水母雪莲内生真菌Aspergillus sp. TPXq 的次级代谢产物研究

目的 研究藏药水母雪莲内生真菌Aspergillus sp. TPXq的次级代谢产物。方法 菌种采用震荡培养箱扩大培养，经反复硅胶柱色谱、Sephadex LH-20凝胶柱色谱、开放ODS柱色谱、高效液相色谱等方法进行分离纯化；并根据化合物的理化性质及波谱数据鉴定结构。结果 从来自藏药水母雪莲的一株内生真菌Aspergillus sp. TPXq的培养液中分离得到8个环二肽和1个生物碱类化合物。分别鉴定为3-异丁基-吡咯并哌嗪-2，5-二酮（Ⅰ）、3-异戊基-吡咯并哌嗪-2，5-二酮（Ⅱ）、3-仲丁基-吡咯并哌嗪-2，5-二酮（Ⅲ）、3-苄基-吡咯并哌嗪-2，5-二酮（Ⅳ）、3-苄基-6-对羟基苄基-2，5二酮（Ⅴ）、3，6-二甲基哌嗪-2，5-二酮（Ⅵ）、3-异丁基-6-异丙基哌嗪-2，5-二酮（Ⅶ）、3-异丁基-6-苄基哌嗪-2，5-二酮（Ⅷ）、Chaetominine（Ⅸ）。结论 其中化合物Ⅳ~Ⅷ为曲霉属Aspergillus.sp真菌中首次分离得到。细胞毒测试结果表明，以上化合物Ⅰ~Ⅷ对于A549和MCF-7肿瘤细胞均显示弱细胞毒活性（>50μg/mL），化合物Ⅸ对A549和MCF-7肿瘤细胞均具有显著的细胞毒活性，IC₅₀值分别为0.18μg/mL和0.89μg/mL。 

Secondary Metabolites from the Endophyte Fungus Aspergillus sp.Tpxq

OBJECTIVE To study the secondary metabolites of an endophytic fungus Aspergillus sp. TPXq isolated from Saussurea medusa. METHODS The strain was cultured in a large-scale by using the shaking incubator. The secondary metabolites were isolated by chromatography methods such as silica gel， Sephadex LH-20 columns， ODS flash column and HPLC， etc. The structures of these compounds were identified by their physico-chemical constants and the NMR data. RESULTS Eight Cyclodipeptides and one alkaloidwere seperated from secondary metabolites of an endophytic fungus Aspergillus sp. TPXq isolated were from Saussurea medusa.， and their stuctures were identified as 3-isobutylpyrrolopiperazine-2，5-dione (Ⅰ)，3-isopropyl-pyrrolopiperazine-2，5-dione (Ⅱ)， 3-seco-butyl-pyrrolopiperazine-2，5-dione (Ⅲ)， 3-benzyl-pyrrolopiperazine-2，5-dione (Ⅳ)， 3-benzyl-6-(p-hydroxy benzyl)piperazine-2，5-dione (Ⅴ)， 3，6-dimethylpiperazine-2，5-dione (Ⅵ)， 3-isobutyl-6-isopropylpiperazine-2，5-dione (Ⅶ)， 3-isobutyl-6-benzylpiperazine-2，5-dione (Ⅷ)， Chaetominine (Ⅸ)， by analysis of physiochemical and NMR data. CONCLUSION Among them， compounds Ⅳ~Ⅷ were isolated from Alterraria.sp for the first time. Compounds Ⅸ showed significant cytotoxic activity against A549 and MCF-7 tumor cells， the IC₅₀ values are 0.18μg/mL and 0.89μg/mL， respectively. However， compoundsⅠ~Ⅷ exhibited very weak cytotoxicity (>50μg/mL) against these cell lines.