一种智能自动固定磁共振对比剂,用于延迟瘤成像在体内
Zheng Huang1, Yinxing Miao1, Chunmei Lu1
1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Chemistry and Biomedicine Innovation Center (ChemBIC) Nanjing University, Nanjing, 210023, China.
Angewandte Chemie (International ed. in English)
|October 29, 2025
概括
一种新型的酶响应型MRI对比剂,P-QM-Gd,与瘤细胞结合. 这种自我固定增强信号,并使小瘤的精确检测,改善早期癌症诊断.
科学领域:
- 生物医学成像技术 生物医学成像技术
- 纳米技术纳米技术
- 化学 化学 化学
背景情况:
- 提高磁共振成像 (MRI) 探针灵敏度对于瘤检测至关重要.
- 目前的小分子MRI探头面临着瘤特异性积累和探头冲洗的挑战.
研究的目的:
- 开发一种酶响应,自动固定小分子MRI探头,用于高灵敏度瘤成像.
- 为了增强瘤部位的探针保留,并改善MRI信号.
主要方法:
- 设计P-QM-Gd,一个由膜结合酸酶 (ALP) 激活的探针.
- 酶激活产生中间体,这些中间体将加多复合物共地结合到瘤细胞膜中.
- 在小鼠的皮下和正管瘤模型中评估了探针性能.
主要成果:
- 酶自动固定增加了纵向放松度 (r1) 从7.35到13.15mM-1s-1.1.
- P-QM-Gd证明了瘤的快速吸收,高效的共价标记和>60%的MR对比度增强.
- 能够精确可视化小瘤 (∼1.3毫米) 在注射后长达24小时.
结论:
- 通过酶自动化,P-QM-Gd克服了传统MRI探针的局限性.
- 为高灵敏度,高空间分辨率延迟瘤MRI提供了一个有希望的策略.
- 有效用于早期病变检测和改善癌症诊断.
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