Columbianadin suppresses lipopolysaccharide (LPS)-induced inflammation and apoptosis through the NOD1 pathway

Columbianadin (CBN) is one of the main bioactive constituents isolated from the root of Angelica pubescens. Although the anti-inflammatory activity of CBN has been reported, the underpinning mechanism of this remains unclear. In this study, we investigated the anti-inflammatory effect of CBN on lipopolysaccharide (LPS)-stimulated THP-1 cells and explored the possible underlying molecular mechanisms. The results showed that CBN suppressed LPS-mediated inflammatory response mainly through the inactivation of the NOD1 and NF- B p65 signaling pathways. Knockdown of NOD1 reduced the degree to which inflammatory cytokines decreased following CBN treatment, whereas forced expression of NOD1 and CBN treatment reduced NF- Bp65 activation and the secretion of inflammatory cytokines. Furthermore, CBN significantly reduced cellular apoptosis by inhibiting the NOD1 pathway. Collectively, our results indicate that CBN suppressed the LPS-mediated inflammatory response by inhibiting NOD1/NF- B activation. Furtherinvestigations are required to determine the mechanisms of action of CBN in the inhibition of NOD signaling: However, CBN may be employed as a therapeutic agent for multiple inflammatory diseases.