对PET成像应用的-52的化化学
James M Omweri1, Volkan Tekin2, Shefali Saini1
1Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35205, USA; Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Nuclear medicine and biology
|December 28, 2023
概括
-52 (52Mn) 由于其半衰期很长,因此对PET放射性药物具有前景. 研究人员发现DO3A和Oxo-DO3A是52Mn的有效化剂,可用于生物研究的稳定放射标记.
科学领域:
- 核医学就是核医学.
- 放射化学 放射化学是指辐射化学.
- 生物医学成像技术 生物医学成像技术
背景情况:
- -52 (52Mn) 正在引起人们对开发长寿命正子发射断层扫描 (PET) 放射性药物的兴趣.
- 它的有利性质包括5.6天的半衰期,低质子能量,以及适合标记宏分子的分支比.
- 这使得52Mn非常适合研究缓慢的生物过程.
研究的目的:
- 确定和评估适合-52的化剂.
- 为了建立对-52化剂复合物的温和放射性标记条件.
- 评估放射性标记的-52复合物的稳定性和体内行为.
主要方法:
- -52通过52Mn (NatCr(p,n)) 产生.
- 评估了各种化剂 (DOTA,DiAmsar,TETA,DO3A,NOTA,4'-Formylbenzo-15-crown-5,Oxo-DO3A,DFO) 的放射性标记效率. 这些化剂的化效率是:
- 在小鼠血清中进行了体外稳定性和在小鼠体内生物评估.
- 单晶X射线衍射用于Mn-Oxo-DO3A复合物的结构特征.
主要成果:
- 用12.5 MeV质子获得52Mn的185 ± 19 MBq的产生.
- 在测试条件下,NOTA,DO3A,DOTA和Oxo-DO3A的放射化学纯度高于96%.
- 氧-DO3A,DOTA和DO3A的放射性复合体在体外表现出长达5天的稳定性和独特的生物分布特征.
- 确定了Mn-Oxo-DO3A复合物的固态结构.
结论:
- DO3A和Oxo-DO3A是适合-52的化剂.
- 这些化剂在温和的条件下,在高摩尔活性下,便于放射性标记.
- 由此产生的-52复合物在体外和体内表现出极好的稳定性.
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