Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Inhibitory Effects of β-Glycyrrhetinic Acid on Tumor Necrosis Factor-α Production in RAW 264.7 Cells

  • Park, Kyoung-Sik (Nutrition & Functional Food Research Team, Korea Food & Drug Administration)
  • Received : 2010.04.07
  • Accepted : 2010.06.07
  • Published : 2010.09.30
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Abstract

$\beta$-glycyrrhetinic acid (GA), the active principle of licorice (Glycyrrhiza glabra L.) has been reported to exhibit anti-inflammatory properties in different animal models. In this study, the effects of GA on the production of inflammatory mediators including tumor necrosis factor (TNF)-$\alpha$, interleukin (IL)-6, nitric oxide (NO), and prostaglandin E (pGE)-2 were examined in RAW 264.7 cells in vitro. Furthermore, to elucidate a possible mechanism for the inhibitory effect of GA on the production of TNF-$\alpha$, it was investigated whether the treatment of GA affects the I-${\kappa}B{\alpha}$ degradation and subsequent nuclear translocation of NF-${\kappa}B$. Various inflammatory responses were induced in the culture system by treating with a lipopolysaccharide (LPS). GA showed anti-inflammatory activities in dose-dependant manner with $IC_{50}$ of $5.4{\mu}M$ by inhibiting the production of TNF-$\alpha$ in RAW 264.7 cells. In addition, the treatment of GA blocked both I-${\kappa}B{\alpha}$ degradation and the nuclear translocation of NF-${\kappa}B$ from cytosol to nucleus. However, it did not affect the production of IL-6, NO, and PGE-2, implying the direct blocking of the production of TNF-$\alpha$ resulting from both the I-${\kappa}B{\alpha}$ degradation and the nuclear translocation of NF-${\kappa}B$. This finding might provide the underlying mechanism to explain the reported anti-inflammatory activities of GA in animal models.

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References

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