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
中科院分区:
文献类型:
--
作者:
Kneidl ;B. Löffler ;D. Holzinger;J. Roth;K. Barczyk
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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作者:
Kneidl, Jessica;Loeffler, Bettina;Barczyk, Katarzyna
通讯作者:
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