Reduced B lymphoid kinase (Blk) expression enhances proinflammatory cytokine production and induces nephrosis in C57BL/6-lpr/lpr mice.

Reduced B lymphoid kinase (Blk) expression enhances proinflammatory cytokine production and induces nephrosis in C57BL/6-lpr/lpr mice.
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DOI:
10.1371/journal.pone.0092054
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Hayes SM
Hayes SM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Samuelson EM;Laird RM;Papillion AM;Tatum AH;Princiotta MF;Hayes SM

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BLK基因编码B淋巴样蛋白激酶,最近在全基因组关联研究中被确定为系统性红斑狼疮(SLE)的易感基因,而BLK基因座的风险等位基因定位导致基因表达降低。为了确定BLK是否是真正的易感基因,我们开发了一个实验小鼠模型,即BLK+/−.lpr/lpr(BLK+/−.lpr)小鼠,在该模型中,BLK的表达水平降低到与携带风险等位基因的个体相当的水平。在这里,我们报道BLK不仅在B细胞中表达,而且在产生IL-17的γδ和DNαβT细胞以及浆细胞样树突状细胞(PDCs)中也表达。此外,我们发现,在C57BL/6-LPR/LPR小鼠中,单独减少Blk的表达会增加促炎细胞因子的产生,并加速淋巴增殖、蛋白尿和肾脏疾病的发生。总之,这些发现表明,BLK风险等位基因通过促炎症细胞因子网络的失调而增加SLE的易感性。
BLK, which encodes B lymphoid kinase, was recently identified in genome wide association studies as a susceptibility gene for systemic lupus erythematosus (SLE), and risk alleles mapping to the BLK locus result in reduced gene expression. To determine whether BLK is indeed a bona fide susceptibility gene, we developed an experimental mouse model, namely the Blk+/−.lpr/lpr (Blk+/−.lpr) mouse, in which Blk expression levels are reduced to levels comparable to those in individuals carrying a risk allele. Here, we report that Blk is expressed not only in B cells, but also in IL-17-producing γδ and DN αβ T cells and in plasmacytoid dendritic cells (pDCs). Moreover, we found that solely reducing Blk expression in C57BL/6-lpr/lpr mice enhanced proinflammatory cytokine production and accelerated the onset of lymphoproliferation, proteinuria, and kidney disease. Together, these findings suggest that BLK risk alleles confer susceptibility to SLE through the dysregulation of a proinflammatory cytokine network.
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