Cutting Edge: Deletion of Ezrin in B Cells of Lyn-Deficient Mice Downregulates Lupus Pathology.

Cutting Edge: Deletion of Ezrin in B Cells of Lyn-Deficient Mice Downregulates Lupus Pathology.
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DOI:
10.4049/jimmunol.1800168
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发表时间:
2018-09-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Gupta N
Gupta N
中科院分区:
其他
文献类型:
--
作者:
Pore D;Huang E;Dejanovic D;Parameswaran N;Cheung MB;Gupta N

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小鼠Src家族酪氨酸激酶林恩的基因缺失重现了人类系统性红斑狼疮,其特征在于过度活跃的B细胞抗原受体(BCR)信号传导、脾肿大、自身抗体产生和肾小球肾炎。然而,在Lyn-deficient小鼠和人类狼疮中,自身免疫的分子调节剂仍然缺乏特征。在这里,我们报告说,有条件删除的膜细胞骨架连接蛋白埃兹蛋白在B细胞的Lyn-deficient小鼠(DKO小鼠)改善B细胞活化和狼疮发病机制。来自DKO小鼠的B细胞对BCR刺激的反应较差,主要信号传导途径严重下调。DKO小鼠表现出减轻的脾肿大以及针对多种自身抗原(包括dsDNA、组蛋白和染色质)的显著较低水平的自身抗体。DKO小鼠肾小球中的白细胞浸润以及IgG和补体成分C3的沉积显著减少。我们的数据表明,ezrin是一种新的分子调节B细胞相关的狼疮病理。
Genetic deletion of the Src family tyrosine kinase Lyn in mice recapitulates human systemic lupus erythematosus, characterized by hyperactive B cell antigen receptor (BCR) signaling, splenomegaly, autoantibody generation and glomerulonephritis. However, the molecular regulators of autoimmunity in Lyn-deficient mice and in human lupus remain poorly characterized. Here, we report that conditional deletion of the membrane-cytoskeleton linker protein ezrin in B cells of Lyn-deficient mice (DKO mice) ameliorates B cell activation and lupus pathogenesis. B cells from DKO mice respond poorly to BCR stimulation, with severe downregulation of major signaling pathways. DKO mice exhibit reduced splenomegaly as well as significantly lower levels of autoantibodies against a variety of autoantigens, including dsDNA, histone and chromatin. Leukocyte infiltration, and deposition of IgG and complement component C3 in the kidney glomeruli of DKO mice is markedly reduced. Our data demonstrate that ezrin is a novel molecular regulator of B cell-associated lupus pathology.
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