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• W2089494615 endingPage "H884" @default.
• W2089494615 startingPage "H874" @default.
• W2089494615 abstract "Myeloid differentiation factor 88 (MyD88) and NF-κB play central roles in mediating signal transduction of the Toll-like receptor (TLR) superfamily in human macrophages. The feedback regulation of LDL receptor (LDLR) and 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoAR) are mediated by the sterol regulatory element-binding protein (SREBP) cleavage-activating protein (SCAP)-SREBP2 pathway and are key regulatory elements for cholesterol homeostasis in human cells. This study was designed to investigate cross-talk between TLR4-MyD88-NF-κB and SCAP-SREBP2 pathways in macrophage foam cell formation. phorbol 12-myristate 13-acetate-activated THP-1 macrophages were transfected with negative control or MyD88 small interfering (si)RNA. Transfected cells were incubated with LPS in the absence or presence of LDL or IκB kinase (IKK) inhibitor (BMS-345541). Intracellular cholesterol content was assessed. mRNA and protein expression of LDLR, HMG-CoAR, SCAP, and SREBP2 were examined by real-time RT-PCR and Western blot analysis. Intracellular translocation of SCAP in the organelles was detected by immunofluorecence and confocal microscopy. We demonstrated that LPS-induced cholesterol accumulation was attenuated by applying siRNA against MyD88 in the absence or presence of LDL. LPS increased both gene and protein expression of LDLR and HMG-CoAR by increasing expression and abnormal translocation of SCAP from the endoplasmic reticulum to the Golgi. These effects were blocked by knockdown of MyD88 or blockade of IKK or by knockdown of SCAP, suggesting that the cross-talk between NF-κB and SCAP plays an important role in macrophage foam cell formation and that interfering with the cross-talk might be a potential approach in preventing LPS-induced macrophage foam cell formation." @default.
• W2089494615 created "2016-06-24" @default.
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• W2089494615 date "2013-03-15" @default.
• W2089494615 modified "2023-09-25" @default.
• W2089494615 title "Cross-talk between TLR4-MyD88-NF-κB and SCAP-SREBP2 pathways mediates macrophage foam cell formation" @default.
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• W2089494615 doi "https://doi.org/10.1152/ajpheart.00096.2012" @default.
• W2089494615 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23335792" @default.
• W2089494615 hasPublicationYear "2013" @default.
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