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排序方式: 共有82条查询结果,搜索用时 265 毫秒
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Charys Palmer Fabio A Facchini Richard PO Jones Frank Neumann Francesco Peri Grisha Pirianov 《Innate immunity》2021,27(3):275
TLRs, including TLR4, play a crucial role in inflammatory-based diseases, and TLR4 has been identified as a therapeutic target for pharmacological intervention. In previous studies, we investigated the potential of FP7, a novel synthetic glycolipid active as a TLR4 antagonist, to inhibit haematopoietic and non-haematopoietic MyD88-dependent TLR4 pro-inflammatory signalling. The main aim of this study was to investigate the action of FP7 and its derivative FP12 on MyD88-independent TLR4 signalling in THP-1 derived macrophages. Western blotting, Ab array and ELISA approaches were used to explore the effect of FP7 and FP12 on TRIF-dependent TLR4 functional activity in response to LPS and other endogenous TLR4 ligands in THP-1 macrophages. A different kinetic in the inhibition of endotoxin-driven TBK1, IRF3 and STAT1 phosphorylation was observed using different LPS chemotypes. Following activation of TLR4 by LPS, data revealed that FP7 and FP12 inhibited TBK1, IRF3 and STAT1 phosphorylation which was associated with down-regulation IFN-β and IP-10. Specific blockage of the IFN type one receptor showed that these novel molecules inhibited TRIF-dependent TLR4 signalling via IFN-β pathways. These results add novel information on the mechanism of action of monosaccharide FP derivatives. The inhibition of the TRIF-dependent pathway in human macrophages suggests potential therapeutic uses for these novel TLR4 antagonists in pharmacological interventions on inflammatory diseases. 相似文献
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Heat shock response reduces intestinal permeability in septic mice: potential role of interleukin-10
Wang Q Hasselgren PO 《American journal of physiology. Regulatory, integrative and comparative physiology》2002,282(3):R669-R676
Sepsis and other critical illnesses are associated with increased permeability of the intestinal mucosa. Loss of mucosal integrity may lead to multiple organ failure in these conditions. We tested the hypothesis that induction of the heat shock response reduces sepsis-induced increase in intestinal permeability. The heat shock response was induced in mice by intraperitoneal injection of 10 mg/kg sodium arsenite. Two hours later, at which time mucosal heat shock protein 72 levels were increased, sepsis was induced by cecal ligation and puncture (CLP) or sham operation was performed. Sixteen hours after sham operation or CLP, intestinal permeability was determined by measuring the appearance in blood of 4.4-kDa fluorescein isothiocyanate-conjugated dextran and 40-kDa horseradish peroxidase administered by gavage. Sepsis resulted in increased mucosal permeability for both markers, and this effect of sepsis was substantially reduced in mice treated with sodium arsenite. Plasma levels of the anti-inflammatory cytokine interleukin (IL)-10 were increased in septic mice pretreated with sodium arsenite, and the protective effect of sodium arsenite on intestinal permeability in septic mice was reversed by treatment with anti-IL-10 antibody. The present results suggest that sepsis-induced increase in mucosal permeability can be reduced by the heat shock response and that increased IL-10 levels may be involved in the protective effects of the heat shock response. 相似文献
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Hershko DD Robb BW Luo GJ Hungness ES Hasselgren PO 《Journal of cellular biochemistry》2003,90(3):627-640
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Fareed MU Evenson AR Wei W Menconi M Poylin V Petkova V Pignol B Hasselgren PO 《American journal of physiology. Regulatory, integrative and comparative physiology》2006,290(6):R1589-R1597
Muscle wasting in sepsis is a significant clinical problem because it results in muscle weakness and fatigue that may delay ambulation and increase the risk for thromboembolic and pulmonary complications. Treatments aimed at preventing or reducing muscle wasting in sepsis, therefore, may have important clinical implications. Recent studies suggest that sepsis-induced muscle proteolysis may be initiated by calpain-dependent release of myofilaments from the sarcomere, followed by ubiquitination and degradation of the myofilaments by the 26S proteasome. In the present experiments, treatment of rats with one of the calpain inhibitors calpeptin or BN82270 inhibited protein breakdown in muscles from rats made septic by cecal ligation and puncture. The inhibition of protein breakdown was not accompanied by reduced expression of the ubiquitin ligases atrogin-1/MAFbx and MuRF1, suggesting that the ubiquitin-proteasome system is regulated independent of the calpain system in septic muscle. When incubated muscles were treated in vitro with calpain inhibitor, protein breakdown rates and calpain activity were reduced, consistent with a direct effect in skeletal muscle. Additional experiments suggested that the effects of BN82270 on muscle protein breakdown may, in part, reflect inhibited cathepsin L activity, in addition to inhibited calpain activity. When cultured myoblasts were transfected with a plasmid expressing the endogenous calpain inhibitor calpastatin, the increased protein breakdown rates in dexamethasone-treated myoblasts were reduced, supporting a role of calpain activity in atrophying muscle. The present results suggest that treatment with calpain inhibitors may prevent sepsis-induced muscle wasting. 相似文献
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