Skin inflammation is the most common condition seen in dermatology practice and can be caused by various allergic reactions and certain toxins or chemicals. In the present study, the authors investigated the antiinflammatory effects of Saussurea lappa, a medicinal herb, and its marker compounds alantolactone, caryophyllene, costic acid, costunolide, and dehydrocostuslactone in the HaCaT human keratinocyte cell line. HaCaT cells were stimulated with tumor necrosis factor-alpha (TNF-?) and interferon-gamma (IFN-?), and treated with S.lappa or each of five marker compounds. Chemokine production and expression were analysed by enzyme-linked immunosorbent assay and reverse transcription-polymerase chain reaction, respectively. Phosphorylation of signal transducer and activator of transcription (STAT) 1 was determined by immunoblotting. Stimulation with TNF-? and IFN-? significantly increased the production of the following chemokines: thymus-regulated and activation-regulated chemokine (TARC): regulated on activation, normal T-cell expressed and secreted (RANTES): macrophage-derived chemokine (MDC): and interleukin-8 (IL-8). By contrast, S.lappa and the five marker compounds significantly reduced the production of these chemokines by TNF-? and IFN-?-treated cells. S.lappa and alantolactone suppressed the TNF-? and IFN-?-stimulated increase in the phosphorylation of STAT1. The results demonstrate that alantolactone from S.lappa suppresses TNF-? and IFN-?-induced production of RANTES and IL-8 by blocking STAT1 phosphorylation in HaCaT cells.
Authors: Lim HS, Jin SE, Kim OS, Shin HK, Jeong SJ. ;Full Source: Phytotherapy Research. 2015 Apr 17. doi: 10.1002/ptr.5354. [Epub ahead of print] ;