Induction of Anti-agrin Antibodies Causes Myasthenia Gravis in Mice.

Induction of Anti-agrin Antibodies Causes Myasthenia Gravis in Mice.
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抗聚集蛋白抗体的诱导导致小鼠重症肌无力

DOI:
10.1016/j.neuroscience.2018.01.015
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发表时间:
2018-03-01
期刊:
影响因子:
3.3
通讯作者:
Mei L
Mei L
中科院分区:
医学3区
文献类型:
--
作者:
Yan M;Liu Z;Fei E;Chen W;Lai X;Luo B;Chen P;Jing H;Pan JX;Rivner MH;Xiong WC;Mei L

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重症肌无力(MG)是一种神经肌肉接头(NMJ)的自身免疫性疾病。大多数MG病例是由针对乙酰胆碱受体(AChR)、肌肉特异性激酶(MuSK)和低密度脂蛋白受体相关蛋白4(LRP4)的自身抗体引起的。最近的研究在缺乏这三种抗体的MG患者(即三阴性MG)中发现了抗集聚蛋白抗体。集聚蛋白是一种基底膜蛋白,有两种亚型。神经集聚蛋白(N - 集聚蛋白)与LRP4结合,激活MuSK以诱导AChR簇集,因此对NMJ的形成至关重要。我们证明,用N - 集聚蛋白免疫的小鼠出现了与MG相关的症状,包括肌无力、NMJ破碎和变形。而注射肌肉集聚蛋白(M - 集聚蛋白,一种在诱导AChR簇集方面无活性的亚型)的小鼠则未观察到这些效应。用抗N - 集聚蛋白抗体而非抗M - 集聚蛋白抗体处理,可减少集聚蛋白诱导的肌肉细胞中AChR簇集。综上所述,这些观察结果表明,集聚蛋白抗体可能在MG的发病机制中发挥作用。
Myasthenia gravis (MG) is an autoimmune disorder of the neuromuscular junction (NMJ). Most cases of MG are caused by autoantibodies against the acetylcholine receptor (AChR), muscle-specific kinase (MuSK) and low-density lipoprotein receptor-related protein 4 (LRP4). Recent studies have identified anti-agrin antibodies in MG patients lacking these three antibodies (i.e., triple negative MG). Agrin is a basal lamina protein that has two isoforms. Neural agrin (N-agrin) binds to LRP4 to activate MuSK to induce AChR clusters and is thus critical for NMJ formation. We demonstrate that mice immunized with N-agrin showed MG-associated symptoms including muscle weakness, fragmented and distorted NMJs. These effects were not observed in mice injected with muscle agrin (M-agrin), an isoform that is inactive in inducing AChR clusters. Treatment with anti-N-agrin, but not anti-M-agrin, antibodies reduced agrin-induced AChR clusters in muscle cells. Together, these observations suggest that agrin antibodies may be play a role in MG pathogenesis.
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发表时间: 2014-10-15
影响因子: 5.3
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