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  • Title: Phenolic-rich fraction from Rhus verniciflua Stokes (RVS) suppress inflammatory response via NF-kappaB and JNK pathway in lipopolysaccharide-induced RAW 264.7 macrophages.
    Author: Jung CH, Kim JH, Hong MH, Seog HM, Oh SH, Lee PJ, Kim GJ, Kim HM, Um JY, Ko SG.
    Journal: J Ethnopharmacol; 2007 Apr 04; 110(3):490-7. PubMed ID: 17112694.
    Abstract:
    The effects of phenolic-rich fraction (PRF) from Rhus verniciflua Stokes (Anacardiaceae) on the activities of cellular signaling molecules that mediate inflammatory responses in LPS-induced RAW 264.7 macrophages were investigated. At various concentrations of PRF significantly inhibited NO, PGE(2) and TNF-alpha production in LPS-induced RAW 264.7 macrophage cells. The PRF also significantly inhibited iNOS and COX-2 protein expression in LPS-induced RAW 264.7 macrophage in a concentration-dependent manner. Transcription factor NF-kappaB plays a key role for the inducible expression of genes mediating proinflammatory effects and here, we show that PRF can inhibit the induction of NF-kappaB activity. The PRF effectively inhibited the iNOS and COX-2 protein expression through suppression of phospho-JNK1/2 activation. Study using PDA HPLC has found that the PRF contains several low molecular compounds (i.e. p-coumaric acid, fustin, kaempferol-3-O-glucoside, sulfuretin, butein, kaempferol). Our results indicate that the anti-inflammatory properties of PRF might result from the inhibition of pro-inflammatory mediators (e.g., NO, PGE(2) and TNF-alpha) by suppression of such signaling pathways as NF-kappaB and JNK1/2.
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