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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的pH激活靶向探针的活肿瘤细胞体内成像的荧光

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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广泛适用的技术,用于具体检测肿瘤,具有最小的背景。在这里,我们通过新设计的“可活化”靶向荧光探针实现体内肿瘤可视化的特异性。通过感测溶酶体中的pH变化,该试剂在细胞内化后激活。合成了基于B​​OBIPY荧光团的新型酸性pH-可活化探针,然后与癌症靶向单克隆抗体,曲妥珠单抗或半乳糖基血清白蛋白(GSA)缀合。作为概念证明,进行了两种不同肿瘤小鼠模型的前和体内成像:Her2-过表达肺转移肿瘤,具有曲妥珠猴-PH探针缀合物和凝集素 - 过度抑制的I.P。与GSA-pH探针缀合物的播散肿瘤。这些pH-活化的靶向探针对于具有最小背景信号的肿瘤非常具体。因为溶酶体中的酸性pH由能量消耗的质子泵维持,因此仅成功地可视化了活性癌细胞。此外,该策略还应用于肿瘤小鼠模型中的荧光内窥镜检查,导致肿瘤的特异性可视化,如肉眼少量的血管计,因为它们较差的对比对正常组织的较差而异。设计概念可广泛适应癌症特异性细胞表面靶向分子,导致细胞内化。

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