Preparation and characterization of phospholipid-conjugated indocyanine green as a near-infrared probe
作者:Akiko Suganami、Taro Toyota、Shigetoshi Okazaki、Kengo Saito、Katsuhiko Miyamoto、Yasunori Akutsu、Hiroshi Kawahira、Akira Aoki、Yutaka Muraki、Tomoyuki Madono、Hideki Hayashi、Hisahiro Matsubara、Takashige Omatsu、Hiroshi Shirasawa、Yutaka Tamura
DOI:10.1016/j.bmcl.2012.10.044
日期:2012.12
We have rationally designed and synthesized a novel near-infrared (NIR) photoactivating probe, designated by iDOPE, in which an indocyanine green (ICG) fluorophore is covalently conjugated with a phospholipid moiety, 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE), to incorporate into liposome bilayers. NIR irradiation showed that iDOPE retained the optical and fluorescence properties of ICG and demonstrated photoactivator characteristics: fluorescence emission at around 820 nm in a solvent, singlet oxygen production, and concentration-dependent heat generation. Additionally, iDOPE was incorporated into liposome bilayers and maintained stable liposomally formulated iDOPE (LP-iDOPE) over 1 week under physiological conditions. We also observed the tumor-specific biodistribution of LP-iDOPE of in vivo xenografts. These findings suggest that LP-iDOPE might be a promising tool for NIR optical imaging, photodynamic therapy, and photothermal therapy. (C) 2012 Elsevier Ltd. All rights reserved.