Soluble CD163 masks fibronectin‐binding protein A‐mediated inflammatory activation of Staphylococcus aureus infected monocytes

Soluble CD163 masks fibronectin‐binding protein A‐mediated inflammatory activation of Staphylococcus aureus infected monocytes
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可溶性 CD163 掩盖纤连蛋白结合蛋白 A 介导的金黄色葡萄球菌感染单核细胞的炎症激活

DOI:
10.1111/cmi.12225
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发表时间:
2014
影响因子:
3.4
通讯作者:
K. Barczyk
K. Barczyk
中科院分区:
生物学2区
文献类型:
--
作者:
Kneidl ;B. Löffler ;D. Holzinger;J. Roth;K. Barczyk

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金黄色葡萄球菌(Staphylococcus aureus)与纤维连接蛋白(Fibronectin,FN)的结合是其重要的致病因子,由纤维连接蛋白结合蛋白A(Fibronectin-binding protein A,FnBP-A)和细胞外粘附蛋白(Extracellular adhesion protein,Eap)介导。最近,我们发现可溶性CD 163(sCD 163)与连接这些分子的FN结合,通过增强金黄色葡萄球菌感染的单核细胞的吞噬和杀伤活性,表现出抗微生物作用。然而,尚不清楚sCD 163是否也影响单核细胞活化状态。使用基因修饰的葡萄球菌菌株,我们现在确定了FnBP-A,而不是Eap,作为单核细胞对感染的炎症反应的激活剂。FnBP-A介导的炎症激活被sCD 163与金黄色葡萄球菌结合所掩盖,从而促进有效的病原体清除。因此,sCD 163通过抑制促炎细胞因子TNF α、IL-1 β、IL-6和IL-8以及DAMP分子MRP 8/14的分泌,保护单核细胞免受葡萄球菌感染后的过度活化。此外,sCD 163限制了金黄色葡萄球菌感染过程中诱导的促凋亡转录因子NR4A1的表达,并抑制了促进葡萄球菌体内存活的趋化因子CXCL 2的诱导。sCD 163介导的效应不是由于一般免疫抑制,因为在sCD 163结合细菌感染单核细胞期间,MAP激酶活化和ROS产生没有改变。因此,sCD 163促进免疫系统对FnBP ‐ A介导的炎症激活的特异性防御,从而成功消除病原体、组织恢复和炎症消退。
Binding to fibronectin (FN) is a crucial pathogenic factor ofStaphylococcus aureusmediated by fibronectin‐binding protein A (FnBP‐A) and extracellular adherence protein (Eap). Recently, we have shown that binding of soluble CD163 (sCD163) to FN linked to these molecules exhibits anti‐microbial effects by enhancing phagocytosis and killing activity ofS. aureus‐infected monocytes. However, it remained unclear whether sCD163 also influences the monocytic activation status. Using genetically modified staphylococcal strains we now identified FnBP‐A, but not Eap, as activator of the inflammatory response of monocytes to infection. FnBP‐A‐mediated inflammatory activation was masked by sCD163 binding toS. aureuspromoting efficient pathogen elimination. Thus, sCD163 protects monocytes from overwhelming activation upon staphylococcal infection by dampening the secretion of pro‐inflammatory cytokines TNFα, IL‐1β, IL‐6 and IL‐8 and DAMP molecule MRP8/14. Moreover, sCD163 limited expression of pro‐apoptotic transcription factor NR4A1 induced duringS. aureusinfection and inhibited induction of chemokine CXCL2promoting survival of staphylococciin vivo. sCD163‐mediated effects were not due to general immunosuppression since MAP kinase activation and ROS production were unaltered during infection of monocytes with sCD163‐bound bacteria. Thus, sCD163 promotes a specific defence of the immune system against FnBP‐A‐mediated inflammatory activation enabling successful pathogen elimination, tissue recovery and resolution of inflammation.
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