Mast Cell Stabilizing Effect of (-)‐Elema‐1,3,11(13)‐trien‐12‐ol and Thujopsene from Thujopsis dolabrata Is Mediated by Down‐Regulation of Interleukin‐4 Secretion in Antigen‐Induced RBL‐2H3 Cells

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  • Kim Chul-Hee
    Natural Products Research Institute, College of Pharmacy, Seoul National University
  • Lee Taehun
    Natural Products Research Institute, College of Pharmacy, Seoul National University
  • Oh Ikhoon
    Natural Products Research Institute, College of Pharmacy, Seoul National University
  • Nam Kung-Woo
    Office of Industrial Cooperation, Soon Chun Hyang University
  • Kim Kyeong Ho
    College of Pharmacy, Kangwon National University
  • Oh Ki-Bong
    School of Agriculture Biotechnology, Seoul National University
  • Shin Jongheon
    Natural Products Research Institute, College of Pharmacy, Seoul National University
  • Mar Woongchon
    Natural Products Research Institute, College of Pharmacy, Seoul National University

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  • Mast Cell Stabilizing Effect of (−)-Elema-1,3,11(13)-trien-12-ol and Thujopsene from <i>Thujopsis dolabrata</i> Is Mediated by Down-Regulation of Interleukin-4 Secretion in Antigen-Induced RBL-2H3 Cells

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Several isolated compounds from the wood part of Thujopsis dolabrata were evaluated for their inhibitory effects against antigen-induced mast cell degranulation and interleukin-4 (IL-4) secretion, as well as IL-4 mRNA and protein expression in immunoglobulin E (IgE)-sensitized RBL-2H3 cells. Among the five isolated compounds, (−)-elema-1,3,11(13)-trien-12-ol (1) and thujopsene (2) exhibited the potent inhibitory activity against mast cell degranulation measured by β-hexosaminidase release with IC50 values of 27.4 µM and 25.1 µM, respectively. These compounds also inhibited the release of IL-4 (IC50 values of 7.0, 6.7 µM, respectively), IL-4 mRNA expression (IC50 values of 16.5, 7.2 µM, respectively) and IL-4 protein expression (IC50 values of 17.0, 9.6 µM, respectively) in antigen-induced IgE-sensitized RBL-2H3 cells. These results suggested that (−)-elema-1,3,11(13)-trien-12-ol (1) and thujopsene (2) effectively inhibits mast cell degranulation as well as IL-4 production, suggesting that these compounds from Thujopsis dolabrata can be used as candidates for IgE-mediated allergic disorders.

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