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Anti-inflammatory activities of triterpenoid saponins from Polygala japonica

by: H. Wang, J. Gao, J. Kou, D. Zhu, B. Yu
Phytomedicine, Vol. 15, No. 5. (May 2008), pp. 321-326, doi:10.1016/j.phymed.2007.09.014  Key: citeulike:11402492

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Abstract

Bioassay-guided investigation was performed to identify the active constituents from a methanol extract of Polygala japonica, a folk medicinal plant widely used in China to treat inflammatory diseases. The n-BuOH and EtOAc fractions of the P. japonica methanol extract, which show significant anti-inflammatory activity in in vivo test, were further subjected to column chromatography to afford six triterpene glycosides, marked here as saponins 1–6. All compounds were evaluated for their anti-inflammatory activity in the carageenan-induced mouse paw edema test, and saponins 1, 4 and 5 showed significantly anti-inflammatory effects on both phases of carageenan-induced acute paw edema in mice. Saponin 5 was also found to significantly inhibit the production of inflammatory mediators – nitric oxide (NO) in LPS-stimulated RAW264.7 macrophages, with no obvious effects on macrophage viability.


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