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This study was conducted to demonstrate the inhibitory effect of saucerneol G (SG), a new lignan, isolated from the aerial part of Saururus chinensis (Saururaceae) on lipopolysaccharide (LPS)-stimulated matrix metalloproteinase-9 (MMP)-9 inductions in RAW 264.7 cells. Aimed at evaluating the mechanism of action by which SG inhibits the LPS-mediated induction of MMP-9, the effects of SG on nuclear factor-κB (NF-κB) DNA binding activity, NF-κB-dependent reporter gene activity, inhibitory factor-κB (IκB) phosphorylation, degradation and p65 nuclear translocation were assessed. SG profoundly suppressed the DNA binding activity and the reporter gene activity as well as translocation of NF-κB p65 subunit. Furthermore, SG also dose dependently inhibited LPS-stimulated activation of mitogen-activated protein kinases (MAPKs). These findings suggest that SG may inhibit LPS-stimulated MMP-9 induction by blocking NF-κB and MAPKs activation.

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Saucerneol G, a New Lignan, from Saururus chinensis Inhibits Matrix Metalloproteinase-9 Induction via a Nuclear Factor .KAPPA.B and Mitogen Activated Protein Kinases in Lipopolysaccharide-Stimulated RAW264.7 Cells