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• W2094392889 abstract "The endotoxin-mediated production of pro-inflammatory cytokines plays an important role in the pathogenesis of liver disorders. Heat shock protein (Hsp70) overexpression has established functions in lipopolysaccharide (LPS)-mediated inflammatory response. However, little is known about the role of Hsp70 activity in LPS signaling. We hypothesized that inhibition of Hsp70 substrate binding activity can ameliorate LPS-induced liver injury by decreasing induction of pro-inflammatory factors. In this study, C57/BL6 mice were injected intraperitoneally with LPS and 2-phenylethynesulfonamide (PES), an inhibitor of Hsp70 substrate binding activity. We found that i. PES prevented LPS-induced increase in serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activity, infiltration of inflammatory cells, and liver cell apoptosis; ii. PES reduced inducible nitric oxide synthase (iNOS) protein expression as well as serum nitric oxide (NO), tumor necrosis factor-α (TNF-α), and interleukin-6 (IL-6) content in LPS-stimulated mice; iii. PES reduced the mRNA level of iNOS, TNF-α, and IL-6 in LPS-stimulated liver. iiii. PES attenuated the degradation of inhibitor of κB-α (IκB-α) as well as the phosphorylation and nuclear translocation of nuclear factor-κB (NF-κB) in LPS-stimulated liver. Similar changes in the protein expression of inflammatory markers, IκB-α degradation, and NF-κB phosphorylation and nuclear translocation were observed in RAW 264.7 cells. Further mechanistic studies revealed that PES remarkably reduced the elevation of [Ca(2+)]i and intracellular pH value (pHi) in LPS-stimulated RAW 264.7 cells. Furthermore, PES significantly reduced the increase in Na(+)/H(+) exchanger 1 (NHE1) association to Hsp70 in LPS-stimulated macrophages and liver, suggesting that NHE1-Hsp70 interaction is required for the involvement of NHE1 in the inflammation response. In conclusion, inhibition of Hsp70 substrate binding activity in vivo reduces the induction of pro-inflammatory factors and prevents LPS-induced liver injury likely by disrupting NHE1-Hsp70 interaction which consequently reduces the activation of IκB-α-NF-κB pathway in liver." @default.
• W2094392889 created "2016-06-24" @default.
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• W2094392889 date "2013-06-21" @default.
• W2094392889 modified "2023-10-16" @default.
• W2094392889 title "2-phenylethynesulfonamide Prevents Induction of Pro-inflammatory Factors and Attenuates LPS-induced Liver Injury by Targeting NHE1-Hsp70 Complex in Mice" @default.
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• W2094392889 doi "https://doi.org/10.1371/journal.pone.0067582" @default.
• W2094392889 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3689707" @default.
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