脂肪酸转运蛋白CD36靶向近红外荧光探针的发现助力胶质瘤的可视化及影像引导手术

Discovery of Fatty Acid Translocase CD36-Targeting Near-Infrared Fluorescent Probe Enables Visualization and Imaging-Guided Surgery for Glioma.

作者信息

Tao Tianming, Li Gang, Zhou Kuncheng, Pan Qingshan, Wu Dong, Lai Luogen, Gao Minfang, Li Shuxin, Chen Lai, Han Ray P S, Luo Ping, Tu Yuanbiao

机构信息

Cancer Research Center, the Jiangxi Province Key Laboratory for Diagnosis, Treatment, and Rehabilitation of Cancer in Chinese Medicine, Discipline of Chinese and Western Integrative Medicine, Jiangxi Engineering Research Center for Translational Cancer Technology, Jiangxi University of Chinese Medicine, Nanchang 330004, China.

Key Laboratory of Nanchang City for Green New Materials and Industrial Wastewater Treatment, Department of Ecology and Environment, Yuzhang Normal University, Nanchang 330103, China.

出版信息

Anal Chem. 2025 Feb 18;97(6):3687-3695. doi: 10.1021/acs.analchem.4c06469. Epub 2025 Feb 4.

Abstract

Despite therapeutic advances in glioma, glioma-related mortality rates remain high due to its extremely poor prognosis and high recurrence. Near-infrared (NIR) fluorescence imaging technologies, using the clinically approved fluorescent probe 5-ALA, have gained prominence in facilitating visualization of glioma resection. However, the false-positive and false-negative results of 5-ALA decrease its sensitivity and specificity in detecting glioma, thereby hampering its use in glioma surgical navigation. Herein, a novel molecular probe MPA-Pip-abt-510 labeled with a NIR fluorescent dye MPA was developed, and its ability to target the CD36 protein, which is upregulated in glioma, was assessed. Fluorescent-labeled probes, conjugated to the CD36-targeting ligand abt-510, demonstrated high specificity and selectivity for CD36-positive tumor cells in vitro and tumor tissue in vivo. Biodistribution analysis of MPA-Pip-abt-510 revealed high tumor-specific accumulation in tumors, accompanied by minimal nonspecific uptake in background tissues, yielding a signal-to-noise ratio (SNR) of 6.6 ± 0.4 in a U87 subcutaneous glioma model 10 h postinjection. Meanwhile, quantitative analysis validated the high uptake of MPA-Pip-abt-510 in the U87 orthotopic tumor model, with a tumor-to-brain SNR of 5.4 ± 0.5, enabling the accurate identification of tumor tissue for surgical navigation. Moreover, pathological analysis of tumor and healthy brain tissues unveiled well-defined tumor boundaries, highlighting the capacity of the MPA-Pip-abt-510 probe to precisely visualize the CD36 protein at the molecular level. Given its rapid tumor-targeting abilities, durable retention, and accurate outlining of tumor boundaries, MPA-Pip-abt-510 emerges as a promising CD36-targeted fluorescence contrast agent and expands the toolbox of glioma fluorescent probes for surgical navigation.

摘要

尽管胶质瘤的治疗取得了进展,但由于其预后极差且复发率高,胶质瘤相关的死亡率仍然很高。利用临床批准的荧光探针5-氨基乙酰丙酸(5-ALA)的近红外(NIR)荧光成像技术,在促进胶质瘤切除可视化方面已崭露头角。然而,5-ALA的假阳性和假阴性结果降低了其在检测胶质瘤中的敏感性和特异性,从而阻碍了其在胶质瘤手术导航中的应用。在此,开发了一种用近红外荧光染料MPA标记的新型分子探针MPA-Pip-abt-510,并评估了其靶向胶质瘤中上调的CD36蛋白的能力。与靶向CD36的配体abt-510偶联的荧光标记探针在体外对CD36阳性肿瘤细胞以及在体内对肿瘤组织表现出高特异性和选择性。MPA-Pip-abt-510的生物分布分析显示,在肿瘤中具有高肿瘤特异性蓄积,同时背景组织中的非特异性摄取极少,在U87皮下胶质瘤模型中注射后10小时产生的信噪比(SNR)为6.6±0.4。同时,定量分析验证了MPA-Pip-abt-510在U87原位肿瘤模型中的高摄取,肿瘤与脑的SNR为5.4±0.5,能够准确识别肿瘤组织用于手术导航。此外,肿瘤和健康脑组织的病理分析揭示了清晰的肿瘤边界,突出了MPA-Pip-abt-510探针在分子水平精确可视化CD36蛋白的能力。鉴于其快速的肿瘤靶向能力、持久的滞留以及对肿瘤边界的精确勾勒,MPA-Pip-abt-510成为一种有前景的靶向CD36的荧光造影剂,并扩展了用于手术导航的胶质瘤荧光探针工具箱。

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