68Ga/177Lu标记双等效剂用于向前列腺癌中缺氧和PSMA结合的目标
Yang Luo1, Wenbin Jin1, Ran Wang1
1Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Journal of medicinal chemistry
|July 29, 2024
概括
针对前列腺特异性膜抗原 (PSMA) 和瘤缺氧的新双价剂在癌症成像和治疗方面表现有前途. 这些药物表现出增强的瘤吸收和保留,特别是在低氧条件下,这表明改善了诊断和治疗潜力.
科学领域:
- 在瘤学瘤学.
- 放射化学 放射化学是指辐射化学.
- 分子成像学分子成像学
背景情况:
- 前列腺特异性膜抗原 (PSMA) 是前列腺癌诊断和治疗的验证标.
- 瘤缺氧是固体瘤的常见特征,影响治疗反应和耐药性.
- 胺醇 (NI) 衍生物可以选择性地被困在低氧细胞中,为低氧向成像和治疗提供了一种策略.
研究的目的:
- 设计和合成新的双价药剂,将低氧敏感的胺醇 (NI) 部分与PSMA向组结合起来.
- 评估这些标有-68 (Ga) 和-177 (Lu) 的双价剂的体外和体内性能,用于癌症成像和放射治疗.
主要方法:
- 合成含有NI和PSMA定位功能的双价化合物 (1-8).
- 配体的放射性标记为68Ga用于正子发射断层扫描 (PET) 和177Lu用于单光子发射计算机断层扫描 (SPECT) 和治疗.
- 在正常和缺氧条件下细胞吸收的体外评估.
- 在携带瘤的小鼠模型中进行体内PET/CT和SPECT/CT成像.
主要成果:
- 1-8的化合物已成功合成并被放射性标记.
- [68Ga]Ga-8在低氧下表现出明显更高的细胞积累,与正常氧相比,证实了低氧选择性捕获.
- 在体内,对[68Ga]Ga-8的PET/CT成像显示了高瘤吸收率 (SUVmax:10.68%ID/mL).
- 对[177Lu]Lu-8的SPECT/CT成像显示,在注射后的24小时和48小时内,瘤积累和保留非常好.
结论:
- 开发的双价剂 (GaGa/Lu-8) 有效地准PSMA和瘤缺氧.
- 对缺氧敏感的NI部分增强了瘤特异性保留,改善了成像和治疗潜力.
- Ga Ga/[177 Lu]Lu-8代表了对具有缺氧微环境的PSMA阳性瘤有前途的治疗药剂.
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