Archives of Pharmacal Research

The Pharmaceutical Society of Korea (대한약학회)
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Inhibitors of Inducible Nitric Oxide Synthase Expression from Artemisia iwayomogi

  • Ahn, Hanna (College of Pharmacy, Sookmyung Womens University) ;
  • Kim, Ji-Yeon (College of Pharmacy, Sookmyung Womens University) ;
  • Lee, Hwa-Jin (College of Pharmacy, Sookmyung Womens University) ;
  • Kim, Yong-Kyun (College of Forest Science, Kookmin University) ;
  • Ryu, Jae-Ha (College of Pharmacy, Sookmyung Womens University)
  • Published : 2003.04.01
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Abstract

Nitric oxide (NO) is an important bioactive agent that mediates a wide variety of physiological and pathophysiological events. NO overproduction by inducible nitric oxide synthase (iNOS) results in severe hypotension and inflammation. This investigation is part of a study to discover new iNOS inhibitors from medicinal plants using a macrophage cell culture system. Two sesquiterpenes (1 and 2) were isolated from Artemisia iwayomogi (Compositae) and were found to inhibit NO synthesis ($IC_{50} 3.64 \mu g/mL and 2.81 \mu$g/mL, respectively) in lipopolysaccharide (LPS)-activated RAW 264.7 cells. Their structures were identified as 3-Ο-methyl-iso-secotanapartholide (1) and iso-secotanapartholide (2). Compounds 1 and 2 inhibited the LPS-induced expression of the iNOS enzyme in the RAW 264.7 cells. The inhibition of NO production via the down regulation of iNOS expression may substantially modulate the inflammatory responses.

Keywords

References

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