Abstract: Astragalus polysaccharides (APS), one of main bioactive components in Astragalus membranaceus Bunge, has been reported to possess anti-inflammatory activities, but the molecular mechanisms behind this activity are largely unknown. This study aimed to investigate expression of inflammatory cytokines and the MAPK/NF-κB pathway in human THP-1 macrophages induced by lipopolysaccharide (LPS). The results showed that the concentrations of TNF-a and IL-1β released from LPS stimulated THP-1 cells increased significantly compared to control (p < 0.01). After treatment with APS, the TNF-a and IL-1β levels were significantly lower than those in the LPS group (p < 0.05). The mRNA expression of TNF-a and IL-1β were also inhibited. Mechanistic studies indicated that APS strongly suppressed NF-κB activation and down-regulated the phosphorylation of ERK and JNK, which are important signaling pathways involved in the production of TNF-a and IL-1β, demonstrating that APS could suppress the production of TNF-a and IL-1β by LPS stimulated macrophages by inhibiting NF-κB activation and ERK and JNK phosphorylation.
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He, X.; Shu, J.; Xu, L.; Lu, C.; Lu, A. Inhibitory Effect of Astragalus Polysaccharides on Lipopolysaccharide-Induced TNF-a and IL-1β Production in THP-1 Cells. Molecules 2012, 17, 3155-3164.
He X, Shu J, Xu L, Lu C, Lu A. Inhibitory Effect of Astragalus Polysaccharides on Lipopolysaccharide-Induced TNF-a and IL-1β Production in THP-1 Cells. Molecules. 2012; 17(3):3155-3164.
He, Xiaojuan; Shu, Jun; Xu, Li; Lu, Cheng; Lu, Aiping. 2012. "Inhibitory Effect of Astragalus Polysaccharides on Lipopolysaccharide-Induced TNF-a and IL-1β Production in THP-1 Cells." Molecules 17, no. 3: 3155-3164.