作者:Ning, Lili、Qu, Guiqin、Ye, Min、Guo, Hongzhu、Bi, Kaishun、Guo, Dean
DOI:10.1055/s-2003-43220
日期:2003.9
The diterpenoid triepoxides are the major active constituents of Tripterygium wilfordii with potent antitumor and immune activities. But the strong toxicity of these compounds has restricted their application to a great extent. In order to find more effective compounds with less toxicity, structural modifications of triptonide (1) by Aspergillus niger (AS 3.739) were investigated and four biotransformed products were obtained. Based on their chemical and spectral data, their structures were elucidated as 5α-hydroxytriptonide (2), triptolide (3), 17-hydroxytriptonide (4), and 16-hydroxytriptonide (5), among which 2, 4 and 5 are new compounds. All the three new transformed products showed cytotoxic activities against the majority of the human tumor cell lines tested, however, they are found to possess less cytotoxic activity when compared with 1. Both compounds 4 and 5 showed similar cytotoxic activity and their IC50 values were 5 - 15 fold less than 1, while 2 is about 100 times less active than 1.
二萜三氧化物是威灵仙的主要活性成分,具有强大的抗肿瘤和免疫活性。但这些化合物的强烈毒性在很大程度上限制了它们的应用。为了找到毒性更小的有效化合物,研究人员研究了黑曲霉(AS 3.739)对三肽化物(1)的结构改造,并获得了四种生物转化产物。根据其化学和光谱数据,它们的结构被阐明为 5δ-羟基雷公藤内酯(2)、雷公藤内酯(3)、17-羟基雷公藤内酯(4)和 16-羟基雷公藤内酯(5),其中 2、4 和 5 为新化合物。这三种新的转化产物对大多数受测的人类肿瘤细胞株都显示出细胞毒性活性,但与 1 相比,它们的细胞毒性活性较低。化合物 4 和 5 显示出相似的细胞毒性活性,其 IC50 值比 1 低 5-15 倍,而 2 的活性比 1 低约 100 倍。