作者:Eva Vavříková、Jan Vacek、Kateřina Valentová、Petr Marhol、Jitka Ulrichová、Marek Kuzma、Vladimír Křen
DOI:10.3390/molecules19044115
日期:——
Divalent or multivalent molecules often show enhanced biological activity relative to the simple monomeric units. Here we present enzymatically and chemically prepared dimers of the flavonolignans silybin and 2,3-dehydrosilybin. Their electrochemical behavior was studied by in situ and ex situ square wave voltammetry. The oxidation of monomers and dimers was similar, but adsorption onto the electrode and cell surfaces was different. A 1,1-diphenyl-2-picrylhydrazyl (DPPH) and an inhibition of microsomal lipoperoxidation assay were performed with same trend of results for silybin and 2,3-dehydrosilybin dimers. Silybin dimer showed better activity than the monomer, while on the contrary 2,3-dehydrosilybin dimer presented weaker antioxidant/antilipoperoxidant activity than its monomer. Cytotoxicity was evaluated on human umbilical vein endothelial cells, normal human adult keratinocytes, mouse fibroblasts (BALB/c 3T3) and human liver hepatocellular carcinoma cell line (HepG2). Silybin dimer was more cytotoxic than the parent compound and in the case of 2,3-dehydrosilybin its dimer showed weaker cytotoxicity than the monomer.
二价或多价分子通常相对于简单的单体单位表现出增强的生物活性。本文介绍了通过酶促和化学方法制备的黄酮木酚类化合物silybin和2,3-脱氢silybin的二聚体。通过原位和外位方波伏安法研究了它们的电化学行为。单体和二聚体的氧化过程相似,但在电极和细胞表面的吸附情况则有所不同。对1,1-二苯基-2-吡喃肼(DPPH)及微粒体脂质过氧化抑制测定的实验显示,silybin和2,3-脱氢silybin的二聚体结果趋势相同。silybin二聚体的活性优于其单体,而相反,2,3-脱氢silybin的二聚体表现出比其单体更弱的抗氧化/抗脂质过氧化活性。对人脐静脉内皮细胞、正常人成人角质形成细胞、小鼠成纤维细胞(BALB/c 3T3)和人肝细胞癌细胞系(HepG2)的细胞毒性进行了评估。结果显示,silybin二聚体的细胞毒性高于母体化合物,而在2,3-脱氢silybin的情况下,其二聚体的细胞毒性弱于单体。