Synthesis of novel diosgenyl saponin analogues and apoptosis-inducing activity on A549 human lung adenocarcinoma
作者:Bo Wang、Jaemoo Chun、Yang Liu、Lina Han、Yan-shi Wang、Eun-Ji Joo、Yeong-Shik Kim、Mao-sheng Cheng
DOI:10.1039/c2ob26579f
日期:——
We synthesized a diosgenyl saponin bearing a unique disaccharide from the natural product β-hederin, together with twelve glycosylated derivatives and determined their cytotoxicity against five different human cancer cell lines. Most of them showed weak cytotoxicity, with the exception of compound 20, diosgenyl α-L-rhamnopyranosyl-(1→2)-[α-L-arabinopyranosyl-(1→4)]-α-L-arabinopyranoside, which exhibited strong cytotoxicity against A549 cells. The cytotoxicity of 20 was associated with apoptotic cell death, which was characterized by morphological changes, chromatin condensation, DNA fragmentation, and phosphatidylserine externalization. Compound 20 induced apoptosis of A549 cells through a caspase-8-mediated extrinsic pathway and a caspase-9-mediated intrinsic pathway. In addition, phosphorylation of JNK increased but the phosphorylation of ERK decreased after treatment with 20. These results provide a basic mechanism for the anticancer activity of 20.
我们合成了一种独特的含有二糖结构的地奥配基皂苷,源自天然产物β-常春藤素,并制备了十二种糖基化衍生物,测定了它们对五种不同的人类癌细胞系的细胞毒性。大多数衍生物显示出较弱的细胞毒性,例外的是化合物20,即地奥配基α-L-鼠李糖吡喃糖基-(1→2)-[α-L-阿拉伯糖吡喃糖基-(1→4)]-α-L-阿拉伯糖吡喃糖苷,对A549细胞表现出强烈的细胞毒性。化合物20的细胞毒性与其诱导的细胞凋亡有关,其特征包括形态学改变、染色质凝集、DNA断裂和磷脂酰丝氨酸外翻。化合物20通过caspase-8介导的外源途径和caspase-9介导的内源途径诱导A549细胞凋亡。此外,经化合物20处理后,JNK的磷酸化水平升高,而ERK的磷酸化水平降低。这些结果为化合物20的抗癌活性提供了基本机制。