Development of Novel Nanocarrier-Based Near-Infrared Optical Probes for In Vivo Tumor Imaging
作者:Yoichi Shimizu、Takashi Temma、Isao Hara、Ryo Yamahara、Ei-ichi Ozeki、Masahiro Ono、Hideo Saji
DOI:10.1007/s10895-011-1007-z
日期:2012.3
Optical imaging with near-infrared (NIR) fluorescent probes is a useful diagnostic technology for in vivo tumor detection. Our plan was to develop novel NIR fluorophore-micelle complex probes. IC7-1 and IC7-2 were synthesized as novel lipophilic NIR fluorophores, which were encapsulated in an amphiphilic polydepsipeptide micelle “lactosome”. The fluorophore-micelle complexes IC7-1 lactosome and IC7-2 lactosome were evaluated as NIR fluorescent probes for in vivo tumor imaging. IC7-1 and IC7-2 were synthesized and then encapsulated in lactosomes. The optical properties of IC7-1, IC7-2, IC7-1 lactosome and IC7-2 lactosome were measured. IC7-1 lactosome and IC7-2 lactosome were administered to tumor-bearing mice, and fluorescence images were acquired for 48 h. IC7-1 and IC7-2 were successfully synthesized in 12% and 6.3% overall yield, and maximum emission wavelengths in chloroform were observed at 858 nm and 897 nm, respectively. Aqueous buffered solutions of IC7-1 lactosome and IC7-2 lactosome showed similar fluorescence spectra in chloroform and higher or comparable quantum yields and higher photostability compared with ICG. Both lactosome probes specifically visualized tumor tissue 6 h post-administration. IC7-1 lactosome and IC7-2 lactosome could be promising NIR probes for in vivo tumor imaging.
近红外(NIR)荧光探针的光学成像是一种用于体内肿瘤检测的有用诊断技术。我们的计划是开发新型近红外荧光团-胶束复合探针。我们合成了 IC7-1 和 IC7-2,作为新型亲脂性近红外荧光团,并将其封装在两亲性聚表肽胶束 "乳糖体 "中。荧光团-胶束复合物 IC7-1 乳糖体和 IC7-2 乳糖体被评估为用于体内肿瘤成像的近红外荧光探针。IC7-1 和 IC7-2 经合成后封装在乳糖体中。测量了 IC7-1、IC7-2、IC7-1 乳糖体和 IC7-2 乳糖体的光学特性。给肿瘤小鼠注射IC7-1乳糖体和IC7-2乳糖体,48 h后采集荧光图像。IC7-1和IC7-2成功合成,总产率分别为12%和6.3%,在氯仿中的最大发射波长分别为858 nm和897 nm。与 ICG 相比,IC7-1 乳糖体和 IC7-2 乳糖体的缓冲水溶液在氯仿中显示出相似的荧光光谱、更高或相当的量子产率和更高的光稳定性。两种乳糖体探针都能在给药后 6 h 特异性地观察到肿瘤组织。IC7-1乳糖体和IC7-2乳糖体有望成为体内肿瘤成像的近红外探针。