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Fluorescence in vivo imaging of live tumor cells with pH-activatable targeted probes via receptor-mediated endocytosis

机译:通过受体介导的内吞作用用pH激活的靶向探针对活体肿瘤细胞进行荧光体内成像

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One goal of molecular imaging is to establish a widely applicable technique for specific detection of tumors with minimal background. Here, we achieve specific in vivo tumor visualization with a newly-designed "activatable" targeted fluorescence probe. This agent is activated after cellular internalization by sensing the pH change in the lysosome. Novel acidic pH-activatable probes based on the BODIPY fluorophore were synthesized, and then conjugated to a cancer-targeting monoclonal antibody, Trastuzumab, or galactosyl serum albumin (GSA). As proof of concept, ex and in vivo imaging of two different tumor mouse models was performed: HER2-overexpressed lung metastasis tumor with Trastuzumab-pH probe conjugates and lectin-overexpressed i.p. disseminated tumor with GSA-pH probe conjugates. These pH-activatable targeted probes were highly specific for tumors with minimal background signal. Because the acidic pH in lysosomes is maintained by the energy-consuming proton pump, only viable cancer cells were successfully visualized. Furthermore, this strategy was also applied to fluorescence endoscopy in tumor mouse models, resulting in specific visualization of tumors as small as submillimeter in size that could hardly detected by naked eyes because of their poor contrast against normal tissues. The design concept can be widely adapted to cancer-specific cell-surface-targeting molecules that result in cellular internalization.
机译:分子成像的一个目标是建立一种可广泛应用的技术,以最小的背景特异性检测肿瘤。在这里,我们使用新设计的“可激活”靶向荧光探针实现了特定的体内肿瘤可视化。细胞内在化后,通过检测溶酶体的pH变化来激活该试剂。合成了基于B​​ODIPY荧光团的新型酸性pH可激活探针,然后将其与靶向癌症的单克隆抗体曲妥珠单抗或半乳糖基血清白蛋白(GSA)偶联。作为概念验证,对两种不同的肿瘤小鼠模型进行了体外和体内成像:带有曲妥珠单抗-pH探针结合物的HER2过表达的肺转移肿瘤和凝集素过表达的i.p. GSA-pH探针结合物扩散的肿瘤。这些可通过pH激活的靶向探针对肿瘤具有高度特异性,背景信号极少。因为通过耗能的质子泵维持了溶酶体中的酸性pH,所以只能成功地观察到活的癌细胞。此外,该策略还应用于肿瘤小鼠模型中的荧光内窥镜检查,可特异性观察小至亚毫米大小的肿瘤,由于与正常组织的对比差,肉眼几乎无法检测到。该设计概念可广泛适用于导致细胞内化的特定于癌症的细胞表面靶向分子。

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