一种新型高 afinity 放射性连体的临床前评估 [99m Tc]Tc-BQ0413 向前列腺特异性膜抗原 (PSMA)
Ekaterina Bezverkhniaia1,2,3, Panagiotis Kanellopoulos1, Ayman Abouzayed1
1Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden.
International journal of molecular sciences
|December 23, 2023
概括
一个新的技术-99m标记分子,[99mTc]Tc-BQ0413,显示前列腺癌成像的希望. 它专门针对前列腺特异性膜抗原 (PSMA) 阳性瘤,在SPECT扫描中提供更好的可视化.
科学领域:
- 核医学是一种核医学.
- 放射性药物化学 放射性药物化学
- 在瘤学瘤学.
背景情况:
- 前列腺特异性膜抗原 (PSMA) 向放射性核素成像对于前列腺癌的分期至关重要.
- 之前的研究使用特定的链接结构优化了PSMA结合剂.
- 为了改进成像,正在开发新型无线电追踪器.
研究的目的:
- 为了评估新设计的分子[99mTc]Tc-BQ0413的成像特性,用于PSMA准成像.
- 在体外和体内评估[99mTc]Tc-BQ0413对表达PSMA的细胞的特异性和亲和力.
- 为了比较BQ0413与PSMA-11在阻断正常组织吸收中的有效性.
主要方法:
- 用Tc-99m对BQ0413进行合成和放射性标记.
- 在体外结合试验中使用PSMA转移的PC3-pip细胞来确定亲和力和特异性.
- 在PC3-pip瘤携带小鼠体内研究,以评估瘤吸收和生物分布.
- 使用未标记的BQ0413和PSMA-11来评估瘤与器官的比率的阻断研究.
主要成果:
- [99mTc]Tc-BQ0413证明了与高亲和度 (33 ± 15 pM) 的PC3-pip细胞的特定结合.
- 在PSMA阳性瘤中观察到显著的瘤吸收 (38±6%IA/g在3h),在PSMA阴性瘤中吸收最小.
- BQ0413和PSMA-11有效地阻断了正常组织的吸收,增加了瘤与器官的比率;BQ0413在抑制脏吸收方面更有效.
结论:
- [99mTc]Tc-BQ0413是PSMA阳性前列腺癌病变的SPECT成像的一个有前途的放射追踪剂.
- 该分子对PSMA具有很高的特异性和亲和力.
- BQ0413在减少背景活动和改善病变检测方面具有潜在的优势.
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