Anti-inflammatory activities and mechanisms of Artemisia asiatica ethanol extract

Deok Jeong, Young Su Yi, Gi Ho Sung, Woo Seok Yang, Jae Gwang Park, Keejung Yoon, Deok Hyo Yoon, Changsik Song, Yunmi Lee, Man Hee Rhee, Tae Woong Kim, Jong Hoon Kim, Jae Youl Cho

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Ethnopharmacological relevance Artemisia asiatica Nakai (Compositae) is a representative herbal plant used to treat infection and inflammatory diseases. Although Artemisia asiatica is reported to have immunopharmacological activities, the mechanisms of these activities and the effectiveness of Artemisia asiatica preparations in use are not known. Materials and methods To evaluate the anti-inflammatory activities of Artemisia asiatica ethanol extract (Aa-EE), we assayed nitric oxide (NO), tumor necrosis factor (TNF)-α, and prostaglandin E2 (PGE2) in macrophages and measured the extent of tissue injury in a model of gastric ulcer induced in mice by treatment with HCl in EtOH. Putative enzymatic mediators of Aa-EE activities were identified by nuclear fractionation, reporter gene assay, immuoprecipitation, immunoblotting, and kinase assay. Active compound in Aa-EE was identified using HPLC. Results Treatment of RAW264.7 cells and peritoneal macrophages with Aa-EE suppressed the production of NO, PGE2, and TNF-α in response to lipopolysaccharide (LPS) and induced heme oxygenase-1 expression. The Aa-EE also ameliorated symptoms of gastric ulcer in HCl/EtOH-treated mice. These effects were associated with the inhibition of nuclear translocation of nuclear factor (NF)-κB and activator protein (AP)-1, implying that the anti-inflammatory action of the Aa-EE occurred through transcriptional inhibition. The upstream regulatory signals Syk and Src for translocation of NF-κB and TRAF6 for AP-1 were identified as targets of this effect. Analysis of Aa-EE by HPLC revealed the presence of luteolin, known to inhibit NO and PGE2 activity. Conclusion The anti-inflammatory activities attributed to Artemisia asiatica Nakai in traditional medicine may be mediated by luteolin through inhibition of Src/Syk/NF-κB and TRAF6/JNK/AP-1 signaling pathways.

Original languageEnglish
Pages (from-to)487-496
Number of pages10
JournalJournal of Ethnopharmacology
Volume152
Issue number3
DOIs
StatePublished - 28 Mar 2014

Keywords

  • Artemisia asiatica Nakai
  • Compositae
  • Gastric ulcer
  • Inflammatory mediator
  • Target enzyme
  • Transcription factor

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