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GRP78 Impairs Production of Lipopolysaccharide-Induced Cytokines by interaction with CD14

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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
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关键词: GRP78 lipopolysaccharide toll-like receptor 4 CD14 endocytosis

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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.

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出版当年[2016]版
大类 | 2 区 医学
小类 | 2 区 免疫学
最新[2025]版:
大类 | 2 区 医学
小类 | 2 区 免疫学
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Q1 IMMUNOLOGY
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Q1 IMMUNOLOGY

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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
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