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Anti-inflammatory Ingenane Diterpenoids from the Roots of Euphorbia kansui.
Planta Medica 2018 December
Bioassay-guided fractionation of the ethanolic extract of the roots of Euphorbia kansui led to the isolation of two new ingenane diterpenoids, euphorkans A (1: ) and B (2: ), together with 16 known analogues (3: - 18: ). Their structures were determined by combined spectral and chemical methods. All the isolates were evaluated for their inhibitory effects on lipopolysaccharide-induced nitric oxide production in RAW264.7 macrophage cells. Compounds 1: - 6: and 10: - 13: exhibited pronounced inhibitory activity with IC50 values in the range of 2.78 - 10.6 µM, and were more potent than the positive control, quercetin (IC50 = 15.8 µM). Compounds 1: and 5: were selected for further assays toward the key inflammation mediators TNF- α and IL-6, and showed a significant inhibition in a dose-dependent manner. The preliminary mechanistic study revealed that 1: and 5: inhibited NF- κ B activity, which may exert a role in their anti-inflammatory activity.
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