Provided are embodiments of a small molecule tracer for positron emission tomography (PET) imaging of the enzyme activity of PARP-1 that is responsible for DNA-damage sensing and critically involved in radiation therapy and some chemotherapy response mechanisms. These PARP-1 tracers are derivatives of nicotinamide adenine dinucleotide (NAD), which is the natural substrate for PARP-1. Provided are NAD derivatives that include a linker moiety to which may be attached a label moiety such as a PET detectable fluorine to generate a 6N-(triazo-PEG2-18F)-NAD. Especially advantageous for use in PET and MRI scanning detection systems is the attachment of a chelating agent that allows for the formation of a chelator-metal ion complex.
本发明提供了一种小分子示踪剂的实施方案,用于对
PARP-1 的酶活性进行正电子发射断层扫描(PET)成像,
PARP-1 负责 DNA 损伤感应,并严重参与放射治疗和某些化疗反应机制。这些
PARP-1 示踪剂是烟
酰胺腺嘌呤二
核苷酸(
NAD)的衍
生物,
NAD 是
PARP-1 的
天然底物。所提供的
NAD 衍
生物包括一个连接基团,该连接基团可连接一个标签基团,如 PET 可检测的
氟,从而生成 6N-(三
氮杂-P
EG2-18F)-
NAD。在 PET 和 MRI 扫描检测系统中使用时,特别有利的是附加
螯合剂,以形成
螯合剂-
金属离子复合物。