title: Surfactin blocks NO production in lipopolysaccharide-activated macrophages by inhibiting NF-kappaB activation.
abstract: Surfactin is a natural biosurfactant derived from Bacillus subtilis and has various biological activities such as anticancer, antiplatelet, and anti-inflammatory effects. In this study, the inhibitory mechanism of surfactin in NO production from macrophages was examined. Surfactin downregulated LPSinduced NO production in RAW264.7 cells and primary macrophages with IC50 values of 31.6 and 22.4 microM, respectively. Immunoblotting analysis showed that surfactin strongly blocked the phosphorylation of IKK and IkBa and the nuclear translocation of NF-kappaB (p65). Therefore, these data suggest that surfactin may act as a bacterium-derived antiinflammatory agent with anti-NF-kappaB activity.
authors.affiliation: School of Bioscience and Biotechnology, and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon 200-701, Korea.
authors.forename: Se Eun
authors.initials: SE
authors.lastname: Byeon
authors.forename: Yong Gyu
authors.initials: YG
authors.lastname: Lee
authors.forename: Byung Hun
authors.initials: BH
authors.lastname: Kim
authors.forename: Ting
authors.initials: T
authors.lastname: Shen
authors.forename: Sang Yeol
authors.initials: SY
authors.lastname: Lee
authors.forename: Hwa Jin
authors.initials: HJ
authors.lastname: Park
authors.forename: Seung-Chun
authors.initials: SC
authors.lastname: Park
authors.forename: Man Hee
authors.initials: MH
authors.lastname: Rhee
authors.forename: Jae Youl
authors.initials: JY
authors.lastname: Cho
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001412:Bacillus subtilis / Q000378:metabolism; D002460:Cell Line; D016207:Cytokines / Q000037:antagonists & inhibitors / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D020128:Inhibitory Concentration 50; D055666:Lipopeptides / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D020935:MAP Kinase Signaling System / Q000187:drug effects; D008262:Macrophage Activation; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D016328:NF-kappa B / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II / Q000235:genetics / Q000378:metabolism; D010456:Peptides, Cyclic / Q000494:pharmacology*
chemical_list: D016207:Cytokines; D004791:Enzyme Inhibitors; D055666:Lipopeptides; D008070:Lipopolysaccharides; D016328:NF-kappa B; D010456:Peptides, Cyclic; C009365:surfactin peptide; D009569:Nitric Oxide; D052247:Nitric Oxide Synthase Type II