Synthesis of Chemical-Biology Tools Enabling in vivo Imaging and Analysis of Epigallocatechin Gallate
作者:Tomohiro Asakawa、Atsushi Yoshida、Yasuo Hirooka、Takashi Suzuki、Kunihiko Itoh、Kosuke Shimizu、Naoto Oku、Takumi Furuta、Toshiyuki Wakimoto、Makoto Inai、Toshiyuki Kan
DOI:10.3987/com-15-s(t)25
日期:——
(-)-Epigallocatechin gallate (EGCg) has multiple bioactivities, and imaging/analytical tools are required for drug development studies. Here we present full details of our synthetic studies aimed at providing building blocks for development of such tools, including a concise synthesis of model compound 5,7-dideoxyEGCg (DOEGCg, 2) and an asymmetric synthesis of 6-(5-aminopenty1)-5,7-deoxyepigallocatechin gallate (APDOEGCg, 4), which contains a reactive terminal amino group. To demonstrate its utility, APDOEGCg (4) was efficiently converted to a fluorescent probe 53 by linking it to a fluorescein derivative, Tokyo Green, via the amino group. We confirmed that 53 is suitable for in vivo imaging studies. We also prepared an immunogen 56 by conjugation of 4 to human serum albumin carrier protein via a glutaraldehyde linker, and we used 56 to raise anti-EGCg antiserum in mice. The fluorescent probe and antiserum should be useful tools for biochemical investigations of the localization and target sites of EGCg. APDOEGCg should also be available for developing other novel tools for biochemical studies of catechins.
(-)-表没食子儿茶素-3-没食子酸酯 (EGCg) 具有多种生物活性,研究药物开发需要成像/分析工具。在这里,我们介绍了旨在为开发此类工具提供构建块的合成研究的详细信息,包括模型化合物 5,7-二脱氧EGCg (DOEGCg, 2) 的简要合成以及 6-(5-氨基戊基)-5,7-二脱氧表没食子儿茶素-3-没食子酸酯 (APDOEGCg, 4) 的不对称合成,其中含有一个活性末端氨基基团。为了展示其用途,APDOEGCg (4) 通过将其与 fluorescein 衍生物东京绿色通过氨基连接,有效地转化为荧光探针 53。我们证实 53 适用于体内成像研究。我们还通过戊二醛连接剂将 4 与人血清白蛋白载体蛋白偶联,制备了免疫原 56,并用 56 在小鼠中制备了抗EGCg抗血清。荧光探针和抗血清应该是研究 EGCg 定位和靶点的生化研究有用工具。APDOEGCg 还可用于开发其他新型工具,用于研究儿茶素的生化研究。