开发和首次对人体进行针对PSMA的PET标记剂的研究,这些标记剂具有改善的药理动力学特性
Haodong Hou1, Yuan Pan1, Yanzhi Wang1
1Key Laboratory for Experimental Teratology of the Ministry of Education and Research Center for Experimental Nuclear Medicine, School of Basic Medical Sciences, Shandong University, No. 44 Wenhua Xi Road, Jinan, 250012, Shandong, China.
European journal of nuclear medicine and molecular imaging
|April 29, 2024
概括
新的加-68 (Ga) 标记的标记物被开发用于改善前列腺癌成像. 标记物Ga-TWS02显示出高结合亲和力和有效的可视化损伤,尿路毒性降低.
科学领域:
- 放射化学和核医学 放射化学和核医学
- 在瘤学瘤学.
- 分子成像学分子成像学
背景情况:
- 新型放射性追踪剂的开发对于提高前列腺癌 (PCa) 的诊断准确性至关重要.
- 像[Ga]Ga-PSMA-617和[Ga]Ga-PSMA-11这样的现有痕迹剂在瘤与脏的比率和泌尿系统积累方面存在限制.
- 尽量减少对尿道系统的辐射毒性是开发新PCa成像剂的关键目标.
研究的目的:
- 为了合成和评估基于Ga-PSMA-617的Ga-标记的新型标记剂.
- 为了增加瘤与脏的比率并减少膀活动的积累.
- 为了最终尽量减少PCa患者尿道系统的辐射毒性.
主要方法:
- 通过引入oline,phenylalanine和decanoic acid组来增强脂友性,合成了四种新型的放射性追踪剂.
- 在LNCaP细胞上进行了体外结合亲和度测试 (和和竞争).
- 在体内研究包括代谢分析,正子发射断层扫描 (PET) /计算机断层扫描 (CT) 成像,以及在LNCaP瘤携带小鼠中的生物分布实验,随后进行了首次对人类的研究.
主要成果:
- 合成了四种具有高放射性化学纯度 (>95%) 和摩尔活性 (20.0-25.5 GBq/μmol) 的标记剂.
- 与参考标记剂相比,Ga-TWS02表现出较低的纳米分子结合亲和力 (Ki<10nM) 和优越的瘤与脏 (0.93) 和瘤与肌肉 (107.62) 比率.
- 首次在人体内进行的研究证实Ga-TWS02能够检测PCa病变,尿道系统积累减少,并有可能检测膀入侵.
结论:
- 结构修改成功调节了基于PSMA的标记物的结合亲和力和药理动力学特性.
- [68Ga]Ga-TWS02在PCa诊断方面表现出色,提供清晰的成像和降低毒性.
- 当与DOTA结合时,TWS02也适合与177Lu和225Ac的治疗应用,可能用于PCa治疗.
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