The 78-kDa glucose-regulated protein (GRP78) is a stress-inducible chaperone that resides primarily in the endoplasmic reticulum. GRP78 has been described to be released at times of cellular stress and as having extracellular properties that are anti-inflammatory or favor the resolution of inflammation. In the current study, we confirmed that GRP78 impaired the production of lipopolysaccharide-induced pro-inflammatory cytokines in GRP78-treated bone-marrow-derived dendritic cells (DCs). To explore the underlying mechanism, first of all, GRP78 was checked to be bound to the plasma membrane. Interestingly, such binding promoted endocytosis of toll-like receptor (TLR) 4 and reduction in TLR4 on the plasma surface had a key role in desensitization of GRP78-treated DCs to lipopolysaccharide. Given that cluster of differentiation (CD) 14 is a crucial regulator of TLR4 endocytosis, interaction of GRP78 with CD14 was investigated next. Data showed that GRP78 co-localized with CD14 on the plasma membrane and glutathione-S-transferase-GRP78 precipitated CD14. In CD14 knockout mice, down-regulation of tumor necrosis factor-alpha and reduction in TLR4 on the plasma surface were abrogated in GRP78-treated DCs. Overall, these data suggested that GRP78 mediates endocytosis of TLR4 by targeting CD14 to favor the resolution of inflammation.
基金:
National Natural Science Foundation of China [81102219, 81373152]; National Basic Research Program of China [2013CB530505]; Huazhong University of Science and Technology [0118650051]
第一作者单位:[1]Huazhong Univ Sci & Technol, Sch Basic Med, Dept Immunol, Tongji Med Coll, Wuhan, Peoples R China[2]Huazhong Univ Sci & Technol,Inst Integrated Tradit Chinese & Western Med,Tongji Hosp,Tongji Med Coll,Wuhan,Peoples R China
通讯作者:
推荐引用方式(GB/T 7714):
Qin Kai,Ma Simin,Li Heli,et al.GRP78 Impairs Production of Lipopolysaccharide-Induced Cytokines by interaction with CD14[J].FRONTIERS IN IMMUNOLOGY.2017,8:doi:10.3389/fimmu.2017.00579.
APA:
Qin, Kai,Ma, Simin,Li, Heli,Wu, Min,Sun, Yuanli...&Shen, Guanxin.(2017).GRP78 Impairs Production of Lipopolysaccharide-Induced Cytokines by interaction with CD14.FRONTIERS IN IMMUNOLOGY,8,
MLA:
Qin, Kai,et al."GRP78 Impairs Production of Lipopolysaccharide-Induced Cytokines by interaction with CD14".FRONTIERS IN IMMUNOLOGY 8.(2017)