PubMed:10225377 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/10225377","sourcedb":"PubMed","sourceid":"10225377","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/10225377","text":"Activation of nuclear factor-kappaB by lipopolysaccharide in mononuclear leukocytes is prevented by inhibitors of cytosolic phospholipase A2.\nIn monocytes, lipopolysaccharide induces synthesis and activity of the 85-kDa cytosolic phospholipase A2. This enzyme releases arachidonic acid and lyso-phospholipids from membranes which are metabolized to eicosanoids and platelet-activating-factor. These lipid mediators increase activity of transcription factors and expression of cytokine genes indicating a function for cytosolic phospholipase A2 in signal transduction and inflammation. We have shown previously that trifluoromethylketone inhibitors of cytosolic phospholipase A2 suppressed interleukin-1beta protein and steady-state mRNA levels in human lipopolysaccharide-stimulated peripheral blood mononuclear leukocytes. In this study, the subcellular mechanisms were analyzed by which trifluoromethylketones interfere with gene expression. We found that they reduced the initial interleukin-1beta mRNA transcription rate through prevention of degradation of inhibitor-kappaB alpha. Consequently, cytosolic activation, nuclear translocation and DNA-binding of nuclear factor-kappaB were decreased. Trifluoromethylketones ameliorate chronic inflammation in vivo. Thus, this therapeutic potency may reside in retention of inactive nuclear factor-kappaB in the cytosol thereby abrogating interleukin-1beta gene 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