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KMID : 0620720060120020113
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Natural Product Sciences
2006 Volume.12 No. 2 p.113 ~ p.117
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Quercitrin Gallate Down-regulates Interleukin-6 Expression by Inhibiting Nuclear Factor-kB Activation in Lipopolysaccharide-stimulated Macrophages
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Min Kyung-Rak
Kim Byung-Hak
Chang Yoon-Sook
Kim Young-Soo
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Abstract
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Quercitrin gallate was previously isolated from Persicaria lapathifolia (Polygonaceae) as an inhibitor of superoxide production. In the present study, quercitrin gallate was found to inhibit interleukin (IL)-6 production in lipopolysaccharide (LPS)-stimulated macrophages RAW 264.7 with an IC50 value of 63μM. Furthermore, quercitrin gallate attenuated LPS-induced synthesis of IL-6 transcript but also inhibited LPS-induced IL-6 promoter activity, indicating that the compound could down-regulate IL-6 expression at the transcription level. Since nuclear factor (NF)-kB has been shown to play a key role in LPS-inducible IL-6 expression, an effect of quercitrin gallate on LPS-induced NF-kB activation was further analyzed. Quercitrin gallate exhibited a dosedependent inhibitory effect on LPS-induced nuclear translocation of NF-kB without affecting inhibitory kB (IkB) degradation, and subsequently inhibited LPS-induced NF-kB transcriptional activity in macrophages RAW 264.7. Taken together, quercitrin gallate down-regulated LPS-induced IL-6 expression by inhibiting NF-kB activation, which could provide a pharmacological potential of the compound in IL-6-related immune and inflammatory diseases.
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KEYWORD
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Quercitrin gallate, IL-6 expression, NF-kB activation, macrophages RAW 264.7
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