title: Silymarin Inhibits Morphological Changes in LPS-Stimulated Macrophages by Blocking NF-κB Pathway.
abstract: The present study showed that silymarin, a polyphenolic flavonoid isolated from milk thistle (Silybum marianum), inhibited lipopolysaccharide (LPS)-induced morphological changes in the mouse RAW264.7 macrophage cell line. We also showed that silymarin inhibited the nuclear translocation and transactivation activities of nuclear factor-kappa B (NF-κB), which is important for macrophage activation-associated changes in cell morphology and gene expression of inflammatory cytokines. BAY-11-7085, an NF-κB inhibitor, abrogated LPS-induced morphological changes and NO production, similar to silymarin. Treatment of RAW264.7 cells with silymarin also inhibited LPS-stimulated activation of mitogen-activated protein kinases (MAPKs). Collectively, these experiments demonstrated that silymarin inhibited LPS-induced morphological changes in the RAW264.7 mouse macrophage cell line. Our findings indicated that the most likely mechanism underlying this biological effect involved inhibition of the MAPK pathway and NF-κB activity. Inhibition of these activities by silymarin is a potentially useful strategy for the treatment of inflammation because of the critical roles played by MAPK and NF-κB in mediating inflammatory responses in macrophages.
authors.affiliation: Department of Pharmacology, School of Medicine, Chosun University, Gwangju 501-759, Korea.
authors.forename: Eun Jeong
authors.initials: EJ
authors.lastname: Kim
authors.affiliation: Department of Pharmacology, School of Medicine, Chosun University, Gwangju 501-759, Korea.
authors.forename: Min Young
authors.initials: MY
authors.lastname: Lee
authors.affiliation: Department of Pharmacology, School of Medicine, Chosun University, Gwangju 501-759, Korea.
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Jeon
keywords: MAPK; Macrophages; NF-κB; iNOS