Regulation of proinflammatory mediators via NF-κB and p38 MAPK-dependent mechanisms in RAW 264.7 macrophages by polyphenol components isolated from Korea Lonicera japonica THUNB

Abstract

Lonicera japonica THUNB., which abundantly contains polyphenols, has been used as a traditional medicine for thousands of years in East Asian countries because of the anti-inflammation properties. This study aimed to investigate the anti-inflammatory mechanism of polyphenol components isolated from Korea L. japonica T. by nuclear factor-kappaB (NF-B) and mitogen-activated protein kinases (MAPKs) pathway. Polyphenols significantly decreased lipopolysaccharide- (LPS-) induced mRNA and protein expression of inducible nitric oxide synthase and cyclooxygenase-2, as well as mRNA expression of tumor necrosis factor-alpha, interleukin- (IL-) 1, and IL-6. Moreover, polyphenols inhibited nuclear translocation of NF-B p65, phosphorylation/degradation of the inhibitor of B, and phosphorylation of p38 MAPK, whereas the extracellular signal-regulated kinase and Janus N-terminal kinase were not affected. These results indicate that polyphenol components isolated from Korea L. japonica T. should have anti-inflammatory effect on LPS-stimulated RAW 264.7 cells through the decrease of proinflammatory mediators expression by suppressing NF-B and p38 MAPK activity. Copyright © 2012 Kwang-Il Park et al.