Sauchinone, a lignan from Saururus chinensis, suppresses iNOS expression through the inhibition of transactivation activity of RelA of NF-kappaB.

Anticancer Agents Research Laboratory, Korea Research Institute of Bioscience and Biotechnology, Yuseong, Daejeon, Korea.
Planta Medica (Impact Factor: 2.35). 01/2004; 69(12):1096-101. DOI: 10.1055/s-2003-45189
Source: PubMed

ABSTRACT Sauchinone, a known lignan, was isolated from the root of Saururus chinensis as an active principle responsible for inhibiting the production of NO in LPS-stimulated RAW264.7 cells by activity-guided fractionation. Sauchinone dose-dependently inhibited not only the production of NO, but also the expression of iNOS mRNA and protein in LPS-stimulated RAW 264.7 cells. Furthermore, sauchinone prevented LPS-induced NF-kappaB activation, which is known to play a critical role in iNOS expression, assessed by a reporter assay under the control of NF-kappaB. However, an electrophoretic mobility shift assay (EMSA) demonstrated that sauchinone did not suppress the DNA-binding activity of NF-kappaB or the degradation of IkappaB-alpha induced by LPS. Further analysis revealed that transactivation activity of RelA subunit of NF-kappaB was dose-dependently suppressed in the presence of sauchinone. Taken together, our results suggested that sauchinone could inhibit production of NO in LPS-stimulated RAW264.7 cells through the suppression of NF-kappaB by inhibiting transactivation activity of RelA subunit.

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