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. 2018 Mar 25;284:101-111.
doi: 10.1016/j.cbi.2018.02.022. Epub 2018 Feb 20.

Kaempferol 7-O-β-D-glucoside Isolated From the Leaves of Cudrania Tricuspidata Inhibits LPS-induced Expression of Pro-Inflammatory Mediators Through Inactivation of NF-κB, AP-1, and JAK-STAT in RAW 264.7 Macrophages

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Kaempferol 7-O-β-D-glucoside Isolated From the Leaves of Cudrania Tricuspidata Inhibits LPS-induced Expression of Pro-Inflammatory Mediators Through Inactivation of NF-κB, AP-1, and JAK-STAT in RAW 264.7 Macrophages

Seung-Bin Lee et al. Chem Biol Interact. .

Abstract

Kaempferol 7-O-β-D-glucoside (KPG), a natural flavonol isolated from Cudrania tricuspidata, has been reported to exert anti-cancer effects; however, its anti-inflammatory effects have not yet been reported. In this study, we demonstrate the suppressive effect of KPG on the production of nitric oxide (NO), prostaglandin E2 (PGE2), tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-6) in lipopolysaccharide (LPS)-induced RAW 264.7 macrophages and mouse bone marrow-derived macrophages. KPG downregulated the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) at the protein level and iNOS, COX-2, TNF-α, IL-1β, and IL-6 at the mRNA level in LPS-treated RAW 264.7 macrophages. Moreover, we elucidated the underlying molecular mechanism, demonstrating that KPG attenuated LPS-induced nuclear factor-κB (NF-κB) activation by decreasing p65 nuclear translocation, inhibiting κBα (IκBα) phosphorylation/degradation and IκB kinaseα/β (IKKα/β) phosphorylation. KPG additionally reduced LPS-induced activator protein-1 (AP-1) activity by inhibiting c-Fos expression in the nucleus, though c-Jun was not affected. Furthermore, we revealed that KPG significantly abrogated the LPS-induced phosphorylation of signal transducer and activator of transcription (STAT) 1 (Ser 727, Tyr 701) and STAT3 (Tyr 705) through inhibiting the phosphorylation of Janus kinase (JAK) 1 and JAK2, its upstream activating proteins. Taken together, our data suggest that KPG induces anti-inflammatory activity by blocking NF-κB, AP-1, and JAK-STAT signaling pathways in LPS-treated RAW 264.7 macrophages, thus suppressing inflammatory mediators.

Keywords: AP-1; JAK-STAT; Kaempferol 7-O-β-D-glucoside; NF-κB; RAW 264.7 macrophages.

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