A series of novel ligustrazine-oleanolic acid (TOA) derivatives were designed, and synthesized by conjugating amino acids to the 3-hydroxy group of TOA by ester bonds. Their cytotoxicity was evaluated on four cancer cell lines (HepG2, HT-29, Hela and BGC-823) by standard MTT assays. The ClogP values were calculated by means of computer simulation, and logP values of both 3β-glycine ester olean-12-en-28-oic acid-3,5,6-trimethylpyrazin-2-methyl ester (6a) and TOA were determined using a shake flask-ultraviolet spectrophotometry method. It was found that 6a and the 3β-L-lysine ester-6g not only displayed good cytotoxicity (IC50 < 3.5 μM) but also possessed better hydrophilicity than TOA. Moreover, 6a (IC50 = 4.884 μM) had lower nephrotoxicity than both 6g (IC50 = 2.310 μM) and cisplatin (CDDP, IC50 = 3.691 μM) on MDCK cells. Combining Giemsa and DAPI staining, it was further verified that 6a could induce HepG2 apoptosis via nuclei fragmentation and had lower nephrotoxicity. In addition, the structure-activity relationships of these derivatives are briefly discussed.
设计并合成了一系列新颖的
川芎嗪-
齐墩果酸(
TOA)衍
生物,通过酯化反应将
氨基酸连接到
TOA的3-羟基上。采用标准的M
TT法评估了这些衍
生物对四种癌
细胞系(HepG2、HT-29、Hela和BGC-823)的细胞毒性。通过计算机模拟计算了ClogP值,并使用摇瓶-紫外分光光度法测定了3β-甘
氨酸酯齐墩果-12-烯-28-酸-3,5,6-三甲基
吡嗪-2-甲酯(6a)和
TOA的logP值。发现6a和3β-
L-赖氨酸酯-6g不仅显示出良好的细胞毒性(IC50 < 3.5 μM),而且比TOA具有更好的亲水性。此外,6a(IC50 = 4.884 μM)在MDCK细胞上的肾毒性低于6g(IC50 = 2.310 μM)和顺铂(CDDP,IC50 = 3.691 μM)。结合Giemsa和DAPI染色,进一步验证了6a能通过核碎片诱导HepG2凋亡,并且具有较低的肾毒性。此外,还简要讨论了这些衍
生物的构效关系。