Niaziminin, a Thiocarbamate from the Leaves of<i>Moringa oleifera</i>, Holds a Strict Structural Requirement for Inhibition of Tumor-Promoter-Induced Epstein-Barr Virus Activation
作者:Akira Murakami、Yumi Kitazono、Suratwadee Jiwajinda、Koichi Koshimizu、Hajime Ohigashi
DOI:10.1055/s-2006-957442
日期:1998.5
Three known thiocarbamate (TC)- and isothiocyanate (ITC)-related compounds have been isolated from the leaves of Moringa oleifera, a traditional herb in southeast Asia, as inhibitors of tumor promoter teleocidin B-4-induced Epstein-Barr virus (EBV) activation in Raji cells. Interestingly, only niaziminin among 10 TCs including 8 synthetic ones showed considerable inhibition against EBV activation. The structure-activity relationships indicated that the presence of an acetoxy group at the 4′-position of niaziminin is important and indispensable for inhibition. On the other hand, among the ITC-related compounds, naturally occurring 4-[(4′-O-acetyl-α-L-rhamnosyloxy)benzyl]ITC and commercially available allyl- and benzyl-ITC significantly inhibited activation, suggesting that the isothiocyano group is a critical structural factor for activity.
从东南亚传统草药辣木的叶子中分离出三种已知的硫代氨基甲酸盐(TC)和异硫氰酸盐(ITC)相关化合物,它们被鉴定为肿瘤促进剂大田软海绵素B-4诱导的Raji细胞中的爱泼斯坦-巴尔病毒(EBV)激活的抑制剂。有趣的是,在包括8种合成化合物在内的10种TC中,只有niaziminin表现出对EBV激活的显著抑制作用。结构-活性关系研究表明,niaziminin在4′-位置上的乙酰氧基对于抑制作用至关重要且不可或缺。另一方面,在ITC相关化合物中,天然存在的4-[(4′-O-乙酰基-α-L-鼠李糖基氧)苄基]ITC以及市售的烯丙基-和苄基-ITC均显著抑制激活,表明异硫氰酸根基团是活性中的关键结构因素。