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基于Gd-DOTA的高度惰性对比剂,具有性侧链,用于肝胆和血管磁共振成像

Weiyuan Xu^1,2, Xinhui Xiao³, Zheng Cai¹

¹Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China.

Journal of medicinal chemistry

|December 9, 2025

概括

新的加多 (Gd3+) 基对比剂 (GBCA) 为磁共振成像 (MRI) 提供了增强的稳定性. 这些新型药物对肝胆道和血管成像应用都很有前途.

科学领域:

医疗成像医学成像
放射化学放射化学是指辐射化学.
生物化学生物化学

背景情况:

基于加多 (Gd³⁺) 的对比剂 (GBCA) 对于磁共振成像 (MRI) 非常重要.
目前的GBCA面临限制,包括Gd³⁺泄漏风险和低于最佳的灵敏度.
Gd-DOTA具有很高的惰性,作为稳定性的基准.

研究的目的:

开发基于Gd³⁺的新型对比剂,以提高稳定性和灵敏度.
为增强MRI应用合成和评估Gd-DOTABA的脂性衍生物.
评估这些新药在肝胆和血管成像方面的潜力.

主要方法:

脂性部分 (3-phenylpropylamine和3,3-diphenylpropylamine) 与Gd-DOTABA结合,产生了Gd-L和Gd-L.
通过在酸性条件下测量分离半衰期来量化惰性.
在小鼠和子的体内研究分别评估了肝脏MRI性能和血液消除半衰期.
放松性测量是在人血清白蛋白 (HSA) 存在的情况下进行的.

主要成果:

Gd-L₁和Gd-L₂显示出显著增强的惰性,解离半衰期大约是Gd-DOTA.的四倍.
在小鼠中,Gd-L₁的肝脏MRI性能与Gd-BOPTA的肝脏MRI性能相当.
在子中,Gd-L₂显示了高放松性 (r₁) 14.8 mM^-1 s^-1与HSA,血液消除半衰期为~18 分钟.

结论:

新的基于Gd³⁺的对比剂,Gd-L₁和Gd-L₂,与现有剂相比,表现出优越的稳定性.
Gd-L₁是肝胆MRI的一个有希望的候选者.
由于其高放松性和有利的药理动力学特征,Gd-L显示出作为血管MRI有效剂的潜力.

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