半边旗5种成分体外细胞毒活性比较及构效关系分析

用多种人癌细胞株以MTT试验,体外筛选半边旗抗肿瘤活性成分。结果显示:化合物5F,6F,A及半边旗乙醇提取物PSE对5种人癌细胞均有不同程度的杀伤作用,且呈明显的剂量依赖关系。其中6F的活性最强,其次是A,5F,而化合物4F和B对5种细胞均无细胞毒活性。分析它们的构效关系可以推测,α-β-亚甲基环戊酮结构是其活性部位,结构中羟基数目和位置的不同可以影响化合物的活性强度。

COMPARISON OF THE CYTOTOXICITY OF FIVE CONSTITUENTS FROM PTERIS SEMIPINNATA L. IN VITRO AND THE ANALYSIS OF THEIR STRUCTURE-ACTIVITY RELATIONSHIPS

The antitumor constituents were isolated from Pteris semipinnata L. (PsL), a Chinese traditional herb, and screened using tetrazolium salt (MTT) method. Their cytotoxic effects in vitro on several human tumor cell lines were studied. Compounds 5F, 6F, A and the ethanolic extract of PsL (PSE) were shown to have strong cytotoxicity against five cell lines: human liver adenocarcinoma cell line (HePG II), human lung adenocarcinom a cell line (SPC-A-1), human gastric adenocarcinoma cell line (MGC-803), human nasopharyngeal carcinoma cells in low differentiation (CNE-2Z) and human liver adenocarcinoma cell line (BEL-7402) in different degrees in a dose-dependent manner; compound 6F was the most active one, whose IC50 after 72 h treatment for the above five cell lines were 0.343 +/- 0.003, 0.115 +/- 0.022, 0.590 +/- 0.032, 0.328 +/- 0.066 and 0.221 +/- 0.058 microgram.ml-1, respectively. Compounds A and 5F were less active; no cytotoxicity of compounds 4F and B were detected on the five cell lines. Analysis of the relationship between structure and activity revealed that the antitumor activity portion in the structure is the alpha, beta-methylene cyclopentanone moiety, and the site and number of the hydroxy groups affect the cytotoxicity of these agents significantly.