AbstractBioassay-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-κB activity, which may exert a role in their anti-inflammatory activity.
摘要:通过
生物测定引导法分离出大戟科植物甘遂根的
乙醇提取物中的两种新的英格南二
萜类化合物,分别为euphorkans A (1)和B (2),以及16个已知类似物(3-18)。它们的结构由联合光谱和
化学方法确定。所有分离物都被评估其对RAW264.7巨噬细胞中脂
多糖诱导的
一氧化氮产生的抑制作用。化合物1-6和10-13表现出明显的抑制活性,IC50值在2.78-10.6µM之间,并且比阳性对照物
芦丁(IC50=15.8µM)更有效。化合物1和5被选用进行进一步的对TNF-α和IL-6这两种关键炎症介质的检测,并显示出明显的剂量依赖性抑制作用。初步的机制研究表明,化合物1和5抑制了NF-κB的活性,这可能在它们的抗炎活性中发挥了作用。