.

Development of chronic inflammatory arthropathy resembling rheumatoid arthritis in interleukin 1 receptor antagonist-deficient mice.
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DOI:
10.1084/jem.191.2.313
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发表时间:
2000-01-17
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Iwakura Y
Iwakura Y
中科院分区:
其他
文献类型:
--
作者:
Horai R;Saijo S;Tanioka H;Nakae S;Sudo K;Okahara A;Ikuse T;Asano M;Iwakura Y

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白细胞介素(IL)-1是一种促炎细胞因子,在炎症、宿主防御和神经-免疫-内分泌网络中发挥重要作用。IL-1受体拮抗剂(ra)是一种内源性IL-1抑制剂,被认为可以调节IL-1的活性。然而,它在体内的病理生理作用仍然很大程度上未知。为了阐明IL-1ra的作用,我们采用基因靶向的方法制备了IL-1ra缺陷小鼠,并在不同的遗传背景下进行了病理分析。我们发现所有具有BALB/cA基因背景的小鼠,而没有C57BL/6J基因背景的小鼠,自发发展为慢性炎症性多关节病。组织病理学显示明显的滑膜和关节周围炎症,由肉芽组织侵入引起的关节糜烂与人类类风湿关节炎非常相似。此外,在这些小鼠中检测到抗免疫球蛋白、II型胶原蛋白和双链DNA的抗体水平升高,表明自身免疫的发展。促炎因子如IL-1β、IL-6和肿瘤坏死因子α在关节中过表达,表明IL-1ra在细胞因子网络中的调节作用。因此,我们表明IL-1ra基因缺乏导致自身免疫和关节特异性炎症,并表明IL-1ra在维持免疫系统稳态中很重要。我们将讨论IL-1ra基因缺失可能与RA的关系。
Interleukin (IL)-1 is a proinflammatory cytokine that plays important roles in inflammation, host defense, and the neuro-immuno-endocrine network. IL-1 receptor antagonist (ra) is an endogenous inhibitor of IL-1 and is supposed to regulate IL-1 activity. However, its pathophysiological roles in a body remain largely unknown. To elucidate the roles of IL-1ra, IL-1ra–deficient mice were produced by gene targeting, and pathology was analyzed on different genetic backgrounds. We found that all of the mice on a BALB/cA background, but not those on a C57BL/6J background, spontaneously developed chronic inflammatory polyarthropathy. Histopathology showed marked synovial and periarticular inflammation, with articular erosion caused by invasion of granulation tissues closely resembling that of rheumatoid arthritis in humans. Moreover, elevated levels of antibodies against immunoglobulins, type II collagen, and double-stranded DNA were detected in these mice, suggesting development of autoimmunity. Proinflammatory cytokines such as IL-1β, IL-6, and tumor necrosis factor α were overexpressed in the joints, indicating regulatory roles of IL-1ra in the cytokine network. We thus show that IL-1ra gene deficiency causes autoimmunity and joint-specific inflammation and suggest that IL-1ra is important in maintaining homeostasis of the immune system. Possible involvement of IL-1ra gene deficiency in RA will be discussed.
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