Molecular Imaging Program at Stanford (MIPS), Bio-X Program, and Department of Radiology, Canary Center at Stanford for Cancer Early Detection , Stanford University , Stanford , California , 94305-5344 , United States.
Department of Clinical Physiology, Nuclear Medicine & PET and Cluster for Molecular Imaging, Department of Biomedical Sciences , Rigshospitalet and University of Copenhagen , 2200 Copenhagen N, Denmark.
Bioconjug Chem. 2018 Nov 21;29(11):3833-3840. doi: 10.1021/acs.bioconjchem.8b00669. Epub 2018 Oct 23.
Optical imaging strategies for improving delineation of glioblastoma (GBM) is highly desired for guiding surgeons to distinguish cancerous tissue from healthy and precious brain tissue. Fluorescence imaging (FLI) in the second near-infrared window (NIR-II) outperforms traditional NIR-I imaging with better tissue penetration, higher spatial and temporal resolution, and less auto fluorescence and scattering. Because of high expression in GBM and many other tumors, urokinase Plasminogen Activator Receptor (uPAR) is an attractive and well proven target for FLI. Herein we aim to combine the benefit of a NIR-II fluorophore with a high affinity uPAR targeting small peptide. A targeted NIR-II fluorescent probe was developed by conjugating an in-house synthesized NIR-II fluorophore, CH1055, and a uPAR targeting peptide, AE105. To characterize the in vivo distribution and targeting properties, a dynamic imaging was performed in orthotopic GBM bearing nude mice ( n = 8). Additionally, fluorescence guided surgery of orthotopic GBM was performed in living animals. CH1055-4Glu-AE105 was easily synthesized with >75% yield and >98% HPLC evaluated purity. The retention time of the probe on analytical HPLC was 15.9 min and the product was verified by mass spectrometry. Dynamic imaging demonstrated that the uPAR targeting probe visualized orthotopic GBM through the intact skull with a tumor-to-background ratio (TBR) of 2.7 peaking at 96 h. Further, the orthotopic GBM was successfully resected in small animals guided by the NIR-II FLI. By using a small uPAR targeting NIR-II probe, FLI allows us to specifically image and detect GBM. A real-time imaging setup further renders FLI guided tumor resection, and the probe developed in this work is a promising candidate for clinical translation.
用于提高胶质母细胞瘤(GBM)边界勾画的光学成像策略,对于指导外科医生区分癌组织与健康和宝贵的脑组织非常重要。近红外二区(NIR-II)荧光成像是一种优于传统近红外一区(NIR-I)成像的方法,具有更好的组织穿透性、更高的时空分辨率以及更少的自体荧光和散射。由于在 GBM 和许多其他肿瘤中高表达,尿激酶型纤溶酶原激活物受体(uPAR)是荧光成像(FLI)的一个有吸引力且经过充分验证的靶点。在此,我们旨在将 NIR-II 荧光团的优势与高亲和力的 uPAR 靶向小肽结合起来。通过将我们自主合成的 NIR-II 荧光团 CH1055 与 uPAR 靶向肽 AE105 偶联,开发了一种靶向 NIR-II 荧光探针。为了表征其体内分布和靶向特性,在荷原位 GBM 的裸鼠(n=8)中进行了动态成像。此外,还在活体动物中进行了 NIR-II 荧光引导的原位 GBM 手术。CH1055-4Glu-AE105 很容易以 >75%的产率和 >98%的 HPLC 评估纯度合成。探针在分析 HPLC 上的保留时间为 15.9 分钟,产物通过质谱法验证。动态成像显示,该 uPAR 靶向探针通过完整的颅骨可视化了原位 GBM,肿瘤与背景的比值(TBR)在 96 小时时达到 2.7 的峰值。进一步,在 NIR-II FLI 的引导下,成功切除了小动物体内的原位 GBM。通过使用靶向 NIR-II 的小 uPAR 探针,FLI 使我们能够特异性地对 GBM 进行成像和检测。实时成像设置进一步实现了 FLI 引导的肿瘤切除,而本工作中开发的探针是临床转化的有前途的候选者。
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