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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Inhibition of lipopolysaccharide-inducible nitric oxide synthase, TNF-alpha and COX-2 expression by sauchinone effects on I-kappaBalpha phosphorylation, C/EBP and AP-1 activation.
British Journal of Pharmacology 2003 May
1. Sauchinone, a lignan isolated from Saururus chinensis (Saururaceae), is a diastereomeric lignan with cytoprotective and antioxidant activities in cultured hepatocytes. The effects of sauchinone on the inducible nitric oxide synthase (iNOS), tumor necrosis factor-alpha (TNF-alpha) and cyclooxygenase 2 (COX-2) gene expression and on the activation of transcription factors, nuclear factor-kappaB (NF-kappaB), CCAAT/enhancer-binding protein (C/EBP), activator protein-1 (AP-1) and cAMP-response element-binding protein (CREB) were determined in Raw264.7 cells as part of the studies on its anti-inflammatory effects. 2. Expression of the iNOS, TNF-alpha and COX-2 genes was assessed by Northern and Western blot analyses. NO production was monitored by chemiluminescence detection using a NO analyzer. To identify the transcriptional factors affected by sauchinone, the extents of NF-kappaB, C/EBP, AP-1 and CREB activation were measured. Activation of the transcription factors was monitored by gel mobility shift assay, whereas p65 and I-kappaBalpha were analyzed by immunocytochemical and immunoblot analyses. 3. Sauchinone inhibited the induction of iNOS, TNF-alpha and COX-2 by lipopolysaccharide (LPS) (IC50
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